JP2010063831A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair in which a backplate is supported by a back support rod in a mode where the upper end side thereof can be displaced in right and left directions relative to the lower end side and disadvantage does not happen in the attaching portion of a backplate to the back support rod even in the case where the backplate is displaced in the right and left directions. <P>SOLUTION: The chair 100 constituted by having the back support rod 51 and the backplate 61 directly or indirectly supported by the back support rod 51 such that the upper end side can be displaced in the right and left directions relative to the lower end side is characterized in that the backplate 61 has a backplate body 61a directly or indirectly supported by the distal end portion of the back support rod 51 and a lower end attaching portion 61b arranged in the lower end portion of the backplate body 61a and secured to the proximal end side of the back support rod 51 using screws B2, while the lower end attaching 61b is protruded out in a direction crossing the lower end portion of the backplate body 61a, and in that the lower end attaching portion 61b is attached to the backplate rod 51 by the screws B2 arranged orthogonally to the protruding out direction of the lower end attaching portion 61b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a chair having a back plate supported by a back support rod.

Conventionally, as a structure of the back plate supported by the back support rod, a chair that has a mounting portion protruding from the back plate at the lower portion of the back plate, and is supported by the back support rod through the mounting portion is considered. ing. At that time, in order to reliably prevent and support the back plate, a screw or the like is passed through the back support rod and the mounting portion, and the back support rod and the mounting portion are fixed with a screw or the like. As a method of fixing with screws, a method of stopping in the vertical direction with respect to the mounting portion and the back plate from the front side to the back side of the back support rod as in Patent Document 1 is known.
JP 2004-129966 A

  However, if it is like this, the screw can effectively exert the stopping force against the back plate in the front-rear direction, but it is slight if the back plate moves in the left-right direction However, there is a possibility that the force in the rotation direction is repeatedly applied to the screw, and the screw is easily loosened. For example, when a seated person is seated and the body is torsioned toward the right rear, the upper part of the back board is the lower part of the back board. When the body slides slightly to the right of the attached part and conversely turns to the left rear, the upper part of the back plate means to slide slightly to the left of the attached part below.

  As described above, when the back plate slides to the left and right with respect to the attachment portion, a force perpendicular to the axial direction of the screw, that is, a direction in which the screw loosens with respect to the screw head may be applied. Therefore, there is a possibility that the screw will loosen if used for a long period of time, and it is necessary to take measures to prevent loosening such as screw lock so that the screw will not loosen even if it is used for a long period of time.

  Therefore, the present invention focuses on the above-described problems, and the back plate is supported on the back plate in such a manner that the upper end side thereof can be displaced left and right with respect to the lower end side, and the back plate extends in the left-right direction. It is an object of the present invention to provide a chair that is less likely to cause inconvenience in the mounting portion of the back plate with respect to the back support rod even in the case of displacement.

  The chair according to the present invention made to solve the above problems is directly or indirectly supported by the back support rod and the back support rod in such a manner that the upper end side can be displaced left and right with respect to the lower end side. The back plate is provided at a lower end portion of the back plate body and the back plate body supported directly or indirectly on the front end portion of the back support rod. A lower end mounting portion fixed to the base end side of the back support rod using a fastening tool, and projecting the lower end mounting portion in a direction intersecting with the lower end portion of the back plate body, The lower end attaching portion is attached to the back support rod by a fastening device arranged orthogonal to the protruding direction of the lower end attaching portion.

  In such a case, since the axial direction of the fastening device is not perpendicular to the back plate, the fastening device is loosened with respect to the head of the fastening device even when the back plate is displaced in the left-right direction. Directional force is not applied, and it is possible to suppress loosening and disengagement of the fasteners to the back plate of the back plate gradually.

  Here, the fastening tool is a concept including a screw, a bolt and a nut, and a rivet.

