JP6344847B2 - Chair load support and chair - Google Patents

Description

  The present invention relates to a load support for a chair and a chair.

  In a chair used for office work or the like, a seat that supports a seated person's buttocks and a backrest that supports the back of the seated person are attached to the upper part of the pedestal. The backrest, which is a load support body, is required to be able to support the load on the back of the seated person with high rigidity, to have a flexible contact feeling and to hold on the back of the seated person. Chair backrests that meet such requirements have been conventionally devised (see, for example, Patent Documents 1 to 3).

  In the backrest of the chair described in Patent Document 1, a synthetic resin backboard is attached to a highly rigid backrest frame, and a plurality of mesh-like openings are provided on the backboard. In the case of this backrest, the support frame is secured by the backrest frame, and the back plate supported by the backrest frame can be easily stretched and deformed by a mesh-like opening, thereby providing a flexible contact feeling and holdability. I try to get it.

  However, since the backrest of the chair described in Patent Document 1 has a structure including a backrest frame and a backboard that is a separate part from the backrest frame, the number of parts is large and assembly work is difficult. Easy to get complicated.

  The backrest of the chairs described in Patent Documents 2 and 3 increases the number of parts by providing a high-strength frame portion and a load receiving portion that can be flexibly deformed on a synthetic resin load support plate. The problem to be solved is solved.

  Specifically, in the backrest described in Patent Documents 2 and 3, the inside is reinforced by ribs or the like on the left and right side edges, the upper side, and the lower side of a substantially rectangular load support plate made of synthetic resin. A thick frame portion is formed, and a thin load receiving portion is formed in an inner region of the frame portion, and a plurality of elongated holes that are long in the vertical direction are formed in almost the entire area of the load receiving portion. ing. In the case of this backrest, the support rigidity is ensured by a thick frame portion, and a flexible contact feeling and holdability can be obtained by a thin load receiving portion having a plurality of openings.

Japanese Patent No. 3895084 Japanese Patent No. 4295266 Japanese Patent No. 5276304

  As for the backrest of the chairs described in Patent Documents 2 and 3, if the central region in the width direction can be flexibly deformed to the rear side, it is possible to secure a flexible contact feeling and holdability of the back of the seated person. However, since the backrest described in Patent Documents 2 and 3 is actually formed with a thick frame portion on the upper side and the lower side of the load receiving portion, the upper and lower portions of the load receiving portion are The flexible deformation of the load receiving portion is likely to be hindered by the frame portion at the end portion, particularly at the upper end portion that receives a large load from the back of the seated person. For this reason, in the backrest described in Patent Documents 2 and 3, it is desired to further improve the flexible contact feeling and holdability.

  Therefore, the present invention is intended to provide a load support body for a chair and a chair capable of obtaining a high support rigidity and a more flexible deformation at a load receiving portion without increasing the number of parts.

In order to solve the above problems, a load support body for a chair according to one invention of this application is integrally formed with a plate-like load receiving portion that receives a load of a seated person and a pair of opposite sides of the load receiving portion. A pair of side edge support portions that are formed and function as strength members, and the load receiving portion is formed with a plurality of openings for facilitating deformation of the load receiving portion. In the body, at least one end side of the load receiving portion along the extending direction of the side edge support portion is curved toward the opposite load receiving side opposite to the load receiving side receiving the load from the seated person. The opening formed in the vicinity of the curved portion of the load receiving portion is a long hole-like opening substantially along the extending direction of the side edge support portion, and the long hole-shaped opening is It is formed in a range extending over at least the curved portion receives the load And the load receiving side surface of the side edge support part is formed by a continuous surface, and the anti-load receiving side surface of the load receiving part is opposite to the anti-load receiving side surface of the side edge support part. Thus, it is formed to be offset stepwise on the load receiving side.

  Accordingly, high support rigidity is ensured by the pair of side edge support portions, and the load receiving portion between the pair of side edge support portions can obtain a flexible deformation at the contact portion with the seated person by the plurality of openings. . In particular, a curved portion is provided on at least one end side of the load receiving portion along the extending direction of the side edge support portion, and at least approximately in the extending direction of the side edge support portion in a range straddling the curved portion. Since the elongated hole-shaped opening is provided, it is deformed flexibly in the load receiving direction without receiving a large restraining force in the vicinity of the curved portion. Accordingly, the entire area of the load receiving portion is easily deformed flexibly following the deformation of the load receiving portion in the region separated from the curved portion.

