JP2015217046A - Chair and chair assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair and a chair assembling method, capable of connecting a backrest to a backrest connection member with high connection strength without causing increase in weight and manufacturing cost, and also easily assembling the backrest to the backrest connection member.SOLUTION: A backrest connection member includes: a rear extension part extended rearward of a seat; and an upper extension part 40 extended while changing in direction from a rear part of the rear extension part to an upper side. The backrest 5 includes: a lower support wall 34 capable of coming into contact with a lower face of the rear extension part; a front support wall 28 connected with a front face of the upper extension part 40; a connection wall 35 connecting the lower support wall 34 and the front support wall 28 so as to form a storage space 41 of the upper extension part 40 on a rear side of the front support wall 28; and an insertion allowance space 37 allowing the upper extension part 40 to be inserted into the storage space 41.

Description

  The present invention relates to a chair having an improved structure of a backrest mounting portion, and a method of assembling the chair.

  A chair used for office work or the like has a support structure connected to the upper part of the pedestal, and a seat that supports the seated person's buttocks and a backrest that supports the back of the seated person are attached to the support structure. ing. In many of this type of chair, a metal backrest connecting member is attached to a support structure, and the backrest is attached to the backrest connecting member by fitting or screwing (see Patent Documents 1 and 2). ).

  In the chair described in Patent Document 1, the backrest connecting member is mainly composed of a frame material having a substantially L shape in side view, and extends backward from the support structure to the rear side of the seat. And an upward extending portion extending in the direction upward from the rear portion of the portion. The chair back includes a back plate that receives a load from the back of the seated person, and a back frame that is a strength member attached to the back of the back plate. In the lower part of the backrest frame, there is a fitting recess that opens downward, into which the upper extension part of the backrest connection member is fitted, and a forward piece that contacts the upper surface of the rearward extension part of the backrest connection member Is provided. In the backrest frame, the fitting recess is fitted to the upper end portion of the upwardly extending portion of the backrest connecting member, the forward piece is brought into contact with the upper surface of the backrest connecting member, and in this state, the vicinity of the fitting portion And the forward piece are screwed to the backrest connecting member.

  In the chair described in Patent Document 2, the backrest connecting member is configured by a substantially L-shaped metal plate in a side view, and extends backward from the support structure to the rear side of the seat; And an upward extending portion extending from the rear portion to the upper side. The backrest of the chair includes a backplate and a backrest frame, and a lower portion of the backrest frame is provided with a recess into which an upwardly extending portion of the backrest connection member is inserted and arranged, and behind the backrest connection member. A bent piece that abuts on the upper surface of the extending portion is extended. In the backrest frame, the front wall of the concave portion at the lower end and the bent piece are brought into contact with corresponding portions of the backrest connecting member, and the contact portions are fastened and fixed by bolts in this state.

JP 2013-094291 A JP 2013-198687 A

In the above-mentioned conventional chair, when the seated person leans back, the load acting on the backrest from the seated person is fixed at the place where the backrest (backrest frame) and the backrest connection member are fixed (fastened with screws or bolts). Act on the location). In particular, in the above-described conventional chair, the backrest and the backrest connecting member are fastened at a plurality of positions spaced apart from each other in the vertical direction. Fastened to the upper surface of the rearward extension of the member. For this reason, when a large load that tilts backward and downward acts on the backrest, the load is applied to the backrest and the connection portion on the lower side of the backrest connection member, and the forward-facing piece and the bent piece on the backrest side are in the back. It acts as a moment to lift away from the upper surface of the rearward extension portion of the squeezing connecting member.
For this reason, in the conventional chair, it is desired to increase the bonding strength between the backrest and the backrest connecting member. However, using a large connecting member to increase the bonding strength increases the weight and the product cost. I will invite you.

  Further, in the above-described conventional chair, a recessed portion that opens downward is provided in a lower portion of the backrest (backrest frame), and when the backrest is attached to the backrest connection member, the upper extension portion of the backrest connection member It is necessary to externally fit a recess on the backrest side to the upper part of the back. At this time, when the front end side of the back extension part of the backrest connecting member is connected in advance to the load support body, the upper extension part rising upward from the rear side of the load support body. It becomes difficult to perform the work of fitting the recess on the backrest side. That is, since the concave part on the backrest side faces downward, the state of the upper extension part and the concave part cannot be directly seen unless the assembling worker bends and looks into from the lower part. For this reason, the operator is forced to have a cramped working posture when assembling the backrest.

  Accordingly, the present invention provides a chair that can be connected to the backrest connection member with high bonding strength without causing an increase in weight or an increase in product cost, and can be easily assembled to the backrest connection member. And a method for assembling the chair.

  In order to solve the above problems, a chair according to the present invention is provided with a support structure, a seat supported by the support structure, a backrest that supports a back of a seated person seated on the seat, and one end of the seat. A backrest connecting member supported by a support structure and having the backrest attached to the other end, wherein the backrest connecting member extends rearward from the support structure to the rear side of the seat. An extension part and an upper extension part extending in a direction upward from the rear part of the rear extension part, and the backrest extends along a lower surface of the rear extension part A lower support wall capable of contacting the lower surface of the rear extension, a front support wall extending along the front surface of the upper extension, and coupled to the front surface of the upper extension; and the front support The lower support wall and the front support so as to form a storage space for the upper extension on the rear side of the wall And an insertion allowance space provided on the upper side of the lower support wall and allowing insertion of the upper extension portion into the accommodation space by tilting the backrest in the front-rear direction. The upper extension portion is coupled to the rear surface of the front support wall in a state where the upper extension portion is inserted into the accommodation space.

