JP7161342B2 - Chair - Google Patents

Description

The present invention relates to chairs.

2. Description of the Related Art Conventionally, there is a chair described in Patent Document 1, for example, as a chair used in theaters, halls, and the like. This chair is intended for an unspecified number of users of different generations, and can firmly support the load when the user puts their hands on it so that the elderly can safely stand up. It has large armrests. The armrests, together with the legs that support the seat, are wall-like and stand up on both sides in the width direction of the chair.
On the other hand, by temporarily installing it in an empty space such as a theater or hall, or in a gymnasium or office, it is possible to create a seating space as needed, and the target space can be used for multi-purpose events. chairs are known (see, for example, Patent Documents 2 and 3).

Japanese Utility Model Laid-Open No. 4-115444 Japanese Patent No. 5432218 JP 2016-73550 A

As described in Patent Literature 1, when large standing walls including armrests and legs are provided on both sides in the width direction of the chair, the weight and size of the chair increase, and the workability of installing the chair deteriorates. Also, in the case of chairs such as those described in Patent Documents 2 and 3, which have high portability, assuming that the user grabs the front portion of the armrest from a seated position and stands up, sufficient support is provided for the load applied to the front portion of the armrest. It is necessary to consider securing strength. Furthermore, it is desirable that the member that supports the front part of the armrest does not hinder the movement of the lower legs of the seated person.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a chair that ensures ease of installation, secures the supporting strength of the armrests, and secures the freedom of movement of the lower limbs of the seated person.

As a means for solving the above problems, the present invention provides a seat having a seat surface, and a pair of left and right legs provided separately in the width direction of the chair, standing on the chair installation surface and supporting the seat, each of the left and right legs includes a front leg and a rear leg that are spaced apart from each other in the front-rear direction and extend in the vertical direction, and whose upper ends are arranged above the seat; and upper ends of the front legs and the rear legs. each of the connecting rods of the left and right legs constitutes a pair of left and right armrests, and at least one of the front legs and the rear legs extends diagonally forward and upward. A front upper extending portion is provided, and the connecting rod portion is supported by an upper end portion of the front upper extending portion.

According to this configuration, the seat that receives the seating load is supported by the front legs and the rear legs that are spaced apart in the front-rear direction of each of the left and right legs that are spaced apart in the left-right direction, so that the seat can be stably supported. In addition, the weight and size of the chair can be reduced as compared with the case where large standing wall-like legs and armrests are provided on both sides of the chair in the width direction. In addition, since the armrests are configured to include connecting rods that connect the upper ends of the front legs and the rear legs, the structure around the armrests can be simplified, and in this respect also weight and size can be reduced. Also, due to the reduction in weight and size, it is possible to ensure good installation workability of the chair.
A portion of at least one of the front legs and the rear legs that extends upward from the seat is formed as a front upper extension portion that extends obliquely forward and upward. is supported, the connecting rod portion and thus the armrest can be supported at a more forward position, and the supporting strength of the front portion of the armrest can be ensured.
In addition, since the lower part of the front upper extension part is positioned rearward, it is possible to suppress the influence on the range of movement of the thighs of the seated person while supporting the front part of the armrest with the front upper extension part. .
As described above, the chair of the present invention can secure the installation workability of the chair, secure the support strength of the front part of the armrest, and secure the freedom of movement of the lower limbs of the seated person.

In the present invention, the front legs include the front upper extension portion, the rear legs include the rear upper extension portion that extends obliquely rearward and upward behind the front upper extension portion, and the front upper extension portion is provided. The connecting rod portion may be supported by the upper end portion of each of the extending portion and the rearwardly upward extending portion.
According to this configuration, each of the front legs and the rear legs extends above the seat to form the front upper extension and the rear upper extension, and the upper ends of the front upper extension and the rear upper extension. Since the front and rear portions of the connecting rod portion are supported by the portion, the connecting rod portion and thus the armrest can be supported in a well-balanced manner against the load in the vertical direction, and the supporting strength of the entire armrest can be favorably secured.

In the present invention, each of the left and right legs includes a seat support that supports the seat, the seat support is arranged between the front legs and the rear legs, has a front end supported by the front legs, and is supported by the front legs. A configuration in which the ends are supported by the rear legs may be used.
According to this configuration, the seat support portion is arranged between the front legs and the rear legs and supported by the front legs and the rear legs, so that the support strength of the seat can be easily ensured, and the peripheral structure can be improved. It is possible to reduce the size and weight. In addition, since the seat support does not protrude forward or backward beyond the front and rear legs, the chances of the protruding parts of the chair coming into contact with the user's body are reduced. It is possible to suppress the influence on the degree of freedom of movement of the body.

In the present invention, the seat is rotatable between a use position in which the seat surface faces upward and a flip-up position in which a front end portion is moved upward with respect to the use position. may be provided with an urging mechanism that urges the seat in a direction to rotate from the use position to the flip-up position, and the urging mechanism may be supported by the seat support portion.
According to this configuration, the front legs and the rear legs can stably support the load due to the operation of the pivotal (flip-up) seat, the urging reaction force received from the urging mechanism, and the like. For this reason, it is possible to easily ensure the stability of the seat movement, and to reduce the size and weight of the peripheral structure.

In the present invention, each of the front legs and the rear legs has a rectangular cross section and extends from the chair installation surface to the connecting rod, and one of the front legs and the rear legs extends from the chair installation surface to the connection rod. The longitudinal direction along the long side of the rectangular shape in the cross section extends parallel to the width direction until reaching the rod portion, and the other of the front leg and the rear leg extends from the chair installation surface to the connecting rod portion , a twisted portion that twists the direction of the cross section by 90°, and the upper part of the leg closer to the connecting rod portion than the twisted portion of the other of the front leg and the rear leg extends in the longitudinal direction along the long side of the rectangular shape in the cross section. is parallel to the width direction and extends in the same position in the width direction as one of the front legs and the rear legs, and the lower leg portion of the other of the front legs and the rear legs on the side of the chair installation surface from the twisted portion is , The short side direction along the rectangular short side in the cross section may be parallel to the width direction, and may be displaced and extended inward in the width direction from the upper part of the leg.

According to this configuration, since each of the front legs and the rear legs has a rectangular cross section and extends from the chair installation surface to the connecting rod, it is easy to secure a contact area with respect to the chair installation surface, and the width of the connecting rod is can be easily secured, and can contribute to improving the stability of the chair installation and the stability of the armrests.
In particular, one of the front legs and the rear legs has the longitudinal direction of the cross section oriented in the width direction across the upper and lower ends, so it is easier to secure the ground contact area with respect to the chair installation surface, and the width of the connecting rod is also secured. easier to do. In the other of the front legs and the rear legs, the longitudinal direction of the cross section is oriented in the width direction on the connecting rod portion side of the twisted portion, while the short direction of the cross section is oriented in the width direction on the chair installation surface side of the twisted portion. and offset widthwise inward at the twist. As a result, when a plurality of chairs are approached in the front-rear direction, the other of the front legs and the rear legs on the side of the chair mounting surface can be inserted between the left and right leg rods of one of the front legs and the rear legs. Therefore, the chairs can be stacked in a nested manner in the front-rear direction, and a plurality of chairs can be efficiently stored in a trolley or warehouse.

In the present invention, the connecting rod portion may have a triangular cross section and extend in the front-rear direction.
According to this configuration, when the connecting rod is gripped when the chair is installed and put away, it becomes easier to hold the connecting rod, and the workability of installing the chair can be further improved.

ADVANTAGE OF THE INVENTION According to this invention, the chair which can ensure the installation workability of a chair, the support strength of an armrest, and the freedom of movement of a seated person's leg can be provided.

It is the perspective view which looked at the chair in 1st embodiment of this invention from the front outside. It is the perspective view which looked at the said chair from the back outside. FIG. 2 is a perspective view corresponding to FIG. 1 with the seat of the chair flipped up; It is the side view which looked at the state of FIG. 3 from the left side. It is a front view of the state in which multiple said chairs were arranged in the width direction. It is a top view in the state where a pair of the said chairs were arranged in the width direction. It is a side view of the state which piled up multiple said chairs in the front-back direction. FIG. 4 is a side view of a state in which the chairs are arranged with an interval therebetween in the front-rear direction; Fig. 2 is a perspective view showing the back frame of the chair, as well as the right leg, pivoting mechanism and biasing mechanism; FIG. 10 is an exploded perspective view of FIG. 9; It is the perspective view which looked at the leg of the right side of the said chair from the back outside. FIG. 12 is a cross-sectional view taken along the line AA of FIG. 11; It is a side view corresponded to FIG. 4 which shows the chair of a modification. It is a perspective view of a state in which a plurality of chairs in the second embodiment of the present invention are arranged in the width direction. FIG. 15 is a front view of FIG. 14; FIG. 15 is a plan view of FIG. 14; It is a left side view of the state where the chair of the second embodiment was installed on the stepped floor.

