JP6529152B2 - Backrests for chairs and chairs - Google Patents

Description

  The present invention relates to a backrest of a chair and a chair.

  In a chair used for office work etc., a support structure is connected to the upper part of a pillar, and a seat supporting the buttocks of a seated person and a backrest supporting the back of the seated person are attached to the support structure ing. Most of the backrests of this type of chair are provided with a back plate that receives a load from the back of the occupant, and a backrest support member that supports the backplate at the back of the backplate, and the left and right side edges of the backrest support member The portion and the left and right side edge portions of the back plate are mutually connected by the fitting of the support member side fitting portion and the back plate side fitting portion (see Patent Documents 1 and 2).

  In the backrest of the chair described in Patent Document 1, the backrest support member is formed in a rectangular frame shape, and the back plate is attached to the inside of the rectangular frame-like frame portion of the backrest support member. The backrest support member has a cylindrical support member side fitting portion protruding from the inside of the left and right vertical frames, and the left and right side edge portions of the back plate have a concave shape to be fitted with the support member side fitting portion A back plate side fitting portion is formed. In the case of this backrest, the fitting portions of the backboard and the backrest supporting member are assembled in a state in which a slight slip in the rotational direction is allowed, and when a load is input to the backboard from a seated person, Flexural deformation of the central region of the backplate is to be tolerated.

In the backrest of the chair described in Patent Document 2, the outer peripheral edge portion of the substantially rectangular back plate is superimposed on the front surface of the rectangular frame-shaped backrest support member, and the back surface of the side edges on both sides of the back plate On the front side of the left and right sides of the back support member, a hook-shaped support member side fitting that can be engaged with the back plate-side fitting portion is provided. Joints are provided in a protruding manner. Further, at both end portions in the width direction of the left and right sides of the back support member, a pair of positional deviations that restrict positional deviation in the width direction by projecting in the back plate direction and contacting with the convex portions on the back plate side. A regulatory wall is provided in a protruding manner. The back plate side fitting portion and the support member side fitting portion are adapted to be fitted to each other in a longitudinally elongated groove formed between a pair of displacement restricting walls of the back support member.

Patent No. 5132917 gazette JP, 2011-092546, A

  Since the backrest of the chair described in Patent Document 1 is fitted to each other in a state in which the backplate side fitting portion and the support member side fitting portion are exposed to the outside, the backplate and backrest support member are assembled Although the operation is facilitated, it is not desirable from the viewpoint of appearance because the fitting portion is visible from the outside.

  On the other hand, the backrest of the chair described in Patent Document 2 has a structure in which the back plate side fitting portion and the support member side fitting portion are fitted to each other between the pair of displacement restriction walls. Although the fitting portion is not visible from the outside, the back plate side fitting portion must be engaged with the support member side fitting portion in the vertically elongated groove between the pair of displacement regulating walls. Therefore, the assembly work becomes complicated.

  Further, in the backrest of any chair described in Patent Literatures 1 and 2, the back plate side fitting portion is integrally provided in the vicinity of the end portion in the width direction of the back plate, so the central region of the back plate When a load is input from the back of the seated person, the end of the back plate follows the deformation of the central region and is not easily deformed flexibly. For this reason, it is desirable to devise a structure in which stress is easily concentrated at the end of the back plate and stress is more easily released.

  Therefore, according to the present invention, it is possible to shield the fitting portion with the backrest supporting member from the outside without sacrificing the assembling workability, and to prevent the stress concentration on a part of the back plate. It is an attempt to provide a back plate and a chair for longing.

In order to solve the above problems, the back plate of the backrest for a chair according to the present invention is disposed overlapping on the front side of the backrest support member, and the side edges of the backrest support member and the backboard itself in the width direction In the back plate of a backrest for a chair, in which the parts are mutually connected by the fitting of the support member side fitting portion and the back plate side fitting portion, the above-mentioned from the position in the width direction outer side than the back plate side fitting portion There is provided a shielding wall which is bent toward the back support member and shields the back plate side fitting portion from the outer side in the width direction, and the shielding wall is the back plate side fitting portion and the support member side fitting. The end of the shielding wall extends to a position flush with the outer surface of the back side of the back support member , extending along the back and forth direction to the back support member side more than the joint portion, and the end of the shielding wall I made it.