Further, in this case, the load receiving portion and the load receiving side surface of the side edge support portion are formed by a continuous surface, so that the load receiving portion can be efficiently deformed without giving a sense of discomfort to the seated person. . Also, the seated person's load is input as a load in the compression direction from the load receiving portion to the end portion on the load receiving side of the side edge support portion. For this reason, unlike the case where the surface of the load receiving portion on the side opposite to the load receiving side is connected to the surface of the side edge support portion on the side opposite to the load receiving side, the load receiving portion is pulled to the connecting portion of the load receiving portion and the side edge supporting portion. The load becomes difficult to concentrate, and the load receiving portion is easily deformed flexibly in a wider range.

It is preferable that the thickness of the side edge support portion in the load receiving direction is thicker than the thickness of the load receiving portion in the load receiving direction.
In this case, the load input from the load receiving portion to the side edge support portion can be supported with higher rigidity by the side edge support portion.

Of the load receiving portions, the other end side along the extending direction of the side edge support portion is provided with an edge support portion functioning as a strength member, and both end portions of the edge support portion in the extending direction. May be integrally connected to the pair of side edge support portions, and the curved portion may be formed on one end side of the load receiving portion along the extending direction of the side edge support portions.
In this case, even when the bending deformation amount on the curved portion side is set to be large, the rigidity of the remaining three sides of the load receiving portion is maintained sufficiently high by the pair of side edge support portions and the edge support portions. be able to.

A chair load support according to another invention of this application is formed integrally with a plate-shaped load receiving portion that receives a load of a seated person and a pair of opposite sides of the load receiving portion, and functions as a strength member. A load support body of a chair provided with a plurality of openings for facilitating deformation of the load receiving portion. Of these, at least one end side along the extending direction of the side edge support portion is provided with a curved portion that curves toward the opposite load receiving side opposite to the load receiving side receiving the load from the seated person, The opening formed in the vicinity of the curved portion of the portion is a long hole-like opening substantially along the extending direction of the side edge support portion, and the long hole-shaped opening is at least in a range straddling the curved portion. is formed, the curved portion, the end portion of the extending direction 90 ° Curved so that the change angle to obtain, the elongated hole-like opening, said one of the curved portion is formed so as to extend to the extreme end position along the extending direction of the side edge support portion, said side edge A plate-like front-side support wall facing the load-receiving side and a plate-like back-side support wall facing the anti-load-receiving side are at the side edges at least on the edge where the curved portion is located. A cylindrical structure is connected in a ring shape in the extending direction of the edge support portion, and the surface side support wall is formed to have substantially the same thickness as the load receiving portion.
In this case, since the long hole-like opening is formed so as to straddle the endmost position of the curved portion, the bending deformation of the load receiving portion is not easily restrained even in the vicinity of the endmost position. Accordingly, it is possible to obtain a more flexible deformation of the load receiving portion, and it is possible to flexibly deform the bending portion even when a load is directly input from the seated person to the surface of the bending portion.

In this case, at least the end edge of the load receiving portion on the side where the curved portion is located is supported by the cylindrical structure having the front surface side support wall and the back surface side support wall. For this reason, it becomes possible to obtain high support rigidity at the side edge support portion without causing an increase in weight. In addition, since the surface-side support wall is formed with substantially the same thickness as the load receiving portion, bending deformation is less likely to be constrained in the portion of the load receiving portion adjacent to the surface-side support wall. Furthermore, since a hollow part is provided between the front-side support wall and the back-side support wall, the back-side support wall can be gripped as a handle when the chair is moved.
The load receiving portion and the load receiving side surface of the side edge support portion are formed by a continuous surface, and the anti load receiving side surface of the load receiving portion is the anti load receiving side of the side edge support portion. It may be formed so as to be offset in a stepped manner on the load receiving side with respect to the surface.

One connection part of the front surface side support wall and the back surface side support wall may be formed in a curved shape, and the connection part may be connected so as to be continuous with a side edge of the curved part.
In this case, the side edge portion of the curved portion is supported by the connection portion on one end side of the front surface side support wall and the back surface side support wall. Therefore, the deformation behavior of the bending portion when the bending portion receives a load from the seated person can be stabilized.

