JP2022023235A - chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve seating comfort as a chair without deteriorating compactness in a nested state, in a chair composed in a manner capable of nesting.

SOLUTION: The chair includes: a leg body in which a laterally extending support frame is supported by a leg part; and a seat body that is stretched with a sheet like member which becomes a seating face in a region surrounded with a frame body and that is rotatably fixed around a shaft laterally extending in the rear side of the frame body. In the reverse faces of a left piece and a right piece respectively of the frame body of the seat body, there is installed a pair of positioning members that positions the seat body in a state capable of seating. The positioning member has a prescribed amount projecting from the reverse face of the frame body so that the lower end of the sheet like member, in the case of deformation of the sheet like member by seating on the seat body, is turned to a positional relation in contact with the support frame in a state above the upper end of the support frame.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a chair provided with a leg body and a sitting body.

Conventionally, as chairs used in halls and the like, in order to reduce the storage space when not in use, so-called nesting-capable chairs are known in which the seats are stacked in the front-rear direction with the seats flipped up. ing.

In this type of chair, the seat is positioned by a frame extending in the left-right direction at the upper part of the leg so that it can be accommodated compactly in the nesting state and also to secure sufficient strength as a chair. (Patent Document 1,
2).

JP-A-2005-279532 JP-A-2005-218534

In recent years, not only the chairs that can be nested as described above, but also the seat body is made to have a sheet-like member attached to the frame body to improve the sitting comfort as a chair. Prior art cannot meet such demands as they are.

This is because the structure is such that the frame placed directly under the seat receives the load in order to maintain compactness, so if the seat-like member deforms downward when seated on the seat, it will come into contact with the frame. This is because further deformation is hindered and the sitting comfort is rather uncomfortable.

The present invention has been made to solve such a problem, and an object thereof is to improve the sitting comfort as a chair in a chair configured so as to be nestable without reducing the compactness in the nesting state. Is to let.

In order to solve the above problems, the first configuration consists of a leg body in which a support frame extending in the left-right direction is supported by a leg portion, and a sheet-like member serving as a seating surface is attached to a region surrounded by the frame body. , A seat body rotatably fixed around an axis extending in the left-right direction on the rear side of the frame body, and a left piece of the frame body of the seat body extending back and forth on the left-right side side. On the back surface of each of the right piece and the right piece, a pair of positioning members for positioning the seat body in a seatable state by protruding from the back surface and contacting the support frame are provided, and the positioning member is the above-mentioned positioning member. The frame so that the lower end of the seat-shaped member is in contact with the support frame while being above the upper end of the support frame when the seat-shaped member is deformed by sitting on the seat. The amount of protrusion from the back of the body is defined.

With a chair configured in this way, even if the seat-like member is deformed by sitting on the seat, even though it adopts a structure that receives the load by the support frame placed directly under the seat, The lower end thereof does not come into contact with the support frame, and the deformation of the seat-shaped member due to seating is not hindered. Therefore, it is possible to suitably improve the sitting comfort as a chair while ensuring the compactness in the nesting state by the above structure.

By the way, in the above configuration, the anterior-posterior position corresponding to the ischial tuberosity of the seated person, that is, the position along the anterior-posterior direction in which the ischial tuberosity of the seated person is assumed to be located can be the position of the center of gravity in the anterior-posterior direction of the seated person. It is effective to ensure the strength of the chair when seated, at least in the back surface of the frame body in the sitting body, in which a load can be received in a region extending back and forth with this position as a reference position.

For this purpose, it is conceivable that the above configuration is changed to the second configuration or the third configuration shown below.
In the second configuration, the positioning member includes a set of projecting pieces protruding from each of the front and rear ends of a predetermined region extending in the front-rear direction including the reference position on the back surface of the frame body, and the set of protrusions. It is composed of a connecting piece that connects the pieces on the tip side thereof, and the seat body is positioned by contacting the connecting piece with the support frame.

In the third configuration, the positioning member is formed as a plate-shaped protrusion protruding over a predetermined region extending in the front-rear direction including the reference position on the back surface of the frame body.
With the chair having these configurations, the positioning member can receive a load in a region where the seated body can be the center of gravity of the seated person, so that the strength of the chair when seated can be suitably secured.

