JP2014079492A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to firmly and easily attach optional members such as a hanger and a headrest to the backrest of a chair by increasing the area of a mounted surface of the backrest side.SOLUTION: A chair is equipped with a main body support member 54 that is provided on a backrest 50 on which an optional member 60 is to be mounted, extends in a width direction X of the chair, and has a mounted surface 54g convex downward. The optional member 60 has backrest mounting parts 63 and 65 having mounting surfaces 63a and 65a to be engaged with the convex portion of the mounted surface 54g.

Description

  The present invention relates to a chair to which an optional member such as a hanger or a headrest can be attached to the backrest.

  Conventionally, as a chair, it has a leg, a seat provided on the upper part of the leg, and a back part that supports a seated person sitting on the seat, and is rearward and upward from the leg. A back frame that is supported by a back support rod that extends toward the back and has an upper frame and a lower frame and is formed in a substantially pentagonal shape when viewed from the front; and a net member that is disposed in the back frame and is elastically deformable The thing of the structure provided with these is known.

  In such a chair, there is a chair to which an optional member such as a hanger or a headrest can be attached to the backrest, and the optional member has an attachment surface continuous in the width direction of the chair on the back side of the backrest. It is attached to the site | part (frame of the width direction) (for example, refer patent document 1, 2).

In Patent Document 1, among the frame members constituting the backrest, the upper frame is composed of a front frame and a rear frame, and the rear frame located on the rear side includes a hanger as an optional member, and a member having a female screw portion. Is described about the structure clamped from both front and rear.
In Patent Document 2, a hanger as an optional member is fitted to a front member fitted from the front to a frame facing in the width direction so as not to fall off, and a rear member fitted from the rear to the frame is vertically fitted. A configuration provided with the position adjusting means is disclosed.

Japanese Patent No. 4740626 JP 2011-136024 A

However, the attachment of the optional member in the conventional chair has the following problems.
That is, in the above-mentioned Patent Document 1, since the rear frame is a member separated rearward from the seating surface of the backrest and the option member is configured to project rearward, there is a problem in design. When this structure is applied to the front frame, a member having a female screw portion is provided on the seating surface, and there is a possibility of giving a foreign object feeling to the seated person's back, so there is room for improvement in that respect.

  Further, in Patent Document 2, the fitting of the front member and the hanger is a dovetail continuous in the vertical direction, and the hanger is made of rubber arranged to give a feeling of moderation to the vertical position adjustment of the hanger. While it is possible to prevent backlash, there is a problem with the mounting strength because the hanger is not directly connected to the frame. Furthermore, there is a problem that it takes time and labor to arrange the rubber behind the rear member.

  The present invention has been made in view of the above-described problems. By increasing the area of the surface to be attached on the backrest side, optional members such as hangers and headrests can be firmly and easily attached to the backrest. The purpose is to provide a chair that can be used.

  In order to achieve the above object, the chair according to the present invention is a chair in which an optional member is attached to the backrest, and the backrest extends along the width direction of the chair, and extends upward and downward. An option mounting portion having a mounted surface that is convex toward at least one of the options is provided, and the optional member includes a backrest mounting portion having a mounting surface that engages with the mounted surface.

In the present invention, the mounting surface of the option member has a concave shape that matches the convex portion of the mounted surface in the optional mounting portion of the backrest. The optional members can be easily aligned in the width direction, and the optional members can be efficiently attached to the backrest.
In addition, the mounting portion between the mounting surface and the mounted surface is in surface contact, and the mounting surface can be made convex so that the mounting area can be increased compared to a flat surface. The mounting state of the optional member can be stabilized. In particular, by providing the back mounted surface over the entire width direction, the width of the mounted surface can be made longer than the mounting surface of the optional member. It is possible to stabilize the attachment state as compared with the case where is shorter than the attachment surface. Moreover, in the present invention, since the attached surface is convex toward at least one of the upper side and the lower side, the so-called truss effect can be provided, and the strength of the attached surface is increased.

  Further, the mounted surface and the mounting surface are surfaces facing each other in the vertical direction, and the mounting surface of the option member can be mounted in the vertical direction with respect to the optional mounting portion, and the mounting portion is directed toward the front side of the backrest. Therefore, there is an advantage that the attachment portion does not hit the back of the person sitting on the chair.

  Moreover, in the chair which concerns on this invention, the said backrest attachment part is extended from the rear end of the front-back direction in the front-back direction in the 1st attachment plate which extends along the said width direction and has the said attachment surface. And a second attachment plate that abuts against the rear side surface of the option attachment portion.

  According to the chair of the present invention, the backrest mounting portion of the optional member is formed in an L shape in a sectional view by the first mounting plate and the second mounting plate. The optional member can be easily attached simply by applying to the rear. At this time, since the second mounting plate contacts the rear side surface of the option mounting portion, the backrest mounting portion of the option member can be positioned in the front-rear direction with respect to the option mounting portion of the backrest.

 Moreover, in the chair which concerns on this invention, it is preferable that the positioning convex part is formed in any one of the said to-be-attached surface and the said mounting surface, and the positioning recessed part fitted to this positioning convex part is formed in the other.

