JP4888956B2 - Chair - Google Patents

Description

  The present invention relates to a chair in which a backrest plate made of synthetic resin or the like is attached to the front surface of a backrest support frame that stands up from the rear portion of a seat body so as to be elastically bent.

The applicant of the present application has devised a chair on the front surface of the back support frame, on which a back plate made of synthetic resin that can be attached with a cushion body on the front surface is elastically bent and can be easily attached and detached. Have previously filed patent applications (see, for example, Patent Document 1).
JP 2001-128785 A

  In the chair described in the above-mentioned patent document, the shaft-like bulging portions provided on the upper and lower left and right sides of the backrest plate are located above the holding piece protruding from the front surface of the backrest support frame (support frame). It fits in the fitting groove that opens in the upper direction, or either one of the upper and lower bulges is a hole-like engagement hole that faces in the vertical direction. The backrest plate is attached to the front surface of the backrest support frame so as to bendable by engaging the locking heads of the engaging projections protruding from the backrest support frame so as to be slidable up and down.

  Therefore, the backrest plate can be attached to and removed from the backrest support frame very easily, and the load when the backrest plate is elastically deformed rearward is not excessively applied to the mounting portion. Have.

  On the other hand, if a strong upward force is applied to the backrest plate or the cushion body on the front surface when the chair is transported, the backrest plate may come off the backrest support frame.

  In addition, in the mounting structure in which the engagement hole of the backrest plate is simply engaged with the engagement protrusion of the backrest support frame, the mounting strength of the backrest plate is small and there is a risk of rattling in the front-rear direction.

  Further, when the backrest plate is elastically bent rearward, the rear surface of the backrest plate in the portion through which the engaging protrusion is inserted comes into surface contact with the front surface of the backrest support frame, and slides up and down in this state. Therefore, the frictional resistance increases, and the backrest plate may be difficult to bend back and forth.

  The present invention has been made in view of the above-described problems. The backrest plate can be stably supported by preventing a large load from being applied to the mounting portion of the backrest support frame, and the backrest plate. An object of the present invention is to provide a chair in which a bent plate can be easily elastically bent.

According to the present invention, the above problem is solved as follows.
(1) In a chair in which upper and lower portions of a backrest plate that are elastically bent at least in the middle portion are attached to the front surface of a backrest support frame that stands up from the rear portion of the seat body, the upper and lower sides of the backrest plate Either one of the portions and the backrest support frame facing it is provided with a plate-like mounting portion provided with a long hole facing in the vertical direction, and the other is a convex curved surface shape facing the mounting portion. A convex surface provided on a surface of the pressing tool that faces the receiving surface. The pressing tool is provided at the tip of the bolt projecting from the receiving surface so as to penetrate the elongated hole. The mounting portion is supported by being sandwiched from the front and rear sides so that the mounting portion can be slid in the vertical direction and can be slightly tilted in the front-rear direction.

(2) In the above item (1), an elastic member is inserted between the head provided at the tip of the bolt and the pressing tool fitted to the shaft of the bolt.

(3) In the above item (1) or (2), a part of the backrest plate is bulged rearward to form a vertically long case-shaped mounting portion whose front surface is open, and the pressing portion is pressed into the mounting portion. Houses the tool and the tip of the bolt.

(4) In the above item (3), the lower end of the attachment portion and the lower end of the long hole are opened downward so that the pressing tool and the bolt can be inserted and removed in the vertical direction.

(5) In any one of the above items (1) to (4), a receiving member made of a synthetic resin and having a receiving surface on the front surface is formed forwardly on the front surface of the back support frame facing the pressing tool. Removably attach.

(6) In any one of the above items (1) to (5), a back shaft that protrudes in the left-right direction is provided on the rear surface of either the upper or lower side of the back plate, and the back support is opposed to the support shaft. A support member having a support groove opening upward is provided on the front surface of the frame so as to rotatably support the support shaft.

(7) In any one of the above items (1) to (6), the backrest support frame is formed by combining upper ends of a pair of left and right side frames with an upper frame facing in the left-right direction, The front side of the side frame supports both sides of the backrest plate.

  According to the first aspect of the present invention, the mounting portion provided on any one of the upper and lower sides of the backrest plate and the backrest support frame facing the backrest plate is provided on the other receiving surface facing the mounting portion. Since the back plate is supported by being sandwiched by the pressing tool at the tip of the bolt projecting on the receiving surface, the backrest plate is not rattled or detached from the backrest support frame in the front-rear direction. Can be installed stably.

