JP4160803B2 - Cylinder lock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder lock used in furniture that can store articles such as storage tools, storages, and lockers.
[0002]
[Prior art]
Conventionally, a cylinder lock contributes to locking from an outer cylinder on a case, an inner cylinder that has a key hole and is rotatably incorporated in the outer cylinder, and a straight line perpendicular to the rotation axis of the inner cylinder by the rotation of the inner cylinder. A locking member from which the working end protrudes. The locking member is configured to project from the case on the rear side of the case opposite to the keyhole, and reciprocates in accordance with the rotation of the inner cylinder in a direction perpendicular to the central axis of the inner cylinder, and acts when locking. For example, the door is locked by locking the latch mechanism so that the door is not opened.
[0003]
[Problems to be solved by the invention]
However, in the case of such a configuration, the locking member protrudes in a direction perpendicular to the central axis of the inner cylinder, so when using the cylinder lock to lock the storage door, its mounting position and The direction was limited. In other words, the cylinder lock is incorporated into the latch mechanism so that the locking member is engaged with the latch mechanism of the door, or a lock mechanism is further provided near the mounting position of the latch mechanism, and the cylinder lock is incorporated into the lock mechanism and latched. The mechanism had to be locked, and it was not possible to attach it at a position away from the latch mechanism for convenience. Therefore, when the cylinder lock is disposed, the restriction is large and the degree of freedom in designing is low.
[0004]
In order to eliminate the above-mentioned restrictions, another member, for example, a link mechanism, on which the working end of the locking member acts is attached between the cylinder lock and the door locking mechanism, and locking is performed via the link mechanism. However, the mechanism is complicated.
[0005]
Accordingly, in view of the above problems, the present invention provides a cylinder lock that can reduce the restriction during mounting by operating the end of the locking member at a position away from the rotation axis of the inner cylinder. The purpose is to do.
[0006]
[Means for Solving the Problems]
That is, the cylinder lock of the present invention moves in conjunction with the rotation of the inner cylinder on the straight line that does not intersect the rotation axis of the case, the inner cylinder that is rotatably provided in the case with the key insertion hole. A locking member having a working end portion that contributes to locking, and the locking member can be moved in both directions on a straight line intersecting the rotation axis of the inner cylinder by rotation of the inner cylinder. A vertical piece projecting from the case extending from the base end portion in a direction substantially perpendicular to the bidirectional direction and the direction of the rotation axis , and a working end projecting substantially perpendicularly from the vertical piece portion And a case in which the case includes a guide portion that linearly guides the base end portion of the locking member when the inner cylinder is rotated.
[0007]
With such a configuration, the action end of the locking member moves on a straight line that does not intersect the rotation axis of the inner cylinder in conjunction with the rotation of the inner cylinder, so the direction orthogonal to the rotation axis of the inner cylinder There is no need to provide a mechanism for locking the door or the like. Therefore, it is possible to dispose in a relatively free position with respect to the locking mechanism, and it is possible to improve the degree of freedom in design.
[0008]
Further, the locking member can move in a bidirectional manner within a case on a straight line intersecting the rotation axis of the inner cylinder by the rotation of the inner cylinder, and the directions of the bidirectional and the rotation axis from the proximal end. since comprises a vertical piece portion protruding from the case extending in a substantially vertical direction, and a protruding piece portion projects substantially perpendicularly from the vertical piece portion comprising a working end relative to the working end of the locking member The portion can be arranged at a position separated from the rotation axis of the inner cylinder. Furthermore, since the protruding piece portion protrudes from the case, in the same locking member, when the locking member is mounted in the case, by changing the protruding direction of the protruding piece portion from the vertical piece portion, The relative position with respect to the inner cylinder can be changed. Moreover, since the case includes a guide portion that linearly guides the base end portion of the locking member when the inner cylinder is rotated, the working end portion of the locking member can be reciprocated accurately with a simple structure. it can.
