JPH0257444U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is an overall perspective view of a chair incorporating the backrest plate height adjustment device of the present invention, Figure 2 is an exploded perspective view showing the main parts of the invention, and Figure 3 is a longitudinal cross-section of the main parts in the assembled state. 4 is a rear view of the main parts in the assembled state, FIG. 5 is a cross-sectional view taken along the line X--X in FIG. 4, and FIG. 6 is a cross-sectional view taken along the line Y--Y in FIG. Figure 7 is a partial perspective view of the main parts showing another embodiment of the operation button and board of the operation member, Figure 8 is a partial vertical side view of the same, and Figure 9 is a locking part of the backrest rod and support for the operation member. It is a partial longitudinal cross-sectional side view of the principal part which shows another Example of a part. A: Backrest plate, B: Backrest rod, C: Operation member,
D: Slide rod, E: Slider, 1: Leg, 2
: Seat part, 3: Cushion, 4: Back plate, 5: Back cover, 6: Bent part, 7: Straight part, 8: Back part, 9: Locking part, 10: Opening, 11: Through hole, 12: Engagement Matching hole, 13: Large hole, 14: Small hole, 15: Substrate, 16:
Support part, 17: Claw piece, 18: Hole, 19: Front surface, 2
0: Support ring, 21: Operation button, 22: Protrusion, 2
3: Compression coil spring (elastic body), 24: Flange, 2
5: Neck, 26: Stopping piece, 27: Side, 28: Side plate, 29: Holding piece, 30: Mounting plate, 31: Mounting hole, 32: Back plate, 33: Adjustment hole, 34: Protrusion, 35
: insertion hole, 36: abutment part, 37: screw shaft, 38: screw hole, 39: cover.

Claims (1)

[Scope of claim for utility model registration] (1) A backrest plate and a tube whose lower end is connected to the leg or seat in an upright state, with a locking part formed at a predetermined height on the inside of the back. At the same time, an opening is formed at a predetermined distance above the backrest rod, and a through hole is formed between the locking part and the opening, and a substrate is attached to the locking part inside the backrest rod. The lower end is supported so as to be tiltable back and forth, the upper end is bent to form a claw piece that protrudes outward from the opening, and the middle part is linked with the tip of an operation button inserted into the through hole in an outwardly protruding state. Also, an operating member elastically biased rearward by an elastic body interposed between the front surface of the backrest rod, and a backrest on both sides of the rod body that is slidably fitted onto the upper part of the backrest rod. A chair back plate comprising: a mounting plate for fixing the plate; and a sliding rod having a plurality of adjustment holes vertically spaced apart from each other at predetermined intervals on the back surface to engage the claws of the operating member; Height adjustment device. (2) A protrusion that engages with an engagement hole formed at a predetermined position on the back of the backrest rod is provided inside, and
A slider having a substantially U-shaped cross section with an insertion hole formed at a position corresponding to the opening is fitted into contact with the back and both sides of the backrest rod, and the slider is fitted between the slider and the front of the backrest rod. A chair back plate height adjusting device according to claim 1, which is fitted onto the outside of the chair. (3) A through hole in which a large hole and a small hole are continuous is formed on the back surface of the backrest rod, and a collar portion that can pass through the large hole and that can be locked in the small hole is formed in a neck portion that can be inserted through the small hole. An operation button is integrally formed on the tip side and has a protrusion on the tip that can be inserted into a hole formed in the middle part of the substrate of the operation member, and the operation button is provided protruding around the hole on the front side of the substrate of the operation member. A chair back plate height adjusting device according to claim 1, wherein one end of a compression coil spring is engaged and supported around a protrusion of the operation button protruding from the hole inside a supporting ring. . (4) A circular through-hole is formed on the back surface of the backrest rod, and an operation button is formed by integrally forming a threaded shaft and a protrusion on the neck part which can be loosely inserted into the through-hole by sequentially reducing the diameter toward the tip, Claim for registration of a utility model, wherein the screw shaft of the operation button is screwed into a screw hole formed in the intermediate part of the board of the operation member, and one end of a compression coil spring that can be inserted into the screw hole is engaged with and supported by the protrusion. The device for adjusting the height of a backrest plate of a chair according to item 1.