  In the chair configured as described above, since the positioning convex portion and the positioning concave portion that are fitted to each other are formed on the mounting surface of the option member and the mounting surface of the backrest, the mounting surface and the mounting surface Can be more easily fitted.

 In the chair according to the present invention, the backrest is configured by stretching a tension member on a frame member including an upper frame portion extending in the width direction at least upward, and the upper frame portion is configured as the option. An attachment part may be sufficient.

  In this case, the backrest has a configuration in which a tension member is stretched on the front side of the frame member having the upper frame portion, and the upper frame portion as the option mounting portion is exposed on the rear side, so that it is easy to visually recognize the optional member. Can be attached easily by accessing the option mounting portion from the rear.

  Moreover, in the chair which concerns on this invention, it is preferable that several option members are attached to the said option attachment part by overlapping the attachment surfaces of each backrest attachment part in the up-down direction.

  In the present invention, the attachment surfaces of the backrest attachment portions of the plurality of option members can be attached to the attachment surface of the option attachment portion so as to overlap each other.

  Moreover, in the chair which concerns on this invention, it is preferable that the said to-be-attached surface and the said attachment surface are curving along the said width direction.

  In the chair configured in this way, the mounted surface on the backrest side forms a curved surface, so that the mounting surface of the option member can be moved in the width direction along the mounted surface, and at the time of positioning There is an advantage that fine adjustment is possible.

  According to the chair of the present invention, an optional member such as a hanger or a headrest can be firmly and easily attached to the backrest by increasing the area of the attachment surface on the backrest side.

It is the front view which looked at the chair by embodiment of this invention from the front. It is the front view which looked at the backrest and optional member of the chair shown in FIG. 1 from the front, Comprising: It is the figure which abbreviate | omitted the upholstery material. It is the AA arrow directional view shown in FIG. 2, Comprising: It is the side view which abbreviate | omitted the backrest and the optional member. It is the perspective view which looked at the state which removed the auxiliary support member of the upper frame part from diagonally forward. (A) is the perspective view which looked at the normal time of the chair from the upper part, (b) is the perspective view which looked at the case where it took the attitude | position which turned around from the width direction one side from the upper part. FIG. 2 is a cross-sectional view taken along the line P-P shown in FIG. 1, in which (a) is a normal view of the chair, and (b) is a view of a seated person leaning on his back. It is a side view for demonstrating the effect | action of the chair by a modification. It is the perspective view which looked at the state which decomposed | disassembled the backrest and optional member shown in FIG. 2 from diagonally forward. It is the perspective view which looked at the state which decomposed | disassembled the backrest and optional member shown in FIG. 2 from diagonally back. It is sectional drawing which shows the attachment structure of an option member, Comprising: It is the BB sectional drawing shown in FIG. It is the front view which looked at the headrest from the front. It is the front view which looked at the hanger from the front.

  Hereinafter, a chair according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the chair 1 according to the present embodiment includes a leg body 10 provided on a floor surface F, a backrest support body 20 supported by the leg body 10, and the backrest support body 20. And a backrest support member 40 supported by the backrest support 20, and a backrest supported by the backrest support member 40 and supporting the back of the seated person. 50 and an optional member 60 attached to the backrest 50.

  In the following description, in the chair 1, the direction in which the seated person sits and leaves is the front-rear direction Y (see FIGS. 3 and 4), the side on which the seated person sits is the front, the opposite side is the back, A direction in a horizontal plane perpendicular to the front-rear direction Y is defined as a width direction X, and a side away from the chair 1 in the width direction X is defined as a side.

(Leg)
The leg body 10 includes a plurality of leg rods 12 provided with casters 11 capable of turning on the floor surface F, and leg columns 13 supported by the plurality of leg rods 12. The plurality of leg rods 12 are radially arranged and connected to each other at the base ends, and casters 11 are attached to the respective tips. The lower part of the pedestal 13 is connected to the base ends of the plurality of leg rods 12 and is erected upward. Further, a support base 14 having a built-in reclining mechanism (not shown) that allows the backrest support 20 to be tilted backward is attached to the upper portion of the pedestal 13.

(Backrest support)
The backrest support 20 is provided with arm portions 21 that are pivotally attached to both sides of the support base 14 in the width direction and extend in the front-rear direction. The arm portions 21 are directed upward from the intermediate portions of the arm portions 21 in the extending direction. 22 extends upward and supports the seat 30.
The rear ends of the pair of arm portions 21 are connected to each other, and the connecting portion is fixed to a lower portion of a backrest supporting member 40 described later.
Further, as shown in FIG. 1, the backrest support 20 is provided with an armrest 23 that extends upward from the side.

(Seat)
The seat portion 30 is supported at the front portion so as to be slidable in the front-rear direction with respect to the support base 14, and is pivotally attached to the upward arm portion 22 of the backrest support body 20. As the backrest support 20 is tilted backward by the reclining mechanism of the support base 14, the seat portion 30 moves rearward relative to the support base 14 and tilts the rear side downward. It is configured.

(Back support member)
As shown in FIGS. 2 and 3, the backrest rear support member 40 includes a lower connection portion 41 connected to the backrest support 20 (see FIG. 1), and an intermediate portion extending upward from the lower connection portion 41. It has the connection part 42 and the upper connection part 43 distribute | arranged so that it may spread gradually outside the width direction X as it goes upwards from the upper end of this intermediate | middle connection part 42. As shown in FIG.

