JPH10127405A - Chair assembling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify assembling of a chair provided with a lever for height adjustment to decrease the manufacturing cost. SOLUTION: A box-shaped fixed frame is provided on an upper end of a support formed by a gas spring 4, and a release button 6 to make the gas spring 4 freely expandable is formed projectingly within the fixed frame. A height adjusting lever 2 is inclinably supported by a pin 8 rotatably supported by a bearing member 7 provided within the fixed frame. The tip end of the height adjusting lever 2 is positioned over the release button 6 facing with it. An escape preventive member 23 is integrally formed with the back surface of a plate supporting board 11 fixed on a fixed frame by a screw 24. The escape preventive member 23 faces to the end of the pin 8 to prevent its escape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly structure of a chair mainly used for office work.

[0002]

2. Description of the Related Art As shown in FIG. 1, a chair having a telescopic gas spring as a support is provided by operating a knob 3 of a height adjusting lever provided at a lower portion of a seat plate 1 upward. The height of the seat plate 1 can be freely set. That is, as shown in the longitudinal sectional view of FIG. 2, the release button 6 of the gas spring 4 is projected into a box-shaped fixed frame 5 fixed to the upper end of the gas spring 4, and A bearing piece 7 is provided, and a height adjustment lever 2 is tiltably supported by a pin 8 supported by the bearing piece 7,
The distal end 9 of the height adjusting lever 2 is opposed to the release button 6 and the knob 3 is lifted up so that the distal end 9 pushes down the release button 6 so that the air in the gas spring 4 can freely enter and exit. When the gas spring 4 becomes freely expandable and contractable and the seat plate 1 can be adjusted to an appropriate height, the release button 6 returns to its original position by releasing the knob 3 when the hand is released, so that expansion and contraction of the air cannot be performed. The seat plate 1 is configured to be held at that height.

[0003] Although not shown, a tilt adjusting lever (not shown) for enabling the tilt angle of the backrest 10 and the seat plate 1 to be set arbitrarily is provided in the fixed frame 5 in the same manner as the lever 2. A chair supported by a pin so as to be tiltable is also known.

[0004]

Conventionally, an E-ring or a split pin is attached to the end of the above-mentioned pin in order to prevent the pin from being pulled out during use. Providing such a structure requires a lot of time and labor for mounting and molding, which is one factor that cannot reduce the manufacturing cost. The same applies to a pin that supports the above-described tilt adjustment lever so that it can be tilted into the fixed frame 5.

[0005]

Accordingly, the present invention naturally prevents the pin from being removed by assembling the seat plate support plate 11 to the fixed frame 5 without providing the pin itself with the retaining means as described above. It is an object of the present invention to provide an assembly structure of a chair that can be operated.

For this purpose, according to the present invention, a box-shaped fixing frame is provided at the upper end of a support made of a gas spring. A bearing piece is provided in the fixed frame and supported so as to be tiltable by a pin supported and supported, and a tip end of the height adjustment lever is opposed to the release button,
A retaining piece is integrally formed on the lower surface of the seat plate supporting plate screwed onto the fixed frame to face the end of the pin by a screw to prevent the pin from being pulled out.

[0007]

Next, an embodiment of the present invention will be described with reference to FIGS. Note that, in the figure, the same reference numerals as those in FIGS. 1 and 2 denote the same parts, and a duplicate description thereof will be omitted. In the figure, reference numeral 12 denotes a window hole formed on one side surface of the fixed frame 5 for projecting the lever 2, and reference numerals 13 and 14 denote cylindrical covers surrounding the gas spring 4. A flange 15 is formed on the periphery of the fixed frame 5, and screw holes 16, 16... For assembly and a through hole 17 for positioning are formed in the flange 15. The seat plate support plate 11 is integrally formed of plastic, and the seat plate 1 is attached to the upper surface thereof. The seat plate support plate 11
Is formed in a dome-shaped lower surface, and a concave portion 20 corresponding to the fixing frame 5 is formed at a center portion thereof. A through hole 21 corresponding to the screw hole 16 and the screw hole 1 are formed in the concave portion 20.
Positioning pins 22 corresponding to 6 are respectively formed.

Reference numeral 23 denotes a retaining piece integrally formed on the lower surface of the seat plate support plate 11 so as to face the end of the pin 8 so as to hang down. Thus, the positioning pin 22 is
Are fixed to the fixed frame 5 so that the recesses 20 of the seat plate support plate 11 are attached to the fixed frame 5, and the screws 24, 24. The board 11 is screwed to the fixed frame 5. At this time, as shown in FIG. 4, the retaining piece 23 faces the end of the pin 8, and the removal of the pin 8 is prevented.

The backrest 10 is pivotally supported by a pin 27 in which a board portion 26 of a stay 25 is inserted transversely into the fixed frame 5 and is supported by a spring 28 so as to be elastically tiltable. When the seat plate support plate 11 is screwed to the fixed frame 5, both ends of the pin 27 oppose a pair of retaining pieces 29 formed on the inner wall surface of the recess 20 as shown in FIG. For this reason, the pin 27 is also prevented from being pulled out by this assembly.

In this embodiment, the locking of the pin 27 and the pin 8 has been described. However, a tilt adjusting lever (not shown) for adjusting the tilt angle of the seat plate 1 and the seat plate support plate 11 is fixed to a fixed frame. In the chair of the structure supported in 5,
The retaining piece of the pin is also used for the seat plate support plate 1 as in this embodiment.
1 can be integrally formed on the lower surface.

[0011]

As described above, according to the chair assembly structure of the present invention, the retaining plate formed on the seat plate support plate is fixed to the end of the pin by screwing the seat plate support plate on the fixed frame. Since the pins are opposed to each other and are naturally prevented from being removed, there is no need to provide a locking means on the pins themselves, so that assembly is facilitated and the number of required parts can be reduced, so that there is an effect that manufacturing costs are reduced.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a chair according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of FIG. 1;

FIG. 3 is an exploded perspective view of the chair according to the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a sectional view taken along line BB of FIG. 2;

[Description of Signs] 1 Seat plate 2 Lever 4 Gas spring 5 Fixing frame 6 Release button 7 Bearing piece 8 Pin 9 Tip part 11 Seat plate support board 15 Flange 16 Screw hole 20 Depressed recess 23 Stopping piece 24 Screw

Claims (1)

[Claims] 1. A box-shaped fixing frame is provided at the upper end of a support made of a gas spring, and a release button for allowing the gas spring to expand and contract is protruded into the fixing frame. A bearing piece is provided so as to be tiltable by a pivotally supported pin, the tip of the height adjustment lever is opposed to the release button, and is mounted on the lower surface of a seat plate support plate screwed onto the fixed frame. The assembling structure of a chair, wherein a stopper piece is formed integrally with the end of the pin by a screw to prevent the pin from being pulled out.