JP6762619B2 - Telescopic cylinder device - Google Patents

Description

The present invention relates to a telescopic cylinder device, and more specifically, the fitting portion fitted in the internal space of the cylinder portion is extended in a direction parallel to the first straight line with respect to the cylinder portion by pumping a driving fluid into the internal space. And / or related to a telescopic cylinder device that contracts.

Telescopic cylinder devices driven by a driving fluid have long been used in various fields. For example, in an elevator mechanism for raising and lowering an elevating box body for accommodating a transported object such as a person or luggage and transporting the transported object, a telescopic cylinder device is used to raise and lower the elevating box body.
FIG. 1 is a schematic perspective view showing a conventional elevator mechanism 101 (the elevator box 115 described later is at the lowest position), and FIG. 2 shows the telescopic cylinder device 113 in the elevator mechanism 101 shown in FIG. Partially omitted front view (in FIG. 1, the telescopic cylinder device 113 is viewed from the direction of arrow A parallel to the X axis, which will be described later. In addition, elements constituting the elevator mechanism 101 other than the telescopic cylinder device 113. Is omitted as appropriate.), And FIG. 3 is a partially omitted cross-sectional view of the telescopic cylinder device 113 shown in FIG. 1 (a cross section taken along a plane perpendicular to the X axis, which will be described later). .. Then, FIG. 4 is a schematic perspective view (shown from the same direction as in FIG. 1) showing the elevator mechanism 101 in a state where the elevating box body 115 is raised from the state of FIG. 1 and is in the highest position. FIG. 5 is a partially omitted front view showing the telescopic cylinder device 113 in the elevator mechanism 101 shown in FIG. 4 (in FIG. 4, the telescopic cylinder device 113 is viewed from the direction of arrow A parallel to the X axis, which will be described later. It is shown. Elements constituting the elevator mechanism 101 other than the telescopic cylinder device 113 are appropriately omitted. FIG. 6 is a partially omitted sectional view of the telescopic cylinder device 113 shown in FIG. 5 (described later). The cross section is shown in a plane perpendicular to the X-axis.) Further, FIG. 7 is an enlarged cross-sectional view in the circle C shown by the dotted line in FIGS. 3 and 6. The conventional elevator mechanism 101 will be described with reference to FIGS. 1 to 7. For ease of explanation and understanding, the X-axis, Y-axis, and Z-axis, which are three orthogonal axes, are used (here, the Z-axis is vertical), and the respective directions are indicated by arrows X in the figure. It is indicated by Y and Z.

The conventional elevator mechanism 101 has a base plate 121 formed of a flat plate-like member having sufficient strength having both main surfaces perpendicular to the Z axis, and one end (here, the upper surface) of the main surface 121a (here, the upper surface) of the base plate 121. A pair of guide rails 123 and 125 to which the lower end) is fixed, a box body support member 127 slidably supported by the pair of guide rails 123 and 125 in the Z-axis direction, and a transported object such as a person or luggage. The elevating box body 115 that accommodates the elevating box body 115, the connecting member 129 that connects the elevating box body 115 and the box body supporting member 127, and the cylinder support member 131 that is slidably supported in the Z-axis direction by the pair of guide rails 123 and 125. (In addition, in FIGS. 2 and 5, it is shown by a dotted line.) One end (here, the lower end) is fixed to one main surface 121a (here, the upper surface) of the base plate 121, and the other end (here, the upper end). Is provided with a telescopic cylinder device 113 fixed to the box body support member 127.
The pair of guide rails 123 and 125 are both arranged in the longitudinal direction parallel to the Z axis, and the cross-sectional shape of the plane perpendicular to the Z axis is in the shape of a "U" in katakana. The guide grooves 123a and 125a formed in a U-shape are formed in parallel from one end (lower end) to the other end (upper end) so as to face each other. Both ends of the box body support member 127 are slidably fitted into the guide grooves 123a and 125a in the Z-axis direction, so that the box body support member 127 is slidably attached (elevated and lowered) in the Z-axis direction. Similarly, both ends of the cylinder support member 131 are slidably fitted into the guide grooves 123a and 125a in the Z-axis direction, so that the cylinder support member 131 is slidably attached (elevated and lowered) in the Z-axis direction.

The telescopic cylinder device 113 functions as a first cylinder 151 and a second cylinder 152 (the second cylinder 152 functions as a piston with respect to the first cylinder 151) which is slidably fitted in the first cylinder 151 in the Z-axis direction. ), The shaft 153 (the shaft 153 functions as a piston with respect to the second cylinder 152) fitted in the second cylinder 152 so as to be slidable in the Z-axis direction, and the telescopic cylinder device 113 is attached to the cylinder support member 131. Cylinder mounting tool 135 to be mounted (The cylinder mounting tool 135 and the cylinder support member 131 are mounted by a mounting screw 132 which is a male screw. FIG. 7 shows a female screw 132h screwed with the mounting screw 132). , And have.

In the first cylinder 151, an inner peripheral surface (the inner peripheral surface is along the side surface of the right-cylinder) defines a right-cylinder-shaped internal space 151k having an axis included in a straight line L parallel to the Z-axis. It is formed of a hollow cylindrical member, and the cylindrical member is formed with a driving oil inlet 161 communicating with an internal space 151k. The lower end side of the first cylinder 151 is closed by the bottom plate member 151d, and the rod cover 181 described later is attached to the upper end side, forming a bottomless and uncovered shape. As will be described later, the driving oil inlet 161 is an inlet for pumping the driving oil for extending the telescopic cylinder device 113.

The second cylinder 152 is fitted inside the internal space 151k of the first cylinder 151 from the upper end of the first cylinder 151, and has a piston portion 152p having an outer peripheral surface that slides on the inner peripheral surface of the first cylinder 151, and a piston. A shaft portion 152s having one end (lower end) attached to the portion 152p is included.
The piston portion 152p as a whole has a right-cylinder shape in which the axis is included in the straight line L (the side surface of the right-cylinder portion forms the outer peripheral surface of the piston portion 152p, and the outer peripheral surface faces the inner peripheral surface of the first cylinder 151). The piston portion 152p communicates with the internal space 171 between the inner peripheral surface of the first cylinder 151 and the piston portion 152p and the internal space 173 between the inner peripheral surface of the shaft portion 152s and the outer surface of the shaft 153. A communication passage 175 is formed.
The shaft portion 152s is formed by a hollow cylindrical member defined by an inner peripheral surface (the inner peripheral surface is along the side surface of the right-sided cylinder) in a right-cylindrical internal space 152k having an axis included in the straight line L. The cylindrical member is formed and has an outer peripheral surface along the side surface of a right-sided cylinder having an axis included in the straight line L. The lower end side of the shaft portion 152s is closed by the piston portion 152p except for the communication passage 175, and the cylinder fitting 135 is attached to the upper end side.
The shaft portion 152s penetrates the rod cover 181 attached to the upper end of the first cylinder 151, and is connected to the inner peripheral surface of the rod cover 181 and the outer peripheral surface of the shaft portion 152s by the annular packing 187 attached to the rod cover 181. The shaft portion 152s is slidable in the Z-axis direction with respect to the rod cover 181 while the liquidtightness between them is maintained.

The shaft 153 is fitted in the internal space 152k of the second cylinder 152 from the upper end of the second cylinder 152, and one end is attached to the bearing portion 153p sliding on the inner peripheral surface of the shaft portion 152s and the bearing portion 153p. The shaft portion 153s and the like are included.
The bearing portion 153p as a whole has a rectangular shape in which the shaft is included in the straight line L (the side surface of the straight cylinder forms the outer peripheral surface of the bearing portion 153p, and the outer peripheral surface faces the inner peripheral surface of the shaft portion 152s). Since the bearing portion 153p is attached to the tip (lower end) of the shaft 153, the bearing portion 153p slides smoothly on the inner peripheral surface of the shaft portion 152s, so that the shaft 153 is smooth in the Z-axis direction with respect to the second cylinder 152. Can reciprocate to.
The shaft portion 153s has an outer peripheral surface along the side surface of a right circular cylinder having an axis included in the straight line L.

Such a shaft portion 153s penetrates a cylinder fitting 135 attached to the upper end of the second cylinder 152 (shaft portion 152s).
The cylinder attachment 135 has a main body portion in which a cylindrical portion 135a forming the upper portion of the cylinder attachment 135 and a quadrangular prism portion 135b forming the lower portion of the cylinder attachment 135 are integrally formed. Further, as shown in FIG. 7, the cylinder fitting 135 includes a slide bearing 136 made of synthetic resin, metal (for example, copper) or the like, an annular packing 137, an annular dust seal 138, and an O-ring 139. (The packing 137, the dust seal 138, and the O-ring 139 are all fixed to the main body portion, and are relative to the main body portion around a straight line L. It cannot rotate.).
The driving oil supplied to the driving oil inlet 161 for extending the telescopic cylinder device 113 fills the internal space 171 and the internal space 173 (the internal space 171 and the internal space 173 are communicated with each other by the communication passage 175). The part of the driving oil that has entered the internal space 173 fills the gap 173c (particularly see FIG. 7) between the inner peripheral surface of the shaft portion 152s and the outer peripheral surface of the shaft portion 153s, and is inside the cylinder fitting 135. Reach. The driving oil that reaches the inside of the cylinder fitting 135 lubricates the slide bearing 136 (supports the shaft portion 153s so as to be slidable in the Z-axis direction with respect to the cylinder fitting 135), but is sealed by the annular packing 137. By sealing between the outer peripheral surface of the shaft portion 153s and the inner peripheral surface of the main body portion (cylindrical portion 135a) so that the driving oil does not pass through the shaft portion 153s, the cylinder fitting 135 upper hole through which the shaft portion 153s penetrates is formed. The driving oil is prevented from leaking from the gap 135h1 between the shaft portion 153s (note that the annular dust seal 138 prevents dust and the like from entering the sliding bearing 136 direction from the gap 135h1. is there.). The shaft portion 153s is mounted on the cylinder while the liquid tightness between the inner peripheral surface of the cylinder fitting 135 and the outer peripheral surface of the shaft portion 153s is maintained by the annular packing 137 attached to the cylinder fitting 135 in this way. It is slidable in the Z-axis direction with respect to the tool 135.
Further, the shaft portion 152s and the cylinder fitting 135 are fixed to each other so as not to rotate, and among the driving oil that reaches the inside of the cylinder fitting 135, the outer peripheral surface of the shaft portion 152s and the inner peripheral surface of the cylinder fitting 135 Exudation between them is prevented by the annular O-ring 139.
As described above, the cylinder fitting 135 is attached to the cylinder support member 131 by the male screw mounting screw 132.
The seal structure of the driving oil (slip bearing 136, packing 137, dust seal 138, O-ring 139) has the same seal structure as the rod cover 181 (the above-mentioned annular packing 187 corresponds to the packing 137). The driving oil that fills the gap 173d between the inner peripheral surface of the first cylinder 151 and the outer peripheral surface of the shaft portion 152s is prevented from leaking.

In the telescopic cylinder device 113, the second cylinder 152 protrudes from the first cylinder 151 by pumping the driving oil from the extension hydraulic unit (not shown) for extending the telescopic cylinder device 113 to the driving oil inlet 161. At the same time, the shaft 153 protrudes from the second cylinder 152 (changes from FIGS. 1 to 4 to 6), so that the telescopic cylinder device 113 extends (the dimension in the Z-axis direction increases). Further, if the pressure of the driving oil supplied from the extension hydraulic unit (not shown) is reduced, the elevating box body 115, the connecting member 129, the box body support member 127, the cylinder support member 131, the second cylinder 152 and the shaft 153 The telescopic cylinder device 113 contracts due to its own weight (gravity) (changes from FIGS. 4 to 6 to 1 to 3).
Here, the pressure-fed driving oil acts only when the telescopic cylinder device 113 is extended (single-acting cylinder), but a double-acting cylinder that acts on both expansion and contraction of the telescopic cylinder device may be used.
When the telescopic cylinder device 113 expands and contracts in this way, the cylinder support member 131 is supported so as to be reciprocating in the Z-axis direction and non-rotatable around the straight line L. The tool 135 reciprocates in the Z-axis direction around the straight line L without rotation.

According to such an elevator mechanism 101, when the telescopic cylinder device 113 is extended, the box body support member 127 and the connecting member 129 are raised to raise the elevating box body 115 (FIGS. 4 to 6), and conversely, the telescopic cylinder is raised. When the device 113 contracts (FIGS. 1 to 3), the box body support member 127 and the connecting member 129 are lowered to lower the elevating box body 115. Therefore, the elevating box body 115 can be freely moved up and down to be used as an elevator. it can.
As the operation panel (not shown) for operating such an operation, various ones can be arranged and used. For example, by operating the operation panel arranged inside the elevating box 115, the telescopic cylinder device can be used. The elevating box body 115 may be moved up and down by expanding and contracting the 113, and the door (not shown) of the elevating box body 115 may be opened and closed.

Further, FIG. 8 is a front view showing a conventional telescopic cylinder device 513 different from the conventional telescopic cylinder device 113, and FIG. 9 is a cross-sectional view (a straight line described later) of the telescopic cylinder device 513 shown in FIG. The cross section by the plane including L is shown.). 10 is a front view showing the telescopic cylinder device 513 extended from the state of FIG. 8 (shown from the same position as in FIG. 8), and FIG. 11 is shown in FIG. It is a cross-sectional view of the telescopic cylinder device 513 shown (showing the cross section by the plane including the straight line L which will be described later). Further, FIG. 12 is an enlarged cross-sectional view in the circle C shown by the dotted line in FIG. 11, and FIG. 13 is an enlarged cross-sectional view in the circle E shown by the dotted line in FIG. The telescopic cylinder device 513 will be described with reference to FIGS. 8 to 13. For ease of explanation and understanding, the X-axis, Y-axis, and Z-axis, which are three orthogonal axes, are used (here, the Z-axis is vertical), and the respective directions are indicated by arrows Y and arrows in the drawing. It is indicated by Z (Note that the arrow X does not appear in the figure because FIGS. 8 to 13 show a plane perpendicular to the X axis).

