JPH0425003Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention mainly relates to legs of desks, chairs, tables, beds, etc.

(Prior art) Generally, this type of leg body is
As shown in Publication No. 34409, an inner cylinder is slidably inserted into an outer cylinder, and a lock plate having a plurality of engagement holes is fixed to the outer cylinder. By providing a lock device including a lock body that fits into a groove and an operating lever that controls engagement of the lock body with the engagement groove, and engaging the lock body with an arbitrary engagement hole, The inner cylinder is fixed to the outer cylinder, and the lock body is disengaged from the engagement hole by operating the operating lever, so that the inner cylinder can freely slide with respect to the outer cylinder, A device that allows the total length of the legs to be adjusted has been developed.

(Problems to be Solved by the Invention) By the way, in the leg body having the above structure, when the engagement between the lock body and the engagement hole is released by operating the operation lever as described above, the inner cylinder is opened. Since it can slide freely relative to the front outer cylinder, when used as a leg of the chair, for example, when the lock body and the engagement hole are disengaged while sitting on the seat of the chair, the The inner cylinder instantly retracts into the outer cylinder due to a large load acting on the leg body, and the inner cylinder violently collides with the outer cylinder,
There are problems such as causing discomfort to the person sitting on the seat.

This invention was developed in view of the above circumstances.
The objective is to have an extremely simple configuration that allows the length adjustment by sliding the inner cylinder to be performed smoothly without much resistance, while also ensuring rapid sliding of the inner cylinder in the direction of retraction into the outer cylinder. The aim is to provide legs that can be heated quickly.

(Means for Solving the Problems) Accordingly, the present invention has an arrangement in which the inner cylinder 2 is inserted into the outer cylinder 1 so as to be freely retractable, and the inner cylinder 2 is inserted between the outer cylinder 1 and the inner cylinder 2. The leg body is equipped with a locking device L for locking the sliding of the outer cylinder 1 with respect to the outer cylinder 1, and the outer cylinder 1 and the inner cylinder 2 are provided with a locking device L for locking the slide with respect to the outer cylinder 1. A brake chamber 80 is formed with a tapered surface 81 that slopes inward in the radial direction and faces the other cylinder, and the brake chamber 80 includes:
A friction body 9 that fits between the tapered surface 81 and the other cylinder when the inner cylinder 2 slides in the storage direction with respect to the outer cylinder 1 is installed inside, and the inner cylinder 2 is retracted into the outer cylinder 1. A spring 24 is interposed between the outer cylinder 1 and the inner cylinder 2 to bias the inner cylinder 2 in the direction of pulling out the outer cylinder 1. It is characterized by the fact that it is equipped with

(Function) According to the present invention, when the inner cylinder 2 rapidly slides in the direction of retraction with respect to the outer cylinder 1, the friction body 9 in the brake chamber 80 moves between the tapered surface 81 and the other cylinder. The spring 24 is also compressed, and the spring reaction force generated in the spring 24 causes the inner cylinder 2 to slide. A brake is applied to the sliding of the outer cylinder 1 in the direction of retraction, and thus the sliding of the inner cylinder 2 is reliably slowed down.

Moreover, as described above, since both the friction body 9 and the spring 24 can slow down the slide of the inner cylinder 2, the friction body 9
Even if the sliding resistance force applied to the inner cylinder 2 is set to be small, rapid sliding of the inner cylinder 2 can be reliably prevented, and at the same time, the normal resistance of the inner cylinder 2 to the outer cylinder 1 When adjusting the length, the friction body 2 does not obstruct the sliding operation of the inner cylinder 2 in the direction of retraction with respect to the outer cylinder 1, and the inner cylinder 2 can be slid smoothly. I can do it.

(Embodiment) An embodiment of the leg body according to the present invention will be described below with reference to the drawings.

The drawing shows the legs of a chair, including a cylindrical outer cylinder 1, a cylindrical inner cylinder 2 that is removably inserted into the outer cylinder 1, and the inner cylinder 2 connected to the outer cylinder 1. The locking device L locks at a plurality of positions on the outer cylinder 1, and the chair leg A is fixed to the lower end of the outer cylinder 1, and the housing 20 is fixed to the upper end of the inner cylinder 2.
and place the seat body B of the chair on the housing 20.
is fixed, and by the operation of the locking device L, the inner cylinder 2 is slid in the direction of expansion and contraction with respect to the outer cylinder 1, so that the overall length thereof can be changed arbitrarily,
The height of the seat B can be adjusted.

