JP2017221491A - Load support member for chair and chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load support member for a chair and a chair where it is possible to easily obtain a shape that can excellently support the body of a sitter.SOLUTION: A load support member for a chair includes: a pair of frame members; a first plate member having a first load receiving surface; a second plate member having a second load receiving surface; and an intermediate member arranged in a space part between the first plate member and the second plate member. The first plate member is hung across first parts 13-1 between the pair of frame members. The second plate member is hung across second parts 13-2 separated in a longitudinal direction from the first parts 13-1 of the pair of frame members. The first plate member and the second plate member are arranged between the pair of frame members so that end parts in a chair width direction orient a direction different in a lateral view of the chair.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a load support member for a chair such as a backrest and a seat, and a chair including the same.

  As a backrest structure that supports the load on the back of the seated person, a structure in which the backrest main body is fixed to a pair of frame members extending in the vertical direction by bolt fastening, fitting, or the like (for example, (See Patent Documents 1 and 2).

  In the chair described in Patent Document 1, mounting plates protruding inward in the chair width direction are fixed to the left and right frame members extending in the vertical direction by welding or the like, and the backrest main body (back plate) ) Is bolted.

  In the chair described in Patent Document 2, mounting grooves are provided in the left and right frame members extending in the vertical direction, and back plates are fitted and fixed in the mounting grooves of the left and right frame members. A back plate that is in contact with the front surface of the back plate by a plurality of protrusions is attached to the front portion of the back plate. In this chair, the back plate and the back plate constitute a backrest main body for supporting the load on the back of the seated person on the left and right frame members.

Japanese Patent No. 4551030 Japanese Patent No. 5259994

  By the way, the above-mentioned chair load support member such as the backrest has a three-dimensional load receiving surface for receiving the load of the seated person for the purpose of increasing the strength against the input load or improving the seating feeling. May be formed into a curved or bent shape.

  However, if the entire load receiving surface of the chair load support member such as a backrest or a seat is formed of an integral member, problems such as difficulty in manufacturing the chair load support member are likely to occur.

  Therefore, the present invention is intended to provide a load support member for a chair and a chair that can easily obtain a shape capable of suitably supporting the body of a seated person.

The chair load supporting member according to the present invention employs the following configuration in order to solve the above problems.
In other words, the chair load supporting member according to the present invention is arranged so as to be spaced apart in the chair width direction, and the pair of frame members extending in the longitudinal direction intersecting the load input direction, and the pair of the frame members. A first plate member that is constructed between one part and has a first load receiving surface that receives a load of a seated person, and a pair of the frame members that are spaced apart from each other in the longitudinal direction. A second plate member constructed between the second parts and having a second load receiving surface for receiving the load of the seated person, and a space between the first plate member and the second plate member And an intermediate member whose surface is located between the first load receiving surface and the second load receiving surface, the first plate member and the second plate member are The end of the chair width direction is oriented in a different direction in the side view of the chair By being arranged between the pair of frame members, the first load receiving surface, the second load receiving surface, and the surface of the intermediate member form a bent shape or a curved shape in a side view. The entire load receiving surface is configured.

  In the case of the present invention, the first load receiving surface and the second load receiving surface of the first plate member and the second plate member that are separately installed on the pair of frame members are partially received by the seat occupant. It is comprised by the load receiving surface. Since the end portions of the first plate member and the second plate member in the chair width direction are arranged between the pair of frame members so as to be directed in different directions in a side view of the chair, the first plate member and While suppressing bending and bending to be formed on the second plate member, the entire load receiving surface (the first load receiving surface, the second load receiving surface, and the load receiving surface combining the surfaces of the intermediate members) is formed in a desired tertiary The original shape can be obtained. Further, since the space between the first plate member and the second plate member is narrowed by the intermediate member, the seated person feels discontinuity between the first plate member and the second plate member. It becomes difficult and clothes and articles | goods become difficult to pinch | interpose between a 1st board member and a 2nd board member.