In particular, when the positioning member is composed of a set of projecting pieces and connecting pieces as in the second configuration, the frame-shaped structure can easily cause elastic deformation. Therefore, for example, in a seated state. By designing it to be elastically deformed only by a load exceeding the load in, it is possible to have a function of absorbing a large load generated at the time of sitting.

Further, it is conceivable that these configurations are the fourth configurations shown below.
In the fourth configuration, the positioning member has a shape in which the width in the front-rear direction narrows toward the tip, and the upper surface of the support frame as a member serves as a contact region with the positioning member, and is viewed from the side. The front end of the member reaches a position where the front end surface of the positioning member overlaps with a line extending along the front end surface.

With the chair configured in this way, the width of the positioning member in the front-rear direction becomes narrower toward the tip, so that the front-rear width of the region of the support frame that comes into contact with the positioning member is also shorter in accordance with this front-rear width. This allows for greater compactness during nesting.

Further, each of the above configurations may be as the fifth configuration shown below.
In the fifth configuration, the positioning member has an extending region extending forward in a side view, and the width in the front-rear direction including the extending region is narrowed toward the tip.

With a chair configured in this way, the front end side including the extension area of the positioning member is in a state of supporting and reinforcing each of the left and right ends of the seat body from the back surface, and it is only possible to improve the strength of the seat body. Instead, the seat body acts so that it gradually bends toward its front end, so that the deformation of the seat body due to contact with the seated person's legs (especially the back side of the thigh) is less likely to be hindered, and as a result, as a chair. The sitting comfort can be made good.

Further, each of the above configurations may be the sixth configuration shown below.
In the sixth configuration, the pair of positioning members are connected by a reinforcing frame extending from the tip on one side to the tip on the other in the left-right direction.

With the chair configured in this way, the strength of the chair when seated can be further improved by connecting each of the positioning members with a reinforcing frame.
Further, each of the above configurations may be the seventh and eighth configurations shown below.

In the seventh configuration, the support frame is formed with an inner restricting piece that regulates the displacement of the positioning member inward in the left-right direction in a region adjacent to the contact region with the positioning member.

In the eighth configuration, the support frame is formed with an outer restricting piece that regulates the displacement of the positioning member to the outside in the left-right direction in a region adjacent to the contact region with the positioning member.

With chairs related to these configurations, the restricting piece of the support frame is placed in the area adjacent to the contact area with the positioning member, and the positional relationship between the two is clear, so that the user can sit on the seat. Positioning to a suitable state can be performed reliably and easily.

Further, in the configuration in which the inner restricting piece is formed, even if the positioning member is displaced inward in the left-right direction due to the load at the time of seating, this displacement is regulated by the inner restricting piece, so that the chair is seated. The strength of time can be further improved.

Further, in the configuration in which the outer restricting piece is formed, even when a large load is applied such as when seated and the positioning member is displaced outward in the left-right direction, this displacement is regulated by the outer restricting piece. Unintentional deformation due to load can be prevented.

Further, each of the above configurations may be the ninth configuration shown below.
In the ninth configuration, the positioning member projects from the back surface of the seat body so as to be inclined inward in the left-right direction, and comes into contact with the support frame at a position inside the left-right outer surface of the seat body. It is configured to do.

With a chair configured in this way, the positioning member comes into contact with the support frame at a position inside the left and right outer surfaces of the seat, and as a result, a certain distance is secured to this contact area, and as a result, the seated person It is possible to prevent the situation where the fingertips of the chair are pinched.

Six-sided view showing the overall configuration of the chair (the left side view is omitted) AA sectional view in front view Perspective view showing the characteristic part of the chair Perspective view showing the characteristic portion of the chair in another embodiment A diagram showing how multiple chairs are in the nesting state. Perspective view showing the characteristic portion of the chair in another embodiment Front view of the main part showing the characteristic part of the chair in another embodiment Right side view of the main part showing the frame of the sitting body in another embodiment Front view and right side view showing the overall configuration of the chair in another embodiment. The figure which shows the state which puts a plurality of chairs in a nesting state in another embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
(1) Configuration As shown in FIG. 1, the chair 1 includes a backrest 10, a seat 20, and a pair of left and right legs 30, 4.
It is a nesting chair provided with 0 and a support frame 50 extending in the left-right direction, and the same chair 1 can be stacked and stored (so-called nesting) in the front-rear direction.