The locking device L shown in the figure basically includes a base plate 4 having a plurality of engaging parts 3, a locking body 5 that engages with the engaging parts 3, and a locking body 5 that engages with the engaging parts 3.
a support body 6 that reciprocably supports the lock body 5;
The structure of each of these components will be explained in detail below.

First, the base plate 4 is made of an elongated plate material, and a plurality of the engaging parts 3 made of square holes are formed along the length direction at predetermined intervals. A receiving piece 42 is integrally formed on each of the fixing pieces 41 .
is bolted to the outer cylinder 1 via a fixing plate 11 that is fitted and fixed to the lower end opening of the outer cylinder 1.

Further, the support body 6 includes a fixing piece 61 to the inner cylinder 2.
and a pair of supporting pieces 62 that are bent from both ends in the width direction of the fixing piece 61 and extending in parallel toward the base plate 4. In addition to being fixed, guide holes 64 extending in the width direction are bored in both support pieces 62.

On the other hand, the lock body 5 is connected to the base plate 4.
a fitting protrusion 51 that fits into the engaging portion 3; and a cylindrical first guide protrusion 5 that is inserted into the guide hole 64.
2, the fixing piece 62 of the support body 6 and the inner cylinder 2
The second guide protrusion 5 enters the through hole 60 bored in the second guide protrusion 5.
3, the lock body 5 is interposed between both support pieces 62 of the support body 6, the first guide protrusion 52 is inserted into the guide hole 64 of the support piece 62, and the second guide protrusion is inserted into the guide hole 64 of the support piece 62. 53 into the through holes 60, so that the lock body 5 can move freely only in the direction of approaching and away from the base plate 4 (left and right direction in FIG. By moving in the direction, the fitting protrusion 51 is configured to fit into the engaging portion 3.

Further, a coil spring 66 is interposed on the shaft 65 which is mounted between the supporting pieces 62, 62 of the support body 6, and one end of the spring 66 is connected to the fixed piece 41.
In addition, the other end is brought into contact with the lock body 5, and the spring force of the spring 66 urges the lock body 5 toward the base plate 4 side.

On the other hand, the operating lever mechanism 7
1, a cam body 72 for forcibly moving the lock body 5 in a direction away from the base plate 4, and a connecting rod 73 that connects the cam body 72 to the operating lever 71, One end of 71 is pivotally mounted in the housing 20, and its free end is passed through the through hole 21 formed in the upper end of the inner cylinder 2 to the through hole 22 formed in the housing 20, and is inserted into the outside of the housing 20. It sticks out to the side.

Further, the cam body 72 includes opposing integral opposing walls 74, 74, and a connecting wall 75 connecting these opposing walls 74, 74, and the opposing walls 74, 74.
has a cam groove 76 into which the first guide protrusion 52 of the lock body 5 enters, and the connecting wall 75 has a cam groove 76 into which the first guide projection 52 of the lock body 5 enters;
A long hole 77 through which the fitting protrusion 52 of the cam body 5 is inserted.
are formed respectively.

Then, the opposing walls 74, 74 are interposed between the lock body 5 and each support piece 62, and
The connecting wall 75 is interposed between the lock body 5 and the base plate 4 to allow the cam body 72 to move freely along the length direction of the base plate 4, while also allowing the cam body 72 to move freely along the length of the base plate 4. A return spring 78 is interposed between the plate 23 inserted and fixed into the upper end opening and the connecting rod 73, and the spring force of the return spring 78 urges the lock body 5 downward.

The connecting rod 73 is disposed inside the inner cylinder 2, and the cam body 72 is connected to the connecting pin 72 at the lower end thereof.
a, and a hook 79 is integrally formed on the upper end, and the operating lever 7 is attached to the hook 79.
1 is hooked.