Thereby, when assembling the backrest to the backrest connecting member, first, the backrest is inclined forward with respect to the upper extending portion on the backrest connecting member side, so that the upper part of the lower support wall of the backrest is Through the insertion allowance space, the upper end portion of the upper extension portion is inserted into the backrest accommodating space. At this time, by tilting the backrest forward and inserting the upper end portion of the upper extension portion into the accommodation space, the insertion state of the upper extension portion can be visually confirmed relatively easily from the upper side. it can. Next, by tilting the backrest in the standing posture direction from this state, the upper extension part on the backrest connecting member side is completely accommodated in the accommodation space on the backrest side. Thereafter, the front support wall of the backrest is coupled to the front side of the upward extending portion of the backrest connecting member.
When the backrest is attached to the backrest connecting member in this way, the lower support wall is disposed around the lower surface side of the rearward extending portion of the backrest connecting member, and can come into contact with the lower surface of the rearward extending portion. Therefore, for example, when the seated person is leaning back, and a load acts on the back from the back of the seated person, the load acts on the joint between the front support wall and the upward extension part, The upper surface of the lower support wall on the backrest side is in contact with the lower surface of the rear extension part on the backrest connecting member side, and the force in the direction in which the lower support wall is pressed against the lower surface of the rear extension part at the contact part. It will be accepted.

The backrest further includes the back portion with respect to the upper extension portion in a state in which the upper extension portion is inserted into the housing space and relatively moved to a position near a mounting position on the rear surface side of the front support wall. You may make it provide the displacement control part which controls the downward displacement of a twist.
In this case, when the upwardly extending portion of the backrest connecting member is accommodated in the accommodating space and the upwardly extending portion relatively moves to a position near the mounting position on the rear surface side of the front support wall, the downward displacement of the backrest is reduced. Is regulated by the displacement regulating part. As a result, the backrest is temporarily locked to the backrest connecting member, and in this state, the front support wall is coupled to the front surface side of the upward extending portion.

When the backrest is inserted into the housing space and relatively moved to a position near the mounting position on the rear surface side of the front support wall, the backrest fits with the upward extension. It is desirable that a fitting locking portion for restricting the front-rear position of the upward extending portion is provided.
In this case, when the backrest is assembled, by tilting the backrest from the forward tilted state to the standing posture direction, the upper extension portion moves relative to the position near the mounting position on the rear surface side of the front support wall. When the fitting locking portion is fitted to the upper extension portion, the relative positions of the front support wall and the upper extension portion in the front-rear direction are restricted. Therefore, it becomes possible to easily couple the upward extension portion and the front support wall from this state.

Between the back extension part and the upper extension part of the backrest connection member, an inclined connection part in which the angle between the two changes in a multistage manner or in a stepless manner is provided. It is preferable that the connecting wall is provided with an inclined portion substantially along the inclined connecting portion.
In this case, the back extension portion and the upward extension portion of the backrest connection member are connected via the inclined connection portion, and the inclined portion along the inclined connection portion is also provided on the connection wall on the backrest side. Therefore, the backrest can be easily assembled to the backrest connecting member without providing a large concave area below the back of the backrest for avoiding interference during assembly. That is, when the upward extension of the backrest connecting member is bent at a substantially right angle from the rear end of the rearward extension, the backrest is moved from the forward leaning position to the standing posture position when the backrest is assembled. When tilted toward the front, the bent corner portion between the rear extension portion and the upper extension portion easily interferes with the backrest side wall. In this case, in order to avoid this interference on the backrest side, it is necessary to provide a large concave region, but in the embodiment of the present invention, it is not necessary to provide such a large concave region.

In the state where the backrest is attached to the backrest connecting member, the rear extension portion is preferably open on the upper side.
In this case, when the backrest is assembled, the backrest is inclined forward with respect to the upper extension portion on the backrest connection member side, and the upper end portion of the upper extension portion is inserted into the backrest accommodation space. In addition, it is possible to more easily visually check the insertion state of the upper extension part from the upper side.

The upper extension part and the front support wall may be fastened and fixed by first fastening means from the rear side of the upper extension part.
In this case, the upper extension portion and the front support wall receive a fastening load so that they are pressed against each other by the first fastening means in the direction in which the load is received from the back of the occupant. For this reason, rattling is less likely to occur between the upwardly extending portion and the front support wall.

The rear extension part and the lower support wall may be fastened and fixed by a second fastening means from the lower side of the lower support wall.
In this case, the rear extending portion and the lower support wall receive the fastening load so that they are pressed against each other by the second fastening means in the direction of receiving the load in the pressure contact / separation direction when the backrest is tilted. For this reason, it is possible to prevent an abnormal sound such as a hitting sound or a rubbing sound from occurring between the rear extension portion and the lower support wall.

  In order to solve the above problems, the invention of the chair assembling method according to the present invention supports a support structure, a seat supported by the support structure, and a back of a seated person seated on the seat. And a backrest connecting member having one end supported by the support structure and the other end attached to the backrest, wherein the backrest connecting member includes the support structure. A rear extension part extending from the rear side of the seat to the rear side, and an upper extension part extending from the rear part to the upper side of the rear extension part, and the backrest includes the A lower support wall extending along the lower surface of the rear extension portion and capable of contacting the lower surface of the rear extension portion, and extending along the front surface of the upper extension portion and coupled to the front surface of the upper extension portion. A front support wall, and a housing space for the upper extension part on the rear side of the front support wall. A connecting wall that connects the lower support wall and the front support wall, and an upper side of the lower support wall, and the upper extension portion is tilted in the front-rear direction of the backrest. An insertion-permitting space that allows insertion into the housing space, and supporting one end of the backrest connecting member on the support structure, and tilting the backrest from a forward leaning posture toward a standing posture. And changing the upper surface of the lower support wall from a position facing the rear surface of the upper extension portion to a position facing the lower surface of the rear extension portion, and passing the upper extension portion through the insertion allowance space into the housing space. The upper extension part is coupled to the rear surface of the front support wall.