The backrest 10 has a plate-shaped member having an arc shape that is convex toward the rear in a plan view, so that the backrest 10 has a shape that follows the back of the seated person as a whole, and is rearward from the upper end side thereof. It is provided with a strip-shaped strip 11 extending toward the surface and a pair of dorsal connecting pieces 13 extending downward from each of the lower ends on both the left and right sides and being connected to the support frame 50.

Of these, the strip-shaped piece 11 is composed of a portion extending rearward from each of the left and right end portions of the upper end of the backrest 10 and a strip-shaped portion connecting the portions in the left-right direction, whereby the upper end of the backrest 10 and the upper end of the backrest 10 are formed. It forms a horizontally long space surrounded by the strip-shaped piece 11. The band-shaped portion of the band-shaped piece 11 is used as a handle when moving the chair 1. The strip-shaped piece 11 is not limited to this configuration, and as shown in FIG. 4A, the strip-shaped piece 11 may be composed of only a strip-shaped portion, and may have a configuration in which a horizontally long space is not formed.

Further, the pair of dorsal connecting pieces 13 are arranged so as to sandwich the rear end side of the seat body 20 from the left and right, and as shown in FIG. 2, the seat body 20 is centered on a shaft body 15 extending in the left-right direction. It is rotatably fixed as. As a result, the seat body 20 is tilted down so that the seating surface is a surface along the ground (FIG. 3A), and the seat body 20 is flipped up so that the seating surface intersects the ground. It can rotate between the housed state (FIG. 3 (b)).

The backrest 10 is supported by a support frame 50 above the seat 20 so that it is horizontally elongated surrounded by the rear end of the seat 20 and the lower end of the backrest 10, as shown in FIG. 3 (c). A space is formed.

The seat body 20 is a region in which a sheet-like member 23 serving as a seating surface is attached to a region surrounded by a quadrangular frame body 21 in a plan view. In the present embodiment, as shown in FIG. 2, the front side frame body 21a and the back side frame body 21b are overlapped in the front and back directions, and the sheet-like member 23 is attached to the front side frame body 21a to form the back side frame. The body 21b is provided with a positioning member 100, which will be described later. The seat 20 has an ascending slope from the rear end to the front end (see the right side view), and the front end thereof is a hanging piece that hangs downward.

In this seat body 20, a pair of seat side fixings for fixing the seat body 20 to the backrest 10 at each position (left and right sides on the rear end side) corresponding to the pair of back side connecting pieces 13 of the backrest 10 A piece 25 is provided, and by fixing the piece 25 through the shaft body 15 described above, the entire seat body 20 can rotate with respect to the backrest 10 (see FIGS. 3A and 3B).

Further, of the frame body 21 in the seat body 20, a pair of positioning members 100 for positioning the seat body 20 so as to be seated are provided on the back surfaces of the left piece and the right piece extending back and forth on the left and right sides. ing.

The positioning member 100 protrudes from the back surface of the seat 20 and has a shape in which the width in the front-rear direction becomes narrower toward the tip in the side view (the trapezoidal shape in the present embodiment). The amount of protrusion from the seat body 20 is such that the lower end of the seat-shaped member 23 when the seat-shaped member 23 is deformed by sitting on the seat body 20 comes into contact with the support frame 50 in a state where the lower end thereof is above the upper end of the support frame 50. It is stipulated that there is a positional relationship. In the present embodiment, the positioning member 100 projects from the back surface of the seat body 20 so as to incline inward in the left-right direction, and the support frame 50 and the support frame 50 are located inside the left and right outer surfaces of the seat body 20. Contact (see front view of FIG. 1).

