JP6553135B2 - Lifting device for image display device - Google Patents

Description

  The present invention relates to an elevating device for detachably installing an image display device represented by an electronic whiteboard or an electronic blackboard on an installation target such as an installation stand and supporting the image display device so as to be movable up and down.

  Conventionally, the image display apparatus as described above is used for a participant to write information under a situation where information should be presented to a large number of participants in a meeting, a class, or the like. Also, the image display device of the prior art may be used to visually display the existing image in a situation where a large number of participants should be allowed to view the existing image.

In many cases, the image display apparatus is usually used by being installed on a movable installation stand. In this case, it is desirable that the installation height of the image display device with respect to the installation target can be adjusted depending on the size of the place of use, the number of participants, and the like. As a prior art which enables adjustment of the installation height of an image display apparatus, the following examples can be mentioned, for example.
(A) Several stages of screw fixing portions are formed on an attachment base provided integrally with the installation stand, and one of the screw fixing portions is selected and the image display device is attached and fixed to the attachment base with screws.
(B) A trapezoidal screw is integrally mounted on the installation stand, and a plate to which the image display device is fixed is connected to a lifting plate that moves up and down by the rotation of the trapezoidal screw.
(C) A mounting base on which the image display device is fixed to the installation stand is integrally provided, and the legs of the installation stand can be expanded and contracted vertically.

  As another related prior art, Patent Document 1 describes a screen position adjusting device of a wall-mounted television. The screen position adjusting device in Patent Document 1 includes a fixed plate fixedly installed on a wall, a lift plate having both ends coupled to a slider of the fixed plate and having a television set on the front, and a lift plate And an elevating operation unit that elevates the fixed plate up and down.

JP 2007-259552 A

  By the way, in the case of the prior art (a), since the image display device is screw-fixed by selecting one of several stages of screw-fixing portions, screw fixing work is required every time the height is adjusted. In addition, you can not fix at any position other than the screw fixing part. In the case of (b), the elevating mechanism is substantially integrated with the installation stand, and the image display apparatus that can be installed on the installation stand is limited, and the image display apparatus can be various in weight, size, etc. It is not possible to respond sufficiently. Furthermore, in the case of (c), the legs of the installation stand can expand and contract vertically, but in the existing installation stand in which such legs do not have an expansion and contraction function, the vertical position adjustment of the image display device can not be performed.

In the technique disclosed in Patent Document 1, the installation target is a wall, and once installed, the height can be adjusted, but it is not easy to change to another installation position or another installation target. Moreover, in Patent Document 1, the installation object is a television device, and the image display device represented by the electronic white board or the electronic blackboard as described above is not intended.

  An object of the present invention is to provide a lifting device of an image display device which can be easily attached to an existing installation stand and can quickly lift the weight even if the image display device is heavy.

The present invention is a lifting device for supporting an image display device so as to be able to move up and down with respect to an installation target,
An attachment base detachably attached to the installation object;
An elevating mechanism that is provided in the mounting base and the image display device and raises and lowers the image display device relative to the mounting base;
A rotation driving unit provided on the mounting base;
An ascending / descending body assembled to the attachment base so as to be movable up and down, and supporting the image display device;
A guide portion for vertically guiding the elevating body when the elevating body is moved up and down;
An elevating device for an image display device, comprising: an elevating mechanism including a drive transmission unit that moves up and down while guiding the elevating body in the vertical direction by the guide unit by a rotational driving force of the rotational drive unit. It is.

In the present invention, the rotational drive unit includes a horizontal drive shaft,
The drive transmission unit is
A worm gear fixed coaxially to the horizontal drive shaft;
A worm wheel rotatably mounted on the mounting base around a horizontal axis orthogonal to the horizontal drive shaft, and meshed with the worm gear;
A sprocket provided coaxially with the worm wheel;
An idle sprocket disposed below the sprocket on the mounting base and rotatably mounted about an axis parallel to the axis of the worm wheel;
And a chain which is wound around the sprocket and the idle sprocket and coupled to the elevating body,
The guide portion includes a slide shaft attached to a horizontal central portion of the mounting base and extending vertically perpendicular to the horizontal drive shaft,
The elevating body is slidably held on the slide shaft.

Furthermore, according to the present invention, the worm wheel is provided with a coupling gear coaxially and integrally.
The mounting base is
A driven connection gear meshing with the connection gear;
A driven sprocket provided coaxially integrally with the driven coupling gear;
A plurality of driven idle sprockets,
The driven side chain coupled to the elevating body and wound on the driven side sprocket and the plurality of driven side idle sprockets may be symmetrically provided with the axis of the slide shaft as a symmetry axis.

In the present invention, the rotational drive unit includes a horizontal drive shaft,
The drive transmission unit is
A vertical drive axis orthogonal to the horizontal drive axis;
A pair of orthogonal gears provided between the horizontal drive shaft and the vertical drive shaft and transmitting axial rotation of the horizontal drive shaft to the vertical drive shaft;
A worm gear fixed coaxially with the vertical drive shaft;
A worm wheel that is rotatably attached to the mounting base body about an axis of a horizontal support shaft orthogonal to the horizontal drive shaft, and meshes with the worm gear;
A sprocket provided coaxially with the worm wheel;
An idle sprocket that is disposed below the sprocket on the mounting base and is rotatably mounted about an axis parallel to the axis of the worm wheel;
A chain coupled to the elevator body and wound around the sprocket and the idle sprocket;
The guide portion includes a slide shaft mounted along a vertical direction perpendicular to the horizontal drive shaft at a horizontal center of the mounting base.
The elevating body is characterized in that it is slidably held by the slide shaft.

