JP2018033862A - Load bearing member for chair and chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load bearing member for chairs configured to assemble a load bearing surface component to a pair of frame members at high support strength and suppress positional deviation and backlash of the load bearing surface component, and to provide a chair.SOLUTION: A load bearing member for chairs includes: a pair of backrest support parts 13b; a first back plate member 16 erected on the pair of backrest support parts 13b; and an upper part connecting frame 18 fixed to the ends of the backrest support parts 13b and regulating removal of the first back plate member 16. The load bearing member includes recessed grooves that extend substantially along the longitudinal direction of the backrest support parts 13b and in which a chair-width-directional outward edge of the first back plate member 16 is locked in an inserted state. The upper part connecting frame 18 includes: masking pieces 35 for masking longitudinal ends of the recessed grooves; and a suspension wall 37 coming into contact with a surface intersecting with a load input direction of the first back plate member 16 in the inside of the chair width direction with respect to the recessed grooves.SELECTED DRAWING: Figure 2

Description

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

  As a backrest structure that supports the load on the back of the seated person, the backrest body, which is a load support surface constituent member, is engaged with a pair of frame members extending in the up-down direction by locking pieces or fitting of members. Those fixed by joining are known (for example, see Patent Documents 1 and 2).

  The backrest described in Patent Literature 1 has a plurality of fitting holes formed in a pair of frame members, and a latch that can be inserted into the fitting holes of the frame member at both ends in the chair width direction of the backrest body. A piece is attached. In the backrest body, the locking pieces at both ends in the chair width direction are inserted into the corresponding fitting holes of the frame member, and in this state, the backrest body is locked and fixed to the frame member.

  However, in the backrest described in Patent Document 1, since the backrest body is spot-locked by a locking piece at a plurality of positions of the frame member, the backrest body that receives the seating load of the seated person is attached to the frame. It is difficult to assemble the member with high support strength.

On the other hand, the backrest described in Patent Document 2 has a recessed groove that opens inward in the chair width direction at the upper end side portion of the pair of frame members, and the upper end sides on both sides in the chair width direction of the backrest body. A mounting bracket is attached to the part. The concave groove of the frame member is formed so as to reach the upper end portion of the frame member, and the upper end portion is closed by the closing member in a state where the corresponding mounting bracket of the backrest body is fitted.
In this backrest, the mounting bracket integrated with the backrest body is fitted into the corresponding concave groove of the frame member, so that the seating load input to the backrest body is supported by the frame member with high support strength. Can be made.

Japanese Utility Model Publication No. 52-012574 Japanese Patent Publication No. 47-037070

  The backrest described in Patent Document 2 has a structure in which a mounting bracket integrated with the backrest main body is inserted into and supported by the recess of the frame member, so that the groove width of the recessed groove is wider than the width of the mounting bracket. It is necessary to form, and a gap is generated between the recessed groove and the mounting bracket. However, if the gap between the concave groove and the mounting bracket is increased, it is likely to cause a positional deviation or backlash of the backrest body.

  Therefore, the present invention is for a chair capable of assembling a load support surface constituting member to a pair of frame members with high support strength and suppressing the displacement and backlash of the load supporting surface constituting member with respect to the frame member. A load supporting member and a chair are to be provided.

The chair load supporting member according to the present invention employs the following configuration in order to solve the above problems.
The chair load support member according to the present invention is disposed separately in the chair width direction, and extends between the pair of frame members extending in the longitudinal direction intersecting the load input direction from the seated person, and the pair of frame members. A load receiving surface constituting member for receiving the load of the seated person, and being fixed to the longitudinal end portion of the frame member, and the load receiving surface constituting member coming off from the longitudinal end portion of the frame member The frame member extends substantially along the longitudinal direction, and the outer edge of the load receiving surface constituting member is locked in the inserted state. The omission control member has a groove, and shields the end portion in the longitudinal direction of the concave groove in a state where the outer edge of the load receiving surface constituting member is inserted into the concave groove. And chair width than the groove Characterized in that it includes a displacement restricting portion inside abuts the plane crossing the load input direction of the load bearing surface constituting member.

  When assembling the load receiving surface constituting member to a pair of frame members, insert the edge of the load receiving surface constituting member on the outside in the chair width direction into the recessed groove of each frame member, and in that state, the length of the recessed groove of the frame member A pull-out restricting member is fixed to the end in the direction. As a result, the end portion in the longitudinal direction of the groove is shielded by the shielding portion of the slip-out restricting member, and the removal of the load receiving surface constituting member from the groove in the frame member is restricted. The load receiving surface constituting member is assembled in the frame member with high support strength by being locked in the concave groove of the frame member. Further, at this time, the displacement restricting portion of the removal restricting member abuts on the surface intersecting the load input direction of the load receiving surface constituting member, so that the relative displacement in the groove width direction of the concave groove of the load receiving surface constituting member with respect to the frame member is reduced. It becomes possible to regulate. As a result, the load receiving surface constituting member is assembled to the frame member in a state in which the positional deviation and rattling with respect to the frame member are suppressed.