Here, as shown in FIG. 2, the anterior-posterior position corresponding to the ischial tuberosity of the seated person (that is, the position along the anterior-posterior direction in which the ischial tuberosity of the seated person is assumed to be located) in the sitting body 20 is assumed to be the reference position a. Then, the positioning member 100 has a set of projecting pieces 101 protruding from each of the front and rear ends of a predetermined region b extending in the front-rear direction including the reference position a on the back surface of the frame body 21, and the tip of each of the projecting pieces 101. It is composed of a connecting piece 103 connected on the side, and the connecting piece 103 is in contact with the support frame 50 to position the seat 20. Here, the positioning member 100 is not limited to the configuration including a set of the protruding pieces 101 and the connecting piece 103, and for example, as shown in FIG. 4B, the entire surface of the predetermined region b on the back surface of the frame body 21. It may be formed as a protrusion protruding over.

Further, as shown in FIG. 3B, each of the positioning members 100 has a tip (connecting piece 103) on one side connected to a tip (connecting piece 103) on the other side by a reinforcing frame 105 extending in the left-right direction. The reinforcing frame 105 is configured to connect the positioning member 100 only at the front and rear ends thereof, but is not limited to this configuration, and as shown in FIG. 4C, a plate-shaped member is adopted for positioning. Each of the tips of the members 100 may be connected over the entire front-rear width, or may not be provided as shown in FIG. 6 (b).

In addition, in this embodiment, each of the positioning members 100 is subjected to the load in the static strength test or the impact resistance test specified in JIS standard (S1203) regarding the test method for the strength and durability of the chair. A height defined so that the lower end of the sheet-shaped member 23 deformed by the load does not contact at least the upper surface of the support frame 50 (specifically, the height corresponding to the magnitude of the load and the elasticity of the sheet-shaped member 23 is 50 mm). Is secured. If the lower end portion of the seat body 20 does not come into contact with the upper surface of the support frame 50 due to this load, even if the seat-like member 23 is deformed by sitting on the seat body 20 due to seating by a seated person with the load or less. The lower end of the sheet-shaped member 23 does not come into contact with the upper end of the support frame 50.

The legs 30 and 40 are the front legs 31 and 41 provided so as to extend diagonally forward from the lower portions of the end sides of the support frame 50, and the end sides of the support frame 50 outside the front legs 31 and 41, respectively. It is provided with rear legs 33, 43 provided so as to extend diagonally rearward from the lower portion, and casters 35, 45 provided at the lower ends of each leg. In this way, the support frame 50 is supported by the legs 30 and 40 to form a leg body. The chair 1 may adopt a configuration that does not include these casters 35 and 45.

The legs 30 and 40 are formed so that their respective intervals are wider on the rear legs 33 and 43 sides than on the front legs 31 and 41 sides, so that chairs 1 having the same shape can be stacked in the front-rear direction. It is composed.

The support frame 50 includes a plate-shaped frame body 51 extending in the left-right direction, and a pair of support-side connecting pieces 53 extending upward from the upper portions of the end sides of the frame body 51 in the left-right direction and connected to the backrest 10. In the present embodiment, the frame main body 51 connects the legs 30 and 40 in the left-right direction. As shown in FIG. 2, the upper surface of the frame body 51 becomes a contact area with the positioning member 100, and the front end surface of the positioning member 100 overlaps with a line extended along the front end surface in a side view. , The front end as a member has reached.

The front end of the frame body 51 has a curved surface (semi-circular in side view in the present embodiment) that is inclined downward, and a convex portion 107 formed at the tip of the positioning member 100 is fitted therein. It is configured.

As shown in FIG. 5, the chair 1 having the above configuration can be overlapped in the front-rear direction by flipping up the seat 20 so that the seating surface of the seat 20 intersects the ground. It is ready to use and the storage space when not in use can be reduced.
(2) Modifications Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and may take various forms as long as it belongs to the technical scope of the present invention. Needless to say.

For example, in the above embodiment, a configuration in which a plate-shaped object extending in the left-right direction is adopted as the frame main body 51 of the support frame 50 is exemplified. However, the frame main body 51 is not limited to this configuration, and for example, as shown in FIG. 6, a columnar one extending in the left-right direction may be adopted.

In this configuration, considering that the positioning member 100 is likely to be elastically deformed along the curved outer peripheral surface of the frame body 51, the front end surface of the positioning member 100 is extended along the front end surface in a side view. It may have a front-rear width that allows the front end as a member to reach a certain distance behind the overlapping position.

