JP2020130965A - Chair - Google Patents

Abstract

To provide a flip-up chair in which a connecting member which serves as a center of a rotation of a seat and urging means can be arranged in a space-efficient manner.SOLUTION: A chair of the present invention includes: a support structure having a pair of legs spaced apart in a width direction of the chair and a connecting member extending in the width direction and connecting the pair of legs in the width direction; a seat rotatably supported to the support structure; and a seat rotating mechanism which rotates the seat with respect to the support member. The seat rotating mechanism includes: a seat support member which supports the seat and pivotally supported to the connecting member, in which an inner space in which the connecting member is provided is formed; urging means provided on a rear side of the connecting member in the inner space of the seat support member and which urges the seat around an axis of the connecting member so as to upwardly rotate; and an operated part in which at least a part of the urging means projected and exposed to outside of the seat support member has a function of being capable of adjusting an urging force against the seat.SELECTED DRAWING: Figure 3

Description

The present invention relates to a chair.

Conventionally, in chairs installed in theaters, halls, stadiums, etc., flip-up chairs in which the seat rotates upward have been known. As those belonging to the above technical fields, for example, the chairs disclosed in Patent Documents 1 and 2 below are known.
First, the chair disclosed in Patent Document 1 is arranged around a seat portion (seat) pivotally supported by a base portion (support structure) via a shaft (connecting member), and the seat portion is attached upward. It is equipped with a urging torsion coil spring (a urging means). The seat is urged upward for the purpose of securing a passage on the front side, and is configured to always face upward when there is no seating load. The seat portion has a space in a rectangular outer frame, and a shaft and a torsion coil spring are arranged in this space. The end of the torsion coil spring is exposed from the outer frame of the seat, and the urging force can be adjusted by adjusting the position of this end in the thickness direction of the seat in a plurality of steps. With such a configuration, the flip-up speed of the seat can be adjusted.

Japanese Unexamined Patent Publication No. 2013-106933 Japanese Unexamined Patent Publication No. 2001-104805

On the other hand, as disclosed in Patent Document 2, a pair of seat supports (seat support members) are pivotally supported on a tubular horizontal bar (support structure) in a leg frame (support structure), and the seat support is seated on the seat support. A chair is also known in which a (seat) is supported so as not to rotate relative to each other and a spring (a urging means) is arranged inside the seat support body. From the viewpoint of improving the appearance of such a seat support, only the portion around the rotation axis is formed thick, but the other portions are formed thin. Therefore, as disclosed in Patent Document 1, it is difficult to adopt a means for adjusting the flip-up speed of the seat.

One aspect of the present invention has been made in view of the above-mentioned problems of the prior art, and in the flip-up chair, the connecting member and the urging means, which are the centers of rotation of the seat, are arranged in a space-efficient manner. The purpose is to provide a chair that can be used.

The chair of one aspect of the present invention is a support structure including a pair of legs separated in the width direction of the chair and a connecting member extending in the width direction and connecting the pair of legs in the width direction. A seat that is rotatably supported by the support structure and a seat rotation mechanism that rotates the seat with respect to the support structure, and the seat rotation mechanism is the seat. The seat support member is supported and pivotally supported by the connecting member, and an internal space in which the connecting member is arranged is formed, and the seat support member is arranged behind the connecting member in the internal space of the seat supporting member. At the same time, at least a part of the urging means for urging the seat to rotate upward around the axis of the connecting member and at least a part of the urging means protruding to the outside of the seat support member are exposed. It is characterized by including an operated portion having a function of adjusting the urging force against the object.

According to this configuration, since the urging means for rotating the seat can be accommodated by utilizing the internal space of the seat support member, the appearance of the flip-up chair can be improved. Further, the urging means of the seat rotation mechanism is arranged behind the connecting member in the internal space of the seat supporting member, and the urging means and the connecting member are arranged in the front-rear direction of the chair to form a seat. These can be arranged space-efficiently without occupying the space in the thickness direction.

In the chair of one aspect of the present invention, the seat support members are arranged in pairs separated from each other in the width direction, and each of the operated portions of each seat support member faces outward from each seat support member. The configuration may be such that the width direction is opposite to each other or projects downward.

According to this configuration, the operated portion can be arranged by utilizing the space under the seat, and it is possible to prevent interference with other parts of the chair.

In the chair of one aspect of the present invention, the seat support member has a pair of side wall portions that are separated in the width direction and form the internal space between the facing surfaces, and the cover is arranged in the internal space. A part of the operating portion may be configured so as to protrude inward in the width direction from the side wall portion located inside the width direction of the pair of side wall portions.

According to this configuration, the operated portion can be arranged in the space formed between the pair of seat supporting members separated in the width direction below the seat, so that the operated portion constitutes the chair. It is possible to further prevent interference with the site.

In the chair of one aspect of the present invention, the seat rotation mechanism extends behind the connecting member in the axial direction of the connecting member and is connected to the operated portion to which a part of the urging means is connected. A first gear mounted on the connecting member and a second gear mounted on the operated portion and meshing with the first gear are further provided, and the operated portion includes the first gear and the second gear. It is possible to displace along the width direction between the first position where the gears mesh with each other and the second position where the meshing between the first gear and the second gear is disengaged, and at the second position, the urging means The urging force may be adjustable.

According to this configuration, the operated portion is displaced in the width direction of the chair and moved from the first position where the gears mesh with each other to the second position where these meshes are released, so that the operated portion is mounted on the operated portion. The rotation of the second gear becomes free, and the urging force of the urging means can be adjusted by operating the operated portion. In addition, after adjusting the urging force, the operated portion is moved to the first position while maintaining that state, and the second gear is meshed with the first gear to regulate the rotation of the second gear. At the same time, it becomes possible to rotate the seat in the flip-up direction by the urging force stored in the urging means.

In the chair of one aspect of the present invention, the operated portion may be configured to rotate about an axis in the direction in which the urging force of the urging means is stored.
According to this configuration, it is possible to appropriately adjust the urging force of the urging means by rotating the operated portion to which a part of the urging means is connected around the axis thereof.

According to the present invention, it is possible to provide a flip-up chair in which the connecting member and the urging means, which are the centers of rotation of the seat, can be arranged in a space-efficient manner.

FIG. 1 is a perspective view of the chair according to the embodiment of the present invention as viewed from the front and the outside. FIG. 2 is a view of the chair from the side. FIG. 3 is a perspective view showing the skeleton structure of the chair. FIG. 4 is an exploded perspective view showing the configuration of the chair. FIG. 5 is an enlarged perspective view showing the structure of the connecting portion between the leg and the Axis. It is a perspective view which shows the main part structure of the seat support member. FIG. 6B is a view of the seat support member viewed from the inside in the width direction. FIG. 6C is a perspective view showing the configuration of the bearing member. FIG. 7A is a top view showing a configuration of a main part of the seat rotation mechanism, and is a diagram showing a state “first position” before displacement of the operated portion. FIG. 7B is a diagram showing a state “second position” after displacement of the operated portion in the seat rotation mechanism. FIG. 8 is a cross-sectional view of the seat support member viewed from the inside in the width direction. FIG. 9A is a perspective view of the configuration of the seat body when viewed from the upper surface side. FIG. 9B is a perspective view of the configuration of the seat body when viewed from the lower surface side. FIG. 10 is a perspective view showing a connection structure between the pair of seat rotation mechanisms and the seat body. FIG. 11A is a diagram showing the configuration of the reaction force adjusting mechanism of the first modification. FIG. 11B is a diagram showing the configuration of the reaction force adjusting mechanism of the modified example 2. FIG. 11C is a diagram showing the configuration of the reaction force adjusting mechanism of the modified example 3. FIG. 11D is a diagram showing the configuration of the reaction force adjusting mechanism of the modified example 4.

