JP4557408B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair that uses tension of a tension fabric instead of a cushion.
[0002]
[Prior art]
Conventionally, as chairs used in schools, offices, etc., front and rear leg frames formed of metal round pipe members, and seats that are supported by these front and rear leg frames so that their front and rear ends can be rotated in forward and reverse directions. And is configured to be folded from a use state into a folded state in which the front and rear leg frames are substantially flush with each other by relative rotation of the front and rear leg frames and seats.
[0003]
In this type of folding chair, the seat body attached to the seating position is usually constituted by a cushion member covered with a cover, and the lower surface of the seat body is supported by a seat receiving portion having a rectangular shape in plan view. I am doing so. This seat receiving part is comprised by the round pipe member similarly to the said front-and-back leg frame.
[0004]
[Problems to be solved by the invention]
By the way, in recent years, there is a chair that is attached to the opening formed by the seat receiving portion in a stretched state and uses the tension instead of the cushion.
[0005]
Also in the field of the folding chair described above, it is conceivable to construct a seat by stretching a stretch fabric over an opening formed by a seat receiving portion in order to reduce the weight of the chair or improve the design. When the tension of the tension fabric is used instead of the cushion, the larger the separation distance between the seat receiving portions that support both edges of the tension fabric, the greater the bending width, and the cushioning property can be improved. It becomes possible. However, the round pipe member constituting the conventional seat receiving portion has a smaller distance between the front and rear leg frames to improve the appearance, and prevents interference between the front and rear leg frames and the seat receiving portion in the folded state. For this reason, it must be positioned on the inner side of the front and rear leg frames, and it is difficult to ensure a larger width dimension of the seating surface.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention comprises a seat and first and second leg frames that support the seat in a pair in the width direction. In the chair provided so that the second leg frame is displaced in the width direction, the first leg frame supports the one end side of the seat so as to be rotatable in forward and reverse directions, and the second leg frame. A leg frame is connected to the first leg frame so as to be rotatable in forward and reverse directions, and supports the other end portion of the seat so as to be rotatable in forward and reverse directions. The second leg frame is configured to be folded from a use state into a folded state in which the first and second leg frames are substantially flush with each other by relative rotation of the seat, and the seat has at least a seat width. Tension ground between the tension ground mounting parts arranged in pairs on both sides in the direction And which is formed of mounting in a state of taut, a body in which the coated cloth mounting section is opened in the rear has a wall serving as left and right side walls having a surface portion which extends substantially along the thickness direction of at least the seat of the body And a rear wall body attached to the upper surface on the rear end side. The main body is positioned between the first and second leg frames, and the rear wall body extends in the seat width direction. And the left and right ends of the thin plate-like member, and the left and right ends of the thin plate-like member. The first or second leg frame is formed by relatively twisting the surface portions so that the surface portion constituting the portion and the surface portion constituting the center portion are substantially orthogonal to each other, and disposed between the left and right side walls in the folded state. Is located below the left and right ends of the rear wall I have to so that.
[0007]
In the case of a seat where the tension is attached to the tension attachment part as described above and the tension is used instead of the cushion, the distance between the pair of tension attachment parts to which both edges of the tension element are attached is made. It is desirable to improve the cushioning property by increasing the distance and giving a larger deflection width to the stretched fabric. According to the configuration of the present invention, since the tension ground attachment part can be interposed between the first and second leg frames, the seat which is the tension ground attachment part on the inner side of both leg frames due to its structure. Compared to the conventional one provided with the receiving portion, the seat width dimension can be secured larger. Therefore, it becomes possible to give a large deflection width to the stretch fabric and improve the cushioning property.
[0008]
The first leg frame supports one end of the seat so as to be rotatable in forward and reverse directions, and the second leg frame is connected to the first leg frame so as to be rotatable in forward and reverse directions. And the other end side of the seat is rotatably supported in the forward and reverse directions, and the first and second leg frames, the second leg frame, and the seat are moved from the use state by relative rotation of the first leg frame, the second leg frame, and the seat. Since the two leg frames are configured to be folded in a substantially flush state, the above-described tensioning seat and the tensioning portion attaching portion can be used for a folding chair that is often folded and carried. Weight reduction can be achieved.