Furthermore, in the present invention, the mounting base includes
A second worm wheel meshing with the worm gear;
A second sprocket coaxially integral with the second worm wheel;
With multiple second idle sprockets,
A second chain coupled to the elevating body and wound around the second sprocket and the second idle sprocket is characterized by being symmetrically provided with an axis of the slide shaft as a symmetry axis. I assume.

  Further, according to the present invention, the elevating body includes a first elevating plate for attaching and supporting the image display device, and a second elevating plate fixed to the first elevating plate and to which the chain is coupled. It is characterized by.

Furthermore, in the present invention, the rotational drive unit includes a horizontal drive shaft,
The drive transmission unit is
A screw shaft that extends vertically in the direction perpendicular to the horizontal drive shaft and is held vertically so as to be axially rotatable at a horizontal central portion of the mounting base;
A screw nut integrally provided on the elevating body and screwed to the screw shaft;
A pair of orthogonal gears provided between the horizontal drive shaft and the screw shaft and transmitting the shaft rotation of the horizontal drive shaft to the screw shaft;
The guide portion is configured to guide the elevating body in the vertical direction along the screw shaft.

In the present invention, the lifting body includes a lifting plate for attaching and supporting the image display device,
The elevating plate is driven to move up and down by relative displacement of the screw nut with respect to the screw shaft accompanying rotation of the screw shaft.

  Furthermore, the present invention is characterized in that a handle shaft of an operating handle is connected to the rotational drive unit, and the rotational drive unit is rotationally driven by a rotational operation of the operating handle.

  Further, the present invention is characterized in that an output shaft of an electric motor is connected to the rotational drive unit, and the rotational drive unit is rotationally driven by rotational power of the electric motor.

As described above, according to the present invention, the elevating device is detachably attached to the installation target by the attachment base. The elevating body is assembled to the mounting base body via an elevating mechanism so as to be movable up and down, and supports the image display device so as to be movable up and down with respect to the installation target. The elevating mechanism includes a rotation driving unit provided on the mounting base, a drive transmission unit for transmitting the rotation driving force of the rotation driving unit so as to displace the elevating body in the vertical direction, And a guide portion that guides the vertical displacement of the elevating body.

  As a result, the image display apparatus supported by the elevating body can move up and down with respect to the installation subject via the elevating mechanism. Therefore, the image display device can be appropriately adjusted to an arbitrary height position that is easy for the participant to see according to the size of the place of use, the number of participants, and the like. In addition, since the elevating mechanism is configured as described above, the elevating body can be properly and smoothly moved up and down. Furthermore, since the lifting device is removably attached to the installation target by the mounting base, it can be applied to the existing installation target.

  According to the invention, the rotational drive unit includes a horizontal drive shaft. A worm gear fixed coaxially to the horizontal drive shaft; and a worm gear mounted on the mounting base so as to be rotatable about an axis of a support perpendicular to the horizontal drive shaft and meshing with the worm gear. The wheel includes a sprocket coaxially integrated with the worm wheel, and a chain wound around a plurality of idle sprockets attached to the attachment base so as to be axially rotatable, and both ends coupled to the lifting body. In addition, the guide portion includes a slide shaft attached to a horizontal central portion of the mounting base along a vertical direction orthogonal to the horizontal drive axis, and the elevating body is along the longitudinal direction of the slide shaft. And is slidable.

  Thereby, the axial rotation of the horizontal drive shaft is converted by the engagement of the worm gear and the worm wheel into rotation about the axis of the support shaft orthogonal to the horizontal drive shaft of the sprocket. Since the chain wound around the sprocket and the plurality of idle sprockets is coupled to the elevating body, the elevating body is moved up and down by the upward / downward displacement operation of the chain accompanying the rotation of the sprocket. Further, since the elevating body is moved up and down along the longitudinal direction while being held by the slide shaft, the elevating body can be smoothly moved up and down even if the image display apparatus supported by the elevating body is heavy. Can be made.

  Still further, according to the present invention, the worm wheel has a coaxial integral coupling gear. Further, a driven side connecting gear meshing with the connecting gear, a driven side sprocket coaxially integrated with the driven side connecting gear, and a plurality of driven side idle sprockets, with the axis of the slide shaft as the axis of symmetry, the connecting gear and the idle sprocket, The mounting base is provided symmetrically. And, a driven side chain whose both ends are connected to the elevating body is wound around the driven side sprocket and the plurality of driven side idle sprockets.

  As a result, the rotation of the worm wheel and the sprocket about the axis of the support perpendicular to the horizontal drive shaft is transmitted to the driven side connecting gear and the driven side sprocket via the connecting gear. This rotation causes the driven side chain wound around the driven side sprocket and the plurality of driven side idle sprockets to move up and down, and by this up and down displacement operation, the elevating body coupled at both ends of the driven side chain is moved up and down. Move up and down. The raising and lowering of the elevating body is performed by the cooperative action of the driven side chain and the chain, and both the chains are provided in a symmetrical relationship with the axis of the slide shaft as the axis of symmetry. The rotational power is uniformly transmitted to the left and right, and even if the image display device attached to the elevating body is a heavy one, it is moved up and down in a balanced manner in the left and right.

Further, according to the present invention, the rotational drive unit includes a horizontal drive shaft. The drive transmission unit includes a vertical drive shaft that is orthogonal to the horizontal drive shaft, and a screw gear that is interposed between the horizontal drive shaft and the vertical drive shaft to transmit the shaft rotation of the horizontal drive shaft to the shaft rotation of the vertical drive shaft. Orthogonal gear pairs. The drive transmission unit may be a worm gear fixed coaxially to the vertical drive shaft, and a worm wheel rotatably mounted on the mounting base around an axis of a support shaft orthogonal to the horizontal drive shaft and meshed with the worm gear. And. Further, the drive transmission unit includes a sprocket coaxial with the worm wheel and a plurality of idle sprockets rotatably mounted on the mounting base, and a chain having both ends coupled to the elevating body. Be done.

