JP6414964B2 - Chair load bearing member and chair - Google Patents

Description

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

  2. Description of the Related Art Conventionally, a chair including a chair-shaped load support member formed by covering a frame member with a bag-like tension member that opens downward and having the chair load support member as a backrest is known (for example, Patent Document 1, Patent Document 2). In the chairs disclosed in Patent Literature 1 and Patent Literature 2, the tension material forming the front side surface and the back side surface of the chair is opened downward by joining at a portion other than the lower end portion. A bag-like tension member is formed, and the bag-like tension member is covered with a frame member, whereby a backrest as a load supporting member is formed.

  In such a chair, since the upholstery is formed in a bag shape and covered on the frame member, the number of assembling steps of the load support member is reduced and efficient assembly is possible. In addition, since the tension member having a predetermined tension is arranged on the back side opposite to the front side where the seated person directly applies a load, the tension of the entire tension material can be increased, Therefore, the seated person's body can be supported more strongly.

  By the way, when covering the frame member with the bag-like tension member, it is necessary to greatly stretch the tension member in the width direction of the frame member. The larger the amount of stretching at this time, the greater the tension that can be generated, but the greater the work. In particular, in the chair disclosed in Patent Document 1, this tendency is strong because the side edge portions of the front and back tension members are joined to the lower end portion.

  In order to solve such a problem, like the chair disclosed in Patent Document 2, the lower end portion of the front and back tension members is set to a free end (with the joining range of the tension material side edge portion slightly above the lower end portion). It is desirable that the lower opening is continuous to the side and partly opened to the side so that the opening can be easily expanded when the tension member is placed on the frame member.

JP 2009-112396 A JP 2011-083518 A

  In this way, when the bag-like tension member is formed by opening the lower opening to the side, when the tension member is put on the frame member, the tension member always generates tension in this state. However, this tension acts as a force that tries to tear off the joining state between the front side surface and the back side surface at the lower end portion of the joining portion, and particularly with the front side surface in the side opening. It acts to tear the surface on the back side. As a result, for example, long-term use may cause damage such as tearing between the front side surface and the back side surface.

  The present invention has been made in view of the above circumstances, and facilitates covering the frame member with a bag-like tension member, and prevents breakage of the joint portion between the front side surface and the rear side surface constituting the tension member. An object is to provide a load supporting member for a chair and a chair provided with the same.

  The load support member for a chair according to the present invention is a load support member for a chair provided in a chair, and includes a frame member provided with a pair of eaves members spaced apart in parallel in the width direction of the chair, and the chair The front side tension material arranged on the load receiving surface side and the back side tension material arranged on the opposite side of the load receiving surface are one end edge in the length direction of the saddle material and both side edge edges in the width direction. And is formed in a bag shape having an opening continuous in the width direction on the other end edge side in the length direction, and through the opening to the frame member in the length direction of the frame member An end portion on the other end edge side of the joining portion at both side end edges of the front-side tension member and the back-side tension member in the tension member. By being positioned closer to the edge than the edge, the The mouth portion is formed to have a side opening that opens to the other end edge side of both side edges of the upholstery material, and the side opening of the front side upholstery material that forms the side opening. A connecting plate for connecting the other end edge side and the other end edge side of the backside tension member is provided, and the connecting plate is bent so that the one end edge side is convex and the other end edge side is concave. In this way, it is connected to the other end edge side of the front side tension member on one side across the bent portion, and is connected to the other end edge side of the back side tension member on the other side across the bent portion. .

  According to this chair load support member, the opening of the upholstery material on the other end edge side in the length direction of the eaves has a side opening that opens on the other end edge side of both side edges of the upholstery material. Therefore, it is easy to perform the work when covering the tension member on the frame member. Moreover, since the connecting plate that connects the other end edge side of the front side tension member and the other end edge side of the back side tension member is provided in the side opening, the tension generated by the tension member is different from that of the front side tension member in the side opening. Even if it acts so as to peel off the joint portion with the backside tension member, the joint plate resists this peeling force, thereby preventing the joint portion from being damaged. Further, the connecting plate is bent so that one end edge side is convex and the other end edge side is concave, so that the connecting plate is connected to the front side tension material on one side and connected to the back side tension material on the other side. Therefore, the side opening is easy to open because the bent part tries to return to the original flat plate shape, and it is easy to maintain the open shape, so the workability when covering the tension member on the frame member is improved It will not be damaged.