<First embodiment>
An embodiment of the present invention will be described below with reference to the drawings. With reference to FIG. 8, in the following description, unless otherwise specified, the directions such as front, back, up, down, left, and right are assumed to be seated in a normal posture on the chair 1 installed on a horizontal floor surface (chair installation surface) F. The front side of the seated person M1 is defined as "front", and the opposite side is defined as "rear". When the seated person M1 is seated in a normal posture, the seat 3 of the chair 1 is at the use position P1, which will be described later. In the drawings, an arrow UP indicates upward, an arrow FR indicates forward, and an arrow LH indicates leftward.

<Whole chair>
As shown in FIGS. 1 to 4, the chair 1 of the present embodiment has a seat 3 that forms a seat surface 3a, and a use position (sitting position, see the figure) P1 in which the seat surface 3a is directed upward, and a use position P1. This is a flip-up type chair 1 that can rotate between a flip-up position (storage position, see the figure) P2 where the front end is moved upward with respect to P1.

A chair 1 includes a pair of left and right legs 2 spaced apart in the left-right direction (the width direction of the chair 1), a seat 3 placed between the left and right legs 2, and the seat 3 and the left and right legs 2. A turning mechanism 15 arranged between, a backrest 4 arranged between the left and right legs 2 behind the seat 3, and a pair of left and right armrests 5 arranged above the left and right sides of the seat 3 , is equipped with

<Leg>
1 to 4, each of the left and right legs 2 includes a front leg 20 and a rear leg 25 (hereinafter referred to as the front and rear legs 20 and 25) that are separated from each other in the front-rear direction (the depth direction of the chair 1) and extend in the vertical direction. ) is provided. The upper ends of the front and rear legs 20 and 25 are connected via a connecting rod portion 30 extending substantially horizontally in the front-rear direction. Specifically, the connecting rod portion 30 is slanted rearwardly and downwardly, and extends in the front-rear direction in a curved shape that protrudes upward when viewed from the side. The left and right connecting rod portions 30 are members that respectively support the left and right armrests 5 (members constituting the left and right armrests 5 in this embodiment).

The upper and lower intermediate portions of the front and rear legs 20 and 25 are connected via a plate-shaped support member 35 perpendicular to the width direction. The term "intermediate" as used in the present application includes not only the center between both ends of the target component, but also the inner portion between both ends. When the chair 1 stands on the chair installation surface F, the longitudinal direction of the chair 1 becomes the depth direction of the chair 1. - 特許庁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 are members that support the left and right sides of the seat 3 and the left and right sides of the backrest 4, respectively. The left and right support members 35 are positioned behind the front end of the seat 3 (see front end position P3 in FIG. 4), and rotatably support the seat 3 so that the front end of the seat 3 can be flipped up. there is The left and right support members 35 are positioned forward of the rear end of the seat 3 (see rear end position P4 in FIG. 4). The left and right support members 35 (and the rotation center axis C1 of the seat 3) are positioned rearward of 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 of the seat 3 at the usage position P1.

The front and rear legs 20 and 25 extend vertically away from each other in the front-rear direction from the upper end reaching the connecting rod portion 30 to the lower end reaching the chair installation surface F (that is, over the upper and lower ends). The front and rear legs 20 and 25 constitute leg rods each having a rectangular (rectangular) cross section perpendicular to the length direction. Upper parts of the front and rear legs 20 and 25 extend above the seat 3 . A connecting rod portion 30 connecting the upper ends of the front and rear legs 20 and 25 is positioned at the height of the left and right armrests 5 .

For example, the connecting rod portion 30 is integrally formed with parts of the front and rear legs 20 and 25 in the vicinity of the connecting rod portion 30 by aluminum die casting or the like. The remaining portions of the front and rear legs 20 and 25 are formed by bending square steel pipes, for example. In the leg 2, the molded portion 2A including the connecting rod portion 30 and the remaining rod-shaped portions (steel pipe portions) 2B and 2C of the front and rear legs 20 and 25 are integrally connected at the front and rear joint portions 6 and 7, respectively. there is

Specifically, the upper end portion of the steel pipe portion 2B of the front leg 20 and the lower end portion of the front hanging portion 31 of the molded portion 2A are joined to each other at the front joint portion 6 . The upper end portion of the steel pipe portion 2C of the rear leg 25 and the lower end portion of the rear hanging portion 32 of the molded portion 2A are joined to each other at the rear joint portion 7 . The front hanging portion 31 is shorter in the vertical direction than the rear hanging portion 32 , and therefore the front joint portion 6 is positioned above the rear joint portion 7 . The front and rear coupling portions 6 and 7 are coupling structure portions using spigot fittings including key-shaped projections and retaining bolts.

A vertical intermediate portion (a lower inclined portion 23b described later) of the steel pipe portion 2B of the front leg 20 and an 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.
10 and 11, the support member 35 has a plate shape orthogonal to the width direction, and is arranged within the full width of the front leg 20 in the left-right direction (arranged so as to overlap the front leg 20 when viewed in the front-rear direction). and a rear wall portion 37 standing inward in the width direction from the rear edge portion of the side wall portion 36 . The front edge portion of the side wall portion 36 is joined to the rear surface side of the upper and lower middle portion of the front leg 20 by welding or the like. The inner edge portion of the rear wall portion 37 is joined to the front edge portion of the upper and lower intermediate portions of the rear leg 25 by welding or the like.

The support member 35 also functions as a connecting member that connects the upper and lower intermediate portions of the front and rear legs 20 and 25 . The support member 35 has a front end coupled to and supported by the front legs 20 and a rear end coupled to and supported by the rear legs 25 . That is, the support member 35 is supported by the front and rear legs 20 and 25 at both ends. The support member 35 has a rear wall portion 37 standing upright inward in the width direction, so that the front and rear legs 20 and 25 are connected to each other even if the rear leg 25 is offset inward in the width direction below the top bent portion 28c described later. It is possible.

1 to 4, the front and rear legs 20, 25 are rod-shaped and separated from each other in the front-rear direction at least below the support member 35 and the seat 3. As shown in FIG. For example, the front and rear legs 20 and 25 may be partially integrated in the front-rear direction at a height overlapping the support member 35 and at a height higher than that, or the front-rear positions may be interchanged (i.e., they may cross each other in an X shape when viewed from the side). or).

Lower end portions (grounding end portions) 21 and 26 of the front and rear legs 20 and 25 are in contact with and supported by the chair installation surface F, respectively. The lower end portion 21 of the front leg 20 is positioned forward of the lower end portion 26 of the rear leg 25 and is positioned rearward of the front end position P3 (see FIG. 4) of the seat 3 at the usage position P1. The front legs 20 are arranged entirely behind the front end position P3. The lower ends 21 of the front legs 20 are provided with forward extensions 21a that extend forward along the chair installation surface F in order to provide a grounding position as far forward as possible. The front extending portion 21a constitutes an extended ground contact portion 2D that extends in the front-rear direction of the leg 2 toward the side away from the support member 35. As shown in FIG.

The front leg 20 has a front leg vertical rod portion 23 extending vertically upward from a base end (rear end) 21b of the front extension portion 21a. A portion of the front leg 20 including the forward extending portion 21a and the front leg vertical rod portion 23 is formed in an L shape when viewed from the side. Since the portion reaching the lower end portion 21 of the front leg 20 is the front leg vertical rod portion 23, the area in the vicinity of the chair installation surface F occupied by the front leg 20 in plan view is narrow. As a result, as shown in FIG. 8, the front legs 20 are retracted from the areas where the lower legs of the seated person M1 and the pedestrian M2 move, making it easier for the seated person M1 and the pedestrian M2 to move their lower legs.

Referring to FIG. 4 , the rear leg 25 extends linearly downward and rearward from the upper and lower intermediate portions where the support members 35 are coupled, with an inclination when viewed from the side. A lower end portion 26 of the rear leg 25 is arranged in a region behind a rear end position P4 of the seat 3 at the usage position P1. A lower 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 tilting backward. 1 to 3, portions of the left and right rear legs 25 extending downward and rearward are offset inward in the width direction with respect to the left and right front legs 20. As shown in FIG.