  Further, the receiving surface and the pressing surface of the pressing tool have a convex curved surface, and the contact area with the backrest plate or the mounting portion of the backrest support frame is small and the frictional resistance is also small. The support portion can easily slide up and down and can be easily elastically bent back and forth, thereby improving sitting comfort and preventing a large load from being applied to the mounting portion.

  According to the second aspect of the present invention, since the pressing tool elastically deforms the elastic member and easily tilts forward and backward, the backrest plate is also more easily bent forward and backward, and more load is applied to the mounting portion. Get smaller.

According to invention of Claim 3, since the front-end | tip part of a pressing tool and a volt | bolt is accommodated in a case-shaped attachment part and does not protrude ahead from the front surface of a backrest board, the cushion body to the front surface of a backrest board is carried out. The mounting becomes easy, and even a cushion body with a small thickness improves the sitting comfort.
Further, since a gap corresponding to the protruding dimension of the mounting portion is formed between the rear surface of the backrest plate and the front surface of the backrest support frame, the backrest plate can be largely bent rearward.

  According to the invention of claim 4, the mounting portion of the backrest plate can be easily attached to the front surface of the backrest support frame through the opening of the lower end and the opening of the lower end of the long hole, by slightly loosening the bolt. Or can be removed.

  According to the invention of claim 5, since the receiving surface is formed on the receiving member separate from the back support frame, when the receiving surface is worn, only the receiving member needs to be replaced. Economical.

  Moreover, since the clearance gap for the protrusion dimension of a receiving member is formed between the back surface of a backrest board and the front surface of a backrest support frame, a backrest board can be greatly bent back.

  According to the sixth aspect of the present invention, the upper and lower sides of the backrest plate are simply fitted into the support groove of the support member protruding from the front surface of the backrest support frame by fitting the support shaft on the rear surface of the backrest plate from above. Either one of the ends can be easily attached to the front surface of the back support frame.

  Further, since the support shaft can be rotated in the support groove, the mounting portion of the backrest plate can also be rotated back and forth, and when the backrest plate is pressed by the seated person's back, the whole is rearward. Therefore, it is possible to bend elastically easily and relatively freely, and the sitting comfort is improved.

  According to the seventh aspect of the present invention, the strength of the backrest support frame is increased, so that the backrest plate can be elastically bent while being stably attached.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a chair of the present invention, comprising a leg (2) with casters (1), a pedestal (3) standing up from its center, and a seat (4) attached to the upper end thereof. A supporting base (5) to be supported and a backrest supporting frame (6) made of an aluminum alloy or the like that stands up behind both sides of the supporting base (5) are provided.

  The back support frame (6) is formed by connecting the upper ends of a pair of left and right side frames (6a) and (6a) with a rearward convex arcuate upper frame (6b) so that it is substantially vertically long downward. The lower end of the armrest (7) is fixed to the forward facing portion of the lower end of the side frame (6a).

  The backrest support frame (6) has a backrest plate (8) formed of elastic synthetically deformable hard synthetic resin, with the mesh excluding the peripheral edge, and attached to the front surface of the backrest support frame (6). A backrest (10) comprising a cushioned body (9) is attached (details will be described later).

  As shown in FIG. 2, the front end of the left and right side frames (6a) of the back support frame (6) faces in the vertical direction for attaching the upper ends of the left and right sides of the back plate (8). The protrusions (11) and (11) are integrally projected, and the two protrusions (11) have two upper and lower female screw holes (upper and lower female threads) facing in the longitudinal direction reaching the inside of the side frame (6a). 12) (12) is drilled.

  As shown in FIG. 3 and FIG. 5, each of the protrusions (11) has a receiving surface (13) made of a vertically long case-shaped synthetic resin with a front surface forming a convex curved receiving surface and an open rear surface. However, the bolt (15) inserted into the stepped hole (14) whose bottom part drilled in the upper part has a small diameter and the back part provided in the lower part are inserted into the stepped hole (14) of small diameter will be described later. A stepped bolt (25) for mounting the backrest plate is screwed into the female screw holes (12) and (12) to cover the projection (11) so that the side frame (6a) It is fixed to the front.

  As shown in FIGS. 4 and 5, the back plate (8) is provided on the front surface of the lower end portion of the both side frames (6a) facing the up-down direction, that is, the front surface of the lower portion of the bent portion having a cross-sectional shape when viewed from the side. ) Projecting parts (16) for mounting the lower part of the left and right side parts of the left and right side of the projecting part are made of synthetic resin. The upper and lower ends of the case-like support member (17) having an open support groove (17a) with an open rear surface are formed from the two female screw holes (18) (18) of the side frame (6a) from the front. A bolt (19) screwed to 18) is fixed forward so as to cover the protrusion (16).