  According to the present invention, the front support wall on the backrest side is coupled to the front surface of the upper extension portion on the backrest connection member side, and the lower support wall on the backrest side extends rearward on the backrest connection member side. Since it is possible to come into contact with the lower surface of the seat, the load input from the back of the seated person to the backrest can be efficiently received at the engaging portion of the backrest and the backrest connecting member. . For this reason, the backrest can be coupled to the backrest coupling member with high coupling strength without causing an increase in weight or an increase in manufacturing cost due to an increase in the size of the coupling member.

  Furthermore, according to the present invention, by tilting the backrest in the standing posture direction from the state in which the backrest is tilted forward, the upward extending portion of the backrest coupling member is inserted into the accommodation space through the insertion-allowing space on the backrest side. In this state, the front support wall on the backrest side can be coupled to the front surface of the upward extending portion on the backrest connection member side. Further, when inserting the upper end portion of the upper extension portion into the accommodation space, the operator can visually check the state of the upper extension portion without tilting the backrest forward by moving the backrest forward. Work can be done easily. Therefore, according to the present invention, the backrest can be easily assembled to the backrest connecting member.

It is a right view of the chair which concerns on one Embodiment of this invention. It is a rear view of the chair concerning one embodiment of this invention. It is sectional drawing corresponding to the III-III cross section of FIG. 2 of the chair which concerns on one Embodiment of this invention. It is an enlarged view of the IV section of FIG. 3 of the chair which concerns on one Embodiment of this invention. It is sectional drawing corresponding to the VV cross section of FIG. 3 of the chair which concerns on one Embodiment of this invention. It is sectional drawing corresponding to the VI-VI cross section of FIG. 3 of the chair which concerns on one Embodiment of this invention. It is sectional drawing corresponding to the VII-VII cross section of FIG. 3 of the chair which concerns on one Embodiment of this invention. It is the perspective view seen from the front lower part side in the state where the backrest and backrest connecting member of one embodiment of this invention were connected. It is the perspective view seen from the front lower part side in the state where the backrest frame of one embodiment of this invention was connected with the backrest connecting member. It is the perspective view which looked at the back board of one Embodiment of this invention from the rear lower part side. It is a right view of the back connection member of one embodiment of this invention. It is the perspective view which looked at the backrest connection member of one Embodiment of this invention from the rear lower part side. It is a disassembled perspective view of the backrest and backrest connection member of one Embodiment of this invention. It is a right view for demonstrating the assembly | attachment process of the chair which concerns on one Embodiment of this invention. It is a right view for demonstrating the assembly | attachment process of the chair which concerns on one Embodiment of this invention. It is a perspective view for demonstrating the assembly | attachment process of the chair which concerns on one Embodiment of this invention. It is a right view for demonstrating the assembly | attachment process of the chair which concerns on one Embodiment of this invention. It is a perspective view for demonstrating the assembly | attachment process 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. In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person seated in a normal posture on the chair is called “left”, and the direction opposite to that is called “right”.

FIG. 1 is a diagram showing the right side surface of the chair 1 according to this embodiment, and FIG. 2 is a diagram showing the back surface of the chair 1. 3 is a vertical cross-sectional view of the chair 1 corresponding to the II-II cross section of FIG.
As shown in these drawings, a chair 1 according to this embodiment includes a leg 2 placed on a floor, a box-like support base 3 installed at the upper end of the leg 2, and a support base 3. A seat 4 that is attached to the upper surface side and supports the seated person's buttocks, a backrest 5 that is disposed on the rear side of the seat 4 and supports the back of the seated person, and a backrest that connects the support base 3 and the backrest 5. A connecting stay 6 that is a connecting member, and an armrest 7 that extends from the left and right side portions of the lower surface side of the seat 4 to the upper side of the seat 4 and on which a seated person's elbow and armtip are placed. In this embodiment, the support base 3 constitutes a support structure that supports loads such as the seat 4 and the backrest 5.

  The leg 2 includes a multi-leg 9 with casters 9a and a pedestal 10 that has a gas spring as a lifting mechanism that stands up from the center of the multi-leg 9 and has a support base 3 at the upper end of the pedestal 10. Is mounted so as to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 10 and a tilt adjustment mechanism for the backrest 5.

4 is an enlarged view of the IV part of FIG. 3, and FIGS. 5, 6, and 7 correspond to the VV, VI-VI, and VII-VII sections of FIG. 3, respectively. It is a figure which shows a cross section.
As shown in these drawings, the backrest 5 includes a back plate 11 that is a back receiving member that receives a load from the back of the seated person, and a back frame 12 that is a strength member attached to the back of the back plate 11, have.

FIG. 8 is a view of the backrest 5 as viewed from the front lower side in a state where the backrest 5 is connected to the connecting stay 6, and FIG. 9 is a view of the backrest frame 12 connected to the connecting stay 6 under the front portion. It is the figure seen from the side. FIG. 10 is a view of the back plate 11 as seen from the lower rear side.
As shown in FIGS. 2, 8, and 10, the back plate 11 is formed of a resin material into a substantially rectangular shape that is vertically long when viewed from the front. Further, as shown in FIGS. 1 and 3, the back plate 11 has a vertical direction so that a position corresponding to the waist of the seated person (a position raised upward by about one third from the bottom) bulges most forward. It is formed to be curved along. The back plate 11 has an upper edge portion 11a and a lower edge portion 11b, and left and right side edge portions 11c and 11d, and a plurality of long holes 93 in a predetermined pattern are formed in the central region. The back plate 11 allows a flexible deformation of the central region when a load is input from the back of the seated person by the plurality of long holes 93.