Further, in the load support member for a chair, the length of one side of the connecting plate sandwiching the bent portion is such that the other end edge of the front side tension member from the end portion on the other end edge side of the joining portion. The length of the other side of the connecting plate that sandwiches the bent portion is substantially the same as the length up to the other end edge of the joining portion of the backside stretch member It is preferable that it is formed substantially the same as the length up to.
According to this configuration, the connecting plate is connected to the front and back tension members forming the side openings without excess or deficiency with respect to the entire length thereof, so the connecting plate is connected to the front and back tension members. Therefore, it is possible to surely resist the force to tear off the joint portion, and thus, the breakage of the joint portion is more reliably prevented.

Moreover, in the load support member for a chair, on both sides in the width direction of the frame member, recesses that are opened to the outside in the width direction are formed in the respective portions on the other end edge side, and the connecting plate is It is preferable that it is disposed in contact with or close to the inner surface of the recess.
According to this configuration, by arranging the bent connecting plate in the recess, the connecting plate is in contact with or close to the inner surface of the recess by trying to return to the original flat shape from the bent state. The connecting plate is difficult to see from the outside. Therefore, even if the lower end of the side opening is a free end, the aesthetic appearance is not impaired.

In the chair load support member, the recess is preferably provided with a closing member for closing the opening.
According to this configuration, since the closing means for closing the opening of the concave portion is provided, even if the lower end of the side opening is a free end, the side opening is hidden by the closing means, so that it is more beautiful. It will be a thing. In addition, by closely fitting the closing means to the recess, the other end edge side that forms the side opening of the tension member is prevented from falling out of the recess.

The chair according to the present invention is characterized in that the chair load support member is provided as a backrest in which the saddle member is disposed along the vertical direction and the opening is disposed at the lower end.
According to this chair, since the backrest composed of the chair load support member is prevented from being damaged at the joint portion by the connecting plate, the seated person applies a load to the backrest composed of the chair load support member by the back. However, the moment in the peeling direction is less likely to act on the joint portion between the front and back tension members, and therefore, the joint portion is prevented from being damaged for a long period of time.

According to the load supporting member for a chair of the present invention, it is possible to easily cover the frame member with the bag-like tension member, and it is possible to prevent breakage of the joint portion between the front side tension member and the back side tension member constituting the tension member. .
According to the chair of the present invention, since the joint portion is prevented from being broken for a long period of time, the chair can be used for a long period of time.

It is the perspective view seen from the front side of one embodiment of the chair concerning the present invention. It is the perspective view seen from the back side of one embodiment of the chair concerning the present invention. It is a disassembled perspective view of the backrest used as one embodiment of the load supporting member for chairs concerning the present invention. It is a figure which shows schematic structure of a frame member, Comprising: (a) is a front view, (b) is a side view. It is AA arrow sectional drawing of Fig.4 (a). FIG. 5 is a cross-sectional view taken along line BB in FIG. 4 (a). It is a disassembled perspective view of the member provided in a tension material and a tension material. It is CC sectional view taken on the line of FIG. It is DD sectional view taken on the line in FIG.

  Hereinafter, embodiments of a chair according to the present invention will be described in detail with reference to the drawings. In the following description, the direction in which the front of the person seated in the chair 1 in the normal posture faces is referred to as “front” or “front”, and the opposite direction is referred to as “rear” or “back”. To do. For “upper”, “lower”, “left”, and “right”, the upper direction of a person seated in a chair in a regular posture is called “up”, and the opposite direction is called “lower”. The direction of the left side of a person seated in a normal posture is called “left”, and the direction opposite to that is called “right”. That is, the vertical direction is called the up-down direction, and the horizontal direction is called the left-right direction.

  FIG. 1 is a perspective view of a chair according to an embodiment of the present invention as seen from the front side, and FIG. 2 is a perspective view of the same as seen from the back side. In these figures, reference numeral 1 is a chair. The chair 1 is attached to a leg 2 placed on the floor, a support base 3 installed at the upper end of the leg 2, a seat 4 on which a seated person sits, and an upper surface of the support base 3. The seat receiving member 5 that supports the seat body 4 and the backrest 6 that extends from the support base 3 to the rear upper side and supports the back of the seated person seated on the seat body 4 are configured.

  The leg 2 includes a multi-leg 7 with casters 7 a and a pedestal 8 that stands up from the center of the multi-leg 7 and incorporates a gas spring that is a lifting mechanism, and a support base 3 is provided at the upper end of the pedestal 8. It is attached. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 8 and a tilt adjustment mechanism for the backrest 6.