As shown in FIG. 3 and FIG. 5, the left and right sides of the upper end of the backrest plate (8), that is, the positions facing the protrusions (11) of the upper end of the side frame (6 a) are behind the rear surface. A vertically long case-shaped mounting part (20) (20) having a front surface and a lower end surface opened is integrally formed, and a long hole (21) facing the vertical direction with the lower end opened is formed on the rear end surface. Is formed.
Note that the central portion in the left-right direction of the rear end surface of the attachment portion (20) has a concave surface that is recessed forward with substantially the same curvature as the front surface of the receiving member (13).

  As shown in FIG. 4, in the left and right sides of the lower rear surface of the backrest plate (8) (only one is shown for the left and right identical structures), that is, in the support member (17) provided at the lower part of the side frame (6a) A rectangular hole (22) facing upward and downward is formed at a position facing the support groove (17a), and a pair of left and right support pieces (23) projecting rearward from the left and right opening edges on the rear surface side. The support surface (23) is integrally formed with a support shaft (24) having a diameter and a lateral dimension that can be fitted into the support groove (17a) from above.

  In order to attach the backrest plate (8) to the backrest support frame (6), before attaching the cushion body (9), first, the arcuate shape of the support members (17) at the lower part of the left and right side frames (6a) is used. The support shafts (24) on the lower side portions of the backrest plate (8) are press-fitted into the support groove (17a) from above (see FIG. 5). In this state, since the support member (17) is sandwiched between the support pieces (23) on both sides of the support shaft (24), the lower part of the backrest plate (8) does not move in the left-right direction. . Further, since the support shaft (24) is rotatably held by the support groove (17a), the lower end portion of the backrest plate (8) can be bent back and forth about the support shaft (24). .

  In this way, after the lower end of the backrest plate (8) is held by the lower part of the backrest support frame (6), the front surface of the receiving member (13) provided at the upper ends of the left and right side frames (6a) 3 and 5 in this state, the rear surface of the mounting portion (20) projecting from the rear surfaces of the left and right sides of the upper end of the backrest plate (8) is brought into contact with the convex curved receiving surface. In this way, the stepped bolt (25) is made of a synthetic resin, and a slightly elongated pressing tool (26) whose rear surface forms a convex curved pressing surface, a thick elastic washer (27) made of hard rubber or elastomer, etc. ) Are inserted into the mounting part (20) protruding rearward from the front of the backrest plate (8), and the stepped bolt (25) is inserted into the mounting part (20 ) Is inserted in the stepped hole (14) at the lower part of the receiving member (13).

Next, a male screw part (25a) having a small diameter of the stepped bolt (25) protruding from the small diameter hole at the back of the stepped hole (14) is provided on the protruding part (11) at the upper end of the side frame (6a). Screw into the female screw hole (12) at the bottom.
At this time, it is preferable that the tightening force of the stepped bolt (25) is set so that the elastic washer (27) is slightly strongly compressed and elastically deformed, and is not excessively tightened.

  As a result, the upper end of the backrest plate (8) is stably attached to the upper ends of the left and right side frames (6a) of the backrest support frame (6) so as to be movable only in the vertical direction. In addition, even if a strong upward force is applied to the backrest plate (8), at least the upper part thereof is not likely to come off from the backrest support frame (6).

  The front and rear surfaces of the mounting portion (20) of the backrest plate (8) are sandwiched between the convex curved surface on the front surface of the receiving member (13) and the convex curved surface on the rear surface of the pressing tool (26). Since the contact area is reduced, the frictional resistance is also reduced, and the upper end portion of the backrest plate (8) can easily slide up and down.

  Further, the pressing tool (26) is tightened via the elastic washer (27) and tilts back and forth around the stepped bolt (25), so that the upper end portion of the backrest plate (8) is easily bent.

  As described above, the lower end portion of the backrest plate (8) is supported by the backrest support frame (6) so as to be pivotable back and forth, and the upper end portion is also vertically supported by the backrest support frame (6). Since it is movably attached, when the backrest plate (8) is pushed backward by the seated person's back, the whole can easily and relatively flexibly elastically, and the sitting comfort is improved. .

  In addition, even if the backrest plate (8) is elastically bent, a large load is not applied to the attachment portion between the backrest plate (8) and the backrest support frame (6), so that the durability of the attachment members is improved.

The present invention is not limited to the above embodiment.
In the above embodiment, the lower end of the backrest plate (8) is rotatably supported by the support member (17) provided on the lower front surface of the backrest support frame (6). Further, a support member (17) having the same structure as described above is provided at the upper end portion of the backrest support frame (6), and the same shape as described above provided at the upper end portion of the backrest plate (8) in the support groove (17a). The support shaft (24) is rotatably fitted and supported, and the lower end portion of the backrest plate (8) is supported by the same means as the upper mounting structure so as to be movable in the vertical direction. May be.

