JP6355238B2 - Chair - Google Patents

Description

  The present invention relates to a chair having an improved structure of a backrest mounting portion.

  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. Many chairs of this type include a back support member such as a back plate that receives a load from the back of the seated person, and a back frame attached to the back of the back support member. And the back support member and the backrest frame are mutually connected by uneven fitting, screwing, or the like (see Patent Document 1).

  The chair described in Patent Document 1 is attached to the left and right side edges of the backrest frame in a state in which the left and right side edges on the upper side of the back support member allow a slight swing displacement by the concave-convex fitting, A tongue-like lower end mounting portion that abuts on the upper surface of the curved portion of the backrest frame extends from the lower end portion of the backrest member. The lower end mounting portion is fixed to the upper surface of the curved portion by screwing in a state where it is in contact with the upper surface of the curved portion of the backrest frame.

Japanese Patent No. 54084633

In the above-described conventional chair, the load input from the seated person to the back support member when the seated person falls into the back support member, the concave and convex fitting parts on both the left and right edges on the upper side, and the lower end mounting part Acts on the screw stopper. In particular, when the backrest frame tends to tilt rearward and downward about the support structure portion, a large load acts on the backrest frame side from the back support member.
Therefore, in the conventional chair, it is important to increase the support rigidity of the portion that supports the back support member. However, in order to increase the support rigidity of the portion that supports the back support member, the thickness of the entire backrest frame is increased. If the thickness is increased, the entire backrest frame may become large and easy to be heavy.

  Therefore, the present invention is intended to provide a chair that can efficiently increase the support rigidity of the portion that supports the back support member.

In order to solve the above problems, a chair according to an invention of this application includes a support structure, a seat supported by the support structure, and a backrest that supports a back of a seated person seated on the seat. A backrest connecting member having one end supported by the support structure and the other end attached to the backrest, wherein the backrest receives a load from the back of the seated person; and A backrest frame attached to a back portion of the back support member, and the backrest connection member has an upper extension portion extending upward, and the backrest frame includes the upper extension portion. Is inserted from below and accommodated, and a front support wall that extends along the front surface of the upwardly extending portion accommodated in the accommodating space and contacts the front surface of the upwardly extending portion. provided, the lower edge portion of the back receiving member, the front support wall Are arranged on the surface, and wherein the front support wall coupled to the overlapping portions of the upper extending portion, of the lower edge of the back receiving member, coupling portions between the overlapping portions, the seat It was made to be provided at a position facing the rear end surface of the head.

Thereby, the upper extension part of the backrest connection member is accommodated in the accommodation space of the backrest frame, and the front support wall of the backrest frame contacts the front surface of the upper extension part of the backrest connection member. In this state, the lower edge portion of the back support member is coupled to the overlapping portion of the front support wall and the upward extending portion . Therefore, the lower edge portion of the back support member is supported by the front support wall and the upward extending portion, which are increased in rigidity by being stacked on each other.

In this case, the front side of the connecting portion between the front support wall and the overlapping portion of the upward extending portion in the lower edge portion of the back support member is covered with the seat. For this reason, in the lower edge portion of the back support member, the connecting portion between the front support wall and the overlapping portion of the upward extending portion becomes difficult to see from the front side, and the appearance quality of the chair is improved.

In order to solve the above problems, a chair according to another invention of this application includes a support structure, a seat supported by the support structure, and a backrest that supports a back of a seated person seated on the seat. A backrest connecting member having one end supported by the support structure and the other end attached to the backrest, wherein the backrest receives a load from the back of the seated person; and A backrest frame attached to a back portion of the back support member, and the backrest connection member has an upper extension portion extending upward, and the backrest frame includes the upper extension portion. Is inserted from below and accommodated, and a front support wall that extends along the front surface of the upwardly extending portion accommodated in the accommodating space and contacts the front surface of the upwardly extending portion. A lower edge portion of the back support member is provided on the front support wall. Are arranged on the surface, and wherein the front support wall coupled to the overlapping portions of the upper extending portion, of the lower edge of the back receiving member, coupling portions between the overlapping portions, the back It was made to provide in the hollow part dented in the back side from the load receiving surface of a receiving member .
In this case, of the lower edge portion of the back support member, the coupling portion between the front support wall and the overlapping portion of the upward extending portion is disposed inside the recessed portion and is difficult to see from the outside. Thereby, the appearance quality of the chair is improved.

The lower edge portion of the back support member is formed by overlapping a bolt that penetrates the upper extension portion and the front support wall in the front-rear direction and is screwed into a nut locked to the lower edge portion. You may make it couple | bond with a part .
In this case, the lower edge portion of the back support member is fixed by receiving a force that is strongly pulled toward the front support wall and the upward extending portion by fastening with a bolt and a nut. Further, the lower edge portion of the back support member is supported by being firmly held between the nut, the front support wall, and the upward extending portion. Therefore, the back support member is supported with higher rigidity.