  Thus, the shaft rotation of the horizontal drive shaft is transmitted to the shaft rotation of the vertical drive shaft via the orthogonal gear pair. The rotation of the vertical drive shaft causes the worm wheel and sprocket rotatably mounted on the mounting base via the worm gear to rotate about the axis of the support shaft. Since a chain whose both ends are connected to the elevator is wound around the sprocket and the idle sprocket, the chain is moved up and down by rotation around the axis of the worm wheel and the support shaft of the sprocket. By operation, the elevator moves up and down. In addition, the guide portion includes a slide shaft attached to a horizontal central portion of the attachment base along a vertical direction orthogonal to the horizontal drive shaft, and the lifting body extends along the longitudinal direction of the slide shaft. And is slidable. Accordingly, the lifting and lowering body is lifted and lowered along the longitudinal direction while being held by the slide shaft, and even if the image display device supported by the lifting and lowering body is heavy, the lifting and lowering body can be smoothly lifted and lowered. be able to.

  Furthermore, according to the present invention, a second worm wheel meshing with the worm gear, a second sprocket coaxially integrated with the second worm wheel, and a plurality of second idle sprockets, the axis of the slide shaft being the axis of symmetry, the worm The mounting base is provided symmetrically with the wheel, the sprocket and the plurality of idle sprockets. The second sprocket and the plurality of second idle sprockets are wound around a second chain having both ends coupled to the elevating body.

  Thereby, the axial rotation of the vertical drive shaft is also transmitted to the second worm wheel and the second sprocket, and the second worm wheel and the second sprocket rotate around the axis of the support shaft. Since the second chain having both ends coupled to the lift body is wound around the second sprocket and the second idle sprocket, the axial rotation of the vertical drive shaft causes the chain and the second chain to cooperate with each other. To move up and down. The cooperative raising and lowering displacement movement of the chain and the second chain raises and lowers the raising and lowering body along the longitudinal direction while being held by the slide shaft. Therefore, even if the image display apparatus supported by the elevating body has a large weight, it can be moved up and down smoothly. Moreover, since the chain and the second chain and the respective drive transmission systems are provided in a symmetrical relationship with the axis of the slide shaft as the symmetry axis, the rotational power of the horizontal drive shaft is evenly transmitted to the left and right, Even if the image display device attached to the elevating body is heavy, it can be moved up and down in a well-balanced manner.

  According to the invention, the lifting body is integrated with the first lifting plate for mounting and supporting the image display device, and the first lifting plate, and the second end to which both ends of the chain are coupled. And a lifting plate.

  As a result, the image display apparatus supported by the first lift plate moves up and down according to the elevating and displacing operation of the chain whose both ends are coupled to the second lift plate integrated with the first lift plate.

Still further in accordance with the present invention, the rotary drive includes a horizontal drive shaft. The drive transmission portion is perpendicular to the horizontal drive shaft and is held in a central portion in the horizontal direction of the mounting base so as to be axially rotatable. The drive transmission portion is provided integrally with the lifting body and is screwed to the screw shaft. A screw nut that is interposed between the horizontal drive shaft and the screw shaft, and an orthogonal gear pair that includes a screw gear that transmits the shaft rotation of the horizontal drive shaft to the shaft rotation of the screw shaft. In this case, the screw shaft doubles as a part of the guide portion.

  As a result, the shaft rotation of the horizontal drive shaft is drivingly transmitted to the shaft rotation of the screw shaft rotatably held at the horizontal center of the mounting base via the orthogonal gear pair. Since the elevating body is provided with a screw nut screwed to the screw shaft, the elevating body is along the longitudinal direction of the screw shaft by screwing / reversing action of the screw nut accompanying the shaft rotation of the screw shaft. Relative displacement. By the relative displacement operation of the lifting body, the image display device supported by the lifting body moves up and down. Further, even if the image display device is heavy, the screw shaft and the screw nut can be screwed up and down smoothly, and the screw shaft also serves as a part of the guide portion, so that the number of parts can be reduced. can do.

  Further, according to the present invention, the elevating body includes an elevating plate for mounting and supporting the image display device, and the elevating plate has the screw nut, and the screw nut accompanying the shaft rotation of the screw shaft. It can be moved up and down along the longitudinal direction of the screw shaft by relative displacement of the screw shaft.

  As a result, the image display device attached to and supported by the elevating plate smoothly moves up and down along the longitudinal direction of the screw shaft.

  Furthermore, according to the present invention, a handle shaft of an operating handle is connected to the rotary drive unit, and the rotary drive unit is rotationally driven by a rotation operation of the operating handle.

  By this, if the operation handle is manually operated, the elevation operation of the image display device can be easily implemented. Moreover, the weight increase and cost increase of the lifting device itself can be suppressed.

  Further, according to the present invention, an output shaft of an electric motor is connected to the rotational drive unit, and rotational drive of the rotational drive unit is performed by rotational power of the electric motor.

  As a result, by turning on the switch of the electric motor, lifting and lowering of the image display device can be easily performed without labor. This is particularly beneficial when the image display apparatus is heavy.

