JP2001192956A - Method of treating end of net material, and net material using the net end treatment method, and sheet structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fitting properties of a net material to a frame material. SOLUTION: The cut faces of terminal ends 14 of the net material with a three-dimensional structure are covered with a covering material that is to be fixed by vibration welding. Thus, the fingers and the clothes of a sitter never come into direct contact with threads or yarns of the net material and they are completely prevented from being hooked to threads or fibers and the touch is kept good. In addition, as the cut face of the terminal part 14 are not exposed, the appearance is kept good. Since the elongation of the terminal ends is suppressed by the cover material 20, it can be readily attached to the frame material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal processing method for a three-dimensionally structured net material, a net material having a terminal portion processed by the terminal processing method, and a sheet structure using the net material.

[0002]

2. Description of the Related Art Seats having good cushioning properties, such as automobile seats, are usually provided with a spring material such as a coil spring or an S-shaped spring on a seat frame, and a pad material made of urethane or the like. And the surface thereof is covered with vinyl leather, cloth or the like. However,
The sheet thus formed has a large overall thickness including the spring material and is heavy. Except for those adopting a special mechanism such as forming a ventilation hole in the pad material, the ventilation is generally poor. A device employing a special mechanism for ensuring ventilation has a problem that the manufacturing cost is high.

As a sheet for improving the above-mentioned point, a sheet using a net material having a truss structure (three-dimensional structure) in which a front mesh layer and a back mesh layer are connected by a large number of piles is known. . Since it has a truss structure, it is an elastic structure that is difficult to set, and has excellent body pressure dispersion and absorption characteristics. Therefore, a large cushioning property can be exhibited even with a thin shape. Moreover, because of the net structure, it has a large number of voids and is excellent in air permeability without any special mechanism.

[0004]

The net material having a three-dimensional structure has the above-mentioned features, but has a surface mesh layer,
Since it is composed of a backside mesh layer and a pile, when it is used for the above-mentioned applications, simply cutting it to a predetermined size is likely to cause the yarns and fibers constituting these to be easily frayed, unattractive, and handled. Inconvenient.
Therefore, conventionally, in order to improve the appearance of the terminal portion and facilitate handling, the terminal portion is covered with a skin material and both are sewn.

[0005] However, the sewing operation is time-consuming and troublesome. In addition, since the terminal portion is merely sewn, the rigidity of the terminal portion is not so different from the inner portion thereof, and there is a problem that the extension of the terminal portion impairs the attachment to the frame material.

[0006] Further, without sewing, a plate-like cover member is laminated on the upper surface of the terminal portion, and fixed to a frame member together with the plate-like cover member using screws.
In this case, there is no problem in terms of attachment to the frame material, but since the cut surface of the terminal portion is exposed, the fingers or clothes of the seated person are caught by the yarn or fiber constituting the net material. Not only does it feel bad, but there are still problems with the appearance.

[0007] Further, there is also known a processing method in which the end portion is continuously joined along the cut surface thereof with the front mesh layer, the back mesh layer, and the pile by vibration welding to eliminate the fray of the yarn and the fiber and to increase the rigidity. Have been.

[0008] However, when such a continuous vibration-welded product is used for a seat cushion of a wheelchair, for example, it is located on the front end side and the rear end side as compared with the expansion and contraction rate of the central portion. Each terminal cannot be expanded or contracted much. In addition, the terminal portions located on the front end side and the rear end side are not supported by the frame member, and are free ends. Therefore, there is a possibility that the terminal portion having a small expansion / contraction ratio is broken by the load of the seated person.

On the other hand, as a seat structure of a wheelchair,
JP-A-11-137609 and JP-A-11-239
No. 590 is disclosed, but the one adopted for the seat is made of fabric, or
In the case of considering cushioning properties, it is a mat-like one with a certain thickness, and in any case, there is a problem in terms of air permeability, and even if it is thin, it can demonstrate large cushioning properties and has excellent breathability It has been desired to employ a net material having a three-dimensional structure for a wheelchair seat (seat cushion).