The second portion of each frame member may have a widened portion whose width in the load input direction from the seated person is wider than the width in the load input direction of the end portion near the first portion.
In this case, since the second portion of the frame member on which the second plate member is installed has the widened portion, the end portion of the second plate member in the chair width direction is the chair width direction of the first plate member. Even in the case where the second plate member is arranged with a large inclination with respect to the end portion of the second plate member, by arranging a part of the end portion in the chair width direction of the second plate member in the widened portion, It can be suppressed from protruding before and after in the load input direction. Therefore, by adopting this configuration, the entire load receiving surface can be easily formed into a desired shape capable of suitably supporting the seated person's body, and the appearance can be improved.

The near side in the load input direction of the second part is formed in a straight line so as to be continuous with the near side in the load input direction of the first part, and the load input direction of the second part It is desirable that the back side of the second side be inclined with respect to the front side of the second part so that the width in the load input direction gradually increases as the distance from the first part increases.
In this case, since the front side of the second part of the frame member in the load input direction is linearly formed so as to be continuous with the front side of the first part in the load input direction, the side facing the seated person Protrusions are less likely to occur. For this reason, a seated person and a pedestrian become difficult to contact | abut with respect to the near side of the load input direction of a 2nd site | part, and the usability of a chair improves. Further, since the back side of the second part in the load input direction is inclined with respect to the near side, the widened portion is formed so that the width of the second part in the load input direction is gradually increased. The appearance of will also improve.

The intermediate member may be a connection frame that connects the pair of frame members.
In this case, since the intermediate member disposed between the first plate member and the second plate member also functions as a connecting frame that connects the pair of frame members, the pair of frame members and the intermediate member cooperate to be robust. A simple structure. Therefore, by adopting this configuration, it is possible to increase the rigidity of the entire chair load support member while suppressing an increase in the number of parts.

It is desirable that the intermediate member has a support wall that comes into contact with a surface on the back side in the load input direction of at least one of the first plate member and the second plate member.
In this case, the input load of at least one of the first plate member and the second plate member can be received by the support wall of the intermediate member. Therefore, by adopting this configuration, the first plate member or the second plate member can be eliminated while eliminating or reducing the thickness increase or bending for maintaining the strength of the first plate member or the second plate member. It is possible to support the load of the seated person input to the plate member with high strength.

  Moreover, in order to solve the said subject, the chair which concerns on this invention is equipped with one of the said load support members for chairs, It is characterized by the above-mentioned.

According to the present invention, a part of the load receiving surface that receives the load of the seated person is constituted by the first load receiving surface of the first plate member and the second load receiving surface of the second plate member, The intermediate member is disposed in the space between the first plate member and the second plate member, and the end portions in the chair width direction of the first plate member and the second plate member are in a side view of the chair. Are arranged between the pair of frame members so as to be directed in different directions, so that the first load receiving surface, the second load receiving surface and the surface of the intermediate member are bent in a side view, or A whole load receiving surface having a curved shape is formed. For this reason, the shape which can support a seated person's body suitably can be obtained easily.
Further, according to the present invention, since the intermediate member is disposed in the space between the first plate member and the second plate member, the seat occupant is between the first plate member and the second plate member. This makes it difficult to feel discontinuity and makes it difficult for clothes and articles to be sandwiched between the first plate member and the second plate member. Therefore, by adopting the present invention, comfort at the time of sitting can be improved.

It is a perspective view of the chair concerning one embodiment of the present invention. It is a perspective view of the chair concerning one embodiment of the present invention. It is a front view of the chair concerning one embodiment of the present invention. It is a side view of the chair concerning one embodiment of the present invention. It is a disassembled perspective view of the chair which concerns on one Embodiment of this invention. It is a rear view of the chair which concerns on one Embodiment of this invention. It is sectional drawing which follows the VII-VII line of FIG. 6 of the chair which concerns on one Embodiment of this invention. It is sectional drawing which follows the VIII-VIII line of FIG. 6 of the chair which concerns on one Embodiment of this invention. It is sectional drawing which follows the IX-IX line | wire of FIG. 6 of the chair which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The chair 10 according to the present embodiment is a chair installed in a stadium, a theater, a lecture hall, or the like. In the following description, front / rear, left / right, and upper / lower designations refer to orientations that coincide with the orientation centered on the seated person when the seated person is seated in the chair 10 in a normal posture unless otherwise specified. Shall. In the present embodiment, the chair width direction means the left-right direction of the chair 10.
In addition, arrows UP, FR, and LH pointing upward, forward, and leftward with respect to the seated person are marked at appropriate positions in each drawing.