It is a schematic perspective view which shows the state which installs the image display apparatus 2 in the installation stand 3 using the raising / lowering apparatus 1 which is 1st Embodiment of this invention. FIG. 2 is a front view showing an internal configuration of the lifting device 1. 3 is a partially broken plan view showing the internal configuration of the lifting device 1. FIG. It is the right view which fractured | ruptured partially which showed the internal structure of the raising / lowering apparatus. FIG. 5A is a plan view of the first lifting plate 4, and FIG. 5B is a front view of the first lifting plate 4. The 2nd raising / lowering plate 5 which comprises the raising / lowering apparatus 1 of this embodiment is shown, FIG. 6 (A) is a top view of the 2nd raising / lowering plate 5, FIG.6 (B) is a front view of the 2nd raising / lowering plate 5. FIG. is there. It is a front view which shows the internal structure of the upper half part of 1 A of raising / lowering apparatuses which are the 2nd Embodiment of this invention. It is a front view which shows the internal structure of the raising / lowering apparatus 1B which is 3rd Embodiment of this invention. It is a front view which shows the internal structure of the upper half part of 1 C of raising / lowering devices which are 4th Embodiment of this invention.

  FIG. 1 is a schematic perspective view showing a state in which an image display device 2 is installed on an installation stand 3 using the lifting device 1 according to the first embodiment of the present invention. The lifting device 1 of the present embodiment is attached to a mounting base 6 that is detachably attached to an installation stand 3 as an installation target, and is assembled to the mounting base 6 so as to be movable up and down via a lifting mechanism that will be described later. An elevating body 7 supporting the image display device 2 is provided.

  The installation stand 3 is configured to be able to install an image display device 2 typified by an electronic whiteboard or an electronic blackboard, and has a pair of support pillars 3b and 3b having legs 3a that can be moved on the floor by casters (not shown). Between (in this embodiment, a plurality of (three in this embodiment)) horizontal bars 3c, 3d, and 3e are vertically installed in parallel.

  On the back surface of the mounting base 6 constituting the lifting / lowering device 1, connecting fittings 8 and 9 are fixedly attached to be fixed to at least one of the three horizontal bars 3 c, 3 d and 3 e (described later). (See also FIGS. 3 and 4). In addition, the image display device 2 is attached to and supported by a screw (not shown) or the like on a first elevating plate 4 described later constituting the elevating body 7 at substantially the center of the back surface of the image display device 2. The mounting plate 2a is fixed.

  The lifting apparatus 1 of the present embodiment will be described in more detail with reference also to FIGS. 2 is a front view showing the internal configuration of the lifting apparatus 1, FIG. 3 is a partially broken plan view showing the internal configuration of the lifting apparatus 1, and FIG. 4 is a partially broken view showing the internal configuration of the lifting apparatus 1. It is a right view. 5 shows the first lifting plate 4 of the lifting device 1, FIG. 5 (A) is a plan view of the first lifting plate 4, FIG. 5 (B) is a front view of the first lifting plate 4, and 6 shows the second lifting plate 5 of the lifting device 1, FIG. 6 (A) is a plan view of the second lifting plate 5, and FIG. 6 (B) is a front view of the second lifting plate 5. As shown in FIG.

  The lifting body 7 includes a first lifting plate 4 and a second lifting plate 5. The first lift plate 4 and the second lift plate 5 are assembled so as to be able to be lifted and lowered via the lift mechanism 10 with respect to the flat box-shaped mounting base 6 in a state integrated in parallel by coupling means not shown. ing. As described above, the first lifting plate 4 is integrally fixed to the image display device 2 via the mounting plate 2a and functions to support the image display device 2, and the second lifting plate 5 is to be described later Further, it is connected to the elevating mechanism 10 and is driven up and down.

  The elevating mechanism 10 includes a rotation driving unit 11 provided on the mounting base 6 and a drive transmission unit 12 for transmitting the rotation driving force of the rotation driving unit 11 so as to displace the elevating body 7 in the vertical direction. And a guide portion 13 for guiding the displacement of the elevating body 7 in the vertical direction.

  In the present embodiment, the guide portion 13 is realized by a spline shaft, which may be hereinafter referred to as a “slide shaft 13”. Further, the rotary drive unit 11 includes a horizontal drive shaft 15 horizontally supported by the mounting base 6 so as to be axially rotatable.

  The horizontal drive shaft 15 is connected to one end of a handle shaft 16 that is rotatably supported by the mounting base 6 and a driving auxiliary plate 14 that protrudes from one side of the mounting base 6. An operation handle 17 is attached to the other end of the handle shaft 16.

The drive transmission unit 12 includes a worm gear 18 coaxially fixed to the horizontal drive shaft 15;
A worm wheel 20 rotatably mounted about the axis of a support shaft 19 orthogonal to the horizontal drive shaft 15 with respect to the mounting base 6 and meshing with the worm gear 18; and a sprocket 21 coaxially integral with the worm wheel 20; And a plurality (two in this embodiment) of idle sprockets 22 and 23 attached to the attachment base 6 so as to be rotatable.

  Further, the drive transmission unit 12 includes an end chain 24 that is wound around the sprocket 21 and the idle sprockets 22 and 23 and has both ends coupled to the second elevating plate 5 of the elevating body 7. Yes.

  In FIG. 1, illustration of the drive assist plate 14, the handle shaft 16, and the operation handle 17 is omitted.

  Further, in this embodiment, the worm wheel 20 has a coaxially integrated connecting gear 25, and the driven side connecting gear 26 that meshes with the connecting gear 25 rotates around the axis of the support shaft 26 a with respect to the mounting base 6. Installed as possible. The driven side coupling gear 26 is provided with a coaxial side driven sprocket 27. The driven-side connection gear 26, the driven-side sprocket 27, and the two driven-side idle sprockets 28, 29 are symmetrical with the connection gear 25, the sprocket 21, and the idle sprockets 22, 23 with the axis of the slide shaft 13 as the axis of symmetry. That is, the mounting base 6 is provided on the mounting base 6 in plane symmetry with respect to a virtual one plane including the target axis.