Thereby, the back plate side fitting part is shielded by the shielding wall bent from the width direction outer side position to the back support member side. Therefore, the backrest side fitting part can not be seen directly from the outside, and the appearance is not lost. In addition, when a load is input from the back of the seat occupant to the central region of the back plate, the shielding wall positioned outside in the width direction of the back plate side fitting portion follows the deformation of the central region of the back plate and is flexible. Transform into For this reason, it becomes difficult for stress to concentrate on the end in the width direction of the back plate.
In this case, the back plate side fitting portion and the support member side fitting portion are more reliably shielded by the shielding wall, and no step is generated between the shielding wall and the back side outer surface of the back support member. Thus, the appearance quality can be further improved.

It is desirable that the shielding wall be provided at a position spaced below the upper end position of the widthwise central region of the back plate.
In this case, since the upper end position of the widthwise central region of the back plate is separated from the shielding wall at the widthwise outer position, the width is applied when a load is input from the back of the seat occupant to the widthwise central region of the back plate. Deflection deformation on the upper end side of the direction central region is less likely to be inhibited. Thus, a flexible deformation of the central area of the backplate can be obtained.

It is preferable that the upper end portion of the shielding wall is inclined downward toward the extending direction of the shielding wall.
In this case, when the distance between the upper end of the widthwise central region of the back plate and the extended end of the shielding wall is increased and a load is input from the back of the seat occupant to the widthwise central region of the back plate, Flexible deformation of the widthwise central region of the back plate can be obtained more reliably.

Further, the chair according to the present invention is disposed on the support structure, the backrest support member supported by the support structure, and the front side of the backrest support member, and receives a load from the back of the seated person A chair comprising: a back plate, wherein the backrest supporting member and side edges on both sides in the width direction of the backplate are mutually coupled by the fitting of the support member side fitting portion and the back plate side fitting portion In the backboard, a shielding wall which is bent toward the backrest supporting member from a position outside in the width direction than the backboard side fitting part and shields the backboard side fitting part from the outside in the width direction The shielding wall extends along the back and forth direction from the back plate side fitting portion and the support member side fitting portion back to the support member side, and the end portion of the shielding wall is provided. And extending to a position flush with the outer surface of the back side of the back support member.

The backrest supporting member is provided with an inner opening from which the backboard in front is exposed in a rear view, and is bent toward the backboard from a widthwise inner position with respect to the support member side fitting portion, An inner shielding wall may be provided to shield the support member side fitting portion from the inner side in the width direction.
In this case, since the support member side fitting portion is shielded as viewed from the inner opening side by the inner shielding wall bent from the width direction inner side than the support member side fitting portion, the appearance quality of the chair can be further enhanced. it can.

The inner shielding wall may be constituted by a reinforcing rib along an edge of the inner opening of the backrest supporting member.
In this case, since the inner shielding wall which shields the support member side fitting portion doubles as a reinforcing rib which reinforces the edge of the inner opening of the back support member, it is possible to improve the backrest strength together with the improvement of the appearance quality. Can be

The back support member is provided with a plurality of support member side fitting portions vertically separated from each other, and the inner shielding wall is an end bent in a direction intersecting with the upper and lower extending direction of the inner shielding wall. A part wall may be provided, and at least one of the plurality of support member side fitting parts may be integrally formed continuously with the end wall.
In this case, at least one of the plurality of support member side fitting portions is reinforced by an end wall provided in an end portion of the inner shielding wall so as to be bent in a direction intersecting the inner shielding wall. Therefore, the support strength of the support member side fitting portion can be increased.

The support member side fitting portion continuously formed integrally with the end portion wall corresponds to the corresponding back plate side by displacing the back plate in the vertical direction with respect to the backrest support member. And the end wall is continuously formed on the end of the support member side fitting portion opposite to the side on which the back plate side fitting portion is slidably fitted. You may
In this case, when the back plate and the backrest supporting member are assembled, the load accompanying the slide fitting of the back plate side fitting portion is also supported by the end wall. Therefore, the support rigidity of the support member side fitting portion is enhanced, and the positional accuracy of the support member side fitting portion is also enhanced.