[0009]
In order to improve the strength of the upholstery mounting portion and to support stable support of the upholstery portion, the upholstery mounting portion includes an opposing wall body that faces the wall body, and the wall body and the opposing wall body. It is desirable to have a substantially U-shaped cross section composed of a horizontal wall provided along the width direction of the seat so as to be connected.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0011]
As shown in FIG. 1, the folding chair 1 of the present embodiment includes a front leg frame 2 as a first leg frame that supports a rear end portion side of a seat 4 so as to be rotatable in a forward and reverse direction via a first shaft 1a. A second leg frame that is rotatably attached to the inside of the front leg frame 2 via a third shaft 1c and supports the front end portion side of the seat 4 so as to be rotatable in the forward and reverse directions via the second shaft 1b. The front leg frame 2, the rear leg frame 3, and the seat 4 are respectively forward and reverse through the first shaft 1a, the second shaft 1b, and the third shaft 1c. The front leg frame 2 and the rear leg frame 3 are substantially connected at a position where the inner side surface of the front leg frame 2 and the outer side surface of the rear leg frame 3 face each other from the use state P indicated by the solid line in FIG. It can be folded to the folded state Q shown in the imaginary line in FIG. It is those that form. In the folded state Q, the folding chair 1 can be stacked up and down with the front side facing down together with other folding chairs 1 having the same shape as shown in FIG.
[0012]
The front leg frame 2 has a substantially U shape made of a steel round pipe and has a backrest 21 on the upper end side.
[0013]
The rear leg frame 3 is substantially U-shaped made of a steel round pipe. The rear leg frame 3 intersects the inside of the front leg frame 2 so as to form an X shape in a side view and is connected to the front leg frame 2 via a third shaft 1c. They are connected so as to be relatively rotatable. In the present embodiment, the rotary support 5 having the third shaft 1c for rotatably supporting the rear leg frame 3 with respect to the front leg frame 2 is attached to the outside of the rear leg frame 3 so as to be slidable. Accordingly, the rotation of the rear leg frame 3 and the seat 4 and the rotation of the front leg frame 2 and the rear leg frame 3 that occur when the seat 4 and the front and rear leg frames 2 and 3 are rotated between the use state P and the folded state Q. The displacement between the center is absorbed.
[0014]
As shown in FIG. 2, the seat 4 has a seat receiving portion 6 as an upholstery attachment portion having a substantially square shape in plan view and having an opening at the center, and is stretched in the opening of the seat receiving portion 6. The upholstery 7 to be attached and the seat frame portion 8 made of a synthetic resin in a substantially square shape in plan view covering the outer periphery of the seat receiving portion 6 to which the upholstery 7 is attached are provided. In FIG. 5, the upholstery 7 and the seat frame 8 are omitted. The upholstery 7 is made of a net material, and the edge thereof is wound around the seat receiving portion 6 and attached using a fitting such as a screw, or is fixed to the seat receiving portion 6 by thermal welding. It is attached in an appropriately tensioned state by appropriate means such as these.
[0015]
As shown in FIG. 2, the seat receiving portion 6 includes a seat receiving portion main body 61 formed by bending a thin plate-like member having a surface portion substantially along the thickness direction of the seat 4 into a substantially U shape, and a width direction of the seat 4. A horizontal wall body 62 formed by bending a thin plate-like member having a substantially along surface portion into a substantially U shape and attached to the upper surface of the seat receiving portion main body 61 by an appropriate means, and the rear end side of the seat receiving portion main body 61 And a rear wall body 63 attached thereto. The rear wall 63 is attached to the upper surface on the rear end side of the seat receiving portion main body 61 using an appropriate means such as welding, and has left and right end portions having surface portions substantially along the width direction of the seat 4. 631 and a central portion 632 having a surface portion substantially along the thickness direction of the seat 4. The rear wall 63 is formed by relatively twisting the surface portions so that the surface portion constituting the left and right end portions 631 of the thin plate member and the surface portion constituting the central portion 632 are substantially orthogonal to each other. In this way, by making the left and right end portions 631 a surface portion substantially along the width direction, it is possible to prevent interference with the rear leg frame 3 in the folded state Q without losing strength as compared with the case where notches are provided. By making the central portion 632 a surface portion substantially along the thickness direction, it is possible to prevent bending due to a load.