  The driven side end chain 30 having both ends coupled to the second elevating plate 5 is wound around the driven side sprocket 27 and the driven side idle sprockets 28 and 29. The gear box 31 is provided on the back of the mounting base 6 and accommodates the gears. The horizontal drive shaft 15 is supported by a chassis 32 in the gear box 31 via a bearing so that the shaft can rotate, and the support shafts 19 and 26a are supported by the chassis 32 and the mounting base 6 so that the shaft can rotate. Has been.

  In FIG. 3, the driven sprocket 27, the driven idle sprockets 28 and 29, and the driven end chain 30 are not shown. Further, in FIG. 4, illustration of each gear in the gear box 31 is omitted.

  The first lift plate 4 is made of a metal plate, and is formed into a shape as shown in FIG. 5 by sheet metal processing. That is, a base 40 whose central portion is recessed toward the mounting base 6, a pair of wings 41 extending symmetrically on both sides of the base 40, and a bending from the upper and lower ends of the base 40 toward the mounting base 6. And a pair of tongues 42 formed.

  The base 40 is provided in parallel and integrally with the second elevating plate 5 by a coupling means (not shown). The wing portion 41 is provided with a plurality of screw holes 43 for mounting and fixing the mounting plate 2a (see FIG. 1) of the image display device 2 with a screw (not shown).

  At approximately the center of the tongue 42, spline bearings 33, 34 (FIG. 2, as shown in FIG. 2, which hold the slide shaft 13 relatively slidable along its longitudinal direction and prevented from rotating about its axis) A through-hole 44 that can be integrally fitted is formed.

  The second lifting plate 5 is also made of a metal plate, and is formed in a shape as shown in FIG. 6 by sheet metal processing. That is, a horizontally long base 50 integrated with the base 40 of the first elevating plate 4 by a coupling means (not shown), and a pair of left and right bent portions symmetrically bent toward the mounting base 6 from both lateral ends of the base 50. It includes a bowl-shaped piece portion 51 and a pair of tongue-like portions 52 that are bent from the upper and lower ends of the base portion 50 toward the mounting base 6.

  Each saddle-shaped piece 51 is formed with two dharma holes 53 each having a large-diameter portion and a small-diameter portion in which both end portions of the end chains 24 and 30 can be detachably attached. In each end of the end chains 24, 30, a large diameter portion smaller in diameter than the large diameter portion and larger in diameter larger than the small diameter portion and a small diameter portion smaller in diameter than the small diameter portion are coaxially integrated. The couplers 24a, 24b, 30a and 30b (see FIG. 2) are provided.

  By inserting each large-diameter portion of the couplers 24a, 24b, 30a, and 30b into the large-diameter portion of the Dharma hole 53 and then shifting to the small-diameter portion side to lock the small-diameter portion to the small-diameter portion. The both end portions of the end chain 24, 30 are coupled to the second elevating plate 5 via the connecting devices 24a, 24b, 30a, 30b. The slide shaft 13 is loosely inserted at a substantially central portion of the tongue 52 and in the same position as the through hole 44 of the first lift plate 4 in a coupled state with the first lift plate 4. An obtained through hole 54 is provided.

  The slide shaft 13 is a spline shaft as described above, and is inserted into the insertion hole 54 of the second elevating plate 5 and is fitted to the spline bearings 33, 34 integrated with the first elevating plate 4. In the joined state, the mounting base 6 is fixed vertically to the upper and lower sides of the mounting base 6. As a result, the elevating body 7 including the first elevating plate 4 and the second elevating plate 5 is vertically displaced (elevated) using the slide shaft 13 as a guide in the vertical direction (vertical direction) along the longitudinal direction of the slide shaft 13 ) It is possible.

  The mounting base 6 is formed in a flat box shape in which one surface is opened by processing a metal plate. Two types of protective covers 35 and 36 are attached to the opening to close the opening. More specifically, in a state where the lifting mechanism 10 and the lifting body 7 are assembled to the mounting base 6, the wing portions 41 of the first lifting plate 4 protrude to the front side on both sides of the opening, and the base portion A pair of first covers 35 having a width not interfering with 40 is attached to the mounting base 6.

  Further, the second cover 36 is mounted on the upper and lower end sides of the mounting base 6 at the center of the opening in alignment with the recess of the base 40 of the first lift plate 4. In the mounted state of the first cover 35 and the second cover 36, when the opening of the mounting base 6 is closed by the covers 35 and 36 in a front view, the wings 41 of the first lift plate 4 2 Both sides of the cover 36 are viewed in the exposed state on the front surface of the first cover 35. Then, the elevating body 7 can be vertically displaced without interfering with the covers 35 and 36. In FIG. 3, the right first cover 35 is not shown.

  On both sides of the back surface of the mounting base 6, two hook-shaped connecting fittings 8, 80, 9, 90 fixed to the upper two horizontal bars 3 c, 3 d of the installation stand 3 are fixed. Has been. On the side portions of the hook-shaped connection fittings 8, 80, 9, 90, connection auxiliary fittings 8 a, 9 a, 80 a, 90 a made of angle members fixed to the upper surfaces of the horizontal bars 3 c, 3 d with screws or the like are fixed. It is installed. Further, angle type connection fittings 81 and 91 which can be fixed by screws or the like in a state of being in contact with the upper surface of the lowermost horizontal bar 3e below the hook type connection fittings 80 and 90 on the back surface of the mounting base 6. Is fixed. The connection fittings 81 and 91 may be realized by a shape steel material such as L-shaped steel.

  The lifting device 1 of the present embodiment is configured to be installed on the three horizontal bars 3c, 3d, and 3e of the installation stand 3 by such a connecting bracket, but the structure of the connecting bracket is shown in the figure. A structure that conforms to the structure of the installation stand 3 is appropriately adopted. Moreover, it is also possible to form a plurality of connection fittings along the vertical direction in one angle member, or to make the height adjustment of the connection fittings individually.