[0010] The present invention has been made in view of the above,
SUMMARY OF THE INVENTION It is an object of the present invention to provide a terminal processing method for a net material which can be easily attached to a frame material and can improve the feel and appearance. The invention according to claim 2 provides a terminal processing method for a net material which can improve the elasticity of a terminal portion arranged as a free end, reduce the risk of being broken by a load of a occupant, and have an excellent appearance. The task is to According to the third aspect of the present invention, in the terminal portion attached to the frame material, the attachment property to the frame material, the feel and the appearance can be improved, and in the terminal portion arranged as a free end, the stretchability is improved. It is another object of the present invention to provide a terminal processing method for a net material that can reduce the risk of being broken by a load of a seated person. The invention described in claim 4 can improve the attachment property to the frame material and the feel and appearance, or improve the elasticity of the terminal portion arranged as a free end, and may be broken by the load of the occupant. It is an object to provide a net material having a small size. According to the invention of claim 5, in the terminal portion attached to the frame material, the attachment property to the frame material, the feel and the appearance are improved,
It is an object of the present invention to improve the elasticity of a terminal portion arranged as a free end, reduce the possibility of tearing by the load of a occupant, and provide a seat structure particularly suitable for application to a wheelchair.

[0011]

According to a first aspect of the present invention, there is provided a method of treating a net material according to the present invention, comprising a front mesh layer and a back mesh layer. A terminal processing method for processing a terminal portion of a net material having a three-dimensional structure formed by combining a mesh layer with a number of piles, wherein a cut surface of the terminal portion is covered with a synthetic resin cover member. At least one side of the terminal portion is processed by vibration welding and fixing the cover member.

According to a second aspect of the present invention, there is provided a method for treating a net material, comprising a front mesh layer and a back mesh layer, and the front mesh layer and the back mesh layer are connected by a large number of piles. A terminal processing method for processing a terminal portion of a net material having a three-dimensional structure, wherein the terminal portion is folded inward from a cut surface thereof, the folded portions are vibration-welded in a point-like manner, and a portion having high rigidity is dotted. It is characterized in that it is processed so as to exist in a shape.

According to a third aspect of the present invention, there is provided a method for treating a net material, comprising a front mesh layer and a back mesh layer, and the front mesh layer and the back mesh layer are connected by a number of piles. A terminal processing method for processing a terminal part of a net material having a three-dimensional structure, wherein a part of the terminal part is covered with a cut surface of the terminal part by a cover member made of a synthetic resin, and at least the terminal part is covered. On one side, the cover member is processed by vibration welding and fixed, and the other end portion is folded inward from the cut surface, the folded portions are vibration welded to each other in a point shape, and a portion having high rigidity is dotted. It is characterized in that it is processed so as to exist in a shape.

According to a fourth aspect of the present invention, there is provided a net material having a three-dimensional structure comprising a front mesh layer and a back mesh layer, and the front mesh layer and the back mesh layer are connected by a number of piles. Characterized in that it comprises a terminal portion processed by using the terminal processing method according to any one of claims 1 to 3.

[0015] The structure of the sheet of the present invention according to claim 5 is as follows.
A net having a three-dimensional structure including a front mesh layer and a back mesh layer, and having the front mesh layer and the back mesh layer joined by a large number of piles, and a frame material supporting the net material. In the structure of the sheet provided, the net material is such that a part of the terminal part is covered with a synthetic resin cover member fixed by vibration welding on at least one side of the terminal part. The other terminal part is folded inward from the cut surface, and the folded parts are vibration-welded in a point-like manner,
The terminal processing is performed so that the high rigidity part is present in a point shape, and after arranging the other terminal part to be a free end, a part of the terminal part covered with the cover member is removed. The cover member is attached to the frame member by screwing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. FIG. 1 is a cross-sectional view showing a part of a net member 10 constituting a structure according to the present embodiment. As shown in this figure, the net member 10 has a three-dimensional truss structure (a three-dimensional truss structure) having a front mesh layer 11, a back mesh layer 12, and a large number of piles 13 connecting the front mesh layer 11 and the back mesh layer 12. Three-dimensional structure).

As shown in FIG. 2, the surface mesh layer 11 is formed from a twisted yarn obtained by twisting a thin yarn into a structure having a honeycomb (hexagonal) mesh. For example, as shown in FIG. 3, the back mesh layer 12 is formed by twisting a thin thread into a rubber knit, and has a mesh (fine) smaller than the honeycomb-shaped mesh of the front mesh layer 11. Is formed. Pile 13
Is formed of fibers or yarns and woven between the front mesh layer 11 and the back mesh layer 12 so that the front mesh layer 11 and the back mesh layer 12 maintain a predetermined distance. A predetermined rigidity is given to the net material 10 which is a mesh knit.