  Also, as the structure of the back plate supported by the back support rod in such a manner that the upper end side can be displaced to the left and right with respect to the lower end side, a pair of side end attachment portions is provided on the left and right side portions of the back plate body. It is preferable that the side end mounting portion is indirectly supported by the back support rod through an elastic reed. In such a case, in addition to the lower end mounting portion described above, the back plate is fixed at three points in total on the upper left and right sides of the back plate. Because it communicates to some extent and is linked to a good condition, it is deformed to tilt to the left and right.

  Furthermore, as an example of the elastic recumbent when the back plate is supported in a mode that can be displaced left and right, the middle part is supported by the back support rod and the arm part is extended to the left and right, It is preferable that the extended ends of the arm portions are respectively attached to the side end attaching portions of the back plate. If it is such, the elastic loop structure made from a backplate and an elastic recumbent will become large, and an elastically deformable area | region can be increased.

  In addition, as the back support rod structure of the chair suitable for attaching the back plate, it has branch saddle portions that are separated from each other in the right and left, and the two branch saddle portions are provided at two intermediate portions of the elastic recumbent portion. If the provided attachment portions are respectively attached, the movement of the back support rod and the elastic recumbent can be interlocked, and the elastic recumbent has attachment portions at the base ends of the left and right arm portions. As long as each is provided and the two attachment portions are elastically connected by a connecting portion, the movements of the back plate, the back support rod, and the elastic recumbent can be interlocked.

  Further, as a structure of the elastic reed suitable for attaching the back plate, a structure in which the arm part, the attaching part, and the connecting part are integrally formed of a synthetic resin is preferable. With such a configuration, the number of parts and the number of processing steps can be reduced, and the characteristics can be designed so that the width, thickness, and planar shape of the elastic reed are partially different.

  According to the present invention, the back plate is supported on the back surface in such a manner that the upper end side thereof can be displaced left and right with respect to the lower end side, and even when the back plate is displaced in the left and right direction, It is possible to provide a chair that is less likely to cause inconvenience in the attachment portion to the back support rod.

  Hereinafter, an embodiment in which the present invention is applied to a synchro tilt type office rotary chair 100 will be described with reference to the drawings.

  As shown in FIG. 1 to FIG. 3, the chair 100 includes a leg 1, a support base 2 that is supported on an upper portion of the leg 1 and can be turned horizontally, and a seat 3 that is disposed on the support base 2. A seat 4 held by the seat receiver 3, an armrest 10 provided extending from the lower side of the seat receiver 3 to the left and right, and a back support body 5 provided on the support base 2 so as to be able to tilt backward. A backrest 6 attached to the back support 5 is provided.

  The leg 1 includes a leg base 11 and a leg support 12 provided at the center of the leg base 11. The leg base 11 is formed by radially projecting leg blades 11b from a hub 11a provided at the center, and a caster 11c is provided at the tip of the leg blade 11b. The leg struts 12 are mainly composed of gas springs, and are normal ones that can elastically extend in the vertical direction and can be locked at a desired position.

  The support base 2 includes a housing 21 attached to an upper end portion of the leg support 12, a main shaft 22 that is rigidly connected to the housing 21 and supports the back support 5 so as to be able to tilt backward, and the housing 21 A tilting reaction force generation mechanism (not shown) is provided that generates a repulsive force with respect to the backward tilting operation of the back support 5. Since the tilt reaction force generation mechanism is a normal one using a coil spring, a gas spring, or the like, description thereof is omitted.

  The seat receiver 3 has a shell shape that holds the seat 4, and a front end side of the seat receiver 3 is attached to the support base 2 so as to be movable back and forth, and a rear end side thereof is connected to a base end portion 51 b 4 of the back support 5. It is supported.

  The armrest 10 includes an elbow strut 101 attached to the seat support 3 and an elbow rest 102 provided on the upper end portion of the elbow strut 101. The left and right armrests 10 have a symmetrical shape.