  In the chair according to the present invention, any one of the load supports described above is supported by a support structure having legs.

  The load support may be a backrest that is supported by the support structure such that the curved portion curves backward on the upper end side.

  According to this invention, a curved portion is provided on at least one end side of the load receiving portion along the extending direction of the side edge support portion, and the side edge support portion extends at least in a range straddling the curved portion. Since a long hole-like opening that is substantially along the direction is provided, it is possible to obtain a high support rigidity by the side edge support portion and a flexible deformation near the curved portion, while the structure does not increase the number of parts. it can.

It is a front view of the chair which concerns on 1st Embodiment of this invention. It is a side view of the chair which concerns on 1st Embodiment of this invention. It is a partial section side view of the state where the seat of the chair concerning a 1st embodiment of this invention was flipped up. It is a rear view of the chair which concerns on 1st Embodiment of this invention. It is a top view of the chair which concerns on 1st Embodiment of this invention. It is a rear view of the chair which concerns on 2nd Embodiment of this invention. It is a perspective view of the chair which concerns on 3rd Embodiment of this invention. It is a perspective view of the chair which concerns on 3rd Embodiment of this invention. It is a front view of the load receiving plate of the modification of embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person seated in a normal posture on the chair is called “left”, and the direction opposite to that is called “right”.

FIG. 1 is a front view of the chair 1 according to the first embodiment, and FIG. 2 is a right side view of the chair 1. 3 is a partial cross-sectional side view of the chair 1 in a state in which the seat 20 is flipped up, FIG. 4 is a rear view of the chair 1, and FIG. 5 is a top view of the chair 1.
As shown in these drawings, the chair 1 according to the first embodiment is arranged on a leg 10 placed on the floor, a seat 20 that supports a seated person's buttocks, and a rear side of the seat 20. And a backrest 30 that supports the back of the seated person. As will be described in detail later, the seat 20 can be turned up and turned around the rear side as a fulcrum.

(leg)
The leg portion 10 is integrally provided with leg frames 11, 11 configured as a pair of left and right and a front frame 12 that couples the left and right leg frames 11, 11 together. The leg frames 11, 11 and the front frame 12 are formed of a metal pipe material.

Each of the left and right leg frames 11 includes a front column portion 13 that stands while tilting backward from the lower end, a rear column portion 14 that stands while tilting forward from the lower end, and an upper end portion and a rear column of the front column portion 13. And a connecting support column portion 15 that connects a midway portion in the extending direction of the portion 14. A caster 16 is mounted at each lower end of the front column 13 and the rear column 14 so as to be able to roll on the floor surface. The connecting support column 15 is gently inclined obliquely upward from the connecting position with the front support column 13 on the front end side toward the connecting position with the rear support column 14 on the rear end side.
Further, the upper region also constitutes an attachment base 18 to which the backrest 30 is attached, depending on the connection position of the rear support column 14 with the connection support column 15.

  The front frame 12 extends substantially horizontally in the left-right direction, and both ends thereof are connected to the upper end portions of the front strut portions 13 of the left and right leg frames 11, 11. The left and right leg frames 11, 11 restrict the opening in the left-right direction on the front side when the seated person's load is applied. Further, when the seat 20 is rotated to a substantially horizontal posture, the front frame 12 receives the load of the seat 20 by contacting the lower surface of the front edge portion of the seat 20. The left-right opening on the rear side of the left and right leg frames 11, 11 is regulated by the backrest 30 by connecting the left and right rear struts 14, 14 (mounting bases 18, 18) to the backrest 30. ing.

  Further, the left and right mounting bases 18 and 18 of the leg portion 10 are connected to the left and right ends of the backrest 18 and are connected to the left and right ends of the backrest 18 and the seat 20 is extended to the lower side of the front portion. And a support arm portion 18a rotatably connected to the rear edge portion.

(seat)
As shown in FIG. 3, the seat 20 includes a seat frame 21 made of a metal pipe material, a lower cover 22 that covers the lower surface of the seat frame 21, and a seat surface member 23 that covers the top of the seat frame 21. doing. The seat 20 is formed in a substantially rectangular shape when viewed from above, and is extended with connecting arms 25 that are rotatably connected to the support arm portions 18a of the left and right mounting bases 18 at the left and right edges on the rear end side. ing. The seat 20 is flipped upward with the left and right support arm portions 18a as fulcrums as shown in FIG. 3, and the forward tilt posture as shown in FIG. And can be switched as appropriate.

