JP7240024B2 - chair - Google Patents

Description

The present invention relates to a chair having legs and a seat.

2. Description of the Related Art Conventionally, as a chair used in a hall or the like, in order to reduce the storage space when not in use, there is known a so-called nesting structure in which the seat body is flipped up and stacked in the front-rear direction. ing.

In this type of chair, not only can it be stored compactly in a nested state, but also enough strength as a chair can be ensured. It is common to do (Patent Document 1,
2).

Japanese Patent Application Laid-Open No. 2005-279032 Japanese Patent Application Laid-Open No. 2005-218534

In recent years, in addition to the above-described nestable chair, efforts have been made to improve the sitting comfort of the chair by, for example, using a seat body in which a sheet-like member is stretched over a frame body. The prior art cannot directly meet such demands.

This is because, in order to maintain compactness, the load is received by the frame placed directly under the seat. This is because further deformation is hindered, and the comfort of sitting becomes worse.

The present invention has been made to solve such problems, and its object is to improve the sitting comfort as a chair without reducing the compactness in the nested state in a chair configured to be nestable. It is to let

In order to solve the above problems, the first configuration is composed of legs formed by supporting a support frame extending in the left-right direction by legs, and a sheet-like member that serves as a seating surface is stretched on an area surrounded by the frame. and a seat body fixed rotatably about 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 in the front-rear direction on the left and right sides. and a pair of positioning members protruding from the back surface of each of the right and left pieces and coming into contact with the support frame to position the seat body so that the seat can be seated. The frame is arranged such that the lower end of the sheet-like member is positioned above the upper end of the support frame and contacts the support frame when the sheet-like member is deformed when the user sits on the seat. The amount of protrusion from the back of the body is determined.

In the chair constructed in this way, even if the seat-like member is deformed by sitting on the seat, despite the fact that the support frame arranged directly under the seat is designed to receive the load, The lower end does not come into contact with the support frame, and the deformation of the sheet-like member accompanying seating is not hindered. Therefore, it is possible to preferably 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 front-rear position corresponding to the ischial tuberosity of the seated person, that is, the position along the front-rear direction where the ischial tuberosities of the seated person are supposed to be located, can be the position of the center of gravity of the seated person in the front-rear direction. It is effective to ensure the strength of the chair when the chair is seated, at least in the area of the back surface of the frame of the seat that extends forward and backward with this position as the reference position.

For this purpose, it is conceivable to change the above configuration to a second configuration or a third configuration described below.
In the second configuration, the positioning member includes a pair of protruding pieces protruding from 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, and the pair of protrusions. and a connecting piece that connects the pieces at their tip sides, and positions the seat body by contacting the connecting piece with the support frame.

In the third configuration, the positioning member is formed as a plate-shaped protrusion that protrudes over a predetermined area extending in the front-rear direction, including the reference position, on the back surface of the frame.
With the chair according to these configurations, the positioning member can receive a load in a region of the seat body that can be the center of gravity of the seated person.

In particular, as in the second configuration, when the positioning member is composed of a pair of protruding pieces and connecting pieces, elastic deformation can easily occur due to this frame-like structure. By designing it so that it elastically deforms only with a load exceeding the load at , it is possible to have a function of absorbing a large load that occurs when the seat is seated.

Further, it is conceivable that these configurations are the fourth configuration described 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 area with the positioning member, and in a side view, The front end of the positioning member reaches a position overlapping a line extending along the front end face of the positioning member.

In the chair constructed in this manner, the width of the positioning member in the front-rear direction narrows toward the tip, so that the front-rear width of the region of the support frame that contacts the positioning member is also shortened in accordance with this front-rear width. It is possible to further improve the compactness at the time of nesting.

Moreover, each of the above configurations may be configured as a fifth configuration described below.
In the fifth configuration, the positioning member has an extension region extending forward in a side view, and the width in the front-rear direction including the extension region is shaped so as to narrow toward the distal end.

With the chair constructed in this manner, the front end side including the extension region of the positioning member supports and reinforces the left and right ends of the seat body from the back surface, and the strength of the seat body can be improved. As the front end of the seat body gradually bends more easily, the deformation of the seat body due to contact with the legs (especially the back side of the thigh) is less likely to be hindered. It is possible to improve sitting comfort.

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

In the chair constructed in this manner, the strength of the chair when the chair is seated can be further improved by connecting the positioning members with the reinforcing frame.
Further, each of the above configurations may be the seventh and eighth configurations described below.