[0009]
Further, it is preferable that the base end portion of the locking member is provided with a groove into which a protrusion provided so as to protrude from the rear end of the inner cylinder is slidably inserted.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0011]
As shown in FIG. 1, the cylinder lock 100 includes a case 110, an inner cylinder 120 that includes a key insertion hole 120 a and is rotatably accommodated in the case 110, and a straight line that does not intersect the rotation axis of the inner cylinder 120. A locking member 130 having a working end 133a that moves in conjunction with the rotation of the inner cylinder 120 and contributes to locking is provided. The inner cylinder 120 itself can be of a structure that is widely known in the field, and a detailed description thereof will be omitted. In the inner cylinder 120 of this embodiment, a protrusion 121 that engages with the locking member 130 protrudes from the rear end thereof.
[0012]
As shown in FIGS. 2 and 3, the case 110 includes a case block 111 and a back plate 112 and has a substantially rectangular parallelepiped shape. The case block 111 has a through hole 113 that houses the inner cylinder 120 on the front surface, and a guide portion 114 that guides the locking member 130 on the back surface side. The back plate 112 is removably attached to the back surface of the case block 111 with screws, and closes the guide portion 114 with the locking member 130 incorporated. The through-hole 113 has a structure corresponding to the inner cylinder 120, and prevents the inner cylinder 120 from rotating in a state where no key is inserted into the key insertion hole 120a of the inner cylinder. As the structure of the through-hole 113 itself, a structure known in the art may be used. The guide portion 114 guides the base end portion 131 of the locking member 130 on a straight line that intersects the rotation axis of the inner cylinder 120, and the groove bottom surface 114 a with which the lower edge of the base end portion 131 contacts, and the base end portion 131. A ceiling surface 114b with which the upper edge contacts, and a left side surface 114c and a right side surface 114d that define a reciprocating range of the locking member 130. Since the guide portion 114 is closed by the back plate 112, the locking member 130 does not fall off from the case block 111. When the back plate 112 is attached to the case block 111, a slit 115 is formed between the left side surface 114c and the right side surface 114d so that the vertical piece 132 of the locking member 130 protrudes. It is.
[0013]
As shown in FIGS. 4A and 4B, the locking member 130 is made of sheet metal, and is bidirectional on the straight line perpendicular to the rotation axis of the inner cylinder 120 by the rotation of the inner cylinder 120. A movable base end 131, a vertical piece 132 extending from the base end 131 in a substantially vertical direction, and a projecting piece having a working end 133a protruding from the vertical piece 132 in a substantially vertical direction. 133. The base end portion 131 has a substantially rectangular shape, and has a vertical groove 131a into which the protrusion 121 of the inner cylinder 120 is slidably inserted at a position from the center in the longitudinal direction. By the sliding movement of the projection 121 of the inner cylinder 120 along the vertical groove 131a, the rotational movement of the inner cylinder 120 is converted into a linear movement of the base end portion 133a that slides in both directions. The vertical piece 132 and the protruding piece 133 have a strip shape having substantially the same width. The vertical piece 132 is formed integrally with the base end 131 and extends substantially vertically from the upper edge of the base end 131. In this embodiment, the vertical piece 132 is half-width from the first piece 132a housed inside the case 110 and the center in the width direction of the first piece 132a continuously to the first piece 132a. About, the width direction center is comprised with the 2nd piece part 132b which biased to the action | operation edge part 133a side. The second piece 132b is biased toward the inner cylinder 120 by the thickness of the plate. A protruding piece 133 is formed integrally with the vertical piece 132.
[0014]
In the above, first, the inner cylinder 120 is fitted into the through hole 113 from the rear side of the case block 111 and set. Next, the base end portion 131 of the locking member 130 is fitted into the guide portion 114 of the case block 111. In this case, the protrusion 121 of the inner cylinder 120 is fitted into the vertical groove 131 a of the base end portion 131 of the locking member 130. Thereafter, the back plate 112 is fixed to the case block 111, and the cylinder lock 100 is assembled. In the assembled cylinder lock 100, the base end portion 131 of the locking member 130 is accommodated in the case 110 so as to be movable in both directions, and the second piece 132b of the vertical piece 132 of the locking member 130 is the case. It protrudes from a slit 115 formed in 110. Therefore, the working end portion 133 a of the protruding piece portion 133 protruding from the upper end of the vertical piece portion 132 is located on a straight line that does not intersect the rotation axis of the inner cylinder 120.
