JP2973088B2 - Height adjustment devices such as armrests for chairs - Google Patents

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 a chair can be adjusted stepwise by a simple operation according to the body shape and work contents of a seated person. The present invention relates to a height adjusting device.

[0002]

2. Description of the Related Art Conventionally, the height of an armrest can be adjusted in order to adjust the position of an arm depending on the occupant's body shape and the position of the arm when operating a computer keyboard or mouse. Chair, for example, Japanese Utility Model Publication No. 63-130,
And Japanese Utility Model Publication No. 4-46607.

[0003]

However, in the former invention, since the knob, which is the operation part, protrudes to the side of the support rod, a seated person or a third party carelessly touches this knob,
There is a problem that the lock is released and the height of the armrest changes. In the latter, since the operating portion of the operating lever faces the lower surface of the substantially horizontal armrest, the former problem is solved, but the operating lever and the locking rod are linked by a connecting rod. Therefore, it takes time to assemble the device, and the locking rod is pivotally supported at the intermediate portion by the guide rod,
And, since the claw piece formed at the lower end of the locking rod is adapted to engage with the locking hole provided 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 However, it may be deformed or damaged, resulting in malfunction.

[0004] An object of the present invention is to solve such a problem, and to easily adjust the height of the elbow rest when the user of the chair changes or the work content changes, while sitting. In addition, even if the lock is released by accidentally touching the operation unit, the height of the armrest does not change, and the structure is simple, easy to assemble, and the armrest of the chair excellent in strength Etc. are provided.

[0005]

According to the present invention, the above-mentioned problem is solved as follows. (1) A supporting rod for supporting an armrest or the like of a chair includes a lower supporting rod and an upper supporting rod fitted slidably in a longitudinal direction with respect to the lower supporting rod. At the same time, an adjusting hole formed by a plurality of engaging holes in the left-right direction substantially vertically arranged at a predetermined interval and a communication hole extending in the substantially vertical direction communicating with each engaging hole beside these engaging holes. And an engagement shaft that engages with the adjustment hole is attached to the upper support rod.
With slidably mounted slightly front-upper支杆
The upper part is pivotally attached to the upper part of the front so that it can rotate in the front and rear direction
The extension of the operation lever extending into the upper support rod
A forked portion is formed at the tip, and the forked portion is
By engaging with the joint shaft, the engaging shaft can be
An urging means is provided which is movable and further elastically urges the operation lever in a direction in which the engagement shaft engages with the engagement hole.

(2) In the above item (1), the supporting rod is composed of a cylindrical lower supporting rod and a cylindrical upper supporting rod, and the guide hole opening below the upper supporting rod is provided with the supporting rod. The lower support rod is slidably fitted inside.

[0007] (3) above (1) or (2) in the section, the upper
A slot in the front-rear direction is formed on the inner wall of the
The engagement shaft is fitted in the unit so that it can be moved in the front-rear direction .

[0008]

[0009]

[0010]

1 shows a chair embodying the present invention.
It is a side view of (A), and an armrest (1) of height adjustment type on both sides
Is erected. FIG. 2 shows this armrest (1) in an enlarged longitudinal section.

The armrest (1) is supported by an armrest by a support rod (2).
According to the present invention, the supporting rod (2) comprises a cylindrical lower supporting rod (2a) rising from the bottom of the seat and a lower supporting rod (2a). ), A cylindrical upper support rod (2b) fitted outside so as to be slidable in the longitudinal direction.

[0012] In this embodiment, the lower支杆(2a) has an oval or elliptical cross-sectional shape, the upper end is made by the opening to Rukin genus pipe. The upper support (2b) is open at the bottom.
Guide has a hole (10), there is a plastic molding having an inner surface shape that fits to the lower portion支杆(2a) that. Upper support
An elbow pad (3) is attached to the top of (2b).

At the upper part of the lower support (2a), on both sides thereof,
A plurality (six in the illustrated case) of engagement holes (4a) which are arranged in the vertical direction at a predetermined interval and extend in the horizontal direction, and each of the engagement holes (4a) at the side (the right side in FIG. Engagement hole (4a)
An adjustment hole (4) is formed, which is formed of a communication hole (4b) extending substantially vertically, which communicates with the control hole.

On the other hand, at an important part of the upper supporting rod (2b), an engaging shaft (5) for engaging with the above-mentioned adjusting hole (4) is formed on the inner wall of the upper supporting rod (2b). It is fitted and installed in the slot (6). This state is clear from FIG. The slot (6) has a length in the front-rear direction sufficient to move the engagement shaft (5) from the engagement hole (4a) to the communication hole (4b) or vice versa.