The contact surface of the displacement restricting portion with the load receiving surface constituting member may be formed so as to be substantially continuous with the inner surface on the back side in the load input direction of the concave groove.
In this case, the load of the seated person input to the load receiving surface constituting member is supported by the inner side surface of the recessed groove of the frame member on the back side in the load input direction and the contact surface of the displacement restricting portion. Therefore, it is possible to stably support the load input to the load receiving surface constituting member over a wide area.

The disconnection restricting member includes a pair of shielding portions that closes the longitudinal ends of the concave grooves of the frame members, and a connecting portion that connects the pair of shielding portions, and the displacement restricting portion. May be formed in the connecting portion.
In this case, since the connecting part that connects the pair of shielding parts is provided in the drop-out restricting member, when the shielding parts on both sides of the drop-out restricting member are fixed to the longitudinal ends of the pair of frame members, End portions in the longitudinal direction of the pair of frame members are rigidly coupled to each other. Further, since the displacement restricting member is formed at the connecting part where both ends are coupled to the pair of frame members, the displacement restricting part is supported by the pair of frame members with high support strength. . Therefore, by adopting this configuration, it is possible to more stably suppress the displacement and backlash of the load receiving surface constituting member by the displacement restricting portion.

The drop-out restricting member may have a displacement restricting surface that can come into contact with an end surface in a direction along the longitudinal direction of the load receiving surface constituting member, on the inner side in the chair width direction than the concave groove.
In this case, the slip-out restricting member can suppress displacement and backlash in the direction along the longitudinal direction of the load receiving surface constituting member by the displacement restricting surface.

  A chair according to the present invention includes any one of the above-described chair load support members as at least one of a backrest and a seat.

  In the present invention, in a state where the outer edge of the load receiving surface constituting member in the chair width direction of the load receiving surface constituting member is inserted into the concave groove of the frame member, the shielding portion that shields the longitudinal end of the concave groove, and the concave groove A displacement restricting portion that is in contact with a surface that intersects the load input direction of the load receiving surface constituting member on the inner side in the chair width direction is provided on the slip-out restricting member. For this reason, according to the present invention, the load receiving surface constituting member can be locked in the concave groove of the frame member, and the load supporting surface constituting member can be assembled to the pair of frame members with high support strength, and the removal restriction is achieved. Since the displacement restricting portion of the member comes into contact with the surface intersecting the load input direction of the load receiving surface constituting member, it is possible to suppress the positional deviation and shakiness of the load supporting surface constituting member with respect to the concave groove of the frame member.

It is a perspective view of the chair concerning one embodiment of the present invention. It is a perspective view of the backrest part of the chair which concerns on one Embodiment of this invention. It is sectional drawing which follows the III-III line | wire of FIG. 1 of the chair which concerns on one Embodiment of this invention. It is a disassembled perspective view of the backrest part of the chair which concerns on one Embodiment of this invention. It is a disassembled perspective view of the seat part of the chair which concerns on one Embodiment of this invention. It is sectional drawing which follows the VI-VI line of FIG. 2 of the chair which concerns on one Embodiment of this invention. It is sectional drawing which follows the VII-VII line of FIG. 1 of the chair which concerns on one Embodiment of this invention. It is a perspective view of the backrest part of the chair which concerns on one Embodiment of this invention. It is a perspective view of the backrest part of the chair which concerns on one Embodiment of this invention. It is a perspective view of the backrest part of the chair which concerns on one Embodiment of this invention.

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

FIG. 1 is a diagram of a chair 10 according to the present embodiment installed on a floor surface 1 such as a corrugated floor of a stadium as viewed from the upper left obliquely upper side. FIG. 2 is a view of the backrest 11 portion of the chair 10 as viewed from diagonally upward on the rear left side, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.
In the case of the present embodiment, as shown in FIG. 1, the chairs 10 are arranged side by side in pairs. The plurality of chairs 10 forming a set is supported and fixed to a metal beam member 2 having a rectangular cross-sectional shape extending in the left-right direction. The beam member 2 is fixedly installed on the floor surface 1 through a plurality of support columns 3. The beam member 2 and the plurality of columns 3 constitute an installation base for installing the plurality of chairs 10 on the floor surface 1.