According to the present invention, since the back plate side fitting portion is shielded by the shielding wall which is bent toward the backrest supporting member from the position in the width direction outer side than that, assembling workability of the backplate and backrest supporting member is improved. The appearance quality can be improved by shielding the fitting portion with the backrest supporting member from the outside without sacrifice.
Furthermore, according to the present invention, since the shielding wall is extended from a position outside in the width direction of the back plate side fitting portion of the back plate, a load is input from the back of the seat occupant to the central region of the back plate. Sometimes, the shield wall flexibly follows the deformation of the central region of the back plate, thereby avoiding concentration of stress on the widthwise end of the back plate.

It is a right side view of the chair concerning 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 Drawing 3 of the chair concerning 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 a sectional view corresponding to a VI-VI section of Drawing 3 of a chair concerning one embodiment of this invention. It is a sectional view corresponding to the VII-VII section of Drawing 3 of the chair concerning one embodiment of this invention. It is the perspective view seen from the front lower side in the state which connected the backrest and the backrest connection member of one Embodiment of this invention. It is the perspective view seen from the front lower side in the state which connected the backrest frame of one embodiment of this invention with the backrest connection member. It is the perspective view which looked at the back board of one embodiment of this invention from the back lower side. It is the perspective view which connected the backrest and backrest connection member of the chair which concerns on one Embodiment of this invention, and was seen from the rear upper side. It is a right side view of a back plate of a chair concerning one embodiment of this invention. It is a front view of the backrest frame of the chair concerning one embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described based on the drawings. In the following description, the direction indicated by the arrow FR in the drawing, in which the front of a person sitting in a regular posture on a chair faces, is referred to as "front" and the opposite direction is referred to as "rear". In addition, for "upper", "lower", "left" and "right", the direction pointed by the arrow UP above the person sitting in the chair in the normal posture is "upper" and the opposite direction is " In the figure on the left side of the person sitting in a regular posture, the direction pointed by the arrow LH is called "left", and the opposite direction is called "right".

FIG. 1 is a view showing a right side surface of a chair 1 according to this embodiment, and FIG. 2 is a view showing a back surface of the chair 1. Moreover, FIG. 3 is a longitudinal cross-sectional view corresponding to the II-II cross section of FIG.
As shown in these figures, the chair 1 according to this embodiment includes a leg 2 placed on the floor, a box-shaped support base 3 installed at the upper end of the leg 2, and a support base 3. A seat 4 mounted on the upper surface side to support the buttocks of the seated person, a backrest 5 disposed on the rear side of the seat 4 to support the back of the seated person, and a backrest connecting the support base 3 and the backrest 5 It has a connection stay 6 which is a connection member, and an armrest 7 which extends to the upper side of the seat 4 from both left and right side portions on the lower surface side of the seat 4 and on which a person's elbow and arms are placed. In this embodiment, the support base 3 constitutes a support structure for supporting the load such as the seat 4 and the backrest 5 or the like.

  The leg portion 2 includes a multi-leg 9 with castors 9 a and a pillar 10 which is erected from the central portion of the multi-leg 9 and incorporates a gas spring which is an elevating mechanism. Is mounted rotatably in the horizontal direction. The support base 3 incorporates a lift adjustment mechanism of the pillar 10 and a tilt adjustment mechanism of the backrest 5.

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

FIG. 8 is a view of the backrest 5 connected to the connection stay 6 as viewed from the front lower side, and FIG. 9 is a view of the backrest frame 12 connected to the connection stay 6 in the lower front part It is the figure seen from the other side. 10 is a view of the back plate 11 as viewed from the rear lower side, FIG. 11 is a view of the backrest 5 as viewed from the rear upper side, and FIG. 12 is a view of the right side of the back plate 11. FIG. 13 is a front view of the backrest frame 12 assembled with the connection stay 6.
The back plate 11 is formed of a resin material in a substantially rectangular shape having a vertically long front view. Further, as shown in FIG. 1, FIG. 3, FIG. 12, etc., the back plate 11 bulges most forwardly at the position corresponding to the waist of the seated person (the position raised about one third from the bottom) It is curved and formed along the up and down direction. The back plate 11 has an upper edge 11a and a lower edge 11b and left and right side edges 11c and 11d, and a plurality of elongated holes 93 in a predetermined pattern are formed in the central region. The back plate 11 allows the flexible deformation of the central region when a load is input from the back of the seat occupant by the plurality of elongated holes 93.