Hereinafter, a mode for carrying out the chair according to the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to this embodiment. In each of the following drawings, in order to make each component easy to see, the scale of the dimension may be different depending on the component.

In the following description, the orientations such as front-back, up-down, left-right, etc. are the front side of the seated person seated in the normal posture on the chair 1 installed on the horizontal floor surface (chair installation surface) F unless otherwise specified. Is "front" and the opposite side is "rear", and the up, down, left, and right directions are the same as when viewed from the seated person. When the seated person is seated in the normal posture, the seat 3 of the chair 1 is in the use position P1 described later, and unless otherwise specified, the orientation used in the description of the seat 3 is the same as the orientation in the use position P1. In the figure, the arrow UP indicates upward, the arrow FR indicates forward, and the arrow LH indicates left.

<Whole chair>
FIG. 1 is a perspective view of the chair according to the embodiment of the present invention as viewed from the front and the outside. FIG. 2 is a view of the chair from the side. FIG. 3 is a perspective view showing the skeleton structure of the chair. FIG. 4 is an exploded perspective view showing the configuration of the chair.

As shown in FIGS. 1 and 2, in the chair 1 of the present embodiment, the seat 3 forming the seat surface 3a is used with the use position (seating position, see FIG. 1) P1 with the seat surface 3a facing upward. It is a seat flip-up type chair 1 that can rotate between the flip-up position (retracted position, see FIG. 2) P2 in which the front end portion is moved upward with respect to the position P1.

As shown in FIGS. 1 to 3, the chair 1 includes a seat 3, a backrest 4 located behind the seat 3 and receiving the back of a seated person, and a support structure 7 that supports the seat 3 and the backrest 4. A seat rotation mechanism 15 that is supported by the support structure 7 and rotates the seat 3 is provided.

The support structure 7 includes a pair of left and right legs 2 that are arranged apart from each other in the left-right direction (width direction of the chair 1). In the following description, the pair of left and right leg bodies 2 may be referred to as left and right leg bodies 2. The seat 3 and the seat rotation mechanism 15 are arranged between the left and right leg bodies 2. The backrest 4 is arranged behind the seat 3 between the left and right legs 2.

<Support structure>
As shown in FIG. 1, the support structure 7 supports the seat 3 and the backrest 4. The support structure 7 is attached to a pair of legs 2 that are separated from each other in the width direction of the chair 1, a pivot (connecting member) 61 that connects the pair of legs 2 in the width direction, and both sides of the pivot 61 in the axial direction. It is provided with a pivot support 62 and the like.

As shown in FIGS. 1 to 3, the left and right leg bodies 2 are installed on the ground plane F. Each of the left and right leg bodies 2 has a leg component portion 201 and a connecting rod portion 30 that constitutes the armrest 5.
The leg component 201 includes front legs 20 and rear legs 25 that are separated from each other in the front-rear direction and extend in the vertical direction, and a support member 35 that connects them.

The front legs 20 and the rear legs 25 are connected to each other via the support member 35 provided between the upper and lower intermediate portions. The "intermediate" in the present application is not limited to the center between both ends of the target component, but includes a portion inside between both ends. When the chair 1 stands on the ground plane F, the front-rear direction of the chair 1 is the depth direction of the chair 1. The front side in the front-rear direction corresponds to the front side in the depth direction, and the rear side in the front-rear direction corresponds to the back side in the depth direction.

The left and right support members 35 provided on each of the left and right leg bodies 2 are members that support the left and right side portions of the seat 3 and the left and right side portions of the backrest 4, respectively. The left and right support members 35 are located behind the front end portion of the seat 3 at the use position P1 (see the front end position P3 in FIG. 2), and the seat 3 can be rotated so that the front end portion side of the seat 3 can be flipped up. I support it. The left and right support members 35 are located in front of the rear end portion of the seat 3 (see the rear end position P4 in FIG. 2).

Further, the rotation center axis C1 of the left and right support members 35 and the seat 3 is located behind the center of the seat 3 in the front-rear direction. The left and right support members 35 are located below the seat surface 3a (FIG. 1) of the seat 3 at the use position P1.

As shown in FIGS. 3 and 4, the front legs 20 and the rear legs 25 are separated from each other in the front-rear direction of the chair 1 and extend in the vertical direction. The front leg 20 and the rear leg 25 each form a leg rod having a rectangular (rectangular) cross-sectional shape with a cross section orthogonal to the length direction. The upper ends of the front legs 20 and the rear legs 25 extend upward from the seat 3 and are connected to each other by the connecting rod portion 30. The connecting rod portion 30 constitutes an armrest 5.

For example, the connecting rod portion 30 is integrally molded by aluminum die casting or the like together with the portions of the front leg 20 and the rear leg 25 near the connecting rod portion 30. The remaining portions of the front leg 20 and the rear leg 25 are formed by, for example, bending a square steel pipe.

As shown in FIG. 3, the lower inclined portion 23b located in the vertical intermediate portion of the steel pipe portion 2B of the front leg 20 and the upper portion of the steel pipe portion 2C of the rear leg 25 are connected to each other via a support member 35. ..
As shown in FIG. 4, the support member 35 has a plate shape orthogonal to the width direction, and has a side wall portion 36 arranged so as to overlap the front leg 20 in the front-rear direction view and a side wall portion 36 in the width direction from the trailing edge portion of the side wall portion 36. It includes a rear wall portion 37 projecting inward, and a tubular pivot support portion 32 located in the inner central portion of the side wall portion 36 and projecting inward in the width direction.

Further, the support member 35 includes a front lower fastening portion 38 and a rear lower fastening portion 39 that support the backrest support frame 8 of the backrest 4.
The front lower fastening portion 38 is provided behind the front leg 20 and adjacent to the front of the pivot support portion 32 of the support member 35, and is provided perpendicular to the side wall portion 36. The upper side of the front lower fastening portion 38 is tilted backward along the inclination of the back frame main body (first frame member) 8a constituting the backrest support frame 8, and is located inside the side surface of the front leg 20 in the width direction. The entire front surface is opposed to the front lower fastening plate 8a1 of the back frame main body 8a. The lower end portions 8a3 of the back frame main body 8a are supported by the left and right front lower fastening portions 38 on the inner side in the width direction of the left and right leg bodies 2, respectively.

The rear lower fastening portion 39 projects inward in the width direction from the side surface of the rear leg 25, and is located further inward in the width direction than the front lower fastening portion 38. The rear lower fastening portion 39 is inclined forward along the inclination of the support frame (second frame member) 8b constituting the backrest support frame 8, and the entire rear surface is the rear lower fastening plate of the support frame 8b. It faces the front surface of 8b1.

The pair of front lower fastening portions 38 and rear lower fastening portions 39 support the lower end portions 8a3 and 8b3 of the back frame main body 8a and the support frame 8b at different positions in the front and rear of the leg body 2, so that the backrest is supported. The load concentrated on the fastening portion between the support frame 8 and the support structure 7 can be distributed to the front and rear of the support structure 7.