FIG. 1 is a view of a chair 10 according to the present embodiment installed on a corrugated floor 1 such as a stadium from an obliquely upper left front side, and FIG. 2 shows the chair 10 similarly installed on the corrugated floor 1. It is the figure seen from back side diagonally upward. 3 is a view of the chair 10 as viewed from the front, and FIG. 4 is a view of the chair 10 as viewed from the right side.
The chair 10 according to the present embodiment is installed on the front side of an arbitrary step portion of the corrugated floor 1. In the present embodiment, a plurality of chairs 10 are arranged side by side as a set. The plurality of chairs 10 forming a set is supported and fixed to a metal beam member 2 fixedly installed on the corrugated floor 1. The beam member 2 has a rectangular cross-sectional shape extending in the left-right direction. The beam member 2 is fixed to the front surface 1 a of the step portion of the step floor 1 by a plurality of brackets 3. The beam member 2 and the plurality of brackets 3 constitute an installation base for installing a plurality of chairs 10 on the corrugated floor 1.
In this embodiment, the installation base including the beam member 2 and the bracket 3 is fixed to the front surface of the corrugated floor 1, but the installation base may be fixed to the upper surface of the corrugated floor 1. In this case, the beam member may be integrated with a leg member such as a side frame 13 described later, and the installation base may be configured by the beam member and the leg member.

The chair 10 according to the present embodiment includes a backrest 11 that supports the back and waist of the seated person and a seat 12 that supports the buttocks and thighs of the seated person.
The backrest 11 is composed of a pair of side frames 13 (frame members) that are spaced apart from each other in the width direction of the chair 10 and a connecting frame 14 that connects the substantially central portions of the left and right side frames 13 in the longitudinal direction. An intermediate member), a first back plate member 15 (first plate member) installed on the left and right side frames 13 on the upper side of the connecting frame 14, and left and right side frames on the lower side of the connecting frame 14. 13 and a second back plate member 16 (second plate member).
In the present embodiment, the backrest 11 constitutes a load support member for a chair.

The left and right side frames 13 and the connecting frame 14 are formed of a metal member having a substantially rectangular cross section. The lower ends of the left and right side frames 13 are fixed to the beam member 2 in a fitted state. The left and right side frames 13 are installed with the upper side inclined backward by a predetermined angle with respect to the vertical direction.
In the present embodiment, the first back plate member 15 and the second back plate member 16 are made of wood such as plywood. However, the material for forming the first back plate member 15 and the second back plate member 16 is not limited to wood, but may be other materials such as resin.

  The seat 12 is coupled to a pair of side frames 17 that are spaced apart from each other in the width direction of the chair 10, a seat plate member 18 that is installed on the left and right side frames 17, and the left and right side frames 17. A substantially U-shaped base frame 19 that supports the side frame 17 and the seat plate member 18 is provided. The left and right side frames 17 and the base frame 19 are made of a metal material. The seat plate member 18 is made of wood such as plywood, resin, or the like. The base 12 of the base frame 19 is supported by the left and right side frames 13 of the backrest 11 via a rotation mechanism 20 so as to be rotatable. The rotation mechanism 20 is disposed in the vicinity of the lower ends of the left and right side frames 13. The seat 12 pivots and displaces between a seating position that has fallen forward substantially horizontally and a storage position that springs up along the backrest 11. The rotation mechanism 20 has a biasing spring (not shown) that biases the seat 12 in the storage position direction.