In the seventh configuration, the support frame has an inner restricting piece formed in an area adjacent to a contact area with the positioning member for restricting the positioning member from being displaced inward in the left-right direction.

In the eighth configuration, the support frame is formed with an outer restricting piece that restricts lateral displacement of the positioning member in a region adjacent to a contact region with the positioning member.

In the chair according to these configurations, the regulation piece of the support frame is arranged 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 the desired state can be performed reliably and easily.

In addition, in the configuration in which the inner restricting pieces are formed, even if the positioning member is displaced inward in the left-right direction due to the load when the user is seated, the displacement is restricted by the inner restricting pieces, so that the user can sit as a chair. The strength of time can be further improved.

In addition, in the configuration in which the outer restricting pieces are formed, even if the positioning member is displaced laterally outward due to the application of a large load such as when the user is seated, the displacement is restricted by the outer restricting pieces. Unintended deformation due to load can be prevented.

Further, each of the above configurations may be replaced with a ninth configuration described below.
In the ninth configuration, the positioning member protrudes from the back surface of the seat body so as to incline inward in the left-right direction, and contacts the support frame at a position inside the left and right outer side surfaces of the seat body. is configured to

In the chair constructed in this manner, the positioning member contacts the support frame at a position inside the left and right outer surfaces of the seat body. Therefore, it is possible to prevent a situation in which a fingertip or the like is caught.

Six views showing the overall structure of the chair (left side view omitted) AA sectional view in the front view Perspective view showing the characteristic part of the chair The perspective view which shows the characteristic part of the chair in another embodiment. Diagram showing multiple chairs in a nested state The perspective view which shows the characteristic part of the chair in another embodiment. Principal part front view showing a characteristic part of a chair in another embodiment FIG. 10 is a right side view of a main portion showing a frame of a seat body in another embodiment; Front view and right side view showing the overall configuration of a chair in another embodiment A diagram showing how a plurality of chairs are placed in a nested state according to another embodiment.

Embodiments for carrying out the present invention will be described below with reference to the drawings.
(1) Configuration As shown in FIG.
0 and a support frame 50 extending in the left-right direction, and the same chair 1 can be stacked in the front-rear direction and stored (so-called nesting).

The backrest 10 has a plate-like member formed in an arcuate shape that protrudes rearward in a plan view, so that the shape as a whole follows the back of the seated person. and a pair of dorsal connecting pieces 13 extending downward from the lower ends of the left and right sides and connected to the support frame 50 .

Among these, the strip-shaped piece 11 is composed of portions extending rearward from the left and right ends of the upper end of the backrest 10 and strip-shaped portions connecting the respective portions in the left-right direction. A horizontally long space surrounded by the strip 11 is formed. A strip-shaped portion of the strip-shaped piece 11 is used as a handle when the chair 1 is moved. Note that the strip-shaped piece 11 is not limited to this configuration, and as shown in FIG. 4(a), it may be composed only of a strip-shaped portion, and may have a configuration in which a horizontally long space is not formed.

Also, the pair of back side connecting pieces 13 are arranged in a positional relationship to sandwich the rear end side of the seat body 20 from the left and right, and as shown in FIG. It is rotatably fixed as As a result, the seat body 20 is flipped up so that the seat body 20 is laid down so that the seating surface becomes a plane along the ground (Fig. 3(a)), and the seat body 20 is flipped up so that the seating surface becomes a plane that intersects the ground. It is rotatable between the housed state (FIG. 3(b)) and the state shown in FIG.

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

The seat body 20 is formed by putting a sheet-like member 23 as a seating surface on a region surrounded by a square frame body 21 in a plan view. In this embodiment, as shown in FIG. 2, the frame body 21 is formed by stacking a front frame body 21a and a back frame body 21b in the front and back directions, and a sheet-like member 23 is stretched over the front frame body 21a. A positioning member 100, which will be described later, is provided on the body 21b. The seat body 20 has an upward slope from the rear end to the front end (see the right side view), and the front end is a hanging piece that hangs downward.

The seat body 20 has a pair of seat-side fixings for fixing the seat body 20 to the backrest 10 at positions corresponding to the pair of back-side connecting pieces 13 of the backrest 10 (both left and right sides on the rear end side). A piece 25 is provided, through which the above-described shaft 15 is passed and fixed so that the entire seat body 20 can be rotated with respect to the backrest 10 (see FIGS. 3(a) and 3(b)).

A pair of positioning members 100 for positioning the seat body 20 so that the seat body 20 can be seated are provided on the back surfaces of the left and right pieces extending forward and backward on the left and right sides of the frame body 21 of the seat body 20. ing.

