JP2003000400A - Body supporter such as chair and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a body supporter which has a strong net in a three- dimensionally curved shape spread on a backrest frame. SOLUTION: A thermoplastic caulking material 12 is filled and solidified in a ring shape groove 12 formed on the radial outer position of a frame 4 made of a synthetic resin. The edge part of a net 6 with elasticity to receive a human body is provisionally fused to a slope face 14 on the backside of the frame 4 over the recessed groove 12 from the projected surface side. The caulking material 15 is once fused by heating the frame 4 and the net 6 for a suitable time and then gradually cooled to give tension to form a three- dimensionally curved face to the net 6 to be fixed on the frame 4. A protecting frame 5 with an L-shape section is fixed to cover the backside of the frame 4 and the outer peripheral face on the radial outer side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body support device such as a chair.

[0002]

2. Description of the Related Art As one form of a chair, there is one in which a seat and a backrest have a structure in which a net-shaped seat is stretched over a frame such as a substantially rectangular frame, and this type of chair is generally a net chair (or net chair). )It is called.

FIG. 8 shows a conventional example of a means for fixing a net to a frame forming a seat of a chair. Among them, the example shown in FIG. 8A and disclosed in Japanese Patent Publication No. 8-507935 discloses that when the frame 100 is manufactured from synthetic resin, the edge portion 101a of the net 101 is embedded in the frame 100 by the insert molding method. ing.

Further, in the example shown in FIG. 8B, the frame 100 and the net 101 are both made of the same kind of synthetic resin, and the net 10 is formed by a high frequency welding method or an ultrasonic welding method.
The edge portion 101a of No. 1 is welded to the surface of the frame 100.

Further, in the example shown in FIG. 8 (c), an annular groove 102 opened radially outward is formed on the outer periphery of the frame 100, while the edge portion 101a of the net 101 is sewn in a tubular shape. The wire rod 103 is fitted in and the wire rod 103 is forcibly fitted in the annular groove 102.

[0006]

What is buried by insert molding as shown in FIG. 8A is a frame 100.
Since the boundary portion between the inner peripheral portion 100a and the net 101 has an edge shape, when a load such as weight is applied in a direction substantially orthogonal to the surface of the net 101 stretched in the space on the inner diameter side of the frame 100, There was a problem that the shearing force acts on the fibers of the net at the edge of the boundary portion, and the durability of the net 101 is low.

Similarly, as shown in FIG.
If the net 101 is welded to the surface of 0, the net 10
Since the tensile force acting on No. 1 directly acts on the welded portion, there is also a problem that the net 101 is easily peeled off and durability is low.

On the other hand, as shown in FIG. 8C, the net 101 wound around the outer peripheral surface of the frame 100 is the net 1
Since the edge portion 101a of No. 01 is bent, the attachment strength of the net 101 is high, but when moving the chair, the outer peripheral surface of the frame 100 of the seat body or the backrest (the winding side of the net 100) can be used for other furniture or the like. When a collision occurs,
There was a problem that the net 101 was easily cut.

Further, in any of the examples, since the frame 100 is made of a hard synthetic resin in order to maintain its strength, when moving the chair, the furniture 100 hits the frame of the seat or backrest against other furniture. Then, there was a problem that the furniture might be damaged.

Further, conventionally, when the manufacturing method of FIG. 8A is adopted, tension is applied to the net 101 stretched on the surface side of the frame 100.
When it is fitted into an injection molding die having a cavity according to the mold, the net 101 is restrained by the molding die in a state where tension is applied in advance and the synthetic resin is injected into the cavity to be solidified. In order to form 101 in a three-dimensional curved shape in the space on the inner diameter side of the frame 100, a three-dimensional curved constraining surface of the net 100 portion must be formed also in the injection mold. There was a problem of high cost.

An object of the present invention is to provide a body-supporting device such as a chair that solves such a problem, and a method for manufacturing such a device at low cost.

[0012]

In order to achieve the above object, a body supporting device such as a chair according to the invention of claim 1 is a sheet made of an elastic woven material or a net-like material for receiving a human body, and the sheet. Is provided with a frame made of synthetic resin stretched on the surface side and a protective frame that covers the outer peripheral surface of the frame, and the inside of the frame is defined as a space, so that the body of the person A body supporting device configured to be supported by a frame, the edge of the sheet being adhered and fixed to the outer periphery of the frame with caulking material, and the protective frame fixed from the back side of the frame. Is configured to cover the edge of the sheet.