In the present embodiment, when a layer having a honeycomb-shaped mesh is used as a surface material (for example, as a cushion material constituting a seat cushion portion of a wheelchair,
Although the surface is in contact with the human body), this can be used as the back surface, and a layer having a small mesh can be used as the front surface. Further, as shown in Table 1 described later, it is of course possible to adopt a honeycomb shape or a mesh shape other than fine as the mesh layer structure.

The material constituting the net material 10 is preferably a thermoplastic resin, and may be any material that can be formed into a fibrous shape and can exhibit the strength required as a sheet material when woven. For example, thermoplastic polyester resins represented by polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyamide resins represented by nylon 6, nylon 66, and the like;
Polyolefin resins represented by polyethylene, polypropylene, and the like, or resins obtained by mixing two or more of these resins can be used.

The thickness of the pile 13 is 380
d or more, preferably 600 d or more. As a result, the load of the occupant applied to the net material 10 used as the cushion material constituting the seat cushion portion is reduced by the deformation of the mesh constituting each of the mesh layers 11 and 12 and the pile 1.
3 can be supported by the fall, and a flexible structure free from stress concentration can be obtained.

For reference, Table 1 shows some examples of materials that can be used as the net material 10 and their physical properties.

[0022]

[Table 1]

In Table 1, "d" represents denier,
1d is a unit of thickness when one gram of yarn is pulled 9,000 m, for example, 220d is a yarn of a thickness when one gram of yarn is pulled 9,000 / 210 = 42.9 m. “F” represents a filament and is a unit indicating how many thin yarns the yarn is composed of, for example, 70
f means that one thread is composed of 70 thin threads. The tensile strength of “kg / 5 cm” is the strength when a material having a width of 5 cm is pulled. The “parallel” of the pile structure refers to a state where the pile 13 connecting the front mesh layer 11 and the back mesh layer 12 does not intersect when viewed from the side, and the “cross” refers to a state where the pile 13 intersects when viewed from the side. Say.

Next, a terminal processing method for processing the terminal portion 14 on the periphery of the net member 10 will be described with reference to FIGS. First, a first terminal processing method will be described. In this terminal processing method, as shown in FIG.
A plate-like portion 21 having a predetermined size that can be joined along either one of the outer peripheral portion of the outer peripheral portion of the surface mesh layer 11 and the outer peripheral portion of the peripheral portion of the back mesh layer 12;
And a folded portion 22 that extends from the plate portion 21 in a substantially U-shape so as to form an insertion gap 23 into which the terminal portion 14 of the net material 10 can be inserted. A synthetic resin cover member 20 is prepared.

Then, as shown in FIG. 5, first, the terminal portion 14 of the net material 10 is inserted into the insertion gap 23 of the cover member 20, and the cut surface of the terminal portion 14 is 20 is covered with a curved portion 24 having a substantially U-shaped cross section located between the plate portion 21 and the folded portion 22. next,
Substantially central portion 25 of plate-like portion 21 constituting cover member 20
Is fixed to one side (in the present embodiment, the outer peripheral surface of the surface mesh layer 11) of the terminal portion 14 by vibration welding.

According to this terminal processing method, the net material 10
The cut surface of the end portion 14 is covered with the curved portion 24 of the cover member 20, so that it is possible to prevent the threads and fibers constituting the net material 10 from fraying. In addition, since the fingers and clothes of the seated person do not come into direct contact with the cut surface of the terminal portion 14, the net material 10 can be prevented from being caught on the yarn or fiber, and the feel is good. Further, since the cut surface of the terminal portion 14 is not exposed, the appearance is good. Further, the terminal unit 1
By attaching the cover member 20 to the terminal member 4 as described above, the extension of the terminal portion 14 is suppressed, so that the terminal member 14 can be easily attached to the frame member.

The cover member 20 used in this terminal processing method includes a terminal portion 14 such as a curved portion 24.
Like the portion covering the cut surface of the
At least one surface of the terminal portion 14 (either the outer peripheral surface of the surface mesh layer 11 or the outer peripheral surface of the back mesh layer 12) is provided with a portion that can be joined to the one surface. Any object may be used. Further, as a welding means for fixing the cover member 20 to the net material 10, means such as heat sealing and ultrasonic welding can be considered.
Vibration welding is appropriate for reliable welding.

