JPH09173179A - Height adjustment device for chair armrest or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the height of an armrest in a seated condition and ensure freedom from a concern about the change of the height of the armrest even in the case of the release of a lock due to an unexpected touch on an operation part. SOLUTION: A vertical rod to support an armrest is formed out of an upper support rod and a lower support rod 4, and the upper support rod is formed to have a guide hole 7 open at the lower end. Furthermore, an adjustment hole 6 made of a plurality of coupling holes 6a vertically arranged and directed right and left, and a communication hole 6b formed vertically along the coupling holes 6a for communication thereto, is drilled through the lower support rod. Also, an operation lever 11 laid on the forward part of the upper support rod has an upper end connected to the surface thereof so as to be capable of turning. The lower end of the lever 11 is passed through a communication hole 6b, and laid so as to cover the neighborhood of both ends of an engagement shaft 13 coupled to a depthwise slot 14 on an inner wall at both sides of the upper support rod.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair armrest or the like in which the height of the armrest or the like of the chair can be adjusted stepwise by a simple operation according to the body shape of the seated person and the work content. Height adjustment device.

[0002]

2. Description of the Related Art A chair in which the height of an elbow pad can be adjusted in order to adjust the position of the arm depending on the body shape of the person and the supporting position of the arm when operating a computer keyboard or mouse , Japanese Utility Model Publication No. 63-130, Japanese Utility Model Publication No. 4-46607, etc., and are known.

[0003]

However, in the former device, since the knob, which is the operating portion, projects to the side of the supporting rod, a seated person or a third person carelessly touches this knob.
There is a problem that the lock is released and the height of the armrest changes. In the latter, on the lower surface of the almost horizontal armrest,
Since the operation part of the operation lever is exposed, the former problem is solved, but since the operation lever and the locking rod are linked by the connecting rod, it takes time to assemble the device, and The locking rod is pivotally supported in the middle by the guide rod,
Moreover, since the claw piece formed at the lower end of the locking rod engages with the locking hole formed in the lower support rod, when a large load is applied to the armrest, the lower part of the locking rod and the claw piece are deformed or It may be damaged and cause malfunction.

In order to solve such a problem, the present invention makes it possible to easily adjust the height of the elbow pad when the user of the chair changes or the work content changes while the seated state is kept. Even if you touch the operation part carelessly, there is no risk that the lock will be released and the height of the armrest will change, and the structure is simple and easy to assemble. An object is to provide a height adjusting device.

[0005]

According to the present invention, the above-mentioned problem is solved as follows. (1) A supporting rod for supporting an armrest of a chair and the like, which is oriented in the vertical direction, is composed of an upper support rod and a lower support rod, and the upper support rod has a lower opening and faces the vertical direction. A guide hole that can be slidably fitted is provided, and the lower support bar has a plurality of laterally-aligned engagement holes that are arranged in a substantially vertical direction at intervals, and these engagement holes beside these engagement holes. An adjusting hole is formed which is in communication with the upper support rod and extends in the front-rear direction. An engagement shaft that is pivotally movably supported and that engages with a slot extending in the front-rear direction that is inserted into the communication hole and that extends in the inner walls on both sides of the upper support rod is coupled to the lower end thereof.

(2) In the above item (1), an opening is formed in the upper front part of the upper support rod, and the operation part of the operation lever is projected forward from this opening.

[0007]

1 shows a chair embodying the present invention.
It is a front view of (A), and the height-adjustable armrests (1) on both sides.
Is erected. 2 shows the armrest (1) in a disassembled state, and FIG. 3 shows the armrest (1) in an enlarged manner in a longitudinal section.

The armrest (1) is supported by the support rod (2).
According to the present invention, the support rod (2) is a lower support rod (4) that stands up from under the seat portion.
And a cylindrical upper support rod (5) fitted on the lower support rod (4) so as to be slidable in the longitudinal direction.

The lower support rods (4) extend substantially vertically, and a plurality of hollow lower portions (4a) are arranged substantially vertically in the hollow upper portion (4a) and extend in the left-right direction (5 in the case shown).
Individual) engaging holes (6a) and the sides of these engaging holes (6a) (in the case of this embodiment, the rear side, that is, the right side in FIG. 3) communicates with each engaging hole (6a) and extends substantially vertically. Communication hole (6b)
An adjustment hole (6) consisting of and is formed in the left-right direction.

As shown in FIG. 2, the upper support rod (5) is a half part.
A combination of (5a) and (5b) is provided with a guide hole (7) extending substantially vertically and having a lower opening. This guide hole
The upper portion (4a) of the lower support rod (4) is slidably fitted in the inside (7). At the top of the upper support rod (5), the lower half of the elbow rest
(3a) is fixed by a screw (8), and the upper half of the elbow pad (3b) is fixed by a screw (9) on the lower half of the elbow pad (3a).