As shown in FIGS. 3 and 4, the end of the first back plate member 15 in the chair width direction is fitted and fixed to the inner surface of the left and right side frames 13 of the backrest 11 in the chair width direction. The first fitting groove 21 and the second fitting groove 22 in which the end portion in the chair width direction of the second back plate member 16 is fitted and fixed are formed. The first fitting groove 21 and the second fitting groove 22 are spaced apart from each other in the longitudinal direction of the side frame 13. The first back plate member 15 is fitted between the upper fitting regions 21 of the left and right side frames 13 by fitting both end portions in the chair width direction into the first fitting grooves 21 of the corresponding left and right side frames 13. It is built in. Similarly, the second back plate member 16 has both end portions in the chair width direction fitted into the second fitting grooves 22 of the corresponding side frames 13 on the left and right sides. It is built between the lower areas. Between the first back plate member 15 and the second back plate member 16 installed on the left and right side frames 13, a substantially rectangular space portion that is long in the chair width direction is formed. The space is closed by the connecting frame 14.
In the case of this embodiment, the front surface of the connecting frame 14 facing the back of the seated person is the first back plate member 15 in the space between the first back plate member 15 and the second back plate member 16. And the second back plate member 16 is disposed so as to be slightly recessed rearward with respect to the front surface of the facing portion.

  In the present embodiment, as shown in FIG. 4, the longitudinal region of the left and right side frames 13 where the first fitting grooves 21 are formed constitutes the first portion 13-1. A longitudinal region where the second fitting groove 22 is formed constitutes the second portion 13-2. Moreover, the connection frame 14 is arrange | positioned in the space part between the 1st back board member 15 (1st board member) and the 2nd back board member 16 (2nd board member), The surface is the 1st. The intermediate member located between the load receiving surfaces of the back plate member 15 and the second back plate member 16 is configured.

  As shown in FIG. 4, the left and right side frames 13 have a width in the load input direction (a width in the front-rear direction) that extends from the upper end portion to a substantially central portion in the longitudinal direction (a region including the first portion 13-1). Is formed to have a substantially constant width, and a region extending from a substantially central portion to a lower end portion in the longitudinal direction (a region including the second portion 13-2) is formed such that the width in the load input direction gradually increases toward the lower end. Has been.

  More specifically, the near side a-1 (front side) of the left and right side frames 13 in the load input direction is formed in a substantially linear shape except for the lowermost end. On the other hand, the back side a-2 (back side) in the load input direction of the left and right side frames 13 is a front side a-1 in the load input direction in the region extending from the upper end to the substantially central portion in the longitudinal direction. And in a region extending from a substantially central part to a lower end part in the longitudinal direction, is inclined by a set angle α with respect to the near side a-1 in the load input direction. The inclination of the region extending from the substantially central part to the lower end part in the longitudinal direction of the back side a-2 in the load input direction is inclined so that the width in the load input direction of the side frame 13 gradually increases toward the lower side. .

Therefore, the near side a-1 of the second part 13-2 is formed in a straight line so as to be continuous with the near side a-1 in the load input direction of the first part 13-1, and the second part The back side a-2 of the load input direction 13-2 is located on the front side a-1 of the second part 13-2 so that the width in the load input direction gradually increases as the distance from the first part 13-1 increases. It is inclined with respect to it. In the present embodiment, the widened portion 23 having a width in the load input direction that is substantially wider than the width in the load input direction of the end portion closer to the first portion 13-1 except for the upper end portion of the second portion 13-2. It is composed.
In the present embodiment, almost the entire region excluding the upper end of the second portion 13-2 constitutes the widened portion 23. However, the widened portion 23 receives only a part of the second portion 13-2 as a load input. It is also possible to swell and configure in the back side or the near side in the direction.

  The first back plate member 15 laid between the first portions 13-1 of the left and right side frames 13 is a first whose front side region receives the load on the upper half of the seated person's back. Load receiving surface 15a. In addition, the second back plate member 16 laid between the second portions 13-2 of the left and right side frames 13 has a front side region that loads the lower half of the seated person's back. The second load receiving surface 16a to be received is used. The first load receiving surface 15a and the second load receiving surface 16a are curved so that the central region in the chair width direction is gently recessed in the rearward direction when the chair 10 is viewed from above. In the case of this embodiment, both end portions in the chair width direction of the first back plate member 15 and the second back plate member 16 have a constant width and extend linearly in a substantially vertical direction.

