JPH10155592A - Height adjuster for armrest for chair for desk work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for easily adjusting the height of an armrest. SOLUTION: Concerning this height adjuster for an armrest for a chair for desk work, a guide cylinder 3 is inserted to an exterior cylinder 1 equipped with an armrest panel 2 at its upper end so as to freely get in/get out of a supporting cylinder 4, and a longitudinally long hole 7 is formed on the upper side of the supporting cylinder 4. Then, a lock pin 9 to be selectively locked at any arbitrary receiver part 6 through this longitudinally long hole 7 and a laterally long guide hole 8 formed on the guide cylinder 3 is bridged between side part elements 10b and 10b arranged inside the exterior cylinder 1 while sandwiching the supporting cylinder 4 at an operating frame 10 composed of a central part element 10a and a pair of side part elements 10b and 10c successively formed while facing the central part element 10a. Besides, a spring element 13 to be energized in a certain direction so as to fit and lock the lock pin 9 to the receiver part 6 is successively fitted at the side part element 10b freely turnably assembled with the exterior cylinder 1. Then, the central part element 10a of operating frame 10 to be pressed with the tip of finger against the energization of spring element 13 is engaged with a window 14 formed on the exterior cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armrest height adjusting device for an office chair.

[0002]

2. Description of the Related Art For example, as disclosed in Japanese Utility Model Laid-Open No. 60-54452, a pair of guide rods are arranged side by side on an upper support rod supporting an armrest, and an adjustment hole is provided on an adjustment plate provided between the guide rods. The guide rod and the adjusting plate are fitted inside the lower supporting rod so as to be able to move up and down, and the adjusting shaft is engaged with the engaging hole provided in the adjusting hole stepwise to adjust the height. And a separate coil spring is attached to the adjusting shaft so as to maintain a state of engagement with an arbitrary engaging hole of the adjusting shaft.

[0003]

In the above prior art, it is necessary to press the adjusting shaft in the axial direction and move the armrest up and down while maintaining the pressed state. There is.

The present invention has been made with the object of providing an apparatus which can easily perform an operation for adjusting the height of an armrest.

[0005]

Means for Solving the Problems A guide cylinder having an upper end mounted on the armrest board is housed in an outer cylinder having an armrest board at the upper end, and the guide cylinder is mounted on a support tube standing upright on the seat board. A vertically long hole formed by a vertically elongated guide portion and a receiving portion arranged stepwise at one end along the longitudinal direction of the guide portion is provided on the upper side of the support tube. A locking pin, which is provided in the hole and the guide tube and penetrates the horizontally long guide elongated hole and is selectively locked to any of the receiving portions, is provided continuously with the center piece and the center piece. An operation frame composed of a pair of side pieces is provided between the side pieces disposed inside the outer casing with the support tube interposed therebetween, and is rotatably assembled to the outer casing at an upper side. The side piece is provided with a spring piece having a free end in contact with the armrest board side and biasing the locking pin in a direction of fitting and locking to the receiving portion. The middle piece of the operation frame for pressing a fingertip against the bias of a configuration that is engaged in window provided in the outer tube.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an embodiment of an apparatus for adjusting the height of an armrest in an office chair according to the present invention.
2 is a sectional view taken along the line 1A-1A of FIG. 1, and FIG.
It is 1B line sectional drawing.

Reference numeral 1 denotes an outer casing having a rectangular cross section having an armrest board 2 at the upper end. A guide cylinder 3 having an upper end assembled to the armrest board 2 is housed in the outer casing 1, and the guide cylinder 3 is seated. Board (not shown)
Is inserted and inserted freely into and out of the support tube 4 installed upright.

In the embodiment, the guide tube 3 is provided with a cross-sectional shape portion in which two circular members are connected, but this is an operation wire for adjusting the inclination angle of the backrest (not shown). 30 is inserted into a fixed position, and may have an oval cross section that matches the oval cross section of the support tube 4.

However, according to the embodiment, the guide cylinder 3
Since the contact area with the inside of the support 4 is reduced, the support 4
The vertical movement operation of the guide tube 3 along the direction can be performed smoothly.