  The back support 5 includes a back support rod 51 that is supported on the main shaft 22 of the support base 2 so as to be able to tilt backward, and an elastic horizontal flange 52 attached to the upper end portion of the back support rod 51. Become.

  The back support rod 51 is generally L-shaped in a side view, and includes a lower back frame 51b having a base end 51b4 attached to the main shaft 22 of the support base 2, and an upper portion coupled to the tip of the lower back frame 51b. And a back frame 51a. The lower back frame 51 b is made of metal, and the outside thereof is covered with a cover 53. The outer surface of the cover 53 extends forward from a position continuous with the outer surface of the upper back frame 51 a to the lower surface of the seat 4. In addition to the base end 51b4 attached to the support base 2, the lower back frame 51b includes a pair of vertical frame 51b1 that forms the outer shape of the lower back frame 51b and the vertical frame 51b1 that forms the pair. And a connecting plate portion 51b2 connected by welding. The coupling plate portion 51b2 is mainly composed of a coupling plate 51b21 that is a metal plate that is connected by welding while slightly bending the upper end front side of the vertical frame portion 51b1, and three nut portions are provided on the left and right sides of the coupling plate 51b21 in the vertical direction. Is forming. Of the nut portion, the upper four screw holes are used as frame fixing holes for coupling with the upper back frame 51a. Further, the lower two nut portions are used as the back fixing holes 51b22 to fix the lower end attaching portion 61b of the backrest 6. The upper back frame 51a is integrally formed of synthetic resin and extends substantially vertically when the backrest 6 is in a standing state. The upper end of the upper back frame 51a supports the upper portion of the back plate 61 via the elastic horizontal flange 52. The upper back frame 51a is bifurcated bifurcated at a base 51a1 provided so as to gradually change its direction vertically from a position continuous with the lower back frame 51b extending forward on the lower end side. It has a branch collar 51a2. The lower end attaching portion 61b is screwed at the lower portion of the base portion 51a1.

  The elastic recumbent 52 is a leaf spring having two intermediate portions supported by the upper end of the back support rod 51, and supports the backrest 6 at both ends thereof. The elastic horizontal bar 52 is a replaceable member independent of the back support bar 51. The elastic horizontal bar 52 is disposed at a pair of left and right arm portions 52a and the base end of the arm portion 52a, and is provided on the upper back frame 51a. The mounting part 52b attached to the branch collar part 51a2 and the connection part 52c which elastically connects between both the attachment parts 52b are comprised. Each part of the arm part 52a, the attaching part 52b, and the connecting part 52c is integrally formed of synthetic resin.

  The arm portion 52a is formed to be curved in an arcuate shape in plan view, and has a room to bend backward under the load of the seated person. As shown in FIG. 6, first and second convex portions T <b> 1 and T <b> 2 are formed on the extended end 52 a <b> 1 of the arm portion 52 a at positions separated vertically, and these first and second convex portions T <b> 1 and T <b> 1 are formed. A first recess H1 is formed during T2. The first and second convex portions T1 and T2 and the first concave portion H1 are the second and third concave portions H2 and H3 and the third convex portion formed in the side end attaching portion 61c of the back plate main body 61a. Engage with T3. Through holes K1, K2, and K3 penetrating in the vertical direction are formed in the substantially central portions of the first, second, and third convex portions T1, T2, and T3, and bearings (if necessary) around these holes. (Not shown) is attached. Then, the extended end 52a1 of the arm portion 52a and the back plate main body 61a are hinge-coupled using the axis B1. The attachment portions 52b are respectively formed at the base ends of the left and right arm portions 52a so as to be attached to the branch flange portions 51a2 that are spaced apart from each other in the upper back frame 51a of the back support rod 51. The connecting portion 52c elastically connects the two attachment portions 52b. The connecting portion 52c is formed in an arcuate shape in the rear of the plan view, and has a room for elastic deformation under the load of the seated person.