  As shown in FIG. 1, the lower connecting portion 41 has positioning recesses (not shown) in which the rear ends of the pair of arm portions 21 of the backrest support 20 are fitted on the lower rear surface, and the pair of arm portions. 21 is fitted in the positioning recess. And the lower connection part 41 is fixed to the upper part of the backrest support body 20 by this positioning recessed part, for example by screwing by a volt | bolt nut (not shown). Further, the lower connecting portion 41 is connected to the backrest 50 at the lower end.

  As shown in FIGS. 2 and 4, the intermediate connecting portion 42 has a lower end connected to the lower connecting portion 41 and is arranged upward. Further, the intermediate connecting portion 42 is formed such that the length dimension in the width direction X gradually decreases as it goes upward, and the length dimension in the width direction X increases again as it goes upward from the middle.

  The intermediate connecting portion 42 is formed with a horizontal U-shaped horizontal section such that the front surface is concave and the rear surface is convex. The intermediate connecting portion 42 is formed with a plurality of lateral ribs 42A projecting forward and extending in a substantially horizontal direction on the front surface formed in a concave shape, and spaced apart in the vertical direction. A plurality of vertical ribs 42 </ b> B extending in the vertical direction are separated from each other in the width direction of the chair 1. In the present embodiment, four horizontal ribs 42A are formed, and two vertical ribs 42B are formed so as to intersect these horizontal ribs 42A. In the intermediate connecting portion 42, in addition to the horizontal cross section being formed in a horizontal U shape, the rigidity is enhanced by the horizontal rib 42A and the vertical rib 42B.

  The upper connecting part 43 is arranged so that the lower end is connected to the intermediate connecting part 42 and gradually spreads outward in the width direction as it goes upward. That is, the upper connecting portion 43 has a pair of connecting pieces 43A and 43B arranged so as to be gradually separated from each other in the width direction X toward the upper side. It is formed in a letter shape.

  The pair of connecting pieces 43A and 43B constituting the lower connecting portion 41, the intermediate connecting portion 42, and the upper connecting portion 43 are integrally formed, and the backrest support member 40 protrudes backward as viewed from the side as a whole. It is formed so as to be curved.

  That is, the lower connecting portion 41 is curved so as to go backward as it goes upward as a whole. In addition, the pair of connecting pieces 43A and 43B constituting the upper connecting portion 43 is inclined so as to go forward as it goes upward while being curved. And the intermediate connection part 42 has connected the upper connection part 43 and the lower connection part 41, curving.

(Backrest)
As shown in FIG. 2, the backrest 50 includes a tension member 51 that receives the back of the seated person, and an upper frame portion 52 to which the tension member 51 is attached and connected to the upper connection portion 43 in the backrest support member 40. And a pair of vertical frame portions 53A and 53B (53) which are connected to the upper frame portion 52 and to which the upholstery material 51 is attached.

The upholstery material 51 is composed of a flexible member that receives the back of the seated person and can be deformed according to the posture of the back. Specifically, in this embodiment, it is formed of a mesh-like member, and is elastically flexible and deformable as a whole by elastically expanding and contracting the thread material constituting the mesh. The upholstery material 51 is provided in a portion surrounded by the upper frame portion 52 and the pair of vertical frame portions 53, and ends thereof are fixed to the upper frame portion 52 and the pair of vertical frame portions 53.
The upholstery material 51 is stretched on the front surface of the backrest 50 by supporting the end portion 51 a (see FIG. 10) on the edge of the upper frame portion 52.

  As shown in FIGS. 2, 4, and 5 (a) and 5 (b), the upper frame portion 52 extends along the width direction X, and both ends thereof are a pair of connecting pieces in the upper connecting portion 43. It is connected to the upper ends of 43A and 43B, and is connected to the upper ends of the pair of vertical frame portions 53A and 53B.

  Both the vertical frame portions 53 </ b> A and 53 </ b> B are configured to be torsionally deformable in accordance with the force acting from the upholstery material 51. The one vertical frame portion 53A includes a lower material 57A and an upper material 56A connected to the upper end of the lower material 57A. Similarly, the other vertical frame portion 53B includes the lower material 57B and the lower material 57B. An upper member 56B connected to the upper end of the member 57B.

  The lower members 57A and 57B are formed such that their lower ends are connected to the lower end of the backrest rear support member 40 and gradually move forward and expand in the width direction X as they go upward. Each of the lower members 57A and 57B is formed so that the cross-sectional dimension decreases as it goes upward.

  The upper members 56A and 56B are configured to be torsionally deformable according to the force acting from the back of the seated person and to be elastically deformable by the force acting from the back of the seated person.

  The upper members 56A and 56B have lower ends connected to the corresponding lower members 57A and 57B, and upper ends connected to the pair of connecting pieces 43A and 43B of the upper frame portion 52 and the backrest support member 40, and head upward. Accordingly, the lower members 57A and 57B are formed so as to be inclined relatively rearward.

  In the present embodiment, the upper members 56A and 56B are formed so as to be gradually inclined rearward from the upper ends of the lower members 57A and 57B upward.