  Further, the support member (17) and the support shaft (24) as described above are omitted, and either one of the upper and lower ends of the backrest plate (8) is simply placed on the front surface of the backrest support frame (6). In some cases, it is supported via a bracket or the like, and only the other end is attached to the back support frame (6) so as to be slidable up and down by the same means as described above.

  In the above embodiment, the backrest plate (8) is provided with a mounting portion (20) that bulges rearwardly, and a stepped bolt (25) or a pressing tool ( 26), but without a mounting portion (20) that bulges rearward, a flat mounting portion is provided with a long hole (21) facing in the vertical direction similar to the above. The stepped bolt (25) slidably inserted into the long hole (21) may be screwed to the backrest support frame (6) via the elastic washer (27) as described above.

  Further, the elastic washer (27) may be omitted and only the pressing tool (26) may be used, or an elastic member such as a spring washer, a disc spring, or a compression coil spring may be used instead of the elastic washer (27). .

  Contrary to the above-described embodiment, a mounting portion having a long hole is provided on the backrest support frame (6) side, and a convex curved surface that can be slidably contacted with the front surface of the mounting portion on the backrest plate (8) side facing it. A receiving member having a receiving surface is provided, and the pressing tool is fixed by a bolt inserted into the long hole from the back support frame (6) side so that the pressing surface on the front surface is in sliding contact with the rear surface of the mounting portion. There is also.

It is a side view which shows one Embodiment of the chair of this invention. Similarly, it is a perspective view of the principal part of a backrest support frame. Similarly, it is a disassembled perspective view which shows the upper part of a backrest support frame and a backrest board, and those attachment means. Similarly, it is the perspective view of the principal part which shows the support structure of the lower part of a backrest support frame and a backrest board. It is an enlarged side view which shows the state which attached the backrest board, carrying out the principal part longitudinally.

Explanation of symbols

(1) Casters
(2) Leg
(3) pedestal
(4) Seat
(5) Support base
(6) Back support frame
(6a) Side frame
(6b) Upper frame
(7) Armrest
(8) Backrest board
(9) Cushion body
(10) Backrest
(11) Projection
(12) Female thread hole
(13) Receiving member
(14) Stepped hole
(15) Bolt
(16) Projection
(17) Support member
(17a) Support groove
(18) Female thread hole
(19) Bolt
(20) Mounting part
(21) Long hole
(22) Square hole
(23) Support piece
(24) Spindle
(25) Stepped bolt
(26) Pressing tool
(27) Elastic washer (elastic member)

Claims (7)

In the chair formed by attaching the upper and lower portions of the backrest plate, which at least the middle part can be elastically bent in the front-rear direction, to the front surface of the backrest support frame standing up from the rear part of the seat body,
A plate-like attachment portion provided with a long hole facing in the up-down direction is provided on either one of the upper and lower portions of the backrest plate and the backrest support frame opposed thereto, and the attachment portion is provided on the other side. And a pressing tool is provided at the tip of the bolt protruding from the receiving surface so as to penetrate the elongated hole, and is opposed to the receiving surface of the pressing tool. A chair characterized in that it is supported by being sandwiched from the front and rear so that the mounting portion can be slid in the vertical direction and can be slightly tilted in the front and rear direction by the convex curved pressing surface provided on the surface and the receiving surface. .   The chair according to claim 1, wherein an elastic member is interposed between a head provided at a tip of the bolt and a pressing tool fitted to a shaft portion of the bolt.   A part of the backrest plate is swelled rearward to form a vertically long case-shaped mounting portion whose front surface is open, and the pressing tool and the tip of the bolt are accommodated in the mounting portion. The chair according to 1 or 2.   The chair according to claim 3, wherein the lower end of the attachment portion and the lower end of the long hole are opened downward so that the pressing tool and the bolt can be inserted and removed in the vertical direction.   5. The receiving member according to claim 1, wherein a receiving member made of a synthetic resin and having a receiving surface on the front surface is attached to the front surface of the back support frame facing the pressing tool in a forward and detachable manner. Chair.   A support shaft facing in the left-right direction is projected on the rear surface of either the upper or lower side of the backrest plate, and the support shaft is rotatably supported on the front surface of the backrest support frame facing the support shaft. The chair according to any one of claims 1 to 5, further comprising a support member having a support groove that opens upward. The backrest support frame is formed by joining the upper ends of a pair of left and right side frames with an upper frame facing in the left-right direction, and supports both sides of the backrest plate by the front surfaces of the left and right side frames. The chair according to any one of claims 1 to 6.

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