  The backrest 6 is mainly composed of a back plate 61. As shown in FIG. 3, the back plate 61 has a waist portion at the middle in the vertical direction of the back plate 61 that protrudes forward most and curves backward, and the lower end mounting portion 61 b that is fixed to the back support rod 51. More specifically, it is designed in consideration that an angle formed with a back support rod mounting portion 61b2 to be described later that is directly screwed is as close to a right angle as possible. As shown in FIGS. 4 and 5, the back plate main body 61a, the side end mounting portions 61c provided on the left and right sides of the back plate main body 61a, and the lower end provided on the lower end of the back plate main body 61a. The side end mounting portion 61c is connected to both end portions of the elastic horizontal bar 52, and the lower end mounting portion 61b is mounted to the lower back frame 51b of the back support rod 51. ing.

  The back plate body 61a is integrally formed of a synthetic resin and includes a peripheral frame portion 61a1 that does not have a hole 61d and an intermediate surface portion 61a2 surrounded by the peripheral frame portion 61a1.

  The peripheral frame portion 61a1 is formed along the upper side, the left and right side sides, and the lower side of the back plate main body 61a, and has an annular shape when viewed from the front. The lower end attaching portion 61b and the side end attaching portion 61c are integrally provided on the peripheral frame portion 61a1. That is, the lower end attaching portion 61b and the side end attaching portion 61c are also integrally formed with synthetic resin together with the back plate main body 61a.

  The intermediate surface portion 61a2 is a substantially oblong rectangle in front view surrounded by the peripheral frame portion 61a1 in the vertical and horizontal directions, and the left and right sides are parallel. Moreover, the resin mesh area | region M which provided the some hole 61d, and the resin shell area | region S which does not have the hole 61d are provided. The resin mesh regions M and the resin shell regions S are alternately arranged.

  The resin shell region S of the intermediate surface portion 61a2 has a horizontal belt shape and is arranged so as to connect the opposed portions of the peripheral frame portion 61a1. The resin shell regions S having a belt shape are arranged in parallel with a plurality of intervals in the vertical direction, and among these, between the two resin shell regions S and between the resin shell region S and the peripheral frame portion 61a1. The resin mesh regions M are formed between them.

  The resin mesh region M is formed thinner than the resin shell region S, and is provided with a plurality of circular holes 61d. Further, a plurality of circular recessed portions 61e corresponding to the shape of the holes 61d of the resin mesh region M are formed on the front surface of the resin shell region S. The plurality of holes 61d provided in the resin mesh region M and the plurality of recesses 61e provided in the resin shell region S are arranged with a certain regularity.

  The front surface of the resin shell region S and the front surface of the resin mesh region M are formed flush with each other. On the other hand, the back surface of the resin mesh region M is provided to be recessed from the back surface of the resin shell region S.

  A step portion 61a3 is formed at the boundary between the front surface of the peripheral frame portion 61a1 and the intermediate surface portion 61a2. In other words, the intermediate surface portion 61a2 protrudes forward from the peripheral frame portion 61a1 with the step portion 61a3 as a boundary.

  The side end attaching portion 61c is made integrally with the peripheral frame portion 61a1 of the back plate 61 by a synthetic resin. The lower end attachment portion 61b is provided to project rearward from the peripheral frame portion 61a1 and symmetrically slightly above the central portion of the left and right side ends of the peripheral frame portion 61a1. A rear end portion of the lower end attaching portion 61b has a concave portion and a convex portion for attaching the elastic reed 52. Specifically, the first and second convex portions T1 and T2 and the first concave portion H1 provided at the extension end 52a1 of the arm portion 52a of the elastic recumbent pad 52 are connected to corresponding portions so as to engage with each other. Second and third concave portions H2 and H3 and a third convex portion T3 are provided, and an extended end 52a1 of the arm portion 52a and the side end attaching portion 61c are provided at a substantially central portion of the third convex portion T3. A through hole K2 is formed for vertically penetrating the axis B1 for hinge connection.