  The operation of the lifting device 1 configured as described above will be described. As described above, the image display device 2 is supported by the wing portion 41 of the first lift plate 4 via the mounting plate 2 a, and the lift device 1 is installed on the installation stand 3. Thereby, the image display device 2 is installed on the installation stand 3 via the lifting device 1.

  When the height of the image display device 2 needs to be adjusted, the operation handle 17 is manually rotated and the horizontal drive shaft 15 is rotated through the handle shaft 16. The rotation of the horizontal drive shaft 15 is transmitted from the worm gear 18 to the rotation around the axis of the support shaft 19 of the worm wheel 20. As a result, the sprocket 21 integrated with the worm wheel 20 is also rotated around the axis of the support shaft 19, and the end chain 24 wound around the sprocket 21 and the idle sprockets 22, 23 is moved up and down.

  Further, the rotation of the worm wheel 20 is transmitted to the rotation of the driven sprocket 27 around the axis of the support shaft 26 a by the meshing of the connection gears 25 and 26. Along with this, the driven-side endless chain 30 wound around the driven-side sprocket 27 and the driven-side idle sprockets 28 and 29 is moved up and down. The up-and-down displacement operation of both end chains 24 and 30 acts on the second up-and-down plate 5 to which both ends of the end-chained chains 24 and 30 are coupled, and the first up-and-down plate 5 and the first up-and-down plate 5 integrated therewith. An elevating body 7 formed of a plate 4 moves up and down along the slide shaft 13. When the image display device 2 reaches a desired height position, the rotation operation of the operation handle 17 is stopped, and the image display device 2 is stopped at that position by a lock means (not shown).

  As described above, according to the lifting device 1 of the present embodiment, the image display device 2 can be easily installed on the existing installation stand 3, and the image display device 2 can be placed at an appropriate height position with a simple operation. Can be set to In addition, since the elevating mechanism 10 is provided symmetrically with the axis of the slide shaft 13 as a symmetrical axis, the axial rotational force of the horizontal drive shaft 15 is evenly transmitted to both ends of the second elevating plate 5, The lifting body 7 moves up and down while maintaining the balance between the left and right. Thus, even if the image display device 2 is heavy, it can be moved up and down smoothly.

  FIG. 7 is a front view showing an internal configuration of an upper half portion of a lifting and lowering apparatus 1A according to a second embodiment of the present invention. The configuration of the lower half is the same as that of the first embodiment, so the illustration thereof is omitted. Similarly to the first embodiment, the lifting body 7 of the lifting device 1A of the present embodiment also includes the first lifting plate 4 and the second lifting plate 5, and the first lifting plate 4 and the second lifting plate 5 are: In a state where they are integrated in parallel with each other, the flat box-shaped mounting base 6 is assembled so as to be capable of moving up and down via the elevating mechanism 10A.

  The elevating mechanism 10A of this embodiment is used to transmit the rotational drive unit 11A provided on the mounting base 6 and the rotational driving force of the rotational drive unit 11A so as to displace the elevating body 7 in the vertical direction. 12 A of drive transmission parts and the guide part 13 which guides the displacement to the said up-down direction of the said raising / lowering body 7 are included. The guide portion 13 of the present embodiment also includes a slide spline shaft (hereinafter referred to as “slide shaft 13”).

  The rotary drive unit 11A includes a horizontal drive shaft 37. The horizontal drive shaft 37 is connected with a handle shaft 38a supported rotatably on the mounting base 6 and a driving auxiliary plate (not shown) provided so as to protrude from the side of the mounting base 6. An operation handle 38 is attached to the other end of the handle shaft 38a.

The drive transmission unit 12A is interposed between the vertical drive shaft 39 orthogonal to the horizontal drive shaft 37 and the horizontal drive shaft 37 and the vertical drive shaft 39 to rotate the shaft of the horizontal drive shaft 37.
And an orthogonal gear pair 62 consisting of screw gears 60 and 61 for driving transmission to the shaft rotation of the motor.

  Further, the drive transmission portion 12A is attached to the worm gear 63 coaxially fixed to the vertical drive shaft 39 and to the mounting base 6 so as to be rotatable around a horizontal support shaft orthogonal to the horizontal drive shaft. A worm wheel 64 that meshes with the worm gear 63, a sprocket 65 that is coaxial with the worm wheel 64, and a plurality (only one is shown in FIG. 7) of idle sprockets 66 that are rotatably attached to the mounting base. And an end chain 67 which is wound around an idle sprocket 66 and is connected to the lifting body 7 at both ends. Each axis of each idle sprocket 66 is parallel to the axis of the worm wheel 64.

  Further, in this embodiment, the second worm wheel 68 meshing with the worm gear 63, the second sprocket 69 coaxially integrated with the second worm wheel 68, and the plurality of second idle sprockets 70 are symmetrical with respect to the axis of the slide shaft 13. As an axis, the mounting base 6 is provided symmetrically with the worm wheel 64, the sprocket 65, and the plurality of idle sprockets 66. A second end chain 71 having both ends coupled to the elevating body 7 is wound around the second sprocket 69 and a plurality (only one is shown in FIG. 7) of second idle sprockets 70.

  The first elevating plate 4 and the second elevating plate 5 of the present embodiment are also configured similarly to the first embodiment (see FIGS. 5 and 6), and both ends of the end chain 67, 71 are Are connected to the wedge-shaped piece 51 of the second lift plate 5 via the similar connectors 67a, 67b, 71a, 71b. The first elevating plate 4 is integrally provided with spline bearings 33 and 34 similar to those described above, and the slide shaft 13 is spline-fitted to the spline bearings 33 and 34 as described above. The mounting base 6 is fixed vertically to the upper and lower sides of the mounting base 6. As a result, the lifting / lowering body 7 including the first lifting / lowering plate 4 and the second lifting / lowering plate 5 is vertically displaced (elevating / lowering) in the vertical direction (vertical direction) along the longitudinal direction of the slide shaft 13 using the slide shaft 13 as a guide portion. ) It is possible.

