JPS643486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation lever mounting structure for a length-adjustable telescoping device, and more specifically, the present invention relates to an operating lever mounting structure for a length-adjustable telescoping device, and more specifically, the present invention relates to an operating lever mounting structure for a length-adjustable telescoping device. A cylinder that slidably accommodates an operating piston, and a piston rod that has one end connected to the piston and the other end that telescopically protrudes from the end of the cylinder, for example, for adjusting the height and angle of a chair, table, etc. This invention relates to an improvement in the operation lever mounting structure of a length-adjustable telescoping device that constitutes a part of a support column, etc.

In chairs and tables that are equipped with conventional length-adjustable length-adjustable telescoping devices of this type as vertical supports or tilting supports, the operating lever for adjusting the length of the telescoping device has shaft holes drilled at key points of the lever. At the same time, it was pivotally attached to a bracket protruding from the support column or the bottom surface of the seat using a horizontal axis pin.

For this reason, there are restrictions on the mounting direction of the operating lever, the need to insert a small shaft pin and a means to prevent it from falling off, making it troublesome to install and remove the lever. Stress was concentrated in the thin walled portion around the shaft hole, making it easy to break.

In addition, as an installation method for this type of operating lever that does not use the above-mentioned pivoting method using a shaft hole and a shaft pin, there is a method for installing a snap on the upper and lower supports for a chair, as shown in FIG. 1, for example. A piston 2 is slidably provided in a piston 1, and an on-off valve 4 is inserted into a piston rod 3 connected to the piston 2, and a valve 4 is inserted into the piston rod 3 to accurately engage with the tip of a push rod 5 for operating the on-off valve 4. A snap spherical surface or a snap ring groove 7 is formed at the tip of the operating lever 6, and this lever 6 is inserted through a single opening 8 drilled in the piston rod 3 and connected so that it can be tilted upward. Not only is difficult machining required for the joint structure, but the operating direction of the operating lever is limited to one direction, similar to the above-mentioned shaft pin pivoting method, which causes inconvenience when assembling it to a chair, etc. It is inconvenient for the operator to grasp the operating direction, and there is a risk that the lever may bend or break if the lever is forcibly operated in the opposite direction.

The present invention can solve the above-mentioned drawbacks, and can easily attach and detach the operating lever with a single touch, and the lever can be operated in both directions, that is, depending on the installation state of the telescoping device, for example, To provide an operating lever mounting structure for a length-adjustable telescoping device that can reliably push a push rod in any direction, such as up and down, front and back, or left and right.

One embodiment of the present invention will be described below based on the accompanying drawings.

The internal structure and operating procedure of the length-adjustable telescoping device itself, which adjusts the height and angle of chairs, tables, etc., are the same as the conventional one shown in FIG. As shown in FIG. 2, one end is attached to a piston (not shown) that is slidably provided to define two chambers inside a cylinder 9 that is filled with a working fluid that is affected by the pressure of a sealed gas. A threaded portion 11 is formed at the tip of a piston rod 10 whose other end protrudes telescopically from the end of the cylinder. A piston rod through hole and a threaded portion 13 are formed in the center of the piston rod, and a mounting member 12 is removably screwed onto the piston rod 10 via these threaded portions 11 and 13. However, instead of the threaded portions 11 and 13, the mounting member 12 may be fixed by press-fitting or the like, or the mounting member 12, which is the mounting portion, may be formed by a part of the piston rod 10 itself. On the other hand, a push rod 14 for opening/closing the communication passage opening/closing valve of the piston portion is slidably inserted into the center of the piston rod 10, and its outer end protrudes from the end surface of the piston rod into the center of the interior of the mounting member 12. Furthermore, the mounting member 12 has rectangles facing each other on a straight line centered on the push rod 14;
Openings 15 and 16 consisting of elliptical and long holes are provided, and an operating lever 17 is inserted through both of these openings 15 and 16 from the lateral direction. Operation lever 1
For example, two engaging recesses 18, 1 are provided on the upper surface of one side of 7.
9, and the lower surface of the other side is formed into a uniform horizontal surface, and furthermore, a tapered surface 20 is formed at the lower end of the tip to enable horizontal insertion of the lever 17, and the engagement recess 1
8 and 19 engage the edges of the openings 15 and 16, and their flat lower surfaces abut against the top of the push rod 14. Since the engaging recesses 18 and 19 engage with the edges of the openings 15 and 16, the operating lever 17 can be tilted in any direction up or down using either of the edges of the openings as fulcrums a and b. I'm starting to be able to do it.