(Backrest)
In this embodiment, the backrest 30 constitutes a load support for the chair. Moreover, the leg part 10 and the seat 20 mentioned above comprise the support structure in this embodiment.
The backrest 30 is integrally formed of synthetic resin as a whole. The backrest 30 is a pair of a substantially rectangular plate-like back plate portion 31 (load receiving portion) that receives the load of the seated person's back, and a pair of left and right sides of the back plate portion 31 that function as strength members. The side edge support part 32 and the edge support part 33 which are integrally formed on the lower side of the back plate part 31 and function as a strength member in the same manner as the side edge support part 32 are provided. The side edge support portion 32 in this embodiment extends substantially along the vertical direction while being slightly inclined toward the rear upper side when attached to the leg portion 10.

  The back plate portion 31 is formed in a substantially rectangular shape when viewed from the front. To be precise, the left and right sides are formed in straight lines parallel to each other, and the upper side is a straight line with a gentle arc. The lower side is formed in a substantially arc shape that protrudes downward.

The entire back plate portion 31 is formed to have a substantially constant thickness, and a plurality of openings 34 for facilitating deformation of the back plate portion 31 are formed in almost the entire area thereof. In the case of this embodiment, most of the openings 34 have a long hole shape along the substantially vertical direction (along the extending direction of the side edge support portion 32). Since most of the entire opening 34 is a long hole-like opening along the substantially vertical direction, when a load is input to the front side (load receiving side) of the back plate 31, The central region in the width direction is easily bent concavely toward the rear.
Note that the plurality of openings 34 of this embodiment are arranged in a straight line in the vertical direction or in a substantially curved shape that is slightly curved, and a plurality of rows arranged in the vertical direction are provided in the width direction. The openings 34 in rows adjacent to each other in the width direction are arranged so as to be staggered in the vertical direction. In the case of this embodiment, the opening 34 of the back plate portion 31 is formed in an elongated hole shape that is long in the substantially vertical direction, and the opening 34 easily spreads in the width direction due to an input load from the front side. Since the openings 34 adjacent to each other are not hindered from expanding in the width direction, it is possible to easily obtain a more flexible deformation of the back plate 31. it can.

  In addition, the back plate portion 31 is formed in a curved shape in which the central region in the width direction gently concaves in the rear side, and on the upper end side (one end side along the extending direction of the side edge support portion 32), A bending portion 35 that extends toward the substantially horizontal position toward the rear side (the anti-load receiving side) is extended. The opening 34 described above is formed at least in a range straddling the curved portion 35. In the case of this embodiment, the opening 34 provided in the bending portion 35 has a longer vertical extension than the opening 34 formed in the central region in the vertical direction of the back plate portion 31 and is curved. It is formed so as to reach the vicinity of the terminal of the portion 35.

In the case of this embodiment, as shown in FIG. 5, the adjacent pitch P1 in the center region in the width direction is adjacent pitch P2 in the end regions on both sides, as shown in FIG. It is set narrower than.
Therefore, in the case of this embodiment, the adjacent pitch P1 of the openings 34 in the central region in the width direction of the curved portion 35 is narrowed, so the openings 34 occupy a certain area in the central region in the width direction of the curved portion 35. The proportion increases. For this reason, the deformation amount in the central region in the width direction of the bending portion 35 can be increased more than the deformation amounts in the end regions on both sides. As a result, the seating feeling and the holdability of the backrest 31 can be further enhanced.

  The side edge support portions 32 on both the left and right sides of the back plate portion 31 are formed in a substantially tapered cylindrical shape that gradually tapers upward from a lower end portion that is fitted to a connection support portion (not shown) of the mounting base 18. Has been. The thickness (diameter) in the front-rear direction of the side edge support portion 32 is set to be sufficiently thicker than the thickness of the back plate portion 31 as a whole. Further, the upper edge portion of the side edge support portion 32 is gently curved toward the upper end side toward the rear side, and the curved region gradually approaches the side edge of the curved portion 35 of the back plate portion 31. While connected.