[0015]
In such a configuration, when a key is inserted into the key insertion hole 120a of the inner cylinder 120 and the inner cylinder 120 is rotated, the protrusion 121 pushes the vertical groove 131a in the rotation direction by the rotation of the inner cylinder 120. As a result, the base end portion 131 of the locking member 130 is guided by the guide portion 114 of the case block 111, that is, the base end portion 131 moves along the groove bottom surface 114a and the ceiling surface 114b, and intersects the rotation axis of the inner cylinder 120. Will move on a straight line. When the base end portion 131 moves linearly in this manner, the working end portion 133a of the locking member 130 protrudes from the vertical piece portion 132 because the protruding piece portion 133 is parallel to the base end portion 131. It is located on a straight line that does not intersect the rotation axis of the inner cylinder 120 by the one piece 133 and moves in the same direction as the base end 131 at a position away from the rotation axis of the inner cylinder 120.
[0016]
The cylinder lock 100 having such a configuration is used for, for example, a storage tool described below.
[0017]
As shown in FIGS. 5 and 6, the storage tool includes a storage tool body 1 that forms a storage space, and left and right doors 2 that are revolving doors that can be opened and closed by rotating the front opening of the storage tool body 1. 3, a handle 4 provided along the edge 3a on the free end side of the right door 3, and a pair of latch mechanisms 5 for mooring the right door 3 to a part of the storage device main body 1 in the vicinity of the upper and lower ends of the handle 4 And a cylinder lock 100 that restricts the movement of the handle 4.
[0018]
The storage device main body 1 forms a storage space having an open front by assembling a top plate 11, a bottom plate 12, a pair of left and right side plates 13 and a back plate 14 formed by bending a steel material, for example. It is what.
[0019]
The top plate 11 has a rectangular shape in plan view, and has an anchored portion 1a to which an anchoring claw 51 of the latch mechanism 5 described later can be anchored at the front end portion on the rear surface side (see FIG. 6). A bottom plate 12 that is substantially the same type as the top plate 11 is provided at a position opposite to the top plate 11, and has a moored portion 1 a at the front end on the front surface side like the top plate 11. The back plate 14 is fixed over the rear lower end of the bottom plate 12 and the rear upper end of the top plate 11. A side plate 13 is attached at a position where the side plate abuts against the side surface of the back plate 14.
[0020]
As shown in FIGS. 7 to 9 and the like, the right door 3 is a revolving door that rotates using a hinge mechanism H indicated by an imaginary line in FIG. 7 provided on the side plate 13 side that is a fixed end, and is mainly on the front side. The front frame member 31 that constitutes the rear frame member 32 and the rear frame member 32 that mainly constitutes the rear surface side are combined and molded using the resin mounting member A, and are rectangular in front view. The front frame member 31 has a length approximately half that of the front opening in the width direction and a length in the height direction, while the rear frame member 32 has a height and width dimension in the front frame. The height 31 and the width of the material 31 are set slightly smaller. The right door 3 is configured such that the edge on the free end side of the rear frame member 32 is substantially flush with the edge on the free end side of the front frame member 31. The left door 2 has the same configuration as the right door 3. And in this embodiment, the notch 32a for arrange | positioning a part of latch mechanism 5 is provided in the upper-lower-end part of the side surface by the side of the free end of the rear frame material 32 of the right door 3. As shown in FIG. An opening 32b through which the locking member 130 of the cylinder lock 100 passes is provided below the lower notch 32a.
[0021]
The handle 4 is formed by extruding a synthetic resin material, for example, and as shown in FIGS. 9 and 10, a recess 41 that opens to the front surface from the upper end to the lower end, and a depth direction and a width direction on one side surface. The inclined surface 42 extending simultaneously and the blindfold 43 are integrally formed. The recess 41 has a space for a standard adult fingertip to be sufficiently inserted so that a part of the recess 41 can be operated with the fingertip. The blindfold 43 conceals the space S provided between the side surface of the handle 4 and the side surface of the right door 3 so that the handle 4 does not interfere with the right door 3 when the handle 4 rotates. In the vicinity of the upper and lower ends of the pull handle 4 having such a configuration, a pair of latch mechanisms 5 for mooring the right door 3 to the housing body 1 are provided separately, and each latch mechanism 5 is synchronized by the pull handle 4 that rotates. Operatively linked. As shown in FIG. 10, a protruding member 6 having an inclined surface 61 substantially corresponding to the inclined surface 42 formed on the handle 4 is attached to the free end side of the left door 2.