The positioning member 100 protrudes from the rear surface of the seat body 20, and in this embodiment has a shape (trapezoidal shape in this embodiment) in which the width in the front-rear direction narrows toward the tip when viewed from the side. The amount of protrusion from the seat body 20 is such that when the seat body 20 is seated and the sheet-shaped member 23 is deformed, the lower end of the sheet-shaped member 23 contacts the support frame 50 in a state above the upper end of the support frame 50 . It is determined to have a positional relationship that In this embodiment, the positioning member 100 protrudes from the back surface of the seat body 20 so as to incline inward in the left-right direction, and is located inward of the left and right outer surfaces of the seat body 20. contact (see front view in FIG. 1).

Here, as shown in FIG. 2, it is assumed that the front-rear position corresponding to the ischial tuberosities of the seat 20 (that is, the position along the front-rear direction where the ischial tuberosities of the seated person are assumed to be located) is the reference position a. Then, the positioning member 100 has a pair of protruding pieces 101 protruding from the front and rear ends of a predetermined area b extending in the front-rear direction including the reference position a on the back surface of the frame 21, and the protruding pieces 101 at the respective ends. and a connecting piece 103 that connects on the side, and the seat body 20 is positioned by the connecting piece 103 coming into contact with the support frame 50 . Here, the positioning member 100 is not limited to the configuration consisting of a set of the protruding piece 101 and the connecting piece 103. For example, as shown in FIG. It may be formed as a protrusion projecting over the

Further, as shown in FIG. 3B, each of the positioning members 100 is connected by a reinforcing frame 105 extending in the left-right direction from one end (connection piece 103) to the other end (connection piece 103). The reinforcing frame 105 has a configuration in which the positioning members 100 are connected only at the front and rear ends thereof, but is not limited to this configuration. As shown in FIG. The tip of the member 100 may be connected over the entire front-to-rear width, or may not be provided as shown in FIG. 6(b).

In the present embodiment, each of the positioning members 100 is subjected to a static strength test or impact resistance test defined in the JIS standard (S1203) regarding testing methods for chair strength and durability. A height determined so that the lower end of the sheet-like member 23 deformed by the load does not contact at least the upper surface of the support frame 50 (specifically, 50 mm as the height corresponding to the magnitude of the load and the elasticity of the sheet-like member 23) is ensured. If the lower end of the seat body 20 does not come into contact with the upper surface of the support frame 50 under this load, even if the seat member 23 is deformed by sitting on the seat body 20 when a seated person below the load is seated, The lower end of the sheet-like member 23 does not come into contact with the upper end of the support frame 50. - 特許庁

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

The legs 30 and 40 are formed so that the distance between the legs 30 and 40 is wider on the side of the rear legs 33 and 43 than on the side of the front legs 31 and 41, so that chairs 1 having the same shape can be stacked in the front-rear direction. Configure.

The support frame 50 includes a plate-like frame main body 51 extending in the left-right direction, a pair of support-side connecting pieces 53 extending upward from upper portions of the left-right direction end sides of the frame main body 51 and connected to the backrest 10, In this 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 as a member is a contact area with the positioning member 100, and the front end surface of the positioning member 100 overlaps a line extending along the front end surface in a side view. , the front end as a member has reached.

The front end of the frame main body 51 has a downwardly inclined curved surface (in this embodiment, a semicircular shape when viewed from the side), so that the convex portion 107 formed at the tip of the positioning member 100 is fitted therein. It is configured.

The chair 1 configured as described above can be stacked in the front-rear direction as shown in FIG. As a result, 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 can take various forms as long as they fall within the technical scope of the present invention. Needless to say.

For example, in the above-described embodiment, the frame main body 51 of the support frame 50 has a plate shape extending in the left-right direction. However, the frame main body 51 is not limited to this configuration, and for example, as shown in FIG. 6, a columnar body extending in the horizontal direction may be employed.

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

In the above embodiment, the contact area between the support frame 50 and the positioning member 100 may be configured as follows from the viewpoint of positioning the seat body 20 and ensuring the strength of the chair 1 . Specifically, as shown in FIG. 7, an inner restricting piece 55 for restricting laterally inward displacement of the positioning member 100 is provided in a region of the support frame 50 adjacent to a contact region with the positioning member 100. Alternatively, an outer restricting piece 57 for restricting the lateral displacement of the positioning member 100 is provided.

