JP4316748B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reclining chair suitable for operation of OA equipment such as a personal computer, and more particularly to a mounting structure for the backrest thereof.
[0002]
[Prior art]
Conventionally, in this type of reclining chair, a considerable portion of body weight is applied to the backrest during reclining, and the backrest plate tends to bend and deform with respect to the support frame.
[0003]
[Problems to be solved by the invention]
In such a case, if the backrest plate is rigidly fixed to the support frame, stress concentrates on the fixed portion, and this portion is easily damaged.
[0004]
In view of the above-mentioned problems, the present invention supports a backrest plate that supports a cushion body in a chair on a support frame so that it can be bent, and an unreasonable load is applied to the attachment portion of the backrest plate to the support frame. The aim is to provide a chair that is not destroyed.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) In a chair in which a backrest plate made of a hard elastic material such as a synthetic resin is attached to the front surface of a support frame standing from the rear of the seat, and a cushion body is attached to the front surface of the backrest plate. As a means for attaching the plate to the support frame, a left-right fitting groove that opens upward in a circular shape exceeding a semicircle is provided in either the upper or lower portion near the left and right ends of the support frame and the backrest plate. The backrest plate is provided with a short-axis bulging portion in the left-right direction that is press-fitted from above into the fitting groove at a position corresponding to the holding piece. A fitting hole into which the holding piece of the support frame is fitted from behind is formed directly below the bulging portion, and a locking head is provided on the support frame at the other lower or upper portion. An engagement protrusion at the tip protrudes forward, and the backrest plate has a position corresponding to the engagement protrusion. The backrest plate is attached to the support frame by drilling an engagement hole that is fitted and locked from the rear and allowing the bulging portion press-fitted in the fitting groove to be rotated. Install so that it can be bent.
[0006]
(2) In the above item (1), the bulging portion of the backrest plate is positioned so as to protrude forward and backward of the backrest plate.
[0007]
(3) In the above item (1) , the engagement hole of the backrest plate is composed of a large-diameter hole through which the engagement projection of the support frame is passed and a small-diameter long hole continuously provided upward. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
[0009]
An embodiment of a chair of the present invention will be described with reference to the accompanying drawings.
[0010]
FIG. 1 is a perspective view showing a support frame (1) and a back plate (2) for the chair back of the present invention in an exploded state, and FIG. 2 shows a support frame (1) and a back plate (2). It is an enlarged side view of the attachment part.
[0011]
As shown in FIGS. 3 and 4, a reclining mechanism (5) is attached to a support base (4) rotatably supported on a leg (3). A seat part (6) is mounted on a reclining mechanism (5) known as a back seat synchro reclining mechanism, and the rear part of the reclining mechanism (5) is bent in a letter-like shape in front view. The back support frame (1) is supported.
[0012]
As is clear from FIG. 4, the support frame (1) is configured by connecting the upper ends of the vertical rods (7) extending from the left and right sides of the reclining mechanism (5) with the horizontal rods (8).
An engaging projection (9) having a locking head (9a) at the tip is projected forward from the upper portion of the vertical rod (7), that is, the connecting portion with the horizontal rod (8), and the vertical rod (7 On the lower front surface of), a holding piece (10) having an arc shape exceeding a semicircle and having a left and right fitting groove (10a) opening upward is projected.
[0013]
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 that is hollowed out in an expanded metal shape except for the peripheral portion. In the left and right ends of the frame, there is an engagement hole (11) into which the engagement protrusion (9) is fitted and locked at a position corresponding to the engagement protrusion (9) on the upper portion of the support frame (1). It is installed. The engagement hole (11) is a dharma hole composed of a large-diameter hole (11a) through which the engagement protrusion (9) is passed, and a small-diameter long hole (11b) provided continuously therebelow. 0014
The left and right ends of the backrest plate (2) are press-fitted from above into the fitting groove (10a) at positions corresponding to the holding pieces (10) at the bottom of the support frame (1). A short-axis bulging portion (12) in the direction is formed. Immediately below the bulging portion (12), a fitting hole (13) is formed in which the holding piece (10) of the support frame (1) can be fitted from behind.
[0015]
The bulging portion (12) is positioned so as to protrude half by one in the front and rear direction of the backrest plate (2) when viewed from the side, and the short axis diameter of the bulging portion (12) is It has an arc shape exceeding a semicircle 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.
In some cases, the bulging portion (12) may protrude forward or backward of the backrest plate (2).
[0016]
In order to attach the backrest plate (2) to the support frame (1), first, the locking head (9a) of the engagement protrusions (9) at the left and right ends of the upper portion of the support frame (1) is mounted on the backrest plate. It is inserted from the front into the large-diameter hole (11a) of the engagement hole (11) at the upper left and right ends of (2) and the fitting holes (at the lower left and right ends of the backrest plate (2) ( 13) is hooked on the holding piece (10) of the support frame (1). This state is shown enlarged in FIG.
[0017]
Next, when the back plate (2) is pushed down, the upper portion of the engagement projection (9) of the support frame (1) falls into the small diameter long hole (11b) of the engagement hole (11) of the back plate (2). Since the locking head (9a) remains in front of the small diameter long hole (11b), the upper part of the backrest plate (2) is securely locked to the support frame (1) at both left and right ends.
[0018]
At this time, in the lower part, the short-axis bulge part (12) of the support frame (1) of the backrest plate (2) opens upward in an arc shape exceeding the semicircle of the holding piece (10). A fitting groove (10a) in the left-right direction is press-fitted from above. In this state, since the holding piece (10) is locked in the left and right direction in the fitting hole (13), the backrest plate (2) cannot move in the left and right direction. The bulging portion (12) is supported so as to be slightly rotatable by the arcuate fitting groove (10a). This final state is shown in FIGS.
[0019]
Further, as another embodiment, contrary to the above-described embodiment, a holding piece provided with a fitting groove is provided on the upper part in the vicinity of the left and right ends of the support frame, and an engagement protrusion is provided on the lower part. 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.
[0020]
【The invention's effect】
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, when the backrest plate is pushed against the seated person's back, the upper part is bent and deformed, or a considerable part of the weight is added during reclining, so even if it is bent and deformed as a whole, it fits into the carrying piece By rotating the bulged portion thus formed, it is effectively prevented that an excessive load is applied to the backrest plate, particularly its mounting portion, and it is broken.
In addition, the backrest plate can be supported by the plate thickness part or in the cushion body in front of the plate, the thickness of the backrest can be substantially reduced, and the backrest plate can It is possible to prevent movement in the left-right direction.
Furthermore, even if the backrest plate is attached so as not to be movable in the left-right direction, and the backrest plate is pushed against the seated person's back and its upper part is bent and deformed, the bulge fitted to the holding piece By rotating the portion, it is possible to effectively prevent the backrest plate, in particular, the mounting portion from being damaged by applying an excessive load.
[0021]
According to the second aspect of the present invention, the bulging portion is firmly integrated with the backrest plate, so that the structure is difficult to break.
[0022]
According to the third aspect of the present invention , not only can the positive locking be achieved with a simple configuration, but also the engagement protrusions are slightly formed in the small-diameter long hole of the engagement hole due to the bending deformation of the backrest plate. Even if the backrest plate is bent and deformed as a whole due to the addition of a substantial part of the body weight when reclining, there is an unreasonable load on the backrest plate, especially its mounting part. It is possible to more effectively prevent the destruction due to the addition.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a part of a support frame for a backrest of a chair and a backrest plate according to an embodiment of the present invention.
FIG. 2 is a partially enlarged side view showing an enlarged connection portion between a support frame and a backrest plate.
FIG. 3 is also a side view of the chair before a backrest plate is attached.
4 is a front view of the chair shown in FIG. 3. FIG.
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 and shows the cushion body with an imaginary line. FIG.
[Explanation of symbols]
(1) Support frame
(2) Backrest board
(3) Leg
(4) Support base
(5) Reclining mechanism
(6) Seat
(7) Downspout
(8) Yokohama
(9) Engagement protrusion
(9a) Locking head
(10) carrying piece
(10a) Mating groove
(11) Engagement hole
(11a) Large diameter hole
(11b) Small diameter long hole
(12) bulge
(13) Mating hole
(14) Cushion body