[0016]
When the seat 4 is configured by using the seat receiving portion 6, the upholstery 7, and the seat frame portion 8 having the above-described configuration, an edge of the upholstery 7 is wound around the seat receiving portion 6 and a screw or the like. It is attached in a state where it is appropriately tensioned by an appropriate means such as attaching to the seat receiving part 6 by heat welding, and then the seat frame part 8 is attached from above. Cover the outer periphery of the seat 4 and fix it with appropriate means such as screws.
[0017]
In such a configuration, the seat 4 of the folding chair 1 according to the present embodiment is attached in a state where the edge of the upholstery 7 is stretched in the opening formed in the seat receiving portion 6 as described above. The tension of the upholstery 7 is used instead of the cushion. As shown in FIGS. 5 and 6, the seat receiving portion main body 61 includes left and right side walls 611 as wall bodies along the thickness direction of the seat 4, and the left and right side walls 611 are connected to the front leg frame 2 and the rear side. It is located between the leg frames 3.
[0018]
More specifically, the seat receiving portion main body 61 has a pair of left and right thin plate-like left and right side walls 611 having a surface portion substantially along the thickness direction of the seat 4, and the thickness direction of the seat 4 connecting the left and right side walls 611. And a front wall 612 having a substantially along surface portion. The left and right side walls 611 are positioned between the front leg frame 2 and the rear leg frame 3.
[0019]
In this way, in the case of the seat 4 in which the upholstery 7 is attached to the seat receiving portion 6 and the tension is used instead of the cushion, between the opposite seat receiving portion elements to which both edges of the upholstery 7 are attached. It is desirable to increase the separation distance so that the cushioning property is improved by providing a larger bending width to the tensioned fabric 7. In particular, in the folding chair 1 of this type, the front and rear leg frames 2 and 3 that make a pair in the width direction of the seat 4 exist, and therefore it is difficult to ensure a larger width dimension. However, in the case of the configuration of the present embodiment as described above, the left and right side walls 611 of the seat receiving portion 6 constituting the left and right edge portions of the seat 4 are interposed between the front and rear leg frames 2 and 3, so The width dimension of the seat 4 can be ensured larger than the conventional one in which the left and right edge portions of the seat receiving portion are provided on the inner sides of the seats 2 and 3. Therefore, it becomes possible to give a large bending width to the stretch 7 and improve the cushioning property of the seat 4.
[0020]
The front leg frame 2 supports the front end portion of the seat 4 so as to be rotatable in forward and reverse directions, and the rear leg frame 3 is connected to the front leg frame 2 so as to be rotatable in forward and reverse directions and The rear end side is supported so as to be rotatable in forward and reverse directions, and the front and rear leg frames 2 and 3 are substantially flush from the use state P by relative rotation of the front leg frame 2, rear leg frame 3 and seat 4. Since it is configured to be folded in the folded state Q, the use of the folding chair 1 that reduces the overall weight of the chair by using the above-described tension place 7 and the seat receiving portion 6, and has many opportunities to fold and carry the chair. Can be made good.
[0021]
Of course, the configuration of the present invention is not limited to the above-described configuration. For example, in the present embodiment, the seat receiving portion 6 has the left and right side walls 611 positioned between the front leg frame 2 and the rear leg frame 3, but the present invention is not limited to this. The cross section is generally formed by a lateral cross section composed of inner left and right side walls positioned opposite to the left and right side walls, and a top wall provided along the width direction of the seat so as to connect the left and right side walls and the inner left and right side walls. It may have a letter shape. With such a configuration, the strength of the seat receiving part that receives the load of the seated person can be improved by making the cross-sectional shape of the seat receiving part substantially U-shaped. In addition, the presence of the top wall can secure a larger support area for supporting the load applied to the tensioned fabric by the seat receiving portion, and therefore it is possible to effectively prevent breakage due to excessive force applied to the tensioned fabric. it can.
[0022]
Other configurations can be variously modified without departing from the spirit of the present invention.
