JP2001128785A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support a back plate for supporting a cushion body of a chair by a support frame so that it can be deflected. SOLUTION: In the chair where a back plate 2 that is made of such a hard, elastic material as a synthetic resin is mounted to the front of a support frame 1 being erected from the rear part of a seat and a cushion body 14 is mounted to the front of the back plate 2, a packing and holding piece 10 with a fitting groove 10a in left and right directions being open upward in an arc shape exceeding a semicircle is allowed to project at one or a plurality of appropriate locations in the up/down directions of the support frame 1 as the mounting means to the support frame 1 of the back plate 2, and an inflation part 12 in a short shaft shape is provided in left/right directions being pressed and fitted to the fitting groove 10a from an upper portion is provided at a position corresponding to the packing and holding piece 10 in the back plate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining chair suitable for operating OA equipment such as a personal computer, and more particularly to a mounting structure of a backrest thereof.

[0002]

2. Description of the Related Art Conventionally, in a reclining type chair of this type, during reclining, a considerable part of the weight is applied to the backrest, and the backrest plate tends to bend and deform with respect to the support frame.

[0003]

In such a case, if the backrest plate is rigidly fixed to the support frame, stress is concentrated on the fixed portion, and this portion is easily damaged.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention supports a backrest plate for supporting a cushion body in a chair flexibly on a support frame and applies an unreasonable load to a mounting portion of the backrest plate to the support frame. The purpose of the present invention is to provide a chair that is not damaged by the addition of a chair.

[0005]

According to the present invention, the above-mentioned problem is solved as follows. (1) A chair in which a backrest plate made of a hard elastic material such as a synthetic resin is attached to a front surface of a support frame erected from a rear portion of a seat, and a cushion body is attached to a front surface of the backrest plate. As a means for attaching the plate to the support frame, a holding piece provided with a left-right fitting groove which opens upward in an arc shape exceeding a semicircle at an appropriate position in one or more vertical positions of the support frame, facing forward. The backrest plate may be provided with a short-axis bulge in the left-right direction which is press-fitted from above into the fitting groove at a position corresponding to the holding piece.

(2) In the above item (1), a fitting hole into which the holding piece of the support frame is fitted from the rear is formed directly below the bulging portion of the backrest plate.

(3) In the above item (1) or (2), the bulging portion of the backrest plate is positioned so as to protrude forward and backward of the backrest plate.

(4) In any one of the above items (1) to (3), the mounting means according to claim 1 is provided on one of the upper and lower portions near the left and right ends of the support frame and the backrest plate. On the other lower or upper part, an engaging protrusion having a locking head at the tip is provided to protrude forward on the support frame, and the backrest plate is located at a position corresponding to the engaging protrusion from the rear. An engagement hole to be fitted and locked is formed.

(5) In the above item (4), the engaging hole of the backrest plate is composed of a large-diameter hole through which the engaging projection of the support frame passes, and a small-diameter long hole continuously connected upward. Shall be.

(6) In any one of the above items (1) to (3), the mounting means according to the above item (1) is provided on upper and lower portions near the left and right ends of the support frame and the backrest plate.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the chair according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a supporting frame of a backrest of a chair according to the present invention.
FIG. 2 is an exploded perspective view showing (1) and the backrest plate (2).
FIG. 3 is an enlarged side view of a mounting portion of the support frame (1) and the backrest plate (2).

As shown in FIGS. 3 and 4, a reclining mechanism is provided on a support (4) rotatably supported on a leg (3).
(5) is attached. A seat (6) is mounted on a reclining mechanism (5) known as a back seat synchro reclining mechanism, and a rear part of the reclining mechanism (5) is bent forward in a side view. A support frame (1) of the backrest is supported.