  As described above, the vertical frame portions 53A and 53B are formed so as to gradually move forward from the lower portion 57A and 57B toward the upper side, and the lower members 57A and 57B are connected to the upper members 56A and 56B. The upper members 56A and 56B are formed so as to gradually move forward from the portion toward the upper side, and the vertical frame portions 53A and 53B are curved so as to be convex toward the front as a whole.

The backrest rear support member 40 and the vertical frame portion 53 are integrally formed in an annular shape as viewed from the side shown in FIG. In the present embodiment, the lower back connection part 41, the intermediate connection part 42, the one connection piece 43A, and the one vertical frame part 53A of the backrest support member 40 are formed in an annular shape when viewed from the side. Moreover, it is formed in an annular shape as viewed from the side by the lower connecting portion 41, the intermediate connecting portion 42, the other connecting piece 43B, and the other vertical frame portion 53B of the back support member 40.
That is, in the present embodiment, each part of the backrest supporting member 40, the upper frame part 52 of the backrest 50, and the pair of vertical frame parts 53A and 53B are integrally formed.

  Here, operations of the backrest rear support member 40 and the backrest 50 of the chair 1 when a seated person sits on the seat 30 of the chair 1 configured as described above will be described.

  The solid line in FIG. 1 and FIG. 6A show the chair 1 in a state where the seated person sits on the seat 30 and does not lean on the backrest 50, and the two-dot chain line in FIG. 1 and FIG. The chair 1 in a state where the person leans on the backrest 50 is shown.

  When the seated person leans on the backrest 50, a force from the seated person acts on the tension material 51 of the backrest 50, and the thread material constituting the mesh of the tension material 51 elastically expands and contracts by this force. As a whole, along the back of the seated person, it is elastically deformed into an arc shape so that the substantially central portion in the width direction protrudes rearward.

  Further, the vertical frame portions 53A and 53B to which the upholstery material 51 is fixed are elastically deformed so that the inner side of the width direction X is directed rearward by the force acting on the upholstery material 51 and at the same time in the width direction so as to be close to each other. Move inside X.

  As the vertical frame portions 53A and 53B are elastically deformed, the upholstery material 51 can be further deformed into an arc shape in which a substantially central portion in the width direction X projects rearward, and the backrest 50 is It is supported by the drooping rear support member 40.

  Furthermore, when the seated person takes a posture of turning back from one side in the width direction X of the backrest 50, as shown in FIG. 50 acts in a biased manner on one side in the width direction, and a load that twists and deforms the vertical frame portion 53B acts on the vertical frame portion 53B on the biased side.

  Here, the upper member 56B in the vertical frame portion 53B is configured to be torsionally deformable by a force acting from the back of the seated person. In addition, since the connecting pieces 43A and 43B are formed so as to be narrowed away from each other and are joined to each other and connected to the intermediate connecting portion 42, the intermediate connecting portion 42 is configured to promote torsional deformation of the upper member 56B. It is said that. Therefore, the upper material 56B is twisted and deformed toward the rear side so as to follow the back of the seated person according to the load of the seated person.

Further, since the connecting piece 43B connected to the upper member 56B is configured to be displaceable with the twist of the upper member 56B, the connecting piece 43B is moved to the rear side with the twist toward the rear side of the vertical frame portion 53B. Displace.
The upholstery material 51 in the backrest 50 is elastically deformed so as to wrap around the back of the seated person by elastically expanding and contracting the thread material constituting the mesh of the upholstered material 51 by a load from the seated person.

Thus, the upper material 56B, the connecting piece 43B, and the upholstery material 51 are deformed so as to wrap around the back and shoulders following the deformation of the back and shoulders of the seated person.
The same operation is performed when the seated person takes a posture of turning back from the other side in the width direction of the backrest 50.

  In the chair 1 configured as described above, when a seated person sits on the seat portion 30 and the seated person's back is received by the upholstery material 51 of the backrest 50, the load of the seated person is transferred from the upholstery material 51 to a pair of vertical frames. It is transmitted to the parts 53A and 53B. The upper members 56A and 56B of the vertical frame portions 53A and 53B are connected and supported by the upper connecting portion 43 of the backrest supporting member 40 supported by the backrest support 20, and the lower members 57A and 57B are supported by the backrest supporting members. 40, the load from the seated person can be reliably supported by the vertical frame portions 53A, 53B, the backrest support member 40, and the backrest support body 20.

  In addition, when the posture is such that it turns backward from one side in the width direction X, the load from the seated person acts on one side in the width direction X of the backrest 50, and the biased side A load that twists and deforms the vertical frame portions 53A and 53B acts on the vertical frame portions 53A and 53B. Since the upper members 56A and 56B of the vertical frame portions 53A and 53B are torsionally deformed by the force applied from the tension member 51, the upper members 56A and 56B are deformed to follow the deformation of the seated person's back and shoulders according to the load of the seated person. Can be received together with the upholstery, and the backrest 50 can be inclined backward.

