JPH0415066Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is applicable to desks and tables whose tops can be raised and lowered, such as office desks for office automation equipment and study desks. This invention relates to an improvement of a device for adjusting the height of a plate.

[Conventional technology]

The driving means for adjusting the height of the top of a desk generally uses a gear mechanism consisting of a rack and pinion gear, a worm gear mechanism, or a link mechanism, and these pinion gears or worm gears are connected to the handle. The top board is raised and lowered by rotating the top board, but when various devices are placed on the top board, there is a problem in that it takes a lot of effort to raise and lower the top board. It was hot.

Therefore, by constantly biasing the top plate in the upward direction using a spring, it is possible to raise and lower the top plate with a light force. Publication No. 32771 discloses that in a case where a pair of left and right lifting leg rods protruding downward from the bottom surface of a top plate are fitted to a pair of left and right legs that are erected at appropriate intervals, the legs can be moved vertically. A hollow case is fixed between the two, a drive shaft with both ends protruding from both sides of the case is rotatably provided inside the case, and a drive shaft is fixed to both ends of the drive shaft on both the left and right legs. By fixing a pinion gear that engages with the upper and lower longitudinal racks, and fixing a worm that engages with a worm wheel that rotates when the handle is rotated, in the middle of the drive shaft, It is disclosed that the top plate is configured to move up and down, and that a coil-shaped torsion spring is fitted to the drive shaft to urge the drive shaft to rotate in the direction in which the top plate rises. .

[The problem that the idea attempts to solve]

According to this prior art, the torsional elastic force of the torsion spring acts as a force to raise the top plate, so it has the advantage that the top plate can be raised and lowered with a light force, but on the other hand, this prior art In devices such as those that use a worm gear mechanism to raise and lower the top plate, the angle that the worm gear rotates per revolution of the worm wheel is small, so
There was a problem in that the handle had to be rotated many times to raise and lower the top plate, and it took time and effort to raise and lower the top plate.

To solve this problem, instead of providing a worm gear mechanism on the drive shaft, for example,
As described in Publication No. 37373, it may be possible to provide a locking means that allows the lifting legs on the top board to be switched between a state in which they can be moved up and down and a state in which they cannot be moved up and down by operating a lever. If the worm gear mechanism is removed from the drive shaft in the prior art, the drive shaft cannot be held in place and the torsion spring cannot be held in an elastically deformed state, making the work of assembling the desk extremely difficult. A problem arises.

In other words, when using a spring to bias the top plate in the upward direction, the elastic force of the spring must be applied when the desk is assembled, so the spring must be deformed against its elasticity. In that case, if the drive shaft is provided with a worm gear mechanism as in the prior art, the worm gear mechanism plays the role of preventing rotation of the drive shaft, so the torsion spring must be resisted in advance against its elasticity. However, if the worm gear mechanism is removed from the drive shaft in order to quickly raise and lower the table top, the worker will be able to hold the torsion spring in its deformed state and assemble the desk. Since the desk must be assembled while maintaining its elastically deformed state, the task of assembling the desk becomes extremely troublesome.

The present invention follows the prior art in that it uses torsion springs to allow the top to be raised and lowered with a light force, but it also solves the disadvantage of the prior art in that it takes time and effort to raise and lower the top. The purpose is to prevent this without impairing the ease of assembly work.

[Means to solve the problem]

In order to achieve this purpose, the present invention provides a pair of left and right lifting legs that are erected at appropriate intervals, and a pair of left and right lifting legs that protrude downward from the bottom surface of the top plate so that they can move up and down. In a device that adjusts the height of the top plate by rotating a pair of left and right pinion gears that mesh with vertically long racks provided on the legs, a hollow case is attached between the left and right legs, and the inside of the case is adjusted. A horizontally elongated drive shaft with both left and right ends protruding from both left and right side surfaces of the case is rotatably provided via bearings fixed to both left and right ends of the case, and the left and right pinion gears are attached to both left and right ends of the drive shaft. A coil-shaped torsion spring for biasing the drive shaft to rotate in the direction in which the top plate rises is fitted into a portion of the drive shaft located inside the case, while the case Alternatively, the bearing is provided with a stopper means that engages and disengages from the drive shaft to switch the drive shaft between a non-rotatable state and a rotatable state, and further, a stopper means is provided on the side surface of both the left and right pinion gears in the circumferential direction. Engagement holes are bored at appropriate intervals along the pinion gear, and the case is provided with a locking pin that engages and disengages from the engagement hole of the pinion gear by operating a lever.