In the telescopic cylinder device 513, the first cylinder 551 and the second cylinder 552 slidably fitted in the first cylinder 551 in the Z-axis direction (the second cylinder 552 functions as a piston with respect to the first cylinder 551). ), A shaft 553 fitted in the second cylinder 552 so as to be slidable in the Z-axis direction (the shaft 553 functions as a piston with respect to the second cylinder 552), and the telescopic cylinder device 513 are attached to the cylinder support member 131. Cylinder mounting tool 535 to be mounted (The cylinder mounting tool 535 and the cylinder support member 131 are mounted by a mounting screw that is a male screw. In addition, FIGS. 8, 10 and 12 show a female screw 532h screwed with the mounting screw. It has.) And.

The first cylinder 551 defines a right-cylinder-shaped internal space 551k having an axis included in a straight line L parallel to the Z-axis by an inner peripheral surface (the inner peripheral surface is along the side surface of the right-cylinder). It is formed of a hollow cylindrical member, and the cylindrical member is formed with a driving oil inlet 561 communicating with an internal space 551k. The lower end side of the first cylinder 551 is closed by the bottom plate member 551d, and the rod cover 581 described later is attached to the upper end side, forming a bottomless and uncovered shape. As will be described later, the driving oil inlet 561 is an inlet for pumping driving oil for extending the telescopic cylinder device 513.

The second cylinder 552 is fitted in the internal space 551k of the first cylinder 551 from the upper end of the first cylinder 551, and has a piston portion 552p having an outer peripheral surface sliding on the inner peripheral surface of the first cylinder 551 and a piston. It includes a shaft portion 552s having one end attached to the portion 552p.
The piston portion 552p as a whole has a right-cylinder shape (the side surface of the right-sided cylinder forms the outer peripheral surface of the piston portion 552p, and the outer peripheral surface faces the inner peripheral surface of the first cylinder 551). The piston portion 552p reciprocates in the Z-axis direction with respect to the first cylinder 551 in a state where the annular packing 552ps attached so as to go around the outer peripheral surface of the piston portion 552p is in contact with the inner peripheral surface of the first cylinder 551. Therefore, the liquidtightness between the outer peripheral surface of the piston portion 552p and the inner peripheral surface of the first cylinder 551 is maintained during the reciprocating motion.
The shaft portion 552s is formed by a hollow cylindrical member defined by an inner peripheral surface (the inner peripheral surface is along the side surface of the rectangular cylinder) in a rectangular cylinder-shaped internal space 552k having an axis included in the straight line L. The cylindrical member is formed and has an outer peripheral surface along the side surface of a right-sided cylinder having an axis included in the straight line L. The lower end side of the shaft portion 552s is closed by the piston portion 552p, and the cylinder attachment 535 described later is attached to the upper end side. Further, the internal space 572 between the outer peripheral surface of the shaft portion 552s and the inner peripheral surface of the first cylinder 551 includes the connected passages 552pc1 and 552pc2 formed in the piston portion 552p and the piston portion 552p above the connecting passages 552pc1 and 552pc2. It communicates with the lower end of the internal space 552k of the shaft portion 552s by the gap 552 bp formed between the outer peripheral surface and the inner peripheral surface of the first cylinder 551 (the communication passages 552 pc1, 552 pc2 and the gap 552 bp communicate with each other). are doing. The driving oil is injected into the internal space 552k and the internal space 572 in advance, and the driving oil can freely move between the internal space 552k and the internal space 572 via the communication passages 552pc1, 552pc2 and the gap 552ppb.
The shaft portion 552s penetrates the rod cover 581 attached to the upper end of the first cylinder 551, and the inner peripheral surface of the rod cover 581 and the outer peripheral surface of the shaft portion 552s are connected by the annular packing 587 attached to the rod cover 581. The rod cover 581 is slidable in the Z-axis direction while maintaining the liquidtightness between the rod covers.

The shaft 553 is fitted in the internal space 552k of the second cylinder 552 from the upper end of the second cylinder 552, and one end is attached to the bearing portion 553p sliding on the inner peripheral surface of the shaft portion 552s and the bearing portion 553p. The shaft portion 553s and the like are included.
The bearing portion 553p as a whole has a rectangular shape in which the shaft is included in the straight line L (the side surface of the straight cylinder forms the outer peripheral surface of the bearing portion 553p, and the outer peripheral surface faces the inner peripheral surface of the shaft portion 552s). Since the bearing portion 553p is attached to the tip (lower end) of the shaft 553, the bearing portion 553p slides smoothly on the inner peripheral surface of the shaft portion 552s, so that the shaft 553 is smooth in the Z-axis direction with respect to the second cylinder 552. Can reciprocate to.
The shaft portion 553s has an outer peripheral surface along the side surface of a straight cylinder having an axis included in the straight line L.

Such a shaft portion 553s penetrates a cylinder fitting 535 attached to the upper end of the second cylinder 552 (shaft portion 552s).
The cylinder mounting tool 535 has a main body portion in which a cylindrical portion 535a forming an upper portion of the cylinder mounting tool 535 and a square pillar portion 535b forming a lower portion of the cylinder mounting tool 535 are integrally formed. Further, as shown in FIG. 12, the cylinder fitting 535 includes a slide bearing 536 made of synthetic resin, metal (for example, copper) or the like, an annular packing 537, an annular dust seal 538, and an O-ring 539. (The packing 537, the dust seal 538, and the O-ring 539 are all fixed to the main body, and are relative to the main body around a straight line L. It cannot rotate.).
Then, a part of the driving oil existing in the internal space 552k fills the gap 573c (particularly see FIG. 12) between the inner peripheral surface of the shaft portion 552s and the outer peripheral surface of the shaft portion 553s, and reaches the inside of the cylinder fitting 535. The driving oil that reaches the inside of the cylinder fitting 535 lubricates the slide bearing 536 (supporting the shaft portion 553s that slides in the Z-axis direction with respect to the cylinder fitting 535), and is sealed by the annular packing 537 (packing). By sliding the 537 into the outer peripheral surface of the shaft portion 553s, the outer peripheral surface of the shaft portion 553s and the inner peripheral surface of the cylindrical portion 535a are sealed so that the driving oil does not pass through the shaft portion 553s. Prevents driving oil from leaking from the gap between the upper hole of the cylinder fitting 535 and the shaft portion 553s (Note that the annular dust seal 538 allows dust and dirt to enter the slide bearing 536 direction from the gap. It prevents this from happening.) The shaft portion 553s is mounted on the cylinder while the liquidtightness between the inner peripheral surface of the cylinder fixture 535 and the outer peripheral surface of the shaft portion 553s is maintained by the annular packing 537 attached to the cylinder fitting 535 in this way. It is slidable in the Z-axis direction with respect to the tool 535.
Further, the shaft portion 552s and the cylinder fitting 535 are fixed to each other so as not to rotate around a straight line L, and among the driving oil that has reached the inside of the cylinder fitting 535, the outer peripheral surface of the shaft portion 552s and the cylinder fitting 535 are fixed. Exuding from the inner surface is prevented by the annular O-ring 539.
As described above, the cylinder fitting 535 is attached to the cylinder support member 131 by a male screw mounting screw.
The seal structure of the driving oil (sliding bearing 536, packing 537, dust seal 538, O-ring 539) has the same sealing structure as the rod cover 581 (the above-mentioned annular packing 587 corresponds to the packing 537). The driving oil that fills the internal space 572 between the inner peripheral surface of the first cylinder 551 and the outer peripheral surface of the shaft portion 552s is prevented from leaking.
When the telescopic cylinder device 513 expands and contracts, the cylinder support member 131 is reciprocated in the Z-axis direction and is non-rotatably supported around the straight line L. Therefore, the cylinder fitting 535 attached to the cylinder support member 131 is supported. It reciprocates in the Z-axis direction around the straight line L without rotation.

The applicant of the present application has developed and applied for a patent on the telescopic cylinder device similar to the telescopic cylinder device 113 and 513 (for example, Patent Documents 1 to 14).

Japanese Unexamined Patent Publication No. 2012-67911 Japanese Unexamined Patent Publication No. 2011-107226 Japanese Unexamined Patent Publication No. 2004-218734 Japanese Unexamined Patent Publication No. 2004-218733 Japanese Unexamined Patent Publication No. 2004-218732 Japanese Unexamined Patent Publication No. 2004-204999 Japanese Unexamined Patent Publication No. 2004-204998 Japanese Unexamined Patent Publication No. 2003-206911 JP-A-2002-339915 Japanese Unexamined Patent Publication No. 2002-21349 Japanese Unexamined Patent Publication No. 2002-211887 Japanese Unexamined Patent Publication No. 10-141323 Japanese Unexamined Patent Publication No. 8-184302 Japanese Unexamined Patent Publication No. 7-237893

The telescopic cylinder devices 113 and 513 constituting the elevator mechanism 101 described with reference to FIGS. 1 to 13 include a cylinder portion (in the telescopic cylinder device 113, a second cylinder 152 and a cylinder attachment 135 are included. The telescopic cylinder device 513 includes two cylinders, one of which is composed of a second cylinder 552 and a cylinder fitting 535, and the other (2) is a first cylinder 551. The internal space of the telescopic cylinder device 113 (the internal space is 152k in the telescopic cylinder device 113. The telescopic cylinder device 513 includes 2 internal spaces, of which (1) is the inside. The space is 552k, and the other (2) is the internal space 551k. Note that (1) and (2) correspond to the above, and the same applies to the following in this paragraph). The fitted portion (the shaft 153 in the telescopic cylinder device 113. In the telescopic cylinder device 513, the fitting portion of 2 is included, of which (1) is the shaft 553 and the other (2) is the second cylinder. By pumping a driving fluid (driving oil in the telescopic cylinder devices 113 and 513) into the internal space of 552 and a cylinder attachment 535), a first straight line (straight line L) is sent to the cylinder portion. ) Is a telescopic cylinder device that expands and contracts in the direction parallel to). The telescopic cylinder devices 113 and 513 have a fitting portion having an outer peripheral surface forming a side surface portion of a straight cylinder having an axis existing on the first straight line (straight line L) (the telescopic cylinder is the shaft 153 in the telescopic cylinder device 113). In the device 513, (1) is a shaft 553, and (2) is configured to have a second cylinder 552 and a cylinder attachment 535) and a shaft existing on the first straight line (straight line L). The internal space (in the telescopic cylinder device 113, the internal space is 152k. In the telescopic cylinder device 513, (1) is the internal space 552k, and (2) is the internal space 551k. A cylinder having an inner peripheral surface that defines (there is)), and the fitting portion is internally fitted so as to be able to advance and retreat in a direction parallel to the first straight line (straight line L) while the outer peripheral surface of the fitting portion is surrounded by the inner peripheral surface. (The telescopic cylinder device 113 includes a second cylinder 152 and a cylinder fitting 135. In the telescopic cylinder device 513, (1) has a second cylinder 552 and a cylinder fitting 535. (2) is configured to have a first cylinder 551 and a rod cover 581) and one of the fitting portion and the cylinder portion (in the telescopic cylinder device 113, the second cylinder 152 and the cylinder). It is a tubular portion formed by having the attachment 135. In the telescopic cylinder device 513, (1) the tubular portion is formed by having the second cylinder 552 and the cylinder attachment 535, and (2). ) It is attached to a fitting portion having a second cylinder 552 and a cylinder fitting 535), and is attached to the other (in the telescopic cylinder device 113, the shaft 153) so as to surround the first straight line (straight line L). In the telescopic cylinder device 513, (1) the fitting portion is formed by having the shaft 553, and (2) the first cylinder 551 and the rod cover 581 are provided. An annular sliding member (in the telescopic cylinder device 113, an annular packing 137 and an annular dust seal 138. In the telescopic cylinder device 513, (1)). The annular packing 537 and the annular dust seal 538 (2) the annular packing 552 ps) and the annular packing 537 are displaced so as to have a component in either direction perpendicular to the first straight line (straight line L). Is restricted (here to have the component in either direction) It is attached to a support (cylinder support member 131 that is slidably (elevated) attached in the direction of the first straight line (straight line L)) that is also restricted from being displaced, and one of them (in the telescopic cylinder device 113, the first It is a cylinder portion composed of two cylinders 152 and a cylinder attachment 135. The telescopic cylinder device 513 is configured to have (1) a second cylinder 552 and a cylinder fitting 535, and (2) a second cylinder 552 and a cylinder fitting 535. It is an fitting part to be made. ) Is provided (in the telescopic cylinder device 113, it is a cylinder fitting 135. In the telescopic cylinder device 513, both (1) and (2) are cylinder fittings 535). is there.

Such an annular sliding member (in the telescopic cylinder device 113, it is an annular packing 137 and an annular dust seal 138. In the telescopic cylinder device 513, it is (1) an annular packing 537 and an annular dust seal 538. 2) The annular packing (552 ps) is important for sealing the driving fluid (driving oil in the telescopic cylinder devices 113 and 513) and for preventing or reducing the ingress of dust and dirt. Since the telescopic cylinder device expands and contracts and deteriorates due to wear and the like, it is necessary to replace the sliding member according to the deterioration situation. Such replacement work of the sliding member requires a work cost and causes a problem that the telescopic cylinder device cannot be used during the work time.
Therefore, in the present invention, "expansion and contraction in which the fitting portion fitted in the internal space of the cylinder portion is expanded and / or contracted in the direction parallel to the first straight line with respect to the cylinder portion by pumping the driving fluid into the internal space. A cylinder device having an fitting portion having an outer peripheral surface forming a side surface portion of a right circular cylinder having an axis existing on the first straight line and a side surface portion of the right cylinder having an axis existing on the first straight line to form the internal space. A cylinder portion having a specified inner peripheral surface and the fitting portion being internally fitted so as to be able to advance and retreat in a direction parallel to the first straight line while the outer peripheral surface of the fitting portion is surrounded by the inner peripheral surface, and the fitting portion and the cylinder portion. An annular sliding member that is attached to one of the two and slides with the other so as to surround the first straight line, and is restricted from being displaced so as to have a component in either direction perpendicular to the first straight line. An object of the present invention is to provide a telescopic cylinder device capable of reducing the deterioration rate of an annular sliding member in a telescopic cylinder device that is attached to a support and includes a fitting that supports one of them. To do. According to the telescopic cylinder device capable of reducing the deterioration rate, the number of replacement operations of the sliding member can be reduced.