Claims (3)

In a chair in which a backrest plate made of a hard elastic material such as a synthetic resin is attached to the front surface of a support frame standing from the rear of the seat, and a cushion body is attached to the front surface of the backrest plate, the backrest plate is supported. As a means for attaching to the frame, a holding having a fitting groove in the left-right direction that opens upward in an arc shape exceeding a semicircle in either the upper part or the lower part in the vicinity of the left and right ends of the support frame and the backrest plate piece prospectively projected and wherein the backrest plate, in a position corresponding to the embracing pieces, provided bulges of the short-shaft in the horizontal direction to be press fit from above into the fitting groove, the A fitting hole into which the holding piece of the support frame is fitted from the rear is drilled immediately below the bulging portion, and the support frame is provided at the tip of the other lower or upper portion of the support frame. Engagement protrusions project forward and the backrest plate has a position corresponding to the engagement protrusions. The backrest plate is attached to the support frame by forming an engagement hole that is fitted and locked from the rear and allowing the bulging portion that is press-fitted into the fitting groove to rotate. A chair characterized in that it can be flexibly deformed .   The chair according to claim 1, wherein the bulging portion of the backrest plate is positioned so as to protrude forward and backward of the backrest plate. The chair according to claim 1, wherein the engagement hole of the backrest plate is composed of a large-diameter hole through which the engagement protrusion of the support frame passes and a small-diameter long hole continuously provided upward.

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