  The lower end attachment portion 61b is made integrally with the peripheral frame portion 61a1 of the back plate 61 by a synthetic resin. The lower end attachment portion 61b has a width dimension substantially equal to the width dimension of the lower back frame 51b, and protrudes in a direction intersecting the peripheral frame portion 61a1 from the lower end central portion of the peripheral frame portion 61a1. The main body 61b1 and the back support rod mounting portions 61b2 provided on both side edges of the lower end mounting portion main body 61b1 are provided. The lower end attachment portion main body 61b1 has a tapered shape that becomes thinner as it goes downward, and its upper portion protrudes rearward from the lower end of the peripheral frame portion 61a1, while its lower portion is the lower end of the peripheral frame portion 61a1. Projecting forward. The back support rod attaching portion 61b2 is provided in parallel along the lower part of the lower end attaching portion main body 61b1, specifically, along both side edges of the front portion from the peripheral frame portion 61a1. In addition, screw holes 61b3 for fixing with screws B2 are provided in portions corresponding to the back fixing holes 51b22 of the lower back frame 51b in the vicinity of the respective centers of the left and right back support rod mounting portions 61b2.

  In the present embodiment, the back plate 61 is attached to the back support rod 51 by screwing the lower end attaching portion 61b of the back plate 61 with screws B2. Specifically, as shown in FIGS. 7 and 8, a lower end mounting portion 61b of the back plate 61 is provided on the coupling plate portion 51b2 of the back support rod 51, and the back support rod is attached to the lower end mounting portion 61b. It passes through the screw hole 61b3 and the back fixing hole 51b22 provided in the part 61b2, and is fixed with a screw B2 arranged orthogonal to the protruding direction of the lower end mounting part 61b. Accordingly, the upper portion of the lower end attachment portion main body 61b1 is attached and fixed to the upper back frame 51a, and the lower portion of the lower end attachment portion main body 61b2 is attached and fixed to the lower back frame 51b.

  In addition, since the chair 100 in the present embodiment has the above-described structure, it is assumed that a loop structure R that can be elastically deformed is formed by the elastic reed 52 and the back plate 61.

  The loop structure R refers to a structure that continuously surrounds a certain region. Specifically, the loop structure R has an annular shape in plan view formed continuously by the elastic reed 52 and the back plate 61. is there. For example, as the loop structure R shown in FIG. 9, a structure having an approximately three-month shape in plan view is shown by the elastic reed 52 and the back plate 61. The elastically deformable loop structure R has a relationship in which the elastic reed 52 and the back plate 61 cooperate. For this reason, even if a specific portion of the back plate 61 is elastically deformed rearward under the load of the seated person, other portions forming the loop structure R are necessarily elastically deformed in conjunction with each other. Become.

  The characteristics of the loop structure R will be described as follows using a more specific example. When the body is twisted toward the left rear side while the seated person is seated, the shoulder circumference of the seated person presses the left side of the back board body 61a backward, and as shown in FIG. 10, the back board body 61a The left side portion of the elastic elastic band 52 is elastically deformed rearward, and the elastic horizontal surface 52 is bent so that the left side arm portion 52a of the elastic horizontal surface 52 constituting the loop structure R rotates in conjunction with this. At the same time, the right side portion of the back plate main body 61a is displaced relatively forward with the branch collar portion 51a2 of the back support rod 51 as the central axis, so that the connecting portion 52c of the elastic lateral rib 52 and the right arm portion 52a are In conjunction with the displacement of the right side portion of the back plate body 61a, the right side portion of the back plate body 61a is elastically deformed so as to push it forward. Thus, the loop structure R inevitably undergoes elastic deformation over the entire members constituting the loop structure R even when a large load is applied to either the left or right side of the back plate body 61a. A good sitting comfort can be provided as if it is supported so as to be wrapped. Since such a loop structure R is formed, the right side portion of the back plate main body 61a is the branched arm of the back support rod 51 when the body is twisted toward the left rear while the seated person is seated. The upper end side of the back plate 61 is displaced to the left with respect to the lower end side at the same time as the portion 51a2 is displaced relatively to the center axis, that is, the upper portion of the back plate 61 is attached to the back support rod 51 below the upper portion. It is displaced so that it slides slightly to the left of the part.