Due to the offset, when a plurality of chairs 1 are arranged in the longitudinal direction as shown in FIG. 7, the left and right rear legs 25 of the front chair 1 can enter between the left and right front legs 20 of the rear chair 1. It is possible. That is, between the left and right front legs 20, there is formed a leg accommodation section capable of accommodating the left and right rear legs 25 of the other chair 1 positioned on the front side. Thus, when a plurality of chairs 1 are arranged in the longitudinal direction, the left and right rear legs 25 of the other chair 1 positioned on the front side can be inserted between the left and right front legs 20 (stacked in a nested manner). Therefore, it is possible to store a plurality of chairs 1 compactly by narrowing the pitches between them.
The front and rear legs 20, 25 will be further detailed later.

<Seat>
1 and 3, the seat 3 is rotatably supported by a support member 35 of the left and right legs 2 via a rotation mechanism 15. As shown in FIG. The seat 3 has a thick plate shape that is rectangular in plan view. The seat 3 is arranged at a use position P1 (see FIG. 1) in which the thickness direction is oriented in the vertical direction, with the seat surface 3a formed on the upper surface being substantially horizontal. The seat 3 rotates about an axis C1 along the width direction arranged at its rear portion so as to move the front end portion upward from the use position P1. As a result, the seat 3 changes to a raised forward position P2 (see FIG. 3). The rotating mechanism 15 includes a biasing mechanism 16 (see FIG. 9) that biases the seat 3 in a direction to rotate it from the use position P1 to the flip-up position P2. The biasing mechanism 16 is supported by the supporting member 35 of the leg 2 together with the rotating mechanism 15 .

Referring to FIG. 6, the rear end portion 3d of the seat 3 has a curved shape that protrudes rearward in a top view (a plan view of the seat surface 3a) in the use position P1. A rear end portion 3d of the seat 3 is formed along the curved shape of the lower portion of the backrest 4 in plan view. At the usage position P1 of the seat 3, the rotation of the seat 3 to the side opposite to the flip-up position P2 is restricted by a stopper 62a (see FIG. 10) provided in the rotation mechanism 15. As shown in FIG. The stopper 62a restricts the rotation of the seat 3 so that when the seated person M1 is seated on the seat 3 at the use position P1, a moment due to the seating load is generated in a direction opposite to the moment.

Rotation of the seat 3 in the flip-up position P2 to the side opposite to the usage position P1 is also restricted by the stopper 62a. The chair 1 can be folded backward with the seat 3 flipped up, and can be stored (stacked) by stacking a plurality of chairs in a state in which the depth direction is oriented in the vertical direction. This corresponds to the state in which the right side of FIG. 7 is directed upward. When a plurality of chairs 1 are vertically stacked flat, the weight of the chairs 1 stacked above is added to the chair 1 at the flip-up position P2. The stopper 62a restricts the rotation of the seat 3 so that the moment caused by the weight acts in the opposite direction.

<Rotating Mechanism>
As shown in FIGS. 9 and 10 , the rotating mechanism 15 includes a rotating support 62 , a pivot 61 and a seat frame 65 . 9 and 10 show the rotation mechanism 15 and the like on the right side of the chair 1. Hereinafter, description will be made with reference to the right side configuration shown in FIGS. 9 and 10, and the left side configuration is left-right symmetrical. The explanation is omitted.

The rotary support 62 is fixed to the inner surface of the side wall portion 36 of the support member 35 using bolts or the like. The rotary support 62 is formed in a cylindrical shape with a bottom centered on the axis C1, and is arranged so as to open inward in the width direction. The rotary support 62 is configured to rotatably support the seat 3 together with the support member 35 .

The pivot 61 extends linearly along the width direction with the axis C1 as its center. In this embodiment, the end of the pivot 61 is fixedly supported by the pivot support 62 . The pivot 61 also functions as a connecting member that connects the left and right legs 2 together.

A first gear 64 having a semicircular shape when viewed in the axial direction is fixed to a portion of the pivot 61 located on the inner side in the width direction of the rotation support 62 . The first gear 64 has a gear portion centered on the axis C1 on its semicircular outer peripheral portion.

The seat frame 65 is arranged on the inner side in the width direction of the rotary support 62 . The seat frame 65 includes a seat frame pivotal support portion 65a that is rotatably engaged with the pivot support 62 from the inner side in the width direction, an urging mechanism housing portion 65c that is adjacent to the inner side in the width direction of the seat frame pivotal support portion 65a, and an attachment mechanism. and a frame extending portion 65b extending forward from the force mechanism accommodating portion 65c.

The seat frame pivotal support portion 65a is, for example, a protrusion formed by partially cutting the top and bottom of the cylindrical wall centered on the axis C1, and is rotatably supported on the inner peripheral side of the rotation support 62. As shown in FIG. A stopper 62a is provided on the inner peripheral side of the rotary support 62 and engages with the seat frame pivotal support portion 65a in the circumferential direction at each of the use position P1 and the flip-up position P2 of the seat 3 . The rotation of the seat 3 is restricted between the use position P1 and the flip-up position P2 by the stopper 62a, and the rotation of the seat 3 is restricted between the use position P1 and the flip-up position P2.

The biasing mechanism accommodating portion 65c has a container shape that opens upward. The biasing mechanism accommodating portion 65c has a U-shaped notch portion 65d that avoids the pivot 61 at a portion that intersects the pivot 61. As shown in FIG. The biasing mechanism 16 is housed in the biasing mechanism housing portion 65c.

The frame extending portion 65b extends forward with a V-shaped cross section that opens upward.
For example, the upward opening of the seat frame 65 is closed by the bottom plate (not shown) of the seat 3 . A cushion material 3b is attached to the bottom plate, and the periphery of the cushion material 3b is covered with a skin material 3c. The seat 3 includes a seat frame 65, a bottom plate, a cushion material 3b and a skin material 3c.

<Forcing Mechanism>
The biasing mechanism 16 includes a spiral spring (biasing member) 66 , a shaft member 67 , a second gear 68 , and a first gear 64 attached to the pivot 61 .
The spiral spring 66 is configured in a spiral shape around a shaft member 67 along the width direction. A radial inner end portion of the spiral spring 66 is locked to the shaft member 67 so as not to rotate relative to the shaft member 67 . A radially outer end portion of the spiral spring 66 is locked to a wall portion of the urging mechanism accommodating portion 65c so as to be relatively unrotatable.

The shaft member 67 is rotatably supported by the wall of the biasing mechanism accommodating portion 65c.
The second gear 68 is arranged on the inner side in the width direction of the spiral spring 66 and is supported by the shaft member 67 so as to be able to rotate integrally therewith. The second gear 68 forms a gear portion on its outer periphery. The gear portion of the second gear 68 meshes with the gear portion of the first gear 64 .

In such a configuration, when the second gear 68 rotates due to the spring force accumulated in the spiral spring 66, the second gear 68 rolls on the outer circumference of the first gear 64 and rotates the seat 3 in the flip-up direction. The spiral spring 66 is given an initial spring force capable of urging the seat 3 in the flip-up direction even when the seat 3 is at the flip-up position P2. The spiral spring 66 further accumulates the spring force when the seat 3 is lowered to the use position P1, and rotates the seat 3 to the flip-up position P2 when the seated person M1 is absent.

<Reclining back>
1 to 4 and 8, the backrest 4 stands rearwardly upward behind the seat 3 and supports the back of the seated person M1 from behind. The backrest 4 has a curved shape in which the lower portion is convex backward in a plan view. The curved shape of the lower part of the backrest 4 is formed so as to follow the curve of the waist of the seated person M1, thereby enhancing the supportability of the waist of the seated person M1. The lower portion of the backrest 4 is fixed to and supported by the support members 35 of the left and right legs 2 .

The backrest 4 forms a backrest surface 4a by stretching a mesh-like upholstery material 9 on a back frame 8 shown in FIGS.
9 and 10, the back frame 8 includes a U-shaped back frame body 8a that opens downward when viewed in the front-rear direction, and a pair of right and left sides that support the lower parts of the left and right sides of the back frame body 8a from below and behind. A support frame 8b and a connecting frame 8c extending between the lower rear 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, for example, by bending a circular steel pipe.

The back frame main body 8a is erected along the backward inclination angle of the backrest 4. - 特許庁
Each of the left and right support frames 8b has an upper inclined portion along the side edge of the back frame main body 8a and a lower inclined portion extending downward and rearward from the lower end of the upper inclined portion through a bent portion. The upper inclined portion is joined to the side edge of the back frame main body 8a by welding or the like.

The connecting frame 8c is formed in a U-shape opening forward in a plan view so as to have an inclined posture that is tilted backward from the back frame main body 8a. The left and right front end portions of the connecting frame 8c are joined by welding or the like to the lower rear end portions of the lower inclined portions of the left and right support frames 8b.
The connecting frame 8c is curved along the curved shape of the lower end portion of the backrest 4 in plan view. The connecting frame 8c also functions as a connecting member that connects the left and right legs 2 to each other.