[0022]
As shown in FIG. 11 to FIG. 13 and the like, the latch mechanism 5 is formed on the anchored portion 1a on a substantially U-shaped base member 54 having a pair of horizontal pieces 54b formed by bending the upper and lower sides facing each other. The mooring claw 51 moored to the mooring claw 51, the first rotating shaft 52 that pivotally supports the mooring claw 51, and the mooring claw 51 that is fixed to the first rotating shaft 52 are elastically attached to the container body 1 The biasing means 53 such as a torsion coil spring that biases, the transmission member 55 that is attached to the handle 4 and transmits the rotation operation of the handle 4 to the first rotating shaft 52, and the transmission member 55 that is integrally attached to the handle 4 are rotated. A second rotating shaft 56 that is supported as a unit is integrally attached to form a unit.
[0023]
The first rotating shaft 52 has a substantially quadrangular prism shape that is rotatably attached with its upper and lower ends penetrating the horizontal piece 54b of the base member 54, and presses against an upright wall 55a of a transmission member 55 described later. The member 52a is provided in part. The pressing member 52a is fixedly attached to the first rotating shaft and is integrally formed with the protrusion 52b. The torsion shown by an imaginary line in FIG. The biasing means 53 such as a coil spring is elastically biased in a direction in which the upright wall 55a of the transmission member 55 is pressed. As will be described later, an anchoring claw 51 is attached to the upper end portion of the first rotating shaft 52.
[0024]
The mooring claw 51 has a base end fixed to the upper end of the first rotating shaft 52 and is attached so that the tip protrudes rearward from the rear surface of the rear frame member 32. A claw body 51a protruding in the width direction of the right door 3 is formed.
[0025]
The second rotating shaft 56 has a substantially columnar shape, and has an upper and lower end portion penetrated through a horizontal piece 55b of the transmission member 5 described later, and an upper end portion is provided integrally with the base member 54 in a side view. While being supported by a substantially L-shaped bracket 54 c, the lower end portion is attached so as to penetrate the lower horizontal piece 54 b of the base member 54.
[0026]
The transmission member 55 forms a horizontal piece 55b at the upper and lower ends of the upright wall 55a by bending the upper and lower sides of a single steel material, and bends the front end of each horizontal piece 55b at a substantially right angle. An attachment piece 55c attached to the side surface of the handle 4 is integrally formed. In the state where the cylinder lock 100 is unlocked and the action end portion 133a of the locking member 130 is not engaged, the transmission member 55 is centered on the second rotation shaft 56 in conjunction with the rotation operation of the handle 4. The balance is set to operate.
[0027]
In this embodiment, the latch mechanism 5 unitized in this way is attached to the upper and lower ends of the right door 3.
[0028]
Specifically, first, in the vicinity of the upper end portion of the rear frame member 32, the upper end portion of the first rotating shaft 52 passes through the upper surface 32 a of the frame member 32, and the standing wall 54 a of the base member 54 and the upper horizontal portion The piece 54b is fixed to the inner side of the rear frame member 32 by welding or the like. Then, the base end portion of the mooring claw 51 is fixed and attached to the upper end portion of the first rotating shaft 52 protruding above the upper surface 32a of the rear frame member 32. In this state, the attachment piece 55c of the transmission member 55 is taken out from the edge portion 3a through the notch 32a of the rear frame member 32.
[0029]
Next, the latch mechanism 5 is attached to the vicinity of the lower end portion of the rear frame member 32 in the same manner as described above. In this case, it arrange | positions so that each 2nd rotating shaft 56 may be located on a substantially identical line. Then, the attachment piece 55c of the transmission member 55 and the handle 4 are tightly fixed using screws or the like.
[0030]
Next, the operation of the storage device having such a configuration will be described with reference to FIG.