  The backrest 6 is an embodiment of a load support member for a chair according to the present invention. As shown in FIG. 3, which is an exploded perspective view of the backrest 6, the backrest 6 is separated in the width direction (left-right direction) of the chair 1. Then, the frame member 10 provided with a pair of collars 9 and 9 arranged substantially in parallel, the face member 11 laid between the pair of collars 9 and 9, and the pair of collars 9 and 9 were covered. A bag-like tension member 12 and armrests 13 (blocking members) attached to both sides in the width direction of the frame member 10 are provided.

  As shown in FIGS. 4A and 4B, which are schematic configuration diagrams, the frame member 10 is provided integrally with the pair of saddle members 9 and 9 and the lower end portions (the other end portions) thereof. It has a lower frame portion 14 and is configured by attaching a connecting frame 15 to the upper end portions (one end portions) of the pair of ribs 9 and 9. In the present embodiment, as described above, the armrests 13 are attached to both sides in the width direction of the frame member 10, that is, to the connection portions between the pair of eaves 9 and 9 and the lower frame portion 14. However, the chair load support member (backrest 6) according to the present invention may be configured such that the armrest 13 is not attached to the frame member 10.

  The face material 11 is formed in a substantially rectangular shape as shown in FIG. 3, and a side material support 11a made of a mesh material, an elastomer, or the like, and side support provided on both sides of the face material main body 11a in the width direction. It consists of frames 11b and 11b and a lower support frame 11c provided at the lower end of the face material body 11a. The side support frame 11b and the lower support frame 11c are attached toward the back (backward direction) of the face material 11 by sewing or the like. The face material 11 is supported by supporting the side support frames 11b and 11b on the side support part 16 of the saddle member 9 shown in FIG. 4A, and the lower support frame 11c is the lower support part 17 of the lower frame part 14. By being attached to and supported by the frame member 10, the frame member 10 is fixed.

  As shown in FIG. 5 which is a cross-sectional view taken along the line AA in FIG. The brazing material 9 and a thin plate-like support material 18 disposed along the brazing material 9 with a gap on the inner surface side of the brazing material 9 are formed. That is, the gap formed between the saddle member 9 and the support member 18 serves as a fitting recess 19 for attaching the side support frame 11 b of the face member 11. In addition, as shown in FIG. 4A, an attachment plate 20 for attaching the support member 18 to the saddle member 9 is provided between the saddle member 9 and the support member 18 between the saddle member 9 and the support member 18. It is provided on the side (back side). Each mounting plate 20 is provided with a plurality of mounting ports 20a (six in FIG. 4A) in the vertical direction at substantially equal intervals.

  The fitting recess 19 opens to the front side (front side) of the chair 1, that is, the side receiving the load of the seated person (load receiving surface side). As shown in FIG. A side support frame 11b of the material 11 is fitted. As shown in FIG. 3, a plurality of claw portions 21 (six in FIG. 3) are formed on the rear end portion of the side support frame 11b. These claw portions 21 respectively enter the mounting opening 20a of the mounting plate 20 and are locked to the retaining projection 20b of the saddle member 9 shown in FIG.

  That is, the claw portion 21 protrudes from the rear end of the side support frame 11b to the rear side, and is further bent to the outside in the width direction of the chair 1 and then returned to the front side. The portion 21 a) is locked to the retaining projection 20 b formed at the innermost portion on the back side of the saddle member 9, so that the side support frame 11 b is prevented from coming out of the fitting recess 19. That is, when the folded portion 21a is inserted into the fitting recess 19, the folded portion 21a is elastically deformed in a direction perpendicular to the depth direction when it gets over the retaining projection 20b. Then, after getting over the retaining projection 20b, the folded portion 21a is elastically restored and locked to the retaining projection 20b. Thereby, the fitting to the fitting recessed part 19 can be completed only by pushing in the folding | returning part 21a. With such a folding back portion 21a of the claw portion 21 formed at the rear end portion of the side support frame 11b and the retaining protrusion 20b formed at the innermost portion of the fitting recess 19, the retaining member according to the present invention is provided. That is, a retaining portion that restricts the side support frame 11b from slipping out of the fitting recess 19 by engaging with each other is formed.

  In addition, when the side part support frame 11b is inserted in the fitting recessed part 19, the some nail | claw part 21 is each inserted in the corresponding attachment port 20a, and the folding | returning part 21a latches to the retaining projection part 20b. It has been made.