The present inventors extend and / or extend the fitting portion internally fitted in the internal space of the tubular portion in a direction parallel to the first straight line with respect to the tubular portion by pumping a driving fluid into the internal space. Alternatively, it is a telescopic cylinder device that contracts, and has an fitting portion having an outer peripheral surface forming a side surface portion of a right cylinder having a shaft existing on the first straight line, and a side surface portion of the right cylinder having an axis existing on the first straight line. A cylindrical portion that has an inner peripheral surface that defines the internal space and that allows the fitting portion to advance and retreat in a direction parallel to the first straight line while the outer peripheral surface of the fitting portion is surrounded by the inner peripheral surface, and the fitting portion. Displaced so as to have an annular sliding member that is attached to one of the portion and the cylinder and slides with the other so as to surround the first straight line, and a component in either direction perpendicular to the first straight line. In a telescopic cylinder device, which is equipped with a fixture that is attached to a restricted support and supports one of them, an intensive study was conducted to reduce the deterioration of the annular sliding member. It has been found that the deterioration rate of the sliding member can be remarkably reduced by making one of the sliding members rotatably around the first straight line, and the present invention has been completed.

That is, in the telescopic cylinder device of the present invention (hereinafter, referred to as "the device"), the fitting portion fitted in the internal space of the tubular portion is pumped with a driving fluid into the internal space, so that the cylinder portion is first. A telescopic cylinder device that extends and / or contracts in a direction parallel to one straight line, and has an fitting portion having an outer peripheral surface forming a side surface portion of a straight cylinder having an axis existing on the first straight line, and an axis existing on the first straight line. It has an inner peripheral surface that defines the internal space, and the fitting portion can be advanced and retreated in a direction parallel to the first straight line while the outer peripheral surface of the fitting portion is surrounded by the inner peripheral surface. An annular sliding member that is attached to one of the fitting portion and the cylinder portion and slides with the other so as to surround the first straight line, and in either direction perpendicular to the first straight line. A telescopic cylinder device comprising a support that is mounted on a support that is restricted from being displaced to have the components of, and that rotatably supports one of the supports around a first straight line.

This device is a telescopic cylinder device that extends and / or contracts the fitting portion internally fitted in the internal space of the cylinder portion in a direction parallel to the first straight line with respect to the cylinder portion by pumping a driving fluid into the internal space. is there.
As the driving fluid in this device, various fluids can be used and are not limited in any way, and examples thereof include liquids such as oil and water, and gases such as air and nitrogen gas. , It is preferable that the fitting portion fitted in the internal space of the tubular portion is supplied by a pressure or a flow rate capable of expanding and / or contracting the tubular portion to a desired degree.
Further, the present device may be a "single-acting cylinder" such as one in which the fitting portion internally fitted in the internal space of the cylinder portion is only expanded or contracted by the driving fluid with respect to the cylinder portion. It may be a "double-acting cylinder" that is both expanded and contracted by a driving fluid.

This device includes a fitting portion, a cylinder portion, a sliding member, and a fixture.
The fitting portion has an outer peripheral surface. The outer peripheral surface forms a side surface portion of the right-sided cylinder, and the axis of the right-sided cylinder is on the first straight line.
The tubular portion has an internal space into which the fitting portion is fitted, and the fitting portion is internally fitted into the internal space so as to be able to advance and retreat in a direction parallel to the first straight line. The tubular portion has an inner peripheral surface that defines the internal space, and the inner peripheral surface surrounds the outer peripheral surface of the fitting portion that is fitted in the internal space. The inner peripheral surface forms a side surface portion of the right cylinder, and the axis of the right cylinder lies on the first straight line.
The sliding member is attached to one of the fitting portion and the tubular portion, and the other (if the fitting portion is the one, the tubular portion is the other, and the tubular portion is the one) so as to surround the first straight line. The fitting portion slides on the other side).
The fixture is attached to a support and one of them is rotatably (including rotating) around a first straight line. The support is restricted from being displaced to have a component in either direction perpendicular to the first straight line, whereby one of them is oriented in either direction perpendicular to the first straight line. Although it is restricted to be displaced to have the component of (the fixture is attached directly or indirectly to one of them (another member is interposed between the fixture and the other)), the first. It is rotatable around one straight line.
According to this device, one of the fitting portion and the tubular portion to which the sliding member is attached is restricted to be displaced so as to have a component in either direction perpendicular to the first straight line. Since it is rotatable around the first straight line, the annular sliding member that slides with the other so as to surround the first straight line rotates with respect to the other to form the annular sliding member. It prevents or reduces a part of the sliding member from being greatly worn or deformed, and reduces the deterioration rate of the annular sliding member.

In this device, one of the cylinders is a cylinder, the fitting portion includes a rod-shaped shaft portion extending along a first straight line, and the cylinder portion is a cylinder body into which the base end side of the shaft portion is fitted. A shaft that includes a rod cover body that has a through hole through which the shaft portion penetrates and is non-rotatably attached to one end of the cylinder body around the first straight line, and a sliding member penetrates the through hole. The rod cover attachment portion is attached to the rod cover main body so as to go around the outer peripheral surface of the portion, and the fixture is rotatably attached around the first straight line with respect to the rod cover main body, and the rod cover attachment portion attached to the support is It may be configured to include (hereinafter referred to as "one-sided cylinder unit main device").
By doing so, one of the above to which the sliding member is attached is a tubular portion, and the fitting portion includes a rod-shaped shaft portion extending along the first straight line. The cylinder portion includes a cylinder body into which the base end side of the shaft portion is fitted, and a rod cover body that is non-rotatably attached to one end of the cylinder body around a first straight line. It has a through hole through which the shaft portion penetrates. The sliding member is attached to the rod cover body so as to go around the outer peripheral surface of the shaft portion penetrating the through hole of the rod cover body. Then, the attachment includes a rod cover attachment portion to be attached to the support, and the rod cover attachment portion is rotatably attached around the first straight line with respect to the rod cover main body.
As a result, the rod cover main body is rotatable around the first straight line with respect to the rod cover mounting portion attached to the support, so that the rod cover main body goes around the outer peripheral surface of the shaft portion penetrating the through hole of the rod cover main body. As described above, the sliding member attached to the rod cover body can also rotate around the first straight line, and by rotating with respect to the shaft portion (which constitutes the other fitting portion), the annular sliding It is possible to prevent or reduce a part of the member from being worn or deformed, and to reduce the deterioration rate of the annular sliding member.

In this device, one of the fitting portions is a fitting portion, and the fitting portion has a piston portion having the outer peripheral surface that is in sliding contact with the inner peripheral surface of the tubular portion, and a rod-shaped portion that is attached to the piston portion and extends along a first straight line. A device including a shaft portion, a sliding member is attached to the piston portion so as to go around the outer peripheral surface of the piston portion, and a fixture is attached to the shaft portion (hereinafter referred to as "one-sided fitting portion main device"). .) May be.
By doing so, the one side to which the sliding member is attached is the fitting portion, and the fitting portion includes the piston portion and the rod-shaped shaft portion. The piston portion has the outer peripheral surface that is in sliding contact with the inner peripheral surface of the tubular portion, and a sliding member is attached to the piston portion. The shaft portion is attached to the piston portion and has a rod-like shape extending along a first straight line. Then, the sliding member is attached to the piston portion so as to go around the outer peripheral surface of the piston portion, and the fixture is attached to the shaft portion.
As a result, since the shaft portion is rotatable around the first straight line with respect to the support, the sliding member attached to the piston portion so as to go around the outer peripheral surface of the piston portion attached to the shaft portion is also available. It can rotate around the first straight line, and by rotating with respect to the tubular portion (the other), it is possible to prevent or reduce a part of the annular sliding member from being worn or deformed, and the annular sliding member. Reduces the rate of deterioration of moving members.

In this device, the first part, the second part that fits the first part in the direction parallel to the first straight line, and the second part that fits the second part in the direction parallel to the first straight line. It can also be configured as a telescopic cylinder device (hereinafter referred to as "three-part configuration present device") including a portion. That is, the three-part configuration apparatus has a first portion having an outer peripheral surface forming a side surface portion of a straight cylinder having an axis existing on the first straight line, and a side surface portion of the right cylinder having an axis existing on the first straight line. It has an inner peripheral surface that defines a second internal space, and an outer peripheral surface that forms a side surface portion of a right circular cylinder having an axis existing on a first straight line, and the inner peripheral surface surrounds the outer peripheral surface of the first portion. In this state, the first part is fitted into the second internal space so that it can move forward and backward in the direction parallel to the first straight line, and the side surface part of a right cylinder having an axis existing on the first straight line is formed. The second portion has an inner peripheral surface that defines the above, and the second portion is fitted into the third internal space so as to be able to advance and retreat in a direction parallel to the first straight line while the outer peripheral surface of the second portion is surrounded by the inner peripheral surface. The first part constitutes the fitting portion of the first apparatus, the second portion constitutes the cylindrical portion of the first apparatus, and / or the fitting portion of the second apparatus. The second part constitutes, and the third part constitutes the tubular portion of the second apparatus.
The first portion has an outer peripheral surface forming a side surface portion of a right circular cylinder having an axis existing on the first straight line. The second portion has an inner peripheral surface and an outer peripheral surface that form both side surface portions of a right circular cylinder having an axis existing on the first straight line (of course, the inner peripheral surface is the radius of the right cylinder along the side surface portion). Defines a second internal space in which the outer peripheral surface is smaller than the radius of the right cylinder along the side surface portion) and the inner peripheral surface is the internal space of the second portion. Then, in the second portion, the first portion is fitted in the second internal space so as to be able to advance and retreat in the direction parallel to the first straight line, and in the fitted state, the outer peripheral surface of the first portion is fitted in the second portion. The inner peripheral surface surrounds it. The third portion has an inner peripheral surface forming a side surface portion of a straight cylinder having an axis existing on the first straight line, and the inner peripheral surface defines a third internal space which is an internal space of the third portion. Then, in the third portion, the second portion is fitted in the third internal space so as to be able to advance and retreat in the direction parallel to the first straight line, and in the fitted state, the outer peripheral surface of the second portion is fitted in the third portion. The inner peripheral surface surrounds it. In the telescopic cylinder device including the first portion, the second portion, and the third portion, a) the first portion constitutes the fitting portion of the first present device, and the tubular portion of the first present device is the second portion. Can be configured, b) the fitting portion of the second apparatus can be configured by the second portion, the cylinder portion of the second apparatus can be configured by the third portion, and c) the first The first part constitutes the fitting part of the present device, the second part constitutes the cylinder part of the first device, and the second part constitutes the fitting part of the second device, and the second book. The third portion can form the cylinder portion of the device. As described above, in the three-part configuration apparatus, the deterioration rate of the annular sliding member can be reduced in the multi-stage telescopic cylinder device including the first portion, the second portion, and the third portion.
Three-part configuration In this device, other than the three parts of the first part, the second part, and the third part, such as the fourth part in which the third part is fitted so as to be able to advance and retreat in the direction parallel to the first straight line. If a natural number of 3 or more is M, the first component and the second component in which the first component and the first component are fitted so as to be able to advance and retreat in a direction parallel to the first straight line may be included. And the third component that fits the second component in the direction parallel to the first straight line, and ... The third (M-1) component can be moved in and out in the direction parallel to the first straight line. It can be configured as a telescopic cylinder device including a first M component to be fitted (however, the first component has an outer peripheral surface forming a side surface portion of a straight cylinder having an axis existing on a first straight line. The N component (where N is a natural number of 2 or more and (M-1) or less) is a side surface of a right circular cylinder having an axis existing on the first straight line, and an inner peripheral surface that defines the Nth internal space. It has an outer peripheral surface forming a side surface portion of a right circular cylinder having an axis existing on a first straight line, and the outer peripheral surface of the (N-1) component portion is surrounded by the inner peripheral surface. 1) The constituent part is fitted in the Nth internal space so as to be able to advance and retreat in a direction parallel to the first straight line. It has an inner peripheral surface that defines the above, and the outer peripheral surface of the first (M-1) component can be moved forward and backward in a direction parallel to the first straight line while the inner peripheral surface surrounds the inner peripheral surface. It fits inside the Mth internal space.) Three-part configuration including M components from the first component to the M component In this device, if V is a natural number of 1 or more (M-2) or less, the V component will be The first part, the first (V + 1) component can be the second part, the second (V + 1) component can be the second part, and the second (V + 2) component can be the third part. Further, in the three-part configuration device including the M components from the first component to the M component, other devices different from the first device and / or the second device are used. The device may be included (in this case, a plurality of separate fixtures may be provided).

Three-part configuration In this device, the attachment in the first device or the attachment in the second device is attached to the second part (hereinafter referred to as "second part attachment device"). You may.
The fixture rotatably supports the one to which the sliding member is attached around the first straight line, and the rotation of the one causes a part of the annular sliding member to wear. It successfully prevents or reduces deformation and the like, and reduces the deterioration rate of the annular sliding member. Therefore, one of the above is rotatable, but the second portion of the three-part configuration apparatus is located between the first portion and the third portion, and can be easily rotated. Therefore (for example, in the case where the first part is fixed to the foundation part and the third part is fixed to the elevating object, those attached to rotate the first part and the third part (described above). In the example of, it is necessary to make these rotatable with respect to the foundation part and the elevating object), but the second part does not need to do so), the fixture in the first device or the second device. By attaching the attachment tool in the above to the second portion, one of the above can be easily rotated.