Here, projections are formed on the support frame 50 side, and the laterally outer sides of the protrusions function as inner restricting pieces 55 and the laterally inner sides thereof function as outer restricting pieces 57 . , 57 are formed with positioning holes 109 so as to come into contact with the support frame 50. As shown in FIG. However, the inner regulating piece 55 and the outer regulating piece 57 may be formed as separate members, or the regulating pieces 55 and 57 may be arranged outside and inside the positioning member 100 in the left-right direction. may be

Further, in the above-described 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 when viewed from the side 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 when viewed from the side. Specifically, as shown in FIG. 8, it has an extension region 120 that extends forward in a side view, and the width in the front-rear direction including the extension region 120 narrows toward the distal end (vertical direction). It is conceivable to use a shape in which the thickness decreases toward the front. The extension region 12 may extend from the front end face of the positioning member 100 main body to a region where the seat body 20 begins to hang downward.

In the above-described embodiment, the pair of left and right legs 30 and 40 and the support frame 50 connecting the legs 30 and 40 in the left-right direction support the legs 30 and 40 on the support frame 50. was configured. However, the legs are 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, a support frame 50, a shaft 210 extending downward from the support frame 50, and legs 30 and 40 rotatably attached to the shaft 210, respectively. It is conceivable that each leg 31, 41, 33, 43 constitutes a leg body. In this configuration, a cylindrical body 220 rotatable around a shaft 210 is provided, and legs 31, 41, 33, and 43 are provided so as to extend in different directions from the outer peripheral surface of this cylindrical body 220. good. However, the leg portions 30 and 40 are formed such that the left and right intervals are wider on the rear legs 33 and 43 side than on the front legs 31 and 41 side, and the rear legs 33 and 43 are positioned higher than the front legs 31 and 41. This structure allows chairs 1 having the same shape to be stacked in the front-rear direction.

Even with such a legged chair 2, by flipping up the seat body 20 so that the seating surface of the seat body 20 becomes a plane that intersects with the ground, as shown in FIG. It becomes a state in which it can be stacked, and the storage space when not in use can be reduced.
(3) Actions and Effects With the chair 1 configured as described above, even though the support frame 50 arranged directly under the seat body 20 has adopted a structure that receives the load, the seat body 20 can be sat on. Even if the sheet-like member 23 is deformed in , the lower end of the sheet-like member 23 does not come into contact with the support frame 50, and the deformation of the sheet-like member 23 accompanying the seating is not hindered. Therefore, the sitting comfort of the chair 1 can be preferably improved while ensuring compactness in the nesting state by the structure described above.

Further, in the chair 1 configured as described above, the front-rear position corresponding to the ischial tuberosity of the sitter, that is, the position along the front-rear direction where the sciatic tuberosities of the sitter are assumed to be positioned is the center of gravity of the seated person in the front-rear direction. Therefore, at least the back surface of the frame 21 of the seat 20 should be able to receive the load in the region b extending forward and backward with this position as the reference position a to ensure the strength of the chair 1 when seated. effective for In this respect, in this configuration, the positioning member 100 allows the load to be received in the area b of the seat body 20, which can be the center of gravity of the seated person. can.

In addition, when the positioning member 100 is composed of a pair of the protruding piece 101 and the connecting piece 103, the frame-like structure can easily cause elastic deformation. By designing it to elastically deform only with a load of , it is possible to have a function of absorbing a large load that occurs when a person is seated.

In addition, 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 that contacts the positioning member 100 should also be shortened in accordance with this front-rear width. It is possible to further improve the compactness at the time of nesting.

In addition, in the above configuration, by connecting the positioning members 100 with the reinforcing frames 105, the strength of the chair 1 when the person is seated can be further improved.
In addition, in the above configuration, the positioning member 100 contacts the support frame 50 at a position inside the left and right outer surfaces of the seat body 20. As a result, a certain distance is ensured to this contact area, and as a result, the fingertips of the seated person can be moved. It is possible to prevent a situation in which a foreign object or the like is caught.

In addition, if the supporting frame 50 is provided with the inner restricting piece 55 and the outer restricting piece 57, the restricting pieces 55 and 57 of the support frame 50 are arranged in the area adjacent to the contact area with the positioning member 100, thereby Since the positional relationship is clarified, it becomes possible for the user to reliably and easily position the seat body 20 so that it can be seated.

In addition, 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 when the seat is seated, this displacement is restricted by the inner restricting piece 55, so that the seat can be moved. It is possible to further improve the strength at the time of sitting as 1.