  As shown in FIG. 2, FIG. 10, FIG. 11, etc., the back plate 11 is formed such that the left and right width of the substantially upper half is wider than the left and right width of the substantially lower half. It is formed in parallel. As shown in FIG. 5, FIG. 6, and FIG. 10, the first side on the upper side for connecting with the backrest frame 12 described later is provided on the left and right side edges 11c and 11d on the substantially upper half side of the back plate 11. The engagement recess 13 (back receiving side fitting portion) and the lower second locking projection 14 (back receiving side fitting portion) are integrally provided. The first engagement concave portion 13 and the second engagement convex portion 14 are provided so as to protrude on the rear surface side of the left and right side edge portions 11 c and 11 d.

  As shown in FIG. 5, the first engagement recess 13 is formed in a groove shape in which a substantially C-shaped cross section continues in the vertical direction for a predetermined length. The groove of the first engagement recess 13 is open rearward. On the other hand, as shown in FIG. 6, the second locking convex portion 14 is formed in a cross-sectional shape in which the circular cross-section portion is supported by a narrow rod-like column portion, and the cross-section continues in the vertical direction for a predetermined length. ing. The first engagement concave portion 13 and the second engagement convex portion 14 are a first engagement convex portion 15 (support member side fitting portion) on the backrest frame 12 side and a second engagement concave portion which will be described in detail later. It is fitted to each of 16 (support member side fitting part).

  Further, the left and right side edge portions 11c and 11d of the back plate 11 are bent gently rearward from the outer side in the width direction than the first engagement concave portion 13 and the second engagement convex portion 14, and the side view A shielding wall 17 is provided which extends to a position rearward of the first engagement recess 13 and the second locking projection 14. As described in detail later, when the backrest 5 is viewed from the side, the shielding wall 17 is provided from the side outside so that the first engagement recess 13 and the second locking projection 14 can not be seen from the outside. Function to hide.

  Each shielding wall 17 on the left and right in the width direction is provided at a position 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 extension direction of the chair rear side of the shielding wall 17. Between the upper edge 11a of the central region of the back plate 11 and the upper side of each shielding wall 17 are separated so that a substantially V-shaped groove is formed in a side view as shown in FIG. Therefore, the upper end portion of the central region of the back plate 11 is further separated from the extended end of each shielding wall 17, and the flexible deformation of the upper edge 11 a of the back plate 11 is inhibited by the shielding wall 17. There is no

  At the center in the width direction of the lower edge 11b of the back plate 11, as shown in FIGS. 3, 4, 7, 10, etc., a boss 18 which bulges in a hemispherical shape on the rear side is integrally formed. It is done. On the front surface side of the boss portion 18, a recessed portion 19 is provided which is recessed with respect to a general portion of the load receiving surface on the front surface side of the back plate 11. 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. Further, the position at which the hollow portion 19 of the lower edge portion 11 b of the back plate 11 is formed is a position facing the rear surface of the seat 4.

  The backrest frame 12 extends downward from the lower end of the substantially pentagonal frame-shaped frame portion 12A in a front view downward and the frame-shaped frame portion 12A as shown in FIG. 2, FIG. 9, FIG. And a connecting frame portion 12B that curves and extends forward. In the backrest frame 12 of this embodiment, as shown in FIG. 2, an exposed inner opening 92 of the front back plate 11 in a 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-like frame portion 12A extend in the vertical direction so as to be substantially parallel to each other. The side edges 12Ac and 12Ad are disposed to face the rear surfaces of the left and right side edge portions 11c and 11d of the substantially upper half portion of the back plate 11, respectively.
An upper side 12Aa of the frame-like frame portion 12A is concavely curved in the central region to the rear side with respect to left and right ends connected to the side sides 12Ac and 12Ad. On the rear surface of the central region in the width direction of the upper side 12Aa, as shown in FIG. 2, FIG. 3, etc., a recess 22 for attaching an optional member such as a headrest or a hanger is provided. The recess 22 is closed by the lid member 23 when the option member is not used.