The support member 35 is provided, for example, by welding to the front legs 20 and the rear legs 25. Specifically, the front edge portion of the side wall portion 36 is connected to the rear surface side of the upper and lower intermediate portions of the front leg 20 by welding or the like, and is supported by the front leg 20. The inner edge portion of the rear wall portion 37 is connected to the front edge portion of the upper and lower intermediate portions of the rear leg 25 by welding or the like, and is supported by the rear leg 25.

With reference to FIGS. 1 to 4, the front legs 20 and the rear legs 25 form a rod shape that is separated from each other in the front-rear direction at least below the support member 35 and the seat 3. The ground contact ends 21 and 26 on the lower end side of the front leg 20 and the rear leg 25 are portions that come into contact with the ground contact surface F, respectively. As shown in FIG. 2, the front leg 20 is located between the front end position P3 of the seat 3 at the use position P1 and the rotation center axis C1. The ground contact end 21 of the front leg 20 extends forward along the ground contact surface F in order to provide a ground contact position as forward as possible.

The front leg 20 includes a front leg vertical rod portion 23 extending upward from the rear end portion 21b of the ground contact end portion 21 in the vertical direction. The portion of the front leg 20 including the ground contact end portion 21 and the front leg vertical rod portion 23 is formed in an L shape in the side view shown in FIG. Since the portion of the front leg 20 reaching the ground contact end 21 is designated as the front leg vertical rod portion 23, as shown in FIG. 2, in the stored state where the unused seat 3 is in the flip-up position P2, the seat 3 at the time of storage The front leg vertical rod portion 23 is located at a position equal to or slightly forward of the back surface 3B in the front-rear direction, so that an area can be secured in front of the chair 1. As a result, the front legs 20 are retracted from the area where the lower limbs of the seated person move, and it becomes easier to walk in front of the chair 1.

With reference to FIG. 2, the hind legs 25 extend linearly from the upper and lower intermediate portions connecting the support members 35 to the lower rear in a lateral view. The ground contact end portion 26 on the lower end side of the rear leg 25 is arranged in a region behind the rear end position P4 of the seat 3 at the use position P1. The ground contact end portion 26 of the rear leg 25 is arranged at a position in the front-rear direction equivalent to the upper rear end position P5 of the backrest 4 that tilts backward.

The left and right armrests 5 are composed of, for example, a connecting rod portion 30. The upper surface of the connecting rod portion 30 forms an elbow resting surface 5a on which the forearm of the seated person is placed. The left and right armrests 5 are arranged apart from each other above the support member 35 on the same side. As a result, a space is formed below the left and right armrests 5, and the operator can easily grip the armrests 5 when transporting the chair 1. In addition, the weight of the leg body 2 can be reduced.

The left and right armrests 5 may include a pad member or the like attached to the left and right connecting rod portion 30. The molded portion 2A including the connecting rod portion 30 is not limited to a metal material such as an aluminum alloy, and may be formed of a synthetic resin material.

As shown in FIGS. 3 and 4, the pivot axis 61 is arranged inside the left and right leg bodies 2 in the width direction, has the axis C1 as the axis center, and extends linearly along the width direction. The pivot 61 connects the left and right leg bodies 2 which are arranged apart from each other in the width direction. Both ends of the pivot 61 are located in the left and right spaces K1 of the backrest support frame 8 described later, and are connected to the left and right connecting rods 30 via the pivot support 62 described later. The pivot 61 is fixed to the pivot support 62 via fixing plates 51 provided on both ends in the length direction.

The pivot 61 is attached to the inside of each support member 35 in the left and right leg bodies 2 via the respective pivot support (connecting member support) 62 provided on both end sides. The pivot support 62 is fixed to the inner surface side of the side wall portion 36 of the support member 35 by using a bolt or the like. The pivot support 62 has a support body 62A having a bottomed cylindrical shape centered on the axis C1, and is arranged so that one end side of the support body 62A opens toward the inside in the width direction (left seat rotation mechanism 15). Has been done.

The pivot support 62 has a front fastening portion 62B that is bent and formed so as to project forward from the outer peripheral surface of the support body 62A. The front fastening portion 62B faces the front lower fastening portion 38 of the support member 35 at a predetermined distance, and the lower end portion 8a3 of the back frame main body 8a is placed in the gap formed between the front fastening portion 62B and the front lower fastening portion 38. Assembled in the inserted state.

The end of the pivot 61 is fixedly supported by the pivot support 62 with, for example, a bolt or the like, with the fixing plate 51 inserted into the pivot support 62.

FIG. 5 is an enlarged perspective view showing the structure of the connecting portion between the leg and the Axis.
Specifically, as shown in FIGS. 4 and 5, the pivot support 62 projects radially from the outer end in the width direction of the support body 62A and has three fixing portions 62C arranged at equal intervals around the axis. (In FIG. 4, only two are shown), and they are screwed to the support member 35 via bolts 62b inserted into the bolt insertion holes of each fixing portion 62C. Since the pivot support 62 increases the contact area of the pivot 61 with respect to the support member 35, the pivot 61 can be stably attached to the left and right legs 2.

A semicircular first gear 64 in the axial direction is fixed to a portion of the pivot 61 inside the pivot support 62 in the width direction. The first gear 64 forms a gear portion centered on the axis C1 on a semicircular outer peripheral portion. A flat plate-shaped restraining member 64A that prevents the reverse rotation of the first gear 64 is attached to the axial plane side of the first gear 64, and is semicircular with the pivot 61 inserted inside. Both ends of the gear portion 64a are connected.

<Backward>
As shown in FIGS. 1 to 4, the backrest 4 is inclined rearward and upward behind the seat 3, receives the back of the seated person, and supports it from the rear. The backrest 4 has a curved shape that is convex rearward toward the lower side. The curved shape of the lower part of the backrest 4 is formed so as to follow the curvature of the lumbar region of the seated person, and enhances the supportability of the lumbar region of the seated person. The lower portion of the backrest 4 is fixed and supported at different positions in the front and rear of the left and right leg bodies 2.

The backrest 4 includes a backrest support frame 8 (FIG. 3) supported by the support structure 7, a tension member (back support member) 9 supported by the backrest support frame 8 and receiving the back of the seated person, and a back. It includes a back plate 10 (FIG. 3) supported by a leaning support frame 8.

The backrest 4 is configured by stretching the mesh-shaped tension member 9 shown in FIG. 1 on the backrest support frame 8 shown in FIG. 4, and the backrest surface 4a is formed on the front surface side of the tension member 9. The back plate 10 is attached to the inside of the backrest support frame 8 and is covered with the upholstery 9 together with the backrest support frame 8.

As shown in FIGS. 3 and 4, the backrest support frame 8 includes a U-shaped back frame main body (first frame member) 8a that opens downward in a front-rear direction, and left and right sides of the back frame main body 8a. A pair of left and right support frames (second frame members) 8b that support the lower portion from the lower rear and a connecting frame 8c that connects the lower ends of the left and right support frames 8b are provided. Each of the back frame main body 8a, the left and right support frames 8b, and the connecting frame 8c is formed by, for example, bending a circular steel pipe.

The back frame main body 8a extends in the vertical direction along the backward tilt angle of the backrest 4 and stands upright. The U-shaped back frame main body 8a has a pair of side portions 8A1 separated to the left and right, and an upper connecting portion 8A2 for connecting the upper portions of these side portions 8A1. The back frame main body 8a is inclined so that the upper connecting portion 8A2 side is located behind the lower end portion 8a3.