  Further, when the load from the seated person is transmitted from the tension member 51 of the backrest 50 to the pair of vertical frame portions 53A and 53B, the upper members 56A and 56B of the vertical frame portions 53A and 53B are twisted and deformed. The pair of connecting pieces 43A and 43B connected to the upper members 56A and 56B are displaced with the torsional deformation of the upper members 56A and 56B. Therefore, when the posture is such that it turns backward from one side in the width direction, the upper members 56A and 56B on one side are torsionally deformed and the connecting pieces 43A and 43B on one side are displaced to stretch the back. Since it can be received so as to be wrapped with the material, it can be stably supported in a state following the deformation of the back and shoulders of the seated person.

  As described above, the upper members 56A and 56B, the upholstery material 51, and the connecting pieces 43A and 43B of the vertical frame portions 53A and 53B follow the deformation of the seated person's back and shoulders, and incline backward while tilting backward. The shoulder can be stably supported.

  On the other hand, the lower members 57A and 57B of the vertical frame portions 53A and 53B together with the upholstery material 51 reliably support the waist around the seated person's back. Therefore, when it takes the attitude | position which turns around from the width direction one side, lower material 57A, 57B can support a seated person's waist circumference with the tension material 51. FIG.

  Further, with respect to the force acting backward from the seated person, when the seated person's back is received by the upholstery material 51 of the backrest 50, the load of the seated person is transferred from the upholstery material 51 to the upper frame portion 52 and a pair of This is transmitted to the vertical frame portions 53A and 53B. The upper frame portion 52 is connected and supported by a pair of connecting pieces 43 </ b> A and 43 </ b> B of the backrest rear support member 40, and the backrest rear support member 40 is supported by the backrest support 20. Therefore, the load from the seated person can be reliably supported by the upper frame portion 52, the backrest support member 40, and the backrest support body 20.

  On the other hand, the pair of vertical frame portions 53A and 53B connected to both ends of the upper frame portion 52 in the width direction X are elastically deformed by the force applied from the upholstery material 51. It can be received so that it can be deformed to follow and the back is wrapped with the upholstery material 51. For this reason, the seated person can be seated in a stable state.

  Further, since the upper members 56A and 56B constituting the vertical frame portions 53A and 53B are elastically deformed by the force applied from the upholstery material 51, the upper members 56A and 56B are deformed so as to follow the back of the seated person according to the load of the seated person. Can be received together with the upholstery material 51.

  On the other hand, since the lower members 57A and 57B constituting the vertical frame portions 53A and 53B are formed so as to be gradually inclined forward as they go upward, the load acting on the rear from the seated person is reduced. , 57B and can be reliably supported by the axial force of the lower members 57A, 57B themselves.

  As described above, the vertical frame portions 53A and 53B are formed so as to gradually move forward by the lower members 57A and 57B from the lower portion to the upper portion, and the connecting portions between the lower members 57A and 57B and the upper members 56A and 56B. The upper members 56A and 56B are formed so as to gradually go forward as they go upward, and are curved so as to be convex toward the front as a whole. Therefore, in the front-rear direction, the deformation of the vertical frame portions 53A and 53B itself can be suppressed and the seated person's load can be reliably received, and in the width direction, the vertical frame portions 53A and 53B themselves face the inside of the seated person. It can be received so as to bend and deform so as to follow the back and wrap the back.

Moreover, in the chair 1 in this Embodiment, the intermediate connection part 42 distribute | arranged between the lower connection part 41 and the upper connection part 43 of the backrest rear part supporting member 40 acts on the backrest 50 from a seated person's back. Although it is configured to support the load, as shown in FIG. 7, a member disposed between the lower connecting portion 41 and the upper connecting portion 43 of the backrest support member 240 is configured as a deformation allowing portion 242. It is also possible to employ a chair 201 according to a modification.
In this case, the deformation allowing portion 242 has a lower end connected to the lower connecting portion 41 and an upper end connected to the upper connecting portion 43, and no ribs are formed on the front surface of the deformation allowing portion 242. Moreover, the deformation | transformation permission part 242 can be elastically deformed according to the load which acts on the backrest 50 from a seated person's back.

  7 indicates the chair 201 in a state where the seated person is seated on the seat portion 30 and is not leaning on the backrest 50, and the two-dot chain line in FIG. 7 is a state where the seated person is leaning on the backrest 50. The chair 201 is shown.

  In the chair 201 configured as described above, when a seated person leans on the backrest 50, a force from the seated person acts on the tension member 51 of the backrest 50, and the tension material 51 is applied to the back of the seated person by this force. Along the line, a substantially central part in the width direction is deformed into an arc shape so as to protrude rearward.

  Further, the vertical frame portions 53A and 53B to which the upholstery material 51 is fixed are elastically deformed so that the inner side in the width direction is directed rearward by the force acting from the upholstery material 51, and the inner side in the width direction so as to be close to each other. Move to.

  Moreover, the deformation | transformation permission part 242 of the backrest support part 240 connected with the vertical frame parts 53A and 53B can be elastically deformed according to the load which acts on the backrest 50 from a seated person's back. Therefore, the deformation | transformation permission part 242 deform | transforms so that it may incline back gradually as it goes upwards centering on the lower end. As the deformation allowing portion 242 is deformed, the upper connecting portion 43 disposed above the deformation allowing portion 242 moves rearward, and the backrest 50 connected to the upper connecting portion 43 further tilts backward. It becomes possible.