  Here, the side support frame 16 b for guiding the side support frame 11 b to the fitting recess 19 on the outer side in the width direction of the chair 1 at the outer periphery of the opening of the fitting recess 19 is provided on the side support 16 of the saddle member 9. A transition surface 22 is formed. In the present embodiment, the transition surface 22 is formed in a region from the end of the front side of the saddle member 9 (the front side of the chair 1) to the opening end of the fitting recess 19, and the rear side ( In order to narrow the opening of the fitting recess 19 as it goes to the back side of the chair 1, it is inclined so as to approach the opening end of the fitting recess 19. In the present embodiment, the transition surface 22 is provided on the inner surface side of the saddle member 9 that forms the fitting recess 19, and is on the front side of the saddle member 9 (front side of the chair 1) and on the inner side surface of the saddle member 9. It is formed in an arc shape in a cross sectional view that bulges toward the side.

  In such a configuration, when the side support frame 11b of the face member 11 is fitted into the fitting recess 19, for example, the claw portion 21 side of the side support frame 11b is placed outside the fitting recess 19. The side support frame 11b can be easily fitted into the fitting recess 19 by being caused to abut against the transition surface 22 and then slide along the inclination of the transition surface 22 to be guided by this inclination (transition surface 22). it can. Accordingly, after the side support frame 11b is fitted into the fitting recess 19, the claw portion 21 is inserted into the mounting opening 20a, and the turn-back portion 21a is locked to the retaining projection 20b, whereby the side support frame 11b. Can be fixed to the side support 16.

  The support member 18 is a free end (free end) formed so that the opening side of the fitting recess 19 (the front side of the chair 1) can swing. Thus, the side support frame 11b can be easily fitted into the fitting recess 19. That is, the free end (support material 18) can be pushed and spread using a hand opposite to the hand holding the face material 11, and the side support frame 11b can be fitted into the fitting recess 19 in this state.

  Furthermore, the front-end | tip part (end part of the front side of the chair 1) in the free end of the support material 18 is the end surface (end part) of the front side (front side of the chair 1) of the site | part which forms the fitting recessed part 19 in the collar 9. ) Is located closer to the back side of the chair 1 than. Thereby, since the position of the face material 11 is retracted (offset) to the back side of the chair 1 from the end portion on the front side (load receiving face side) of the collar material 9, the face material 11 will be described later. The front side of this is brought into contact with the back side, and the deformation of the upholstery material 12 is prevented. Further, by attaching the face material 11 so as to fill the step between the front end portion of the free end and the front end portion of the saddle material 9, the face material 11 and the saddle material 9 are mutually supported. In this state, it can be continued without a step.

  Further, as shown in FIG. 3, a claw portion 23 is also formed in the lower support frame 11c, and the claw portion 23 is fitted into the mounting opening 24 in the lower support portion 17 of the lower frame portion 14, thereby the lower support frame 11c. 11 c is fixed to the lower frame portion 14. In other words, a configuration similar to that of the folded portion 21a and the retaining projection 20b of the claw portion 21 described above is provided between the claw portion 23 of the lower support frame 11c and the mounting opening 24 of the lower support portion 17 as necessary. A retaining portion is formed on the lower support frame 11c, whereby the lower support frame 11c is fixed to the lower frame portion 14. As described above, the side members 11 b and 11 b and the lower support frame 11 c are fixed to the frame member 10, whereby the face material 11 is also fixed to the frame member 10.

  In the present embodiment, the face material 11 fixed to the frame member 10 is repelled by receiving a load (weight) applied to the face material body 11a by the back of the seated person, that is, a load in a direction perpendicular to the face (direction perpendicular to the face). It is an elastic body (elastic resistance body). As described above, the face material main body 11a is formed of a mesh material or an elastomer so as to be elastically deformable, and is configured to exhibit a repulsive force when receiving a load in a direction perpendicular to the face. Note that the side support frame 11b and the lower support frame 11c are formed of an elastically deformable resin.

  Further, the frame member 10 is formed with recesses 25 that open to the outside in the width direction at the respective lower end edge sides (the other end edge side) on both sides in the width direction, that is, at portions intersecting the lower frame portion 14. As shown in FIG. 6 which is a cross-sectional view taken along the line BB in FIG. 4A, the recess 25 is formed up to the inside of the saddle member 9, and in this embodiment, the opening of the recess 25 is formed. The armrest 13 (occlusion member) is attached. That is, the armrest 13 is detachably fixed to the nut 26 embedded in the recess 25 by the bolt 27.

  In addition, in this recessed part 25, the connection board 32 which connects the side part opening of the tension material 12 mentioned later is provided. Further, the armrest 13 is formed with a through hole 13a for attaching a bolt 27 therein, and a cover plate 13b for closing the through hole 13a is attached to the opening on the outside of the through hole 13a. The opening on the outside of the through hole 13a is preferably formed in the same opening shape as the recess 25 to which the armrest 13 is attached. When configured in this way, when the armrest 13 is not attached to the recess 25, the opening can be closed by attaching the cover plate 13 b to the recess 25.