Second part fitting In this device, the first part constitutes the fitting portion of the first device, the second part constitutes the tubular portion of the first device, and the second device is fitted. The portion may be composed of the second portion, and the tubular portion of the second apparatus may be composed of the third portion (hereinafter, referred to as “second portion tubular portion fitting portion main device”).
Second part attachments for the first device and the second device When the device configures the device, the second portion configures the tubular portion of the first device and the fitting portion of the second device. As a result (the first portion constitutes the fitting portion of the first apparatus, and the third portion constitutes the tubular portion of the second apparatus), and the fitting portion is interposed between the first portion and the second portion. A part of the sliding member attached to the second part and the sliding member attached to the second part interposed between the second part and the third part may be worn or deformed. It can be successfully prevented or reduced and the rate of deterioration of the annular sliding member can be reduced.

In the second partial tubular portion fitting portion main device, the first present device may be the one-sided tubular portion main device, and the second present device may be the one-side fitting portion main device.
In the first apparatus, one of them is a cylinder portion (second portion), and the fitting portion (first portion) includes a rod-shaped shaft portion extending along a first straight line, and the cylinder portion (first portion). (2 parts) are a cylinder body into which the base end side of the shaft portion is fitted, and a rod cover body having a through hole through which the shaft portion penetrates and being non-rotatably attached to one end of the cylinder body around the first straight line. The sliding member is attached to the rod cover body so as to go around the outer peripheral surface of the shaft portion penetrating the through hole, and the fixture is rotated around the first straight line with respect to the rod cover body. It is configured to include a rod cover attachment portion that is movably attached and attached to the support. Then, in the second apparatus, one of the fitting portions (second portion) is the fitting portion (second portion), and the fitting portion (second portion) is in sliding contact with the inner peripheral surface of the tubular portion (third portion). A piston portion having a piston portion and a rod-shaped shaft portion attached to the piston portion and extending along a first straight line are included, and a sliding member is attached to the piston portion so as to go around the outer peripheral surface of the piston portion. The fixture is attached to the shaft portion. In such a device, the second portion can constitute the one in the first device and the one in the second device.

Second Part Attachment In the present device, the attachment of the first device and the attachment of the second device may be one attached to the second part.
Second part fittings for the first device and the second device When the device configures the device, the mounting tools for the first device and the mounting tools for the second device are in the second part. Since it is not necessary to separately form the first fixture of the present device and the second fixture of the present device by using the attached one, the second partial fixture of the present device is simplified. In addition to being easily configured, when the second portion moves up and down, the mass associated with the raising and lowering can be reduced, and energy consumption can be reduced.

It is a schematic perspective view which shows the conventional elevator mechanism. It is a partially omitted front view which shows the part including the telescopic cylinder device in the elevator mechanism shown in FIG. It is a partially omitted sectional view of the telescopic cylinder device shown in FIG. It is a schematic perspective view which shows the elevator mechanism in the state which the elevating box body is raised from the state of FIG. 1 and is in the highest position. It is a partially omitted front view which shows the part including the telescopic cylinder device in the elevator mechanism shown in FIG. It is a partially omitted sectional view of the telescopic cylinder device shown in FIG. 3 is an enlarged cross-sectional view taken along the circle C shown by the dotted line in FIGS. 3 and 6. It is a front view which shows another conventional telescopic cylinder device. It is sectional drawing of the telescopic cylinder apparatus shown in FIG. It is a front view which shows the telescopic cylinder device in the extended state from the state of FIG. It is sectional drawing of the telescopic cylinder apparatus shown in FIG. 11 is an enlarged cross-sectional view taken along the circle C shown by the dotted line in FIG. 11 is an enlarged cross-sectional view taken along the circle E shown by the dotted line in FIG. It is a partially omitted front view which shows the telescopic cylinder apparatus (this apparatus) which concerns on 1st Embodiment of this invention. It is a partially omitted sectional view of this apparatus shown in FIG. It is a partially omitted front view which shows the apparatus in the extended state from the state of FIG. It is a partially omitted sectional view of this apparatus shown in FIG. 15 is an enlarged cross-sectional view taken along the circle D shown by the dotted line in FIGS. 15 and 17. It is a front view which shows the telescopic cylinder apparatus (this apparatus) which concerns on 2nd Embodiment of this invention. It is sectional drawing of this apparatus shown in FIG. It is a front view which shows the apparatus in the extended state from the state of FIG. It is sectional drawing of this apparatus shown in FIG. FIG. 22 is an enlarged cross-sectional view taken along the circle E shown by the dotted line in FIG. FIG. 22 is an enlarged cross-sectional view taken along the circle F shown by the dotted line in FIG. It is a front view which shows the telescopic cylinder apparatus (this apparatus) which concerns on 3rd Embodiment of this invention. It is sectional drawing of this apparatus shown in FIG. It is a front view which shows the apparatus in the extended state from the state of FIG. It is sectional drawing of this apparatus shown in FIG. 27. FIG. 28 is an enlarged cross-sectional view taken along the circle D shown by the dotted line in FIG. 28. FIG. 28 is an enlarged cross-sectional view taken along the circle E shown by the dotted line in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, these do not limit the present invention in any way.

(First Embodiment)
FIG. 14 is a partially omitted front view showing the telescopic cylinder device (this device) 13 according to the first embodiment of the present invention (viewed from the same direction as FIG. 2 in the conventional telescopic cylinder device 113). .), And FIG. 15 is a partially omitted cross-sectional view of the telescopic cylinder device 13 shown in FIG. 14 (showing a cross section in a plane including a straight line L described later). FIG. 16 is a partially omitted front view (shown from the same position as in FIG. 14) showing the telescopic cylinder device 13 in a state of being extended from the state of FIG. 14, and FIG. 17 is shown in FIG. FIG. 16 is a partially omitted cross-sectional view of the telescopic cylinder device 13 shown in FIG. 16 (showing a cross section in a plane including a straight line L described later). Further, FIG. 18 is an enlarged cross-sectional view in the circle D shown by the dotted line in FIGS. 15 and 17. A telescopic cylinder device (this device) 13 composed of a single-acting cylinder will be described with reference to FIGS. 14 to 18. For ease of explanation and understanding, the X-axis, Y-axis, and Z-axis, which are three orthogonal axes, are used (here, the Z-axis is vertical), and the respective directions are indicated by arrows Y and arrows in the drawing. It is indicated by Z (Note that since FIGS. 14 to 18 show a plane perpendicular to the X axis, the arrow X does not appear in the figure).

The telescopic cylinder device (this device) 13 can be used in place of the conventional telescopic cylinder device 113, and here, the telescopic cylinder device 113 included in the conventional elevator mechanism 101 shown in FIGS. 1 to 7 An elevator device (hereinafter referred to as "this elevator device") is configured by using the telescopic cylinder device 13 instead.
The device 13 is the same as the telescopic cylinder device 113, except that the cylinder fitting 135 of the telescopic cylinder device 113 is the cylinder fitting 35. Therefore, in FIGS. 14 to 18, the same elements as the elements of the telescopic cylinder device 113 are given the same reference numbers as those used in the telescopic cylinder device 113, and the duplicate description will be omitted.

Also in the telescopic cylinder device 13, the driving oil is pumped from a hydraulic unit (not shown) to the driving oil inlet 161 provided near the lower end of the first cylinder 151, so that the inner surface of the first cylinder 151 and the outer surface of the second cylinder 152 can be connected to each other. The internal space 171 between them and the internal space 173 between the inner surface of the second cylinder 152 and the outer surface of the shaft 153 are filled (the internal space 171 and the internal space 173 are communicated with each other by a communication passage 175). The telescopic cylinder device 13 can be extended by projecting the second cylinder 152 with respect to the cylinder 151 and projecting the shaft 153 with respect to the second cylinder 152 (changed from FIGS. 14 and 15 to 16 and 17). Yes (the dimensions in the Z-axis direction increase). Further, if the pressure of the driving oil supplied from the hydraulic unit is reduced, the weight (gravity) of the elevating box body 115, the connecting member 129, the box body support member 127, the cylinder support member 131, the second cylinder 152, and the shaft 153. ) Shrinks the telescopic cylinder device 13 (changes from FIGS. 16 and 17 to 14 and 15).

The cylinder fitting 35 is a straight line L including a cylindrical portion 35a forming the upper portion of the cylinder fitting 35 and a quadrangular prism portion 35b forming the lower portion of the cylinder fitting 35 including a right-cylindrical shaft formed by the shaft portion 153s. It has a main body that is rotatably attached around the. Further, as shown in FIG. 18, the cylindrical portion 35a of the cylinder fitting 35 includes a sliding bearing 36 (similar to the sliding bearing 136) made of synthetic resin, metal (for example, copper) or the like, and an annular packing. 37 (similar to packing 137), annular dust seal 38 (similar to dust seal 138), and O-ring 39 (similar to O-ring 139) are provided inside the cylindrical portion 35a (similar to packing 137). The packing 37, the dust seal 38, and the O-ring 39 are all fixed to the cylindrical portion 35a and are relatively non-rotatable with respect to the cylindrical portion 35a around the straight line L).
The quadrangular prism portion 35b is internally fitted with a cylindrical portion 35a, and the cylindrical portion 35a is a straight line L with respect to the quadrangular prism portion 35b by a bearing 34 arranged between the quadrangular prism portion 35b and the cylindrical portion 35a. It is supported around it so that it can rotate smoothly in the forward and reverse directions.
The quadrangular prism portion 35b is attached to the cylinder support member 131 by a mounting screw that is a male screw (the quadrangular prism portion 35b is formed with a female screw 35bh that is screwed with the mounting screw).
When the telescopic cylinder device 13 expands and contracts, the quadrangular prism portion 35b fixed to the cylinder support member 131 reciprocates in the Z-axis direction around the straight line L without rotation, but the cylindrical portion 35a reciprocates around the straight line L. While freely rotating, it reciprocates in the Z-axis direction together with the quadrangular prism portion 35b.

A part of the driving oil supplied to the driving oil inlet 161 in the present device 13 and has entered the internal space 173 has a gap 173c (particularly see FIG. 18) between the inner peripheral surface of the shaft portion 152s and the outer peripheral surface of the shaft portion 153s. It fills and reaches the inside of the cylinder fitting 35 (cylindrical portion 35a).
The driving oil that reaches the inside of the cylinder fitting 35 (cylindrical portion 35a) lubricates the slide bearing 36 (which supports the shaft portion 153s that slides in the Z-axis direction with respect to the cylinder fitting 35), but is an annular packing. Cylinder mounting through which the shaft portion 153s penetrates by being sealed by 37 (sealing between the outer surface of the shaft portion 153s and the inner surface of the cylinder fitting 35 (cylindrical portion 35a) so that driving oil does not pass through). It prevents the driving oil from leaking from the gap 35h1 between the upper hole of the tool 35 and the shaft portion 153s (Note that the annular dust seal 38 allows dust, dust, etc. to enter from the gap 35h1 in the direction of the slide bearing 36. It is to prevent.).
Further, the shaft portion 152s and the cylindrical portion 35a are fixed to each other so as not to rotate around a straight line L, and among the driving oils that reach the inside of the cylindrical portion 35a, the outer peripheral surface of the shaft portion 152s and the inner surface of the cylindrical portion 35a. Exudation between them is prevented by the annular O-ring 39.
The drive oil seal structure (slip bearing 36, packing 37, dust seal 38, O-ring 39) also has a rod cover 181 and includes an inner surface of the first cylinder 151 and an outer peripheral surface (side surface) of the shaft portion 152s. It prevents the driving oil that fills the gap 173d between the two and the vehicle from leaking out.

In such a device 13, as described above, when the device 13 expands and contracts, the cylindrical portion 35a reciprocates in the Z-axis direction together with the square pillar portion 35b while freely rotating around the straight line L. Therefore, since the rotation position of the annular packing 37 with respect to the shaft portion 153s (the position of the packing 37 around the straight line L when viewed from the shaft portion 153s) changes, uneven wear of the packing 37 can be effectively prevented. Can be done. As a result, it is possible to effectively prevent or reduce the leakage of driving oil from the gap 35h1 caused by uneven wear of the packing 37 in the apparatus 13.

As described above, the present device 13 has an fitting portion fitted in the internal space (internal space 152k) of the cylinder portion (composed of including the second cylinder 152 and the cylindrical portion 35a of the cylinder fitting 35). By pumping the driving fluid (here, the driving oil) into the internal space (internal space 152k), the cylinder portion (the second cylinder 152 and the cylindrical portion 35a) is subjected to the second (composed including the shaft 153). A telescopic cylinder device that extends and / or contracts (extends here) in a direction parallel to one straight line (straight line L), and is an outer peripheral surface forming a side surface portion of a straight cylinder having an axis existing on the first straight line (straight line L). The fitting portion (shaft 153) and the fitting portion having an inner peripheral surface that forms a side surface portion of a straight cylinder having an axis existing on the first straight line (straight line L) and defines the internal space (internal space 152k). With the outer peripheral surface of (shaft 153) surrounded by the inner peripheral surface, the fitting portion (shaft 153) is internally fitted so as to be able to advance and retreat in a direction parallel to the first straight line (straight line L) (with the second cylinder 152). It is attached to one of the cylindrical portion 35a), the fitting portion (shaft 153), and the tubular portion (second cylinder 152 and cylindrical portion 35a) (here, the tubular portion (second cylinder 152 and cylindrical portion 35a)), and the first An annular sliding member (here, an annular packing 37 and an annular dust seal 38) that slides with the other (here, the fitting portion (shaft 153)) so as to surround the straight line (straight line L), and a first straight line (straight line L). ) To a support (cylinder support member 131) that is restricted from being displaced to have a component in either direction (here, it is also restricted to have a component in any direction). It is provided with an attachment (here, a square pillar portion 35b) that is attached and rotatably supports one of them (cylinder portion (second cylinder 152 and cylindrical portion 35a)) around a first straight line (straight line L). It is a telescopic cylinder device.