The front side of the nut may be covered with a cover member that covers the front side of the back support member.
In this case, the front side of the nut is covered with the cover member, and the appearance quality of the chair can be further improved.

A portion of the rear wall of the backrest frame facing the rear surface of the front support wall is connected to the lower edge of the back support member, the front support wall, and the upward extension. A work hole may be provided, and the work hole may be closed by a detachable closing member.
In this case, the lower edge portion of the back support member, the front support wall, and the upper extension portion are joined through the work hole in the back wall of the backrest frame. It is blocked by the blocking member. Therefore, the joining work can be easily performed through the work hole, and after the joining work, the joining portion can be shielded by the closing member to improve the appearance quality of the chair.

Preferably, the working hole is provided in a portion of the rear wall of the lower edge of the backrest frame that bulges most rearward.
In this case, the lower edge portion of the back support member, the front support wall and the upper extension portion can be more easily coupled through the work hole while confirming the work position.

According to the present invention, the lower edge portion of the back support member is supported by the front support wall provided in the backrest frame, and the back that is accommodated in the accommodation space of the backrest frame and abuts the rear surface of the front support wall. Since it is connected to the upper extension part on the side of the twisting connection member, it is possible to efficiently increase the support rigidity of the portion that supports the back support member without causing an unnecessary increase in the thickness of the entire backrest frame.

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. It is a perspective view from the back part slanting upper side of the chair concerning other embodiments 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 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 11b of the back plate 11 is a position facing the rear surface of the seat 4, and when the chair 1 is viewed from the front side, the recessed part 19 and the interior thereof. Is hidden by 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. 2, 3 and the like, a recess 22 for attaching an optional member such as a headrest or a hanger is provided. 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 extends in the upward direction via the inclined connecting portion 45.

  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 upper extending portion 40 of the connecting stay 6 is accommodated in the accommodating space 41 of the backrest frame 12, and the front extending portion 40 of the connecting stay 6 is disposed on the front surface. In a state where the front support wall 28 of the backrest frame 12 is in contact, the lower edge portion 11 b of the back plate 11 is fastened and fixed to the front support wall 28 and the upward extending portion 40. For this reason, the lower edge portion 11b of the back plate 11 is supported by the front support wall 28 and the upward extending portion 40 whose rigidity is increased by overlapping each other.
Therefore, in the chair 1 according to this embodiment, the support rigidity of the portion that supports the back plate 11 can be efficiently increased without causing an unnecessary increase in the thickness of the entire backrest frame 12 or the like.

  Moreover, in the chair 1 which concerns on this embodiment, the bolt fastening part of the front part support wall 28 of the backrest frame 12 and the upper extension part 40 of the connection stay 6 among the lower edge parts 11b of the backplate 11 is used. Since the front side is disposed to face the rear end surface of the seat 4, the recessed portion 19 and the nut 21 of the lower edge portion 11 b of the back plate 11 are hidden by the seat 4 and are difficult to see from the front side. Therefore, in the chair according to this embodiment, the appearance quality can be improved by this configuration.

  Furthermore, in the case of the chair 1 according to this embodiment, the nut 21 for connecting the back plate 11 to the front support wall 28 and the upward extending portion 40 is a front surface of the lower edge portion 11b of the back plate 11. The nut 21 is difficult to see from the side of the back plate because it is provided in the recessed portion 19 that is recessed in the rear side with respect to the general portion of the load receiving surface on the side. Therefore, in the chair 1 which concerns on this embodiment, external appearance quality can be improved also with this structure.

Further, in the case of the chair 1 according to this embodiment, the lower edge portion 11b of the back plate 11 screws the bolt 51 penetrating the upward extending portion 40 and the front support wall 28 into the nut 21 on the back plate 11 side. Thus, since the upper extension portion 40 and the front support wall 28 are coupled to each other, the lower edge portion 11b of the back plate 11 is fastened by the bolt 51 and the nut 21 to the front support wall 28 and the upper extension portion. It is fixed by receiving a force that is strongly attracted to 40. At this time, the lower edge portion 11b of the back plate 11 is firmly held between the nut, the front support wall 28, and the upward extending portion 40 and is stably supported.
Therefore, by adopting the structure of this embodiment, the back plate 11 can be supported by the connecting stay 6 with high rigidity.