[Functions and effects of the idea]

With this configuration, the case, the drive shaft, and the torsion spring are integrated into a unit, and the torsion spring is elastically deformed by rotating the drive shaft in advance.
Next, by holding the drive shaft in a non-rotatable state using the stopper means, the torsion spring can be held in a state in which it is deformed against elasticity. It is not necessary to hold the torsion spring in an elastically deformed state.

After assembling the desk, etc., the stopper means is operated to disengage from the drive shaft,
Make the drive shaft rotatable, and under that condition,
When the lever is operated to remove the locking pin from the engagement hole of both the left and right pinion gears, and the lifting leg can move up and down, the torsional elastic force of the torsion spring will cause the top plate to move against the drive shaft. Since the top plate is rotated in the direction of raising the top plate, the top plate is raised only by the torsional elastic force of the torsion spring, or it can be raised by just lifting it lightly. It can be raised to a predetermined height with a single touch, and can be lowered by pressing it with your hand.

Then, with the top plate positioned at a predetermined height, if you operate the lever and engage the locking pin with the engagement hole of both the left and right pinion gears, both the left and right pinion gears will be unable to move up and down. This keeps the top plate at that height.

In other words, the height of the top plate can be adjusted with a single touch.

Therefore, according to the present invention, in the device in which the height position of the top plate can be adjusted with one touch,
By integrating the case, drive shaft, and torsion spring into a unit, and by being able to hold the torsion spring in a state in which it is deformed against elasticity without requiring the operator's intervention, the case, drive shaft, and drive Since the shaft can be attached quickly, the height of the top plate can be adjusted quickly without compromising the ease of assembling the desk or the like.

〔Example〕

Next, an embodiment in which the present invention is applied to a desk will be described based on the drawings. In the drawing, reference numeral 1 indicates a pair of left and right legs of the desk,
has a box-shaped frame 2 with an open top, and into the left and right legs 1 are inserted lifting legs 4 having a rectangular cross section and projecting downward from the bottom surface of the top plate 3 so as to be movable up and down.

Reference numeral 5 indicates a vertical longitudinal rack fixed to the inner surface of both the left and right lifting legs 4, and reference numeral 6 indicates the rack 5.
The main parts of the height adjustment mechanism that drives both pinion gears 6 are shown as follows.
It is housed in a hollow case 7 with a rectangular cross section attached between the left and right legs 1.

Inside the case 7 is a drive shaft 9 having spline teeth 8 formed on its outer periphery over its entire length, and both ends of the drive shaft 9 protrude from both left and right side surfaces of the case 7 to connect the left and right legs 1.
The drive shaft 9 is arranged so as to fit into the hollow part of the drive shaft 9.
is supported by bearings 10 and 11 that are non-rotatably fixed to both left and right ends of the case 7, and both pinion gears 6 are non-rotatably attached to both left and right ends of the drive shaft 9 by spline fitting. The top plate 3 is configured to move up and down as the drive shaft 9 rotates.

A coil-shaped torsion spring 14 for urging the drive shaft 9 to rotate in the direction of raising the top plate 3 is fitted onto a portion of the drive shaft 9 located inside the case 7, and the torsion One end of the spring 14 is locked in the locking hole 16 of one of the two bearings 10, 11, while the other end of the torsion spring 14 is slidably fitted to the drive shaft 9 by spline fitting. In addition, it is locked to the cylindrical body 12 fitted in a non-rotatable manner. Reference numeral 13 indicates an engagement groove that engages with the spline teeth 8 of the drive shaft 9.

The torsion spring 14 is a spring wire rod 14 having a diameter d.
A is wound into a coil shape with an inner diameter D1, and the other end of the torsion spring 14 is screwed into a spiral groove 15 carved on the outer peripheral surface of the cylinder 12. 12.