In the present device 13, one of the cylinders (the second cylinder 152 and the cylindrical portion 35a) is a rod-shaped shaft portion (shaft portion) in which the fitting portion (shaft 153) extends along the first straight line (straight line L). 153s), and the cylinder part (second cylinder 152 and cylindrical part 35a) includes the cylinder body (shaft part 152s) into which the base end side of the shaft part (shaft part 153s) is fitted, and the shaft part (shaft part 153s). ) Is included at one end of the cylinder body (shaft portion 152s) through which the rod cover body (cylindrical portion 35a) is non-rotatably attached around the first straight line (straight line L). , The sliding member (annular packing 37, annular dust seal 38) is attached to the rod cover main body (cylindrical portion 35a) so as to go around the outer peripheral surface of the shaft portion (shaft portion 153s) penetrating the through hole. The tool (square pillar portion 35b) is rotatably attached to the rod cover body (cylindrical portion 35a) around the first straight line (straight line L), and is attached to the support (cylinder support member 131). It is configured to include a rod cover mounting portion (square column portion 35b).

In the present device 13, a first portion (shaft 153) having an outer peripheral surface forming a side surface portion of a right cylinder having an axis existing on the first straight line (straight line L) and an axis existing on the first straight line (straight line L). An inner peripheral surface that forms a side surface portion of a right-sided cylinder having a The second inner surface is capable of advancing and retreating the first portion (shaft 153) in a direction parallel to the first straight line (straight line L) while the inner peripheral surface of the first portion (shaft 153) is surrounded by the inner peripheral surface. A third internal space (second cylinder 152 and cylindrical portion 35a) that fits in the space (internal space 152k) and a side surface portion of a right cylinder having an axis existing on the first straight line (straight line L). It has an inner peripheral surface that defines the internal space 151k), and the outer peripheral surface of the second portion (second cylinder 152 and cylindrical portion 35a) is surrounded by the inner peripheral surface, and the second portion (second cylinder 152 and A third portion (first cylinder 151 and rod cover 181) that fits the cylindrical portion 35a) into the third internal space (internal space 151k) so as to be able to advance and retreat in the direction parallel to the first straight line (straight line L) is provided. The first portion (shaft 153) constitutes the fitting portion (shaft 153) of the first apparatus, and the tubular portion (second cylinder 152 and cylindrical portion 35a) of the first apparatus is formed by the second portion (second cylinder). It is a telescopic cylinder device composed of 152 and a cylindrical portion 35a).
Then, in the present device 13, the attachment (square pillar portion 35b) in the first present device is attached to the second portion (second cylinder 152 and cylindrical portion 35a).

(Second Embodiment)
FIG. 19 is a front view showing a telescopic cylinder device (this device) 213 according to a second embodiment of the present invention, and FIG. 20 is a cross-sectional view (a straight line L described later) of the present device 213 shown in FIG. The cross section by the including plane is shown.). 21 is a front view showing the telescopic cylinder device 213 in a state extended from the state of FIG. 19 (shown from the same position as in FIG. 19), and FIG. 22 is shown in FIG. It is the cross-sectional view of the present apparatus 213 (showing the cross section by the plane including the straight line L which will be described later). Further, FIG. 23 is an enlarged cross-sectional view in the circle E shown by the dotted line in FIG. 22, and FIG. 24 is an enlarged cross-sectional view in the circle F shown by the dotted line in FIG. 22. The present device 213 configured by the double-acting cylinder will be described with reference to FIGS. 19 to 24. For ease of explanation and understanding, the X-axis, Y-axis, and Z-axis, which are three orthogonal axes, are used (here, the Z-axis is vertical), and the respective directions are indicated by arrows Y and arrows in the drawing. It is indicated by Z (Note that the arrow X does not appear in the figure because FIGS. 19 to 24 show a plane perpendicular to the X axis).

The apparatus 213 has a first cylinder 251 and a second cylinder 252 that is slidably fitted in the first cylinder 251 in the Z-axis direction (the second cylinder 252 functions as a piston with respect to the first cylinder 251). The shaft 253 fitted in the second cylinder 252 so as to be slidable in the Z-axis direction (the shaft 253 functions as a piston with respect to the second cylinder 252) and the cylinder for attaching the present device 213 to the cylinder support member 131. Mounting tool 235 (Cylinder mounting tool 235 and cylinder support member 131 are mounted by mounting screws that are male screws. Note that FIGS. 19, 21, and 23 show female screws 232h that are screwed with the mounting screws. .) And.

The first cylinder 251 defines a right-cylinder-shaped internal space 251k having an axis included in a straight line L parallel to the Z-axis by an inner peripheral surface (the inner peripheral surface is along the side surface of the right-cylinder). It is formed of a hollow cylindrical member, and the cylindrical member is formed with a forward drive oil inlet 261 and a drive drive oil inlet 263 that communicate with the internal space 251 k. The lower end side of the first cylinder 251 is closed by the bottom plate member 251d, and the rod cover 281 described later is attached to the upper end side, forming a bottomless and uncovered shape. As will be described later, the forward drive oil inlet 261 is an inlet for pumping the drive oil for extending the device 213, and the drive drive oil inlet 263 is for pumping the drive oil for reducing the telescopic cylinder device 213. It is the entrance to the.

The second cylinder 252 is fitted in the internal space 251k of the first cylinder 251 from the upper end of the first cylinder 251 and has a piston portion 252p having an outer peripheral surface sliding on the inner peripheral surface of the first cylinder 251 and a piston. It includes a shaft portion 252s having one end attached to the portion 252p.
The piston portion 252p as a whole has a right-cylinder shape (the side surface of the right-sided cylinder forms the outer peripheral surface of the piston portion 252p, and the outer peripheral surface faces the inner peripheral surface of the first cylinder 251). , The piston portion 252p reciprocates in the Z-axis direction with respect to the first cylinder 251 in a state where the annular packing 252ps attached so as to go around the outer peripheral surface of the piston portion 252p is in contact with the inner peripheral surface of the first cylinder 251. Therefore, the liquidtightness between the outer peripheral surface of the piston portion 252p and the inner peripheral surface of the first cylinder 251 is maintained during the reciprocating motion (the outer peripheral surface of the piston portion 252p and the inner peripheral surface of the first cylinder 251). The driving oil is sealed between and.).
The shaft portion 252s is formed by a hollow cylindrical member defined by an inner peripheral surface (the inner peripheral surface is along the side surface of the rectangular cylinder) in a rectangular cylinder-shaped internal space 252k having an axis included in the straight line L. The cylindrical member is formed and has an outer peripheral surface along the side surface of a right-sided cylinder having an axis included in the straight line L. The lower end side of the shaft portion 252s is closed by the piston portion 252p, and the cylinder attachment 235 described later is attached to the upper end side. Further, on the internal space 252k side of the piston portion 252p, a hollow (pipe shape with both ends open) communication pipe 252pd having an outer peripheral surface along the side surface of a straight cylinder having an axis included in the straight line L is attached. There is. One end (lower end) of the communication pipe 252pd communicates with the internal space 272 between the outer peripheral surface of the shaft portion 252s and the inner peripheral surface of the first cylinder 251 by the communication passage 252pc1 formed in the piston portion 252p. In addition, the lower side (bottom plate member 251d side) and the upper side (internal space 252k side) of the piston portion 252p are communicated with each other by a communication passage 252pc2 formed in the piston portion 252p. The shaft portion 252s penetrates the rod cover 281 attached to the upper end of the first cylinder 251 and is connected to the inner peripheral surface of the rod cover 281 and the outer peripheral surface of the shaft portion 252s by the annular packing 287 attached to the rod cover 281. The shaft portion 252s is slidable in the Z-axis direction with respect to the rod cover 281 while the liquidtightness between them is maintained.

The shaft 253 is fitted in the internal space 252k of the second cylinder 252 from the upper end of the second cylinder 252, and has a piston portion 253p having an outer peripheral surface sliding on the inner peripheral surface of the shaft portion 252s and a piston portion 253p. It includes a shaft portion 253s to which one end is attached.
The piston portion 253p as a whole has a right cylinder shape (the side surface of the right cylinder forms the outer peripheral surface of the piston portion 253p, and the outer peripheral surface faces the inner peripheral surface of the shaft portion 252s). The piston portion 253p reciprocates in the Z-axis direction with respect to the second cylinder 252 in a state where the annular packing 253ps attached so as to go around the outer peripheral surface of the piston portion 253p is in contact with the inner peripheral surface of the shaft portion 252s. The liquidtightness between the outer peripheral surface of the piston portion 253p and the inner peripheral surface of the shaft portion 252s is maintained during the reciprocating motion.
The shaft portion 253s has an outer peripheral surface along the side surface of a right-cylinder having an axis included in the straight line L, and a right-sided cylindrical internal space 253r having an axis included in the straight line L (the lower end is a piston portion described later). It is connected to the through hole of 253p and the upper end is closed.) Is formed. A straight cylindrical through hole having an axis included in the straight line L is also formed in the piston portion 253p, and a communication pipe 252pd is inserted into the through hole and the internal space 253r from below. The liquidtightness between the outer peripheral surface of the communication pipe 252pd penetrating the through hole of the piston portion 253p and the inner peripheral surface defining the through hole of the piston portion 253p is determined by the piston portion 253p so as to go around the through hole. It is held by an attached annular packing 253pss (particularly see FIG. 24). Further, the shaft portion 253s is formed with a communication hole 253h for communicating the inner peripheral surface side (internal space 253r) of the shaft portion 253s and the outer peripheral surface side.

Such a shaft portion 253s penetrates the cylinder fitting 235 attached to the upper end of the second cylinder 252.
The cylinder mounting tool 235 has a main body portion in which a cylindrical portion 235a forming the upper portion of the cylinder mounting tool 235 and a quadrangular prism portion 235b forming the lower portion of the cylinder mounting tool 235 are rotatably mounted around a straight line L. Have. Further, as shown in FIG. 23, the cylindrical portion 235a of the cylinder fitting 235 has an annular shape with a slide bearing 236 (similar to the slide bearing 36, 136) made of synthetic resin, metal (for example, copper) or the like. Packing 237 (similar to packings 37 and 137), annular dust seal 238 (similar to dust seals 38 and 138), and O-ring 239 (similar to O-rings 39 and 139) are formed into a cylindrical portion. It is inside 235a (the packing 237, the dust seal 238, and the O-ring 239 are all fixed to the cylindrical portion 235a and cannot rotate around the straight line L relative to the cylindrical portion 235a. is there.).
The driving oil existing in the internal space 252k lubricates the slide bearing 236 (which supports the shaft portion 253s that slides in the Z-axis direction with respect to the cylinder fitting 235), and is sealed by the annular packing 237 (the packing 237 is the shaft). By sliding contact with the outer peripheral surface of the portion 253s, the outer peripheral surface of the shaft portion 253s and the inner peripheral surface of the cylindrical portion 235a are sealed so that the driving oil does not pass through the cylinder portion 253s. It prevents the driving oil from leaking from the gap between the upper hole of the tool 235 and the shaft portion 253s (note that the annular dust seal 238 prevents dust and the like from entering the slide bearing 236 direction from the gap. It is to prevent.) The shaft portion 253s is mounted on the cylinder while the liquidtightness between the inner peripheral surface of the cylinder fitting 235 and the outer peripheral surface of the shaft portion 253s is maintained by the annular packing 237 attached to the cylinder fitting 235 in this way. It is slidable in the Z-axis direction with respect to the tool 235.
Further, the shaft portion 252s and the cylindrical portion 235a are fixed to each other so as not to rotate around a straight line L, and among the driving oils that have reached the inside of the cylinder fitting 235, the outer peripheral surface of the shaft portion 252s and the inner surface of the cylindrical portion 235a. Exuding between the two is prevented by the annular O-ring 239.
The quadrangular prism portion 235b has a cylindrical portion 235a fitted therein, and a bearing 234 (see FIG. 23) disposed between the quadrangular prism portion 235b and the cylindrical portion 235a provides a cylindrical portion with respect to the quadrangular prism portion 235b. 235a is smoothly supported around the straight line L so as to be rotatable forward and backward.
The quadrangular prism portion 235b is attached to the cylinder support member 131 by a mounting screw that is a male screw (the quadrangular prism portion 235b is formed with a female screw 232h that is screwed with the mounting screw).
When the apparatus 213 expands and contracts, the cylinder support member 131 is supported so as to be reciprocating in the Z-axis direction. Therefore, the quadrangular prism portion 235b attached to the cylinder support member 131 does not rotate around the straight line L. Although it reciprocates in the Z-axis direction, the cylindrical portion 235a reciprocates in the Z-axis direction together with the quadrangular prism portion 235b while freely rotating around the straight line L.