Front lower fastening plates 8a1 for front lower fastening portions 38 provided on the front sides of the support members 35 of the left and right legs 2 are fixed to the left and right lower end portions of the back frame main body 8a by welding or the like. The left and right front lower fastening plates 8a1 are fastened and fixed to corresponding front lower fastening portions 38 by bolts 8a2 that are obliquely screwed from the front upper side.

Rear lower fastening plates 8b1 for rear lower fastening portions 39 provided on the support members 35 of the left and right legs 2 are fixed to the lower rear ends of the left and right support frames 8b by welding or the like. The left and right rear lower fastening plates 8b1 are fastened and fixed to the corresponding rear lower fastening portions 39 by bolts 8b2 that are screwed obliquely from the rear upper side.

<Armrest>
1 to 4, the left and right armrests 5 are configured by left and right connecting rod portions 30, for example. The upper surface of the left and right connecting rod portion 30 forms an elbow rest surface 5a on which the forearm of the seated person M1 is placed. The left and right armrests 5 (the left and right connecting rod portions 30) are arranged separately above the support members 35 on the same side. Since a space is formed below the left and right armrests 5 (the left and right connecting rod portions 30), the operator can easily grip the armrests 5 when carrying the chair 1 or the like. Also, the weight of the leg 2 can be reduced.

The front portions of the left and right armrests 5 (and the front upper portions of the front upper extending portions 24 of the left and right front legs 20) protrude forward from the seat 3 at the flip-up position P2 (see FIG. 4). Therefore, when a pedestrian loses balance, the left and right armrests 5 can be easily grasped, and the left and right armrests 5 can be easily held when carrying the chair 1 (the seat 3 at the flip-up position P2 is unlikely to be an obstacle). . The left and right armrests 5 may include pad members or the like attached to the left and right connecting rod portions 30 . The molded portion 2A including the left-right connecting rod portion 30 is not limited to a metallic material such as an aluminum alloy, and may be made of a synthetic resin material.

<Stacking>
Referring to FIG. 7, a plurality of chairs 1 of the present embodiment can be stacked in a nested manner in the depth direction (the front-rear direction in FIG. 7) with the seat 3 at the flip-up position P2. When a plurality of chairs 1 are vertically stacked, the seat 3 at the flip-up position P2 of the lower chair 1 receives the weight of the chairs 1 stacked upward on the lower surface opposite to the seat surface 3a.

3 and 5, an undercover 11 is attached to the lower surface of the seat 3. As shown in FIG. When the chairs 1 with the seat 3 flipped up are piled up in the depth direction, the under cover 11 is aligned with the rear lower end portion (the portion along the connecting frame 8c) of the backrest 4 of the chair 1 located on the front side in the depth direction. A recess 11a is formed. This defines the interval between a plurality of chairs 1 overlapping in the depth direction. When a plurality of chairs 1 are vertically stacked, the rear lower end of the backrest 4 of the upper chair 1 is aligned and supported by the concave portion 11a of the seat 3 of the lower chair 1, so that the chairs 1 are stacked. positional deviation is suppressed. For convenience of illustration, the undercover 11 may differ between drawings.

When the chairs 1 with the seat 3 flipped up are piled up in the depth direction, the rear end 21b of the front leg 20 (forward extension 21a) of the front leg 20 of the chair 1 on the front side in the depth direction has a rear end 21b on the back side in the depth direction. The front end portion 21c of the lower end portion 21 (forward extension portion 21a) of the front leg 20 of the chair 1 abuts from the back side in the depth direction. Also, the front end of the connecting rod portion 30 of the chair 1 on the far side in the depth direction contacts the rear end portion of the connecting rod portion 30 of the chair 1 on the near side in the depth direction from the far side in the depth direction. These abutments, together with the alignment of the rear lower end of the backrest 4 with the recess 11 a of the undercover 11 , contribute to stably stacking the chairs 1 . Thereby, a plurality of chairs 1 can be stably stacked and stored at equal intervals.

By stacking a plurality of chairs 1 in the vertical direction on a dedicated cart (not shown), a plurality of chairs 1 can be transported by the cart and stored in a specified location.
The chair 1 can also be housed in a specified place (nesting) in a state in which a plurality of chairs 1 are nested in the front-rear direction on the chair installation surface F while standing on the chair installation surface F.

<Installation of chairs>
As shown in FIGS. 5 and 6, a connecting mechanism 17 is provided on the widthwise outer side of the left and right support members 35 so as to connect the chairs 1 arranged in the widthwise direction. The connecting mechanism 17 includes a first member 18 provided on one side in the width direction (right side in the drawing) and a second member 19 provided on the other side in the width direction (left side in the drawing). The first member 18 includes a truncated cone-shaped first base portion 18a whose axial direction is oriented in the width direction, and a convex portion 18b that protrudes outward in the width direction from the center of the outer portion of the first base portion 18a. . The second member 19 includes a truncated cone-shaped second base portion 19a whose axial direction is oriented in the width direction, and a recessed portion 19b provided in the center of the outer portion of the second base portion 19a. The first member 18 and the second member 19 have their axial centers arranged, for example, on the axis C1 (see FIGS. 3 and 4).

The convex portion 18b has a columnar shape that is inclined upward in the width direction so as to be positioned higher on the outer side in the width direction, for example. The concave portion 19b corresponds to the convex portion 18b, and is a bottomed hole having a circular cross section that is inclined so that the bottom side is located upward. The convex portion 18b is inclined with respect to the chair installation surface F of the chair 1 and is inserted into the concave portion 19b of the other chair 1 adjacent thereto. By tilting the chair 1 back after the projection 18b is inserted, the upwardly inclined projection 18b engages the recess 19b in a hook-like manner to restrict disengagement by horizontal movement. Each of the first member 18 and the second member 19 is integrally formed of a synthetic resin material such as polyacetal.

A plurality of chairs 1 according to the present embodiment can be installed side by side in front, back, left, and right in, for example, a theater, an empty space in a hall, a gymnasium, etc., to temporarily increase the seating space. At this time, the chairs 1 adjacent to each other in the left-right direction are installed at a specified position on the chair installation surface F while being connected by the connection mechanism 17 .

The left and right legs 2 of the chairs 1 can contact the outer surfaces 41 with the legs 2 of the adjacent chairs 1 when a plurality of chairs 1 are arranged adjacent to each other in the left-right direction. Also referring to FIG. 11 , the outer surface 41 of the leg 2 extends from a specific upper portion of the front leg 20, the connecting rod portion 30 and the rear leg 25 (a portion above a top bending portion 28c described later (upper inclined portion 28d)). ) are formed by respective outer surfaces 41a, 41b, 41c. Upper parts of the front legs 20, the connecting rods 30 and the rear legs 25 are arranged on the outermost side of the chair 1 in the width direction. The outer surface 41 of the leg 2 is a plane orthogonal to the width direction, and constitutes the outermost surface of the chair 1 in the width direction.

By bringing the outer surfaces 41 of the legs 2 of the adjacent chairs 1 into contact with each other, the upper portions of the front legs 20, the connecting rods 30 and the rear legs 25 of the two chairs 1 having square cross sections are arranged without any gap in the width direction. Contact is possible.
Therefore, when a plurality of chairs 1 are arranged side by side, there is no space between the front legs 20 of adjacent chairs 1.例文帳に追加In particular, there is no space between the forward extensions 21a of the front legs 20 on the floor surface F. Foreign matter such as dirt and dust tends to accumulate between the adjacent front legs 20 when the gap is generated, but in the chair 1 of the present embodiment, foreign matter is less likely to accumulate between the adjacent front legs 20 .

In addition, since the front legs 20 have a rectangular cross section and the outer side surfaces 41a perpendicular to the width direction are brought into contact with each other, there is less gap between the front legs 20 of the adjacent chairs 1 than when the front legs 20 have a circular cross section. does not occur. In particular, when the forward extending portions 21a of the front legs 20 are arranged side by side, the lateral surfaces 41a1 of the forward extending portions 21a having a rectangular cross section abut against each other, so that no valley is formed on the upper surface side of the adjacent forward extending portions 21a. . Therefore, it is possible to prevent foreign substances from accumulating in the valleys between the adjacent forward extending portions 21a and from entering a part of the shoe (especially a pin heel of women's shoes).

<Details of front and rear legs>
Next, the front and rear legs 20, 25 will be further detailed.
1 to 4, the front leg 20 has an L-shaped lower portion when viewed from the side, and a V-shaped upper portion which protrudes rearward when viewed from the side. The upper portion of the front leg 20 is connected to the front leg vertical rod portion 23 via a mid-stage bent portion 23a that protrudes forward. An upper inclined portion 23d which is connected to the rear through a convex top bent portion 23c and which is inclined so as to be located forward as the upper side is located. The top bent portion 23c is located above the seat surface 3a of the seat 3 at the use position P1.