  In addition, as shown in FIG. 11, when a backward load is applied to the center of the back plate 61 in accordance with the backward tilting operation of the backrest 6, the back plate 61 moves and curves backward, and the elastic sideways Both arm portions 52a of the collar 52 are rotated rearward so that the loop structure R has a flat shape in plan view.

  By setting it as the above structures, the chair 100 which concerns on a present Example is directly or indirectly in the aspect which an upper end side can be displaced to right and left with respect to the lower end side by the back support rod 51 and this back support rod 51. A back plate 61 supported by the back plate 61, wherein the back plate 61 is indirectly supported by the tip of the back support rod 51, and the back plate main body. A lower end mounting portion 61b provided at the lower end portion of 61a and fastened to the base end side of the back support rod 51 using a screw B2, and the lower end mounting portion 61b of the back plate main body 61a. Since the lower end attaching portion 61b is attached to the back support rod 51 by means of the screw B2 that is arranged orthogonal to the protruding direction of the lower end attaching portion 61b, the axial direction of the screw B2 is It is not perpendicular to the back plate 61. Therefore, even when the back plate 61 is displaced in the left-right direction, a force in the direction in which the screw B2 is loosened is not applied to the head of the screw B2, and the attachment portion of the back plate 61 to the back support rod 51 is not applied. It is possible to take measures to prevent loosening.

  Further, the back plate 61 is provided with side end mounting portions 61c that are paired with the left and right side portions of the back plate main body 61a, and the side end mounting portions 61c are connected to the back support rod 51 via elastic horizontal ribs 52. Therefore, the upper end side of the back plate 61 is supported by the back support rod 51 in such a manner that the upper end side of the back plate 61 can be displaced left and right with respect to the lower end side. That is, since the back plate 61 is fixed by the lower end mounting portion 61b and the two left and right side end mounting portions 61c, the left and right independent deformations of the back plate 61 are transmitted to the other side to some extent and linked to a good condition. , It can be deformed to tilt left and right.

  Further, an elastic recumbent 52 is formed by supporting two intermediate portions on the back support rod 51 and extending the arm portions 52a to the left and right, and extending ends 52a1 of the arm portions 52a on the back plate 61. Since they are respectively attached to the side end attaching portions 61c, the back plate 61 is supported in such a manner that it can be displaced left and right. That is, the loop structure R made from the back plate 61 and the elastic reed 52 is increased, and the elastically deformable region can be increased.

  Further, the back support rod 51 has branch flange portions 51a2 which are separated from each other in the left and right directions, and attachment portions 52b provided at two intermediate portions of the elastic horizontal rod 52 are respectively attached to both the branch flange portions 51a2. Therefore, the movement of the back support rod 51 and the elastic recumbent paddle 52 can be interlocked. Further, the elastic recumbent paddle 52 is provided with attachment portions 52b at the base ends of the left and right arm portions 52a, Since both the attachment parts 52b are elastically connected by the connecting part 52c, the movements of the back plate 61, the back support bar 51, and the elastic horizontal bar 52 can be interlocked.

  Further, since the elastic reed 52 is formed by integrally forming the arm portion 52a, the mounting portion 52b, and the connecting portion 52c with a synthetic resin, the number of parts and the number of processing steps can be reduced, and the elastic horizontal reed 52 can be reduced. The characteristics can be designed such that the width, thickness, and planar shape of the flange 52 are partially different.

  The present invention is not limited to the embodiment described above, and various modifications can be made.