The transition between the reduced state as shown in FIGS. 19 and 20 and the extended state as shown in FIGS. 21 and 22 in the present device 213 will be described.
An extension hydraulic unit (not shown), which is a hydraulic unit arranged in advance to extend the device 213, is connected to the forward drive oil inlet 261 and is arranged to reduce the device 213. A reduced hydraulic unit (not shown), which is a hydraulic unit, is connected to the drive drive oil inlet 263.
First, in the transition from the reduced state to the extended state, the extension hydraulic unit is operated to pump the driving oil to the forward driving oil inlet 261 of the apparatus 213 in the reduced state. The drive oil pumped to the forward drive oil inlet 261 flows into the space R1 existing between the bottom plate member 251d and the piston portion 252p in the internal space 251k, thereby causing the second cylinder 252 with respect to the first cylinder 251. The shaft 253 is projected from the second cylinder 252 by flowing into the space R2 existing between the piston portion 252p and the piston portion 253p in the internal space 252k through the communication passage 252pc2 (space R1 and space). Especially for R2, see FIG. 22). As a result, the transition from the reduced state to the expanded state is made.
On the other hand, in the reduced state, the space R3 between the inner peripheral surface of the shaft portion 252s and the outer peripheral surface of the shaft portion 253s, the communication hole 253h, the internal space 253r, the internal space of the communication pipe 252pd, the communication passage 252pc1, and the shaft portion 252s. Since the internal space 272 between the outer peripheral surface and the inner peripheral surface of the first cylinder 251 is filled with the driving oil discharged from the reduction hydraulic unit and injected from the drive oil inlet 263, the reduced state to the extended state. As the space R3 and the internal space 272 become smaller in the transition process to, the driving oil is discharged from the drive oil inlet 263 (the discharged driving oil returns to the reduced hydraulic unit).

Further, in the transition from the extended state to the reduced state, the reduced hydraulic unit is operated to pump the driving oil to the drive oil inlet 263 of the apparatus 213 in the extended state. The drive oil pumped to the drive oil inlet 263 flows into the internal space 272 between the outer peripheral surface of the shaft portion 252s and the inner peripheral surface of the first cylinder 251 to flow into the second cylinder 251 with respect to the first cylinder 251. The cylinder 252 is immersed, and the shaft 253 is immersed in the second cylinder 252 by flowing into the space R3 via the communication passage 252pc1, the communication pipe 252pd internal space, and the communication hole 253h. As a result, the transition from the stretched state to the contracted state is made.
In the extended state, the space R1 existing between the bottom plate member 251d and the piston portion 252p in the internal space 251k, the communication passage 252pc2, and the space R2 existing between the piston portion 252p and the piston portion 253p in the internal space 252k. Is filled with the driving oil discharged from the extension hydraulic unit and injected from the forward drive oil inlet 261. Therefore, as the space R1 and the space R2 become smaller in the transition process from the extension state to the reduction state, the forward drive is performed. The driving oil is discharged from the oil inlet 261 (the discharged driving oil returns to the extension hydraulic unit).
As described above, the transition from the contraction state to the extension state can be made by the driving oil pressure of the extension hydraulic unit, and the transition from the extension state to the reduction state can be made by the drive oil pressure of the reduction hydraulic unit.

In the transition process between the reduced state and the extended state, the first cylinder 251 is fixed to the main surface 121a (upper surface) of the base plate 121, and the shaft 253 (shaft portion 253s) is a box body support member. Since they are fixed to 127, the first cylinder 251 and the shaft 253 are prohibited from rotating around the straight line L, but the cylindrical portion 235a is a straight line with respect to the square pillar portion 235b attached to the cylinder support member 131. Since it is rotatable around L, the second cylinder 252 attached to the cylindrical portion 235a reciprocates in the Z-axis direction while freely rotating around the straight line L.
In this transition process between the contracted state and the extended state, the second cylinder 252 rotates around the straight line L with respect to the first cylinder 251 and the shaft 253, so that the packing 237 and the dust seal 238 become the shaft. The position around the straight line L sliding on the outer peripheral surface of the portion 253s changes. As a result, uneven wear of the packing 237 and the dust seal 238 (the state of wear differs depending on the position around the straight line L) can be prevented or significantly reduced, and the life of the packing 237 and the dust seal 238 can be significantly improved. .. This is when the shaft portion 253s is distorted in a certain direction from the straight line L (for example, when the lifting box body 115 which is a heavy object is cantilevered as shown in FIGS. 2 and 5), the shaft portion 253s Is distorted toward the elevating box body 115), the shaft portion 253s slides strongly at specific positions of the packing 237 and the dust seal 238 due to the distortion, and uneven wear is likely to occur, but on the outer peripheral surface of the shaft portion 253s. By changing the position around the sliding straight line L, uneven wear can be prevented or significantly reduced, and the life of the packing 237 and the dust seal 238 can be significantly improved.
Further, with respect to the packing 252 ps, the position around the straight line L sliding on the inner peripheral surface of the first cylinder 251 changes. As a result, uneven wear of the packing 252 ps can be prevented or significantly reduced, and the life can be significantly improved.

As described above, the present device 213 includes the first present device and the second present device.
That is, the first apparatus has an fitting portion (internal space 252k) fitted in the internal space (internal space 252k) of the cylinder portion (composed including the second cylinder 252 and the cylindrical portion 235a of the cylinder fitting 235). The shaft 253 is included in the shaft 253), and the driving fluid (driving oil in this case) is pumped into the internal space (internal space 252k) so that the first cylinder portion (second cylinder 252 and cylindrical portion 235a) is first. A telescopic cylinder device that expands and / or contracts (extends and contracts here) in a direction parallel to a straight line (straight line L), and forms a side surface portion of a straight cylinder having an axis existing on the first straight line (straight line L). It has a fitting portion (shaft 253) having a surface and a side surface portion of a straight cylinder having an axis existing on a first straight line (straight line L), and has an inner peripheral surface defining the internal space (internal space 252k). A cylindrical portion (second cylinder 252) in which the fitting portion (shaft 253) is internally fitted so as to be able to advance and retreat in a direction parallel to the first straight line (straight line L) while the outer peripheral surface of the portion (shaft 253) is surrounded by the inner peripheral surface. And the cylindrical portion 235a), and one of the fitting portion (shaft 253) and the tubular portion (second cylinder 252 and cylindrical portion 235a) (here, the tubular portion (second cylinder 252 and cylindrical portion 235a)). An annular sliding member (here, an annular packing 237 and an annular dust seal 238) that slides with the other (here, the fitting portion (shaft 253)) so as to surround one straight line (straight line L), and a first straight line (straight line). A support (cylinder support member 131) that is restricted to be displaced so as to have a component in any direction perpendicular to L) (here, it is also restricted to be displaced to have a component in any direction). A mounting tool (here, a square pillar portion 235b) that is attached to and rotatably supports one of them (cylinder portion (second cylinder 252 and cylindrical portion 235a)) around a first straight line (straight line L). It is a telescopic cylinder device provided.

In the first device included in the device 213, one of the above is a cylindrical portion (second cylinder 252 and cylindrical portion 235a), and the fitting portion (shaft 253) has a rod shape extending along the first straight line (straight line L). (Shaft portion 253s) is included, and the cylinder portion (second cylinder 252 and cylindrical portion 235a) includes the cylinder body (shaft portion 252s) into which the base end side of the shaft portion (shaft portion 253s) is fitted. A rod cover body (cylindrical part 235a) that has a through hole through which the shaft part (shaft part 253s) penetrates and is non-rotatably attached to one end of the cylinder body (shaft part 252s) around a first straight line (straight line L). The rod cover body (cylindrical portion 235a) is included so that the sliding member (annular packing 237, annular dust seal 238) goes around the outer peripheral surface of the shaft portion (shaft portion 253s) penetrating the through hole. ), And the fixture (square pillar portion 235b) is rotatably attached around the first straight line (straight line L) with respect to the rod cover main body (cylindrical portion 235a), and the support (cylinder support). It is configured to include a rod cover mounting portion (square column portion 235b) to be mounted on the member 131).

The second device included in the device 213 is a fitting portion (first) fitted in the internal space (internal space 251k) of the cylinder portion (composed of including the first cylinder 251 and the rod cover 281). The cylinder portion (first cylinder 251) is formed by pumping the driving fluid (driving oil) into the internal space (internal space 251k) of the two cylinders 252 and the cylindrical portion 235a of the cylinder fitting 235. And the rod cover 281), which is a telescopic cylinder device that extends and / or contracts (extends and contracts here) in the direction parallel to the first straight line (straight line L), and has an axis existing on the first straight line (straight line L). A fitting portion (second cylinder 252 and cylinder portion 235a) having an outer peripheral surface forming a side surface portion of the right-sided cylinder having a side surface portion and a side surface portion of the right-sided cylinder having an axis existing on the first straight line (straight line L) are formed, and the internal space ( It has an inner peripheral surface that defines the internal space 251k), and the fitting portion (second cylinder 252 and cylindrical portion) is surrounded by the inner peripheral surface of the fitting portion (second cylinder 252 and cylindrical portion 235a). A tubular portion (first cylinder 251 and rod cover 281) that internally fits 235a) in a direction parallel to the first straight line (straight line L), and a fitting portion (second cylinder 252 and cylindrical portion 235a) and a tubular portion (cylinder portion 235a). It is attached to one of the first cylinder 251 and the rod cover 281 (here, the fitting portion (the second cylinder 252 and the cylindrical portion 235a)), and the other (here, the cylinder portion (here, the cylinder portion (here)) so as to surround the first straight line (straight line L). An annular sliding member (here, an annular packing 252 ps) that slides on the first cylinder 251 and a rod cover 281)), and a component in either direction perpendicular to the first straight line (straight line L). It is attached to a support (cylinder support member 131) whose displacement is restricted (here, it is also restricted to have a component in either direction), and one of them (fitting portion (second cylinder 252 and cylinder). It is a telescopic cylinder device including a mounting tool (square pillar portion 235b) that rotatably supports a portion 235a)) around a first straight line (straight line L).

In the second device included in the device 213, one of the above (fitting portion (second cylinder 252 and cylindrical portion 235a)) is the fitting portion, and the fitting portion (second cylinder 252 and cylindrical portion 235a) is the cylinder. A piston portion 252p having the outer peripheral surface that is in sliding contact with the inner peripheral surface of the portion (first cylinder 251 and rod cover 281), and a rod-shaped shaft portion that is attached to the piston portion 252p and extends along a first straight line (straight line L). (Shaft portion 252s and cylindrical portion 235a) are included, and a sliding member (annular packing 252ps) is attached to the piston portion 252p so as to go around the outer peripheral surface of the piston portion 252p, and a fixture (square pillar). The portion 235b) is attached to the shaft portion (shaft portion 252s and cylindrical portion 235a).

The apparatus 213 has a first portion (shaft 253) having an outer peripheral surface forming a side surface portion of a right cylinder having an axis existing on the first straight line (straight line L) and an axis existing on the first straight line (straight line L). An inner peripheral surface that forms a side surface portion of a right-sided cylinder and defines a second internal space (internal space 252k), and an outer peripheral surface that forms a side surface portion of a right-sided cylinder having an axis existing on a first straight line (straight line L). A second internal space that allows the first portion (shaft 253) to move forward and backward in a direction parallel to the first straight line (straight line L) while the outer peripheral surface of the first portion (shaft 253) is surrounded by the inner peripheral surface. A second portion (second cylinder 252 and cylindrical portion 235a) fitted in (internal space 252k) and a side surface portion of a right cylinder having an axis existing on the first straight line (straight line L) are formed, and a third internal space (inside). It has an inner peripheral surface that defines the space 251k), and the outer peripheral surface of the second portion (second cylinder 252 and cylindrical portion 235a) is surrounded by the inner peripheral surface, and the second portion (second cylinder 252 and cylinder). A third portion (first cylinder 251 and rod cover 281) that fits the portion 235a) into the third internal space (internal space 251k) so as to be able to advance and retreat in the direction parallel to the first straight line (straight line L). The first portion (shaft 253) constitutes the fitting portion (shaft 253) of the present device 1, and the tubular portion (second cylinder 252 and cylindrical portion 235a) of the first present device is formed by the second portion (second cylinder 252). And the cylindrical portion 235a), and the fitting portion (second cylinder 252 and cylindrical portion 235a) of the second apparatus is composed of the second portion (second cylinder 252 and cylindrical portion 235a), and the second book. A third portion (first cylinder 251 and rod cover 281) constitutes a cylinder portion (first cylinder 251 and rod cover 281) of the device.

In this device 213, the fixture (square pillar portion 235b) in the first device and the fixture (square pillar portion 235b) in the second device are the second portion (second cylinder 252 and cylinder portion 235a). It is attached to.
In the apparatus 213, the fitting portion (shaft 253) of the first apparatus is configured by the first portion (shaft 253), and the cylinder portion (second cylinder 252 and the cylinder portion 235a) of the first apparatus is the first Two parts (second cylinder 252 and cylindrical part 235a) are formed, and the second part (second cylinder 252 and cylindrical part 235a) is the fitting part (second cylinder 252 and cylindrical part 235a) of the second apparatus. The second cylinder portion (first cylinder 251 and rod cover 281) of the present apparatus is configured by the third portion (first cylinder 251 and rod cover 281).
In the present device 213, the first present device is the one-sided tubular portion main device, and the second present device is the one-sided fitting portion main device.
In the present device 213, the first fitting (square pillar portion 235b) of the present device and the second fitting (square pillar portion 235b) of the second device are the second part (second cylinder 252 and cylindrical part). It is one attached to 235a).

(Third Embodiment)
FIG. 25 is a front view showing a telescopic cylinder device (this device) 313 according to a third embodiment of the present invention, and FIG. 26 is a cross-sectional view (a straight line L described later) of the present device 313 shown in FIG. The cross section by the including plane is shown.). 27 is a front view showing the apparatus 313 extended from the state of FIG. 25 (shown from the same position as in FIG. 25), and FIG. 28 is shown in FIG. 27. It is a cross-sectional view of the present device 313 (showing a cross section in a plane including a straight line L described later). Further, FIG. 29 is an enlarged cross-sectional view in the circle D shown by the dotted line in FIG. 28, and FIG. 30 is an enlarged cross-sectional view in the circle E shown by the dotted line in FIG. 28. The present device 313 will be described with reference to FIGS. 25 to 30. For ease of explanation and understanding, the X-axis, Y-axis, and Z-axis, which are three orthogonal axes, are used (here, the Z-axis is vertical), and the respective directions are indicated by arrows Y and arrows in the drawing. It is indicated by Z (Note that the arrow X does not appear in the figure because FIGS. 25 to 30 show a plane perpendicular to the X axis).