A bolt 18, which is an example of a stopper means for switching the drive shaft 9 between a non-rotatable state and a non-rotatable state, is screwed into both the left and right bearings 10, 11, and the bolt 18 is inserted into a wrench from the outside of the case 7. The drive shaft 9 can be switched between a rotatable state and a non-rotatable state by rotating the drive shaft 9 and engaging and disengaging its tip from the spline teeth 8 of the drive shaft 9.

Note that the bolts designated by numeral 19 are for both left and right bearings 1.
0 and 11 to the case 7.

Reference numeral 20 denotes a locking means for holding the height of the top plate 3 at an arbitrary height position, and the locking means 20
A locking pin 22 is provided on the outer surface of the case 7 so as to be slidable left and right so as to be engaged with and disengaged from the engagement holes 21 formed at appropriate pitches along the circumferential direction on the inner surface of the left and right pinion gears 6. , the tips of the left and right locking pins 2
It consists of a pair of left and right interlocking rods 23 screwed onto the base of the case 2, and a lever 24 pivotally connected to the case 7 by a pin 25 so as to be horizontally rotatable. However, by locking the left and right interlocking rods 23 on both sides, the left and right locking pins 22 are simultaneously inserted and removed toward the engagement holes 21 of the left and right pinion gears 6 by rotating the lever 24. A tension spring 26 is provided between the lever 24 and the case 5 for biasing the left and right locking pins 22 in the direction of engaging the engagement hole 21 of the pinion gear 6. Mount it.

As shown in FIGS. 4 and 5, an arm 28 protruding forward from the front side of the case 7 is bolted to the lower surface of the horizontal frame 27 that connects the side surfaces of the box-shaped frame 2 in the left and right legs 1. 29, and the tip of the lever 24 protrudes toward the front of the desk from a horizontally long hole bored in the front plate of the horizontal frame 27.

Reference numeral 30 shown in FIGS. 3 and 4 is a rotating roller attached to the elevating leg 4 so as to roll against the inner surface of the box-shaped frame 2 of the left and right leg bodies 1, and smooth the vertical movement of the elevating leg 4. It is for.

Note that a vertical guide groove 3 is formed on the inner surface of the elevating leg 4 so as not to interfere with the drive shaft 9 when the elevating leg 4 is raised and lowered.
2 is formed.

The desk with the above configuration is assembled through the following steps.

That is, first, the other end of the torsion spring 14 is screwed into the helical groove 15 of the cylindrical body 12 and locked therein, while the other end of the torsion spring 14 is held in a free state (a state in which no torsional deformation is applied) to one of the bearings 10. locking hole 16
After inserting these three parts into the case 7, both the left and right bearings 10, 11 are fixed to the ends of the case 7 with bolts 19, and then the case 7 is held non-rotatably. By rotating the torsion spring 14 around the axis of the coil, a predetermined torsional elastic force is applied to the torsion spring 14, and in the state in which the torsional elastic force is applied, the drive shaft 9 is actuated as a stopper means 17. Screw in the bolt 18 of
The drive shaft 9 is held in a non-rotatable state.

Then, while the case 7 is connected to the horizontal frame 27, pinion gears 6 are fitted to both left and right ends of the drive shaft 9 protruding from both left and right ends of the case 7, respectively.
Each pinion gear 6 is inserted into the hollow part of the lifting leg 4 through the insertion hole 31 bored in the inner surface of both the left and right box-shaped frame 2 and the lifting leg 4, and the left and right pinion gears 6 are inserted into the lifting leg 4. It engages with the rack 5 at a predetermined height position (the lowest position of the elevating legs 4), and then the left and right ends of the horizontal frame 27 are fixed to both box-shaped frames 2.

In this way, the drive shaft 9 and the torsion spring 14 as a drive mechanism for adjusting the height of the top plate 3 are incorporated into the case 7 to form a unit, and the torsion spring 14 is screwed in with the bolt 18. By being able to maintain the state in which torsional elasticity is applied, the desk can be assembled extremely easily.

In this case, if the bolt 18 is used as the stopper means as in the embodiment, the structure can be simplified and the drive shaft 9 can be fixed at any rotational position, so the torsional elastic force of the torsion spring 14 can be slightly reduced. It has the advantage of being adjustable.