As is clear from FIG. 4, the support frame (1)
A vertical rod extending from both left and right sides of the reclining mechanism (5)
The upper ends of (7) are connected by a horizontal rod (8). In the upper part of the vertical rod (7), that is, the connecting part with the horizontal rod (8),
An engaging projection (9) having a locking head (9a) at the tip is projected forward, and the upper part of the lower front surface of the vertical rod (7) is an arc opening beyond a semicircle, opening right and left. A holding piece (10) having a directional fitting groove (10a) protrudes.

As shown in FIGS. 1 and 5, the backrest plate (2) is a molded plate of a hard elastic material such as a hard synthetic resin which is hollowed out into an expanded metal shape except for the peripheral portion. An engaging hole (11) is formed at the upper left and right end portions at positions corresponding to the upper engaging projections (9) of the support frame (1). The engagement hole (11) has a large-diameter hole (11a) through which the engagement protrusion (9) passes, and a small-diameter long hole continuously connected to the large-diameter hole.
(11b)

At the left and right ends of the lower part of the backrest plate (2), fitting grooves are formed at positions corresponding to the holding pieces (10) at the lower part of the support frame (1).
(10a) A short-axis bulge in the left-right direction that is press-fitted from above
(12) is formed. Immediately below the bulge (12), a support frame
A fitting hole (13) into which the holding piece (10) of (1) can be fitted from the rear is formed.

When viewed from the side, the bulging portion (12) is positioned so as to project half back and forth from the backrest plate (2). It is an arc shape exceeding the semicircle of 10) and is substantially equal to or slightly larger than the inner diameter of the fitting groove (10a) in the left-right direction that opens upward. The bulging portion (12) may be projected forward or backward of the backrest plate (2) in some cases.

In order to attach the backrest plate (2) to the support frame (1), first, the engaging projections (9) on the right and left ends of the upper part of the support frame (1).
From the front into the large-diameter hole (11a) of the engaging hole (11) at the left and right end of the upper part of the backrest plate (2). Insert the fitting holes (13) at the lower left and right end
Hook the holding piece (10) of (1). This state is shown enlarged in FIG.

Next, when the backrest plate (2) is depressed, the engaging projections (9) of the support frame (1) at the upper portion cause the small-diameter elongated holes (11b) of the engaging holes (11) of the backrest plate (2). ), And the locking head (9a) remains in front of the small-diameter long hole (11b), so that the upper portion of the backrest plate (2) is securely locked to the support frame (1) at both left and right ends. .

At this time, in the lower part, the support frame of the backrest plate (2)
The short-sided bulging portion (12) of (1) is formed in the holding piece (10) in an arc shape exceeding a semicircle and opening upward in a left-right direction fitting groove (10a).
Is pressed from above. In this state, the holding piece (10)
The backrest plate (2) is locked in the fitting hole (13) in the left-right direction.
Cannot move in the left-right direction, but the short-axis-shaped bulged portion (12) is slightly rotatably supported by the arc-shaped fitting groove (10a). This final state is shown in FIGS.

Further, as another embodiment, contrary to the above-described embodiment, a holding piece provided with a fitting groove is projected from an upper portion near the left and right ends of the support frame, and an engagement protrusion is provided at a lower portion. The backrest plate may be provided with a short-axis bulge at a position corresponding to the holding piece and an engagement hole at a position corresponding to the engagement protrusion.

In still another embodiment, holding pieces provided with fitting grooves are protruded from upper and lower portions near the left and right ends of the support frame, and are provided on the backrest plate at positions corresponding to the holding pieces. Alternatively, a short-axis bulge may be provided.

[0024]

According to the first aspect of the present invention, the backrest plate can be easily and easily attached to the support frame, and can be easily removed. Furthermore, even if the backrest plate is pushed by the back of the seated person and the upper part is flexed or deformed, or a considerable part of the weight is added during reclining, the entire body is flexed and deformed, so that it fits into the holding piece. Rotation of the bulging portion effectively prevents the backrest plate, particularly the mounting portion thereof, from being broken by an excessive load.

