JP2011120948A - Backrest structure of chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backrest structure of a chair in which the ratio of a backrest frame occupying the outside appearance of the chair is small, smart in the design, capable of reducing the weight and the number of components, and capable of improving the assemblability. <P>SOLUTION: The backrest frame 17 in a backrest 10 of the chair includes a front frame 18 and an upper reinforcing frame 26 in the lateral direction supported by the front frame. The front frame is rectangular as seen from the front, and the width of the lower part is slightly narrow. The upper reinforcing frame is supported by the front frame 18 by connecting both ends to both ends of an upper frame 18a in the upper part of the front frame 18 in the lateral direction in such a state that the center part is separated rearward from the upper frame 18a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a chair backrest structure in which a net member (including a woven fabric, a synthetic resin sheet, etc.) is stretched on the front surface of a back frame.

  Conventionally, as a backrest structure of this type of chair, an edge member is attached by molding to the periphery of a net member to which tension is applied in advance, and this edge member is fitted to a groove formed on the front side of the back frame. In such a case, a net member is stretched on the front surface of the back frame (see Patent Document 1).

  In addition, as a conventional chair backrest structure, a sandwiching piece fastened to the periphery of the net member is inserted into a circumferential holding groove provided on the back of the outer periphery of the back frame, and is attached to the back of the back frame. There is known a technique in which a net member is stretched on the upper surface of a back frame by applying tension to the net member by pushing the inserted piece into a holding groove with an attached clamping frame (Patent Document 2). reference).

Japanese National Patent Publication No. 8-507935 Japanese Patent Application Laid-Open No. 2004-49585

  However, in the former case, it is necessary to increase the width of the back frame in order to prevent the bending of the back frame against the force applied to the net member when the user is seated, and the peripheral material around the net member is fitted. The groove to be formed is on the front side of the back frame, and the periphery of the back frame is exposed from the net member, so the back frame accounts for too much of the appearance of the chair and lacks smart design There's a problem.

  The latter prevents the back frame from bending due to the force applied to the net member when the user is seated by the double frame material of the back frame and the fastening frame. Since the width of the tightening frame can be reduced and the net member covers the entire front side of the back frame, the ratio of the back frame to the appearance of the chair is small and the design is smart.

  However, because of the double structure of the back frame and the fastening frame, there is a problem that the weight is large and the number of parts is large, so that it takes time to assemble and the cost is high.

  In view of the above-mentioned problems of the prior art, the present invention has a small proportion of the back frame in the appearance of the chair, is smart in design, is lightweight, reduces the number of parts, and improves assembly. An object of the present invention is to provide a backrest structure of a chair that can achieve the above.

According to the present invention, the above problem is solved as follows.
(1) The back frame of the back of the chair is almost square in front view, and the center part is located at the front frame with the lower part slightly narrowed, and at both ends of the upper frame facing the left and right direction of the upper part of the front frame. And an upper reinforcing frame that faces the left and right directions supported by the front frame by joining both ends so as to be separated rearward from the upper frame.

With such a configuration, both ends of the upper frame in the front frame of the back frame are joined to both ends of the upper reinforcing frame with the central portion spaced rearward, so that the upper frame is not widened and the back frame is widened. The strength of the upper part of the frame can be maintained, and not only can it give a smart impression in terms of design, but also it can be lighter, reduce the number of parts, and improve the assemblability compared to the conventional one using double frame material. Can be planned.
Further, when the seated person falls back, the center part of the upper frame can be slightly elastically bent backward while maintaining the strength with the upper reinforcing frame, and a soft seating feeling can be obtained.
Moreover, for example, a headrest or a hanger for hanging clothes can be easily attached to the upper reinforcing frame, and the upper reinforcing frame can be used as a handle when the chair is moved.

  (2) In the above item (1), the back frame is further arranged at both ends of the lower frame facing the left-right direction of the lower part of the front frame, and the center part is separated rearward from the lower frame. It is assumed that a lower reinforcing frame facing in the left-right direction with the parts joined is provided.