According to a second aspect of the present invention, in the body supporting device such as the chair according to the first aspect, both the frame and the seat are made of thermoplastic synthetic resin that can be welded to each other, and the surface of the outer peripheral surface of the frame is the surface. While the side cross-sectional shape is formed in a convex curve, an annular groove for accommodating the caulking material is provided at a radially outer portion of the frame so as to extend over the entire circumference of the frame. Of the parts, on the opposite side of the convex curved surface across the concave groove, there is an inclined surface inclined so as to approach the inner diameter side of the frame as it approaches the back surface of the frame, and the edge portion of the sheet, The caulking material filled in the groove is fixed to the frame by welding performed on the inclined surface.

According to a third aspect of the present invention, in the body supporting device such as the chair according to the first or second aspect, when the frame is a backrest frame of the chair, the frame is By integrally forming an upper beam, a lower beam, and left and right side beams connecting between the left and right side ends of the upper and lower beams integrally in an annular shape, and forming the left and right side beams in an arc shape in a side view, The back side of the person supported by the seat of the inner diameter portion of the frame is configured not to contact the upper beam.

Further, the invention according to claim 4 is the body supporting device such as a chair according to claim 3, wherein the protective frame is appropriately lengthwise in the vertical direction of the middle part in the height direction of the backrest part. In the meantime, the protective edge portion that projects forward from the surface of the frame is integrally provided.

Further, in the invention according to claim 5, in the method for manufacturing a body supporting device such as a chair, the annular groove formed in the radially outer portion of the frame made of synthetic resin,
The thermoplastic caulking material is filled and solidified, and then the edge portion of the sheet made of an elastic woven material or a net-shaped material that receives the human body is passed from the convex curved surface side of the frame to the rear surface beyond the concave groove. Side of the inclined surface to be fused and temporarily fixed, and then, by heating the frame and the sheet for an appropriate time, the caulking material is once melted and then cooled, and the sheet is tensioned to form a cubic curved surface. It is provided and fixed to the frame.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a chair 1 having a seat body 2 and a backrest 3 to which the present invention is applied. Figure 2
FIG. 6 shows an embodiment of the backrest 3.

FIG. 2 is a perspective view of the backrest 3. As shown in FIGS. 1 and 2, the backrest 3 includes a frame 4 formed in a substantially rectangular frame shape in a front view, and a frame 4 as an example of a seat. A net 6 stretched on the front surface and a detachable annular protective frame 5 fixed with screws 7 (see FIGS. 5 and 6) so as to substantially cover the outer peripheral surface from the back surface of the frame 4 are provided.

As shown in FIGS. 2, 3 and 4, the lower beam 4a of the frame 4 is slightly forward, the upper beam 4b is rearward, and the left and right side beams 4c, 4c are upward at the rear and downward at the front. It is a three-dimensional (three-dimensional) shape in which those curved in a substantially bow shape in side view are integrally connected. Then, the first arms 8, 8 extending in the inner diameter direction of the frame 4 from the rear surface side of the upper and lower intermediate portions of the left and right beams 4c, 4c are connected to the lower beam 4a.
Central support frame portion 9 extending upward from the back surface of the left and right midway portion of the
The support frame portion 9 is connected to the upper end of the back support frame 1 which is L-shaped in side view and extends from the seat receiving body 10 of the chair 1.
It is fixed to 1 by screwing. In addition, the upper beam 4b
Alternatively, the first arms 8 and 8 and the central support frame portion 9 will be described later because they are arranged farther back than the positions of the left and right side beams 4c and 4c and the lower beam 4a in a side view (see FIG. 3). When the back of the person sitting in the chair is supported by the net 6 stretched in a three-dimensional curved shape as described above, the back of the person and the net 6 are supported.
Are formed so as not to contact the upper beam 4b, the first arms 8, 8 and the central support frame portion 9.

The sheet made of an elastic woven material or a net-like material (net 6 of this embodiment) that receives a human body may be a plain weave or a satin weave in which warps and wefts are interwoven. The fibers or threads are preferably composed of a plurality of elastomeric monofilaments. Further, it is preferable to use a synthetic resin of the same type (same system) as a material having a high possibility of reusing resources and to save the trouble of separating and collecting, and further to the net 6 by the manufacturing method described later. Considering the ease of fusion bonding between the edge of the net 6 and the frame 4 in order to make it possible to apply dimensional tension, a polyester-based thermoplastic synthetic resin is used as the material for the frame 4, the protective frame 5 and the net 6. It is preferable to use. In order to increase the mechanical strength (rigidity) of the frame 4, it is preferable to use a so-called glass reinforced plastic in which short glass fibers are contained in PET or PBT resin and elastomer.