The arrangement position of the left and right support frames 8b with respect to the back frame main body 8a is along the curved shape of the backrest 4. In the present embodiment, each of the left and right support frames 8b is located behind the back frame main body 8a in the front-rear direction of the chair 1 and is fixed to the back frame main body 8a in a state of being adjacent to each other in the width direction. ..

Each of the left and right support frames 8b is adjacent to the side portion 8A1 of the back frame main body 8a and extends vertically along the side portion 8A1 from the upper inclined portion (extended portion) 8B1 and the lower portion of the upper inclined portion 8B1. It has a downwardly inclined portion 8B2 that inclines downward and rearward through the bent portion q. As described above, the lower inclined portion 8B2 of the support frame 8b is inclined at a predetermined angle with respect to the upper inclined portion 8B1 and is separated rearward from the lower end portion 8a3 of the back frame main body 8a.

On the other hand, at least a part of the upper inclined portion 8B1 is connected to the side portion 8A1 of the back frame main body 8a by welding or the like. As described above, the lower end portions 8a3 and 8b3 of the back frame main body 8a and the left and right support frames 8b are separated from each other in the front-rear direction (depth direction of the chair 1), and the space K1 formed between them ( Above FIG. 4), the entire or a part of the upper inclined portion 8B1 is welded and fixed to the back frame main body 8a. The lower end portion 8b3 of the lower inclined portion 8B2 is inclined so as to be located behind the portion fixed to the back frame main body 8a. As a result, the support force of the left and right support frames 8b for the back frame body 8a can be obtained.

In the present embodiment, for example, the length of the upper inclined portion 8B1 in the left and right support frame 8b is larger than the length of the lower inclined portion 8B2, and the upper inclined portion 8B1 is fixed to the back frame main body 8a over the entire length direction thereof. By doing so, the support force of the left and right support frames 8b with respect to the back frame main body 8a can be further increased, and the load from the seated person on the back frame main body 8a can be supported. Further, the left and right support frames 8b function as auxiliary support members for the backrest support frame 8, and the backrest support frame 8 can be supported so as to be stretched by the respective axial forces.

As shown in FIG. 2, the connecting frame 8c has an inclined posture that is tilted backward from the back frame main body 8a, and is formed in a U shape that opens forward as shown in FIGS. 3 and 4. The connecting frame 8c has a front end portion 8C1 separated to the left and right, and a connecting portion 8C2 connecting them. The left and right front end portions 8C1 of the connecting frame 8c are joined to the lower end portion 8b3 of the lower inclined portion 8B2 of the left and right support frame 8b by welding or the like. The connecting portion 8C2 of the connecting frame 8c is curved rearward so as to follow the curved shape of the lower end portion of the backrest 4.

Such a backrest support frame 8 is supported by the support structure 7. The backrest support frame 8 is supported by fixing the lower ends 8a3 and 8b3 of the back frame main body 8a and the left and right support frames 8b to the support members 35 of the left and right leg bodies 2, respectively.
Specifically, the lower front fastening plate 8a1 is fixed to the left and right lower end portions 8a3 of the back frame main body 8a by welding or the like. The front lower fastening plate 8a1 is a portion facing the front lower fastening portion (supported portion) 38 provided on the front side of the support member 35 of the left and right leg bodies 2 at the time of assembly, and is a portion facing the front lower fastening portion 38 with respect to the front lower fastening portion 38. It is fastened and fixed by bolts 8a2 screwed diagonally from the front upper part.

The rear lower fastening plate 8b1 is fixed to the lower end portion 8b3 of the lower inclined portion 8B2 of the left and right support frame 8b by welding or the like. The rear lower fastening plate 8b1 is a portion facing the rear lower fastening portion (supported portion) 39 provided on the support member 35 of the left and right leg bodies 2 at the time of assembly, and is in the width direction from the inner surface 35b side of the support member 35. It is fastened and fixed to the rear lower fastening portion 39 protruding inward by a bolt 8b2 screwed diagonally from the rear upper side.

Such a backrest support frame 8 also functions as a connecting member for connecting the left and right leg bodies 2 by the back frame main body 8a and the connecting frame 8c straddling the left and right sides.

The back plate 10 is composed of a plate-like member arranged in the area surrounded by the back frame main body 8a, and is curved rearward along the curved shape of the connecting frame 8c, that is, the curved shape of the lower end portion of the backrest 4. ing. In the back plate 10, each engaging portion 10a provided in the center of the left and right side portions is engaged with the upper end portion of the left and right support frame 8b, and is inserted into a plurality of connecting portions 10b provided on the lower end side. It is fixed to the connecting frame 8c by a spring.

<Seat rotation mechanism>
4 and 5 show the seat rotation mechanism 15 and the like on the right side of the chair 1 when viewed from the seated person. Hereinafter, the configuration on the right side shown in FIGS. 4 and 5 will be described and described on the left side. The configuration is symmetrical and the description thereof will be omitted.
As shown in FIGS. 4 and 5, each seat rotation mechanism 15 includes a pair of a seat support member 65 for attaching the seat 3 to the pivot 61 and a reaction force adjusting mechanism 16 housed in the seat support member 65. The bearing member 72 of the above is provided.

FIG. 6A is a perspective view showing a main configuration of the seat support member.
The seat support member 65 is arranged inside the pivot support 62 in the width direction, and supports the seat 3 from below. The seat support member 65 includes a seat frame pivot portion 65a that rotatably engages with the pivot support 62, a reaction force adjusting mechanism accommodating portion 65c adjacent to the inside of the seat frame pivot portion 65a in the width direction, and a reaction force. A frame extending portion 65b extending forward from the adjusting mechanism accommodating portion 65c is provided.

As shown in FIG. 4, the seat frame pivot portion 65a has a projecting shape in which the upper and lower sides of the cylindrical wall at the center of the axis C1 are partially cut out, and is inserted into the inner peripheral side of the pivot support 62. Have been placed. The seat frame pivot 65a is rotatably supported with respect to the pivot support 62. On the inner peripheral side of the pivot support 62, stoppers 62a that engage with the seat frame pivot portion 65a in the circumferential direction at each of the use position P1 and the flip-up position P2 of the seat 3 are provided, and the stopper 62a provides the stopper 62a. The rotation of the seat 3 is restricted between the use position P1 and the flip-up position P2, and the rotation of the seat 3 is restricted at the use position P1 and the flip-up position P2.

As shown in FIG. 5, the reaction force adjusting mechanism accommodating portion 65c has a container shape having a U-shaped cross section that opens upward, and an internal space K2 is formed inside. The reaction force adjusting mechanism accommodating portion 65c is configured to include a pair of side wall portions 65f separated in the width direction and a lower wall portion 65g connecting the lower portions of the left and right side wall portions 65f when the seat is in use. It has a concave shape that opens to the 3 side.

The rear end portions (rear end portions) 65p of the left and right side wall portions 65f are close to each other toward the rear and are connected so as to form an acute angle, so that the rear end side is narrowed. The rear side has a V-shape in a plan view, and the opening 65e side has a structure that is less likely to spread in the width direction than the front-rear center portion. As a result, the positional relationship of each member housed in the internal space K2 can be kept good.

The front side ends of the left and right side wall portions 65f are connected to each other via ribs 71 provided at the boundary with the frame extending portion 65b. The reaction force adjusting mechanism 16 is accommodated in the internal space K2 formed in the region surrounded by the pair of side wall portions 65f, the lower wall portion 65g, and the rib 71 with a spatial margin.