  The chair 10 according to the present embodiment supports a backrest 11 that supports the back and waist of the seated person, a seat 12 that supports the seated person's buttocks and thighs, and supports the backrest 11 and the seat 12 on both sides in the chair width direction. A pair of main frames 13. In the present embodiment, the backrest 11 and the seat 12 constitute a chair load support member.

The main frame 13 includes a leg portion 13a whose lower end portion is fitted and fixed to the beam member 2, and a backrest support portion 13b (a frame member of the backrest 11) that stands upward after bending backward from the upper end portion of the leg portion 13a. ) And. The backrest support part 13b is slightly inclined forward from the lower end to a height position of about one third, and the upper side is inclined to change the direction obliquely rearward. That is, the backrest support portion 13b has a bent portion 14 whose inclination direction changes from the front to the rear at a height position of about one third from the lower end. The back support portions 13 b of the left and right main frames 13 are connected to each other at their bent portions 14 by a connecting frame 15.
The backrest 11 receives a load from the back of the seated person seated on the chair 10 to the rear side, but the backrest support part 13b is substantially along the vertical direction intersecting the input direction of the load from the seated person. Is extended.

A first back plate member 16 and a second back plate member 17 are installed on the left and right back support portions 13b. The first back plate member 16 is installed on the left and right backrest support portions 13 b above the connection frame 15, and the second back plate member 17 is disposed on the left and right back portions below the connection frame 15. It is constructed to the drooping support part 13b. In addition, an upper connection frame 18 that restricts the first back plate member 16 from being pulled upward is installed on the upper ends of the left and right back support portions 13b.
In the present embodiment, the backrest 11 is composed of left and right backrest support portions 13b, a first back plate member 16, and an upper connection frame 18 as main components. Further, the first back plate member 16 constitutes a load receiving surface constituting member in the backrest 11, and the upper connecting frame 18 constitutes a slip-out restricting member in the backrest 11.

  In the case of the present embodiment, almost the entire main frame 13 including the backrest support portion 13b, and the connection frame 15 and the upper connection frame 18 are formed of metal or hard resin. The first back plate member 16 and the second back plate member 17 are made of wood such as plywood. However, the material for forming the first back plate member 16 and the second back plate member 17 is not limited to wood, but may be other materials such as hard resin.

The seat 12 includes a pair of side frames 19 (frame members of the seat 12) that are spaced apart in the chair width direction, a seat plate member 20 that is installed on the left and right side frames 19, and a pair of side frames. 19 is attached to an end frame 21 that connects end portions on one end side in the longitudinal direction (side close to the backrest 11), and an end portion on the other end side in the longitudinal direction of the pair of side frames 19, And a front connecting frame 22 that restricts the seat plate member 20 from being pulled out to the other end side. Further, the substantially intermediate regions in the longitudinal direction of the left and right side frames 19 are connected to each other by a connecting frame 23.
In the present embodiment, the seat plate member 20 constitutes a load receiving surface constituting member in the seat 12, and the front connection frame 22 constitutes a slip-out restricting member in the seat 12. Further, the seat 12 receives a load from the buttocks and thighs of the seated person sitting on the chair 10 to the lower side, but the side frame 19 is substantially along the direction intersecting with the input direction of the load from the seated person. Is extended.

  In the case of this embodiment, the side frame 19, the end frame 21, the connecting frame 23, and the front connecting frame 22 are formed of metal or hard resin. The seat plate member 20 is made of wood such as plywood. However, the material for forming the seat plate member 20 is not limited to wood, but may be other materials such as hard resin.

  One end side in the longitudinal direction of the left and right side frames 19 of the seat 12 is rotatably supported by the upper end portion of the leg portion 13 a of the main frame 13 via a rotation mechanism 24. The seat 12 pivots and displaces between a seating position that falls forward substantially horizontally about the pivot axis of the pivot mechanism 24 and a retracted position that springs upward so as to substantially follow the front surface of the backrest 11. . The rotation mechanism 24 has a biasing spring (not shown) that biases the seat 12 toward the retracted position. In the following, for convenience of explanation, the side on which the rotation mechanism 24 is arranged in the longitudinal direction of the side frame 19 is called a rear side, and the side opposite to the side on which the rotation mechanism 24 is arranged is called a front side. And

FIG. 4 is a diagram of the backrest 11 portion disassembled and viewed from diagonally upward on the rear left side, and FIG. 5 is a diagram of the seat 12 segment exploded and viewed from diagonally upward on the front left side. 6 is a view showing a cross section of the backrest 11 along the line VI-VI in FIG. 2, and FIG. 7 is a view showing a cross section of the seat 12 along the line VII-VII in FIG.
As shown in FIGS. 4 and 6, the outer edge of the first back plate member 16 in the chair width direction is inserted in the chair width direction inner surface of the left and right back support portions 13 b of the backrest 11. The first fitting groove 30 (concave groove) to be locked and the second fitting groove 31 (FIG. 1) in which the edge of the second back plate member 17 on the outside in the chair width direction is locked in the inserted state. Reference) is formed. The first fitting groove 30 is formed above the connecting position of the connecting frame 15 of the backrest support portion 13b, and the second fitting groove 31 is formed from the connecting position of the connecting frame 15 of the backrest support portion 13b. Is also formed below. The first fitting groove 30 and the second fitting groove 31 are formed in a substantially rectangular shape in cross section and open to the inner side in the chair width direction.