An opening (10) is provided in the front upper part (left side in FIGS. 2 and 3) of the upper support rod (5), and an operating lever (11) is provided in the opening (10). The upper end of the operation lever (11) is pivotally attached to the upper support rod (5) by a pin (12) so as to be rotatable in the front-rear direction. The bifurcated lower end of the operating lever (11) is pivotally supported near the end of the engaging shaft (13) inserted into the engaging hole (6a) with the upper part (4a) of the lower supporting rod (4) interposed. doing.

As shown in FIG. 2, the engagement shaft (13) has a slot (14) in the front-rear direction formed in the inner wall of the upper support rod (5).
Both ends are fitted so that they can move back and forth. This slot (14)
Is the engagement shaft (13) from the above-mentioned engagement hole (6a) to the communication hole (6b),
Alternatively, it has a sufficient length in the front-rear direction to move it in the opposite direction.

The operation lever (11) has an inner portion and a lower support rod.
The leaf spring (1) stretched between the upper part (4a) and the front surface of (4a)
It is elastically biased forward by 5).

With such a structure, when the operating portion of the operating lever (11) is pushed against the force of the leaf spring (15) from the state shown in FIG. 3, the operating lever (11) is pushed. ) Is the pin (1
The engaging shaft (13), which is rotated about 2) and is sandwiched by the forked lower end, is a slot formed on the inner wall of the upper support rod (5).
It moves inside the (14) and is transferred from the engagement hole (6a) to the communication hole (6b).

In this state, when the elbow pad (3) is lifted from below, the upper support rod (5) slides together with the engagement shaft (13) and is lifted from the lower support rod (4). At this time, if the upper lever (5) is moved slightly up and down by releasing the operating lever (11), the force of the leaf spring (15) causes the engagement shaft (13) to move to the nearest engagement hole ( 6a) is engaged. In this way,
The armrest (3) or armrest (1) can be adjusted to any desired height position.

[0016]

According to the present invention, although the engaging shaft is always engaged with the engaging hole and the armrest is held at one of the set heights, the height of the armrest can be changed. If you want,
When the operating lever is operated against its elastic bias, the engaging shaft engaged with the engaging hole slides in the direction opposite to the engaging direction with the engaging hole, and extends vertically. Upon reaching the hole, the engagement shaft can be moved in this communication hole, so that the height of the armrest can be changed.

If the operation lever is stopped after moving the armrest to the height to be adjusted, the operation lever will be
The engagement shaft is engaged with the nearest engagement hole by elastic biasing. In this way, the height of the elbow pads can be adjusted easily by grasping the upper supporting rod with your hand when the user of the chair changes or the work content changes by simply operating the operation lever. It can be done by operating the operating lever. Even if the operation lever is touched carelessly, there is no possibility that the lock will be released and the height of the armrest will change, and the structure is simple and the assembly can be easily performed.

Since the load applied to the armrest from above is directly transmitted to the lower support bar through the engagement shaft supported by the slot of the inner wall of the upper support bar, even if a large load is applied to the armrest, the operation can be performed. The lever will not be deformed or damaged and malfunction will not occur.

Since the left and right sides of the lower support rod are sandwiched by the bifurcated lower end of the operating lever, the engaging shaft can be held from both sides, and deformation and damage of the engaging shaft and the operating lever can be prevented.

According to the second aspect of the present invention, when an opening is formed in the front upper part of the upper support rod and the operation part of the operation lever is projected forward from this opening, the appearance of the operation part is improved. can do.

[Brief description of the drawings]

FIG. 1 is a front view of a chair equipped with an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the armrest of the chair shown in FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

[Explanation of symbols]

 (A) Chair (1) Armrest (2) Support rod (3) Elbow rest (3a) Elbow rest lower half (3b) Elbow rest upper half (4) Lower support rod (4a) Upper part (5) Upper support rod (5a) (5b) Half (6) Adjustment hole (6a) Engagement hole (6b) Communication hole (7) Guide hole (8) (9) Screw (10) Opening (11) Operating lever (12) Pin (13) Engaging shaft (14) Slot (15) Leaf spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Numa 7-18 Kitako, Nishi-ku, Yokohama-shi Okamura Manufacturing Co., Ltd.

Claims (2)

[Claims] 1. A support rod for supporting an armrest of a chair and the like, which is oriented in the up-down direction, is composed of an upper support rod and a lower support rod, and the upper support rod has a lower portion open and faces in the up-down direction.
A guide hole into which the lower support rod can be slidably fitted is provided, and the lower support rod is provided with a plurality of laterally-aligned engaging holes spaced apart in a substantially vertical direction, and at the sides of these engaging holes, An adjustment hole is formed which is in communication with these engagement holes and which has a communication hole extending substantially in the vertical direction. The upper end of the operation lever provided at the front portion of the upper support rod is moved forward and backward on the upper portion of the upper support rod. Rotatably pivotable in a direction, and the lower end thereof is coupled with an engaging shaft which is inserted into the communication hole and engages with slots extending in the front-rear direction formed in the inner walls on both sides of the upper support rod. Height adjustment device for chair armrests, etc. 2. An armrest or the like for a chair according to claim 1, wherein an opening is formed in the front upper portion of the upper support rod, and the operation portion of the operation lever is projected forward from this opening. Height adjustment device.