The frame extending portion 65b has a trapezoidal cross section that opens upward, and extends in front of the reaction force adjusting mechanism accommodating portion 65c. The frame extending portion 65b is a front wall portion connecting a pair of side wall portions 65h separated in the width direction, a lower wall portion 65j connecting the lower portions of the left and right side wall portions 65h, and front ends of the pair of side wall portions 65h. It is configured to have 65k. Further, the frame extending portion 65b has an engaging portion 65m having an engaging function with the seat 3 in the vicinity of the tip end side thereof.

The frame extending portion 65b is provided closer to the side wall portion 65f on the outer side in the width direction of the reaction force adjusting mechanism accommodating portion 65c. A plurality of ribs 71 are arranged at predetermined intervals in the inner space surrounded by the pair of side wall portions 65h and the lower wall portion 65j, so that the strength of the elongated frame extending portion 65b is secured. It has become.

The seat support member 65 has fixing portions 76 and 77 for fixing the seat support member 65 to the seat 3. The first fixing portion 76 is located on the rear side of the side wall portion 65f on the inner side in the width direction of the reaction force adjusting mechanism accommodating portion 65c, and is toward the inner side in the width direction (the other seat support member 65 side) from the side wall portion 65f. It has a rectangular plate shape that extends and has a bolt insertion hole 78 in the center. The second fixing portion 77 is provided near the boundary between the reaction force adjusting mechanism accommodating portion 65c and the frame extending portion 65b, adjacent to the frame extending portion 65b on the inner side in the width direction, and has a bolt insertion hole in the center. Has 78.

The seat support member 65 is in a state where the engaging portion 65m on the tip end side of the frame extending portion 65b is inserted into the engaging hole 75s (FIG. 3) on the seat 3 side and engaged with the fixed portions 76 and 77. It is fixed to the seat 3 via a bolt inserted into each bolt insertion hole 78.

As shown in FIGS. 4 and 6A, the seat support member 65 of the present embodiment has a U-shaped bearing portion for supporting the pivot 61 at a portion of the reaction force adjusting mechanism accommodating portion 65c that intersects the pivot 61. It has 65d. The bearing portion 65d is formed at each of the above-mentioned corresponding portions of the left and right side wall portions 65f, and supports a part of the pivot 61 in a state of being inserted into the internal space K2.

The bearing portion 65d is formed with a pair of engaged portions (first regulating means) 65n that project from the inner walls on both sides toward the pivot 61 side in the front-rear direction. The lower surface 65n1 of each engaged portion 65n is substantially parallel to the upper surface 65n2 of the seat support member 65.

FIG. 6B is a view of the seat support member viewed from the inside in the width direction.
As shown in FIG. 6B, the end side of the pivot 61 is inserted into the bearing portion 65d. As shown in FIG. 5, a pair of bearing members 72 are attached to the ends of the pivot 61 at predetermined intervals in the axial direction, and each of the bearing members 72 is attached to each bearing portion 65d of the seat support member 65. The pivot 61 and the pair of seat support members 65 are assembled by inserting the bearing members into the shaft 61.

FIG. 6C is a perspective view showing the configuration of the bearing member.
As shown in FIG. 6C, the bearing member 72 is formed by combining two bearing constituent members 73. The shapes of the bearing components 73 are equal to each other and are symmetrically combined via the axis C.

As shown in FIG. 6C, the bearing component 73 has a semicircular shape centered on the axis C, and has a pivot holding recess 73a formed in a size substantially equal to the outer diameter of the pivot 61. The bearing component 73, together with the pivot holding recess 73a of the other bearing component 73, partially covers the entire axial circumference in a part in the length direction of the pivot 61.

The bearing component 73 is further formed between a pair of overhanging portions 73b protruding outward in the radial direction from both sides in the thickness direction in the axial direction below the axis C, and a first overhanging portion 73b formed between the pair of overhanging portions 73b. The engaging groove 73f, the elastic engaging portion (first restricting means) 73c provided above the pair of overhanging portions 73b and elastically deformable, and the outside (front-back direction) provided above the elastic engaging portion 73c. ), A pair of engaging protrusions (second regulating means) 73d, a second engaging groove 73g formed between the pair of engaging protrusions 73d, and fixing to the other bearing component 73. It has a part 73e and.

The fixed portion 73e has an L-shape that protrudes from one side surface side toward the other bearing component 73 side and the tip thereof is bent in the thickness direction. The pair of bearing constituents 73 are combined from the outer peripheral side of the pivot 61 so as to form a circle by the pivot holding recesses 73a, and are fixed to each other by engaging the fixing portions 73e with each other. Is attached to.

The elastic engaging portion 73c extends upward from the upper end side of the pair of overhanging portions 73b toward the engaging convex portion 73d side. As shown in FIG. 6B, when the bearing member 72 is inserted into the bearing portion 65d of the seat support member 65, each elastic engaging portion 73c of the bearing member 72 is engaged with a pair protruding inward of the bearing portion 65d. It is elastically deformed toward the pivot holding recess 73a by the joint portion 65n, passes through the pair of engaged portions 65n, and then returns to the original shape to engage with the lower surface 65n1 of each engaged portion 65n. Each of the engaged portions 65n of the seat support member 65 functions as an upward stopper for the bearing member 72.

The bearing member 72 has a part of the left and right side wall portions 65f constituting the bearing portion 65d in the engaging grooves 73f and 73g formed between the overhanging portion 73b and the engaging convex portion 73d shown in FIG. 6C. It is held by the seat support member 65 in the inserted state. As a result, the overhanging portions 73b and the engaging convex portions 73d sandwich a part of the left and right side wall portions 65f forming the bearing portion 65d in the direction along the axis C, and are locked to the left and right side wall portions 65f. The overhanging portion 73b is locked to the side wall on the bottom side of the bearing portion 65d. The engaging convex portion 73d is locked to the engaged portion 65n of the bearing portion 65d.

In this way, a part of the bearing member 72 is locked to the left and right side wall portions 65f around the bearing portion 65d, so that the movement of the bearing member 72 in the axis C direction is restricted, and the bearing configuration with respect to the seat support member 65. The material 73 is positioned. The entire bearing member 72 is housed in the bearing portion 65d of the reaction force adjusting mechanism accommodating portion 65c, and the upper surface 72a of the bearing member 72 coincides with the upper surface 65n2 of the reaction force adjusting mechanism accommodating portion 65c.

As shown in FIG. 3, the reaction force adjusting mechanism 16 is a mechanism for urging the support structure 7 so as to rotate the seat 3 upward around the axis of the pivot 61, and is a mechanism for urging the seat support member 65. It is arranged in the internal space K2 of. It is preferable that the reaction force adjusting mechanism 16 is arranged in the internal space K2 between or near the rear side end portions 65p which are rearward of the pivot 61 and are connected to each other at the rear end.

FIG. 7A is a top view showing a configuration of a main part of the seat rotation mechanism, and is a diagram showing a state “first position” before displacement of the operated portion.
As shown in FIG. 7A, the reaction force adjusting mechanism 16 includes a spiral spring (urging member) 66, an operated portion 67, a second gear 68, and a first gear 64 attached to the pivot 61. Has been done.