Further, in the above embodiment, the contact region between the support frame 50 and the positioning member 100 may have the following configuration from the viewpoint of positioning the seat 20 and ensuring the strength of the chair 1. Specifically, as shown in FIG. 7, the inner restricting piece 55 that regulates the displacement of the positioning member 100 inward in the left-right direction in the region of the support frame 50 adjacent to the contact region with the positioning member 100. Or, an outer regulation piece 57 that regulates the displacement of the positioning member 100 to the outside in the left-right direction is provided.

Here, a protrusion is formed on the support frame 50 side, and the outer side of the protrusion in the left-right direction functions as the inner regulation piece 55, and the inner side in the left-right direction functions as the outer regulation piece 57, and these regulation pieces 55 are on the positioning member 100 side. The configuration in which the positioning hole 109 is formed so as to come into contact with the support frame 50 at the tip of the protrusion consisting of, and 57 is illustrated. However, the inner regulation piece 55 and the outer regulation piece 57 may be formed as separate members, and these regulation pieces 55 and 57 are arranged on the outer side and the inner side of the positioning member 100 in the left-right direction, respectively. May be.

Further, in the above embodiment, the configuration in which the positioning member 100 has a trapezoidal shape in which the width in the front-rear direction is linearly narrowed toward the tip in the side view is exemplified. However, the positioning member 100 may have a shape other than the trapezoidal shape as long as the width in the front-rear direction becomes narrower toward the tip in the side view. Specifically, as shown in FIG. 8, it has an extension area 120 extending forward in a side view, and the width in the front-rear direction including the extension area 120 becomes narrower toward the tip (vertical direction). It is conceivable to make the shape (the thickness becomes smaller toward the front). The extension region 12 may be extended to a predetermined position from the front end surface of the main body of the positioning member 100 to the region where the seat body 20 begins to hang downward.

Further, in the above embodiment, the legs 30 and 40 are supported by the support frame 50 by the pair of left and right legs 30, 40 and the support frame 50 connecting the legs 30 and 40 in the left-right direction. Is illustrated. However, the leg body is not limited to this configuration as long as the support frame 50 extending in the left-right direction is supported by the legs 30 and 40.

For example, as shown in FIG. 9, the support frame 50, the shaft body 210 extending downward from the lower side of the support frame 50, and the legs 30 and 40 rotatably attached to the shaft body 210, respectively. It is conceivable that each leg 31, 41, 33, 43 constitutes a leg body. In this configuration, if a cylindrical body 220 that can rotate around the shaft body 210 is provided, and legs 31, 41, 33, 43 are provided so as to extend in different directions from the outer peripheral surface of the tubular body 220. good. However, the legs 30 and 40 are formed so that the left and right distances are wider on the rear legs 33 and 43 sides than on the front legs 31 and 41 sides, and the rear legs 33 and 43 are located higher than the front legs 31 and 41. It is provided so that chairs 1 having the same shape can be stacked in the front-rear direction.

Even with such a leg chair 2, by flipping up the seat 20 so that the seating surface of the seat 20 intersects the ground, as shown in FIG. 10, this is moved in the front-rear direction. It can be stacked and the storage space when not in use can be reduced.
(3) Actions and effects With the chair 1 configured in this way, the chair 1 is seated on the seat 20 even though it adopts a structure in which a load is received by the support frame 50 arranged directly under the seat 20. Even if the seat-shaped member 23 is deformed, the lower end thereof does not come into contact with the support frame 50, and the deformation of the seat-shaped member 23 due to seating is not hindered. Therefore, it is possible to suitably improve the sitting comfort as the chair 1 while ensuring the compactness in the nesting state by the above structure.

Further, in the chair 1 as described above, the anterior-posterior position corresponding to the ischial tuberosity of the seated person, that is, the position along the anterior-posterior direction in which the ischial tuberosity of the seated person is assumed to be located is the position of the center of gravity in the anterior-posterior direction of the seated person. Therefore, at least the back surface of the frame 21 in the seat 20 so that the load can be received in the region b extending back and forth with this position as the reference position a ensures the strength when seated as the chair 1. It is effective to do. In this respect, in the above configuration, since the positioning member 100 can receive the load in the region b that can be the position of the center of gravity of the seated person in the seat body 20, it is possible to suitably secure the strength of the chair 1 when seated. can.