  In the present embodiment, the back plate is provided with a side end mounting portion, and the side end mounting portion is indirectly supported by the back support rod through an elastic ledge. Not limited to this, the back plate may be directly supported by the back support rod. Even in such a case, the back support rod 51 and the back plate 61 have a cooperative relationship. For example, when the body is twisted toward the right rear in a state where the seated person is seated, The left side portion of the back plate body 61a is displaced relatively forward with the back support rod 51 as the central axis, and at the same time, the upper end side of the back plate 61 is slightly displaced to the right with respect to the lower end side. This is because the same effect as that of the present embodiment can be obtained as long as it is displaced so as to slide slightly to the right from the portion attached to the back support rod 51 below.

  Moreover, in this embodiment, although the aspect which had the branch collar part in the upper back frame was shown as a back support collar which has the branch collar part spaced apart on either side, it is not restricted to this. Further, the place where the elastic recumbent is arranged is not limited to that shown in the present embodiment, and various modifications can be made without departing from the spirit of the present invention.

  Although the present embodiment has been described in detail above, the present invention is not limited to the above-described embodiment, and the specific configurations of other parts can be variously modified without departing from the spirit of the present invention.

The rear perspective view showing the chair concerning the embodiment of the present invention. The front perspective view of the embodiment. The side view of the embodiment. The front view which shows the backboard for chairs concerning the embodiment. The rear view. The schematic perspective view which expands and shows the connection aspect of the side end attaching part of the chair backplate which concerns on the same embodiment, and an elastic recumbent. The side view showing the back board for chairs concerning the embodiment. The perspective view which shows the attachment method of the lower end attachment part of the backplate for chairs concerning the embodiment. Schematic which shows the loop structure formed with the elastic recumbent and back plate which concern on the embodiment. Schematic which shows the aspect in which the loop structure formed with the elastic recumbent and back plate which concerns on the same embodiment receives a load, and deform | transforms. Schematic which shows the aspect in which the loop structure formed with the elastic recumbent and back plate which concerns on the same embodiment receives a load, and deform | transforms.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Chair 51 ... Back support rod 51a2 ... Branch collar part 52 ... Elastic reed 52a ... Arm part 52a1 ... Extension end 52b ... Attachment part 52c ... Connection part 61 ... Back board 61a ... Back board body 61b ... Lower end attachment part 61c ... Side end mounting part B2 ...

Claims (6)

A back support rod and a back plate that is supported directly or indirectly by the back support rod in a mode in which the upper end side can be displaced left and right with respect to the lower end side, the back plate, A back plate main body supported directly or indirectly on the distal end portion of the back support rod, and provided at a lower end portion of the back plate main body, and fastened to the base end side of the back support rod using a fastener. A lower end mounting portion, and the lower end mounting portion protrudes in a direction intersecting with the lower end portion of the back plate main body, and the lower end mounting portion is arranged orthogonal to the protruding direction of the lower end mounting portion. A chair characterized by being attached to the back support rod by means of a dressing device.   The back plate is provided with a pair of side end mounting portions on the left and right side portions of the back plate body, and the side end mounting portions are indirectly supported by the back support rod through an elastic reed. The chair according to claim 1.   The elastic reed has two intermediate portions supported by the back support rod and the arm portions are extended left and right, and the extended ends of the arm portions are respectively attached to the side end attaching portions of the back plate. The chair according to claim 2.   The said back support rod has the branch collar part spaced apart to right and left, The attachment part provided in two intermediate parts of the said elastic recumbent part is attached to these both branch collar parts, respectively. Chair.   The chair according to claim 4, wherein the elastic reed is provided with attachment portions at the base ends of the left and right arm portions, and the attachment portions are elastically connected between the attachment portions.   The chair according to claim 5, wherein the elastic reed is formed by integrally forming the arm portion, the attachment portion, and the connecting portion with a synthetic resin.

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