  As shown in FIG. 7, the upholstery 12 is provided on the front side (load receiving surface side) of the chair 1 and on the front side of the chair 1 (on the load receiving surface side) and on the back side of the chair 1 (opposite to the load receiving surface). The substantially rectangular backside stretch material 29 to be disposed is formed in a bag shape, and is covered with a pair of eaves members 9 and 9 as shown in FIGS. As shown in FIG. 3, the upholstery material 12 has a front side upholstery material 28 and a back side upholstery material 29 which are stitched at both the upper end edge (one end edge) in the length direction of the brim material 9 and the side end edges in the width direction. Thus, an opening 30 continuous in the width direction is formed on the lower end edge side (the other end edge side) in the length direction.

  However, as shown in FIG. 7, the tension member 12 has an end 31 a on the lower edge side of the joining portion 31 at both side edges of the front side tension material 28 and the back side tension material 29, and the lower edge of the side edge. It is located near the upper end edge of the side end edge. Thus, the opening 30 is formed to have a side opening 30 a that opens to the lower end edge side of both side edges of the tension member 12.

  As shown in FIGS. 3 and 7, the side opening 30 a is provided with a connecting plate 32 that connects the lower end edge side of the front side tension member 28 forming the side opening 30 a and the lower end edge side of the back side tension member 29. ing. The connecting plate 32 is a thin plate made of a bent resin or the like that is elastically deformed in the shape of a letter at the center in the length direction so that the upper end edge side of the tension member 12 is convex and the lower end edge side is concave. In addition, one side sandwiching the bent portion 32 a shown in FIG. 7 is connected to the lower end edge side of the front side tension member 28, and the other side is connected to the lower end edge side of the back side tension member 29.

  Since the connecting plate 32 is formed with a bent portion 32a at the center in the length direction, the length of one side sandwiching the bent portion 32a is substantially the same as the other length. Thus, the length of one side of the connecting plate 32 is substantially the same as the length of the portion forming the side opening 30 a of the front side tension member 28, and the length of the other side is the side of the back side tension material 29. The length of the part forming the part opening 30a is substantially the same. That is, the length of one side of the connecting plate 32 is substantially the same as the length from the end 31a on the lower end edge side of the joining portion 31 to the lower end edge of the front side tension member 28, and the length on the other side. However, the length of the back side tension member 29 from the end portion 31a on the lower end edge side of the joining portion 31 to the lower end edge is formed substantially the same.

  The front side tension member 28 or the back side tension member 29 and the connection plate 32 are connected by, for example, sewing. Here, the connection of the connecting plate 32 to the front side tension member 28 and the back side tension member 29 is performed, for example, by the following procedure. First, one of the front-side upholstery material 28 and the back-side upholstery material 29 is turned over so that the back surface side is exposed. Subsequently, one side of the connecting plate 32 is placed on the upholstery material with the back side facing up, and the connecting plate 32 is in a state where the upholstery material is down and the connecting plate 32 is up, that is, the connecting plate 32 is visible. Is sutured to the upholstery. At this time, the end of the other side of the connecting plate 32 (the side to be sewn to the other tension member) is in a floating state. Next, the tension member is reversed, and the other side of the connecting plate 32 is stitched to the back side of the other tension member in the same manner as in the case of the one tension member described above. Thereafter, the portions forming the side openings 30a of the front side tension material 28 and the back side tension material 29 sewn to the connection plate 32 are folded inward from the outside together with the connection plate 32 as shown in FIG. Put in. Thereby, the connecting plate 32 can be disposed in contact with the inner surface of the recess 25. That is, by restoring the connecting plate 32 bent by elastic deformation, the connecting plate 32 is expanded and both sides thereof are brought into contact with the inner surface of the recess 25. The connecting plate 32 may be formed into a bent shape without being elastically deformed. In that case, when the connecting plate 32 is placed in the recess 25, the connecting plate 32 may be disposed in a close proximity without contacting the connecting plate 32 to the inner surface of the recess 25.