[0031]
First, in a state in which the front opening of the storage space is closed, the cylinder lock 100 is unlocked, that is, the transmission member 55 is not engaged with the action end portion 133a of the locking member 130 of the cylinder lock 100 (see FIG. In FIG. 9, the locking member 130 is indicated by an imaginary line), and the action end portion 133 a of the locking member 130 is lowered to the lowest position. The position of the action end 133a is slightly below the lower edge of the transmission member 55, and does not contact the action end 133a even if the transmission member 55 rotates. Therefore, when the cylinder lock 100 is unlocked, the transmission member 55 is rotated by operating the handle 4. That is, when the pulling handle 4 is operated to be pulled forward using the concave portion 41 provided in the pulling handle 4 of the right door 3, the pulling handle 4 integrally rotates with the respective transmission members 55 provided at the upper and lower ends thereof. The shaft 56 is rotated in the direction of the arrow shown in FIG. Then, in conjunction with the rotation operation, each transmission member 55 performs a balance operation, and a force for pushing the pressing member 52a to the rear surface side of the right door 3 acts on the standing wall 55a of each transmission member 55. 52a rotates in the direction of the arrow shown in the figure in synchronization with the first rotating shaft 52 as a fulcrum. As a result, the anchoring claw 51 fixedly attached to the first rotating shaft 52 rotates together with the pressing member 52a, and simultaneously releases the anchoring state of the upper and lower anchoring claws 51 with respect to the anchored portion 1a (see FIG. (See (B)). Then, the right door 3 is continuously rotated using the hinge mechanism H so that the right half of the front opening of the storage space is opened, and then the hinge mechanism H is held with the free end of the left door 2. The left half of the front opening is opened, and the front opening of the storage space is fully opened.
[0032]
On the other hand, when the cylinder lock 100 is locked in a state where the front opening of the storage space is closed, the action end portion 133a of the locking member 130 enters between the base member 54 and the transmission member 55 (FIG. 9 shows the locking member). 130 is indicated by a solid line), and the rotation of the transmission member 55 is restricted.
[0033]
That is, when the cylinder lock 100 is unlocked from the unlocked state, the protrusion 121 of the inner cylinder 120 slides in the vertical groove 131 a of the base end portion 131 of the locking member 130 by the rotation of the inner cylinder 120. By moving, the base end portion 131 starts sliding in the guide portion 114, and the working end portion 133a of the locking member 130 moves upward. As described above, the action end 133a moves on a straight line that does not intersect with the rotation axis of the inner cylinder 120. In this embodiment, the action end 133a is moved at a position substantially parallel to the longitudinal direction of the handle 4. Is. Thereby, the action end part 133a of the locking member 130 enters between the base member 54 and the transmission member 55, and stops at that position. Therefore, even if the handle 4 is operated so that the right door 3 opens, the rotation of the transmission member 55 is restricted by the action end portion 133a of the locking member 130, so that the handle 4 does not rotate and the latch mechanism 5 is moored. The state is not released.
[0034]
As described above, according to the cylinder lock 100 of this embodiment, the action end portion 133a of the locking member 130 moves, that is, reciprocates at a position away from the rotation axis of the inner cylinder 120. A lock 100 can be attached.
[0035]
The present invention is not limited to the embodiment described in detail above.
[0036]
For example, by making the base end of the locking member symmetrical with respect to the vertical piece, a cylinder lock with a different position of the working end can be realized with the same locking member. Specifically, as shown in FIGS. 14 to 16, the rear surface of the case block 211 of the case 210 that includes the case block 211 and the back plate 212 and can rotatably accommodate the inner cylinder 120 is arranged in the lateral direction. A guide portion 214 that allows the locking member 230 to move is formed. With respect to such a guide portion 214, the locking member 230 includes a base end portion 231 having a symmetrical shape, a vertical piece portion 232 extending substantially vertically from the vicinity of one end portion of the base end portion 231, and The projecting piece 233 projects substantially vertically from the vertical piece 232. The proximal end portion 231 of the locking member 230 has a longitudinal groove 231a that engages with the protrusion 121 of the inner cylinder 120 at a substantially central portion in the longitudinal direction thereof, and more stably guides the proximal end portion 231 by the guide portion 214. It has a lateral groove 231b. The lateral groove 231b is formed on the same line symmetrically with respect to the center line in the longitudinal direction of the base end portion 231. Corresponding to the lateral groove 231b, lateral protrusions 215 are provided on both sides of the through hole 213 into which the inner cylinder 120 on the rear surface of the case 210 is inserted.