Further, when the positioning member 100 is composed of a set of the projecting piece 101 and the connecting piece 103, the frame-shaped structure can easily cause elastic deformation, so that the size exceeds the load in the seated state. By designing it to be elastically deformed only by the load of, it is possible to have a function of absorbing a large load generated at the time of sitting.

Further, in the above configuration, since the width of the positioning member 100 in the front-rear direction is narrowed toward the tip, the front-rear width of the region of the support frame 50 in contact with the positioning member 100 is also shortened in accordance with this front-rear width. This makes it possible to further improve the compactness during nesting.

Further, in the above configuration, by connecting each of the positioning members 100 with the reinforcing frame 105, the strength of the chair 1 when seated can be further improved.
Further, in the above configuration, since the positioning member 100 comes into contact with the support frame 50 at a position inside the left and right outer surfaces of the seat body 20, a certain distance is secured to this contact area, and as a result, the fingertips of the seated person It is possible to prevent the situation where such things are caught.

Further, in the case where the support frame 50 is provided with the inner regulation piece 55 and the outer regulation piece 57, the regulation pieces 55 and 57 of the support frame 50 are arranged in a region adjacent to the contact region with the positioning member 100, and both of them are arranged. Since the positional relationship is clear, the user can reliably and easily position the seat 20 in a seatable state.

Further, in the configuration in which the inner restricting piece 55 is formed, even if the positioning member 100 is displaced inward in the left-right direction due to the load at the time of sitting, this displacement is regulated by the inner restricting piece 55, so that the chair It is possible to further improve the strength at the time of sitting as 1.

Further, in the configuration in which the outer restricting piece 57 is formed, even when a large load is applied such as when seated and the positioning member 100 is displaced outward in the left-right direction, this displacement is regulated by the outer restricting piece 57. It is possible to prevent unintended deformation due to such a load.

Further, if the positioning member 100 is provided with the extension area 120 and the width in the front-rear direction including the extension area 120 is narrowed toward the tip, the front end including the extension area 120 of the positioning member 100 is provided. The side is in a state of supporting and reinforcing each of the left and right ends of the seat 20 from the back surface, which not only improves the strength of the seat 20 but also acts so that the seat 20 gradually bends toward its front end. Therefore, the deformation of the seat body 20 due to the contact of the seated person's legs (particularly the back side of the thigh) is less likely to be hindered, and as a result, the sitting comfort as the chair 1 can be improved.

1 ... chair, 10 ... backrest, 11 ... strip-shaped piece, 13 ... back side connecting piece, 15 ... shaft body, 20 ... seat body, 21 ... frame body, 21a ... front side frame body, 21b ... back side frame body, 23 ... sheet Shape member, 25 ... Seat side fixing piece, 30 ... Leg, 31 ... Front leg, 33 ... Rear leg, 35 ... Caster, 40 ... Leg, 41 ... Front leg, 43 ... Rear leg, 45 ... Caster, 50 ... Support frame , 51 ... Frame body, 53 ... Support side connecting piece, 55 ... Inner regulation piece, 57 ... Outer regulation piece, 100 ... Positioning member, 101 ... Projection piece, 103 ... Connection piece, 105 ... Reinforcing frame, 107 ... Convex part, 109 ... Positioning hole, 120 ... Extension area, 210 ... Shaft body, 220 ... Cylindrical body.

Claims (1)

A leg body that supports the support frame extending in the left-right direction by the legs,
A seat-like member that serves as a seating surface is attached to an area surrounded by the frame, and is provided with a seat that is rotatably fixed around an axis extending in the left-right direction on the rear side of the frame. Ori,
Of the frame body of the seat body, the back surface of each of the left and right pieces extending back and forth on the left and right sides protrudes from the back surface and comes into contact with the support frame so that the seat body can be seated. A pair of positioning members for positioning are provided, and
The positioning member has a positional relationship in which the lower end of the seat-shaped member is in contact with the support frame in a state of being above the upper end of the support frame when the seat-shaped member is deformed by sitting on the seat. A chair characterized in that the amount of protrusion from the back surface of the frame is defined so as to be.

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