  Further, as shown in FIG. 3, a front back core material 33 is attached to the opening 30 of the upholstery material 12 on the rear surface of the lower end portion of the front side upholstery material 28, and A core member 34 is attached. The front back core material 33 and the back back core material 34 are thin plate-like materials made of resin or the like, and are attached to the front side tension material 28 or the back side tension material 29 by sewing or the like. A plurality of engaging portions (not shown) are formed on the inner surface (rear surface) of the front back core material 33. By engaging these engaging portions with engaging portions (not shown) formed on the lower support portion 17 of the lower frame portion 14, the front back core material 33 is attached to the lower support portion 17 and supported. Has been. Further, the rear back core material 34 is formed with a plurality of engaging portions (not shown) on its inner surface (front surface). By engaging these engaging portions with engaging portions (not shown) formed on the lower support portion 17 of the lower frame portion 14, the rear back core material 34 is also attached to the lower support portion 17. It is supported. Thus, by attaching the front back core material 33 and the back back core material 34 to the lower support portion 17, the opening 30 of the bag-like tension material 12 is closed by the lower frame portion 14. The opening 30 is not exposed.

  Further, the front tension material 28 and the back tension material 29 are joined to the upholstery material 12 at the end edge (upper end edge) on the upper end edge side (one end edge side) slightly inside the outer end in the width direction of the chair 1. A surplus length portion 35 is formed. Then, as shown in FIG. 8 which is a cross-sectional view taken along the line CC in FIG. 4B, an exposure port 36 for exposing the brazing material 9 is formed inside the extra length portion 35 in the width direction. Has been.

  The brazing material 9 has a fitting hole 9 a having an opening communicating with the exposure port 36 at an end on the exposure port 36 side, that is, an upper end portion, and the extra length portion 35 protruding in the length direction of the brazing material 9. And a protruding edge portion 9b that is in contact with. In the present embodiment, the projecting edge portion 9b is formed in an annular shape continuously on the outer peripheral portion surrounding the fitting hole 9a over the entire circumference thereof. Therefore, the protruding edge portion 9 b is in contact with not only the extra length portion 35 of the tension member 12 but also the entire outer peripheral portion of the exposure port 36.

  The connection frame 15 is attached to the fitting hole 9a of the brazing material 9 exposed to the exposure port 36 and communicating with the exposure port 36 in this way. The connection frame 15 is fitted into the fitting hole 9a through the exposure port 36 and closes the exposure port 36, and the connection unit that connects the pair of closing portions 37 and 37 as shown in FIG. 38, and the pair of closing portions 37, 37 are attached to the corresponding brazing material 9, thereby connecting the pair of brazing materials 9, 9.

  As shown in FIG. 8, the closing portion 37 is fitted into the fitting hole 9a through the exposure port 36, and the fitting projection 37a is located on the base side (upper end side) of the fitting projection 37a. The cover portion 37b extends outward. The covering portion 37b is formed on the protruding edge portion 9b of the eaves member 9 through the outer peripheral portion of the exposure port 36 including the surplus length portion 35 of the tension member 12 in a state where the fitting protrusion 37a is fitted in the fitting hole 9a. I'm hitting. The fitting protrusion 37a has a cylindrical shape having a hole therein, and a nut is accommodated in the hole as will be described later.

  As shown in FIG. 9, which is a cross-sectional view taken along the line DD of FIG. 4B, the fixing of the blocking portion 37 to the brazing material 9 (fitting hole 9a) is performed on the rear side of the brazing material 9. It is made by a screw 39 inserted from the (rear side). That is, the screw 39 is inserted into the fitting hole 9a through a screw hole (not shown) formed on the rear side (back side) of the brazing material 9. The screw 39 is further inserted into the fitting projection 37a fitted in the fitting hole 9a, and is screwed into the nut 40 accommodated in the hole. Thereby, the fitting protrusion 37a is screwed into the fitting hole 9a of the collar member 9 and fixed.

In addition, attachment of the connecting frame 15 and the tension member 12 to the pair of ribs 9 and 9 including such screwing is performed as follows.
First, as shown in FIG. 3, connecting plates 32 are respectively attached to the side openings 30 a of the bag-like tension material 12, the front-side tension core material 33 is attached to the front-side tension material 28, and the back-side tension material 29. The rear back core material 34 is attached to each. However, the attachment of the front back core 33 and the back back core 34 may be performed later.

  Next, the fitting protrusions 37a of the closing portion 37 of the connecting frame 15 are inserted into the exposed openings 36, 36 on the upper end edge of the tension member 12 from above, respectively, and the fitting protrusion 37a is stretched from the exposed openings 36, 36. Project into the material 12. Subsequently, the tension member 12 is turned over with the fitting protrusion 37a protruding from the exposure openings 36 and 36 in this manner. That is, the tension member 12 turned upside down with the fitting protrusion 37a on the lower side is pulled upward, and the connecting portion 38 of the connection frame 15 is accommodated in the inverted tension member 12 and the fitting protrusion 37a is moved to the lower end side. Expose in a protruding state.