According to the second aspect of the present invention, the backrest plate can be supported by its thick portion or can be supported in the cushion body in front of the plate, thereby substantially reducing the thickness of the backrest. In addition to this, it is possible to prevent the backrest plate from moving in the left-right direction unnecessarily.

According to the third aspect of the present invention, the bulging portion is firmly integrated with the backrest plate, and has a structure that is not easily broken.

According to the fourth aspect of the present invention, the backrest plate is immovably mounted in the left-right direction, and the backrest plate is pushed by the back of the occupant, and the upper portion thereof is flexibly deformed.
Even if a considerable part of the weight is added during reclining and the entire body is bent and deformed, the bulging portion fitted to the holding piece is rotated, and the engaging projection is vertically moved within the small-diameter elongated hole. By moving the backrest plate, it is possible to more effectively prevent the backrest plate, particularly the attachment portion thereof, from being broken by an excessive load.

According to the fifth aspect of the present invention, with a simple structure, not only secure locking can be performed, but also slight vertical movement accompanying bending deformation of the backrest plate can be allowed.

According to the sixth aspect of the present invention, the backrest plate is attached to the upper and lower portions near the left and right ends of the support frame,
And since the bulging portion fitted to the holding piece is rotatable, even if the backrest plate is entirely bent and deformed, the position of the backrest plate in the vertical direction is stable, Excessive torsional load on the mounting part is prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a part of a support frame of a backrest and a backrest plate of a chair according to an embodiment of the present invention.

FIG. 2 is a partially enlarged side view showing a connection portion between a support frame and a backrest plate in an enlarged manner.

FIG. 3 is a side view of the chair before the backrest plate is attached.

FIG. 4 is a front view of the chair shown in FIG. 3;

FIG. 5 is a front view of the chair with a backrest plate attached.

6 is a side view of the chair shown in FIG. 5, showing the cushion body by imaginary lines.

[Explanation of symbols]

 (1) Support frame (2) Backrest plate (3) Leg (4) Support base (5) Reclining mechanism (6) Seat (7) Vertical rod (8) Horizontal rod (9) Engagement protrusion (9a) (10) Enclosure (10a) Fitting groove (11) Engagement hole (11a) Large diameter hole (11b) Small diameter long hole (12) Swelling part (13) Fitting hole (14) Cushion body

Claims (6)

[Claims] 1. A chair in which a backrest plate made of a hard elastic material such as synthetic resin is attached to a front surface of a support frame erected from a rear portion of a seat, and a cushion body is attached to a front surface of the backrest plate. As a means for attaching the backrest plate to the support frame, a holding piece provided with a left-right fitting groove which opens upward in an arc shape exceeding a semicircle at one or more appropriate positions in the vertical direction of the support frame. The backrest plate is provided with a short-axis bulge portion in the left-right direction which is pressed into the fitting groove from above at a position corresponding to the holding piece. Chair featuring. 2. The chair according to claim 1, wherein a fitting hole into which the holding piece of the support frame is fitted from the rear is formed directly below the bulging portion of the backrest plate. 3. The chair according to claim 1, wherein the swelling portion of the backrest plate is positioned so as to protrude forward and backward of the backrest plate. 4. The mounting means according to claim 1, provided at one of the upper and lower portions near the left and right ends of the support frame and the backrest plate, and at the other lower or upper portion,
An engaging projection having a locking head at the tip is projected forward, and an engaging hole is formed in the backrest plate at a position corresponding to the engaging projection so that the engaging hole can be fitted and locked from behind. The chair according to any one of claims 1 to 3, wherein the chair is provided. 5. The backrest plate according to claim 4, wherein the engagement hole of the backrest plate comprises a large-diameter hole through which the engagement projection of the support frame passes, and a small-diameter long hole continuously connected to the large-diameter hole. Chair. 6. The chair according to claim 1, wherein the mounting means according to claim 1 is provided at upper and lower portions near the left and right ends of the support frame and the backrest plate.