JP2002136385A - Seat mounting device in chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a seat plate of a swivel chair to a seat plate mounting metal fitting on a supporting base through a simple structure by a simple operation. SOLUTION: A mounting hole 16 constructed of a large-diameter hole 16a and a long hole 16b continuously arranged from the large-diameter hole 16a in the forward/backward direction and formed to be narrower than the large- diameter hole 16a is bored longitudinally on each of the left and right sides of the seat plate mounting metal fitting 7 arranged on the supporting base 2 of the chair. On the lower face of the seat plate 18, a mounting shaft 19 provided with a width not less than that of the long hole 16b and directed downward is protruded in the opposite position to the large-diameter 16a. When the seat plate 18 is moved forward/backward to the seat mounting metal fitting 7 so that the mounting shaft 19 is positioned inside the long hole 16b after a flange 19 smaller than the large-diameter hole 16a in diameter and wider than the long hole 16b is passed through the large-diameter hole 16a, the seat plate 18 is installed to the seat plate mounting metal fitting 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat mounting device for a chair.

[0002]

2. Description of the Related Art There is a conventional swivel chair in which a backrest swings rearward and a seat tilts and moves back and forth due to a load of a sitting person leaning on the backrest. Such a mechanism has the advantage of improving the sitting comfort of the occupant and eliminating the feeling of fatigue.

[0003]

OA of recent personal computers etc.
With the widespread use of devices, in the swivel chair, not only the tilt mechanism of the seat as described above, but also the back and forth positions of the seat with respect to the armrests are delicately adjusted to allow the backrest of the occupant when using the keyboard of the desktop PC. In addition, there has been a demand for maintaining a relational position with respect to the armrest optimally. In order to meet this requirement, attaching the seat plate of the seat to the seat plate mounting bracket on the support base requires a rather complicated mechanism.

The present invention has been made in view of the above-mentioned problems, and has a simple structure and a simple operation to remove a seat of a swivel chair.
It is intended to be attached to a seat plate mounting bracket on a support base.

[0005]

According to the present invention, the above-mentioned problem is solved as follows. (1) A large-diameter hole and a narrower hole than the large-diameter hole connected continuously from either the front or rear direction from the left and right sides of the seat plate mounting bracket provided on the base of the chair. A mounting hole consisting of a long hole is bored, and a mounting shaft projecting downward at the same width as or narrower than the width of the long hole is provided at a position facing the large-diameter hole on the lower surface of the seat plate, At the lower end of the mounting shaft, a flange smaller in diameter than the large-diameter hole and wider than the width of the long hole is inserted from the large-diameter hole so that the mounting shaft is located in the long hole. The seat plate is attached to the seat plate attachment by moving the seat plate back and forth with respect to the seat attachment.

(2) In the above item (1), a long hole of the mounting hole of the seat plate mounting bracket is continuously provided behind the large diameter hole, and a mounting shaft of the seat plate is connected to the mounting hole of the seat plate mounting bracket. A stopper is attached to the rear portion of the seat plate in a state where the mounting shaft is moved to the position, and the stopper engages with a rear end of the seat plate mounting bracket, so that the mounting shaft does not return to the large-diameter hole of the mounting hole. To do.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view of a swivel chair equipped with casters provided with an embodiment of the present invention. A support base (2) is rotatably mounted on the upper end of a leg (1) equipped with casters. A horizontal shaft (3), which is mounted and extends in the left-right direction at the rear of the support base (2), supports the left and right sides of the backrest (4) and extends forward from the lower end of the backrest (4). A shaft cylinder (6), which is formed at the tip of the rod (5) and faces in the left-right direction, is mounted on the shaft.

The left and right bearings (8) at the rear of the seat plate mounting bracket (7)
An ear piece (9) provided at an intermediate position of a back rod (5) of a backrest (4) is rotatably accommodated, and an armrest support ( 10) The lower end is attached. At the front end of the seat plate mounting bracket (7), a lug (11) projecting downward is provided, and the lug (11) is formed by an elongated hole (12) provided at the front of the support base (2). ) Is attached by a pin.

As shown in FIGS. 1-3, a seat plate mounting bracket
(7) is formed by firmly welding a rail (14) having a U-shaped cross section extending in the front-rear direction to the left and right ends of a lateral rod (13) extending in the left-right direction at the rear.

The horizontal rod (13) is formed by bending a steel plate into a U-shape in cross section and bending both ends of the steel plate horizontally outward to form a flange. The rail (14) is fitted and welded.

Similarly, the rail (14) is formed by bending a steel plate in an upward U-shaped cross section, and has an inner end bent horizontally to form a flange (14a). Near the front end, there are a number of recessed grooves (15) (six steps in the figure)
They are arranged in the front-back direction. The concave groove (15) forms an engaged portion that fits into a projection of a seat plate described later.

At the bottom of each of the front and rear portions of the rail (14), there is provided a large-diameter hole (16a) followed by a small-diameter long hole (16b) extending rearward. A hole (16) is drilled. The ear piece (11) is provided inside the front part of the rail (14).

As shown in FIG. 4, the rear surface of the seat plate (18) below the seat (17) shown in FIG. Long ridge
(20) is provided.