The apparatus 313 has a first cylinder 351 and a second cylinder 352 fitted in the first cylinder 351 slidably in the Z-axis direction (the second cylinder 352 functions as a piston with respect to the first cylinder 351). A shaft 353 (the shaft 353 functions as a piston with respect to the second cylinder 352) fitted in the second cylinder 352 so as to be slidable in the Z-axis direction, and a cylinder for attaching the present device 313 to the cylinder support member 131. Mounting tool 335 (The cylinder mounting tool 335 and the cylinder support member 131 are mounted by a mounting screw that is a male screw. FIGS. 25, 27, and 29 show a female screw 332h that is screwed with the mounting screw. .) And.

In the first cylinder 351, an inner peripheral surface (the inner peripheral surface is along the side surface of the right-cylinder) defines a right-cylinder-shaped internal space 351k having an axis included in a straight line L parallel to the Z-axis. It is formed of a hollow cylindrical member, and the cylindrical member is formed with a driving oil inlet 361 communicating with an internal space 351k. The lower end side of the first cylinder 351 is closed by the bottom plate member 351d, and the rod cover 381 described later is attached to the upper end side, forming a bottomed and uncovered shape. As will be described later, the driving oil inlet 361 is an inlet for pumping the driving oil for extending the apparatus 313.

The second cylinder 352 is fitted inside the internal space 351k of the first cylinder 351 from the upper end of the first cylinder 351 and has a piston portion 352p having an outer peripheral surface sliding on the inner peripheral surface of the first cylinder 351 and a piston. It includes a shaft portion 352s having one end attached to the portion 352p.
The piston portion 352p as a whole has a right cylinder shape (the side surface of the right cylinder forms the outer peripheral surface of the piston portion 352p, and the outer peripheral surface faces the inner peripheral surface of the first cylinder 351). The piston portion 352p reciprocates in the Z-axis direction with respect to the first cylinder 351 in a state where the annular packing 352ps attached so as to go around the outer peripheral surface of the piston portion 352p is in contact with the inner peripheral surface of the first cylinder 351. Therefore, the liquidtightness between the outer peripheral surface of the piston portion 352p and the inner peripheral surface of the first cylinder 351 is maintained during the reciprocating motion.
The shaft portion 352s is formed by a hollow cylindrical member defined by an inner peripheral surface (the inner peripheral surface is along the side surface of the rectangular cylinder) in a rectangular cylinder-shaped internal space 352k having an axis included in the straight line L. The cylindrical member is formed and has an outer peripheral surface along the side surface of a right-sided cylinder having an axis included in the straight line L. The lower end side of the shaft portion 352s is closed by the piston portion 352p, and the cylinder attachment 335 described later is attached to the upper end side. Further, the internal space 372 between the outer peripheral surface of the shaft portion 352s and the inner peripheral surface of the first cylinder 351 includes the continuous passages 352pc1 and 352pc2 formed in the piston portion 352p and the piston portion 352p above the continuous passages 352pc1 and 352pc2. It communicates with the lower end of the internal space 352k of the shaft portion 352s by the gap 352 bp formed between the outer peripheral surface and the inner peripheral surface of the first cylinder 351 (the communication passages 352 pc1, 352 pc2 and the gap 352 bp communicate with each other). are doing. The driving oil is injected into the internal space 352k and the internal space 372 in advance, and the interior space 352k and the internal space 372 can freely move back and forth between the internal space 352k and the internal space 372 via the communication passages 352pc1, 352pc2 and the gap 352ppb.
The shaft portion 352s penetrates the rod cover 381 attached to the upper end of the first cylinder 351 and is connected to the inner peripheral surface of the rod cover 381 and the outer peripheral surface of the shaft portion 352s by the annular packing 387 attached to the rod cover 381. The shaft portion 352s is slidable in the Z-axis direction with respect to the rod cover 381 in a state where the liquidtightness between them is maintained.

The shaft 353 is fitted in the internal space 352k of the second cylinder 352 from the upper end of the second cylinder 352, and one end is attached to the bearing portion 353p sliding on the inner peripheral surface of the shaft portion 352s and the bearing portion 353p. The shaft portion 353s and the like are included.
The bearing portion 353p as a whole has a rectangular shape in which the shaft is included in the straight line L (the side surface of the straight cylinder forms the outer peripheral surface of the bearing portion 353p, and the outer peripheral surface faces the inner peripheral surface of the shaft portion 352s). Since the bearing portion 353p is attached to the tip (lower end) of the shaft 353, the bearing portion 353p slides smoothly on the inner peripheral surface of the shaft portion 352s, so that the shaft 353 smoothly slides in the Z-axis direction with respect to the second cylinder 352. Can reciprocate to.
The shaft portion 353s has an outer peripheral surface along the side surface of a right circular cylinder having an axis included in the straight line L.

Such a shaft portion 353s penetrates a cylinder fitting 335 attached to the upper end of the second cylinder 352 (shaft portion 352s).
The cylinder mounting tool 335 has a main body portion in which a cylindrical portion 335a forming the upper portion of the cylinder mounting tool 335 and a square pillar portion 335b forming the lower portion of the cylinder mounting tool 335 are rotatably mounted around a straight line L. Have. Further, as shown in FIG. 29, the cylindrical portion 335a of the cylinder fitting 335 is the same as the sliding bearing 336 (sliding bearing 36, 136, 236, 536) made of synthetic resin, metal (for example, copper) or the like. ), An annular packing 337 (similar to packing 37, 137, 237, 537), an annular dust seal 338 (similar to dust seal 38, 138, 238, 538), and an O-ring 339 (similar to O-ring 39). (Similar to 139, 239, 339) and inside the cylindrical portion 335a (the packing 337, the dust seal 338, and the O-ring 339 are all fixed to the cylindrical portion 335a and have a straight line L. It is relatively non-rotatable with respect to the cylindrical portion 335a around it.)
The driving oil existing in the internal space 352k lubricates the slide bearing 336 (which supports the shaft portion 353s that slides in the Z-axis direction with respect to the cylinder fitting 335), and is sealed by the annular packing 337 (the packing 337 is the shaft). By sliding contact with the outer peripheral surface of the portion 353s, the outer peripheral surface of the shaft portion 353s and the inner peripheral surface of the cylindrical portion 335a are sealed so that the driving oil does not pass through the cylinder portion 353s. It prevents the driving oil from leaking from the gap between the upper hole of the tool 335 and the shaft portion 353s (Note that the annular dust seal 338 prevents dust and the like from entering the slide bearing 336 direction from the gap. It is to prevent.) The shaft portion 353s is mounted on the cylinder while the liquidtightness between the inner peripheral surface of the cylinder fitting 335 and the outer peripheral surface of the shaft portion 353s is maintained by the annular packing 337 attached to the cylinder fitting 335 in this way. It is slidable in the Z-axis direction with respect to the tool 335.
Further, the shaft portion 352s and the cylindrical portion 335a are fixed to each other so as not to rotate around a straight line L, and among the driving oils that have reached the inside of the cylinder fitting 335, the outer peripheral surface of the shaft portion 352s and the inner surface of the cylinder fitting 335. Exuding between and is prevented by the annular O-ring 339.
The quadrangular prism portion 335b has a cylindrical portion 335a fitted therein, and a bearing 334 (see FIG. 29) disposed between the quadrangular prism portion 335b and the cylindrical portion 335a provides a cylindrical portion with respect to the quadrangular prism portion 335b. The 335a is smoothly supported around the straight line L so as to be rotatable forward and backward.
The quadrangular prism portion 335b is attached to the cylinder support member 131 by a mounting screw that is a male screw (the quadrangular prism portion 335b is formed with a female screw 332h to be screwed with the mounting screw).
When the apparatus 313 expands and contracts, the cylinder support member 131 is supported so as to be reciprocating in the Z-axis direction. Therefore, the quadrangular prism portion 335b attached to the cylinder support member 131 does not rotate around the straight line L. Although it reciprocates in the Z-axis direction, the cylindrical portion 335a reciprocates in the Z-axis direction together with the quadrangular prism portion 335b while freely rotating around the straight line L.

The transition between the reduced state as shown in FIGS. 25 and 26 and the expanded state as shown in FIGS. 27 and 28 in the present device 313 will be described.
An extension hydraulic unit (not shown), which is a hydraulic unit arranged for extending the apparatus 313 in advance, is connected to the drive oil inlet 361, and as described above, the internal space 352k and the internal space 372 (gap 352pb) are connected. ) And the passages 352pc1 and 352pc2 are filled with driving oil.
First, in the transition from the reduced state to the extended state, the extension hydraulic unit is operated to pump the drive oil to the drive oil inlet 361 in the reduced state. The driving oil pumped to the driving oil inlet 361 flows into the space R1 existing between the bottom plate member 351d and the piston portion 352p in the internal space 351k, so that the second cylinder 352 protrudes from the first cylinder 351. .. As the internal space 372 shrinks as the second cylinder 352 projects with respect to the first cylinder 351 as described above, the driving oil filled in the internal space 372 fills the gap 352 ppb and the communication passages 352 pc1 and 352 pc2. The shaft 353 is projected from the second cylinder 352 by flowing into the space R2 existing between the piston portion 352p and the shaft 353 in the internal space 352k (particularly FIG. 28 for the space R1 and the space R2). See.). As a result, the transition from the reduced state to the expanded state is made.

Further, the transition from the extended state to the reduced state is caused by the own weight (gravity) of the second cylinder 352 and the shaft 353 by reducing the pressure of the driving oil supplied from the extension hydraulic unit (not shown) to the drive oil inlet 361. , The second cylinder 352 is immersed in the first cylinder 351 and the shaft 353 is immersed in the second cylinder 352.
Specifically, due to a decrease in the pressure of the driving oil supplied to the driving oil inlet 361, the driving oil is discharged from the driving oil inlet 361 by the own weight of the second cylinder 352 and the shaft 353 (the discharged driving oil is the extension hydraulic pressure). Return to the unit.). As a result, the second cylinder 352 is lowered (immersed) with respect to the first cylinder 351. Since the descent (immersion) of the second cylinder 352 with respect to the first cylinder 351 expands the internal space 372, the driving oil existing in the space R2 is sucked into the internal space 372 via the gap 352 ppb and the communication passages 352 pc1 and 352 pc2. , The shaft 353 is lowered (immersed) with respect to the second cylinder 352. As a result, the transition from the stretched state to the contracted state is made.
As described above, the transition from the contracted state to the extended state can be made by the driving oil pressure of the extension hydraulic unit, and the transition from the extended state to the reduced state is made by the own weight (gravity) of the second cylinder 352 and the shaft 353. be able to.

In the transition process between the reduced state and the extended state, the first cylinder 351 is fixed to the main surface 121a (upper surface) of the base plate 121, and the shaft 353 (shaft portion 353s) is a box body support member. Since they are fixed to 127, the first cylinder 351 and the shaft 353 are prohibited from rotating around the straight line L, but the cylindrical portion 335a is a straight line with respect to the square pillar portion 335b attached to the cylinder support member 131. Since it is rotatable around L, the second cylinder 352 attached to the cylindrical portion 335a reciprocates in the Z-axis direction while freely rotating around the straight line L.
In this transition process between the contracted state and the extended state, the second cylinder 352 rotates around the straight line L with respect to the first cylinder 351 and the shaft 353, so that the packing 337 and the dust seal 338 become the shaft. The position around the straight line L sliding on the outer peripheral surface of the portion 353s changes. As a result, uneven wear of the packing 337 and the dust seal 338 (the wear state differs depending on the position around the straight line L) can be prevented or significantly reduced, and the life of the packing 337 and the dust seal 338 can be significantly improved. .. This is the case where the shaft portion 353s is distorted in a certain direction from the straight line L (for example, when the lifting box body 115 which is a heavy object is cantilevered as shown in FIGS. 2 and 5), the shaft portion 353s Is distorted toward the elevating box body 115), the shaft portion 353s slides strongly at specific positions of the packing 337 and the dust seal 338 due to the distortion, and uneven wear is likely to occur, but on the outer peripheral surface of the shaft portion 353s. By changing the position around the sliding straight line L, uneven wear can be prevented or significantly reduced, and the life of the packing 337 and the dust seal 338 can be significantly improved.
Further, with respect to the packing 352ps, the position around the straight line L sliding on the inner peripheral surface of the first cylinder 351 changes. As a result, uneven wear of the packing 352 ps can be prevented or significantly reduced, and the life can be significantly improved.

As described above, the present device 313 includes the first present device and the second present device.
That is, the first device has an fitting portion (internal space 352k) fitted in the internal space (internal space 352k) of the tubular portion (composed including the second cylinder 352 and the cylindrical portion 335a of the cylinder fitting 335). The shaft 353 is included in the shaft 353), and the driving fluid (driving oil in this case) is pumped into the internal space (internal space 352k) so that the first cylinder portion (second cylinder 352 and cylindrical portion 335a) is first. A telescopic cylinder device that expands and / or contracts (extends here) in a direction parallel to a straight line (straight line L), and forms an outer peripheral surface that forms a side surface portion of a straight cylinder having an axis existing on the first straight line (straight line L). It has an fitting portion (shaft 353) and a side surface portion of a straight cylinder having an axis existing on a first straight line (straight line L), and has an inner peripheral surface that defines the internal space (internal space 352k). A cylinder portion (second cylinder 352 and a cylinder) in which the fitting portion (shaft 353) is internally fitted so as to be able to advance and retreat in a direction parallel to the first straight line (straight line L) while the outer peripheral surface of the shaft 353) is surrounded by the inner peripheral surface. Part 335a), one of the fitting part (shaft 353) and the cylinder part (second cylinder 352 and cylinder part 335a) (here, the cylinder part (second cylinder 352 and cylinder part 335a)), and the first straight line An annular sliding member (here, an annular packing 337 and an annular dust seal 338) that slides with the other (here, the fitting portion (shaft 353)) so as to surround (straight line L), and a first straight line (straight line L). Attached to a support (cylinder support member 131) restricted to have a component in either direction perpendicular to (here also restricted to have a component in any direction) A fixture (here, a square pillar portion 335b) that rotatably supports one of them (cylinder portion (second cylinder 352 and cylindrical portion 335a)) around a first straight line (straight line L) is provided. It is a telescopic cylinder device.