A front leg upper bent portion 23e is configured including the vertically inclined portions 23b, 23d and the top bent portion 23c. By providing the front leg upper bent portions 23e, when the thighs of the seated person M1 face outward in the width direction, the thighs are less likely to interfere with the front legs 20 (see FIG. 8). The front coupling portion 6 is provided on the upper inclined portion 23d (see FIG. 2). The upper inclined portion 23 d (including the front hanging portion 31 ) of the front leg 20 constitutes a front upper extension portion 24 above the seat 3 and obliquely extending forward and upward in a side view. A front upper end portion of the front upper extending portion 24 is connected to a front end portion of the connecting rod portion 30 via a front end bent portion 33 .

The front leg 20 has a rectangular cross section and extends from the chair installation surface F to the connecting rod portion 30 . The front leg 20 extends from the chair installation surface F to the connecting rod portion 30 with the longitudinal direction of the rectangular cross-section facing the width direction (parallel to the width direction in the embodiment).

The lower end portion 21 of the front leg 20 is provided with a forward extension portion 21a that continues to the lower end portion of the front leg vertical rod portion 23 via a front lower bent portion 21d. The forward extending portion 21a extends forward along the chair installation surface F and the front-rear direction. A front leg cover 22 made of, for example, synthetic resin or non-woven fabric is attached to the front extending portion 21a. The front leg cover 22 includes a front end covering portion 22a that covers the front end portion (tip portion) 21c of the forward extending portion 21a from the front, a lower surface covering portion 22b that covers the lower surface of the forward extending portion 21a, and a rear cover portion 22b that covers the lower surface of the forward extending portion 21a. and a rear end covering portion 22c that covers the end portion 21b (the outer peripheral portion of the front lower bent portion 21d). A groove-shaped (concave) or bead-shaped (convex) non-slip pattern is formed on the lower surface (grounding surface) of the lower surface covering portion 22b.

1 to 4, the rear leg 25 has the rod-shaped portion 2C that extends downward and rearward in a straight line from the rear position of the top bent portion 23c of the front leg 20 in a side view.
The upper portion of the rear leg 25 above the rod-shaped portion 2C is formed in a V shape that protrudes forward when viewed from the side. The upper portion of the rear leg 25 is linearly connected to the upper portion of the rod-shaped portion 2C, which is the lower portion. An upper inclined portion 28d that is continuous via the bent portion 28c and inclined so that the upper side is located on the rear side. The top bent portion 28c is located above the seat surface 3a of the seat 3 at the use position P1.

A rear leg upper bent portion 28e is configured including the vertically inclined portions 28b, 28d and the top bent portion 28c. The upper inclined portion 28d of the rear leg 25 constitutes a rear upper extending portion 29 that extends obliquely upward and rearward in a side view above the seat 3. As shown in FIG. A rear upper end portion of the rear upper extension portion 29 continues to a rear end portion of the connecting rod portion 30 via a rear end bent portion 34 . The front lower end portion of the rear upper extending portion 29 continues to the front upper end portion of the rod-shaped portion 2C (hereinafter sometimes referred to as the rear lower extending portion 29a) via the top bent portion 28c.

The lower inclined portion 28b is arranged linearly or parallel to the upper inclined portion 23d of the front leg 20 in a side view. The upper inclined portion 28d is arranged linearly or parallel to the lower inclined portion 23b of the front leg 20 in a side view. The front legs 20 and the rear legs 25 have an appearance as if they intersect in an X shape when viewed from the side.

The rear leg 25 has a rectangular cross section and extends from the chair installation surface F to the connecting rod portion 30 . The rear leg 25 has a rectangular cross-sectional shape whose orientation in the longitudinal direction is changed on the way from the chair installation surface F to the connecting rod portion 30 . The rear leg 25 has its cross-sectional shape twisted by 90° at the top bent portion 28c. That is, the top bent portion 28c bends the rear leg 25 in a side view while twisting the direction of the cross-sectional shape of the rear leg 25 .

In the rear leg 25, the upper inclined portion 28d has a rectangular cross-sectional shape with the longitudinal direction facing the width direction, whereas the lower inclined portion 28b has a rectangular cross-sectional shape with the short side direction facing the width direction. ing. The outer side surface 41b of the upper inclined portion 28d, which is outside in the width direction and perpendicular to the width direction, is twisted forward by 90° at the top bent portion 28c, and is oriented forward and downward in the lower inclined portion 28b and parallel to the width direction. It changes to a front downward slope. The rear lower slope surface of the upper slope portion 28d facing the rear lower direction and parallel to the width direction is twisted by 90° toward the width direction outer side at the top bent portion 28c, and the width direction outer side of the lower slope portion 28b is twisted by 90°. The direction changes to the outer surface 41b1 (see FIG. 11).

When the rear leg 25 is twisted at the top bent portion 28c, the lower inclined portion 28b is offset inward in the width direction from the upper inclined portion 28d by the entire width of the upper inclined portion 28d. The top bent portion 28c is a bent portion that bends the lower inclined portion 28b downward and rearward with respect to the upper inclined portion 28d. It is a displacement portion that displaces the lower inclined portion 28b inward in the width direction.

The steel pipe portion 2C (rear downward extending portion 29a), which is linearly connected to the lower rear portion of the lower inclined portion 28b of the rear leg 25, supports the backrest load of the seated person M1. The lower end 26 is grounded at a position in the front-rear direction that extends rearward and is equivalent to the upper end 4d (also the rear end) of the backrest 4. As shown in FIG. The backrest load is a rearward load input to the backrest 4 when the seated person M1 leans against the backrest 4 . A rear leg cover 27 made of, for example, synthetic resin or non-woven fabric is attached to the lower end portion 26 of the rear leg 25 . A groove-shaped (concave) or bead-shaped (convex) non-slip pattern is formed on the lower surface (ground contact surface) of the rear leg cover 27 .

Referring to FIG. 7, when a plurality of chairs 1 are arranged in the front-rear direction (depth direction), the rear downward extending portion 29a of the rear leg 25 of the chair 1 positioned on the front side is aligned with the front leg of the chair 1 positioned on the rear side. 20 and the position in the front-rear direction overlap. The rearwardly downward extending portion 29 a of the rear leg 25 is offset inward in the width direction by an amount exceeding the full width of the rearwardly upward extending portion 29 , that is, by an amount exceeding the entire width of the front leg 20 . Therefore, as shown in FIG. 6, the distance K2 between the outer side surfaces 41b1 of the rear downward extending portions 29a of the left and right rear legs 25 is smaller than the distance K1 between the inner side surfaces 42 of the left and right front legs 20. As shown in FIG.

Therefore, the rear downward extending portions 29a of the left and right rear legs 25 of the chair 1 positioned on the front side can enter the width direction inside of the left and right front legs 20 without interfering with the left and right front legs 20 of the chair 1 positioned on the rear side. becomes possible. Therefore, it is possible to stack the chairs 1 arranged in the front-rear direction in a telescopic manner. In addition, since the offset amount of the rear upper extending portion 29 is suppressed to exceed the full width of the rear upper extending portion 29, the pitch between the rear lower extending portions 29a of the left and right rear legs 25 is ensured, and the stability of the chair 1 is ensured. less impact on Further, since the rear leg 25 is twisted at the top bent portion 28c to offset the rear downward extending portion 29a, displacement of the rear downward extending portion 29a is less than when the rear downward extending portion 29a is offset in a stepped manner. It becomes smooth and suppresses the occurrence of stress concentration.

1 to 4, a connecting rod portion 30 spans between the upper end portion of the front upper extension portion 24 of the front leg 20 and the upper end portion of the rear upper extension portion 29 of the rear leg 25 . The connecting rod portion 30 forms a substantially horizontal elbow rest surface 5a along the extending direction. The elbow rest surface 5 a extends substantially horizontally in the front-rear direction along the connecting rod portion 30 . Specifically, the elbow rest surface 5a is inclined downward to the rear, and extends in the front-rear direction in a curved shape that is convex upward when viewed from the side.

11 and 12, the connecting rod portion 30 has a rectangular basic cross-sectional shape S1 that is substantially the same as the cross-sectional shape of the front and rear legs 20 and 25, and has a lower surface opposite to the elbow rest surface 5a. In addition, it has an inverted triangular protrusion 30a having a width slightly narrower in the width direction than the basic cross-sectional shape S1 in a cross-sectional view. As a result, the connecting rod portion 30 forms an approximately inverted triangular cross-sectional shape as a whole. On both sides of the connecting rod portion 30 in the width direction, since the basic cross-sectional shape S1 and the protrusion 30a have different widths, stepped portions 30b that are recessed in a cross-sectional view are formed. The stepped portion 30 b is formed to extend along the extending direction of the connecting rod portion 30 .