By the way, the first fitting groove 21 and the second fitting groove 22 of the left and right side frames 13 are the same as the both ends of the first back plate member 15 and the second back plate member 16 in the chair width direction. And a straight line extending in a substantially vertical direction. However, the extending directions of the first fitting groove 21 and the second fitting groove 22 are formed so as to be directed in different directions in a side view of the chair 10. More specifically, the first fitting groove 21 extends so as to be substantially parallel to the front side a-1 of the side frame 13, whereas the second fitting groove 22 is The side frame 13 extends so as to incline backward by a set angle α with respect to the near side a-1 of the side frame 13.
Therefore, the end portion of the first back plate member 15 fitted in the first fitting groove 21 in the chair width direction and the second back plate member 16 fitted in the second fitting groove 22. It is arrange | positioned so that the edge part of a chair width direction may point in a different direction by the side view of the chair 10. As shown in FIG. Specifically, the end portion in the chair width direction of the second back plate member 16 is arranged so as to be inclined rearward and downward by a set angle α with respect to the end portion in the chair width direction of the first back plate member 15. Has been. As a result, the backrest 11 according to the present embodiment has an overall load receiving surface constituted by the first load receiving surface 15a, the second load receiving surface 16a, and the surface of the connecting frame 14 that is an intermediate member. ing. The entire load receiving surface has a bent shape or a curved shape in a side view.

FIG. 5 is an exploded view of the joint between the right side frame 13 and the connecting frame 14 of the backrest 11, and FIG. 6 is a view of the backrest 11 as seen from the rear side. 7 to 9 are cross-sectional views of the respective portions of the backrest 11 shown in FIG.
A pair of support walls 24 extending from the back side (backward side) in the load input direction to the upper side and the lower side are extended at the edges on both sides in the chair width direction of the connecting frame 14. The outer end surface of each support wall 24 in the chair width direction is formed flat and is in contact with the inner side surface of the side frame 13 in the chair width direction. Further, at the edges of both sides of the connecting frame 14 in the chair width direction, a protrusion that protrudes in a mountain shape on the back side (rear side) in the load input direction with respect to the support wall 24 at a substantially intermediate position between the upper and lower support walls 24. A portion 25 is formed. The outer end surface of the projecting portion 25 in the chair width direction is formed flat so as to be continuous with the end surface of the general portion 14 a of the connecting frame 14, and these end surfaces are in contact with the inner side surface of the side frame 13 in the chair width direction. It has become. A screw hole 26 is formed on the outer end surface of the projecting portion 25 in the chair width direction, and a positioning projection 27 projects from the end surface of the general portion 14 a of the connecting frame 14.

  Further, at the substantially central portion in the longitudinal direction of the left and right side frames 13, a protruding portion that protrudes in a mountain shape from the back surface (rear surface) in the load input direction toward the back side (rear side) in the load input direction 28 (frame side protrusion) is formed. The inner side surface in the chair width direction of the protruding portion 28 is formed flush with the inner side surface in the chair width direction of the general portion of the side frame 13, and the outer end surface in the chair width direction of the protruding portion 25 of the connecting frame 14. It comes to contact. An insertion hole 29 corresponding to the screw hole 26 of the protrusion 25 of the connecting frame 14 is formed in the protrusion 28 of the side frame 13. A positioning hole 40 (see FIG. 8) is formed at a position corresponding to the positioning protrusion 27 of the connecting frame 14 on the inner side surface of the side frame 13 in the chair width direction.

  Both ends of the connecting frame 14 in the chair width direction are butted against the inner side surfaces of the left and right side frames 13 in the chair width direction, and the positioning protrusions 27 are fitted in the positioning holes 40 of the corresponding side frames 13. The screw hole 26 of the protrusion 25 and the corresponding insertion hole 29 of the side frame 13 are aligned. In this state, the shaft portion of the screw 30 is inserted into the screw hole 26 on the connection frame 14 side through the insertion hole 29, and the screw 30 is tightened into the screw hole 26. Thereby, the both ends of the connecting frame 14 in the chair width direction are fastened and fixed to the corresponding left and right side frames 13.

  When the connection frame 14 is fastened and fixed to the side frame 13 as described above, the upper and lower support walls 24 at the end in the chair width direction are respectively connected to the arrangement region of the first back plate member 15 and the second support wall 24. It protrudes into the arrangement area of the back plate member 16. In this way, the support wall 24 protruding to the respective arrangement regions of the first back plate member 15 and the second back plate member 16 has the front surfaces thereof at the inner positions in the chair width direction of the left and right side frames 13, The first back plate member 15 and the second back plate member 16 are in contact with respective back surfaces (surfaces on the back side in the load input direction).