  Further, the edge support portion 33 on the lower side of the back plate portion 31 is formed in a substantially right triangle cross-sectional shape in which the right angle portion is located at the lower end on the front surface side, and both end portions of the left and right side edge support portions 32 are formed. It is connected to the bottom side. The thickness in the front-rear direction of the edge support portion 33 is set to be thicker than the thickness of the back plate portion 31 like the side edge support portion 32.

  Here, the front surface (the surface on the load receiving side) of the back plate portion 31, the left and right side edge support portions 32, and the lower edge support portion 33 is formed by a smoothly continuous surface having almost no step, The rear surface of the back plate portion 31 (the surface on the side opposite to the load receiving side) has a stepped shape on the front side (the surface on the side opposite to the load receiving side) with respect to the rear surface (the surface on the side opposite to the load receiving side) of the side edge support portion 32 and the edge support portion 33. It is formed so as to be offset.

  The chair 1 according to this embodiment is used in a state where the seat 20 is tilted substantially horizontally forward with the left and right support arm portions 18a as fulcrums and the front lower surface of the seat 20 is supported by the front frame 12. In this state, when the seated person sits on the seat 20 and leans his back on the backrest 30, the backboard part 31 of the backrest 30 receives the load of the seated person on the front side, and a plurality of vertically long openings in the backboard part 31 When 34 is pushed open in the left-right direction, the central region in the width direction of the back plate portion 31 is bent and deformed in a concave shape on the rear side.

  At this time, the left and right sides of the back plate portion 31 of the backrest 30 are supported by the left and right mounting bases 18 and 18 of the leg portion 10 through the highly rigid side edge support portions 32, and the lower sides are similarly It is supported by the left and right mounting bases 18 and 18 via the lower end of the rigid edge support 33 and the left and right side edge supports 32. Therefore, the load input to the backrest 30 from the back of the seated person is supported by the leg 10 with high rigidity.

  Further, in the chair 1 according to this embodiment, a curved portion 35 that curves toward the rear side is provided on the upper end side of the back plate portion 31 of the backrest 30, and a vertically long slot is provided at least in a range straddling the curved portion 35. Since the opening 34 is formed, when a load is input from the back of the seated person to the rear side on the upper end of the back plate 31, the seated person is not subjected to a large restraining force near the curved portion 35. Can be flexibly deformed. That is, the extended end side of the curved portion 35 is continuous without being separated in the width direction, but at least in the vicinity of the proximal end portion of the curved portion 35 continuous with the general surface of the front surface of the back plate portion 31 is vertically long. Therefore, the restraint at the extended end of the curved portion 35 can be minimized, and the bending deformation of the upper front portion of the back plate portion 31 can be greatly allowed.

More specifically, in the case of the embodiment, since the long hole-shaped opening 34 is formed in the curved portion 35 that curves toward the rear side, the load acting on the general surface of the back plate portion 31 from the back of the seated person. Rather than trying to widen the individual openings 34 in the width direction, it acts as a force that curves the front side of the entire bending portion 35 backward in plan view. Further, at this time, since each opening 34 of the bending portion 35 extends in the longitudinal direction toward the rear side, only a part of the bending portion 35 is not greatly deformed, and the wide range of the bending portion 35 is widened. The side edge portions of the plurality of openings 34 are gradually bent and deformed by the length of the side edge portion of each opening 34. Therefore, when a load acts on the general surface of the back plate portion 31 from the back of the seated person, the restraint on the upper end side of the back plate portion 31 is reduced and the general surface of the back plate portion 31 is more flexible. Can be obtained.
Therefore, the backrest 30 of the chair 1 can have a high support rigidity by the side edge support portion 32 and a flexible deformation in the vicinity of the upper end portion, even though the backrest 30 has a structure formed of an integrally molded part.

In addition, in the case of the backrest 30 of the chair 1 according to this embodiment, the front side is formed by a smoothly continuous surface with almost no step, so that the seated person who can lean the back on the backrest 30 does not feel uncomfortable. The back plate portion 31 can be efficiently bent and deformed.
On the other hand, in the case of the backrest 30, on the rear surface side, the rear surface of the back plate portion 31 is formed so as to be offset stepwise toward the front side with respect to the rear surfaces of the side edge support portion 32 and the edge support portion 33. Therefore, the load when the seated person leans back is input as a load in the compression direction from the back plate portion 31 to the front end portions of the left and right side edge support portions 32. Therefore, in the backrest 30, when the load on the back of the seated person acts on the back plate portion 31, the rear surface of the back plate portion 31 is biased toward the rear surface side of the side edge support portion 32 and the edge support portion 33. Unlike the case where the back plate portion 31 and the side edge support portion 32 are connected to each other, unlike the case where the back plate portion 31 and the side edge support portion 32 are connected, the back load portion 31 can be flexibly deformed in a wider range.