  With such a configuration, both end portions of the lower frame in the front frame of the back frame are joined to both end portions of the lower reinforcing frame with the central portion spaced rearward. Not only can the strength of the lower part of the frame be maintained, giving a smart impression, but also when the chair moves, for example, even if the chairs come into contact with each other, the lower frame is protected by the lower reinforcing frame, so the lower frame It is possible to prevent damage to the lower part of the.

  (3) In the above item (1) or (2), the vertical cross-sectional shape of the lower reinforcing frame in the back frame is substantially L-shaped.

  With such a configuration, the strength of the lower reinforcing frame can be increased.

  (4) In any one of the above items (1) to (3), the upper frame of the front frame and the upper reinforcing frame of the back frame are formed in a three-month shape in plan view with a central portion in the left-right direction recessed backward. To do.

  With such a configuration, not only the overall strength of the back frame can be increased, but also a smart impression can be given in terms of design.

  (5) In any one of the above items (1) to (4), a net member is stretched on the front surface of the front frame.

By combining such a configuration with the configuration described in the above item (1), the upper reinforcing frame can sufficiently withstand even if the horizontal tension of the upper portion of the net member is strengthened.
In addition, due to the combination with the configuration of the above item (2), the upper and lower reinforcing frames provided at the upper and lower portions of the front frame can obtain a large strength opposite to the tension in the left and right direction of the net member. The tension in the direction can be strengthened.

  According to the present invention, the ratio of the back frame to the appearance of the chair is small, the design is smart, the weight of the chair is reduced, the number of parts is reduced, and the assemblability can be improved. Can be provided.

It is a front view of a chair provided with one embodiment of the present invention. Similarly, it is a side view. Similarly, it is the whole perspective view seen from back. Similarly, it is the perspective view which looked at the backrest from the front. Similarly, it is the VV sectional view taken on the line of FIG. Similarly, it is the VI-VI sectional view taken on the line of FIG. Similarly, it is an expansion perspective view of the VII part in FIG. Similarly, it is the fragmentary perspective view of the back frame which attached the hanger to the upper reinforcement frame of the rear part of the upper frame.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 and 2 show the appearance of a chair provided with an embodiment of the present invention. FIG. 1 is a front view and FIG. 2 is a side view. In this embodiment, the chair backrest structure is applied to a reclining chair.

  As shown in FIG. 1 and FIG. 2, the reclining chair 1 includes a leg body 4 having five radial rods 3 each having a caster 2 provided at a distal end portion. In the center of the leg 4, an extendable leg column 6 having a gas spring 5 is erected, and the rear part of the support base 7 is fixed to the upper end of the leg column 6.

  The support base 7 has a substantially rhombus-like hollow box shape with the upper surface of the front half opened, and arm parts 8 and 8 extending in the left and right directions are integrally formed on both side surfaces of the front part of the support base 7. ing.

  A pivot 9 made of a hexagonal shaft that faces in the left-right direction is passed through substantially the center in the front-rear direction of the support base 7, and left and right that support the backrest 10 are supported at both ends of the pivot 9 that protrudes on both sides from the support base 7. In the pair of backrest support rods 11, 11, cylindrical portions 11 a, 11 a facing the left and right direction formed at the front end portion of the lower portion facing forward are fixedly fitted, and the pivot 9, the backrest support rods 11, 11 and the backrest 10 are fixed. And can rotate with respect to the support base 7 integrally with each other around the axis of the pivot 9.

  Inside the support base 7 is a rubber torsion unit for biasing the pivot 9 counterclockwise and its biasing force adjusting means (not shown), and at the center of the lower surface of the front part of the support base 7 is a rubber torsion unit. A gas spring unit 13 is provided in cooperation with the unit to assist the urging force of the rubber torsion unit. By these, urging means for urging the backrest 10 in the direction of standing is formed.