FIG. 8 is a cross-sectional view of the seat support member viewed from the inside in the width direction.
As shown in FIG. 7A, the spiral spring 66 is arranged on one end 67b side of the operated portion 67 having a length in the width direction, and as shown in FIG. 8, the spiral spring 66 is spiraled around the operated portion 67. It is structured like a shape. The radial inner end 66a of the spiral spring 66 is inserted and held in the end holding hole 67c formed in the operated portion 67, and is locked so as not to rotate relative to each other. The radial outer end 66b of the spiral spring 66 is locked to the convex portion 65t provided on the lower wall portion 65j side of the reaction force adjusting mechanism accommodating portion 65c so as not to rotate relative to each other.

The second gear 68 is arranged inside the spiral spring 66 in the width direction, and is integrally rotatably supported by the operated portion 67. The second gear 68 has a gear portion 68a formed on the outer peripheral portion thereof. The gear portion 68a of the second gear 68 meshes with the gear portion 64a of the first gear 64 at the “first position” shown in FIG. 7A.

FIG. 7B is a diagram showing a state “second position” after displacement of the operated portion in the seat rotation mechanism.
The operated portion 67 is arranged in parallel with the pivot 61 at a position behind the pivot 61. The operated portion 67 is rotatably supported with respect to the left and right side wall portions 65f of the reaction force adjusting mechanism accommodating portion 65c. Further, in the present embodiment, the operated portion 67 has a “first position: FIG. 7A” in which the second gear 68 meshes with the first gear 64 mounted on the pivot 61 along the length direction, and the gear 64. , 68 are displaceably supported from the "second position: FIG. 7B" where the meshing between the gears is released.

The operated portion 67 has an insertion hole 65u (FIG. 6A) formed in a side wall portion 65f whose other end portion 67a in the length direction is inside in the width direction of the seat support member 65 in the width direction (the other seat). This end portion 67a, which protrudes toward the support member 65 side) and is exposed to the outside, is operated by an operator.

The end portion 67b on the opposite side in the length direction of the operated portion 67 is outside the seat support member 65 in the width direction when displaced from the “first position” shown in FIG. 7A to the “second position” shown in FIG. 7B. It is inserted into the operation portion rotation restricting portion 65r (FIG. 6A) formed of a U-shaped concave portion provided on the inner surface side of the side wall portion 65f. A pair of rotation restricting surfaces 67b1 facing each other via the axis C are formed around the axis of the end portion 67b, and when the operated portion 67 is displaced to the "second position", these rotation restricting surfaces are operated. By locking to the inner surface 65r1 of the portion rotation restricting portion 65r, the operated portion 67 rotates in the direction opposite to the direction in which the urging force of the spiral spring 66 is stored (the direction in which the seat 3 is urged). Can be prevented.

In such a configuration, when the second gear 68 is rotated by the spring force stored in the spiral spring 66, the second gear 68 rolls on the outer circumference of the first gear 64 and rotates the seat 3 from the used position P1 to the flip-up position P2. Move it. The spiral spring 66 is provided with an initial spring force capable of urging the seat 3 in the flip-up direction even when the seat 3 is in the flip-up position P2. When the seat 3 is lowered to the use position P1 by the seated person, the spiral spring 66 further applies the spring force from the initial spring force, and when the seated person stands up, the seat 3 is flipped up and rotated to the position P2. Let me.

When adjusting the flip-up speed of the seat 3, first, the operated portion 67 is pushed outward in the width direction of the chair 1 to release the engagement of the second gear 68 with the first gear 64, and after the displacement. The spiral spring 66 is twisted by turning the operated portion 67 in the direction of reducing the diameter of the spiral spring 66 (counterclockwise indicated by the arrow in FIG. 7B) at the “second position” of the above. With the spiral spring 66 twisted, the operated portion 67 is returned to the "first position" of the pulling source inward in the axial direction, and the second gear 68 is meshed with the first gear 64 again. It is possible to generate the desired urging force (reaction force). By adjusting the urging force against the seat 3 in this way, it is possible to adjust the flip-up speed of the seat 3.

In the present embodiment, as shown in FIG. 5, the upward opening 65e of the pair of seat support members 65 is closed by, for example, the seat body 75 constituting the seat 3.
As shown in FIG. 6A, the seat support member 65 is provided with a plurality of projecting portions 74 projecting upward, and the plurality of projecting portions 74 are inserted into the locking holes 75b of the seat body 75, respectively. The seat support member 65 is positioned with respect to the seat 3.

<Za>
FIG. 9A is a perspective view of the configuration of the seat body when viewed from the upper surface side. FIG. 9B is a perspective view of the configuration of the seat body when viewed from the lower surface side. FIG. 10 is a perspective view showing a connection structure between the pair of seat rotation mechanisms and the seat body.
As shown in FIGS. 1 and 3, the seat 3 has a rectangular thick plate shape in a plan view. The seat 3 includes a seat body 75 arranged on the pair of seat support members 65 described above, a cushion material 3b, and a skin material 3c, and the circumference of the cushion material 3b mounted on the seat body 75 is around. It is covered with a skin material 3c. For example, molded urethane is used as the cushion material 3b, slab urethane or the like is used as the skin material 3c.

As shown in FIG. 3, the seat 3 is rotatably supported by the support structure 7 via a pair of seat rotation mechanisms 15 arranged apart from each other on the left and right sides.

As shown in FIG. 9B, the rear end portion 75d of the seat body 75 has a curved shape that is convex rearward when viewed from the normal direction of the upper surface 75a with the seat 3 at the use position P1, and the backrest 4 It is formed so as to follow the curved shape in the plan view of the lower part of the. The left and right side portions 75c of the seat body 75 extend outward in the width direction toward the front end portion 75e side. A pair of engaging holes 75s are formed on both sides of the front end portion 75e in the width direction, and the engaging portion 65m on the tip end side of the seat support member 65 described above is inserted into each of the engaging holes 75s to engage. To do.

As shown in FIG. 9A, a support accommodating recess 75g that opens to the lower surface 75f side is formed on the rear end portion 75d side of the left and right side portions 75c. As shown in FIG. 9B, a part of the above-mentioned pivot support 62 is inserted and accommodated inside the support accommodating recess 75 g. The upper surface (bottom surface of the recess) of the support accommodating recess 75g has an arc shape in accordance with the cylindrical shape of the pivot support 62.

As shown in FIGS. 9A and 9B, a pair of telescopic portions 75h are formed on the seat body 75 at positions inside the left and right side portions 75c in the width direction so as to be separated from each other in the width direction. The pair of telescopic portions 75h are located closer to the rear including the vicinity of the center of the seat body 75, extend linearly in the front-rear direction of the seat body 75, and have a wavy cross-sectional shape along the width direction. Has been done. In the present embodiment, since the telescopic portion 75h is partially separated from the surrounding portion by a pair of openings 75j formed before and after the telescopic portion 75h, each telescopic portion 75h has a width due to a seating load from above. By extending in the direction, the region between the expansion and contraction portions 75h on the lower surface 75f of the seat body 75 can be flexed more downward. As a result, an appropriate cushioning property can be obtained.

As shown in FIG. 9B, a rear convex portion 75k forming a convex shape downward is formed on the rear end portion 75d side of the seat body 75, and is formed in the width direction over the arrangement interval of the pair of telescopic portions 75h. Extends to. With the left and right seat support members 65 fixed to the seat body 75, the rear convex portion 75k is located between them, and the seat 3 is positioned with respect to the support structure 7 in the width direction. Further, since the lower surface 75f of the seat body 75 can be hidden by the rear convex portion 75k, the appearance of the chair 1 when viewed from the rear side can be improved.