Since the stepped portions 30b are formed on both sides of the lower portion of the connecting rod portion 30, it becomes easier for the seated person M1 or the like to put his or her fingers on the connecting rod portion 30 (the armrest 5). A front bent portion 33 and a rear bent portion 34, which are bent at an acute angle in side view, are provided at the front and rear ends of the connecting rod portion 30, so that the seated person M1 or the like can bend the front and rear ends of the connecting rod portion 30 (armrest 5). It becomes easier to put a finger on. The front and rear end portions of the protrusion 30 a disappear on the inner peripheral sides of the front bent portion 33 and the rear bent portion 34 .

5 and 6, the front leg 20 linearly extends across the upper and lower ends when viewed in the front-rear direction without changing its position in the width direction. The connecting rod portion 30 extends linearly across the front and rear end portions when viewed in the vertical direction without changing the position in the width direction. The upper portion of the rear leg 25 (rear upper extending portion 29) extends linearly so as to overlap the front leg 20 when viewed in the front-rear direction without changing its position in the width direction. The lower portion of the rear leg 25 (rear downward extending portion 29a) forms a straight line avoiding the front leg 20 as viewed in the front-rear direction without changing the width direction position at a position that avoids the front leg 20 inward in the width direction as viewed in the front-rear direction. extending in the shape of

Also referring to FIG. 11, the upper portions of the front leg 20, the connecting rod portion 30 and the rear leg 25 form outer side surfaces 41a, 41b and 41c perpendicular to the width direction of the chair 1 on the width direction outer sides thereof. . These outer surfaces 41 a , 41 b , 41 c form the widthwise outer surface 41 of the leg 2 and thus of the chair 1 . In other words, the front legs 20 , the connecting rods 30 and the upper portions of the rear legs 25 extend along the outer surface 41 of the chair 1 .

When the chair 1 is adjacent to another chair 1 in the width direction, the lateral surfaces 41 of the legs 2 of the adjacent chairs 1 can be in contact with each other without gaps. Specifically, the upper outer surfaces 41a, 41b, 41c of the front legs 20, connecting rods 30, and rear legs 25 of the adjacent chairs 1 can be in contact with each other without gaps. Adjacent chairs 1 can be connected by the connecting mechanism 17 in a state in which the outer surfaces 41 of the legs 2 are in contact with each other. The connecting mechanism 17 arranges the widthwise outer end faces of the first member 18 and the second member 19 on the outer side surface 41 .

When the adjacent chairs 1 are connected by the connecting mechanism 17, the first member 18 of one chair 1 and the second member 19 of the other chair 1 abut against each other, and the outer surfaces 41 of the legs 2 are brought into contact with each other. It will be in a contact state.
Thereby, when a plurality of chairs 1 are arranged side by side and connected, no gap is generated between the upper parts of the front legs 20, the connecting rods 30 and the rear legs 25 of the adjacent chairs 1. - 特許庁Therefore, it is possible to prevent foreign matter from entering between the adjacent front legs 20 (especially between the forward extending portions 21a) and to form a wide flat armrest surface 5a on the upper surface of the armrest 5.

Here, the modified chair 101 will be described with reference to FIG. 13 .
In the chair 101, the front legs 20 are provided with forward extending portions 21a as extended ground contact portions 2D. An extension portion 126a is provided as an extension ground portion 2D. A rear leg cover 127 similar to the front leg cover 22 is attached to the rear extension 126a.

The rear leg 25 of the chair 101 has a rear leg vertical rod portion 128 that vertically extends upward from a base end portion (front end portion) 126b of the rear extension portion 126a. A portion of the rear leg 25 including the rear extension portion 126a and the rear leg vertical rod portion 128 is formed in an L shape when viewed from the side. Above the rear leg vertical rod portion 128, the upper portion of the rear downward extending portion 29a continues through the intermediate bent portion 128a. A rear end portion of a support member 35 is coupled to and supported by an upper portion of the rear downward extending portion 29a. That is, the rear leg 25 has a rear leg vertical rod portion 128 extending vertically from the portion supporting the seat support portion to the lower end portion 126 .

In the modified example of FIG. 13, both the front leg 20 and the rear leg 25 are provided with the vertical rod portions 23 and 128, but for example, the front leg vertical rod portion 23 of the front leg 20 is eliminated and the downward inclined portion 23b is extended to the corresponding portion. It may be provided with a leg rod that is inclined and extended. That is, at least one of the front leg 20 and the rear leg 25 has vertical rod portions 23 and 128 extending vertically from the portion supporting the seat support portion to the lower end portions 21 and 126. It is sufficient if the configuration is

When the front leg vertical rod portion 23 of the front leg 20 is eliminated as described above, the forward extending portion 21a (extended ground contact portion 2D) of the front leg 20 may be eliminated. That is, of the front legs 20 and the rear legs 25, the legs having the vertical rod portions 23 and 128 extend along the chair installation surface F toward the side away from the seat support portion in the front-rear direction. It is sufficient if the configuration is provided with

In the chair 1 according to the above-described embodiment, the portion of the front leg 20 that extends above the seat 3 is the front upper extension portion 24 that extends obliquely forward and upward in a side view. A portion extending upward from 3 is a rearwardly upward extending portion 29 that obliquely extends rearwardly upward in a side view. Between the upper end of the front upper extending portion 24 and the upper end of the rear upper extending portion 29, a connecting rod portion 30 constituting the armrest 5 is provided. It is supported by front legs 20 and rear legs 25 respectively.

By supporting the armrest 5 with the rod-shaped front and rear legs 20 and 25 in this manner, the configuration around the armrest 5 is simple and lightweight. Since the part of the front leg 20 extending upward from the seat 3 becomes the front upper extension part 24 inclined so as to be located rearward toward the seat surface 3a side, the front leg 20 supports the front end of the connecting rod part 30. , the projection of the leg member (front leg 20) to the side of the seat 3 is suppressed.

Furthermore, since the portion of the rear leg 25 extending upward from the seat 3 is formed as a rear upper extending portion 29 that is inclined so as to be located forward toward the seat surface 3a side, the rear leg 25 is positioned behind the connecting rod portion 30. While supporting the end portion, the leg member (rear leg 25) is prevented from projecting to the side of the seat 3 at the rear portion of the seat 3 as well. In addition, narrowing the space between the front and rear legs 20, 25 contributes to a slim and lightweight appearance.

A support member 35 spans between the front and rear legs 20 and 25 at a portion below the front upper extending portion 24 and the rear upper extending portion 29 . As a result, the upper and lower middle portions of the front and rear legs 20, 25 are connected to each other, and the strength and rigidity of the entire leg 2 are ensured. support strength (strength rigidity of the support member 35) is efficiently ensured. In addition, since the front and rear legs 20 and 25 have the front upper extending portion 24 and the rear upper extending portion 29, the distance between the front and rear legs 20 and 25 is narrower than the distance between the upper ends, and the support member 35 is increased in size. is suppressed, and the support strength of the seat 3 (strength and rigidity of the support member 35) is ensured in this respect as well.

As described above, the chair 1 in the above embodiment includes a seat 3 having a seat surface 3a and a pair of seats spaced apart in the width direction of the chair 1. and a pair of left and right legs 2 for supporting, each of the left and right legs 2 extending in the vertical direction while being spaced apart from each other in the front-rear direction. A rear leg 25 and a connecting rod portion 30 connecting the upper ends of the front leg 20 and the rear leg 25 are provided. At least one of the front leg 20 and the rear leg 25 is provided with a front upper extension portion 24 that obliquely extends forward and upward. It is

According to this configuration, the seat 3 that receives the seating load is supported by the front legs 20 and the rear legs 25 of the left and right legs 2 that are spaced apart in the left and right direction, so that the seat 3 is stably supported. can do. In addition, the weight and size of the chair 1 can be reduced as compared with the case where large standing wall-shaped legs are provided on both sides of the chair 1 in the width direction. In addition, since the armrest 5 is configured including the connecting rod portion 30 that connects the upper ends of the front legs 20 and the rear legs 25, the structure around the armrest 5 is simplified, and the weight and size of the chair 1 are also suppressed in this respect. be able to. Moreover, due to the reduction in weight and size, it is possible to ensure good installation workability of the chair 1 .