In the first device included in the device 313, one of the above is a cylindrical portion (second cylinder 352 and a cylindrical portion 335a), and the fitting portion (shaft 353) has a rod shape extending along a first straight line (straight line L). The shaft portion (shaft portion 353s) is included, and the cylinder portion (second cylinder 352 and the cylindrical portion 335a) includes the cylinder body (shaft portion 352s) into which the base end side of the shaft portion (shaft portion 353s) is fitted. A rod cover body (cylindrical portion 335a) that has a through hole through which the shaft portion (shaft portion 353s) penetrates and is non-rotatably attached to one end of the cylinder body (shaft portion 352s) around a first straight line (straight line L). The rod cover body (cylindrical portion 335a) is included so that the sliding member (annular packing 337, annular dust seal 338) goes around the outer peripheral surface of the shaft portion (shaft portion 353s) penetrating the through hole. ), And the fixture (square pillar portion 335b) is rotatably attached around the first straight line (straight line L) with respect to the rod cover main body (cylindrical portion 335a), and the support (cylinder support). It is configured to include a rod cover mounting portion (square column portion 335b) to be mounted on the member 131).

The second device included in the device 313 is a fitting portion (first) fitted in the internal space (internal space 351k) of the cylinder portion (composed of including the first cylinder 351 and the rod cover 381). The cylinder portion (first cylinder 351) is formed by pumping the driving fluid (driving oil) into the internal space (internal space 351k) of the two cylinders 352 and the cylindrical portion 335a of the cylinder fitting 335. And rod cover 381) is a telescopic cylinder device that extends and / or contracts (extends here) in the direction parallel to the first straight line (straight line L), and has a straight axis existing on the first straight line (straight line L). The internal space (internal space) forms a fitting portion (second cylinder 352 and cylindrical portion 335a) having an outer peripheral surface forming a side surface portion of the cylinder and a side surface portion of a straight cylinder having an axis existing on the first straight line (straight line L). The fitting portion (second cylinder 352 and cylindrical portion 335a) has an inner peripheral surface that defines 351k), and the outer peripheral surface of the fitting portion (second cylinder 352 and cylindrical portion 335a) is surrounded by the inner peripheral surface. The cylinder part (first cylinder 351 and rod cover 381), the fitting part (second cylinder 352 and the cylinder part 335a), and the cylinder part (first cylinder) are internally fitted so as to be able to advance and retreat in the direction parallel to the first straight line (straight line L). It is attached to one of the cylinder 351 and the rod cover 381 (here, the fitting portion (the second cylinder 352 and the cylindrical portion 335a)), and the other (here, the cylinder portion (the first)) surrounds the first straight line (straight line L). The cylinder 351 and the rod cover 381)) are displaced so as to have an annular sliding member (here, an annular packing 352 ps) and a component in either direction perpendicular to the first straight line (straight line L). It is attached to a support (cylinder support member 131) that is restricted (here it is also restricted to be displaced to have components in either direction), and one of them (fitting portion (second cylinder 352 and cylindrical portion 335a). )) Is a telescopic cylinder device including a mounting tool (square pillar portion 335b) that rotatably supports the first straight line (straight line L).

In the second device included in the device 313, one of the above (fitting portion (second cylinder 352 and cylindrical portion 335a)) is the fitting portion, and the fitting portion (second cylinder 352 and cylindrical portion 335a) is the cylinder. A piston portion 352p having the outer peripheral surface that is in sliding contact with the inner peripheral surface of the portion (first cylinder 351 and rod cover 381), and a rod-shaped shaft portion that is attached to the piston portion 352p and extends along a first straight line (straight line L). (Shaft portion 352s and cylindrical portion 335a) are included, and a sliding member (annular packing 352ps) is attached to the piston portion 352p so as to go around the outer peripheral surface of the piston portion 352p, and a fixture (square pillar). The portion 335b) is attached to the shaft portion (shaft portion 352s and cylindrical portion 335a).

In the present device 313, a first portion (shaft 353) having an outer peripheral surface forming a side surface portion of a straight cylinder having an axis existing on the first straight line (straight line L) and an axis existing on the first straight line (straight line L). An inner peripheral surface that forms a side surface portion of a right-sided cylinder and defines a second internal space (internal space 352k), and an outer peripheral surface that forms a side surface portion of a right-sided cylinder having an axis existing on a first straight line (straight line L). The second inner surface is capable of advancing and retreating the first portion (shaft 353) in a direction parallel to the first straight line (straight line L) while the inner peripheral surface of the first portion (shaft 353) is surrounded by the inner peripheral surface. The third internal space (the second cylinder 352 and the cylindrical portion 335a) forming a side portion of a right cylinder having an axis existing on the first straight line (straight line L), which is internally fitted into the space (internal space 352k). It has an inner peripheral surface that defines the internal space 351k), and the outer peripheral surface of the second portion (second cylinder 352 and cylindrical portion 335a) is surrounded by the inner peripheral surface, and the second portion (second cylinder 352) A third portion (first cylinder 351 and rod cover 381) that fits the cylindrical portion 335a) into the third internal space (internal space 351k) so as to be able to advance and retreat in the direction parallel to the first straight line (straight line L) is provided. The first portion (shaft 353) constitutes the fitting portion (shaft 353) of the first apparatus, and the tubular portion (second cylinder 352 and cylindrical portion 335a) of the first apparatus is formed by the second portion (second cylinder). The second portion (second cylinder 352 and cylindrical portion 335a) constitutes the fitting portion (second cylinder 352 and cylindrical portion 335a) of the second apparatus, and the second portion (second cylinder 352 and cylindrical portion 335a) constitutes the second. A third portion (first cylinder 351 and rod cover 381) constitutes a cylinder portion (first cylinder 351 and rod cover 381) of the present device.

In this device 313, the fixture (square pillar portion 335b) in the first device and the fixture (square pillar portion 335b) in the second device are the second portion (second cylinder 352 and cylinder portion 335a). It is attached to.
In the apparatus 313, the first portion (shaft 353) constitutes the first fitting portion (shaft 353) of the present apparatus, and the cylinder portion (second cylinder 352 and the cylinder portion 335a) of the first apparatus is the first Two parts (second cylinder 352 and cylindrical part 335a) are formed, and the second part (second cylinder 352 and cylindrical part 335a) forms the fitting part (second cylinder 352 and cylindrical part 335a) of the second apparatus. The second cylinder portion (first cylinder 351 and rod cover 381) of the present apparatus is configured by the third portion (first cylinder 351 and rod cover 381).
In the present device 313, the first present device is the one-sided cylinder portion main device, and the second present device is the one-sided fitting portion main device.
In the present device 313, the first fitting (square pillar portion 335b) of the present device and the second fitting (square pillar portion 335b) of the second device are the second part (second cylinder 352 and cylindrical part). It is one attached to 335a).

13 Telescopic cylinder device (this device)
34 Bearing 35 Cylinder fitting 35a Cylindrical part 35b Square pillar part 35bh Female screw 35h1 Gap 36 Sliding bearing 37 Packing 38 Dust seal 39 O-ring 101 Elevator mechanism 113 Telescopic cylinder device 115 Lifting box body 121 Base plate 121a Main surface 123, 125 Guide rail 123a, 125a Guide groove 127 Box body support member 129 Connecting member 131 Cylinder support member 132 Mounting screw 132h Female screw 135 Cylinder mounting tool 135a Cylindrical part 135b Square pillar part 135h1 Gap 136 Sliding bearing 137 Packing 138 Dust seal 139 O-ring 151 Bottom plate member 151k Internal space 152 2nd cylinder 152k Internal space 152p Piston part 152s Shaft part 153 Shaft 153p Bearing part 153s Shaft part 161 Drive oil inlet 171 Internal space 173 Internal space 173d Gap 173c Gap 175 Continuous passage 181 Rod cover 187 Cylinder device (this device)
232h Female screw 234 Bearing 235 Cylinder fitting 235a Cylindrical part 235b Square pillar part 236 Sliding bearing 237 Packing 238 Dust seal 239 O-ring 251 First cylinder 251d Bottom plate member 251k Internal space 252 Second cylinder 252k Internal space 252p Piston part 252p Piston part 252p 252pd Communication pipe 252s Shaft part 252ps Packing 253 Shaft 253h Communication hole 253p Piston part 253ps Packing 253ps Packing 253r Internal space 253s Shaft part 261 Forward drive oil inlet 263 Driven drive oil inlet 263 (This device)
332h Female screw 334 Bearing 335 Cylinder fitting 335a Cylindrical part 335b Square pillar part 336 Sliding bearing 337 Packing 338 Dust seal 339 O-ring 351 1st cylinder 351d Bottom plate member 351k Internal space 352 2nd cylinder 352p 352k Internal space 352p Communication passage 352ps Packing 352s Shaft part 353 Shaft 353p Bearing part 353s Shaft part 361 Drive oil inlet 372 Internal space 381 Rod cover 387 Packing 513 Telescopic cylinder device 532h Female screw 535 Cylinder fitting 535a Cylindrical part 535b Cylindrical part 535b Dust seal 539 O-ring 551 1st cylinder 551d Bottom plate member 551k Internal space 552 2nd cylinder 552k Internal space 552p Piston part 552pb Gap 552pc1, 552pc2 Continuous passage 552s Shaft part 552ps Packing 5553 Shaft 553p Space 573c Gap 581 Rod cover 587 Packing

Claims (8)

It is a telescopic cylinder device that expands and / or contracts the fitting portion internally fitted in the internal space of the cylinder portion including the cylinder in a direction parallel to the first straight line with respect to the cylinder portion by pumping a driving fluid into the internal space. hand,
A fitting portion having an outer peripheral surface forming a side surface portion of a right circular cylinder having an axis existing on a first straight line,
The fitting portion is first formed by forming a side surface portion of a right circular cylinder having an axis existing on a first straight line, having an inner peripheral surface defining the internal space, and surrounding the outer peripheral surface of the fitting portion with the inner peripheral surface. A cylinder that fits inwardly in a direction parallel to the straight line,
An annular sliding member that is attached to one of the fitting portion and the tubular portion and slides with the other so as to surround the first straight line.
A fixture that is mounted on a support that is restricted to displace so as to have a component in either direction perpendicular to the first straight line and that rotatably supports one of them around the first straight line.
Be prepared for
A telescopic cylinder device in which a sliding member rotates with respect to the other by rotating one of them around a first straight line. One of the above is the cylinder part,
The fitting portion comprises a rod-shaped shaft portion extending along the first straight line.
A cylinder body into which the base end side of the shaft portion is fitted, and a rod cover body having a through hole through which the shaft portion penetrates and being non-rotatably attached to one end of the cylinder body around a first straight line. Including,
A sliding member is attached to the rod cover body so as to go around the outer peripheral surface of the shaft portion penetrating the through hole.
The first aspect of the present invention, wherein the fixture is rotatably attached to the rod cover main body around a first straight line, and includes a rod cover attachment portion to be attached to the support. Telescopic cylinder device. One of the above is the fitting part,
The fitting portion includes a piston portion having the outer peripheral surface that is in sliding contact with the inner peripheral surface of the tubular portion, and a rod-shaped shaft portion that is attached to the piston portion and extends along a first straight line.
A sliding member is attached to the piston portion so as to go around the outer peripheral surface of the piston portion.
The telescopic cylinder device according to claim 1, wherein the fixture is attached to a shaft portion. A first portion having an outer peripheral surface forming a side surface portion of a right circular cylinder having an axis existing on a first straight line,
It has an inner peripheral surface that forms a side surface portion of a right circular cylinder having an axis existing on the first straight line and defines a second internal space, and an outer peripheral surface forming a side surface portion of the right circular cylinder having an axis existing on the first straight line. Then, with the outer peripheral surface of the first portion surrounded by the inner peripheral surface, the first portion is fitted into the second internal space so as to be able to advance and retreat in the direction parallel to the first straight line.
The second portion has an inner peripheral surface that forms a side surface portion of a right circular cylinder having an axis existing on the first straight line and defines a third internal space, and the outer peripheral surface of the second portion is surrounded by the inner peripheral surface. The third part, which fits inside the third internal space so that it can move forward and backward in the direction parallel to the first straight line,
With
The first portion constitutes the fitting portion of the first telescopic cylinder device according to any one of claims 1 to 3, the second portion constitutes the tubular portion of the first telescopic cylinder device, and / or the claim. A telescopic cylinder in which the fitting portion of the second telescopic cylinder device according to any one of items 1 to 3 is formed by the second portion, and the tubular portion of the second telescopic cylinder device is formed by the third portion. apparatus. The telescopic cylinder device according to claim 4, wherein the fitting in the first telescopic cylinder device or the fitting in the second telescopic cylinder device is attached to the second portion. The first part constitutes the fitting portion of the first telescopic cylinder device, the second part constitutes the tubular portion of the first telescopic cylinder device, and the second part constitutes the fitting portion of the second telescopic cylinder device. The telescopic cylinder device according to claim 5, wherein a third portion constitutes a tubular portion of the second telescopic cylinder device. The first telescopic cylinder device is the telescopic cylinder device according to claim 2.
The telescopic cylinder device according to claim 6, wherein the second telescopic cylinder device is the telescopic cylinder device according to claim 3. The telescopic cylinder according to any one of claims 5 to 7, wherein the fitting of the first telescopic cylinder device and the fitting of the second telescopic cylinder device are the ones attached to the second portion. apparatus.

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