  The first fitting groove 30 extends substantially along the longitudinal direction of the backrest support portion 13b at a position above the bent portion 14 of the backrest support portion 13b, and its upper end opens upward. doing. The first back plate member 16 has both edge portions on the outer side in the chair width direction fitted into the first fitting grooves 30 of the corresponding backrest support portions 13b on the left and right sides, so that the left and right backrest support portions 13b. It is erected between the upper areas. A resin spacer 33 having a substantially U-shaped cross section for narrowing the fitting gap with the first back plate member 16 is mounted inside the first fitting groove 30. In addition, a bulge block 29 that bulges in a substantially L shape on the rear side of the chair 10 and on the inner side in the chair width direction is integrally formed at the upper end of each back support portion 13b. The bulging block 29 is configured to fasten and fix an outer edge portion of the upper connecting frame 18 described later in the chair width direction.

The second fitting groove 31 extends substantially along the longitudinal direction of the backrest support portion 13b at a position below the bent portion 14 of the backrest support portion 13b. The second back plate member 17 is fitted to the second fitting grooves 31 of the left and right corresponding backrest support portions 13b at both ends on the chair width direction outer side, so that the left and right backrest support portions 13b It is built between the lower areas. Note that the upper and lower ends of the second fitting groove 31 are closed. The detailed structure of the members constituting the second fitting groove 31 will be described in detail later.
The connecting frame 15 that connects the bent portions 14 of the left and right backrest support portions 13b is a gap between the first backplate member 16 and the second backplate member 17 that are installed on the left and right backrest support portions 13b. Is blocked.

  The upper connecting frame 18 of the backrest 11 is overlapped with the upper end surfaces of the left and right backrest support portions 13b at both ends on the outer side in the chair width direction, and the upper end portion of the first fitting groove 30 (the end in the longitudinal direction). A pair of shielding pieces 35 (shielding portions). The shielding piece 35 is formed in a flat plate shape with a thin vertical thickness. The upper connecting frame 18 includes a connecting portion 36 that extends in the chair width direction and connects the left and right shielding pieces 35. The connecting portion 36 has an end wall 38 that is thin in the vertical direction and continues to the left and right shielding pieces 35, and a hanging wall 37 that extends downward from the end wall 38. The end wall 38 and the hanging wall 37 have a substantially T-shaped cross section. In the connecting portion 36, a substantially T-shaped cross section formed by the end wall 38 and the hanging wall 37 continues in the chair width direction.

  The end wall 38 is disposed so that its lower surface 38a faces the upper end surface of the first back plate member 16 in a state where the upper connecting frame 18 is coupled to the left and right back support portions 13b. . The lower surface 38 a of the end wall 38 abuts on the upper end surface of the first back plate member 16, thereby restricting the upward displacement of the first back plate member 16. In the present embodiment, the lower surface 38 a of the end wall 38 forms a displacement regulating surface of the backrest 11.

The hanging wall 37 is configured such that the front surface 37 a abuts the rear surface of the first back plate member 16 in a state where the left and right end portions of the upper connecting frame 18 are coupled to the corresponding left and right backrest support portions 13 b. ing. Further, the hanging wall 37 is positioned on the inner side in the chair width direction with respect to the first fitting groove 30 of the back support portion 13b in a state where the upper connecting frame 18 is coupled to the back support portion 13b. ing. Specifically, as shown in FIG. 6, the bulging block 29 at the upper part of the backrest support portion 13 b is adjacent to the inner side in the chair width direction of the inner side surface 30 a on the rear side in the first fitting groove 30. A step-shaped recess 28 is formed as described above, and the edge 37c of the hanging wall 37 on the outer side in the chair width direction is fitted between the recess 28 and the rear surface of the first back plate member 16. It has become. The front surface 37a of the hanging wall 37 is formed so as to be substantially continuous with the inner side surface 30a on the rear side in the first fitting groove 30 in a state where the upper connecting frame 18 is coupled to the backrest support portion 13b. .
In the present embodiment, the drooping wall 37 constitutes a displacement restricting portion of the upper connecting frame 18, and the front surface 37 a of the drooping wall 37 is pulled out, and the load receiving surface constituting member (first member) of the restricting member (upper connecting frame 18). It constitutes a contact surface that contacts the back plate member 16).