  Furthermore, in the backrest 30 according to this embodiment, the thickness in the front-rear direction of the left and right side edge support portions 32 is thicker than the thickness in the front-rear direction of the back plate portion 31, and thus the back plate portion 31. Thus, the load input to the left and right side edge support portions 32 can be supported by the side edge support portions 32 with higher rigidity.

  Further, the backrest 30 according to this embodiment is provided with an edge support portion 33 that functions as a strength member extending in the width direction on the lower side of the back plate portion 31, and both end portions of the edge support portion 33 are left and right. Since the upper and lower side edge support portions 32 are connected to the lower end of the back edge 31, the remaining three sides of the periphery of the back plate 31 can be rigidly supported on the left and right side edge support even when the amount of bending deformation on the upper end curved portion side is set large. The portion 32 and the lower edge support portion 33 can be sufficiently secured.

FIG. 6 is a diagram illustrating a back surface of the chair 101 according to the second embodiment. In the description of each embodiment described below, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
The chair 101 according to the second embodiment has the same basic configuration as the first embodiment except for the backrest 130. The backrest 130 is a substantially rectangular plate-like back plate portion 31 that receives the load on the back of the seated person, and a pair of side edge support portions that are integrally formed on the left and right sides of the back plate portion 31 and function as strength members. 32, but no edge support portion (33) that functions as a strength member is formed on the lower side of the back plate portion 31.

  Therefore, in the backrest 130 according to the second embodiment, not only the upper end side of the back plate portion 31 but also the bending deformation on the lower end side can be increased.

  In the second embodiment described here, the lower end side of the back plate portion 31 is not provided with a bending portion that curves toward the back portion side, but the lower end side is also bent similarly to the upper end side of the back plate portion 31. A vertically long opening may be formed in a range straddling the curved portion on the lower end side. In this case, the upper and lower sides of the back plate portion 31 are less likely to be restrained from being bent and deformed, and the back plate portion 31 can be deformed more flexibly by receiving a load from the back of the seated person.

Next, a third embodiment shown in FIGS. 7 and 8 will be described.
FIG. 7 is a perspective view of the chair 201 according to the third embodiment as viewed from the upper right side, and FIG. 8 is a perspective view of the chair 201 as viewed from the upper back.
The chair 201 according to this embodiment has the same basic configuration as the first embodiment except for the backrest 230. The backrest 230 is integrally formed of a synthetic resin as a whole. The backrest 230 is integrally formed on the substantially rectangular back plate portion 231 (load receiving portion) and the left and right sides of the back plate portion 231 as a strength member. And a pair of functioning side edge support portions 232 and 232.

  The entire back plate portion 231 is formed to have a substantially constant thickness, and a plurality of openings 34 for facilitating deformation of the back plate portion 231 are formed in almost the entire area. The opening 34 in this embodiment is also formed in a long hole shape that is long in a substantially vertical direction (extending direction of the side edge support portion 232). The plurality of openings 34 are arranged in a straight line in the vertical direction, and a plurality of rows arranged in the vertical direction are provided in the width direction, and the openings 34 in rows adjacent to the width direction are shifted in a staggered manner in the vertical direction. Has been placed.

  In addition, the back plate portion 231 is formed in a curved shape in which the central region in the width direction is gently recessed toward the rear side, and a curved portion 235 that curves toward the rear side (counter load receiving side) on the upper end side. It is extended. However, the curved portion 235 of this embodiment is formed so that the extending end faces downwardly beyond a substantially horizontal posture. That is, the end portion of the bending portion 235 in the extending direction is bent so as to have a change angle exceeding 90 °. The plurality of long hole-shaped openings 34 described above are formed so as to straddle the curved portion 235, but the end of the long hole-shaped opening 34 extends to a position near the extending end of the curved portion 235, that is, Further, it extends beyond the top (extended end position) of the curved portion 235 to a position slightly bent downward at the rear. Therefore, the long hole-shaped opening 34 extends so as to cross the top of the curved portion 235 in the front-rear direction.