  Next, the pair of fitting protrusions 37a protruding to the lower end side are fitted into the corresponding fitting holes 9a of the collar member 9, and then the fitting protrusion 37a is screwed to the collar member 9 as shown in FIG. To do. The face member 11 is attached to the frame member 10 prior to fitting the fitting protrusion 37 a into the fitting hole 9 a of the collar member 9. When the fitting projection 37a is fitted into the fitting hole 9a of the saddle member 9, the fitting projection 37a fits into the fitting hole 9a of the saddle member through the exposed port 36 of the tension member 12 as shown in FIG. The cover portion 37b abuts against the projecting edge portion 9b of the eaves member 9 through the extra length portion 35 and the like by contacting the entire outer periphery of the exposure port 36, so The extra length portion 35 and the like of the tension member 12 are aligned. Thereby, even when the upholstery material 12 is greatly stretched, the positional deviation between the exposure port 36 and the eaves material 9 is suppressed.

  When the fitting protrusion 37a is screwed in this way and the connecting frame 15 is attached to and fixed to the pair of ribs 9 and 9, the tension member 12 that has been turned over is returned to its original position and covered with the pair of ribs 9 and 9. . At that time, since the opening 30 of the tension member 12 has the side opening 30a, the opening of the bag-like tension member 12 can be greatly expanded, and therefore the tension member 12 can be easily covered with the frame member 10. Can do. By returning the tension member 12 that has been turned upside down in this way, the bag-like tension member 12 passes through the opening 30 to the saddle members 9, 9 (frame member 10) in one end side in the length direction (upper end). Side). Accordingly, the screw 39 to which the fitting protrusion 37a is fixed is hidden by the tension member 12 without being exposed.

  When the tension member 12 is thus covered on the frame member 10, the connecting plate 32 attached to the side opening 30a of the tension member 12 is pushed into the recess 25 of the frame member 10 as shown in FIG. Thereby, the site | part which forms each side opening 30a of the front side tension material 28 and the back side tension material 29 connected with the connection board 32 is also accommodated in the recessed part 25. FIG. Therefore, by attaching the armrest 13 to the recess 25, the side opening 30a of the tension member 12 and the connecting plate 32 are hidden without being exposed.

  Further, the front back core member 33 and the rear back core member 34 attached to the opening 30 of the tension member 12 are also attached to the lower support portion 17. Thereby, the upholstery material 12 is fixed to the frame member 10. In this embodiment, the tension member 12 fixed in this manner has a repulsive force against a load (weight) applied by the seated person's back, that is, a load in a direction perpendicular to the surface, from the same repulsive force of the face member 11. It is relatively small. That is, in this embodiment, the face material 11 attached to the frame member 10 as a strength member is a repelling body (elastic resistor) that repels a load (weight) applied by the seated person's back. . Thereby, since there is no restriction | limiting about a repulsive force about the material, design, etc. of the front side tension material 28 and the back side tension material 29 which comprise the tension material 12, it selects freely based on the property etc. which are calculated | required. That is, it has a high degree of freedom in terms of design.

  The backrest 6 (chair load supporting member) having such a configuration is configured such that the attachment portion 41 of the lower frame portion 14 shown in FIG. 3 is attached to the support base 3 shown in FIGS. Is assembled. Further, since the backrest 6 is attached to the support base 3 in this way, the front back core 33 and the back back core 34 attached to the opening 30 of the upholstery 12 are not exposed. It is stored in the material 12.

In the chair load support member (backrest 6) of the present embodiment, the opening 30 on the lower edge side of the tension member 12 has a side opening 30 a that opens on the side edge of the tension member 12. Therefore, when covering the tension member 12 on the collar members 9 of the frame member 10, the opening can be greatly expanded, and therefore, the operation of covering the tension member 12 on the frame member 10 can be facilitated.
Moreover, since the connecting plate 32 which connects the lower end edge side of the front side tension material 28 and the lower end edge side of the back side tension material 29 is provided in the side part opening 30a, the tension | tensile_strength which the tension material 12 generate | occur | produces is the front side in the side part opening 30a. Even if it acts so as to peel off the joining portion 31 between the tension member 28 and the back side tension member 29, the joining plate 31 can prevent the joining portion 31 from being damaged by resisting the peeling force.
Further, since the connecting plate 32 is connected to the front side tension member 28 on one side of the bent portion 32a and connected to the back side tension member 29 on the other side, the bent portion 32a tries to return to the original flat plate shape. Since the side opening 30a is easily opened by force and the open shape is easily maintained, it is possible to prevent the workability when the tension member is put on the frame member from being impaired.