As shown in FIG. 9, on the front side of the left and right sides 12Ac, 12Ad of the frame-like frame portion 12A and the connecting frame portion 12B, a pair of outer edge ribs 24 continuous from the sides 12Ac, 12Ad to the connecting frame portion 12B. Is projected. The outer edge rib 24 protrudes in a direction substantially orthogonal to the left and right sides 12Ac, 12Ad and the bottom surface of the connecting frame portion 12B, and improves the strength of the region extending from each side 12Ac, 12Ad to the connecting frame portion 12B. Is planned.
Further, the end portions on the inner side in the width direction of the left and right sides 12Ac, 12Ad of the frame portion 12A and the inclined sides 12Ae, 12Af continuous with the lower ends of the sides 12Ac, 12Ad project toward the front side. An inner edge rib 25 (inner shielding wall) which is a reinforcing rib is continuously formed.

  The first engaging recess 13 is fitted to the first engagement recess 13 on the upper side of the side edge 11c or 11d of the back plate 11 on each front surface on the upper end side of the left and right side 12Ac or 12Ad of the frame-like frame portion 12A. Retaining convex portions 15 are provided in a protruding manner, and are fitted to the second engaging convex portions 14 on the lower side of the side edge portions 11c and 11d of the back plate 11 on the lower front sides of the left and right side sides 12Ac and 12Ad. A second engagement recess 16 is provided in a protruding manner.

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

Here, as shown in FIG. 9, at the upper end portions of the outer edge rib 24 and the inner edge rib 25 formed on the left and right side edges 12Ac, 12Ad, an end portion wall 26 projecting forward so as to be substantially orthogonal thereto. Are linked together. Each lower end portion of the upper first locking projection 15 is integrally formed continuously with the upper surface of the end wall 26.
On the other hand, as shown in FIGS. 6 and 9, the second engagement recess 16 provided on the lower end side of the left and right sides 12Ac and 12Ad is disposed on the outer side in the width direction than the outer edge rib 24.

  Between a pair of outer rims 24 extending from the frame-like frame portion 12A to the front side of the connecting frame portion 12B, a connecting block 27 coupled to the bottom wall of the connecting frame portion 12B is coupled. The connection block 27 includes a plurality of horizontal ribs (reference numeral 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 numeral omitted) connecting the horizontal ribs in the longitudinal direction. And have. In the central area in the width direction of the connection block 27, as shown in FIG. 3, FIG. 4, FIG. 7, etc., the upper extension 40 of the connection stay 6 described later is accommodated between it and the bottom wall side of the connection frame 12B. A housing space 41 for arrangement is formed. 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 on the upper side of the accommodation space 41 of the connection block 27. A through hole 29 (fitting locking portion) into which the upper end portion of the upper 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 is formed in the front support wall 28 of the connection block 27. A nut 32 is embedded in the bolt insertion hole 30 on the upper side. A hemispherical recess 33 into which the boss 18 of the lower edge 11b of the back plate 11 is fitted is formed at an extended upper position of the lower bolt insertion hole 31 in the front surface of the front support wall 28 There is.

  In the case of this embodiment, the forwardly curved portion of the lower edge of the connection frame portion 12B constitutes the lower support wall 34, and between the lower support wall 34 and the front support wall 28 of the connection frame portion 12B. The portion connecting the two forms the connecting wall 35. Side walls 36, 36 are extended on the left and right sides of the lower support wall 34, and the cross sectional shape of the lower support wall 34 and the side walls 36, 36 on both sides is substantially U-shaped opening upward. In the case of this embodiment, the space portion on the upper side of the substantially U-shaped cross section in which the lower support wall 34 and the side walls 36 and 36 on both sides are combined, constitutes the insertion permitting space 37.

  The connection stay 6 includes a substantially U-shaped metal front plate 6A opening upward, and a metal thick rear piece 6B coupled to the upper surface of the front plate 6A. . A pair of left and right side walls of the front plate 6A extends forward, and these side walls 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 connection portion 45 extending at an obtuse angle to the upper rear at a rear end position of the base portion 44, and an inclined connection portion 45. And the above-mentioned upper extending portion 40 which 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 rear extension portion extending from the support base 3 which is a support structure to the rear side of the seat 4 . Further, in this embodiment, the sloped connection portion 45 of the back piece 6B is formed in a flat shape without a bent portion, and the base portion 44 and the upper extension portion 40 are connected in a two-step bent shape. ing. However, the inclined connection 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 steps, and further curved in an arc shape to be the base portion 44 and the upper extension portion 40 may be connected smoothly.