  As shown in FIGS. 2 and 10, the back plate 11 is formed so that the left-right width of the substantially upper half is wider than the left-right width of the substantially lower half, and the left and right sides of the substantially upper half are substantially parallel. Is formed. As shown in FIGS. 5, 6, and 10, the left and right side edges 11 c and 11 d on the substantially upper half side of the back plate 11 are connected to a first back on the upper side for connection to a backrest frame 12 described later. The engaging concave portion 13 (back receiving side fitting portion) and the lower second locking convex portion 14 (back receiving side fitting portion) are integrally provided. The 1st engagement recessed part 13 and the 2nd latching convex part 14 protrude and are provided in the rear surface side of the left and right side edge parts 11c and 11d.

  As shown in FIG. 5, the first engagement recess 13 is formed in a groove shape having a substantially C-shaped cross section that is continuous for a predetermined length in the vertical direction. The groove of the first engaging recess 13 is open toward the rear side. On the other hand, as shown in FIG. 6, the second locking projection 14 is formed in a cross-sectional shape in which a circular cross-sectional portion is supported by a narrow bar-shaped column portion, and the cross-section continues in a vertical direction for a predetermined length. ing. The first engagement recess 13 and the second engagement protrusion 14 are a first engagement protrusion 15 (supporting member side fitting portion) and a second engagement recess on the back frame 12 side to be described in detail later. 16 (supporting member side fitting portion).

  Further, the left and right side edge portions 11c and 11d of the back plate 11 are gently bent toward the rear side from the outer side in the width direction with respect to the first engaging concave portion 13 and the second locking convex portion 14, and are viewed from the side. Thus, a shielding wall 17 is provided that extends to a position behind the first engaging recess 13 and the second locking projection 14. As will be described later in detail, the shielding wall 17 is formed from the outside of the side portion so that the first engagement concave portion 13 and the second locking convex portion 14 cannot be seen from the outside when the backrest 5 is viewed from the side. It functions to cover up.

  The shielding walls 17 on the left and right sides in the width direction are provided at positions spaced below the upper end of the central region of the back plate 11. In particular, in this embodiment, the upper side of each shielding wall 17 is inclined downward toward the extending direction of the shielding wall 17. Accordingly, the upper end portion of the central region of the back plate 11 is thereby further separated from the extending end of each shielding wall 17.

  As shown in FIGS. 3, 4, 7, 10, etc., a boss 18 that swells in a hemispherical shape on the rear side is integrally formed at the center in the width direction of the lower edge portion 11 b of the back plate 11. Has been. On the front side of the boss portion 18, a hollow portion 19 that is recessed in a concave shape with respect to the general portion of the load receiving surface on the front surface side of the back plate 11 is provided. A bolt insertion hole 20 penetrating in the front-rear direction is formed in the boss portion 18, and a nut 21 is embedded at a position close to the recessed portion 19 side of the bolt insertion hole 20. Moreover, the position where the recessed part 19 is formed in the lower edge part 11 b of the back plate 11 is a position facing the rear surface of the seat 4.

  As shown in FIGS. 2 and 9, the backrest frame 12 is curved in a forward direction after extending downward from the lower end of the frame-shaped frame portion 12A and a substantially pentagonal frame-shaped frame portion 12A when viewed from the front. And a connecting frame portion 12 </ b> B extending. In the backrest frame 12 of this embodiment, as shown in FIG. 2, an inner opening 92 that exposes the front back plate 11 in the rear view is formed in the inner region of the frame-shaped frame portion 12A.

The left and right sides 12Ac, 12Ad of the frame-shaped frame portion 12A extend in the vertical direction so as to be substantially parallel to each other. These side edges 12Ac, 12Ad are arranged to face the rear surfaces of the left and right side edge portions 11c, 11d of the substantially upper half of the back plate 11.
The upper side 12Aa of the frame-shaped frame portion 12A has a central region that is concavely curved rearward with respect to the left and right ends connected to the side sides 12Ac, 12Ad. On the rear surface of the central region in the width direction of the upper side 12Aa, as shown in FIGS. The recess 22 is closed by a lid member 23 when the optional member is not used.

As shown in FIG. 9, on the front side of the left and right sides 12Ac, 12Ad of the frame-shaped frame portion 12A and the connecting frame portion 12B, a pair of outer edge ribs 24 continuous from the side sides 12Ac, 12Ad to the connecting frame portion 12B. Is protruding. The outer edge rib 24 protrudes in a substantially orthogonal direction with respect to the left and right side edges 12Ac, 12Ad and the bottom surface of the connection frame portion 12B, and the strength of the region extending from the side edges 12Ac, 12Ad to the connection frame portion 12B is improved. Is planned.
Also, the left and right side edges 12Ac, 12Ad of the frame-shaped frame portion 12A and the inclined edges 12Ae, 12Af that are continuous with the lower ends of the respective side edges 12Ac, 12Ad protrude toward the front side in the widthwise inner ends. Inner edge ribs 25 (inner shielding walls) that are reinforcing ribs are formed continuously.

  A first engagement that is fitted to the first engaging recess 13 on the upper side of the side edge portions 11c, 11d of the back plate 11 on each front surface on the upper end side of the left and right sides 12Ac, 12Ad of the frame-shaped frame portion 12A. Stop projections 15 are provided so as to be fitted to the second locking projections 14 on the lower side of the side edges 11c, 11d of the back plate 11 on the front surfaces on the lower ends of the left and right sides 12Ac, 12Ad. A second engaging recess 16 is projected.