A vertically long guide portion 5 is provided on the upper side of the support tube 4 and receiving portions 6,... Holes 7 and 7 are provided opposite to each other, penetrate through the vertically long hole 7 and the horizontally long guide hole 8 provided in the guide tube 3, and are selectively provided at any of the receiving portions 6. A lock pin 9 is locked to the side pieces 10b and 10b of the operation frame 10.

The operation frame 10 includes a central piece 10a and a pair of side pieces 10b, 10a connected to the central piece 10a.
b, and the side pieces 10b and 10b are arranged inside the outer casing 1 so as to sandwich the support cylinder 4, and the side pieces 10b
b and 10b are provided with locking pins 9.

The operation frame 10 engages a pin 11 projecting from an upper portion of the side piece 10b with a receiving cylinder 12 formed inside the outer cylinder 1 so as to be rotatable with the outer cylinder 1. Assembly,
A spring piece 13 is provided at the upper end of the side piece 10b so that a free end contacts the armrest board 2 side and urges the locking pin 9 in a direction of fitting and locking to the receiving portion 6. .

In the embodiment, the free end of the spring piece 13 is indirectly brought into contact with the armrest board 2 with the guide tube piece 3a for fitting and fastening to the armrest board 2, but it may be direct. .

The operation frame 10 rotates about the pin 11 by pressing the center piece 10a with a fingertip against the bias of the spring piece 13, and the center piece 10a is , And can be pressed by a fingertip from outside.

The operation frame 10 and the spring piece 13 connected thereto are made of synthetic resin.

The operating frame 10 engaged with the window 14
When the center piece 10a is pressed, the operation frame 10
3 rotates around the pin 11 engaged with the receiving cylinder 12 and simultaneously releases the locking pin 9 bridged on the side pieces 10b and 10b from the receiving portion 6. It moves to the guide portion 6 of the vertically long hole 7. As a result, the outer cylinder 1 provided with the armrest board 2 and the guide cylinder 3 housed inside the outer cylinder 1 and the operation frame 10 assembled to these cylinders 1 and 3 by the locking pins 9 and 11 4, free in relation to
With the center piece 10a of the operation frame 10 pressed as described above, the outer tube 1 and the like can be vertically moved as it is (while holding the outer tube 1 while pressing the center piece 10a),
When the pressed state is released at the desired position, the operation frame 10 returns to the original position by the urging of the spring piece 13, and the locking pin 9 engages with the appropriate receiving portion 6 to perform the armrest height adjusting operation. It is done.

[0017]

The present invention has the configuration described above,
The height of the armrest can be adjusted by simultaneously performing the pressing operation of the operation frame and the vertical movement of the armored cylinder provided with the armrest with one hand, so that the adjustment operation can be performed easily.

Further, since the spring piece is integrated with the operation frame, the number of parts can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view.

FIG. 2 is a sectional view taken along line 1A-1A in FIG.

FIG. 3 is a sectional view taken along line 1B-1B of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior cylinder 2 Armrest board 3 Guide cylinder 4 Support cylinder 5 Guide part 6 Receiving part 7 Vertical long hole 8 Guide long hole 9 Locking pin 10 Operation frame 13 Spring piece 14 Window

Claims (1)

[Claims] 1. A guide cylinder having an upper end mounted on an armrest board is housed in an exterior cylinder having an armrest board at an upper end, and the guide cylinder is fitted to a support cylinder standing upright on a seat board so as to be able to move in and out. A vertically long hole comprising a vertically elongated guide portion and receiving portions arranged stepwise at one end along the longitudinal direction of the guide portion is provided on the upper side of the support tube, and the vertically elongated hole and the guide are provided. A pair of locking pins, which are provided on the cylinder and penetrate through the horizontally long guide elongated holes and are selectively locked to any of the receiving portions, are provided with a central piece and a pair of sides connected to the central piece. The side piece of the operation frame consisting of a part piece is installed between the side pieces arranged inside the outer case with the support tube interposed therebetween, and is rotatably assembled to the outer case at an upper side. In
A free end is in contact with the armrest board side, and a spring piece is provided in series to urge the locking pin in a direction in which the locking pin is fitted and locked to the receiving portion,
An armrest height adjusting device for an office chair, wherein the central piece of the operation frame pressed by a fingertip against the bias of the spring piece is engaged with a window provided in the outer casing.