  Bolt insertion holes 27 communicating with the rear surface side and the inside of the recesses 28 are formed in the bulging block 29 of the left and right back support portions 13b. In contrast, the edge 37c of the hanging wall 37 of the upper connecting frame 18 on the outer side in the chair width direction is provided with a screwing hole 25 into which a bolt 26 as a fastening member is screwed. The upper connecting frame 18 is fastened and fixed to the left and right backrest support portions 13 b by tightening bolts 26 into the screw holes 25 through the bolt insertion holes 27 of the bulging block 29.

  Further, the upper connecting frame 18 has a displacement restricting block 32 at a portion adjacent to the edge portion 37 c of the left and right hanging walls 37. The displacement restricting block 32 is a block having an inverted triangular shape when the side surface 32a on the outer side in the chair width direction is suspended in a substantially vertical direction, and the side surface 32a is formed on the bulging block 29 of the corresponding backrest support portion 13b on the left and right. It comes to contact. The upper connecting frame 18 is restricted from relative displacement in the chair width direction with respect to the backrest support portion 13b by the side surfaces 32a of the left and right displacement restriction blocks 32 coming into contact with the corresponding bulging blocks 29.

  As shown in FIGS. 5 and 7, the outer edge of the seat plate member 20 in the chair width direction is locked in the inserted state on the inner surface of the left and right side frames 19 of the seat 12 in the chair width direction. A concave groove 40 is formed. The concave groove 40 is formed in a substantially rectangular cross section, opens to the inner side in the chair width direction, and extends substantially along the longitudinal direction of the side frame 19. One end of the recessed groove 40 opens at the front end of the side frame 19. The seat plate member 20 is constructed between the left and right side frames 19 by fitting both edges on the outside in the chair width direction into the recessed grooves 40 of the left and right side frames 19. A resin spacer 44 having a substantially U-shaped cross section for narrowing the fitting gap with the seat plate member 20 is mounted inside the concave groove 40. In addition, a bulging block 39 that bulges to the lower side of the chair 10 (the lower side of the chair 10 when in the retracted position) is integrally formed at the front end of each side frame 19. The bulge block 39 is configured to fasten and fix an outer edge of the front connecting frame 22 described later in the chair width direction.

  The front connection frame 22 of the seat 12 is overlapped with the front end surfaces of the left and right side frames 19 at both ends on the chair width direction outer side, and shields the front end portion (longitudinal end portion) of the groove 40. The shielding piece 45 (shielding part) is provided. The shielding piece 45 is formed in a flat plate shape with a thin thickness in the front-rear direction. The front connection frame 22 has a connection portion 46 that extends in the chair width direction and connects the left and right shielding pieces 45. The connecting portion 46 has an end wall 48 that is thin in the front-rear direction and continues to the left and right shielding pieces 45, and a rearward extending wall having an inverted triangular shape that bulges from the lower region of the end wall 48 toward the rear side. 47. The cross-sectional shapes of the end wall 48 and the rear extension wall 47 are continuous over the chair width direction.

  The end wall 48 is disposed so that the rear surface 48 a faces the front end surface of the seat plate member 20 in a state where the front connection frame 22 is coupled to the left and right side frames 19. The rear surface 48 a of the end wall 48 abuts on the front end surface of the seat plate member 20, thereby restricting the forward displacement of the seat plate member 20. In the present embodiment, the rear surface 48 a of the end wall 48 constitutes a displacement restricting surface of the seat 12.

The rear extension wall 47 is configured such that the upper surface 47 a abuts the lower surface of the seat plate member 20 in a state where the left and right ends of the front connection frame 22 are coupled to the corresponding left and right side frames 19. Yes. The rear extension wall 47 is positioned on the inner side in the chair width direction than the concave groove 40 of the side frame 19 in a state where the front connection frame 22 is coupled to the side frame 19. Specifically, as shown in FIG. 7, the end surface of the rear extension wall 47 on the outer side in the chair width direction is abutted against the inner surface in the chair width direction of the bulging block 39 of the left and right side frames 19. . The upper surface 47 a of the rear extension wall 47 is formed so as to be substantially continuous with the lower inner surface 40 a in the groove 40 in a state where the front connection frame 22 is coupled to the side frame 19.
In the present embodiment, the rear extension wall 47 constitutes a displacement restricting portion of the drop-out restricting member (front connection frame 22), and the upper surface 47a of the rear extension wall 47 is formed of the drop-out restricting member (front connecting frame) 22) of the load receiving surface constituting member (seat plate member 20).