Next, a second terminal processing method will be described. In this terminal processing method, the terminal portion 14 of the net material 10 is vibration-welded in a point-like manner, and processing is performed so that a highly rigid portion exists in a point-like manner. More specifically, for example, as shown in FIG. 6, first, the vicinity 10B of the cut surface forming the terminal portion 14 of the net material 10 is set at about 180 ° inward with respect to the main body portion 10A of the net material 10. Fold back to 10B near the cut surface
Outer surface of the back mesh layer 12 and the main body 1 of the net material 10
The vicinity 10B of the cut surface and the main body 10A are overlapped so that the outer surface of the back mesh layer 12 of 0A is in contact with the outer surface. Next, as shown in FIG.
0B and the body portion 10A are overlapped, that is, the folded portions are sandwiched between the molds 30, 30 in which a plurality of convex portions 31, 31 are formed at predetermined positions at corresponding positions from above and below, respectively. Then, each mold 30, 30 is vibrated. When the dies 30, 30 vibrate, heat is generated between the opposing convex portions 31, 31, and the heat causes the vicinity of the cut surface 10 </ b> B of the net material 10 and the main body 10 </ b> A, as shown in FIG. 8. Of the sites where
Only the portion 15 sandwiched between the convex portions 31, 31 is welded and thinned, and the portion 15 subjected to vibration welding has a higher rigidity than the other portion (non-welded portion) 16 not welded. .

According to this terminal processing method, the net material 10
The non-welded portion 16 of the terminal portion 14 has a relatively low rigidity and expands and contracts because the terminal portion 14 of the The rate is large. Therefore, the elasticity of the terminal portion 14 is improved and the terminal portion 14 becomes more flexible as compared with the conventional case where the terminal portion is continuously and linearly welded by vibration. as a result,
When such a net material 10 is used, for example, as a cushion material constituting a seat cushion portion of a wheelchair,
Although the terminal unit 14 is arranged as a free end, the terminal unit 1
Since 4 expands and contracts appropriately, the risk of being broken by the load of the seated person can be reduced.

Next, a third terminal processing method will be described. This terminal processing method relates to a combination of the above-described first and second terminal processing methods. That is, for example, as shown in FIG. 9, one of a pair of terminal portions 14 a and 14 b facing each other among the terminal portions 14 on the periphery of the net material 10 formed in a substantially square shape.
The terminal portions 14a,
The cut surface of the end portion 14b is covered, and the cover member 20 is fixed by vibration welding on at least one side of the end portions 14a and 14b (first end processing method, see FIG. 5). Further, the other pair of terminal units 14c and 14d facing each other
Is subjected to vibration welding in a point-like manner, and processing is performed so that the highly rigid portion 15 exists in a point-like manner (second terminal processing method, see FIG. 6).

According to this terminal processing method, the net material 10
Are processed by the first terminal processing method described above, and the other terminals 14c and 14d are processed by the second terminal processing method described above.
When such a net material 10 is used as a cushion material constituting a seat cushion portion of a wheelchair, for example, some of the terminal portions 14a and 14b are attached to the frame materials 40 and 40 of the wheelchair using screws 50. ,
The attachment property to the frame members 40, 40, and the feel and appearance can be improved. Further, in the other terminal portions 14c and 14d arranged as free ends, even if the occupant is seated, it can be appropriately expanded and contracted to reduce the risk of being broken by the load of the occupant.

Here, as shown in FIGS. 9 and 10, the cover member 20 has screw holes 2 at positions corresponding to a plurality of screw holes 41 formed at predetermined intervals in the frame member 40.
5 is formed, and a screw 50 is screwed into the screw hole 25 via a washer 60.

The present invention is, of course, not limited to the above embodiment. In the above description, the case where the net material 10 having the three-dimensional structure is applied to a wheelchair seat is described as an example. However, a vehicle seat, a chair for furniture used for a learning desk or an office desk, a movie theater, And the like can be applied to seats and the like.