As shown in FIGS. 4 and 5, a flanged mounting shaft (19) protruding from the mounting hole (16) formed in the rail (14) of the seat plate mounting bracket (7). However, it protrudes downward. The diameter of the flange (19a) of this mounting shaft (19) is
The diameter is slightly smaller than the large diameter hole (16a). The diameter of the mounting shaft (19) is equal to or slightly smaller than the width of the long hole (16b). FIG. 4 shows a seat plate mounting bracket.
The position of the mounting hole (16) in (7) is also shown.

In the vicinity of the front portion of the back surface of the seat plate (18), two engaging portions forming left and right positions corresponding to the concave groove (15) of the rail (14) of the seat plate mounting bracket (7) are formed. A projection member (21) having a projection (21a) is attached.

Further, as shown in FIG. 4 and FIG.
A stopper (22) is attached to the rear part of the (18) in the left-right direction corresponding to the rail (14) of the seat plate mounting bracket (7).

A ridge (20) projecting from the lower surface of the seat plate (18) is
The rail (14) is inserted so as to be in contact with the inside of the rising portion on the outside, and the flange (19a) of the mounting shaft (19) is inserted into the large-diameter hole (16) of the mounting hole (16) of the seat plate mounting bracket (7). Insert through 16a) from above. When the seat plate (18) is slightly lifted upward and pulled backward while being adjusted in this state, the ridges (20) of the seat plate (18) are guided by the rails (14), and the seat plate (18) is guided. ) Moves backward, and the mounting shaft (19) fits into the long hole (16b) of the mounting hole (16). When you release your hand, the projection (21a) of the seat plate (18) will
Fit into 5).

In this state, if the stopper (22) is fixed to the rear part of the seat plate (18), even if the seat plate (18) is moved forward in the same manner, the stopper (22) is fixed to the rail (14). The mounting shaft (19) does not reach the large-diameter hole (16a) of the mounting hole (16) by contacting the rear end, so that the seat plate (18) does not come off from the seat plate mounting bracket (7).

In adjusting the front / rear position of the seat (17), as shown in FIG. 6, the front end of the seat plate (18) is slightly lifted up as indicated by a dotted arrow, and the projection (21a) on the lower surface of the seat plate (18) is raised. ),
Separate from the groove (15) of the rail (14) of the seat plate mounting bracket (7). The mounting shaft (19) is long enough to allow this.

In this state, the seat plate (18) is moved to the desired position by moving the seat plate (18) in the front-rear direction as indicated by the dotted arrow at the top of FIG. ) Engages with the new groove (15) and is locked at that position.

[0021]

According to the first aspect of the present invention, the seat plate can be easily attached to the seat plate mounting bracket with a simple mechanism and simple operation.

According to the second aspect of the present invention, the seat plate does not come off from the seat plate mounting bracket unless the stopper is removed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a swivel chair provided with an embodiment of the device of the present invention.

FIG. 2 is a perspective view of a seat plate fitting of the chair shown in FIG. 1;

FIG. 3 is a plan view of a seat plate mounting member.

FIG. 4 is a rear view of the seat plate.

FIG. 5 is a side view showing the seat plate mounting bracket and the seat plate in a separated state.

FIG. 6 is a side view showing the seat plate mounting bracket and the seat plate in a connected state.

[Explanation of symbols]

 (1) Leg (2) Support (3) Horizontal axis (4) Backrest (5) Back rod (6) Shaft tube (7) Seat plate mounting bracket (8) Bearing (9) Ear piece (10) Armrest Prop (11) Ear piece (12) Long hole (13) Horizontal rod (14) Rail (14a) Flange (15) Groove (engaged part) (16) Mounting hole (16a) Large diameter hole (16b) Long Hole (17) Seat (18) Seat plate (19) Mounting shaft (19a) Flange (20) Projection (21) Projection member (21a) Projection (engagement part) (22) Stopper

Claims (2)

[Claims] 1. A large-diameter hole and a large-diameter hole provided in front and rear on both left and right sides of a seat plate mounting bracket disposed on a support base of a chair. A mounting hole consisting of a narrow elongated hole is drilled, and a mounting shaft projecting downward at the same width as or narrower than the width of the long hole is provided at a position on the lower surface of the seat plate facing the large diameter hole. The mounting shaft is located in the long hole from a state in which a flange provided at the lower end of the mounting shaft and having a smaller diameter than the large-diameter hole and wider than the width of the long hole is inserted through the large-diameter hole. As described above, the seat mounting device for a chair, wherein the seat plate is mounted on the seat plate mounting bracket by moving the seat plate back and forth with respect to the seat mounting bracket. 2. A state in which a long hole of a mounting hole of a seat plate mounting bracket is continuously provided behind a large-diameter hole, and a mounting shaft of a seat plate is inserted and moved through the mounting hole of the seat plate mounting bracket. 2. A stopper is attached to a rear portion of the seat plate, and the stopper is engaged with a rear end of the seat plate mounting member so that the mounting shaft does not return to the large-diameter hole of the mounting hole. Mounting device for the chair in the chair.