A coil-shaped spring 24 is also interposed between the plate 23 fitted and fixed to the upper end opening of the inner cylinder 2 and the receiving piece 42 of the base plate 4, and the spring force of the spring 24 causes the inner cylinder to open. The tube 2 is biased in the drawing direction with respect to the outer tube 1.

On the other hand, a cylindrical holder 8 made of synthetic resin is fixed to the upper end opening of the outer cylinder 1, and a cylindrical holder 8 made of synthetic resin is fixed to the inner periphery of the holder 8 in the direction in which the inner cylinder 2 moves into and out of the outer cylinder 1. A braking chamber 80 having a right triangular longitudinal section and having a tapered surface 81 that slopes radially inward toward the inner cylinder 2 and an upper surface 82 that extends radially inward from the upper end of the taper 81 is provided around the inner cylinder 2. , a ring-shaped friction body 9 whose inner diameter is slightly smaller than the outer diameter of the inner cylinder 2 is formed from soft synthetic rubber, and with this friction body 9 fitted to the outer periphery of the inner cylinder 2, the brake The friction body 9 is inserted in the chamber 80 and is fitted in a wedge shape between the tapered surface 81 and the outer peripheral surface of the inner cylinder 2 when the inner cylinder 2 slides in the storage direction with respect to the outer cylinder 1. Then, the inner circumference 2
It is configured to provide resistance to sliding in the direction of retraction into the outer cylinder 1.

Next, the operation of the leg body constructed as described above will be explained.

FIG. 1 shows a state in which the operating lever device 7 is not operated, and at this time, the cam body 72
is moving downward due to the spring reaction force of the return spring 78, so the lock body 5
is due to the spring force of the coil spring 66,
Moving toward the base plate 4 side, the first guide protrusion 52 of the lock body 5 enters into the cam groove 76 of the cam body 72, and the fitting protrusion 58
is fitted into one of the engaging portions 3 of the base plate 4.

Therefore, the inner tube 2 does not slide relative to the outer tube 1 either in the direction of being pulled out or in the direction of being stored, so the seat body B is reliably maintained at a predetermined height. .

If you want to change the height of the seat B, all you have to do is push up the free end of the operating lever 71, and by pushing up the operating lever 71,
The cam body 72 moves upward against the return spring 78, and as a result, the first guide protrusion 52 of the lock body 5 is guided by the slope of the cam groove 76 in the cam body 72 and moves upward. Cam groove 7
6, the lock body 5 moves away from the base plate 4 against the coil spring 66 (to the right in FIG. The inner cylinder 2 is disengaged from the engaging portion 3, and thereby the inner cylinder 2 can freely slide in either the pull-out direction or the storage direction with respect to the outer cylinder 1.

Then, when the inner cylinder 2 is slid in a desired direction relative to the outer cylinder 1 and the height of the seat body B is adjusted, the push operation of the operating lever 71 is released. The cam body 72 moves downward due to the spring reaction force of the return spring 78, and when the opening of the cam groove 76 corresponds to the first guide projection 52 due to the downward movement of the cam body 72, the opening of the cam groove 76 corresponds to the first guide protrusion 52. , the coil spring 6
The lock body 5 moves in the direction of the base plate 4 due to the spring reaction force 6. and,
When the fitting protrusion 51 of the lock body 5 is in a position facing the engaging part 3, the fitting protrusion 51 immediately fits into the engaging part 3, and the position of the fitting protrusion 51 is If it is misaligned with respect to the engaging portion 3, by slightly sliding the inner cylinder 2 with respect to the outer cylinder 1 in the pull-out direction or storage direction, the fitting protrusion 51 It comes to a position facing the portion 3 and is fitted into the engaging portion 3, thereby completing the height adjustment of the seat B.

However, when changing the height of the seat B by operating the operating lever 71 as described above, when changing the height of the seat B while sitting on the seat B,
Alternatively, if the operating lever 71 is erroneously operated while sitting on the seat B, the fitting protrusion 51 is disengaged from the engaging portion 3 due to the load acting on the inner cylinder 2, and the inner cylinder 2 is Although the inner cylinder 2 tries to slide rapidly in the direction in which it is stored with respect to the outer cylinder 1, as shown in FIG. The tapered surface 81 and the outer peripheral surface of the inner cylinder 2 are fitted in a wedge shape, and the friction body 9 applies a brake to the movement of the inner cylinder 2 into and out of the outer cylinder 1, while the spring 24 is compressed,
A spring reaction force is generated in the spring 24 in the direction of pulling out the inner cylinder 2 with respect to the outer cylinder 1, and thus, due to the braking action by the friction body 9 and the spring reaction force of the spring 24. , the inner cylinder 2 slowly descends without rapidly sliding relative to the outer cylinder 1, and collision of the inner cylinder 2 with the outer cylinder 1 can be avoided.