  The inclined connection portion 45 of the rear piece 6B is formed to have substantially the same width as the base portion 44, but the upper extension portion 40 is formed to have a narrower width than the base portion 44 or the inclined connection portion 45. Then, at the upper end portion of the upper extending portion 40, a guide protrusion 46 whose width is narrowed in a step-like manner is provided in a protruding manner. The guide projection 46 is fitted into the through hole 29 on the upper wall of the connection block 27 when the upper extension 40 is placed in the accommodation space 41 on the back frame 12 side. Thus, when the guide protrusion 46 is fitted into the through hole 29, the step between the guide protrusion 46 and the general portion of the upper extension 40 is the through hole 29 when the guide protrusion 46 is fitted into a predetermined length. Abuts the lower edge of the

  Here, the lower support wall 34 at the lower edge of the backrest frame 12 is along the lower surface of the front plate 6A and the base portion 44, which are the rearward extension portions of the connection stay 6, as shown in FIGS. Extends forward and abuts against the lower surface of the front plate 6A and the base portion 44. In the case of this embodiment, the lower support wall 34 is fastened and fixed to the overlapping portion of the front plate 6A and the base portion 44 from the lower side by two bolts 49 and 49 on the left and right.

  The front support wall 28 of the backrest frame 12, as shown in FIG. 3, FIG. 4, etc., shows that the upper extension 40 of the connection stay 6 is accommodated in the accommodation space 41. Extends along the front of the The front support wall 28 is fastened and fixed to the upper extension 40 by two upper and lower bolts 50 and 51 in a state in which the front support wall 28 abuts on the front surface of the upper extension 40. The upper side bolt 50 is inserted into the bolt insertion hole 30 on the upper side of the upper extension 40 and screwed into a nut 32 embedded in the bolt insertion hole 30. The lower side bolt 51 is inserted into the bolt insertion hole 31 on the lower side of the upper extension 40 and the bolt insertion hole 20 of the back plate 11, and is embedded in the nut 21 embedded in the bolt insertion hole 20 of the back plate 11. Screwed together.

  In the rear wall of the lower edge of the backrest frame 12, at a position facing the rear surface of the front support wall 28, a working hole 52 for performing fastening work of the bolts 50, 51 is formed. The working hole 52 is formed in an oval shape which is long in the vertical direction, and the rear 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 working hole 52 is formed in the rearmost bulging portion of the rear wall of the lower edge of the backrest frame 12. After completing the fastening operation of the bolts 50, 51, the working hole 52 is fitted with the elliptical closing member 53 and closed by the closing member 53.

  Further, in the rear wall of the lower edge (connection wall 35) of the backrest frame 12, a region extending from the lower position of the working hole 52 to the lower support wall 34 is an inclined portion substantially along the inclined connection portion 45 of the connection stay 6. It is said to be 35a.

Before attaching the backrest 5 to the connection stay 6, the backplate 11 is attached to the front side of the backrest frame 12. At this time, first, slide the corresponding first engagement recess 13 on the back surface upper portion of the back plate 11 downward from above onto the first locking projection 15 on the front surface upper portion of the frame-like frame portion 12A of the backrest frame 12 While fitting.
At this time, since the lower end of the first locking convex portion 15 on the backrest frame 12 side is integrally formed continuously with the end wall 26 connected to the inner edge rib 25 and the outer edge rib 24, the above-mentioned slide The load acting on the first locking projection 15 at the time of fitting is received by the end wall 26 with high rigidity. Further, since the first locking convex portion 15 is integrally and continuously formed with the end wall 26, in the above-described slide fitting, the back plate 11 and the backrest frame 12 are accurately positioned in the vertical direction. can do.

  After that, the left and right edges of the vertical center of the back plate 11 are pressed against the front surface of the frame portion 12A, and the second engagement recess 16 on the back surface of the back plate 11 2 Fit into the locking projection 14. As a result, the substantially upper half of the back plate 11 is locked to the frame-like frame portion 12A of the backrest frame 12. In the lower edge portion 11 b of the back plate 11, the hemispherical boss 18 provided at the center on the rear surface side is fitted into the recess 33 on the front surface of the front support wall 28 of the back frame 12. The lower edge portion 11b of the back plate 11 is screwed onto the back surface side of the upper extension portion 40 by screwing the bolt 51 to the nut 21 in the boss portion 18 and fixed together to the back frame 12 and the connection stay 6 Ru.