Further, as shown in FIGS. 9B and 10, a protruding block portion 75m capable of contacting the pivot 61 is formed on the lower surface 75f of the seat body 75. The protruding block portion 75m is a portion that comes into contact with the pivot 61 when the seated person is seated on the seat 3.

The protruding block portion 75m is located behind the pair of telescopic portions 75h, extends in the width direction between the telescopic portions 75h, and projects in a direction away from the lower surface 75f. When the seated person is not seated on the seat 3 in the state of the use position P1, the protruding block portion 75 m is separated from the pivot 61 and is not in contact with the protruding block portion 75 m, as shown in FIG. The pair of telescopic portions 75h is extended by the load when the seated person is seated on the seat 3, so that the protruding block portion 75m between the elastic portions 75h on the lower surface 75f of the seat body 75 moves downward. , Is in contact with the pivot 61.

The protruding block portion 75 m is composed of a recess having a semicircular cross section along the outer shape of the pivot 61, and when the seated person sits on the seat 3, the inner wall surface 75p of the recess abuts on the outer peripheral surface of the pivot 61 to expand and contract. The deflection of the portion 75h is restricted and the seat 3 is supported by the pivot 61. By making the inner wall surface 75p of the protruding block portion 75m a curved surface along the outer shape of the pivot 61, the contact area of the protruding block portion 75m with respect to the pivot 61 can be increased, and a load is applied to one place of the lower surface 75f of the seat body 75. Can be prevented from concentrating.

By ensuring the cushioning property of the seat 3 by the pair of telescopic portions 75h and restricting the telescopic portion 75h from extending more than necessary by the protruding block portion 75m, the left and right seat support members 65, particularly the seat, are subjected to the load of the seater. Due to the downward bending of the region near the center of the main body 75 in the width direction, it is possible to prevent the pair of left and right side wall portions 65f of the seat support member 65 from being deformed inward in the width direction.

The seat 3 described above is arranged at the use position P1 (see FIG. 1) with the seat surface 3a formed on the upper surface substantially horizontal. The seat 3 rotates about the axis C1 arranged in the rear portion along the width direction so as to move the front end portion upward from the use position P1. Since the reaction force adjusting mechanism 16 of the seat rotation mechanism 15 described above urges the seat 3 to rotate from the use position P1 to the flip-up position P2, the spring force causes the seat 3 to rise forward. It changes to the upright flip-up position P2 (see FIG. 2). Since the axis C1 which is the center of rotation is arranged at the rear of the seat 3 and the reaction force adjusting mechanism 16 is housed at the rear of the axis C1, the center of gravity of rotation can be placed behind the pivot 61. The seat 3 can be rotated with a small spring force.

At the use position P1 of the seat 3, rotation to the side opposite to the flip-up position P2 side is regulated by a stopper 62a (see FIG. 4) provided in the seat rotation mechanism 15. The stopper 62a regulates the downward rotation of the seat 3 so that when the seated person sits on the seat 3 at the use position P1, a moment opposite to the moment due to the seating load is generated. Further, the rotation of the seat 3 at the flip-up position P2 to the side opposite to the use position P1 side is also regulated by the stopper 62a.

<How to assemble a chair>
Next, a method of assembling the chair of the present embodiment will be described with reference to FIG.

In assembling the chair 1 of the present embodiment, first, the support structure 7 is assembled.
When assembling the support structure 7, first, as shown in FIG. 4, a predetermined distance in the axial direction is provided on one end side of the pivot 61 and on the right end side of the chair 1 when viewed from the seated person. A pair of bearing members 72 and a first gear 64 are attached. At this time, the pair of bearing members 72 are attached at predetermined intervals in the axial direction so as to be positioned corresponding to each bearing portion 65d of the right seat support member 65. Further, of the pair of bearing members 72, the first gear 64 is attached in the vicinity of the bearing member 72 on the inner side in the axial direction.

Subsequently, similarly, a pair of bearing members 72 and a first gear 64 are attached to the other end side of the pivot 61 at positions corresponding to the left seat support member 65.

Further, the spiral spring 66, the second gear 68, and the operated portion 67 are arranged in each internal space K2 of the pair of seat support members 65. At this time, one end side of the operated portion 67 is projected outward (inside in the width direction) from the insertion hole 65u formed in the side wall portion 65f which is inside in the width direction of the chair 1 in the seat support member 65.

Next, a pair of seat support members 65 in which the spiral spring 66 and the like are arranged in the internal space K2 are attached to the pivot 61 at predetermined intervals in the axial direction. For example, when the right seat support member 65 is attached, a pair of bearing members 72 attached to one end side in the axial direction of the pivot 61 are inserted into each of the pair of bearing portions 65d of the right seat support member 65. Install.
Subsequently, the left seat support member 65 is also attached to the pivot 61 in the same manner.

Next, the seat 3 is attached to the pivot 61 of the support structure 7 via a pair of seat rotation mechanisms 15. At this time, the pivot 61 is connected by arranging the seats 3 on the opening 65e side of each seat support member 65 so as to close the internal space K2 of the seat support member 65 in each seat rotation mechanism 15. The seat 3 is attached to the seat 3.

Next, the pivot support 62 is attached to both ends of the pivot 61 in the axial direction. At this time, the pivot support 62 is screwed to each of the pair of fixing plates 51 provided at both ends of the pivot 61.

Next, by connecting the leg bodies 2 to both ends of the pivot axis 61 via the pivot support members 62, the left and right leg bodies 2 are connected to each other to obtain the support structure 7.

Next, the backrest 4 separately assembled is attached to the support structure 7. At this time, the lower end portions 8a3 and 8b3 of the back frame main body 8a and the support frame 8b in the backrest support frame 8 are fastened to each of the front and rear fastening portions 38 and 39.

Next, the degree of urging of the seat 3 by the spiral spring 66 is adjusted by operating the operated portion 67 of each seat rotation mechanism 15. In this way, the chair 1 of the present embodiment is assembled.

Although the seat 3 is attached to the support structure 7 first, the assembly order of the support structure 7, the seat 3 and the backrest 4 can be changed as appropriate.

As described above, the chair 1 in the above embodiment is a chair capable of flipping the seat 3 from the use position P1 to the flip-up position by the urging force stored in the spiral spring 66, and the urging force of the spiral spring 66. It is possible to provide a chair in which the flip-up speed of the seat 3 can be easily adjusted. When adjusting the rotation speed of the seat 3, the operated portion 67 is displaced in the width direction of the chair 1 to release the meshing from the first position where the first gear 64 and the second gear 68 mesh with each other. The urging force of the spiral spring 66 can be adjusted by rotating the operated portion 67 about the axis and compressing the spiral spring 66 in the winding direction while moving to the second position. Further, after adjusting the urging force, the operated portion 67 is moved to the first position while maintaining the state, and the second gear 68 is meshed with the first gear 64 to urge the spiral spring 66. The rotation of the second gear 68 can be regulated against the above.

In the present embodiment, since the reaction force adjusting mechanism 16 is arranged by utilizing the internal space K2 of the seat support member 65, the appearance of the chair 1 can be improved. Further, in the internal space K2, by arranging the spiral spring 66 behind the pivot 61, these can be efficiently housed in the seat support member 65 without occupying the space in the thickness direction of the seat. ..