  The bulging block 39 of the left and right side frames 19 is formed with a bolt insertion hole 41 that communicates from the side surface on the chair width direction outer side to the chair width direction inner side. On the other hand, a screwing hole 43 into which a bolt 42 as a fastening member is screwed is provided on the end surface of the rear extension wall 47 of the front connecting frame 22 on the outer side in the chair width direction. The front connection frame 22 is fastened and fixed to the left and right side frames 19 by tightening the bolts 42 through the bolt insertion holes 41 of the bulging block 39.

Here, the structure of the peripheral region of the second fitting groove 31 of each backrest support portion 13b of the backrest 11 will be described with reference to FIGS.
8-10 is the figure which looked at the backrest 11 part from the back side diagonally downward, and is the figure which showed the mode when removing the 2nd backplate member 17 from the right-and-left backrest support part 13b sequentially. is there.
A notch 50 that forms a part of the second fitting groove 31 is formed on the inner surface in the chair width direction below the connecting portion of the backrest support portion 13b with the connecting frame 15. The cutout portion 50 is formed in a substantially fan-like side view shape with the lower end widening, and the rear side of the backrest support portion 13b is opened. A groove constituting block 51 having a substantially L-shaped side view is attached in the cutout portion 50, and the second fitting having a vertically long rectangular shape in the side view is formed by the notch portion 50 and the groove constituting block 51. A groove 31 is formed.

  The groove constituting block 51 has a rear covering wall 51a extending downward from the upper end portion, and a lower covering wall 51b extending from the lower end of the rear covering wall 51a toward the front surface side. The upper end portion is rotatably connected to the backrest support portion 13b in the notch portion 50. The upper end portion of the rear covering wall 51a is supported by the backrest support portion 13b so as to be rotatable about a rotation shaft 52 along the chair width direction. In the groove constituting block 51, the position where the rear cover wall 51a faces substantially vertically downward and the front end of the lower cover wall 51b contacts the front wall 50a in the notch 50 is a fixed position (see FIG. 8). A position where the rear cover wall 51a and the lower cover wall 51b are rotationally displaced rearward and obliquely upward from the fixed position is defined as a detachment position (see FIG. 10). The second fitting groove 31 includes a front wall 50a and an upper wall (not shown) in the notch 50, a rear covering wall 51a and a lower side of the groove constituting block 51 when the groove constituting block 51 is in a fixed position. It is configured to be surrounded by the covering wall 51b.

  Further, the lower covering wall 51b of the groove constituting block 51 is formed with a bolt insertion hole 53 that penetrates the lower covering wall 51b in the chair width direction. On the other hand, a screw hole 55 into which the bolt 54 is screwed is formed in the bottom wall of the notch 50. In the state where the groove constituting block 50 is in the fixed position, the groove constituting block 51 is attached to the backrest support portion 13b by tightening the tip end portion of the bolt 54 inserted into the bolt insertion hole 53 into the screwing hole 55. It is fixed against.

  When the second back plate member 17 is attached to the left and right corresponding backrest support portions 13b, the second back plate is in a state where the left and right groove constituting blocks 51 are rotated to the detaching position shown in FIG. The edge of the member 17 on the outer side in the chair width direction is disposed in the cutout portion 50 of the corresponding backrest support portion 13b. Thereafter, the left and right groove constituting blocks 51 are rotated to the fixing position shown in FIG. 8 and fixed to the main body portion of the corresponding backrest support portion 13 b by the bolts 54. As a result, both edge portions of the second back plate member 17 on the outer side in the chair width direction are held in a fitted state in the second fitting grooves 31 of the corresponding backrest support portions 13b on the left and right.

On the other hand, when removing the second back plate member 17 from the left and right corresponding backrest support portions 13b, the bolts 54 are removed from the left and right groove constituting blocks 51 at the fixed position, as shown in FIG. The left and right groove constituting blocks 51 are rotated to the detaching position as shown in FIGS. Thereby, the rear lower side of the left and right cutouts 50 is released. Both edge portions of the second back plate member 17 are removed from the corresponding left and right second fitting grooves 31 through a portion opened to the rear lower side of the notch portion 50.
Therefore, when the configuration of the present embodiment is adopted, the second back plate member 17 can be easily detached from the left and right back support portions 13b.