In addition, in the configuration in which the outer restricting piece 57 is formed, even when the positioning member 100 is displaced laterally outward due to a large load applied when the user is seated, the displacement is restricted by the outer restricting piece 57. Unintended deformation due to such loads can be prevented.

Further, if the positioning member 100 is provided with the extension region 120 and the width in the front-rear direction including the extension region 120 is narrowed toward the tip, the front end including the extension region 120 of the positioning member 100 can be formed. The side supports and reinforces the left and right ends of the seat body 20 from the rear surface, and not only can the strength of the seat body 20 be improved, but also the front end of the seat body 20 gradually bends more easily. Therefore, deformation of the seat body 20 due to contact with the legs (especially the back side of the thighs) of the seated person is less likely to be hindered.

DESCRIPTION OF SYMBOLS 1... Chair 10... Backrest 11... Strip piece 13... Back side connection piece 15... Shaft body 20... Seat body 21... Frame body 21a... Front side frame body 21b... Back side frame body 23... Seat Shaped 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 main body 53... Support side connecting piece 55... Inner restricting piece 57... Outer restricting piece 100... Positioning member 101... Protruding piece 103... Connecting piece 105... Reinforcing frame 107... Convex part 109... Positioning hole, 120... Extension region, 210... Shaft, 220... Cylindrical body.

Claims (4)

a leg formed by supporting a support frame extending in the left-right direction with the leg;
a seat body comprising a frame body and a sheet-like member that is stretched over the frame body and serves as a seating surface, and is configured to be rotatable about an axis extending in the left-right direction;
a positioning member provided on the side of the seat body opposite to the side of the seat body that serves as the seating surface, and positioned by being supported by the support frame to position the seat body in a seatable state;
The positioning member has one end extending from a left piece of the frame extending longitudinally on the left side, and the other end extending from a right piece extending longitudinally on the right side of the frame,
The sheet-shaped member is deformable,
The positioning member has a shape in which the width in the front-rear direction narrows downward, and the outer surface in the left-right direction protrudes from the frame so as to incline inward in the left-right direction. It is configured to contact the support frame at a position inside the left and right outer surfaces.
A chair characterized by: a leg formed by supporting a support frame extending in the left-right direction with the leg;
a seat body comprising a frame body and a sheet-like member that is stretched over the frame body and serves as a seating surface, and is configured to be rotatable about an axis extending in the left-right direction;
a positioning member provided on the side of the seat body opposite to the side of the seat body that serves as the seating surface, and positioned by being supported by the support frame to position the seat body in a seatable state;
The positioning member has one end extending from the left piece of the frame and the other end extending from the right piece of the frame,
The sheet-shaped member is deformable,
The positioning member has a shape in which the width in the front-rear direction narrows in the direction away from the seating surface, and the outer surface in the left-right direction projects from the frame so as to incline inward in the left-right direction, configured to contact the support frame at a position inside the left and right outer surfaces of the seat body
A chair characterized by: a leg formed by supporting a support frame extending in the left-right direction with the leg;
Equipped with a frame body that is rectangular in plan view and a sheet-like member that is deformable and is stretched over the frame body to serve as a seating surface, and is configured to be rotatable about an axis extending in the left-right direction. a seat body;
One end provided on the opposite side of the seat body to the side of the seating surface and having a length in the left-right direction and a width in the front-rear direction extends from the left piece of the frame body and has a width in the front-rear direction. a positioning member having the other end extending from the right piece of the frame body, the member being disposed at a position spaced apart from the sheet-like member and having a width in the front-rear direction larger than the width in the vertical direction; a positioning member that positions the seat body in a seatable state by being supported by the support frame;
A chair characterized by: a leg formed by supporting a support frame extending in the left-right direction with the leg;
a seat body comprising a frame body and a sheet-shaped member that is stretched over an area surrounded by the frame body on all four sides and serves as a seating surface, and is configured to be rotatable about an axis extending in the left-right direction;
It is provided on the opposite side of the seat body to the seating surface, has a length in the left-right direction, and has one end extending from the left piece of the frame body and the other end extending from the right piece of the frame body. The positioning member has a member arranged at a position spaced apart from the sheet-shaped member, and the member is supported by the support frame to position the seat body in a seatable state. a positioning member;
The sheet-shaped member is deformable,
The frame includes a front side member positioned relatively on the front side and a back side member positioned relatively on the back side,
The sheet member is provided on the member on the front side, and the positioning member is provided on the member on the back side integrally with the member on the back side.
A chair characterized by:

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