[0034]

As described above, the terminal processing method for the three-dimensionally structured net material of the present invention, the net material having the terminal part processed by the terminal processing method, and the structure of the sheet using the net material According to the method, by being subjected to a terminal treatment by a cover member capable of covering a cut surface of a terminal portion of the net material, the yarn and fibers constituting the net material are hardly frayed, and the feel and appearance are good, and the frame material is good. It can be easily attached to the device. In addition, the terminal portion is vibration-welded in a point-like manner, and the processing is performed so that a highly rigid portion is present in a point-like manner, thereby improving the elasticity of the terminal portion arranged as a free end, and being broken by a load of a seated person. The risk can be reduced. Therefore, particularly, the net material subjected to such terminal treatment is suitable as a cushion material for a seat cushion portion employed in a wheelchair seat structure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of a net material forming a structure according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a surface mesh layer of the net material shown in FIG. 1;

FIG. 3 is an enlarged view showing a back surface mesh layer of the net material shown in FIG. 1;

FIG. 4 is a perspective view showing an example of a cover member used in the first terminal processing method.

FIG. 5 is a diagram illustrating a state where a terminal portion of a net material is subjected to terminal processing using the cover member illustrated in FIG. 4;

FIG. 6 is a diagram illustrating a state in which a terminal unit of a net material is terminal-processed by a second terminal processing method;

FIG. 7 is a diagram for explaining a step of vibration welding a terminal portion of a net material in the second terminal processing method.

FIG. 8 is a cross-sectional view showing a state where the terminal portion of the net material is terminal-processed by the second terminal processing method.

FIG. 9 is a diagram illustrating a state in which a net material whose terminal portion has been terminal-processed by a third terminal processing method is attached to a frame material;

FIG. 10 is a sectional view taken along the line AA of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Net material 11 Surface mesh layer 12 Back mesh layer 13 Pile 14 Terminal part 20 Cover member 21 Plate part 22 Folding part 23 Insertion gap 24 Curved part 40 Frame material

Claims (5)

[Claims] 1. A terminal for processing a terminal portion of a three-dimensionally structured net material having a front mesh layer and a back mesh layer, wherein the front mesh layer and the back mesh layer are connected by a number of piles. A processing method, wherein a cut surface of the terminal portion is covered with a cover member made of a synthetic resin, and the process is performed by fixing the cover member by vibration welding on at least one surface side of the terminal portion. Terminal processing method of the net material to do. 2. A terminal for processing a terminal portion of a three-dimensionally structured net material having a front surface mesh layer and a rear surface mesh layer, wherein the front surface mesh layer and the rear surface mesh layer are connected by a number of piles. A processing method, wherein the terminal portion is folded inward from a cut surface thereof, the folded portions are vibration-welded to each other in a point-like manner, and a processing is performed so that a highly rigid portion exists in a point-like manner. Material termination method. 3. A terminal for processing a terminal portion of a three-dimensionally structured net material having a surface mesh layer and a back surface mesh layer, wherein the surface mesh layer and the back surface mesh layer are connected by a number of piles. In a processing method, a part of the terminal part is covered with a cut surface of the terminal part by a cover member made of a synthetic resin, and the cover member is fixed by vibration welding on at least one surface side of the terminal part. The other end portion is folded inward from the cut surface, the folded portions are vibration-welded to each other in a point-like manner, and the processing is performed so that a highly rigid portion exists in a point-like manner. Material termination method. 4. A net material having a three-dimensional structure, comprising a surface mesh layer and a back surface mesh layer, wherein the surface mesh layer and the back surface mesh layer are connected by a number of piles. A net material comprising a terminal portion processed by using the terminal processing method according to any one of the above-mentioned items. 5. A net material having a three-dimensional structure, comprising a front mesh layer and a back mesh layer, wherein the front mesh layer and the back mesh layer are connected by a number of piles, and supports the net material. The net material has a cut surface formed by a synthetic resin cover member having a part of the terminal part fixed by vibration welding on at least one surface side of the terminal part. Is treated so as to be covered, and the other terminal portion is turned inward from its cut surface,
By vibrating and welding the turned-back portions to each other in a point-like manner, the terminal treatment is performed so that a highly rigid portion exists in a point-like manner, and the other terminal portion is arranged so as to be a free end. A seat structure, wherein a part of a terminal portion covered with a cover member is attached to the frame member together with the cover member by screwing.