  Further, in the chair 1 according to this embodiment, the back plate 11 and the front support wall 28 and the upward extending portion are disposed at a position facing the rear surface of the front support wall 28 in the back wall of the backrest frame 12. 40 is provided with a work hole 52 for fastening a bolt, and the work hole 52 is closed by a closing member 53. Therefore, when the back plate 11 is bolted to the backrest frame 12 and the connecting stay 6, The operation can be easily performed through the hole 52. Moreover, since the work hole 52 is closed by the closing member 53 after the fastening work is completed, the fastening portion cannot be seen from the rear side of the chair 1 through the work hole 52. Therefore, by adopting this structure, the appearance quality of the chair 1 is further improved.

  Furthermore, in the case of this embodiment, since the work hole 52 is provided in the rearmost wall of the lower wall of the back edge of the back frame 12, the operator confirms the fastening position through the work hole 52. However, the back plate 11 can be easily fastened to the front support wall 28 and the upward extending portion 40.

FIG. 19 is a view of a chair 101 according to another embodiment as viewed from the rear upper side.
The chair 101 according to the other embodiment has substantially the same basic configuration as the chair 1 of the above-described embodiment, but the outer edge portion on the front side of the back plate 11 that is the back support member is the cover member 55. Is different from the chair 1 of the above embodiment. In addition, the same code | symbol shall be attached | subjected to the same part as said embodiment, and the redundant description shall be saved.

  The cover member 55 is formed of a sheet-like resin or the like, and is provided with locking portions 55a and 55b that are locked to the upper edge portion 11a and the lower edge portion 11b of the back plate 11 at the upper edge portion and the lower edge portion. It has been. The cover member 55 almost completely covers the front surface side of the back plate 11, and the upper and lower engaging portions 55a and 55b are engaged with the upper edge portion 11a and the lower edge portion 11b of the back plate 11, and the left and right sides. The edge portions 55 c and 55 d are attached to the back plate 11 by being sandwiched between the back plate 11 and the backrest frame 12.

The hollow portion 19 formed on the front surface of the lower edge portion 11b of the back plate 11 and the nut 21 in the hollow portion 19 are completely shielded from the front side by the cover member 55 that covers the front surface side of the back plate 11. Yes.
Therefore, in the case of the chair 101 according to this embodiment, since the hollow portion 19 and the nut 21 are completely invisible from the outside, the appearance quality can be further improved.

  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.

1,101 3 chairs (support structure)
4 seats 5 backrest 6 connection stay (backrest connection member)
11 Back plate (back support member)
11b Lower edge portion 12 Backrest frame 21 Nut 28 Front support wall 34 Lower support wall 40 Upper extension portion 41 Storage space 51 Bolt 52 Work hole 53 Closing member 55 Cover member

Claims (6)

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 has a backrest member that receives a load from the back of the seated person, and a backrest frame that is attached to the back of the backrest member,
The backrest connecting member has an upward extending portion extending upward,
The backrest frame includes an accommodation space in which the upper extension portion is inserted and accommodated from below, and a front surface of the upper extension portion accommodated in the accommodation space, and the upper extension portion A front support wall against which the front surface of the
The lower edge portion of the back support member is disposed on the front surface of the front support wall, and is coupled to the overlapping portion of the front support wall and the upper extension portion ,
Of the lower edge portions of the back support member, a coupling portion with the overlapping portion is provided at a position facing the rear end surface of the seat. 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 has a backrest member that receives a load from the back of the seated person, and a backrest frame that is attached to the back of the backrest member,
The backrest connecting member has an upward extending portion extending upward,
The backrest frame includes an accommodation space in which the upper extension portion is inserted and accommodated from below, and a front surface of the upper extension portion accommodated in the accommodation space, and the upper extension portion A front support wall against which the front surface of the
The lower edge portion of the back support member is disposed on the front surface of the front support wall, and is coupled to the overlapping portion of the front support wall and the upper extension portion,
Of the lower edge portion of the back support member, the connecting portion with the overlapping portion is provided in a recessed portion that is recessed concavely from the load receiving surface of the back support member to the rear side. Chair. The lower edge portion of the back support member is formed by overlapping a bolt that penetrates the upper extension portion and the front support wall in the front-rear direction and is screwed into a nut locked to the lower edge portion. The chair according to claim 1, wherein the chair is coupled to the section. The chair according to claim 3, wherein a front surface side of the nut is covered with a cover member that covers a front surface side of the back support member . A portion of the rear wall of the backrest frame facing the rear surface of the front support wall is connected to the lower edge of the back support member, the front support wall, and the upward extension. The chair according to any one of claims 1 to 4, wherein a work hole is provided and the work hole is closed by a detachable closing member . The chair according to claim 5 , wherein the working hole is provided in a rearmost wall of the lower wall of the lower edge of the backrest frame .

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