As can be understood from FIGS. 5 and 6, the cross-sectional shapes of the upper and lower beams 4a and 4b and the left and right side beams 4c in the frame 4 are such that the cross-sectional shape of the outer peripheral surface of the frame 4 on the surface side is convexly curved. While being formed on the net support surface 13, an annular recessed groove 12 is provided at a radially outer portion of the frame so as to extend over the entire circumference of the frame 4. Of the radial outer side portion of the frame 4, the side opposite to the net support surface 13 which is the convex curved surface sandwiching the concave groove 12 is inclined so as to approach the inner diameter side of the frame 4 as it approaches the back surface of the frame 4. It has an inclined surface 14.

As shown in FIGS. 5 and 6, the protective frame 5 has a substantially L-shaped cross section, and the inclined surface 14 and the concave groove 12 at the rear surface side of the frame 4 and the radially outer portion of the frame 4. Has a shape capable of integrally covering the portion of the frame 4 and the left and right side beams 4c, 4c of the frame 4.
Of these, over the appropriate length in the vertical direction of the upper and lower midway parts,
A protective edge portion 16 that projects forward from the surface (net support surface 13) of the frame 4 is integrally provided (see FIGS. 2, 3, 4, and 5). At a place where the front surface side of the frame 4 is likely to collide with an edge of a desk top plate (not shown), the protective edge portion 16 collides first, so that the stretched net 6 is not damaged.
The frame 4 is manufactured by injection molding using a hard resin such as hard polyester. Protection frame 5
May be injection molded from a soft resin such as an olefinic elastomer.

Next, a manufacturing method for tensioning the net 6 on the frame 4 will be described with reference to FIGS. 7 (a) to 7 (d).

First, a caulking material 15 which is a thermoplastic adhesive is filled and applied to the annular concave groove 12 in the frame 4 which is previously formed by injection molding or the like and solidified (see FIG. 7A). . In that case, the amount of caulking material 15 to be filled is such that the cross section of the concave groove 12 is completely filled and rises to the outside of the inclined surface 14. The caulking material 15 is a polyester hot melt adhesive. When the depth of the cross section of the concave groove 12 is approximately 2 mm and the opening width dimension is approximately 3 mm, the filling amount of the caulking material 15 is 0.
It is about 08 g / cm.

Next, a net 6 is covered from the surface side (net support surface 13) of the frame 4 so as to cover the space which is the inner diameter portion of the frame of the frame 4, and the edge of the net 6 is
While being supported by the net support surface 13, the surface of the caulking material 15 made of a thermoplastic material, which has been previously stored in the groove 12 and solidified, is covered with ultrasonic welding to the net 6 on the inclined surface 14. The cone 18 is pressed and fused to the frame 4 and temporarily fixed 17 (see FIG. 7B). The number of temporary fixing points is substantially uniform without the net 6 partially wrinkling, and it is sufficient if the warp threads and the weft threads are held in an aligned manner. Good. It is also possible to weld in a dot shape or a linear shape without welding the entire width of the inclined surface 14.

Next, the frame 4 and the net 6 are
It is placed in a heating furnace (hot air drying furnace) (not shown) and heated for an appropriate time. In the embodiment, it was about 20 seconds at 190 ° C. ± 5 ° C. After that, it is left at room temperature and gradually cooled. The caulking material 15 that has been solidified is melted by the heating, and the caulking material 15 is applied to the texture of the net 6 (the gap between the warp threads and the weft threads, the mesh) of the net 6 that covers the concave groove 12 in the frame 4. Exuding, the surface of the fibers (threads) of the net 6 is filled with the viscous caulking material 15 without any gap, and the adhesion area of the net 6 to the outer peripheral surface of the frame 4 when the caulking material 15 is solidified by the subsequent cooling. Many, and the adhesive strength is significantly increased. Further, the net 6 made of the thermoplastic synthetic resin fiber shrinks in the fiber (thread) length direction by the heating. It is considered that this is because the amorphous portion of the resin such as polyester in the fiber is crystallized. Due to this contraction, the net 6 stretched over the frame 4 corresponds to the annular three-dimensional curved surface of the frame 4.
Tension that forms the next curved surface is applied. In the present embodiment, the cross-sectional display (hatching) of the net 6 is omitted.