  In the chair 201 configured as described above, when a load acts on the backrest 50 from the seated person toward the back, the load of the seated person is transmitted to the backrest support member 240 that supports the backrest 50. At this time, in the backrest support member 240, the deformation allowing portion 242 provided between the lower connection portion 41 connected to the backrest support 20 and the upper connection portion 43 connected to the backrest 50 is provided. As it goes upward, it gradually deforms so as to incline backward. Along with the deformation of the deformation allowing portion 242, the backrest 50 supported by the backrest support member 240 can largely tilt the posture backward.

  Next, as shown in FIG. 4, the upper frame portion 52 has a main body in which a low step portion 54 a is formed in which a substantially entire region extending in the width direction X is stepped down with respect to another portion (vertical frame portion 53). A support member 54 (optional attachment portion) and an auxiliary support member 55 having a U-shape (see FIG. 4) in a cross-sectional view that is externally fitted to the lower step portion 54a of the main body support member 54 are provided.

  As shown in FIG. 4, the main body support member 54 has a mounting surface 54 g (see FIGS. 2, 8, and 9) that is bent in a substantially V shape so as to protrude downward, and toward the front side. The lower wall 54b projecting upward and the peripheral wall 54c (see FIG. 10) extending so as to incline forward gradually from the rear end of the lower wall 54b upwardly open. As shown in FIG. 10, the main body support member 54 protrudes forward from the front surface side of the peripheral wall 54 c, is provided with a plurality of rib pieces 54 d at intervals in the width direction X, and the center in the width direction X A bolt insertion hole 54e is formed at the front end of the. A bolt 66 for attaching the option member 60 is inserted into the bolt insertion hole 54e from the lower surface side. A nut 67 is screwed onto the bolt 66 on the inner peripheral surface side of the main body support member 54, and the option member 60 is fixed to the main body support member 54.

Here, attachment surfaces 63a and 65a (described later) of the option member 60 are attached to the attachment surface 54g of the lower wall 54b by surface contact.
Further, as shown in FIG. 2, positioning recesses 54h are formed in the lower wall 54b at positions on both sides of the lower surface 54b with the bolt insertion hole 54e in the width direction.
And as shown in FIG. 10, the notch step part 54f is formed in the lower end part of the surrounding wall 54c.

  As shown in FIG. 10, the auxiliary support member 55 has a front wall 55A and a rear wall 55B that are connected to each other on the upper side, has a U shape in a sectional view that opens downward, and an inner peripheral surface 55a of the rear wall 55B is a main body. The support member 54 is externally fitted to the low step portion 54a. That is, the fitting groove portion 56 is formed by the notch step portion 54 f and the inner peripheral surface 55 a of the rear wall 55 </ b> B of the auxiliary support member 55, and the end portion 51 a of the upholstery material 51 is fitted into the fitting groove portion 56. The auxiliary support member 55 has a shape in which an outer peripheral surface is curved from the rear wall 55B toward the front wall 55A. The edge 55c (see FIG. 4) of the front wall 55A is in contact with the upper surface of the lower wall 54b.

  The upholstery material 51 is sandwiched between the lower end portion of the peripheral wall 54c of the main body support member 54 and the inner peripheral surface 55a of the rear wall 55B of the auxiliary support member 55, and from the rear wall 55B on the outer peripheral surface of the auxiliary support member 55. It extends along the front wall 55A. The rib pieces 54d are in contact with the inner peripheral surface 55b of the front wall 55A of the auxiliary support member 55, respectively.

  In this case, the end portion 51 a of the upholstery material 51 is sandwiched between the rear peripheral wall 54 c of the main body support member 54 and the rear wall 55 B of the auxiliary support member 55, and the upholstery material 51 is the outer peripheral surface of the auxiliary support member 55. Since the rear wall 55B goes around to the front wall 55A side, the auxiliary support member 55 is pressed against the main body support member 54 in the arrow direction shown in FIG. Therefore, the main body support member 54 and the auxiliary support member 55 can be assembled without using screws, engagement means, or the like. Accordingly, it is possible to generate a clamping force (clamping force) between the main body support member 54 and the auxiliary support member 55 without using external means, and the end portion 51a of the tension member 51 is strongly clamped by both. can do.

(Optional material)
As shown in FIGS. 8 and 9, the option member 60 is fixed to the upper frame portion 52 via a headrest 60A that is directly fixed to the attached surface 54g of the main body support member 54 of the backrest 50, and the headrest 60A. Hanger 60B.

As shown in FIGS. 8, 9, and 11, the headrest 60 </ b> A includes a main body portion 61, a headrest tension material 62 (see FIGS. 1 and 10) stretched on the front surface of the main body portion 61, and a mounting surface. A backrest mounting portion 63 having a mounting surface 63a that engages with the 54g convex portion.
The main body 61 has an upper frame 61A and a lower frame 61B extending along the width direction X, and a pair of vertical frames 61C that connect both ends of the upper frame 61A and both ends of the lower frame 61B in a frame shape. It is integrally molded. The main body 61 is formed in a substantially trapezoidal shape such that the pair of vertical frames 61C are gradually inclined toward the center in the width direction X as they go from both ends of the lower frame 61B to both ends of the upper frame 61A.
Each of the pair of vertical frames 61C is curved so as to be convex toward the front as a whole. That is, the vertical frame 61 </ b> C is formed so as to gradually move forward as it goes upward, and gradually toward the rear as it goes upward from the central portion in the vertical direction.