  In addition, since the connecting plate 32 is connected to the front side tension member 28 and the back side tension member 29 forming the side opening 30a without excess or deficiency, the connection plate 32 is connected to the front side tension member 28 and the rear side tension member. It comes to resist against the force which tears off the junction part 31 with the material 29, Therefore The failure | damage of the junction part 31 can be prevented more reliably.

  Further, since the bent connecting plate 32 is disposed in the concave portion 25 that opens to the outside of the frame member 10, the connecting plate 32 comes into contact with the inner surface of the concave portion 25 by returning to the original flat shape from the bent state. Or close. Therefore, since it becomes difficult to visually recognize the connecting plate 32 from the outside, even if the lower end of the side opening 30a connected to the connecting plate 32 is a free end, the aesthetic appearance is not impaired.

  Further, since the armrest 13 is provided as a closing means for closing the opening of the recess 25, even if the lower end of the side opening 30a is a free end, the side opening 30a can be hidden by the armrest 13, Therefore, it will be more aesthetically pleasing. Further, by closely fitting the armrest 13 with the recess 25, it is possible to prevent the lower end edge side forming the side opening 30 a of the tension member 12 from falling out of the recess 25.

  In the chair 1 of the present embodiment, the backrest 6 is prevented from being damaged at the joint portion 31 by the connecting plate 32, and even if a seated person applies a load to the backrest 6 by the back, Since the moment in the peeling direction is less likely to act on the joint portion 31 with the backside tension member 29, damage to the joint portion 31 can be prevented over a long period of time. Therefore, according to this chair 1, it becomes the thing which can be used over a long period of time.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the lower end portion of the front-side tension member 28 and the lower end portion of the back-side tension member 29 are attached to the lower frame portion 14 via the front-side tension core material 33 and the rear-side tension core material 34, respectively. However, for attachment to the lower frame portion 14 of the lower end portion of the front side tension member 28 and the lower end portion of the back side tension member 29, an appropriate member other than the front side backing core material 33 and the rear side tension core material 34 is used. You may go.

DESCRIPTION OF SYMBOLS 1 ... Chair, 6 ... Backrest (chair load support member), 9 ... Saddle material, 10 ... Frame member, 11 ... Face material, 12 ... Tension material, 13 ... Armrest (occlusion member), 13b ... Cover plate, 25 ... concave portion, 28 ... front side tension material, 29 ... back side tension material, 30 ... opening part, 30a ... side part opening, 31 ... joining part, 31a ... end part, 32 ... connecting plate, 32a ... bending part

Claims (5)

A load supporting member for a chair provided in the chair,
A frame member comprising a pair of eaves members spaced apart in the width direction of the chair and arranged substantially in parallel;
The front-side tension member arranged on the load-receiving surface side of the chair and the back-side tension material arranged on the opposite side of the load-receiving surface are both one end edge in the longitudinal direction of the saddle member and the side in the width direction. Joined at the edge and formed in a bag shape having an opening continuous in the width direction on the other end edge in the length direction, and through the opening to the frame member the length of the frame member A tension member covered from one end side in the vertical direction,
By locating the end portion on the other end edge side of the joining portion at the side end edges of both the front side tension material and the back side tension material in the tension material closer to the one end edge than the other end edge, The opening is formed having a side opening that opens to the other end edge side of both side edges of the tension member,
The side opening is provided with a connecting plate for connecting the other end edge side of the front side tension member and the other end edge side of the back side tension member forming the side opening,
The connecting plate is bent so that the one end edge side is convex and the other end edge side is concave, so that the connecting plate is connected to the other end edge side of the front side tension member on one side across the bent portion. A load supporting member for a chair, characterized in that it is connected to the other end edge side of the back-side tension member on the other side across the section. The length of one side of the connecting plate sandwiching the bent portion is formed substantially the same as the length from the end portion on the other end edge side of the joining portion to the other end edge of the front side tension member,
The length of the other side of the connecting plate across the bent portion is formed to be substantially the same as the length of the backside tension member from the end on the other end edge side of the joining portion to the other end edge. The load supporting member for a chair according to claim 1, wherein On both sides of the frame member in the width direction, recesses that are open to the outside in the width direction are formed in the respective other edge side portions,
The load support member for a chair according to claim 1 or 2, wherein the connecting plate is disposed in contact with or close to the inner surface of the recess.   The load supporting member for a chair according to claim 3, wherein the concave portion is provided with a closing member for closing the opening.   The load supporting member for a chair according to any one of claims 1 to 4 is provided as a backrest in which the saddle member is disposed along the vertical direction and the opening is disposed at the lower end. Characteristic chair.

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