In addition, in FIG. 2, when the depth of the engaging recesses 18 and 19 is _l2 , and the distance between the lower surface of the other side of the lever 17 and the mouth edges of the openings 15 and 16 is _l1 , _l1 > _l2 . It is shaped like this.

Next, mounting of the operating lever 17 will be described.

When inserting the lever 17 from one opening 16 or 15 to the other opening, the push rod 14 is
is pushed down, and when the lever is pushed in, the lower surface of the lever remains in contact with the push rod 14, and when the engagement recesses 18 and 19 reach the openings 15 and 16, they are engaged by the push-up force from the push rod 14. Recesses 18 and 19 fit into the upper edges of openings 15 and 16. That is, push rod 14
The concave portions 18 and 19 of the operating lever are closed to both openings 15 and 16 by a force equivalent to the closing force caused by the gas pressure or spring force of an on-off valve (not shown) that pushes up the openings 15 and 16.
The operating lever 17 is pressed against the upper edge of the opening and cannot be removed, and the operation lever 17 can be easily installed with one touch.
In this state, the communication passage of the piston portion is closed by the on-off valve, and the telescopic device is in a locked state.

On the other hand, when removing the operating lever 17 due to the necessity of replacing parts, etc., push down the operating lever 17 against the push rod 14 within a range of length _l1 , and first press the openings 15 and 16 of the engaging recesses 18 and 19. When the engagement with the edge is released and from this state, for example, as shown in FIG. 2, the lever is pulled to the right, the lower surface of the lever 17 and the tapered surface 20 slide against the push rod 14 and can be pulled out. Therefore, the operation lever 17 can be freely and easily removed not only when it is attached, but also can be done with one touch, and parts can be easily replaced and repaired.

Next, regarding the operation, when the operating lever 17 is tilted upward in the direction A in the figure, the upper edge of the opening 16 becomes the abutting fulcrum b, and the tip of the lever is tilted downward, causing the push rod 14 to move upward. When the piston is pressed down, the opening/closing valve of the piston part is opened and the working fluid can be exchanged between the two chambers in the cylinder. The seat etc. can be adjusted and moved to any desired height by sliding, and by releasing the operating lever 17, the seat etc. can be locked and held at a desired position.

Further, when the operating lever 17 is tilted downward in the direction B in the figure, for example, the upper edge of the opening 15 serves as the abutment fulcrum a, and the rear part of the lever 17 tilts downward, making it possible to push down the push rod 14. This makes it possible to adjust the movement of the seat, etc. to any desired height in the same manner as described above.

Therefore, in the case of the illustrated embodiment, it is convenient because the push rod 14 can be pushed even if the operating lever 17 is tilted in either direction, for example, up or down, and the operating lever 17 can be moved in the lever axial direction during the tilting operation. Both openings 15,
Engagement recess 18, 1 of operation lever 17 on upper edge of 16
There is no wobbling when 9 is pressed.

In addition, in the embodiment of FIG. 2, the pressing force of the operating lever 17 is equivalent to the pressure of the sealed gas acting on the effective pressure-receiving area if the on-off valve (not shown) of the piston part constituting the telescoping device is a plunger valve type. The protruding force is transmitted through the push rod 14, and if the on-off valve of the piston part is of the closing spring biased type, the protruding force equivalent to the closing spring is used to provide a pressing force for preventing rattling. However, in both cases, the upper edges of the openings 15 and 16 and the engagement recesses 18 and 19 of the operating lever 17
Since it is necessary for the two to make contact with each other with the above-mentioned pressing force, instead of this, a coil spring is separately interposed on the lower side of the operating lever 17 inside the mounting member 12 to obtain the pressing force. You can also
When a pressing spring is separately provided in this way, dimensional control becomes very easy.