After assembly, loosen the bolt 18 to allow the drive shaft 9 to rotate, and then remove the lever 24.
When the locking pin 22 is removed from the engagement hole 21 of the pinion gear 6 by rotating as shown by the dashed line in FIG. Since it acts to raise the top plate 3 via the pinion gear 6 and the rack 5, the top plate 3 can be raised directly by only the torsional elastic force of the torsion spring 14, or simply lifted by hand. Once the top plate 3 is in the rising position, the top plate 3 can be raised and lowered with light force.When the top plate 3 is at a predetermined height position, the lever 24 is returned and rotated to release both the left and right locking pins 22. Both left and right pinion gears 6
By inserting the pinion gear 6 into the engagement hole 21 and making the pinion gear 6 non-rotatable, the top plate 3 can be held at a predetermined height position.

Cylindrical body 1 to which the other end of the torsion spring 14 is locked
2 is fitted on the drive shaft 9 so as to be non-rotatable and slidable in the axial direction, so that the torsion spring 14
When applying torsional elastic force to the top plate 3 or releasing the torsional elastic force as the top plate 3 rises,
Even if the torsion spring 14 is deformed in its length direction, the change in length is absorbed by the movement of the cylindrical body 12 along its axial direction.

Note that the case 7 is not limited to a rectangular cross section, and can be arbitrarily set to have a U-shaped cross section. In addition, the means for fitting the cylinder 12 onto the drive shaft 9 in a non-rotatable but slidable manner in the axial direction is not limited to spline fitting as in the embodiment, but also a means for fitting the cylinder 12 to the drive shaft 9 in a manner such that it is not rotatable but slidable in the axial direction. A key engagement consisting of a key may also be used.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional front view showing the main parts, FIG.
The figure is a plan sectional view showing the main parts, and is a cross-sectional view from the - side in Fig. 3, Fig. 3 is a - sectional view from the - side in Fig. 2, and Fig. 4 is an enlarged partially cutaway sectional view of the main part in Fig. 3. Figure 5 is a cross-sectional view of Figure 1, and Figure 6 is a - view of Figure 1.
7 is a partially cutaway side view of the cylindrical body, and FIG. 8 is a side view taken from - in FIG. 7. 1... Legs, 2... Box-shaped frame, 3... Top plate, 4... Lifting legs, 5... Rack, 6... Pinion, 7... Case, 8... Spline, 9... Drive shaft , 10, 11... Bearing, 12... Cylindrical body, 14
... Coil spring, 15 ... Spiral groove, 16 ... Locking hole, 17 ... Stopper means, 18 ... Bolt, 2
1... Engagement hole, 22... Locking pin, 23... Interlocking rod, 24... Lever.

Claims (1)

[Scope of utility model registration request] On a pair of left and right legs erected at appropriate intervals,
A pair of left and right lifting legs projecting downward from the bottom surface of the top plate are provided so as to be movable up and down, and the height of the top plate is adjusted by rotation of a pair of left and right pinion gears that mesh with vertically long racks provided on both the left and right lifting legs. In the adjusting device,
A hollow case is attached between the left and right legs, and a horizontally long drive shaft with both left and right ends protruding from both left and right side surfaces of the case is provided inside the case.
The case is rotatably provided via bearings fixed to both left and right ends of the case, the left and right pinion gears are respectively attached to both left and right ends of the drive shaft, and the drive shaft is attached to a portion of the drive shaft located inside the case. A coil-shaped torsion spring is fitted in the case or bearing to urge the top plate to rotate in the upward direction, and the drive shaft is connected to and disengaged from the case or bearing, so that the drive shaft is in a non-rotatable state and rotates. A stopper means is provided for switching the pinion gear to the available state, and engagement holes are bored at appropriate intervals along the circumferential direction on the side surfaces of both the left and right pinion gears, and the stopper means is provided in the case so that the pinion gear can be moved to the left and right pinion gears at suitable intervals along the circumferential direction. A height adjusting device for a top plate of a desk or the like, characterized in that a locking pin that engages and disengages from the engagement hole of the pinion gear is provided.