  In the present embodiment, tension pulleys 72 and 73 are provided in the middle of the end chains 67 and 71. Further, the upper idle sprockets 66 and 70 are supported so as to be displaceable along the longitudinal direction of the laterally long slots 66a and 70a provided in the mounting base 6, and both of the slide shafts 13 are supported by a tension spring (not shown). The tension is applied in the direction away from the head. Further, a tension spring 74 (one of which is not shown) is stretched between the second elevating plate 5 and the end chains 67 and 71. In any of these, one that always applies a predetermined tension to the end chains 67 and 71 is desirably adopted, and can be applied to the first embodiment.

  Also in the lifting device 1A of the present embodiment, the image display device 2 is supported on the wing portion 41 of the first lifting plate 4 via the mounting plate 2a, and the connection fitting (not shown in the drawings) is omitted. 1A is installed on the installation stand 3 shown in FIG. 1 via the metal fittings 8 and 9). Thus, the image display device 2 is installed on the installation stand 3 while being supported by the lifting device 1A.

  In this way, when the operation handle 38 is rotated with the image display device 2 installed on the installation stand 3, the horizontal drive shaft 37 rotates through the handle shaft 38a, and this rotation of the shaft is caused by the screw gear 60, The driving force is transmitted to the rotation of the vertical drive shaft 39 via the orthogonal gear pair 62 consisting of 61. The shaft rotation of the vertical drive shaft 39 is transmitted via the worm gear 63 to the worm wheel 64 and the second worm wheel 68 meshing in a symmetrical relationship with the left and right of the worm gear 63.

  Therefore, the sprocket 65 and the second sprocket 69 that are coaxially integrated with the worm wheel 64 and the second worm wheel 68, and the end chain 67 and the second end chain 71 wound around the idle sprocket 66 and the second idle sprocket 70 are provided. Move up and down. As a result of the cooperative lifting and lowering displacement of the end chains 67 and 71, the lifting body 7 is lifted and lowered along the slide shaft 13 in the same manner as described above. The rotational force of the horizontal drive shaft 37 is uniformly transmitted to the left and right, and even if the image display device 2 attached to the elevating body 7 has a large weight, it can be moved up and down in a balanced manner.

  FIG. 8 is a front view showing an internal configuration of a lifting apparatus 1B according to a third embodiment of the present invention. In the lifting device 1B of this embodiment, the lifting body 7 includes a first lifting plate 4 having the same shape as the first lifting plate 4 shown in FIG. 2, and the first lifting plate 4 is a flat box-shaped mounting base 6. On the other hand, it is assembled so as to be movable up and down via a lifting mechanism 10B.

  8 is intended to be compatible with the lifting and lowering apparatus according to the other embodiments, the first lifting and lowering plate 4 and the second lifting and lowering plate 5 adopted in the other embodiments are for convenience. Shows an example where it is considered as one. The elevating mechanism 10B of the present embodiment is for transmitting the rotational drive unit 11B provided on the mounting base 6 and the rotational driving force of the rotational drive unit 11B so as to displace the elevating body 7 in the vertical direction. Drive transmission unit 12B.

  The rotary drive unit 11 B includes a horizontal drive shaft 75. The drive transmission portion 12B is provided integrally with the elevating plate 4 and a vertical screw shaft 76 that is orthogonal to the horizontal drive shaft 75 and is rotatably supported at the horizontal central portion of the mounting base 6. Screw nuts 77, 78 screwed to the shaft 76, and screw gears 100, 101 that are interposed between the horizontal drive shaft 75 and the screw shaft 76 to drive the shaft rotation of the horizontal drive shaft 75 to the shaft rotation of the screw shaft 76. And a pair of orthogonal gears 102.

  The screw shaft 76 is rotatably held by thrust bearings 76 a and 76 b at upper and lower end sides of the mounting base 6. The screw shaft 76 doubles as a guide portion 13 for guiding the elevation of the elevating body 7. On both sides of the back surface of the mounting base 6, connecting metal fittings 9 that are fixed to the horizontal bars 3c, 3d, 3e of the installation stand (see FIG. 1) are attached (in FIG. (The illustration is omitted). A handle shaft 79a is connected to the horizontal drive shaft 75, and an operation handle 79 similar to the above is attached to the other end of the handle shaft 79a.

  Also in the lifting device 1B of the present embodiment, the image display device 2 is supported on the wing portion 41 of the first lifting plate 4 via the mounting plate 2a (see FIG. 1), and the lifting and lowering device 1B is lifted and lowered via the connecting fitting 9. The apparatus 1B is installed on the installation stand 3 shown in FIG. As a result, the image display device 2 is installed on the installation stand 3 while being supported by the lifting device 1B.

  As described above, when the operation handle 79 is rotated while the image display device 2 is installed on the installation stand 3, the horizontal drive shaft 75 is rotated through the handle shaft 79a. The driving force is transmitted to the rotation of the screw shaft 76 via the orthogonal gear pair 102 consisting of 101.

Since the screw nuts 77 and 78 screwed to the screw shaft 76 are integrally provided on the elevating plate 4, the screw nuts 77 and 78 are fixed to the screw shaft 76 as the screw shaft 76 rotates. On the other hand, it is screwed and retreated. Due to the relative displacement caused by the screwing / retreating action, the elevating plate 4 (elevating body 7) moves up and down along the longitudinal direction of the screw shaft 76. By such a screwing relationship between the screw shaft 76 and the screw nuts 77, 78, even if the image display device 2 has a large weight, the raising and lowering is smoothly performed, and the screw shaft 76 is a part of the guide portion 13. Since it also serves as a part, the number of parts can be reduced.