As described above, the backrest 11 of the chair 10 according to the present embodiment has the first back plate member 16 (load receiving surface constituent member) in the first fitting groove 30 (concave groove) of the backrest support portion 13b. In the state where the outer edge in the chair width direction is inserted, a shielding piece 35 (shielding portion) that shields the upper end portion of the first fitting groove 30 and the inner side in the chair width direction from the first fitting groove 30 , A hanging wall 37 (displacement restricting portion) that is in contact with the rear surface of the first back plate member 16 is provided on the upper connecting frame 18 (disengagement restricting member).
For this reason, in the backrest 11 of this embodiment, the edge part of the chair back direction outer side of the 1st backboard member 16 is inserted and locked in the 1st fitting groove 30 of the backrest support part 13b. Thus, the first back plate member 16 can be assembled to the pair of backrest support portions 13b with high support strength. In the case of the backrest 11 of the present embodiment, the hanging wall 37 of the upper connecting frame 18 further abuts on the rear surface intersecting the load input direction of the first backboard member 16, so that the first backrest support portion 13 b has the first The positional deviation and backlash of the first back plate member 16 with respect to the fitting groove 30 can be suppressed.

Further, the seat 12 of the chair 10 according to the present embodiment is recessed in a state in which the edge of the seat plate member 20 (load receiving surface constituent member) on the outer side in the chair width direction is inserted into the recessed groove 40 of the side frame 19. A shielding piece 45 (shielding portion) that shields the front end portion of the groove 40 and a rear extension wall 47 (displacement restriction portion) that contacts the lower surface of the seat plate member 20 on the inner side in the chair width direction than the recessed groove 40 are the front portion. It is provided on the connection frame 22 (disengagement restricting member).
For this reason, in the case of the seat 12 of the present embodiment, the seat plate member 20 is paired by inserting and locking the edge of the seat plate member 20 on the outer side in the chair width direction into the concave groove 40 of the side frame 19. The side frame 19 can be assembled with high support strength. Further, since the rear extension wall 47 of the front connection frame 22 contacts the lower surface intersecting the load input direction of the seat plate member 20, the position shift of the seat plate member 20 with respect to the concave groove 40 of the side frame 19 is not easy. Suppression can be suppressed.

  Further, in the backrest 11 according to the present embodiment, the front surface 37a (contact surface) of the hanging wall 37 of the upper connection frame 18 is the back of the first fitting groove 30 of the backrest support portion 13b in the load input direction. It is formed so as to be substantially continuous with the inner surface 30a on the side (rear side). For this reason, the load input to the first back plate member 16 is supported in a wide area including the inner side surface 30a of the first fitting groove 30 of the backrest support portion 13b and the front surface 37a of the hanging wall 37. be able to. Accordingly, the backrest 11 adopting this configuration can stably support the seated person's load input to the first backboard member 16 over a wide area.

  Similarly, in the seat 12 according to the present embodiment, the upper surface 47a (abutment surface) of the rear extension wall 47 of the front connection frame 22 is the rear side (in the load input direction of the concave groove 40 of the side frame 19 ( It is formed so as to be substantially continuous with the inner side surface 40a on the lower side. For this reason, in the seat 12 adopting this configuration, the load of the seated person input to the seat plate member 20 is stable over a wide area due to the inner surface 40a of the recessed groove 40 and the upper surface 47a of the rearward extending wall 47. Can be supported.

  Furthermore, the backrest 11 according to the present embodiment includes a pair of shielding pieces 35 in which the upper connection frame 18 is coupled to the upper end portions of the left and right backrest support portions 13b, and a coupling portion that couples the pair of shielding pieces 35 to each other. 36, and a hanging wall 37 serving as a displacement restricting portion is provided at the connecting portion 36. For this reason, the hanging wall 37 that restricts the displacement of the first back plate member 16 in the front-rear direction can be rigidly supported on the upper ends of the left and right backrest support portions. Therefore, when this configuration is adopted, the displacement of the first back plate member 16 in the front-rear direction is more reliably regulated by the drooping wall 37, and the first back plate member 16 is more misaligned and rattling. It becomes possible to suppress it stably.

  Similarly, the seat 12 according to the present embodiment includes a pair of shielding pieces 45 in which the front coupling frame 22 is coupled to the front end portions of the left and right side frames 19, and a coupling portion that couples the pair of shielding pieces 45 to each other. 46, and the connecting portion 46 is provided with a rearward extending wall 47 serving as a displacement restricting portion. Therefore, in the seat 12 adopting this configuration, the vertical displacement of the seat plate member 20 can be reliably regulated with high rigidity by the rear extension wall 47, and the positional deviation and rattling of the seat plate member 20 can be further suppressed. It can be stably suppressed.

  Further, in the backrest 11 according to the present embodiment, the lower surface 38a (displacement regulating surface) of the end wall 38 of the upper connection frame 18 is on the inner side in the chair width direction than the first fitting groove 30 of the backrest support portion 13b. , The upper end surface of the first back plate member 16 can be contacted. For this reason, it is possible to suppress the vertical displacement and backlash of the first back plate member 16 by the lower surface 38 a of the end wall 38 of the upper connection frame 18.