[0023]
【The invention's effect】
The present invention is implemented with the configuration as described above, and has the following effects.
[0024]
That is, the present invention is configured such that the seat is attached in a state where the edge of the tension fabric is stretched between the tension fabric attachment portions arranged at least in the width direction of the seat, A main body having left and right side walls which are wall bodies having surface portions extending substantially along the thickness direction of the seat, and a rear wall body attached to the upper surface on the rear end side of the main body. Is positioned between the first and second leg frames , and the rear wall body has left and right end portions having surface portions along the width direction of the seat, so that the inner side of both leg frames Compared to the conventional one in which the seat receiving portion which is the tension attachment portion is provided, the width of the seat can be secured larger. Therefore, when the seating surface is formed with a stretched fabric, the stretched fabric can have a large bending width, and the cushioning property of the seat can be improved.
[0025]
The first leg frame supports one end of the seat so as to be rotatable in forward and reverse directions, and the second leg frame is connected to the first leg frame so as to be rotatable in forward and reverse directions. And the other end side of the seat is rotatably supported in the forward and reverse directions, and the first and second leg frames, the second leg frame, and the seat are moved from the use state by relative rotation of the first leg frame, the second leg frame, and the seat. Since the two leg frames are configured to be folded in a substantially flush state, the above-described tensioning seat and the tensioning portion attaching portion can be used for a folding chair that is often folded and carried. Weight reduction can be achieved.
[0026]
The upholstery mounting portion is configured by an opposing wall body that faces the wall body, and a horizontal wall body that is provided along the width direction of the seat so as to connect the wall body and the opposing wall body. If the cross section has a substantially U-shape, the strength of the upholstery attachment portion that receives the load of the seated person can be made substantially U-shaped to improve its strength. In addition, since the support area for supporting the load applied to the tensioned fabric by the horizontal wall body can be secured larger, it is possible to effectively prevent breakage due to excessive force applied to the tensioned fabric. .
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the same.
FIG. 3 is a side view showing a use state and a folded state of the chair.
FIG. 4 is a side view showing a state in which a plurality of chairs are stacked in the same folded state.
FIG. 5 is a perspective view showing a state in which the main part is viewed from below.
FIG. 6 is a front sectional view of the same.
[Explanation of symbols]
1 ... Folding chair 2 ... First leg frame (front leg frame)
3. Second leg frame (rear leg frame)
4 ... Seat 6 ... Seat receiving portion 611 ... Wall body (left and right side walls)
7 ... Zhangji P ... State of use Q ... Folded state

Claims (2)

A seat and first and second leg frames that support the seat in a pair in the width direction are disposed, and the first and second leg frames are positioned by being displaced in the width direction. In the chair provided as
A first leg frame supports one end of the seat so as to be rotatable in forward and reverse directions, and the second leg frame is connected to the first leg frame so as to be rotatable in forward and reverse directions. The other end of the seat is supported so as to be rotatable in forward and reverse directions. The first and second leg frames, the second leg frame, and the seat are rotated relative to each other from the use state. The leg frame is configured to be folded in a substantially flush state,
The seat is configured to be attached in a state in which a tension is stretched between at least two tension-strength attachment portions arranged on both sides in the width direction of the seat, and the tension fabric attachment portion is at least in the thickness direction of the seat. A main body having left and right side walls as a wall body having a surface portion extending substantially along the rear side, and a rear wall body attached to an upper surface on the rear end side of the main body. The left and right end portions positioned between the first and second leg frames, the rear wall body having a surface portion along the width direction of the seat, and the whole is positioned above the upper ends of the left and right side walls of the main body. A central portion having a surface portion substantially along the thickness direction of the seat, and the surface portions are relatively arranged so that the surface portion constituting the left and right end portions of the thin plate member and the surface portion constituting the center portion are substantially orthogonal to each other. To the left in the folded state Chair, characterized in that the first or second leg frame arranged between the side walls are to be positioned below the right and left ends of the rear wall. The tension wall attaching portion includes a facing wall body facing the wall body, and a horizontal wall body having a surface portion extending substantially along the width direction of the seat so as to connect the wall body and the facing wall body. The chair according to claim 1, wherein the chair has a substantially U-shaped cross section.

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