Furthermore, the length-adjustable telescoping device itself is not limited to the type described in the above embodiments; for example, the piston rod may be made to protrude below the cylinder, and the head of the push rod may be interlocked with a valve that opens and closes the communication passage within the cylinder. It may be a so-called inverted telescopic device configured to protrude from the end of the cylinder. In other words, the two members 10 and 12 in FIG. The handle may be integrally formed as a mounting part for the seat, etc. In this case, the opposing openings 15 and 16 through which the operating lever 17 is inserted may be formed at the upper end of the cylinder, and the operation at this time The installation procedure and operation procedure of the lever 17 are the same as in the previous embodiment.

Note that the operating directions A and B of the operating lever 17 shown in FIG. If it is used for adjusting the tilting angle, the operating directions (a) and (b) will inevitably be in two directions, front and rear or left and right. There is no difference in the ability to push the push rod 14 in any direction.

As explained above, the length-adjustable telescoping device operation lever mounting structure of the present invention allows the telescoping device to be easily installed by simply inserting the operating lever across openings provided facing each other. It can be attached to a mounting member, etc., and conversely, the lever 1
One side of the operating lever that the push rod comes into contact with is flat, so it can be pulled out smoothly by simply pushing down and pulling out 7. Compared to the conventional pivot pin method, there are fewer parts and the structure is simpler. Moreover, the lever installation and removal work can be done by an amateur customer such as a general household without the need of a skilled technician.
In addition to the effect that the manufacturer's packaging at the time of shipment can be made more compact with the operating lever removed, the operating lever mounting structure of the present invention allows the operating lever to be moved up and down, forward and backward, or left and right, etc. The lever can be tilted in either of two different directions depending on the situation, and the opening/closing valve that constitutes the telescoping device can be released by operating the operating lever in either direction. Not only is it convenient, even a first-time operator can immediately adjust the height, angle, etc. of the seat, table, etc. equipped with the telescoping device without having to worry about the operating direction, but the operating lever is also convenient. There are no restrictions on the operating direction or mounting direction of the lever, and there is no risk of the operator accidentally rotating the lever in the opposite direction, resulting in bending or damage, unlike conventional pivot-type operating levers. It has various excellent effects, such as being able to avoid problems.

Furthermore, by configuring the mounting portion of the present invention, which is provided with opposing openings for passing the operating lever, to be detachable from the end of the piston rod or cylinder from which the push rod constituting the telescoping device projects, Even after the operating lever is once installed, it is advantageous that the operating lever can be easily removed when the telescoping device itself is replaced and can be reused for a new telescoping device.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing a conventional length-adjustable telescoping device of this kind when it is used as a height-adjusting column for a chair, and Fig. 2 is an operation of the length-adjustable telescoping device according to the present invention. FIG. 2 is a partially cutaway vertical side view showing one embodiment of a lever mounting structure. 10...Piston rod, 12...Mounting member,
15, 16...opening, 17...operation lever, 1
8, 19... Engagement recess, a, b... Fulcrum.

Claims (1)

[Scope of Claims] 1. A length-adjustable telescopic device body is constituted by a cylinder filled with pressure fluid and a piston rod telescopically inserted into the cylinder via a piston, and is partitioned by the piston. One of the pillars of a chair, table, etc. is provided with a passage that communicates two rooms and an on-off valve that opens and closes this passage, and an operating lever that pushes the head of the push rod from the outside that opens and closes this on-off valve. In the length-adjustable telescoping device constituting the above-mentioned push rod, openings facing each other on a straight line crossing the center of the push rod are formed in the mounting portion of the seat or the like located outside the protrusion of the push rod, and both openings are also An engaging recess is formed on one side of the operating lever to receive the edges of the openings, and the other side of the operating lever is flattened and brought into contact with the head of the push rod. The lever is configured such that the push rod can be pushed during any of these tilting operations while the lever is latched so as to be tiltable in one direction and the other using the rim of one of the openings as a fulcrum. Operation lever mounting structure for adjustable telescoping device. 2. The operating lever mounting structure for a length-adjustable telescoping device according to claim 1, wherein the mounting portion is a cylinder constituting the length-adjustable telescoping device. 3. The operating lever mounting structure for a length-adjustable telescopic device according to claim 1, wherein the mounting portion is a piston rod constituting the length-adjustable telescopic device. 4. The operating lever mounting structure for a length-adjustable telescoping device according to claim 1, wherein the mounting portion is a separate mounting member mounted and fixed on a cylinder or piston rod constituting the length-adjustable telescoping device.