  As shown in FIG. 5, the first locking projection 15 is formed in a cross-sectional shape in which a circular cross-section is supported by a narrow rod-shaped support, and the cross-section is continuous for a predetermined length in the vertical direction. . On the other hand, as shown in FIG. 6, the second engagement recess 16 is formed in a groove shape having a substantially C-shaped cross section that is continuous for a predetermined length in the vertical direction. The groove of the second engagement recess 16 is open toward the front side.

Here, as shown in FIG. 9, end walls 26 projecting to the front side so as to be substantially orthogonal to the outer edge ribs 24 and the inner edge ribs 25 formed on the left and right side edges 12Ac and 12Ad. Are connected together. Each lower end portion of the first locking projection 15 on the upper side is integrally formed continuously with the upper surface of the end wall 26.
On the other hand, the second engaging recess 16 provided on the lower end side of the left and right side edges 12Ac, 12Ad is arranged on the outer side in the width direction with respect to the outer edge rib 24 as shown in FIGS.

  A connecting block 27 that is also connected to the bottom wall of the connecting frame portion 12B is connected between the pair of outer edge ribs 24 that extend from the frame-shaped frame portion 12A to the front side of the connecting frame portion 12B. The connection block 27 includes a plurality of horizontal ribs (reference numerals omitted) connected to the bottom wall of the connection frame portion 12B and the pair of outer edge ribs 24, and a pair of vertical ribs (reference numerals omitted) connecting the horizontal ribs in the vertical direction. And. As shown in FIGS. 3, 4, 7, etc., an upper extending portion 40 of the connecting stay 6, which will be described later, is accommodated in the center region in the width direction of the connecting block 27 between the bottom wall side of the connecting frame portion 12 B. An accommodation space 41 for placement is formed. Further, a front support wall 28 extending in a plate shape in the vertical direction is provided on the front side of the accommodation space 41 of the connection block 27, and the connection stay 6 is provided above the accommodation space 41 of the connection block 27. A through hole 29 (fitting locking portion) into which the upper end portion of the upward extending portion 40 is fitted is provided.

  As shown in FIG. 4, a pair of upper and lower bolt insertion holes 30 and 31 penetrating in the front-rear direction are formed in the front support wall 28 of the connection block 27. A nut 32 is embedded in the upper bolt insertion hole 30. A hemispherical concave portion 33 into which the boss portion 18 of the lower edge portion 11b of the back plate 11 is fitted is formed at an upper position of the lower side bolt insertion hole 31 in the front surface of the front support wall 28. Yes.

  In the case of this embodiment, the portion that curves and extends to the front side of the lower edge of the connecting frame portion 12B constitutes the lower support wall 34, and between the lower support wall 34 and the front support wall 28 of the connecting frame portion 12B. The part which connects is constituting the connecting wall 35. Side walls 36, 36 extend on both the left and right sides of the lower support wall 34, and a cross-sectional shape of the lower support wall 34 and the side walls 36, 36 on both sides is a substantially U-shape opening upward. In the case of this embodiment, the upper space portion of the substantially U-shaped cross section in which the lower support wall 34 and the side walls 36 on both sides are combined constitutes an insertion allowable space 37.

FIG. 11 is a view showing the left side surface of the connecting stay 6, and FIG. 12 is a view of the connecting stay 6 as viewed from obliquely below the rear.
The connecting stay 6 includes a substantially U-shaped metal front plate 6A that opens upward, and a metal thick rear piece 6B coupled to the upper surface of the front plate 6A. . The front plate 6A has a pair of left and right side walls 42, 42 extending forward, and these side walls 42, 42 are inserted into the support base 3 and connected to a tilting mechanism (not shown) in the support base 3. .

The rear piece 6B includes a base portion 44 coupled to the upper surface of the front plate 6A, an inclined connecting portion 45 extending at an obtuse angle from the rear end position of the base portion 44 obliquely upward to the rear, and an inclined connecting portion 45 And the above-described upward extending portion 40 that bends and extends upward from the rear end position. In the case of this embodiment, the front plate 6A and the base portion 44 of the rear piece 6B constitute a rearward extending portion that extends to the rear side of the seat 4 from the support base 3 that is a support structure. .
Further, in this embodiment, the inclined connecting portion 45 of the rear piece 6B is formed in a flat shape having no bent portion, and the base portion 44 and the upward extending portion 40 are connected in a bent manner in two stages. ing. However, the inclined connecting portion 45 may have a structure in which the base portion 44 and the upper extension portion 40 are bent and connected in three or more stages, and further, the base portion 44 and the upper extension portion are bent in an arc shape. The structure which connects 40 smoothly may be sufficient.

  The inclined connecting portion 45 of the rear piece 6B is formed to have substantially the same width as the base portion 44, but the upward extending portion 40 is formed to be narrower than the base portion 44 and the inclined connecting portion 45. Further, a guide protrusion 46 having a stepped width is formed on the upper end portion of the upward extending portion 40 in a protruding manner. The guide protrusion 46 is fitted into the through-hole 29 in the upper wall of the connection block 27 when the upward extending portion 40 is accommodated in the accommodation space 41 on the backrest frame 12 side. Thus, when the guide protrusion 46 is inserted into the through hole 29, the stepped portion 47 between the guide protrusion 46 and the general portion of the upward extending portion 40 is formed at the position where the guide protrusion 46 is inserted for a predetermined length. 29 abuts the lower edge. In this embodiment, the step 47 and the lower edge of the through-hole 29 constitute a displacement restricting portion that restricts the downward displacement of the backrest 5 when the backrest 5 is assembled.