  The backrest mounting portion 63 extends along the width direction X and extends upward from the rear end in the front-rear direction Y of the first mounting plate 63A having the mounting surface 63a and the first mounting plate 63A. A second mounting plate 63B that contacts the rear wall 55B of the support member 55 from the rear, and is formed in a substantially L shape by the first mounting plate 63A and the second mounting plate 63B in a side view. The second attachment plate 63B is connected to the lower frame 61B of the main body 61. The mounting surface 63a of the first mounting plate 63A is formed to be convex downward so as to be fitted to the mounted surface 54g described above. And the bolt hole 63b (refer FIG. 8) is formed in the center part of the width direction X of 63 A of 1st attachment plates. On the mounting surface 63a of the first mounting plate 63A, a positioning convex portion 63c that fits into the positioning concave portion 54h (see FIG. 2) formed in the above-described mounted surface 54g is formed. Further, a positioning recess 63d into which a positioning protrusion 65c (see FIG. 12) of a hanger 60B described later is fitted is formed on the lower surface side of the first mounting plate 63A.

  Here, the headrest 60A of the present embodiment is directly attached to the attachment surface 54g, but is attached indirectly via the first attachment plate 63A of another optional member 60 such as a hanger 60B described later. It is also possible to attach to the surface 54g.

As shown in FIGS. 8, 9, and 12, the hanger 60B includes a main body portion 64 and a backrest mounting portion 65 having a mounting surface 65a that engages with the convex portion of the mounted surface 54g. . The main body portion 64 has a support portion 64b extending from the base portion 64a located at the center in the width direction X toward both sides.
The backrest mounting portion 65 extends along the width direction X and extends upward from the rear end in the front-rear direction Y of the first mounting plate 65A having the mounting surface 65a and the first mounting plate 65A. A second mounting plate 65B that contacts the peripheral wall 54c of the support member 54, and is formed in a substantially L shape by the first mounting plate 65A and the second mounting plate 65B in a side view. The second mounting plate 65 </ b> B is connected to the base portion 64 a of the main body portion 64. The mounting surface 65a of the first mounting plate 65A is formed so as to protrude downward so as to be fitted to the mounted surface 54g described above. And the bolt hole 65b is formed in the center part of the width direction X of 65 A of 1st attachment plates. On the mounting surface 65a of the first mounting plate 65A, a positioning convex portion 65c that fits into the positioning concave portion 63d formed in the first mounting plate 63A of the headrest 60A described above is formed.

Next, the effect | action of the chair mentioned above is demonstrated in detail based on drawing.
As shown in FIGS. 8 and 10, in the present embodiment, the mounting surfaces 63 a and 65 a of the headrest 60 </ b> A of the option member 60 and the hanger 60 </ b> B are convex portions of the mounted surface 54 g of the body support member 54 of the backrest 50. Since the matching concave shapes are formed, the mounting surfaces 63a and 65a can be fitted to the mounting surface 54g with the concave and convex portions, and the option member 60 can be easily aligned in the width direction X. The option member 60 can be efficiently attached to the backrest 50.

And in the chair of this Embodiment, the attachment part of the attachment surfaces 63a and 65a and the to-be-attached surface 54g becomes surface contact, and it attaches compared with the case of a plane by making the to-be-attached surface 54g convex. Since the area can be increased, the attachment strength can be increased, and the attachment state of the option member 60 can be stabilized. In particular, by providing the attached surface 54g of the backrest 50 in the entire region in the width direction X, the width dimension of the attached surface 54g can be made longer than the attachment surfaces 63a and 65a of the option member 60. Therefore, the attachment state can be stabilized as compared with the case where the width dimension of the attachment surface 54g is shorter than the attachment surfaces 63a and 65a.
Moreover, in the chair according to the present embodiment, the mounted surface 54g is convex downward, so that a so-called truss effect can be provided, and the strength of the mounted surface 54g is increased.

  Further, in the present embodiment, as the backrest 50 is supported by the portion where the option member 60 is not deformed (here, the upper frame portion 52 (main body support member 54, auxiliary support member 55)), as described above, Since the building frame portions 53A and 53B, the upholstery material 51, and the connecting pieces 43A and 43B can be deformed and follow the movement of the seated person's back, the option member 60 itself is firmly supported by the upper frame portion 52. The chair 1 can be used more suitably.

  The mounted surface 54g and the mounting surfaces 63a and 65a are surfaces facing each other in the vertical direction, and the mounting surfaces 63a and 65a of the option member 60 can be mounted in the vertical direction with respect to the main body support member 54. Since it does not protrude toward the front side of the droop 50, there is an advantage that the attachment portion does not hit the back of the person seated on the chair 1.