The side edge support portions 232 on both the left and right sides of the back plate portion 231 are formed in a prismatic shape from the lower end portion to a substantially central position in the vertical direction, and the upper portion of the prismatic portion 40 faces the front side (load receiving side). A substantially elliptical cylindrical portion 43 (cylindrical structure) in which a plate-like front-side support wall 41 and a plate-like back-side support wall 42 facing the rear side are connected to each other at the upper and lower ends is connected. The connection portion 44 on the upper end side that connects the front-side support wall 41 and the back-side support wall 42 is formed in a curved shape having an arc shape in side view. Although the front surface side support wall 41 is formed in a substantially flat plate shape, the back surface side support wall 42 is not formed in a flat plate shape, but is formed in a curved shape that is slightly convexly curved rearward in a side view. A hollow portion 45 is provided between the front-side support wall 41 and the back-side support wall 42, and the back-side support wall 42 can be gripped as a handle by inserting a finger into the hollow portion 45. It has become.
In this embodiment, the front-side support wall 41 is formed with substantially the same thickness as the back plate portion 231.

  Further, the back plate portion 231 is formed to be thinner in the front-rear direction than the left and right side edge support portions 232, and is connected so that both side portions are flush with the surface of the left and right side edge support portions 232. ing. In particular, both side portions of the substantially upper half portion of the back plate portion 231 are connected to the surface-side support wall 41 of the tubular portion 43 so as to continue with substantially the same thickness. Then, both side portions of the bending portion 235 extending on the upper portion of the back plate portion 231 are connected to the curved connection portion 44 on the upper portion of the tubular portion 43. Both side portions of the curved portion 235 are also connected to the connecting portion 44 of the cylindrical portion 43 so as to continue with substantially the same thickness.

  The backrest 230 of the chair 201 according to the third embodiment has the same basic configuration as that of the first embodiment, and thus can obtain substantially the same effect as that of the first embodiment. The following effects can be further obtained by this unique configuration.

  The backrest 230 according to this embodiment is formed such that the extending end side of the curved portion 235 of the back plate portion 231 is curved so as to face downward beyond a substantially horizontal posture, and a plurality of elongated holes 34 are formed in the backrest 230. Since it is formed along the front-rear direction so as to straddle the top of the bending portion 235, the bending deformation of the back plate portion 231 when a load is input from the back of the seated person is also restrained in the vicinity of the top of the bending portion 235. It becomes difficult. Therefore, in the backrest 230 of this embodiment, a more flexible deformation of the back plate portion 231 can be obtained, and even when a load is directly input from a seated person near the top of the bending portion 235, the bending portion 235 can be flexibly deformed.

  Further, in the backrest 230 according to this embodiment, the front side support wall 41 and the back side support wall 42 are annularly connected to the upper edge of the side edge support part 232 at the upper and lower ends, and the cylindrical part 43. Since the (tubular structure) is configured, high support rigidity of the upper edge part of the side edge support part 232, particularly high support rigidity in the front-rear direction, can be obtained without causing an increase in weight.

  Furthermore, in the case of the backrest 230 according to this embodiment, since the thickness of the front-side support wall 41 is formed to be substantially the same as that of the adjacent back-plate portion 231, the back-plate portion 231 is connected to the front-side support wall 41. The deformation is less likely to be constrained at the adjacent portion. Therefore, in the case of the backrest 230 of this embodiment, a more flexible deformation of the back plate portion 231 can be obtained.

  Further, in the backrest 230 of this embodiment, the cylindrical portion 43 is provided on the side edge support portion 232, and the hollow portion 45 is formed on the front side of the back side support wall 42 of the cylindrical portion 43. There is an advantage that when the chair 201 is moved, a person can easily grasp the back side support wall 42 as a handle by inserting his / her finger into the hollow portion 45.

  Further, in the backrest 230 of this embodiment, the connection portion 44 on the upper end side of the side edge support portion 232 is formed in a curved shape, and the connection portion 44 is a side edge of the curved portion 235 on the upper side of the back plate portion 231. Therefore, the side edge of the bending portion 235 can be supported by the connection portion 44 on the upper side of the side edge support portion 232 that functions as a strength member. Therefore, in the case of the backrest 230 of this embodiment, the deformation behavior of the bending portion 235 when the bending portion 235 receives a load from the back of the seated person can be stabilized.