  Here, the lower support wall 34 at the lower edge of the backrest frame 12 extends along the lower surface of the front plate 6A and the base portion 44, which are the rear extension portions of the connecting stay 6, as shown in FIGS. The front plate 6 </ b> A and the lower surface of the base portion 44 are in contact with each other. In the case of this embodiment, the lower support wall 34 is fastened and fixed from the lower side to the overlapping portion of the front plate 6A and the base portion 44 by two left and right bolts 49, 49 (second fastening means). Yes.

FIG. 13 is a partially exploded view of the joint portion between the backrest 5 and the connecting stay 6.
As shown in FIGS. 3, 4, and 13, the front support wall 28 of the backrest frame 12 extends upward in a state where the upper extension 40 of the connection stay 6 is accommodated in the accommodation space 41. It extends along the front surface of the portion 40. The front support wall 28 is fastened and fixed to the upper extension 40 by two upper and lower bolts 50 and 51 (second fastening means) in a state where the front support wall 28 is in contact with the front surface of the upper extension 40. . The bolt 50 on the upper side is inserted into the bolt insertion hole 30 on the upper side of the upper extension 40 and is screwed into a nut 32 embedded in the bolt insertion hole 30. Further, the lower bolt 51 is inserted into the lower bolt insertion hole 31 of the upper extension 40 and the bolt insertion hole 20 of the back plate 11, and the nut 21 embedded in the bolt insertion hole 20 of the back plate 11. Screwed together.

  A work hole 52 for fastening bolts 50 and 51 is formed at a position facing the rear surface of the front support wall 28 in the rear wall of the lower edge of the backrest frame 12. The work hole 52 is formed in an elliptical shape that is long in the vertical direction, and the rear surface side of the front support wall 28 is opened to the rear side of the chair 1 through the accommodation space 41 of the backrest frame 12. The work hole 52 is formed in a portion of the rear wall of the lower edge of the backrest frame 12 that bulges to the rearmost side. After the fastening work of the bolts 50 and 51 is finished, the work hole 52 is fitted with an oval closing member 53 and is closed by the closing member 53.

  Further, a region of the rear wall of the lower edge of the backrest frame 12 (the connection wall 35) that extends from the lower position of the work hole 52 to the lower support wall 34 is an inclined portion that substantially follows the inclined connection portion 45 of the connection stay 6. 35a.

Next, a method for assembling the backrest 5 of the chair 1 according to this embodiment will be described with reference to FIGS. The armrest 7 shown in FIGS. 1 and 2 is an optional part that is attached according to the user's order. Hereinafter, the description of the assembly of the armrest 7 will be omitted.
The chair 1 according to this embodiment is shipped with the backrest 5, the seat 4, the legs 2, and the like appropriately disassembled, and these are assembled at a store or a user's home.
First, the leg 2, the support base 3, the seat 4, and the connecting stay 6 are appropriately assembled by fitting, bolt fastening, or the like, and the parts on the main body side other than the backrest 5 are integrated as shown in FIG. 14. The In this state, the connecting stay 6 is attached to the support base 3, and the front plate 6A of the connecting stay 6 and the base portion 44 of the rear piece 6B extend substantially horizontally toward the rear of the seat 4, and above the rear piece 6B. The extending portion 40 changes the direction upward via the inclined connecting portion 45 and extends upward.

  Before the backrest 5 is assembled to the connecting stay 6, a back plate 11 is attached to the front side of the backrest frame 12. At this time, first, the corresponding first engaging concave portion 13 on the upper rear surface of the back plate 11 is slid downward from above to the first engaging convex portion 15 on the upper front surface of the frame-like frame portion 12A of the back frame 12. Fit together. Thereafter, the left and right edge portions of the center in the vertical direction of the back plate 11 are pressed against the front surface of the frame-shaped frame portion 12A, and the second engagement recess 16 on the rear surface of the back plate 11 is moved to the front of the frame-shaped frame portion 12A. 2 is fitted to the locking projection 14. As a result, the substantially upper half of the back plate 11 is locked to the frame-shaped frame portion 12 </ b> A of the backrest frame 12. Further, the lower edge portion 11 b of the back plate 11 has a hemispherical boss portion 18 projecting at the center on the rear surface side thereof, and is fitted into the concave portion 33 on the front surface of the front support wall 28 of the backrest frame 12.

  Next, as shown in FIGS. 15 and 16, the backrest 5 is tilted forward with respect to the upward extending portion 40 of the connecting stay 6 attached to the support base 3, and the lower support wall 34 of the backrest frame 12 is moved. The upper end portion of the upper extension 40 is inserted into the accommodation space 41 of the backrest frame 12 through the upper insertion allowance space 37. At this time, since the back frame 12 is guided by the upper extending portion 40 and the inclined connecting portion 45 of the connecting stay 6 on the upper surface of the lower support wall 34 and the side wall 36 on both sides thereof, Can be positioned in the direction and forward.

  At this time, since the upper side of the lower support wall 34 and the inclined portion 35a of the connecting frame portion 12B is released, the operator visually confirms the upper extending portion 40 of the connecting stay 6 from the front upper side, The upper end portion can be easily inserted into the accommodation space 41 of the backrest frame 12. At this time, since the closing member 53 is not attached to the work hole 52 on the rear wall of the lower edge of the backrest frame 12, the upper end portion of the upper extension 40 is in the work hole as shown in FIG. 16. It can be confirmed easily through 52.

  Next, from this state, as shown in FIG. 17, the lower support wall 34 of the backrest frame 12 is inserted into the base portion 44 of the connecting stay 6 and the lower surface side of the front plate 6A, so that the backrest 6 is Tilt in the standing posture direction. As a result, the upwardly extending portion 40 of the connecting stay 6 wraps around the rear side of the front support wall 28 of the backrest frame 12, and the entirety thereof is accommodated in the accommodation space 41 of the backrest frame 12. Thus, when the upwardly extending portion 40 is relatively moved to the vicinity of a predetermined position on the rear surface of the front support wall of the backrest frame 12, the guide protrusion 46 of the upwardly extending portion 40 penetrates the connecting block 27 on the backrest frame 12 side. The hole 29 is inserted.