  In the present embodiment, the support wall 24 is provided on the connection frame 14 so as to contact the back surface of the first back plate member 15 and the second back plate member 16 in the load input direction. You may make it provide the support wall 24 in the connection frame 14 so that it may contact | abut only to the surface of either one of the 1st back board member 15 and the 2nd back board member 16 in the load input direction.

As described above, the backrest 11 of the chair 10 according to the present embodiment is constructed such that a part of the load receiving surface for receiving the load on the back of the seated person is installed at two positions spaced apart from each other on the left and right side frames 13. The first back plate member 15 and the second back plate member 16 are constituted by the first load receiving surface 15a and the second load receiving surface 16a, and the first back plate member 15 and the second back plate member. The connecting frame 14 that is an intermediate member is disposed in the space between the first back plate member 15 and the end portion in the chair width direction of the second back plate member 16 in a side view of the chair 10. Are arranged between the left and right side frames 13 so as to be directed in different directions. The backrest 11 according to the present embodiment has an overall load that is bent or curved in a side view by the first load receiving surface 15a, the second load receiving surface 16a, and the surface of the connecting frame 14. It constitutes the receiving surface. For this reason, the entire load receiving surface of the backrest 11 can be formed into a desired three-dimensional shape while suppressing bending and bending provided to the first back plate member 15 and the second back plate member 16 to a small extent.
In addition, in the backrest 11 of the chair 10 according to the present embodiment, the space formed between the first back plate member 15 and the second back plate member 16 is closed by the connecting frame 14 that is an intermediate member. Therefore, when the seated person leans on the backrest 11, it becomes difficult to feel discontinuity between the first backboard member 15 and the second backboard member 16, and clothes and articles are not The connecting frame 14 can prevent the back plate member 15 and the second back plate member 16 from being pinched.
Therefore, by adopting the configuration according to the present embodiment, the backrest 11 having a desired three-dimensional load receiving surface can be easily formed and the comfort at the time of sitting can be increased.

  Further, the backrest 11 according to the present embodiment is such that the second portion 13-2 of the left and right side frames 13 has a width in the load input direction that is closer to the first portion 13-1 than the width in the load input direction. Has a widened portion 23. For this reason, even when the end portion in the chair width direction of the second back plate member 16 is greatly inclined in the front-rear direction with respect to the end portion in the chair width direction of the first back plate member 15, By disposing a part of the end portion in the chair width direction of the back plate member 16 in the widened portion 23, the end portion in the chair width direction of the second back plate member 16 protrudes from the front and rear of the second portion 13-2. It can be erected on the side frame 13 without margin. Therefore, when the structure which concerns on this embodiment is employ | adopted, while being able to form a load receiving surface easily in the desired shape which can support a seated person's body suitably, appearance can be improved.

In particular, in the backrest 11 according to the present embodiment, the near side a-1 in the load input direction of the second part 13-2 is different from the near side a-1 in the load input direction of the first part 13-1. On the other hand, the width in the load input direction gradually increases as the back side a-2 in the load input direction of the second part 13-2 is separated from the first part 13-1. Thus, it inclines with respect to the near side a-1 of the 2nd site | part 13-2. As a result, almost the entire region excluding the end of the second part 13-2 near the first part 13-1 is a widened part 23 in which the width in the load input direction gradually increases. For this reason, the front side a-1 of the side frame 13 facing the seated person or the pedestrian is linear in the entire region and the portion protruding forward is reduced, so that the seated person or the pedestrian can move toward the front side a-. It becomes difficult to get caught in one part. Therefore, the usability of the chair 10 including the backrest 11 is improved.
Moreover, in the backrest 11 which concerns on this embodiment, when the back side a-2 of the load input direction of the 2nd site | part 13-2 inclines with respect to this side side a-1, the 2nd site | part 13-2. Since the widened portion 23 is formed so that the width in the load input direction gradually increases, the appearance of the side frame 13 is also improved.

