JPS5934364Y2 - Chair back angle and height adjustment device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that allows the angle and height of the backrest of a chair to be adjusted with a simple structure.

In general chairs such as office chairs, the backrest maintains an upright posture with spring pressure, and when the user leans against the backrest, the backrest elastically leans back according to the user's weight. many.

However, depending on the purpose, it may be desirable to use the backrest fixedly at any angle and height depending on the user's body shape and preference.

For this reason, various backrest angle and height adjustment devices have been proposed in the past, but when attempting to provide both the functions of adjusting the angle and height of the backrest, the two adjustment directions are different, resulting in structural complexity. There was a problem.

This invention was made in view of the above points, and the purpose is to realize the function of adjusting both the angle and height of the backrest with a simple structure.

This invention will be explained below based on illustrated embodiments.

In Fig. 1, reference numeral 1 denotes a pillar, which has a plurality of leg seats 2 extending radially at its lower end, and has a cylindrical seat bracket 3 with a square cross section fixed to its upper end by suitable fixing means. A seat plate 4 is placed and fixed on the receiving metal fitting 3.

21 is a seat plate with an inverted chevron shape on the front. A backrest support 5 made of an oblong pipe is inserted through the rear part of the floor support 3 that protrudes from the rear end of the seat plate 4, and the height and height are adjusted by a backrest support fixing metal fitting (described later) installed in the floor support 3. It is held upright with its angle adjustable.

Reference numeral 6 denotes a back support plate fixed to the upper end of the support column 5 with a mounting shaft 7.

A pair of elongated holes 8,
9 are bored facing each other with their positions slightly shifted from each other in the longitudinal direction, and the backrest support 5 is loosely inserted into the floor support fitting 3 through these elongated holes 8 and 9. It is something.

Reference numeral 10 denotes the above-mentioned backrest support fixing fitting, and the backrest support support gripping part 11 is approximately U-shaped or C-shaped with the minus side open.
and outwardly bent edges 12 and 13 connected to both ends thereof, forming a substantially cap-shaped longitudinal section.

A protrusion 14 extending in the longitudinal direction is formed on the inner circumferential surface of the gripping portion 11.
A large number of protrusions are provided at equal intervals, and the bent edge 12.1
3 has one 12 thereof slightly curved in the opposite direction to the grip portion 11.

This backrest support metal fitting 10 has a grip portion 11 vertically slidably fitted to the backrest support 5 in the seat pipe metal fitting 3, and one bent edge 12 attached to one side wall 3C of the seat support metal fitting 3 with a pivot pin. 15 and the other bent edge 13
is screwed into an angle fixing tightening bolt 17 inserted into the seat pipe fitting 3 through an arcuate elongated hole 16 centered on a pivot pin 15 drilled in the same side wall 3C. In this position, the seat support bracket 3 is forcibly fastened and fixed to one side wall 3C using the bent edge 13 and elasticity.
It is press-fixed by the top wall of 1 to one side edge of the upper and lower elongated holes 8 and 9 facing each other, and is held upright at a predetermined angle and height.

18 is an operation handle attached to the rear end of the tightening bolt 17 on the outside of the seat pipe fitting 3; 19 is a washer; and 20 is a cap fitted at the rear end of the seat pipe fitting 3.

In the above embodiment, when it becomes necessary to adjust the height and angle of the backrest, loosen the tightening bolt 17 using the operating handle 18 and release the pressing force of the top wall of the grip part 11 against the backrest support 5, and the backrest support 5 will slide up and down. It becomes movable and the fixing metal fitting 10 becomes freely rotatable about the pivot pin 15 within the range allowed by the arc-shaped elongated hole 16.

Therefore, by grasping the backrest support 5 by hand and pulling it upward or pulling it down, the backrest support 5 can be slid upward or downward along the protrusion 14 of the grip part 11 to reach a desired height. , backrest support 5
When the seat is tilted forward or backward to a desired posture and the tightening bolt 17 is tightened again, the backrest support 5 is fixed at the height and angle by the fixing fitting 10.