  Further, since the backrest mounting portion 63 of the headrest 60A is formed in an L shape in sectional view by the first mounting plate 63A and the second mounting plate 63B, this L-shaped portion is used as the peripheral wall 54c of the main body support member 54. The headrest 60 </ b> A can be easily attached simply by applying to the rear from above. At this time, since the second mounting plate 63B contacts the rear end surface of the peripheral wall 54c, the backrest mounting portion 63 of the headrest 60A can be positioned in the front-rear direction Y with respect to the main body support member 54 of the backrest 50. Note that the hanger 60B can be easily attached to the hanger 60B simply by applying the second attachment plate 65B to the second attachment plate 63B of the headrest 60A in the same manner as the headrest 60A.

 In addition, since the positioning concave portions 54h and 63d and the positioning convex portions 63c and 65c are fitted to the mounting surfaces 63a and 65a of the option member 60 and the mounted surface 54g of the backrest 50, the mounting surface 63a is formed. , 65a and the mounting surface 54g can be more easily fitted.

 Further, the backrest 50 has a configuration in which a tension member 51 is stretched on the front surface side of the frame member including the upper frame portion 52, and the upper frame portion 52 is exposed on the rear side. The main body support member 54 can be easily attached by accessing from behind.

  Further, the mounting surfaces 63 a and 65 a of the backrest mounting portions 63 and 65 of the headrest 60 </ b> A and the hanger 60 </ b> B can be attached to the mounted surface 54 g of the main body support member 54 in the vertical direction.

  As described above, in the chair according to the present embodiment, the option member 60 such as the headrest 60A and the hanger 60B is firmly and easily attached to the backrest 50 by increasing the area of the attached surface 54g on the backrest 50 side. be able to.

  As mentioned above, although embodiment of the chair by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning.

  For example, in the present embodiment, the attachment surface 54g of the main body support member 54 (option attachment portion) has a substantially V-shape that protrudes downward, but is not limited to such a configuration. . For example, the mounted surface 54g may be convex upward, and the mounting surface of the option member may be concave upward (convex downward).

  Further, the attachment surface of the option attachment portion and the attachment surface of the option member are not limited to a substantially V-shaped shape that protrudes downward or upward, and each surface is curved along the width direction. May be. In this case, since the mounting surface of the option mounting portion forms a curved surface, the mounting surface of the option member can be moved in the width direction along the mounting surface, and the fine adjustment during positioning is possible. There is.

  Further, in this embodiment, the headrest 60A and the hanger 60B are adopted as the option member 60, but only one of them may be used, or another option member may be used, and the backrest is further backrested. The number of optional members to be attached is not limited to 2, and a configuration in which three or more optional members are attached is also possible.

  Further, in the present embodiment, the mounting surface on the backrest side is provided on the upper frame portion 52 of the backrest 50 made of a frame member, but is not limited to such a frame member, An appropriate configuration that functions as a backrest can be employed.

  Furthermore, in the present embodiment, the main body support member 54 is formed with the low step portion 54a, and the auxiliary support member 55 is externally fitted to the low step portion 54a. The main body support member 54 and the auxiliary support member 55, the end portion 51a of the upholstery material 51 is clamped, but the configuration is not limited to this. In short, it suffices if the option mounting portion is provided with a mounting surface that is convex toward at least one of the upper side and the lower side.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with known constituent elements without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Chair 10 Leg 20 Backrest support body 30 Seat part 40 Backrest back support member 50 Backrest 51 Upholstery material 52 Upper frame part 54 Main body support member (option attachment part)
54a Low step portion 54b Lower wall 54c Peripheral wall 54d Rib piece 54e Bolt insertion hole 54f Notch step portion 54g Mounted surface 54h Positioning recess 55 Auxiliary support member 55A Front wall 55B Rear wall 60 Optional member 60A Headrest 60B Hanger 61, 64 Body portion 62 Upholstery material for headrest 63, 65 Backrest mounting portion 63A, 65A First mounting plate 63B, 65B Second mounting plate 63a, 65a Mounting surface 63c, 65c Positioning convex portion 63d Positioning concave portion X Chair width direction Y Chair longitudinal direction

Claims (6)

A chair with an optional member attached to the backrest,
The backrest includes an option mounting portion that extends along the width direction of the chair and has a mounting surface that is convex toward at least one of the upper and lower sides,
The option member includes a backrest mounting portion having a mounting surface that engages with the mounted surface. The backrest mounting portion is
A first mounting plate extending along the width direction and having the mounting surface;
A second mounting plate that extends upward from the rear end in the front-rear direction of the first mounting plate and contacts the rear side surface of the option mounting portion;
The chair according to claim 1, comprising:   The positioning convex part is formed in any one of the said to-be-attached surface and the said mounting surface, and the positioning recessed part fitted to this positioning convex part is formed in the other, The Claim 1 or 2 characterized by the above-mentioned. Chair. The backrest is configured by stretching a tension member on a frame member provided with an upper frame portion extending in the width direction at least above,
The chair according to any one of claims 1 to 3, wherein the upper frame portion is the option mounting portion.   The chair according to any one of claims 1 to 4, wherein the plurality of option members are attached to the option attachment portion with the attachment surfaces of the backrest attachment portions overlapped in the vertical direction.   The chair according to any one of claims 1 to 5, wherein the mounted surface and the mounting surface are curved along the width direction.

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