  FIG. 9 is a front view showing an internal configuration of an upper half portion of a lifting and lowering apparatus 1C according to a fourth embodiment of the present invention. The lifting apparatus 1C of this embodiment differs from the lifting apparatus 1C of the embodiment (second embodiment) shown in FIG. 7 in that the rotation drive unit is a rotation drive unit 11C including the electric motor 103. The other configuration is the same as that of the example shown in FIG. 7, so the same reference numerals are given to the common parts, and the description thereof will be omitted below. That is, in the present embodiment, the rotation drive unit 11C includes the horizontal drive shaft 37 as described above, and the output shaft 103a of the electric motor 103 is connected to the horizontal drive shaft 37 via the connection shaft 37a. . Therefore, by the on / off operation of the electric motor 103, the elevating mechanism 10A operates in the same manner as described above, and the image display device 2 can be raised and lowered to be set at an appropriate height position.

  In this case, since the raising and lowering is performed by electric power, it is desirable to provide a limit switch on which the raising and lowering body 7 can act at an appropriate position of the mounting base 6 in order to prevent the raising and lowering of the raising and lowering body 7. Specifically, when the lift 7 acts on the limit switch, the limit switch generates a signal, whereby the electric motor 103 is automatically stopped. Although the limit switch 104 for preventing the excessive rise is illustrated in FIG. 9, the same limit switch is provided in the lower half, which is not illustrated, for the purpose of preventing the excessive fall. In the examples shown in FIGS. 2, 7 and 8 as well, it is naturally possible to adopt such an electric rotary drive unit 11C by the electric motor 103. In FIG. 2, FIG. 7 and FIG. 8, in consideration of the compatibility between the manual operation by the operation handle and the electric operation by the electric motor 103, the above limit switch (reference numeral omitted) is shown.

  In each of the above embodiments, the rotary drive unit includes the horizontal drive shaft. However, the present invention is not limited to this, and the vertical drive shaft is adopted, and the drive transmission unit is associated with it. You may make it move up and down. In the first, second and fourth embodiments, the end chain is coupled to the second elevating plate 5. However, the end chain may be coupled to the first elevating plate 4. .

  Furthermore, in the above embodiment, the slide shaft or the screw shaft constitutes a part of the guide portion, but further, a rail mechanism, a guide roller, etc., which are in sliding contact with each other between the mounting base 6 and the elevating body 7 It is also possible to provide it. In addition, although the installation stand as illustrated was illustrated as installation object, as long as an image display apparatus can be installed, it may be another thing, such as a rack apparatus, for example.

1, 1A, 1B, 1C Lifting device 2 Image display device 3 Installation stand 4 1st lifting plate 5 2nd lifting plate 6 Mounting base 7 Lifting body 10, 10A, 10B Lifting mechanism 11, 11A, 11B, 11C Rotational drive unit 12 , 12A, 12B Drive transmission part 13 Slide shaft 15, 37, 75 Horizontal drive shaft 18 Worm gear 19 Support shaft 20 Worm wheel 21 Sprocket 22, 23 Idle sprocket 24 Bound chain 25 Connected gear 26 Driven side connection gear 26a Support shaft 27 Side sprocket 28, 29 Drive side idle sprocket 30 Drive side endless chain 16, 38a, 79a Handle shaft 39 Vertical drive shaft 60, 61 Screw gear 62 Orthogonal gear pair 63 Worm gear 64 Worm wheel 65 Sprocket 66 Idle thruster Tsu DOO 67 end-defined chain 68 second worm wheel 69 second sprocket 70 second idle sprocket 71 second non-endless chain 76 screw shaft (guide portion)
77, 78 Screw nut 100, 101 Screw gear 102 Orthogonal gear pair 103 Electric motor 103a Output shaft

Claims (1)

A lifting device that supports the image display device to be lifted with respect to a setting target,
The adopted according to the installation target structures with movable legs, the mounting base comprising a connecting fitting for detachably engaging against the said installation target,
An elevating mechanism that is provided in the mounting base and the image display device and raises and lowers the image display device relative to the mounting base;
A rotation driving unit provided on the mounting base;
An ascending / descending body assembled to the attachment base so as to be movable up and down, and supporting the image display device;
A guide portion for vertically guiding the elevating body when the elevating body is moved up and down;
An elevating mechanism including a drive transmission unit that moves up and down while guiding the elevating body in the vertical direction by the guide unit by the rotational driving force of the rotational drive unit ,
The rotational drive unit includes a horizontal drive shaft,
The drive transmission unit is
A vertical drive axis orthogonal to the horizontal drive axis;
A pair of orthogonal gears provided between the horizontal drive shaft and the vertical drive shaft and transmitting axial rotation of the horizontal drive shaft to the vertical drive shaft;
A worm gear fixed coaxially with the vertical drive shaft;
A worm wheel that is rotatably attached to the mounting base body about an axis of a horizontal support shaft orthogonal to the horizontal drive shaft, and meshes with the worm gear;
A sprocket coaxial with the worm wheel;
An idle sprocket disposed below the sprocket on the mounting base and rotatably mounted about an axis parallel to the axis of the worm wheel;
A chain coupled to the elevator body and wound around the sprocket and the idle sprocket;
The guide portion includes a slide shaft mounted along a vertical direction perpendicular to the horizontal drive shaft at a horizontal center of the mounting base.
A lifting device of an image display apparatus, wherein the lifting body is slidably held on the slide shaft .

Images