The cooling means, as described above, may be allowed to stand at room temperature for gradual cooling, or may be actively cooled with cold air of a suitably low temperature.

When the backrest is manufactured by such a method,
No unevenness or wrinkles of the net 6 (sheet) is generated on the frame 4, and the net 6 (sheet) stretched in the space of the inner diameter portion of the frame 4 forms a three-dimensional curved surface, which can be placed on the back of a person who leans. Can fit well. Further, since it is not necessary to use an expensive molding die for forming the three-dimensional curved surface of the net 6 (sheet), there is a remarkable effect that the manufacturing cost can be significantly reduced.

The present invention can be variously embodied in addition to the above embodiments. For example, when applied to a chair, it goes without saying that the invention can be applied not only to the backrest but also to the seat body. In addition to chairs, it can be applied to various body-supporting devices such as beds and stretchers.

[0030]

As described in detail above, the first aspect of the present invention is as follows.
A body support device such as a chair according to the invention of claim 1 is a seat made of elastic woven or net-like material for receiving a human body,
The seat is provided with a frame made of synthetic resin stretched on the front surface side, and a protective frame that covers the outer peripheral surface of the frame, and the inside surrounded by the frame is a space so that the human body is seated. A body support device configured to be supported by a frame through a frame, wherein the edge portion of the sheet is adhered and fixed to the outer peripheral portion of the frame with caulking material, and is fixed from the back surface side of the frame. The frame is configured to cover the edge portion of the sheet.

Therefore, since the edge portion of the sheet is bent with respect to the wide surface of the frame, the pulling force acting on the sheet does not directly act on the fixing portion (coking portion) with the frame, and for this reason. The effect of relaxing the tensile force acting on the fixed portion with respect to the frame and improving the seat attachment strength is achieved.

Further, since the protective frame is arranged on the outer periphery of the frame so as to cover the edge portion of the sheet, even if other furniture or the like collides with the frame, the edge portion of the sheet may be covered by the other furniture or the like. The effect of not damaging the furniture or damaging other furniture with the frame.

According to a second aspect of the present invention, in the body supporting device such as the chair according to the first aspect, both the frame and the seat are made of thermoplastic synthetic resin that can be welded to each other, and the surface of the outer peripheral surface of the frame is the surface. While the side cross-sectional shape is formed in a convex curve, an annular groove for accommodating the caulking material is provided at a radially outer portion of the frame so as to extend over the entire circumference of the frame. Of the parts, on the opposite side of the convex curved surface across the concave groove, there is an inclined surface inclined so as to approach the inner diameter side of the frame as it approaches the back surface of the frame, and the edge portion of the sheet, The caulking material filled in the groove is fixed to the frame by welding performed on the inclined surface.

As described above, since the caulking material filled in the concave groove provided on the radially outer surface of the outer circumference of the frame and the welding performed on the inclined surface adjacent to the caulking material are fixed to the frame, the frame of the seat is formed. It is possible to provide a body support portion having a strong fixing (stretching) strength with respect to and a firm tension. In addition, the protective frame can cover the caulking material and the welded portion to improve the appearance.

According to a third aspect of the present invention, in the body supporting device such as the chair according to the first or second aspect, when the frame is a backrest frame of the chair, the frame is By integrally forming an upper beam, a lower beam, and left and right side beams connecting between the left and right side ends of the upper and lower beams integrally in an annular shape, and forming the left and right side beams in an arc shape in a side view, The back side of the person supported by the seat of the inner diameter portion of the frame is configured not to contact the upper beam.

With this structure, when the back side of the person to be supported is supported by the seat stretched on the inner diameter side of the backrest frame, the upper beam is located at the rear side apart from the back side. The back side of the person leaning against the upper beam, the neck muscles, and the like do not come into direct contact with each other, and the sitting comfort is improved.

Further, in the invention according to claim 4, in the body supporting device such as the chair according to claim 3, when the frame is a frame for a backrest part of the chair, the protection frame has a backrest. A protective edge portion projecting forward from the surface of the frame is integrally provided over an appropriate length in the vertical direction of the middle portion in the height direction of the portion. According to this configuration, when the backrest frame collides with other members such as the edge of the desk top plate, furniture, etc., the protective edge portion collides first, and the sheet wound around the surface of the frame is damaged. Since it does not exist, the effect of improving the durability of the stretched sheet is exerted.