A portion of at least one of the front legs 20 and the rear legs 25 that extends above the seat 3 is a front upper extension portion 24 that obliquely extends forward and upward. Since the connecting rod portion 30 is supported by the portion, the connecting rod portion 30 and thus the armrest 5 can be supported at a more forward position, and the support strength of the front portion of the armrest 5 can be secured.
In addition, since the lower part of the front upper extension part 24 is positioned rearward, the front part of the armrest 5 is supported by the front upper extension part 24, while suppressing the influence on the movable range of the thigh of the seated person. be able to.
Thus, in the chair 1 of the present embodiment, it is possible to secure the installation workability of the chair 1, secure the supporting strength of the front part of the armrest 5, and further secure the freedom of movement of the lower limbs of the seated person. .

Further, in the chair 1 of the present embodiment, the front leg 20 forms the front upper extension portion 24, and the rear leg 25 extends rearward and upward obliquely behind the front leg 20. A portion 29 is provided, and the connecting rod portion 30 is supported at the upper end portion of each of the front upper extending portion 24 and the rear upper extending portion 29 .
According to this configuration, each of the front leg 20 and the rear leg 25 extends above the seat 3 to form a front upper extension portion 24 and a rear upper extension portion 29. Since the front and rear portions of the connecting rod portion 30 are respectively supported by the upper end portion of the upwardly extending portion 29, the connecting rod portion 30 and thus the armrest 5 can be supported in a well-balanced manner against the load in the vertical direction, thereby supporting the front portion of the armrest 5. Good strength can be ensured.

Further, in the chair 1 of this embodiment, each of the left and right legs 2 includes a support member 35 (seat support portion) that supports the seat, and the support member 35 is positioned between the front leg 20 and the rear leg 25. The front end is supported by the front leg 20 and the rear end is supported by the rear leg 25 .
According to this configuration, the seat support portion is arranged between the front legs 20 and the rear legs 25 and supported by the front legs 20 and the rear legs 25, so that the support strength of the seat 3 can be easily ensured. It is possible to reduce the size and weight of the peripheral structure. In addition, since the seat support does not protrude forward or backward beyond the front legs 20 and the rear legs 25, the chances of the protruding part of the chair 1 coming into contact with the user's body are reduced, and the effect on the installation workability of the chair 1 is suppressed. At the same time, it is possible to suppress the influence on the degree of freedom of movement of the body of the seated person.

Further, in the chair 1 of the present embodiment, the seat 3 has a use position P1 in which the seat surface 3a is directed upward, a flip-up position P2 in which the front end portion is moved upward with respect to the use position P1, and a biasing mechanism 16 that biases the seat 3 from the use position P1 to the flip-up position P2, wherein the biasing mechanism 16 is attached to the seat support portion supported by
According to this configuration, the front legs 20 and the rear legs 25 can stably support the load due to the operation of the pivotal (flip-up) seat 3, the biasing reaction force received from the biasing mechanism 16, and the like. can. Therefore, it is possible to easily ensure the stability of the operation of the seat 3 and reduce the size and weight of the peripheral structure.

In addition, in the chair 1 of the present embodiment, each of the front legs 20 and the rear legs 25 has a rectangular cross section and extends from the chair installation surface F to the connecting rod portion 30, and the front legs 20 and the rear legs One (front leg 20) of 25 extends from the chair installation surface F to the connecting rod portion 30 with the longitudinal direction along the long side of the rectangular shape in the cross section parallel to the width direction. The other of the rear legs 25 (rear leg 25) forms a twisted portion (top bending portion 28c) that twists the direction of the cross section by 90° on the way from the chair installation surface F to the connecting rod portion 30, and the front leg 20 and the rear leg 25, the upper part of the leg (rear upward extension part 29) on the side of the connecting rod part 30 from the twisted part has the longitudinal direction along the long side of the rectangular shape in the cross section parallel to the width direction. and extends in the same position in the width direction as one of the front legs 20 and the rear legs 25 (the front legs 20), and is closer to the chair installation surface F than the twisted portion of the other of the front legs 20 and the rear legs 25. The lower leg portion (rear downward extending portion 29a) extends in such a manner that the transverse direction along the short side of the rectangular shape in the cross section is parallel to the width direction, and is displaced further inward in the width direction than the upper leg portion. .

According to this configuration, each of the front leg 20 and the rear leg 25 has a rectangular cross section and extends from the chair installation surface F to the connecting rod portion 30, so that it is easy to secure a contact area with respect to the chair installation surface F. It is easy to secure the width of the connecting rod portion 30, which contributes to improving the installation stability of the chair 1 and the stability of the armrest 5.
In particular, one of the front leg 20 and the rear leg 25 (the front leg 20) has the longitudinal direction of the cross section oriented in the width direction over the upper and lower ends, so that it is easier to secure the ground contact area on the chair installation surface F, and the connection It becomes easier to secure the width of the rod portion 30 . The other of the front leg 20 and the rear leg 25 (rear leg 25) is oriented in the width direction on the chair installation surface F side of the twisted portion, while on the chair installation surface F side of the twisted portion. , extends in the width direction in the lateral direction of the cross section, and is offset inward in the width direction at the twisted portion. As a result, when a plurality of chairs 1 are approached in the front-rear direction, the other chair installation surface F side of the front leg 20 and the rear leg 25 can be inserted between the left and right leg rods of one of the front leg 20 and the rear leg 25.例文帳に追加becomes possible. Therefore, a plurality of chairs 1 can be stacked in a nested manner in the front-rear direction, and the plurality of chairs 1 can be efficiently stored in a trolley or warehouse.

In addition, in the chair 1 of the present embodiment, the connecting rod portion 30 has a triangular cross section and extends in the front-rear direction.
According to this configuration, when the connecting rod portion 30 is gripped when the chair 1 is installed and put away, the connecting rod portion 30 becomes easier to hold, and the installation workability of the chair 1 can be further improved.

<Second embodiment>
Next, a second embodiment of the invention will be described with reference to FIGS. 14 to 17. FIG.
This embodiment is particularly different from the portable chairs 1 and 101 in the first embodiment and modification in that the chair 201 is fixed to the floor. The same reference numerals are assigned to other configurations that are the same as those of the above-described embodiment, and detailed description thereof will be omitted.

A chair 201 has a pair of left and right legs 202 . Unlike the left and right legs 102 of the modified example of the first embodiment, the left and right legs 202 do not have the extended ground contact portions 2D in either of the front and rear legs 20 and 25 . In the left and right legs 202, the lower ends 21, 26 of the front and rear legs 20, 25 are connected via a lower end connecting rod portion 230 extending in the front-rear direction along the chair installation surface F. The lower end connecting rod portion 230 is fixed to the chair installation surface F by bolts or the like, so that the chair 201 is fixedly installed on the chair installation surface F. As shown in FIG. The lower end connecting rod portion 230 forms the lower end surfaces of the left and right legs 202 together with the lower end portions 21 and 26 of the front and rear legs 20 and 25 . The portions forming the lower end surfaces of the left and right legs 202 are abutted and supported by the chair installation surface F via grounding members 222 .

For example, the lower end connecting rod portion 230 is integrally formed by aluminum die casting or the like in a manner in which the lower end portions 21 and 26 of the front and rear legs 20 and 25 are integrated above the front and rear end portions. Reference numeral 2E in the drawing indicates a molded portion including the lower end portions 21, 26 of the front and rear legs 20, 25 and the lower end connecting rod portion 230. As shown in FIG. The lower ends 21, 26 of the front and rear legs 20, 25 in the molded portion 2E are integrally joined to the lower ends of the remaining rod-shaped portions (steel pipe portions) 2B, 2C of the front and rear legs 20, 25 by welding, bolting, or the like. It is
For example, the lower end connecting rod portion 230 has a rectangular cross-sectional shape that is substantially the same as the cross-sectional shape of the front and rear legs 20 and 25 . The lower end portion 26 of the rear leg 25 offset inward in the width direction is connected to the rear end portion of the lower end connecting rod portion 230 so as to bend outward in the width direction.

For example, the chair 201 of this embodiment is installed on each step (chair installation surface F) of a stepped floor. The stepped floor is formed so as to gradually become lower toward the front of the seated person. A plurality of chairs 201 are arranged side by side in the left-right direction on each step of the stepped floor having different heights.

The left and right legs 202 of the chairs 201 can contact the outer surfaces 41 with the legs 202 of the adjacent chairs 201 when a plurality of chairs 201 are arranged adjacent to each other in the left-right direction. The outer surface 41 of the leg 202 includes upper outer surfaces 41a, 41b, and 41c of the front leg 20, the connecting rod portion 30, and the rear leg 25, as well as the outer surface 41a2 of the lower end connecting rod portion 230. . The front leg 20 , the upper portion of the connecting rod portion 30 and the rear leg 25 , and the lower end connecting rod portion 230 are arranged on the outermost side of the chair 201 in the width direction. The outer surface 41 of the leg 202 is a plane orthogonal to the width direction, and constitutes the outermost surface of the chair 201 in the width direction.