  When the guide protrusion 46 is fitted into the through hole 29 due to the tilting of the backrest 5 in the standing posture direction, the backrest frame 12 is positioned with respect to the connecting stay 6 in the front-rear direction and the width direction. Further, when the guide protrusion 46 is inserted into the through hole 29 for a predetermined length, the stepped portion 47 of the upper extending portion 40 comes into contact with the lower edge of the through hole 29, whereby the downward displacement of the backrest 5 is changed. Regulated by. At this time, the lower support wall 34 of the backrest frame 12 is in contact with the base portion 44 of the connection stay 6 and the lower surfaces of the front plate 6A, and the front support wall 28 of the backrest frame 12 is above the connection stay 6. It contacts a predetermined position on the front surface of the extension 40. That is, the backrest 5 is temporarily locked in a state of being positioned on the connecting stay 6 at this time.

Thereafter, as shown in FIG. 18, the lower support wall 34 is superposed on the front plate 6 </ b> A of the connecting stay 6 and the base portion 44 by bolts 49, 49 from below the lower support wall 34 of the backrest frame 12. Fasten and fix to the part. Then, the upper extending portion 40 of the connecting stay 6 is fastened and fixed to the front support wall 28 on the backrest frame 12 side with bolts 50 and 51 through the work hole 52 from the rear wall side of the lower edge of the backrest frame 12. To do. At this time, the upper bolt 50 is screwed into the nut 32 embedded in the front support wall 28, and the lower bolt 51 is screwed into the nut 21 embedded in the lower edge portion of the back plate 11. The Therefore, the lower edge portion of the back plate 11 is fastened and fixed to the overlapping portion of the backrest frame 12 and the connecting stay 6 which are strength members by the bolts 51 and the nuts 21.
Thereafter, the work hole 52 at the rear of the backrest frame 12 is closed by the closing member 53 to complete the assembly of the chair 1.

  As described above, in the chair 1 according to this embodiment, the front support wall 28 on the backrest frame 12 side is coupled to the front surface of the upper extension portion 40 of the connecting stay 6 and the lower portion on the backrest frame 12 side. The support wall 34 is coupled to the front plate 6A and the base portion 44 of the connecting stay 6 from the lower side. For this reason, when a seated person leans on the backrest and a load acts on the backrest 5 from the back of the seated person, the load is applied to the front support wall 28 and the upper extension 40 of the connecting stay 6. While acting on the coupling portion, it is received as a force in the pressure contact direction on the lower surface of the front plate 6A and the base portion 44 through the lower support wall 34 that wraps around the front plate 6A and the base portion 44 of the connecting stay 6. Therefore, in the chair 1 according to this embodiment, the load acting on the backrest 5 from the back of the seated person can be efficiently received by the joint portions of the backrest frame 12 and the connecting stay 6 at a plurality of locations, and the fastening member The backrest frame 12 can be coupled to the coupling stay 6 with high coupling strength without causing an increase in weight due to an increase in size or the like and an increase in manufacturing cost.

  In addition, the chair 1 according to this embodiment tilts the backrest 5 in the standing posture direction from the state in which the backrest 5 is tilted forward, thereby allowing the upper extension portion 40 of the connecting stay 6 to be inserted in the backrest frame 12 side. 37 and can be accommodated in the accommodation space 41 in the backrest frame 12, and when the upper extension 40 moves relative to the position near the mounting position on the rear surface side of the front support wall 28, the upper extension When the 40 step portions 47 abut against the lower edge of the through hole 29, the downward displacement of the backrest 5 can be restricted. Therefore, the backrest frame 12 can be easily fastened and fixed to the connection stay 6 in a state where the backrest 5 is temporarily locked to the connection stay 6 in this way.

  In particular, in the case of the chair 1 according to this embodiment, when the backrest 5 is assembled, when the upper extension 40 is relatively moved to a position near the mounting position on the rear surface side of the front support wall 28, the upper extension When the guide protrusion 46 at the upper end of the back is inserted into the through hole 29 on the back frame 12 side, the back frame 12 is positioned relative to the connecting stay 6 in the front-rear direction and the width direction. For this reason, the backrest frame 12 can be fastened and fixed to the connecting stay 6 more easily after this.

  Further, in the chair 1 according to this embodiment, since the insertion allowance space 37 that opens upward is provided above the lower support wall 34 of the backrest frame 12, the upper end portion of the upper extension portion 40 is accommodated. When inserting into the space 41, by tilting the backrest 5 forward, the operator can easily perform the work while visually confirming the state of the upper extension part 40 without going around the lower side. .

  Moreover, in the chair 1 which concerns on this embodiment, between the front plate 6A and the base part 44 of the connection stay 6, and the upward extension part 40, the angle between both changes in multiple steps or in a stepless manner. An inclined connecting portion 45 is provided, and an inclined portion 35 a substantially along the inclined connecting portion 45 is provided on the connecting wall 35 on the back frame 12 side. For this reason, interference between the backrest frame 12 and the connecting stay 6 when the backrest 5 is tilted in the standing posture direction from the forward tilted state without increasing the outer shape of the lower edge portion of the backrest frame 12 is avoided. be able to. Therefore, in the chair 1 according to this embodiment, the shape of the lower edge portion of the backrest frame 12 can be made compact.