An engaging shaft (6) is provided inside the upper support rod (2b).
The fork (7) at the tip of the extension (7a) of the operating lever (7)
b) is hooked. The operation lever (7) has its upper part pivotally mounted on a pin (8) near the top of the upper support rod (2b) so as to be rotatable in the front-rear direction. The front part (7c) of the operating lever (7) is exposed at the front part of the upper supporting rod (2b), and a leaf spring (9) is stretched between the upper supporting rod (2b) and the rear surface thereof. Have been.

With such a configuration, when the front part (7c) of the operating lever (7) is pushed against the force of the leaf spring (9) from the state shown in FIG. Rotates about the pin (8), and the engagement shaft (5) sandwiched between the forked portions (7b) moves in the slot (6) formed on the inner wall of the upper support rod (2b). Is transferred to the communication hole (4b).

In this state, if the elbow pad (3) is lifted from below, the upper support (2b) slides together with the engagement shaft (5) and is lifted from the lower support (2a). FIG. 4 shows this state.

At this time, let go of the operating lever (7),
When the upper supporting rod (2b) is slightly moved in the vertical direction, the force of the leaf spring (9) causes the engaging shaft (5) to engage with the nearest engaging hole (4a). Thus, the armrest (3), ie, the armrest
(1) can be adjusted to any desired height position.

[0019]

According to the present invention, the height of the elbow rest can be easily adjusted in a seated state by a simple operation of the operation unit when the user of the chair changes or the work content changes.

The load applied to the armrest from above is:
The force is transmitted from the left and right engagement shafts fitted to the key points of the upper support rod to the engagement holes of the lower support rod, and no force is directly applied to the operation lever portion separated from the engagement shaft. Therefore, even when a large load is applied to the armrest, the operation section does not deform or break and does not malfunction.

Further, the upper part of the operation lever is positioned in front of the upper support rod.
It is pivotally attached to the upper part so that it can rotate in the front-rear direction, and
The extended portion of the extended operation lever is engaged with an engagement shaft.
While the occupant is sitting on the chair, grasp the upper
Adjust the height of the armrest by easily operating the operation unit while watching
Can be locked, and even if you
There is no fear that the height of the armrest will change due to the release of the lock,
Moreover, the structure is simple and easy to assemble.

According to the second aspect of the present invention, the support rod is
It is divided into a cylindrical lower support and a cylindrical upper support,
The lower rod is inserted into a guide hole that opens below the upper rod.
When slidably fitted inside, the height other than the operation part of the operation lever
The adjustment mechanism can be completely contained in the guide hole,
Can be done.

[Brief description of the drawings]

FIG. 1 is a side view of a chair provided with an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional side view of an armrest of the chair shown in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a view similar to FIG. 2, showing a state during operation.

[Explanation of symbols]

 (A) Chair (1) Armrest (2) Support rod (2a) Lower support rod (2b) Upper support rod (3) Elbow rest (4) Adjustment hole (4a) Engagement hole (4b) Communication hole (5) (6) Slot (7) Operation lever (7a) Extension (7b) Bifurcation (7c) Front (8) Pin (9) Leaf spring (biasing means) (10) Guide hole

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Naoki Numa 2-7-18 Kitako, Nishi-ku, Yokohama-shi Okamura Works, Ltd. (56) References JP-A-7-327775 (JP, A) European Patent Application Publication 587537 (EP, A1) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47C 7/54

Claims (3)

(57) [Claims] 1. A supporting rod for supporting an armrest or the like of a chair comprises a lower supporting rod and an upper supporting rod slidably fitted in a longitudinal direction with respect to the lower supporting rod. An adjusting hole comprising a plurality of engaging holes in the left-right direction arranged substantially vertically in the supporting rod at a predetermined interval, and a communication hole extending substantially vertically in communication with each engaging hole beside these engaging holes. was bored, the engaging shaft that engages with the regulating hole, the upper支杆, with slidably mounted slightly back and forth direction, the upper
The upper part is pivoted on the front upper part of the support rod, so that it can rotate in the front-rear direction.
Extending into the upper support rod of the set operating lever
Form a forked part at the tip of the part, and
By engaging with the engagement shaft, the engagement shaft is moved forward and rearward.
In which the operating lever is resiliently biased in a direction in which the engaging shaft engages with the engaging hole. Adjustment device. 2. The supporting rod comprises a cylindrical lower supporting rod and a cylindrical upper supporting rod, and the lower supporting rod is slidably inserted into a guide hole opened below the upper supporting rod. The height adjusting device for an armrest of a chair according to claim 1, wherein the height adjusting device is fitted inside. 3. A slot in the front-rear direction is provided on the inner wall of the upper support rod.
Formed in this slot, the engaging shaft can be moved in the front-back direction
The height adjusting device for an armrest or the like of a chair according to claim 1, wherein the height adjusting device is fitted .