By bringing the outer surfaces 41 of the legs 202 of the adjacent chairs 201 into contact with each other, the upper portions of the front legs 20, the connecting rods 30 and the rear legs 25, and the lower end connecting rods 230 of both chairs 201 each have a rectangular cross section. However, contact is possible without gaps in the width direction. In particular, since there is no space between the adjacent lower end connecting rod portions 230 on the floor surface F, it is difficult for foreign matter such as dirt and dust to accumulate between the adjacent lower end connecting rod portions 230 .

Further, in the chair 201 according to the second embodiment as well, the connecting rod portion constituting the armrest 5 is placed between the upper end portion of the front upper extending portion 24 of the front leg 20 and the upper end portion of the rear upper extending portion 29 of the rear leg 25. The front and rear ends of the connecting rod portion 30 are supported by the front leg 20 and the rear leg 25, respectively. Therefore, as in the first embodiment, the configuration around the armrest 5 is simple and lightweight, the leg members (the front legs 20 and the rear legs 25) are prevented from projecting to the sides of the seat 3, and the front and rear legs 20 , 25 is narrowed. Since the supporting member 35 is supported between the front and rear legs 20 and 25 below the front upper extending portion 24 and the rear upper extending portion 29, the support strength of the seat 3 (strength and rigidity of the support member 35) is efficiently ensured.

Below the front upper extension portion 24 and the rear upper extension portion 29, the support member 35 is bridged between the front and rear legs 20, 25, so that the upper and lower intermediate portions of the front and rear legs 20, 25 are connected to each other. The strength and rigidity of the entire leg 202 is ensured, and the support member 35 is supported by the front and rear legs 20 and 25, so that the support strength of the seat 3 (strength and rigidity of the support member 35) is efficiently ensured. In addition, since the space between the front and rear legs 20 and 25 is narrowed, the size of the support member 35 is suppressed, and the support strength of the seat 3 (strength and rigidity of the support member 35) is efficiently ensured in this respect as well.

As described above, in the chair 201 of the second embodiment, at least one of the front legs 20 and the rear legs 25 has the front upper extension portion 24 that obliquely extends forward and upward, as in the first embodiment. , the connecting rod portion 30 is supported on the upper end portion of the front upper extending portion 24 . As a result, the weight and size of the chair 201 can be suppressed, and the installation workability of the chair 201 can be satisfactorily secured. Further, the connecting rod portion 30 and thus the armrest 5 can be supported at a more forward position, and the supporting strength of the front portion of the armrest 5 can be secured. In addition, since the lower part of the front upper extension part 24 is positioned rearward, the front part of the armrest 5 is supported by the front upper extension part 24, while suppressing the influence on the movable range of the thigh of the seated person. be able to.

Further, the front leg 20 includes the front upper extension portion 24, and the rear leg 25 includes a rear upper extension portion 29 that extends diagonally rearward and upward behind the front upper extension portion 24, The connecting rod portion 30 is supported by the upper end portion of each of the front upper extending portion 24 and the rear upper extending portion 29 . As a result, the connecting rod portion 30 and thus the armrest 5 can be supported in a well-balanced manner against the load in the vertical direction, and the supporting strength of the entire armrest 5 can be favorably secured.

In addition, each of the left and right legs 202 includes a seat support portion (support member 35) that supports the seat 3. The seat support portion is arranged between the front leg 20 and the rear leg 25 and has a front end It is supported by the front legs 20 and its rear end is supported by the rear legs 25 . As a result, it is possible to reduce the size and weight of the seat support portion and the peripheral structure, suppress the influence on the installation workability of the chair 201, and suppress the influence on the degree of freedom of movement of the seated person.

The present invention is not limited to the above embodiment. For example, when the front and rear legs 20 and 25 cross each other in an X shape, the rear leg 25 forms the front upper extending portion 24 and the front leg 20 forms the rear upper portion. An extension 29 may be formed. That is, a portion of at least one of the front and rear legs 20 and 25 extending upward from the seat 3 forms a front upper extending portion 24, and a connecting rod portion 30 (armrest 5) is provided at the upper end portion of the front upper extending portion 24. It is sufficient if the front part of the is supported.
For example, the biasing mechanism 16 is not limited to being arranged between the front leg 20 and the rear leg 25, but is arranged in front of the front leg 20 or rearward of the rear leg 25, and via transmission elements such as gears, belts and chains, A configuration in which the seat 3 is biased may be used.
The configuration in the above embodiment is an example of the present invention, and various modifications, such as replacing the constituent elements of the embodiment with known constituent elements, are possible without departing from the gist of the present invention.

REFERENCE SIGNS LIST 1, 101, 201 Chair 2, 102, 202 Leg 3 Seat 3a Seat surface 5 Armrest 16 Biasing mechanism 20 Front leg 24 Front upper extension 25 Rear leg 28c Top bent portion (twisted portion)
29 rear upper extension (upper leg)
29a rear downward extension (lower leg)
30 connecting rod portion 35 support member (seat support portion)
F Chair installation surface P1 Usage position P2 Flip-up position

Claims (6)

a seat having a seating surface;
a pair of left and right legs provided spaced apart in the width direction of the chair, standing on the chair installation surface, and supporting the seat;
with
each of the left and right legs,
a front leg and a rear leg that are separated from each other in the front-rear direction and extend in the vertical direction, the upper end portion of which is arranged above the seat;
a connecting rod portion that connects between the upper ends of the front legs and the rear legs;
Each connecting rod portion of the left and right legs constitutes a pair of left and right armrests,
At least one of the front leg and the rear leg has a front upward extension extending diagonally forward and upward,
The connecting rod portion is supported by the upper end portion of the front upper extending portion ,
each of the front legs and the rear legs extends from the chair mounting surface to the connecting rod;
The rear leg has a twisted portion that twists the direction of the cross section by 90° on the way from the chair installation surface to the connecting rod portion,
A portion of the rear leg below the twisted portion is a rearwardly downward extending portion extending linearly rearwardly downwardly to reach the chair installation surface,
The rear downward extending portion is offset inward in the width direction when the rear leg is twisted at the twist portion, and is displaced and extended inward in the width direction relative to the front leg. Chair. The front leg includes the front upper extension,
The rear leg includes a rear upper extension portion that extends obliquely rearward and upward behind the front upper extension portion,
2. The chair according to claim 1, wherein said connecting rod portion is supported by upper ends of said front upper extending portion and said rear upper extending portion. each of the left and right legs includes a seat support that supports the seat;
3. The seat support part according to claim 1, wherein the seat support part is arranged between the front leg and the rear leg, and has a front end supported by the front leg and a rear end supported by the rear leg. chair. The seat is rotatable between a use position in which the seat surface faces upward and a flip-up position in which the front end portion is moved upward with respect to the use position,
a biasing mechanism that biases the seat in a direction to rotate the seat from the use position to the flip-up position;
4. The chair of claim 3, wherein said biasing mechanism is supported by said seat support. 5. The chair according to any one of claims 1 to 4 , wherein the connecting rod portion has a triangular cross section and extends in the front-rear direction. a seat having a seat surface;
a pair of left and right legs provided spaced apart in the width direction of the chair, standing on the chair installation surface, and supporting the seat;
with
Each of the left and right legs,
a front leg and a rear leg that are separated from each other in the front-rear direction and extend in the vertical direction, the upper end portion of which is arranged above the seat;
a connecting rod portion that connects between the upper ends of the front legs and the rear legs;
Each connecting rod portion of the left and right legs constitutes a pair of left and right armrests,
At least one of the front leg and the rear leg has a front upward extension extending diagonally forward and upward,
The connecting rod portion is supported by the upper end portion of the front upper extending portion,
each of the front legs and the rear legs has a rectangular cross section and extends from the chair mounting surface to the connecting rod;
one of the front leg and the rear leg extends from the chair installation surface to the connecting rod portion with the longitudinal direction along the long side of the rectangular shape in the cross section parallel to the width direction;
The other of the front leg and the rear leg has a twisted portion that twists the direction of the cross section by 90° on the way from the chair installation surface to the connecting rod portion,
The upper portion of the other of the front leg and the rear leg, which is closer to the connecting rod portion than the twisted portion, has a longitudinal direction along the long side of the rectangular shape in the cross section parallel to the width direction, and the front leg and the rear leg. Extending at the same position in the width direction as one,
The leg lower part of the other of the front leg and the rear leg on the side of the chair installation surface from the twisted part has a short side direction along the short side of the rectangular shape in the cross section parallel to the width direction, and is further than the upper leg part. A chair characterized by being displaced and extending inward in the width direction.

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