Further, in the invention according to claim 5, in the method of manufacturing a body supporting device such as a chair, the annular concave groove formed in the radially outer portion of the synthetic resin frame,
The thermoplastic caulking material is filled and solidified, and then the edge portion of the sheet made of an elastic woven material or a net-shaped material that receives the human body is passed from the convex curved surface side of the frame to the rear surface beyond the concave groove. Side of the inclined surface to be fused and temporarily fixed, and then, by heating the frame and the sheet for an appropriate time, the caulking material is once melted and then gradually cooled, so that the sheet has a cubic curved surface tension. And is fixed to the frame.

According to this manufacturing method, no unevenness or wrinkles of the sheet is generated in the frame, and the sheet stretched in the space of the inner diameter portion of the frame forms a three-dimensional curved surface, and the contact surface of the person who supports it. Can fit well. further,
Since it is not necessary to use an expensive molding die for forming the three-dimensional curved surface of the sheet, the remarkable effect is that the manufacturing cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a chair.

FIG. 2 is a perspective view of a frame and a protection frame.

FIG. 3 is a cross-sectional view of a frame and a protection frame.

FIG. 4 is a view of the frame and the protection frame as viewed from above.

5 is a cross-sectional view taken along the line VV of FIG.

6 is a cross-sectional view taken along the line VI-VI of FIG.

7A to 7C show respective steps of a manufacturing method, (a) is a diagram in which a caulking material is filled and applied, (b) is a diagram in which an edge portion of a net is temporarily fixed on an inclined surface, and (c) is a state in which it is heated. The figure, (d) is a figure after slow cooling.

FIG. 8A, FIG. 8B and FIG. 8C are diagrams showing a conventional example.

[Simple explanation of symbols]

1 Chair as an example of body support device 2 seats 3 backrest 4 frames 5 protection frame 6 net 4 protective edge 12 groove 13 Net mounting surface on the surface of the frame 14 Outer slope of frame 15 Caulking material 17 Temporary stop

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhisa Okada             Shares 1-4-12 Imafukuhigashi, Joto-ku, Osaka             Company Itoki Crebio F-term (reference) 3B084 EC01 EC03                 3B096 AB10

Claims (5)

[Claims] 1. A sheet made of a woven fabric or a net-shaped material having elasticity to receive a human body, a frame made of synthetic resin in which the sheet is stretched on the front side, and a protective frame covering the outer peripheral surface of the frame. A body supporting device configured to support a human body on a frame through a seat by forming a space surrounded by a frame, the edge portion of the seat comprising: A body-supporting device such as a chair, characterized in that the protective frame is adhered and fixed to the outer peripheral portion of the frame with a caulking material, and the edge portion of the seat is covered with the protective frame fixed from the back side of the frame. 2. The frame and the sheet are both made of a thermoplastic synthetic resin that can be welded to each other, and the cross-sectional shape of the outer peripheral surface of the frame on the front surface side is formed in a convex curved shape, while the outer radial portion of the frame is formed. An annular groove for accumulating the caulking material is provided so as to extend over the entire circumference of the frame. Out of the radially outer portion of the frame, on the side opposite to the convex curved surface sandwiching the groove. Has an inclined surface that inclines so as to approach the inner diameter side of the frame as it approaches the back surface of the frame, and the edge of the sheet is filled with caulking material in the groove and welding performed on the inclined surface. The body supporting device according to claim 1, wherein the body supporting device is fixed to a frame. 3. When the frame is a backrest frame of a chair, the frame is integrally formed with an upper beam, a lower beam, and left and right side beams connecting between left and right side ends of the upper and lower beams. And the left and right beams are formed in an arc shape in a side view so that the back side of the person supported by the seat of the inner diameter portion of the frame does not contact the upper beam. A body support device such as a chair according to claim 1 or 2, characterized in that 4. The protective frame is integrally provided with a protective edge portion projecting forward from the surface of the frame over an appropriate length in the vertical direction of a midway portion in the height direction of the backrest portion. The body supporting device such as a chair according to claim 3, wherein 5. A thermoplastic caulking material is filled and solidified in an annular concave groove formed in a radially outer portion of a synthetic resin frame, and then made of a woven or net-like material having elasticity for receiving a human body. The edge portion of the sheet is fusion-bonded from the convex curved surface side of the frame to the inclined surface on the rear surface side beyond the concave groove and temporarily fixed, and then the frame and the sheet are heated for an appropriate time. According to the method, the caulking material is once melted and then cooled, and the seat is fixed to the frame by applying tension to form a cubic curved surface, and then fixed to the frame.