In addition, when the inner cylinder 2 is pulled out from the outer cylinder 1, the friction body 9 hits the upper surface 82 of the brake chamber 80 and the tapered surface 81 and the inner Since there is no wedge-shaped fit between the outer circumferential surface of the cylinder 2 and the outer peripheral surface of the cylinder 2, the sliding of the inner cylinder 2 in the pulling direction with respect to the outer cylinder 1 is limited to the storage of the inner cylinder 2 with respect to the outer cylinder 1. It can be done very lightly compared to sliding in the direction.

In the above embodiment, the braking chamber 80 with the tapered surface 81 was provided on the outer cylinder 1 side, but as shown in FIG. It may be made to face the inner circumferential surface.

Furthermore, in the above embodiments, the friction body 9 is formed into a ring shape, but it is not limited to this.
It may also be formed into a plurality of block pieces.

Further, in the above embodiments, the legs of a chair are used as an example, but the present invention is not limited to this, and can be applied to legs of desks, tables, beds, etc.

(Effect of the invention) As described above, according to the invention, when the inner cylinder 2 rapidly slides in the direction of retraction with respect to the outer cylinder 1, the friction body 9 in the braking chamber 80 moves toward the tapered surface 81. and the circumferential surface of the other cylinder, and serve as a resistance to the sliding of the inner cylinder 2, and the spring 24 is also compressed, and the spring reaction force generated in the spring 24 A brake is applied to the sliding of the inner cylinder 2 in the retracting direction with respect to the outer cylinder 1, and the sliding of the inner cylinder 2 is thus caused by the frictional resistance of the friction body 9 and the spring reaction force of the spring 24. will definitely warm up the temperature.

Moreover, as described above, since the sliding of the inner cylinder 2 can be slowed down by the friction body 9 and the spring 24, the sliding resistance force applied to the inner cylinder 2 by the friction body 9 can be set small. Even if the inner cylinder 2 is adjusted to a normal length with respect to the outer cylinder 1, the friction body 2 can surely prevent the inner cylinder 2 from sliding rapidly. There is no obstacle to the sliding operation in the direction of retraction with respect to the outer cylinder 1, and the inner cylinder 2 can be slid smoothly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the leg body according to the present invention, Figs. 2 and 3 are partially cutaway side views of the main parts, Fig. 4 is a front view of the locking device, and Fig. 5 is 6 is an exploded perspective view of the locking device, FIG. 7 is a schematic perspective view of the leg according to the present invention used as the leg of a chair, and FIG. 8 is a schematic diagram showing another embodiment. FIG. 1... Outer cylinder, 2... Inner cylinder, 24... Spring, 80... Braking chamber, 81... Tapered surface, 9...
Friction body, L...Lock device.

Claims (1)

[Scope of utility model registration request] Inserting and retracting the inner cylinder 2 into the outer cylinder 1, and
The leg body is provided with a locking device L between the outer cylinder 1 and the inner cylinder 2 that locks the sliding of the inner cylinder 2 with respect to the outer cylinder 1, and the A braking chamber 80 is formed with a tapered surface 81 that is inclined radially inward in the direction in which the inner cylinder 2 moves into and out of the outer cylinder 1 and faces the other cylinder. , when the inner cylinder 2 slides in the storage direction with respect to the outer cylinder 1, the tapered surface 8
A friction body 9 that fits between the inner cylinder 1 and the other cylinder is installed to provide resistance to the sliding of the inner cylinder 2 into and out of the outer cylinder 1. 1 and the inner cylinder 2, a spring 24 biases the inner cylinder 2 in a direction to pull out the inner cylinder 2 with respect to the outer cylinder 1.
A leg body characterized by being interposed with.