JPH1033270A - Top plate elevating and lowering device for desk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly elevate and a top plate without generating the distortion of a guide part despite of a simple structure. SOLUTION: A supporting frame 7 suspended from the left and right end parts of the top plate is fitted inside a hollow leg body 4 and it is supported by a hydraulic cylinder 10. A guide shaft 16 and an extension spring 22 are separated to the front and back and arranged holding the hydraulic cylinder 10 therebetween and upper and lower bushes 18 fixed to the supporting frame 7 are fitted to the guide shaft 16. Since balance is attained by the spring 22 even though there is only one guide shaft 16, elevating and lowering are smoothly performed despite of the simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for elevating and lowering a top plate in a desk for office automation equipment.

[0002]

2. Description of the Related Art When a table top is raised and lowered dynamically, a screw shaft may be used as an elevating mechanism as disclosed in Japanese Utility Model Publication No. 2-39385 and Japanese Patent Publication No. 6-87813. For example, a gas spring is used as described in JP-A-50739 and Japanese Utility Model Publication No. 62-4219, or a lifting / lowering device that can expand and contract in the axial direction is used, such as using a hydraulic cylinder. doing.

[0003] Regardless of which of these lifting tools is used, it is necessary to guide the lifting so that the top plate does not swing. As this elevating guide means, for example, Japanese Utility Model Publication No. 55-50739 and Japanese Utility Model Publication No. 62-4219, a column-shaped side frame is provided so as to project downward from both left and right sides of a top plate, and is provided with a main body of a desk. Is slidably fitted into a fixed frame provided upright.

In Japanese Patent Publication No. 6-87813, a downward guide is protruded from a central portion of a top plate, and a guide shaft and a linear bearing (a bush) which is slidably fitted on the guide shaft. And an intermediate guide body is movably mounted vertically relative thereto, and an upward guide body extending along the intermediate guide body protrudes from the main body of the desk. The body is vertically movable via a guide shaft and a linear bearing, so that the top plate can be moved up and down.Furthermore, the screw shaft for raising and lowering is opposed to the upward guide body with the downward guide body interposed. It is described that a weight balance is achieved by arranging in a side part.

[0005]

SUMMARY OF THE INVENTION
As described in Japanese Patent Application Laid-Open No. 5-50739 and Japanese Utility Model Publication No. Sho 62-4219, means for directly fitting a support frame hanging from a top plate into a fixed frame erected on a base portion enables precise processing of members. Because of the difficulty, there is a problem that it is difficult to smoothly guide the vehicle due to a rubbing noise generated when the vehicle moves up and down.

On the other hand, when a guide shaft and a linear bearing are used as described in Japanese Patent Publication No. 6-87813, the vertical movement can be smoothly guided. Since a guide shaft and a linear bearing are required separately from the guide body, there is a problem that the number of parts is large and the cost is increased. In this regard, a pair of guide shafts are erected on both front and rear sides of an elevating device such as a hydraulic silling, and bushes (linear bearings) slidably fitted on the guide shafts are projected downward from the top plate. It is considered that it should be fixed to the support frame that has been set. However, in this configuration, in order to raise and lower the top plate smoothly, the front and rear guide shafts must be aligned with high precision so that the front and rear guide shafts are completely parallel so that no twisting occurs between the bush and the guide shaft. Therefore, there is a problem that assembling the desk takes time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lifting device capable of smoothly moving a top plate up and down with a simple structure.

[0008]

In order to achieve this object, the present invention provides a method in which the left and right sides of a top plate are supported by a vertically movable elevating tool such as a hydraulic cylinder so as to be adjustable in height. In the desk, "a support frame extending downward at least in the vicinity of the lifting / lowering device is provided on both left and right sides of the top plate, and the lifting / lowering portion is located on one of the front and rear sides of the desk body with the lifting / lowering device interposed therebetween. A guide shaft extending in parallel with the fixture is erected so as not to fall down, and a plurality of bushes slidably fitted to the guide shaft at appropriate intervals in the vertical direction are fixed to the support frame, and the lifting tool is sandwiched therebetween. A spring means for pulling the top plate downward is provided at a portion opposite to the guide shaft. "

Further, in the present invention, as described in claim 2, based on claim 1, the plurality of bushes may be integrally connected by a pipe.

[0010]

According to this structure, as the ascending and descending guide means for the top plate, only the guide shaft and the spring means are arranged separately on both front and rear sides of the elevating tool such as a hydraulic cylinder. Not only can the number of points be small, the structure can be simplified, but also the troublesome adjustment work, such as the case where guide shafts are arranged on both front and rear sides of the lifting / lowering device, can be improved without any troublesome assembly work. .