  As described above, in the chair 1 according to this embodiment, the first engagement concave portion 13 and the second locking convex portion 14 protruding rearward from the side edge portions 11 c and 11 d of the back plate 11 Since the outside in the width direction is shielded by the shielding wall 26 bent to the rear side from the width direction outside position than the width direction, the fitting portion is externally without sacrificing the assembling workability of the back plate 11 and the backrest frame 12 You can hide it to improve the appearance quality.

Further, in the chair 1 according to this embodiment, since the shielding wall 26 is continuously extended from the position in the width direction outer side than the first engagement concave portion 13 and the second locking convex portion 14 of the back plate 11, When a load is input from the back of the seat occupant to the central region of the back plate 11, the side edges 11c and 11d of the back plate 11 including the shielding wall 17 easily deform flexibly following the deformation of the central region. .
Therefore, in the chair 1 according to this embodiment, even when a large load is input to the central region of the back plate 11, stress is less likely to be concentrated at the end in the width direction of the back plate 11. Therefore, in the chair 1 of this embodiment, the durability of the back plate 11 can be enhanced.

  Further, in the chair 1 according to this embodiment, the shielding walls 17 of the side edge portions 11c and 11d of the back plate 11 are provided at positions lower than the upper end position of the width direction central region of the back plate 11. Since the load is input from the back of the seat occupant to the central area in the width direction of the back plate 11, bending deformation on the upper end side of the central area in the width direction is less likely to be inhibited by the bent shielding wall 17. Therefore, in the chair 1 of this embodiment, a flexible deformation of the central region of the back plate 11 can be obtained.

  Furthermore, in the case of the chair 1 according to this embodiment, the upper end portions of the shielding walls 17 of the side edge portions 11c and 11d of the back plate 11 are inclined downward toward the extending direction of the shielding walls 17, and a side view Between the upper edge 11a and the side edges 11c and 11d of the back plate 11 so that a substantially V-shaped groove is formed. Therefore, the distance between the upper end of the widthwise central region of the back plate 11 and the extended end of each shielding wall 17 is increased, and a load is input from the back of the seated person to the widthwise central region of the back plate 11 When this happens, flexible deformation of the widthwise central region of the back plate 11 can be obtained more reliably.

  Moreover, in the case of the chair 1 according to this embodiment, the positions where the shielding walls 17 of the side edge portions 11c and 11d of the back plate 11 are flush with the outside surface of the back side of the frame 12A. It is extended to. Therefore, the shield wall 17 can more reliably shield the first engagement recess 13 and the first locking projection 15, and the second locking protrusion 14 and the second engagement recess 16 by the shielding wall 17. While being possible, a level | step difference will not arise between the extension end of shielding wall 17 and frame-like frame part 12A. Therefore, the appearance quality of the chair 1 can be improved by adopting the structure of this embodiment.

  Further, in the chair 1 according to this embodiment, the inner edge rib 25 bent toward the back plate 11 side in the width direction inner position than the first engagement convex portion 15 and the second engagement concave portion 16 of the backrest frame 12. Thus, the fitting portion between the frame-like frame portion 12A of the backrest frame 12 and the back plate 11 can be covered with the inner edge rib 25 from the direction of the inner opening 92. Therefore, the appearance quality of the chair 1 can be further improved by adopting the structure of this embodiment.

  In particular, in the case of this embodiment, the inner edge rib 25 also serves as a reinforcing rib that reinforces the inner edge portion of the frame-like frame portion 12A of the backrest frame 12. Therefore, the strength of the backrest frame 12 is improved along with the improvement of the appearance quality. Can be

  Furthermore, in the chair 1 according to this embodiment, the upper end portion of the inner edge rib 25 of the backrest frame 12 is provided with an end wall 26 intersecting the extension direction of the inner edge rib 25, and the upper side of the backrest frame 12 The first locking projection 15 is integrally formed continuously with the end wall 26. For this reason, the vicinity part of the 1st latching convex part 15 is reinforced by the inner edge rib 25 which doubles as a reinforcement rib. Therefore, by adopting this structure, the support strength of the vicinity of the first locking convex portion 15 can be increased.