This invention is based on the above-mentioned, and the angle of the backrest is adjusted by gripping the backrest support 5 and rotating the fixing bracket 10 with the pivot pin 15 as a fulcrum. The height of the backrest is adjusted by sliding the support 5 in the direction of insertion and removal with respect to the fixture 10,
Further, the rotation of the fixing bracket 10 and the sliding of the support column 5 relative to the fixing bracket 10 are fixed at once by tightening the tightening bolt 17, so that the adjustment angle and height of the backrest can be maintained. Both the functions of adjusting the angle and height of the backrest are provided by using a common base, the fixing metal fitting 10, and furthermore, the adjustment angle and the height can be held at the same time by the fixing means of the fixing metal fitting 10. Therefore, the structure is extremely simple and there are many problems in terms of manufacturing and cost, and the adjustment operation is extremely simple, which is convenient in practice.

Furthermore, in this invention, the seat pipe metal fitting 3 is made into a cylindrical shape with a square cross section, and the column fixing metal fitting 10 is completely housed inside the seat pipe metal fitting 3.

Therefore, the above-mentioned pillar fixing structure is not visible at all from the outside,
It looks very good and poses little danger to humans.

Moreover, the above-mentioned column fixing metal fitting 10 is pivotally attached to the seat pipe fitting 3 at a bent edge 12 at one end in the longitudinal direction, and is tightened to the seat pipe fitting 3 with a tightening bolt 17 at a bending line 13 at the other end.
Since it is made to be able to be loosened and to press and hold the backrest support 5 at a position between them, when the tightening bolt 17 is tightened, the fixing metal fitting 10 swings around one pivot point. It is pulled toward the seat pipe metal side, and the backrest support 5 can be gripped very firmly by a kind of lever principle, and there is no risk of the backrest support 5 accidentally falling even if the bolt is tightened with a slight force.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention: Fig. 1 is a side view of the entire chair, Fig. 2 is an enlarged vertical cross-sectional view of the main part, Fig. 3 is a perspective view of the main part, and Fig. 4 is a side view of the entire chair. FIG. 2 is a sectional view taken along line IVIV. 3... Seat pipe fittings, 3 a, 3 b...
・Upper and lower walls, 4... Seat plate, 5... Backrest support, 8, 9... Upper and lower elongated holes, 10...
・Fixing bracket, 11...Gripping part, 12.13...
...Outward bending edge, 15 ... Pivotal pin, 16
......Circular long hole, 17...Tightening bolt.

Claims (1)

[Scope of utility model registration request] A pair of elongated holes 8, 9 which are long in the front and rear direction are bored in the upper and lower rear walls 3a, 3b of the cylindrical seat bracket 3, which has a rectangular cross section and is provided on the lower surface of the seat plate 4 so as to project rearward. The backrest support 5 is inserted into the floor support bracket 3 through the elongated holes 8 and 9 so as to be able to slide up and down and tilt forward and backward. The grip part 11 of the backrest support fixing metal fitting 10 having continuous outward bent edges 12 and 13 is fitted to the backrest support 5 so as to be vertically slidable, and the one bent edge 12 is connected to the floor support metal fitting 3. The floor bracket 3 is pivotally connected to one side wall 3C by a pivot pin 15, and the other bent edge 13 is inserted through an arcuate elongated hole 16 centered on the pivot pin 15 bored in the same side wall 3C.
It is attached to the floor bracket 3 by being screwed into the angle fixing tightening bolt 17 with the operating handle 18 inserted therein, and the other bent edge 13 is fixed to the floor bracket 3 by the tightening bolt 17.
By being forcibly fastened to one side wall 3C, the backrest support 5 is secured to the floor support bracket 3 by the top wall of the grip portion 11.
A chair backrest angle and height adjustment device which is press-fixed to the side edges of the upper and lower elongated holes 8 and 9 of the chair.