In addition, since the apparatus can be made compact by the simple structure, it is possible to easily incorporate the elevating device into the hollow leg of the desk, for example, and to improve the freedom of the design of the desk. . Further, when the top is lowered, the top is also pulled downward by the spring means, so that the top can be quickly lowered. In particular, when a one-port type hydraulic cylinder is used as a lifting / lowering device, the top plate is forcibly pulled down by the spring means, thereby escaping hydraulic oil in the hydraulic cylinder. It is particularly beneficial to be able to descend to

By the way, since the guide shaft is provided only on one of the front and rear sides with the lifting / lowering device interposed therebetween, the support frame falls down and is freely used. However, since the top plate is urged downward at a position opposite to the guide shaft with respect to the elevating device, the tendency of the support frame to fall down is corrected. There is no (or almost no) kinking in between. Therefore, the top plate can be moved up and down smoothly while the top plate can be moved down quickly with a simple configuration.

Further, when a plurality of bushes are integrally connected by a pipe as in claim 2, the posture is forcibly set so that each bush is concentric with the guide shaft. There is an advantage that it can be further improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is embodied in a desk for office automation equipment will be described with reference to the drawings. 1 to 6 show a first embodiment, of which FIG. 1 is a perspective view of a desk 1 for OA equipment. The OA equipment desk 1 includes a front top plate 2 for mounting a keyboard A, a rear top plate 3 for mounting a display B, and a pair of left and right hollow legs 4. Has a shelf 5 and a device storage 6
(See also FIG. 5). Left and right legs 5 and shelves 6
The desk body is constituted by the above.

From the left and right sides of the front and rear top plates 2 and 3, support frames 7 each having a rectangular cross section are projected downward, and these support frames 7 are fitted into the legs 4. The elevation mechanism is the same for the front and rear top plates 2 and 3, and FIGS.
The lifting mechanism of the front table 2 is shown as an example (FIG. 2).
3 is a cutaway perspective view, FIG. 3A is a sectional view taken along line III-III of FIG. 1, FIG. 3B is a sectional view taken along line BB of FIG.
(A) is a sectional view taken along line IV-IV in FIG. 1, and FIG. 4 (B) is a sectional view taken along line BB in FIG.

The support frames 7 of the top plates 2 and 3 are loosely fitted in square holes 8 formed in the upper surface of the leg 4.
Is supported by a hydraulic cylinder 10 fitted into the support frame 7 from below. The lower end of the hydraulic cylinder 10 is fixed to an L-shaped first bracket 11 fixed to the lower surface plate 4a of the leg 4 with a screw 12. The hydraulic cylinder 10 is a one-port type having one hose 13 connected to a lower end thereof. The hydraulic oil is supplied to and discharged from the hose 13 into and from the cylinder 10 to raise and lower the rod 10a.

As shown in FIG. 3, the upper end of the rod 10a of the hydraulic cylinder 10 is
It is fixed at. A window hole 15 for rotating the screw 14 is formed in the support frame 7. A guide shaft 16 having a circular cross section (other shapes may be used) is disposed behind the hydraulic cylinder 10. The upper end of the guide shaft 16 is fixed to the upper plate 4b of the leg 4 with a screw 17, while the lower end of the guide shaft 16 is fixed to the bottom plate 4c of the leg 4 with a screw 17, as shown in FIG. Have been. Therefore, the guide shaft 1
6 is held against the leg 4 so as not to fall down. Ona
The lower end of the guide shaft 16 may be fixed to the lower plate 4 b of the leg 4.

The guide shaft 16 has a pair of upper and lower bushes 1.
8 are slidably fitted.
Are fixed to the rear surface of the support frame 7 with screws via the second bracket 19. As shown in FIG. 4, on the inner surface of the bush 18, rows of a large number of balls 20 arranged in the axial direction are appropriately arranged at appropriate intervals along the circumferential direction by a retainer (not shown).

The lower bush 18 is fixed to the lower end of the support frame 7, and the upper bush 18 is supported so as to approach the upper plate of the leg 4 with the top plates 2, 4 raised to the upper limit. It is fixed to the frame 7. Support frame 7
A third bracket 21 extending toward the near side is fixed to the front surface of the third bracket at a position substantially at the same height as the mounting position of the rod 10a, and a spring means is provided between the third bracket 21 and the first bracket 11. Extension spring 2 as an example
2 is mounted.

As shown in FIG. 5, a hydraulic unit 23 composed of a motor and a hydraulic pump is disposed in the equipment housing 6, and the hydraulic unit 23 and the left and right hydraulic cylinders 10 are connected by the hose 13. . 2 in the equipment storage section 6
Hydraulic units 23 are arranged, and the front and rear top plates 2 and 3 are moved up and down by separate hydraulic units 23 (1).
The front and rear top plates 2 and 3 may be moved up and down by one hydraulic unit 23).

A rear plate 24 is fixed between the rear ends of the left and right legs 4, and a control box 25 for an electric system is provided as the rear plate 24. Also, as shown in FIG. 1, operation switches are provided at the left and right ends of the front top plate. These operation switches 2
6 is covered with a cover that can be freely opened and closed. In the above configuration, a valve is operated by the switches 26 to supply hydraulic oil from the hydraulic unit 23 to the hydraulic cylinder 10,
By sucking or naturally removing hydraulic oil from each hydraulic cylinder 10, the front and rear top plates 2 and 3 can be raised and lowered arbitrarily.