  Short standing arms 12, 12 are projected upward from the left and right back support rods 11, 11 slightly behind the pivot 9, and seats are provided at the upper ends of the standing arms 12, 12. The rear end portions of a pair of left and right seat receiving frames 15 and 15 that support the both sides of 14 and face in the front-rear direction are connected to each other with a shaft 16 that faces in the left-right direction.

  Next, a backrest structure according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 3, the back frame 17 constituting the backrest 10 includes a front frame 18 made of a synthetic resin having a substantially square front shape (the lower portion is slightly narrower). The front frame 18 has an upper and lower upper frame 18a and a lower frame 18b that face the left and right direction, and ends of the upper and lower frames 18a and 18b connected to each other, and wider than the upper and lower frames 18a and 18b. It consists of a left side frame 18c and a right side frame 18d. The upper and lower frames 18a and 18b and the left and right side frames 18c and 18d are secured to the periphery of a net member described later.

  As shown in FIGS. 4 and 5, a pair of vertical grooves 19, 20 facing in the vertical direction are provided on the outer surfaces of the left and right side frames 18 c, 18 d.

  As shown in FIG. 6, hook-shaped lateral groove strips 21 and 22 facing in the left-right direction are provided at the corners of the lower surface and the front surface of the upper frame 18 a and the corner portions of the upper surface and the front surface of the lower frame 18 b. Yes.

  The net member 23 is formed of, for example, a high-tensile plastic or other elastic fiber knitted or woven into a net shape (including a porous sheet member). Synthetic resin edge members 24 and 24 fitted into the vertical groove strips 19 and 20, and upper and lower edges have hook-shaped portions 25 a and 25 a at the tip portions, and engage with the horizontal groove strips 21 and 22. The synthetic resin edges 25, 25 are fixed by molding.

  The dimension of the net member 23 to which the edge members 24, 24, 25, 25 are attached is such that when the edge members 24, 24, 25, 25 are inserted or engaged with the longitudinal grooves 19, 20 and the transverse grooves 21, 22 It is predetermined so that an appropriate tension is applied to the net member 23.

  Accordingly, as shown in FIGS. 5 and 6, the left and right edge members 24, 24 of the net member 23 are fitted into the vertical grooves 19, 20 of the left and right side frames 18 c, 18 d, and the upper and lower ends of the net member 23 are By engaging the upper and lower edge members 25 and 25 with the upper and lower horizontal grooves 21 and 22 so that the vicinity of the portion is wound from the front surface of the upper and lower frames 18a and 18b to the rear surface through the upper and lower surfaces, the net member 23 is The entire front surface of the front frame 18 can be tensioned.

  Thus, since the front surface of the front frame 18, that is, the entire front surface of the back frame 17 is covered with the net member 23, the ratio of the back frame 17 to the appearance of the chair is small, and a smart design impression can be given. .

  As shown in FIGS. 3, 6, and 8, the left and right ends of the upper reinforcing frame 26 in a circular arc shape in plan view are arranged on both sides of the rear surface of the upper frame 18 a in the front frame 18, and the center portion is the upper frame 18 a. The upper reinforcing frame 26 and the upper frame 18a are integrally coupled so as to be separated further rearward and downward, and have a three-month shape in plan view with the central portion recessed backward.

The upper reinforcing frame 26 cooperates with the upper frame 18a to maintain the strength of the upper portion of the back frame 17, and to allow the upper frame 18a to be slightly elastically bent when the seated person falls on the backpack 10. To act.
For example, as shown by an imaginary line in FIG. 4, the headrest 27 is attached to the upper reinforcing frame 26 without hindering the attachment of the net member 23 by utilizing the fact that the upper reinforcing frame 26 is separated from the front upper frame 18 a. The hanger 28 for hanging clothes can be detachably attached as shown in FIG.