[0037]
With such a configuration, when the locking member 230 is incorporated into the case 210, the working end with respect to the inner cylinder 120 can be used by changing the direction of the protruding piece 233 to use the same case 210 and the locking member 230. It becomes possible to produce the cylinder lock 200 in which the position of the part 233a is different. As described above, the locking member 230 has a base end portion 231 that is symmetrical. For this reason, when the locking member 230 is assembled, both the case where the protruding piece 233 is located on the right side and the case where it is located on the left side can be selected.
[0038]
Therefore, for example, in the storage device of the above-described embodiment, the present invention can be applied to the case where the cylinder lock 200 is attached to a position other than the lower side of the handle 4, that is, the upper position. Specifically, in the same cylinder lock 200 attached to the lower side, if the back plate 212 is removed, the front and back sides of the locking member 230 are changed, and the locking member 230 is incorporated into the case 210, the working end of the locking member 230 is obtained. The portion 233a faces downward and can be changed to the cylinder lock 200 that locks the transmission member 55 of the upper latch mechanism 5. Thus, in the cylinder lock 200 in this example, the base end portion 231 of the locking member 230 has a symmetrical shape, and the guide portion 214 portion of the case block 211 of the case 210 has a symmetrical shape. Since the same locking member 230 is used, the working end portion 233a with a different position relative to the inner cylinder 120 can be easily created. Therefore, the mounting position of furniture such as a storage tool can be changed relatively easily, and the degree of freedom in designing furniture can be improved.
[0039]
In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0040]
【The invention's effect】
As described above, according to the present invention, the action end of the locking member moves on a straight line that does not intersect with the rotation axis of the inner cylinder in conjunction with the rotation of the inner cylinder, so that it is orthogonal to the rotation axis of the inner cylinder. It is possible to lock the door without arranging a mechanism for locking the door in the direction. Therefore, it is possible to dispose at a relatively free position with respect to the locking mechanism, and the degree of freedom in design can be improved.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a cylinder lock according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the embodiment.
FIG. 3 is a rear view of the embodiment with a back plate removed.
FIG. 4 is a front view and a right side view of the locking member of the embodiment.
FIG. 5 is an overall perspective view of a storage tool in which the embodiment is used.
FIG. 6 is a perspective view showing the main part with a part of the storage tool omitted when the right door is opened.
FIG. 7 is a perspective view of a right door of the storage tool.
FIG. 8 is an exploded perspective view of the right door of the storage device.
FIG. 9 is a front view of the right door of the storage device with a part thereof omitted.
FIG. 10 is a main part plan view schematically showing the left and right doors in the closed state. FIG. 11 is an enlarged front view of the main part of the latch mechanism of the storage tool.
FIG. 12 is an enlarged side view of the main part.
FIG. 13 is an operation explanatory view of the latch mechanism of the storage device.
FIG. 14 is an overall perspective view of a cylinder lock according to another embodiment of the present invention.
FIG. 15 is an exploded perspective view of the other embodiment.
FIG. 16 is a rear view of the other embodiment with the back plate removed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Cylinder lock 110 ... Case 120a ... Key insertion hole 130 ... Locking member 133a ... Working end part

Claims (2)

A case, an inner cylinder that is provided with a key insertion hole and is rotatably accommodated in the case, and a working end that contributes to locking by moving in conjunction with the rotation of the inner cylinder on a straight line that does not intersect the rotation axis of the inner cylinder it and a locking member having a locking member, wherein a straight line which intersects the rotational axis of the inner cylinder by the rotation of the inner cylinder and the proximal end can move in both directions in the case, from its proximal end A vertical piece projecting from the case extending in both directions and in a direction substantially perpendicular to the direction of the rotation axis, and a projecting piece comprising a working end projecting substantially perpendicularly from the vertical piece, A cylinder lock, wherein the case includes a guide portion that linearly guides the proximal end portion of the locking member when the inner cylinder is rotated. 2. The cylinder lock according to claim 1 , wherein the base end portion of the locking member is provided with a groove into which a protrusion provided to protrude from the rear end of the inner cylinder is slidably inserted .

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