In the backrest 11 according to the present embodiment, the space between the first back plate member 15 and the second back plate member 16 is closed by the connecting frame 14, but the first back plate member The space between 15 and the second back plate member 16 may be blocked by a member other than the connecting frame 14 that connects the left and right side frames 13.
However, when the space portion between the first back plate member 15 and the second back plate member 16 is closed by the connecting frame 14 as in the present embodiment, the closing portion closes the space portion. The connecting frame 14 serving also as a member cooperates with the left and right side frames 13 to form a robust structure. Therefore, when the configuration according to the present embodiment is employed, the rigidity of the entire backrest 11 can be increased while suppressing an increase in the number of parts.

  Further, in the backrest 11 according to the present embodiment, the connecting frame 14 that also serves as an intermediate member is a support wall that abuts against the back surface in the load input direction of the first back plate member 15 and the second back plate member 16. 24. For this reason, the load inputted from the back of the seated person to the first back plate member 15 and the second back plate member 16 is located not only on the left and right side frames 13 but also on the inner side in the chair width direction from the side frames 13. It can also be received by the support wall 24 arranged. Therefore, when this configuration is adopted, the first back plate member 15 and the second back plate member 16 are not increased in thickness or bent to maintain the strength of the first back plate member 16 while reducing or reducing the thickness. The back load of the seated person input to the back plate member 15 and the second back plate member 16 can be supported with high strength.

In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above-described embodiment, the intermediate member is configured by the connecting frame 14 having both ends connected to the left and right side frames 13, but the intermediate member is not limited to this form, and the chair width You may make it connect with at least one of the 1st back board member 15 and the 2nd back board member 16 while extending right and left from the center part of a direction.
Further, the side sectional shape of the intermediate member disposed between the first back plate member 15 and the second back plate member 16 is directed from the load receiving surface side to the opposite side (from the front portion toward the rear portion). The shape (for example, triangle shape, trapezoid shape, step shape) whose vertical width becomes narrow may be sufficient.
Moreover, in said embodiment, although the backrest is mentioned as an example of the load support member for chairs, the seat may be sufficient as the load support member for chairs which concerns on this invention.

10 Chair 11 Backrest (Load support member for chair)
13 Side frame (frame member)
13-1 1st part 13-2 2nd part 14 Connection frame (intermediate member)
15 First back plate member (first plate member)
15a 1st load receiving surface 16 2nd back board member (2nd board member)
16a Second load receiving surface 23 Widened portion 24 Support wall a-1 Front side a-2 Back side

Claims (6)

A pair of frame members that are spaced apart in the chair width direction and extend in the longitudinal direction intersecting the load input direction;
A first plate member that is constructed between the first portions of the pair of frame members and has a first load receiving surface that receives a load of a seated person;
A second plate member that is provided between the second portions of the pair of frame members that are spaced apart from each other in the longitudinal direction and that has a second load receiving surface that receives the load of the seated person; ,
An intermediate member disposed in a space between the first plate member and the second plate member, the surface of which is located between the first load receiving surface and the second load receiving surface; With
The first plate member and the second plate member are arranged between a pair of the frame members so that the end portions in the chair width direction are directed in different directions in a side view of the chair. A load for a chair, characterized in that an overall load receiving surface having a bent shape or a curved shape in a side view is constituted by the load receiving surface of the second load receiving surface, the second load receiving surface, and the surface of the intermediate member. Support member.   The second portion of each frame member has a widened portion whose width in the load input direction from the seated person is wider than the width in the load input direction of the end portion closer to the first portion. The load support member for a chair according to claim 1. The near side in the load input direction of the second part is formed in a straight line so as to be continuous with the near side in the load input direction of the first part,
The back side of the second part in the load input direction is inclined with respect to the front side of the second part so that the width in the load input direction gradually increases as the distance from the first part increases. The load supporting member for a chair according to claim 2, wherein:   The chair support member according to any one of claims 1 to 3, wherein the intermediate member is a connecting frame that connects a pair of the frame members.   The said intermediate member has a support wall contact | abutted to the surface of the load input direction back | inner side of at least one of the said 1st board member and the said 2nd board member of Claims 1-4. The load supporting member for chairs of any one of Claims.   The chair provided with the load supporting member for chairs of any one of Claims 1-5.

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