  Similarly, in the seat 12 according to the present embodiment, the rear surface 48a (displacement regulating surface) of the end wall 48 of the front connecting frame 22 is located on the inner side in the chair width direction than the concave groove 40 of the side frame 19. The front end surface of the member 20 can be contacted. For this reason, in the seat 12 employing this configuration, it is possible to suppress positional deviation and backlash of the seat plate member 20 in the front-rear direction by the rear surface 48a of the end wall 48 of the front connection frame 22.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above-described embodiment, the rear surface of the first back plate member 16 and the seat plate member 22 from the back side in the load input direction to the upper connection frame 18 on the backrest 11 side and the front connection frame 22 on the seat 12 side. Displacement restricting portions (the hanging wall 37 and the rearward extending wall 47) that are in contact with the lower surface of the upper connecting frame 18 and 22 are provided. It may be in contact with the front surface of the plate member 16 or the upper surface of the seat plate member 22.

  Furthermore, in the above embodiment, the upper frame 18 in which the left and right shielding pieces 35 (shielding portions) are coupled to each other by the connecting portion 36 constitutes the falling-out restricting portion of the backrest 11. The slip-out restricting portion of the backrest 11 having the restricting portion may be configured separately as separate parts corresponding to the upper portions of the left and right backrest support portions 13b, and each may be fixed to the backrest support portion 13b. . Similarly, in the above embodiment, the front frame 22 in which the left and right shielding pieces 45 (shielding portions) are coupled to each other by the connecting portion 46 constitutes the slip-out restricting portion of the seat 12. The removal restricting portion of the seat 12 having the displacement restricting portion may be individually configured as separate parts corresponding to the front end portions of the left and right side frames 19 and fixed to the side frames 19.

In the above embodiment, the configuration of the load support member according to the present invention is employed in both the backrest and the chair, but the configuration of the load support member according to the present invention is either the backrest or the seat. You may make it adopt only.
Furthermore, in the above embodiment, the load support member according to the present invention is applied to a chair installed in a stadium, theater, auditorium, etc., but the load support member according to the present invention is applied in such a manner. The present invention can be applied not only to a chair but also to other chairs such as an office chair having a caster and a conference chair.

10 Chair 11 Backrest (Load support member for chair)
12 seats (load support members for chairs)
13b Back support part (frame member)
16 1st back board member (load receiving surface constituent member)
18 Disengagement restricting member 19 Side frame (frame member)
20 Seat plate member (Load receiving surface component)
22 Disengagement restricting member 30 First fitting groove (concave groove)
30a inner surface 35 shielding piece (shielding part)
36 Connecting part 37 Hanging wall (displacement restricting part)
37a Front surface (contact surface)
38a bottom surface (displacement regulating surface)
40 concave groove 40a inner surface 45 shielding piece (shielding part)
46 Connecting part 47 Rear extension wall (displacement restricting part)
47a Upper surface (contact surface)
48a Rear surface (displacement regulating surface)

Claims (5)

A pair of frame members that are spaced apart in the chair width direction and extend in the longitudinal direction intersecting the load input direction from the seated person;
A load receiving surface constituting member that is installed on the pair of frame members and receives the load of the seated person;
A detachment restricting member fixed to the longitudinal end of the frame member and restricting the load receiving surface constituent member from detaching from the longitudinal end of the frame member,
The frame member has a concave groove extending substantially along the longitudinal direction, and the edge of the load receiving surface constituting member on the outside in the chair width direction is locked in an inserted state,
The drop-out restricting member includes a shielding portion that shields an end portion in the longitudinal direction of the concave groove in a state where the outer edge of the load receiving surface constituting member is inserted into the concave groove. A load support member for a chair, comprising: a displacement restricting portion that abuts against a surface intersecting with a load input direction of the load receiving surface constituting member inside the chair width direction from the groove.   2. The contact surface of the displacement restricting portion with the load receiving surface constituting member is formed so as to be substantially continuous with the inner surface of the concave groove on the back side in the load input direction. Load support member for chairs. The drop-out restricting member includes a pair of shielding portions that closes the longitudinal ends of the concave grooves of the frame members, and a connecting portion that connects the pair of shielding portions,
The chair load support member according to claim 1, wherein the displacement restricting portion is formed in the connecting portion.   The drop-out restricting member has a displacement restricting surface capable of coming into contact with an end surface in a direction along the longitudinal direction of the load receiving surface constituting member, on the inner side in the chair width direction than the concave groove. The load support member for chairs of any one of Claims 1-3.   The chair provided with the load supporting member for chairs of any one of Claims 1-4 as at least one of a backrest and a seat.

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