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 each of the above embodiments, the backrest constitutes the load support of the chair, but the load support is not limited to the backrest and may be a seat.
In addition, the openings formed in the back plate portion of the backrest are all formed by a long hole-like opening that is long in the vertical direction in each of the above-described embodiments. For example, the opening is long as in the modification shown in FIG. You may make it form in a backplate part in the form where the hole-shaped opening 34 and the opening 34a which is not long hole shape, such as circular shape, coexist.

1,101,201 Chair 30,130,230 Backrest (load support)
31,231 Back plate (load receiving part)
32,232 Side edge support portion 33 Edge support portion 34 Opening 35,235 Curved portion 41 Front side support wall 42 Back side support wall 44 Connection portion

Claims (8)

A plate-like load receiving portion that receives the load of the seated person,
A pair of side edge support portions formed integrally with a pair of opposite sides of the load receiving portion and functioning as a strength member,
In the load support of the chair in which a plurality of openings for facilitating the deformation of the load receiver are formed in the load receiver,
A curved portion that curves toward an opposite load receiving side opposite to the load receiving side that receives a load from a seated person extends at least one end side of the load receiving portion along the extending direction of the side edge support portion. And
The opening formed in the vicinity of the curved portion of the load receiving portion is an elongated hole-shaped opening substantially along the extending direction of the side edge support portion,
The elongated hole-shaped opening is formed in a range straddling at least the curved portion ,
The load receiving part and the side of the side edge support part on the load receiving side are formed by a continuous surface,
The surface of the load receiving portion on the side opposite to the load receiving portion is formed to be offset in a stepped manner on the load receiving side with respect to the surface of the side edge support portion on the side opposite to the load receiving portion. Chair load support. 2. The chair load support according to claim 1 , wherein a thickness of the side edge support portion in a load receiving direction is greater than a thickness of the load receiving portion in the load receiving direction . Of the load receiving portions, the other end side along the extending direction of the side edge support portion is provided with an edge support portion functioning as a strength member, and both end portions of the edge support portion in the extending direction. Is integrally connected to the pair of side edge support portions,
The load support body for a chair according to claim 1 or 2 , wherein the curved portion is formed on one end side of the load receiving portion along the extending direction of the side edge support portion . A plate-like load receiving portion that receives the load of the seated person,
A pair of side edge support portions formed integrally with a pair of opposite sides of the load receiving portion and functioning as a strength member,
In the load support of the chair in which a plurality of openings for facilitating the deformation of the load receiver are formed in the load receiver,
A curved portion that curves toward an opposite load receiving side opposite to the load receiving side that receives a load from a seated person extends at least one end side of the load receiving portion along the extending direction of the side edge support portion. And
The opening formed in the vicinity of the curved portion of the load receiving portion is an elongated hole-shaped opening substantially along the extending direction of the side edge support portion,
The elongated hole-shaped opening is formed in a range straddling at least the curved portion,
The curved portion is curved so that the end in the extending direction has a change angle exceeding 90 °,
The elongated hole-shaped opening is formed so as to straddle the endmost position of the curved portion along the extending direction of the side edge support portion,
A plate-like front-side support wall facing the load-receiving side and a plate-like back-side support wall facing the anti-load-receiving side at least on an edge of the side edge support portion on the side where the curved portion is located Is a cylindrical structure that is annularly connected in the extending direction of the side edge support portion,
The load support body for a chair, wherein the surface-side support wall is formed to have substantially the same thickness as the load receiving portion . The load receiving part and the side of the side edge support part on the load receiving side are formed by a continuous surface,
The surface of the load receiving portion on the side opposite to the load receiving portion is formed to be offset in a stepped manner on the load receiving side with respect to the surface of the side edge support portion on the side opposite to the load receiving portion. The load support body of the chair of Claim 4 . The connection portion on one end side of the front surface side support wall and the back surface side support wall is formed in a curved shape, and the connection portion is connected so as to be continuous with a side edge of the curved portion. The load support of the chair according to 4 or 5 . The load support body of any one of Claims 1-6 is supported by the support structure which has a leg part, The chair characterized by the above-mentioned. The chair according to claim 7, wherein the load support is a backrest that is supported by the support structure so that the bending portion curves backward on the upper end side.

Images