That is, the hanger 28 abuts the central hanging portion 29 against the rear surface of the upper reinforcing frame 26, holds the front and rear with a pair of mounting brackets 30, 30, and attaches both mounting brackets 30, 30 to the screws 31, 31. Can be easily attached to the upper reinforcing frame 26.
The upper reinforcing frame 26 can also be used as a handle for moving the chair.

  As shown in FIGS. 4 and 7, both ends of the lower reinforcing frame 32 facing in the left-right direction are integrally coupled to lower ends of the left and right side frames 18 c, 18 d in the front frame 18. The lower frame 18b has its central portion spaced forward from the lower reinforcing frame 32, both end portions are in contact with the front surfaces of both end portions of the lower reinforcing frame 32, and are screwed from the front with screws 33. .

  The lower end portion of the net member 23 is screwed to the lower frame 18b from below after the lower frame 18b is screwed to the front surface of the lower reinforcing frame 32, and the lower edge member 25 is locked to the lateral groove 22 of the lower frame 18b. Thus, it is attached to the lower frame 18b. When the chair is discarded, a tool such as a screwdriver (not shown) is pierced into the net member 23 and engaged with the head of the screw 33, and the screw 33 is turned off to remove the lower frame 18b from the lower reinforcing frame 32. Can be removed. Thereafter, the net member 23 is separated from the back frame 17 by sequentially removing the upper edge of the net member 23 and then the left and right side edges together with the edge members 25, 24 and 24 from the upper frame 18 a and the left and right side frames 18 c and 18 d. It can be discarded separately or replaced with a new one.

  Further, since the lower reinforcement frame 32 is provided, when the chair 1 is moved, for example, when the chairs come into contact with each other, the lower frame 18b side is protected by the lower reinforcement frame 32, so that the lower frame 18b and the net member 23 are protected. It is possible to prevent the lower end portion of the base plate from being damaged.

  In the above-described embodiment, the example in which the upper reinforcing frame 26 and the lower reinforcing frame 32 are attached to the rear surfaces of the upper and lower frames 18a and 18b in the front frame 18 has been described. However, either the upper reinforcing frame 26 or the lower reinforcing frame 32 is used. One of them can be omitted.

DESCRIPTION OF SYMBOLS 1 Reclining chair 2 Caster 3 Leg rod 4 Leg body 5 Gas spring 6 Leg column 7 Support base 8 Arm part 9 Axis 10 Backrest 11 Supporting collar 11a cylinder part 12 Standing arm 13 Gas spring unit 14 Seat 15 Seat receiving frame 16 Shaft 17 Back frame 18 Front frame 18a Upper frame 18b Lower frame 18c Left frame 18d Right frame 19, 20 Vertical groove strips 21, 22 Horizontal groove strips Net members 24, 25 Edge member 25a Ridge portion 26 Upper reinforcement frame 27 Headrest 28 Hanger 29 Part 30 Mounting bracket 31 Screw 32 Lower reinforcement frame 33 Screw

Claims (5)

  The back frame of the backrest of the chair is substantially square when viewed from the front, and the lower part is slightly narrower. A backrest structure for a chair, comprising: an upper reinforcing frame facing the left-right direction supported by the front frame by joining both ends so as to be separated rearward from the frame.   The back frame further has a lower side facing the left and right direction in which both ends are coupled to both ends of the lower frame facing the left and right direction of the lower part of the front frame so that the center part is separated rearward from the lower frame. The chair backrest structure according to claim 1, further comprising a reinforcing frame.   The backrest structure of the chair according to claim 2, wherein a longitudinal cross-sectional shape of the lower reinforcing frame in the back frame is substantially L-shaped.   The backrest structure of the chair according to any one of claims 1 to 3, wherein the upper frame of the front frame and the upper reinforcing frame in the back frame have a crescent shape in plan view in which a central portion in the left-right direction is recessed backward. .   The backrest structure of the chair according to any one of claims 1 to 4, wherein a net member is stretched on a front surface of the front frame.

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