Further, each operated portion 67 in the pair of seat support members 65 arranged apart from each other in the width direction of the chair 1 projects inward in the width direction, and is formed between the pair of seat support members 65. It has a structure that exists in space. Therefore, it is possible to prevent each operated portion 67 from interfering with other parts constituting the chair 1, so that it is possible to prevent the operated portion 67 from being damaged and the like, and the seat 3 is flipped up. It is also possible to stack and store the chairs 1 together.

Next, another form of the reaction force adjusting mechanism will be described.
(Modification example 1)
FIG. 11A is a diagram showing the configuration of the reaction force adjusting mechanism of the first modification.
As another form of the reaction force adjusting mechanism, for example, as shown in FIG. 11A, a torsion coil spring may be adopted instead of the spiral spring 66. In the reaction force adjusting mechanism 90 shown in FIG. 11A, the torsion coil spring 91 is mounted on the operated portion 67, one end portion 91a thereof is inserted and held in the end holding hole 67c formed in the operated portion 67, and the other end portion thereof. The 91b is locked to the convex portion 65t of the seat support member 65 so as not to rotate relative to each other. At the second position, the operated portion 67 can be rotated in the winding direction of the coil spring 91 to generate storage force, and at the first position, the seat 3 is moved at a speed corresponding to the reaction force (urging force) of the torsion coil spring 91. It can be rotated.

(Modification 2)
FIG. 11B is a diagram showing the configuration of the reaction force adjusting mechanism of the modified example 2.
Further, as shown in FIG. 11B, a compression spring may be adopted. In the reaction force adjusting mechanism 91 shown in FIG. 11B, one end 94a of the compression spring 94 is connected to the convex engaging piece 67d provided on the outer peripheral surface of the operated portion 67, and the other end 94b is seated and supported. By connecting to the convex portion 65t of the member 65, the compression spring 94 is arranged in an upright state with respect to the lower wall portion 65j of the seat support member 65. In this configuration, in the second position, the operated portion 67 can be rotated so as to compress the compression spring 94 in the length direction, so that the stored force can be generated, and in the first position, the speed corresponding to the reaction force of the compression spring 94. The seat 3 can be rotated with.

(Modification 3)
FIG. 11C is a diagram showing the configuration of the reaction force adjusting mechanism of the modified example 3.
Further, as shown in FIG. 11C, a tension spring may be adopted. In the reaction force adjusting mechanism 92 shown in FIG. 11C, one end 95a of the tension spring 95 is connected to the engaging piece 67d of the operated portion 67, and the other end 95b is provided on the rear end side inner surface of the seat support member 65. By connecting to the engaged piece 65e, the chair 1 is attached so as to extend in the front-rear direction and float from the lower wall portion 65j of the seat support member 65. In this configuration, in the second position, the operated portion 67 can be rotated in the direction in which the tension spring 95 is extended, so that the seat 3 can be stored at a speed corresponding to the reaction force of the tension spring 95 in the first position. It can be rotated.

(Modification example 4)
FIG. 11D is a diagram showing the configuration of the reaction force adjusting mechanism of the modified example 4.
Further, as shown in FIG. 11D, the compression spring 94 and the tilt cam 96 may be combined. The reaction force adjusting mechanism 97 shown in FIG. 11D is configured by extrapolating a compression spring 94 and an inclined cam 96 to the operated portion 67. The inclined cam 96 is composed of a first cam 96a and a second cam 96b, and is arranged in parallel with the inclined cam surfaces 96a1 and 96b1 in contact with each other in the width direction. The first cam 96a is fixed to the end of the operated portion 67, and the inclined cam 96 rotates as the operated portion 67 rotates. On the other hand, the second cam 96b is a fixed cam, and the rotation restricting convex portion 96c formed on the outer surface of the first cam 96a engages with the locking groove 65v formed on the side wall portion 65f of the seat support member 65. By doing so, it is fixed to the seat support member 65.

In this configuration, when the operated portion 67 is rotated in the second position, the first cam 96a rotates along the inclined cam surface 96b1 of the second cam 96b, and the first cam 96a moves to the compression spring 94 side. Therefore, the compression spring 94 can be compressed and stored. In this way, the seat 3 can be rotated at a speed corresponding to the reaction force of the compression spring 94 at the first position.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

In the above embodiment, the operated portion 67 of the reaction force adjusting mechanism 16 projects toward the inside of the seat support member 65 in the width direction (the other seat support member 65 side), but the present invention is not limited to this. For example, the seat support member 65 may be configured to project outward from the lower wall portion 65j in the thickness direction of the seat 3.

Further, one end side of various springs used as the urging means may be projected to the outside of the seat support member 65 to function as the operated portion 67. As a result, the spring can be directly operated, so that it is easy to detect the state of livestock force. Moreover, since the number of parts can be reduced, the assembly time can be shortened and the cost can be reduced.

Further, the seat rotation mechanism 15 is not limited to the above-described configuration, and other urging means may be used.
For example, instead of the spiral spring 66, any one of a torsion coil spring, a compression spring, and a tension spring may be adopted, or a compression spring and an inclined cam may be combined.

Further, although the seat rotation mechanism 15 is provided for each of the pair of seat support members 65, the seat rotation mechanism 15 may be provided only for one of the seat support members 65.

1 ... chair, 2 ... leg body, 3 ... seat, 3a ... seat surface, 7 ... support structure, 15 ... seat rotation mechanism, 35 ... support member, 65f ... side wall portion, 61 ... pivot (connecting member), 64 ... 1st gear, 65 ... Seat support member, 67 ... Operated part, 68 ... 2nd gear, K1 ... Space, K2 ... Internal space, P1 ... Use position, P2 ... Flip-up position

Claims (5)

A support structure including a pair of legs separated in the width direction of the chair and a connecting member extending in the width direction and connecting the pair of legs in the width direction.
A seat that is rotatably supported with respect to the support structure,
A seat rotation mechanism for rotating the seat with respect to the support structure is provided.
The seat rotation mechanism is a seat support member that supports the seat and is pivotally supported by the connecting member and has an internal space in which the connecting member is arranged.
An urging means that is arranged behind the connecting member in the internal space of the seat supporting member and urges the seat to rotate upward around the axis of the connecting member.
A chair characterized in that at least a part of the urging means that protrudes to the outside of the seat support member is provided with an operated portion having a function of adjusting the urging force on the seat. The seat support members are arranged in pairs separated from each other in the width direction, and each of the operated portions of each seat support member faces each other in the width direction from each seat support member to the outside. Protruding downwards,
The chair according to claim 1. The seat support member has a pair of side wall portions that are separated in the width direction and form the internal space between the facing surfaces, and a part of the operated portion arranged in the internal space is a pair. Among the side wall portions, the side wall portion located inside the width direction protrudes inward in the width direction.
The chair according to claim 2. The seat rotation mechanism extends behind the connecting member in the axial direction of the connecting member and is connected to the operated portion to which a part of the urging means is connected.
The first gear attached to the connecting member and
A second gear that is attached to the operated portion and meshes with the first gear is further provided.
The operated portion is formed along the width direction between a first position in which the first gear and the second gear mesh with each other and a second position in which the first gear and the second gear are disengaged from each other. Displaceable,
At the second position, the urging force of the urging means can be adjusted.
The chair according to any one of claims 1 to 3. The operated portion is configured to rotate about an axis in the direction in which the urging force of the urging means is stored.
The chair according to claim 4.

Images