Furthermore, in the case of this embodiment, by displacing the back plate 11 downward with respect to the backrest frame 12, the first engagement recess 13 on the backplate 11 side is the backrest first engagement convex portion on the frame 12 side. The end wall 26 supporting the first locking convex portion 15 on the backrest frame 12 side is configured to be slide-fitted to the rear frame 12. The end wall 26 of the first locking convex portion 15 is on the back plate 11 side The first engagement recess 13 is continuously formed on the end opposite to the slide-fitted side of the first engagement recess 13. Therefore, when the back plate 11 and the backrest frame 12 are assembled, the load accompanying the slide fitting can be rigidly received by the end wall 26. Therefore, by adopting this structure, the support rigidity of the first locking convex portion 15 can be enhanced, and the positional accuracy of the first locking convex portion 15 can also be enhanced.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention.

1 chair 3 support base (support structure)
5 backrest 11 backboard 12 backrest frame (backrest support member)
13 1st engagement recess (back plate side fitting part)
14 2nd locking convex part (back plate side fitting part)
15 1st locking convex part (supporting member side fitting part)
16 Second engagement recess (support member side fitting part)
17 Shielding wall 25 Inner rib (reinforcing rib, inner shielding wall)
26 end wall 92 inner opening

Claims (8)

The side edges of the back support member and the back plate itself on both sides in the width direction are arranged by the fitting of the support member side fitting portion and the back plate side fitting portion. In the back of the back of the chair that is connected to each other,
A shielding wall is provided which is bent toward the backrest supporting member from a position outside in the width direction with respect to the backplate side fitting portion to shield the backplate side fitting portion from the outside in the width direction.
The shielding wall, the back plate side fitting portion, and wherein the supporting member-side fitting backrest support member side than the portion extending along the longitudinal direction, and an end portion of the shielding wall, the back A back plate for a chair backrest, which extends to a position flush with the outer surface on the back side of the turning support member.   The back plate for a chair backrest according to claim 1, wherein the shielding wall is provided at a position spaced below the upper end position of the widthwise central region of the back plate.   The back plate of a chair backrest according to claim 2, wherein the upper end portion of the shielding wall is inclined downward toward the extending direction of the shielding wall. A support structure,
A backrest support member supported by the support structure;
And a back plate which is disposed on the front side of the back support member and receives a load from the back of the seat occupant.
In the chair in which the side edges of the back support member and the width direction both sides of the back plate are mutually coupled by the fitting of the support member side fitting portion and the back plate side fitting portion,
The back plate is provided with a shielding wall that is bent toward the back support member from the outer side in the width direction than the back side fitting portion to shield the back side fitting portion from the outside in the width direction. ,
The shielding wall, the back plate side fitting portion, and wherein the supporting member-side fitting backrest support member side than the portion extending along the longitudinal direction, and an end portion of the shielding wall, the back A chair characterized in that the chair extends to a position flush with an outer side surface of the back side of the turning support member. The backrest supporting member is provided with an inner opening from which the backboard in front is exposed in a rear view, and is bent toward the backboard from a widthwise inner position with respect to the support member side fitting portion, The chair according to claim 4 , further comprising an inner shielding wall that shields the support member side fitting portion from the inner side in the width direction. The chair according to claim 5 , wherein the inner shielding wall is constituted by a reinforcing rib along an edge of the inner opening of the backrest supporting member. The back support member is provided with a plurality of support member side fitting portions vertically separated from each other,
The inner shielding wall is provided with an end wall which is bent in a direction intersecting with the vertical extension direction of the inner shielding wall,
The chair according to claim 5 or 6 , wherein at least one of the plurality of support member side fitting parts is integrally formed continuously with the end wall. The support member side fitting portion continuously formed integrally with the end portion wall corresponds to the corresponding back plate side by displacing the back plate in the vertical direction with respect to the backrest support member. The parts are slide fitted
The end wall is formed continuously to an end portion of the support member side fitting portion on the side opposite to the slide-fitted side of the back plate side fitting portion. A chair according to claim 7 .

Images