  Furthermore, in the chair 1 according to this embodiment, the upper extending portion 40 of the connecting stay 6 and the front support wall 28 on the backrest frame 12 side are bolted by bolts 50 and 51 from the rear side of the upper extending portion 40. Since it is fastened and fixed, the upper extension 40 and the front support wall 28 can be pressed in the same direction as the direction in which the load is received from the back of the seated person. Therefore, it is possible to prevent rattling from occurring between the upper extension 40 and the front support wall 28 when the chair 1 is used.

  Further, in the chair 1 according to this embodiment, the front plate 6A and the base portion 44 of the connecting stay 6 and the lower support wall 34 on the backrest frame 12 side are bolts 49, 49 from the lower side of the lower support wall 34. When the backrest 5 tilts during use, the front plate 6A, the base portion 44, and the lower support wall 34 are placed in front of the lower support wall 34 in a direction in which they are subjected to a pressure contact / separation load. The part plate 6A and the base part 44 can be pressed against each other. Therefore, when the chair 1 is used, it is possible to prevent an abnormal sound such as a hitting sound or a rubbing sound from occurring between the front plate 6A and the base portion 44 and the lower support wall 34.

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, a structure in which a separate back plate 11 is attached to the backrest frame 12 is adopted, but the backrest may be an integral structure as a whole.
Moreover, in the chair 1 of said embodiment, although the lower support wall 34 is couple | bonded by the bolts 49 and 49 from the lower surface side to the back extension part (6A, 44), the lower support wall 34 extends back. If the structure extends around the lower side of the portion (6A, 44) and can contact the lower surface of the rear extension portion (6A, 44) when a load is input, the rear extension portion (6A, 44) is not necessarily provided. It is not necessary to combine them.

1 chair 3 support base (support structure)
4 seats 5 backrest 6 connection stay (backrest connection member)
6A Front plate (back extension)
11 Back plate (back support member)
12 Backrest frame 28 Front support wall 29 Through hole (fitting locking part)
34 Lower support wall 35 Connecting wall 35a Inclined portion 37 Insertion allowable space 40 Upper extension portion 41 Storage space 44 Base portion (rear extension portion)
45 Inclined connecting part 47 Step part (displacement restricting part)
49 bolt (second fastening means)
50, 51 bolt (first fastening means)

Claims (8)

A support structure;
A seat supported by the support structure;
A backrest that supports the back of a seated person seated in the seat;
A backrest connecting member, one end of which is supported by the support structure and the other end is attached to the backrest.
The backrest connecting member is
A rear extension extending from the support structure to the rear side of the seat;
An upper extension part extending from the rear part of the rear extension part in an upward direction and extending,
The backrest is
A lower support wall extending along the lower surface of the rearward extending portion and capable of contacting the lower surface of the rearward extending portion;
A front support wall extending along the front surface of the upper extension portion and coupled to the front surface of the upper extension portion;
A connecting wall that connects the lower support wall and the front support wall so as to form a housing space for the upper extension on the rear side of the front support wall;
An insertion allowance space provided on the upper side of the lower support wall and allowing insertion of the upper extension portion into the accommodation space by tilting the backrest in the front-rear direction;
The chair, wherein the upper extension part is coupled to a rear surface of the front support wall in a state where the upper extension part is inserted into the accommodation space.   The backrest is configured such that the upper extension portion is inserted into the housing space and is relatively moved to a position near the mounting position on the rear surface side of the front support wall, and the backrest with respect to the upper extension portion. The chair according to claim 1, further comprising a displacement restricting portion that restricts downward displacement.   When the backrest is inserted into the housing space and relatively moved to a position near the mounting position on the rear surface side of the front support wall, the backrest fits with the upward extension. The chair according to claim 1 or 2, further comprising a fitting locking portion that regulates a front-rear position of the upward extending portion. Between the back extension part and the upper extension part of the backrest connection member, an inclined connection part is provided in which the angle between the two changes in a multi-step or continuously.
The chair according to any one of claims 1 to 3, wherein the connecting wall of the backrest is provided with an inclined portion substantially along the inclined connecting portion.   The chair according to any one of claims 1 to 4, wherein the back extension portion is open on an upper side in a state where the backrest is attached to the backrest connecting member. .   The said upward extension part and the said front part support wall are fastened and fixed by the 1st fastening means from the back side of the said upward extension part, The Claim 1 characterized by the above-mentioned. The listed chair.   The said back extension part and the said lower support wall are fastened and fixed by the 2nd fastening means from the downward side of the said lower support wall, The any one of Claims 1-6 characterized by the above-mentioned. Chair. A support structure;
A seat supported by the support structure;
A backrest that supports the back of a seated person seated in the seat;
In a method of assembling a chair, comprising: a backrest connecting member, one end of which is supported by the support structure, and the backrest is attached to the other end;
In the backrest connecting member,
A rear extension extending from the support structure to the rear side of the seat;
An upper extension portion extending from the rear portion of the rear extension portion to the upper side and extending, and
For the backrest,
A lower support wall extending along the lower surface of the rearward extending portion and capable of contacting the lower surface of the rearward extending portion;
A front support wall extending along the front surface of the upper extension portion and coupled to the front surface of the upper extension portion;
A connecting wall that connects the lower support wall and the front support wall so as to form a housing space for the upper extension on the rear side of the front support wall;
An insertion allowance space provided on the upper side of the lower support wall and allowing insertion of the upper extension portion into the accommodation space by tilting the backrest in the front-rear direction;
Supporting one end of the backrest connecting member on the support structure;
By tilting the backrest from the forward leaning posture toward the standing posture, the upper surface of the lower support wall is changed from a position facing the rear surface of the upper extending portion to a position facing the lower surface of the rear extending portion. And inserting the upper extension portion into the accommodation space through the insertion allowable space,
A method for assembling a chair, wherein the upper extension part is coupled to a rear surface of the front support wall.

Images