However, the simple structure in which the guide shaft 16 and the spring 22 are arranged on both front and rear sides of the hydraulic cylinder 10 can reduce the manufacturing cost and the labor for the accumulation operation. In addition, since the spring 22, the hydraulic cylinder 10, and the guide shaft 16 are arranged side by side in the front-rear direction, it is easy to store the elevating means in the hollow leg 4, and as a result, the aesthetic appearance is improved, and The freedom of design of the desk for OA equipment 1 can also be improved.

Also, as shown in FIG.
In the case where the guide shafts 16 are arranged on both front and rear sides with respect to 0, the parallelism of the front and rear guide shafts 16 must be set with high accuracy in order to smoothly raise and lower the support frame 7 without causing twisting. And the work is cumbersome,
According to the present invention, since the guide shaft 16 is merely disposed on one side of the support frame 7, the mounting of the guide shaft 16 is simple, and also in this respect, the labor of the assembling operation can be reduced.

The guide shaft 16 is connected to the hydraulic cylinder 1
0, the external force acts on the support frame 7 in such a manner as to tilt leftward in the state of FIG.
However, in the present invention, the disposition of the springs 22 with the hydraulic cylinder 10 interposed therebetween corrects the tendency of the support frame to fall down, and thus causes a twist. It can be raised and lowered smoothly without any trouble.

When the top plates 2 and 3 are lowered, the top plates 2 and 3 are pulled downward by the spring 22, so that the top plates 2 and 3 can be quickly lowered. In particular, even with the one-port type hydraulic cylinder 10 that supplies and discharges hydraulic oil with one hose 13 as in the embodiment, the top plates 2 and 3 can be quickly lowered (top plate 2). , 3 is more beneficial if the hydraulic oil is drained.

The use of the bush 18 containing the ball 20 as in the embodiment has an advantage that the lifting and lowering can be performed more smoothly. Further, when the guide shaft 16 is directly attached to the leg body 4 as in the embodiment, there is an advantage that the structure becomes simpler because a separate bracket is not required. FIG. 7 shows a second embodiment in which the upper and lower bushes 18 are integrally connected by a single pipe. In other words, this is an embodiment in which claim 2 is embodied. By doing so, the upper and lower bushes 18 are forcibly aligned with the posture concentric with the guide shaft 16, so that the labor of the assembling work can be further reduced. In this case, the pipe 27 may be fixed to the upper and lower bushes 18 by welding, screwing, or the like,
It may be in a state of being fitted to the bush 18 so as to be freely detachable.

The specific embodiments of the present invention have been described above.
It goes without saying that the present invention can be embodied in other forms. For example, instead of the hydraulic cylinder 10, a pneumatic cylinder (or gas spring) or a screw type lifting / lowering device may be used. Further, only one top plate may be used. Further, it goes without saying that the present invention can be applied to not only the desk for OA equipment but also other desks (tables). Further, the front and rear width of the support frame can be set arbitrarily. Further, the spring means is not limited to a coil spring as shown, but may be another downward biasing means such as a rubber string.

[Brief description of the drawings]

FIG. 1 is a perspective view of a desk for OA equipment according to a first embodiment.

FIG. 2 is a perspective view showing a lifting device.

3A is a sectional view taken along line III-III of FIG. 1, and FIG. 3B is a sectional view taken along line BB of FIG.

4A is a sectional view taken along line IV-IV of FIG. 1, and FIG. 4B is a sectional view taken along line BB of FIG.

FIG. 5 is a sectional view taken along line VV of FIG. 1;

6A is a schematic diagram for explaining the operation of the embodiment, and FIG. 6B is a schematic diagram for comparison.

FIG. 7 is a diagram showing a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 OA equipment desk 2, 3 Top plate 4 Leg 7 Support frame 10 Hydraulic cylinder 10a Rod 16 Guide shaft 18 Bush 22 Spring 27 Pipe

Claims (2)

[Claims] 1. A desk comprising left and right sides of a top plate which are supported in a height-adjustable manner by means of a vertically movable elevating tool such as a hydraulic cylinder. A supporting frame extending downward at least in the vicinity of the lifting / lowering tool is provided, and a guide shaft extending in parallel with the lifting / lowering tool is erected on one of the front and rear sides of the desk main body with the lifting / lowering tool therebetween. Then, a plurality of bushes slidably fitted to the guide shaft at appropriate intervals in the vertical direction are fixed to the support frame, and a top plate is provided at a portion opposite to the guide shaft with the lifting / lowering device interposed therebetween. Providing spring means for pulling downward;
A desk top lifting device. 2. A desk top lifting device according to claim 1, wherein said plurality of bushes are integrally connected by a pipe.