KR100355319B1 - Cushion structure having a three-dimensional net - Google Patents

Abstract

It is inexpensive, thin, lightweight, and provides a cushion structure having various spring constants and securing predetermined cushion characteristics.

Pile layer with multiple piles 14 joining the three-dimensional (3D) net 8 to the upper mesh layer 10, the lower mesh layer 12, and the upper and lower mesh layers 10 and 12. And 3D net (8) to be foamed integrally with the pad material (6).

Description

Cushion structure {CUSHION STRUCTURE HAVING A THREE-DIMENSIONAL NET}

The present invention relates to a cushion structure employed in a seat or a bed.

In the conventional vehicle seat, a spring member is placed on a seat frame, and a pad material such as a foamed material, a rocking material, or a cotton is placed thereon, It is common to cover the skin with vinyl leather, woven fabric, and leather.

Moreover, in order to raise elastic force or shock absorption force, the thing which embedded the viscoelastic material in the pad material is also proposed.

On the other hand, it is common for sheets or beds other than the vehicle seat to further cover the pad member placed on the frame with a skin and a spring member for improving cushioning properties.

In the above-mentioned conventional seat or bed, although predetermined cushioning property is provided by the spring member or the pad material, the thickness is generally thick, heavy, and expensive.

The present invention has been made to solve such problems of the prior art, and is a cushion structure that is low in cost, thin in thickness, light in weight, has various spring constants, and secures predetermined cushioning properties. It aims to provide.

In order to achieve the above object, the invention described in claim 1 includes a pad material and a three-dimensional net embedded in the pad material, wherein the three-dimensional net is provided with an upper mesh layer and a lower mesh layer. And a pile layer having a plurality of piles joining the upper and lower mesh layers, wherein the three-dimensional net is foamed integrally with the pad material.

The invention according to claim 2 is characterized in that the pad material is impregnated into the three-dimensional net.

In addition, the invention according to claim 3 covers at least one of the upper and lower mesh layers with a pad material impregnation sheet to prevent the pad material from entering the interior of the three-dimensional net by the pad material impregnation sheet. It prevented it.

Moreover, invention of Claim 4 used the sheet | seat made from a thermoplastic polyurethane elastomer as said pad material impregnation prevention sheet, It is characterized by the above-mentioned.

The invention according to claim 5 is characterized in that the wire is inserted into the three-dimensional net and then foamed integrally.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the sheet | seat which employ | adopted the cushion structure by Embodiment 1 of this invention.

2 is a side view of the seat of FIG. 1;

3 is a front view of the seat of FIG. 1.

FIG. 4 is a partial cross-sectional perspective view of the seat cushion constituting the sheet of FIG. 1. FIG.

5 is a partially enlarged front view of the 3D net disposed in the seat cushion of FIG. 4;

6 is a partial cross-sectional side view of the 3D net of FIG.

7 is a load-strain curve of a three-dimensional mesh knit used as a 3D net.

FIG. 8 schematically illustrates various bubble tissues used for the upper and lower mesh layers of a 3D net.

(a) is a honeycomb-shaped (hexagonal) mesh shown in Figure 5,

(b) the diamond mesh,

(c) shows the chain insertion structure, respectively.

9 schematically shows the pile structure joining the upper and lower mesh layers,

(a) shows a linear structure corresponding to FIG.

(b) shows an eight-shaped linear structure,

(c) cross-sectional structure,

(d) shows the eight-shaped cross-shaped structure, respectively.

10 is a partial cross-sectional perspective view of a seat cushion according to a modification of the first embodiment.

Fig. 11 is a partial cross-sectional perspective view of a cushion structure according to the second embodiment of the present invention.

12 is a partial cross-sectional perspective view of a cushion structure according to a modification of FIG. 11.

13 is a partial cross-sectional perspective view of a cushion structure according to another modification of FIG. 11.

14 shows a cushion structure according to Embodiment 3 of the present invention,

(a) is an exploded perspective view of a 3D net embedded in a pad material,

(b) is a partial cross-sectional perspective view of the cushion structure after embedding.

Fig. 15 is a partial cross-sectional perspective view of a cushion member in which a 3D net is foamed integrally with a pad member in a rectangular shape.

16 is a plan view of the cushion member of FIG. 15.

FIG. 17 is a cross sectional view along line XVII-XVII in FIG. 16;

18 is a partial cross-sectional perspective view of a cushion member according to a modification of FIG. 15.

19 is a plan view of the cushion member of FIG. 18;

20 is a cross-sectional view taken along the line XX-XX of FIG. 19.

Fig. 21 is a graph showing the static characteristics of the cushion structure in which padding material is impregnated using a 3D net of item number 0900 2D shown in Table 2;

Fig. 22 is a graph showing the static characteristics of the cushion structure in which the 3D net of part number 90012-2 shown in Table 2 is adopted and the pad material is impregnated.

Fig. 23 is a graph showing the static characteristics of the cushion structure which adopts the 3D net of part number 90012-2 shown in Table 2 and does not impregnate the pad material.

24 is a seat cushion showing a position where a 3D net is embedded and a site where the static characteristics of FIGS. 21 to 23 are measured.

(a) is its plan view,

(b) is a side view thereof.

Fig. 25 is a graph showing the cushion structure showing the static characteristics of Figs. 21 to 23 and the dynamic characteristics of the cushion made only of urethane.

* Explanation of symbols for main parts of the drawings

2: seat cushion 4: seat back

6: pad material 8,16: 3D net

10: upper mesh layer 12: lower mesh layer

14: pile 18: pad material impregnation prevention sheet

20: wire S: sheet

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

1-3 show the seat | seat S which employ | adopted the cushion structure by Embodiment 1 of this invention, and was installed so that it could be set up in the seat cushion 2 and the seat cushion 2 arbitrarily (pivotally). A seat back 4 is provided.

As shown in FIG. 4, the seat cushion 2 is composed of a urethane pad material 6 and a three-dimensional net (hereinafter referred to as a “3D net”) 8 embedded in the center of the pad material 6. , The 3D net 8 is foamed integrally with the pad material 6, and the pad material 6 penetrates to the inside of the 3D net 8.

5 and 6 show a three-dimensional mesh knit constituting the 3D net 8, in which the weave of the fabric base is a honeycomb-shaped hexagonal mesh. In addition, the upper mesh layer 10 and the lower mesh layer 12 are combined into a pile layer composed of a plurality of piles 14 to form a three-dimensional three-dimensional truss structure.

Each yarn of the upper mesh layer 10 and the lower mesh layer 12 is formed by twisting a plurality of thin threads, while each of the piles 14 is formed of one coarse thread to be rigid for three-dimensional mesh knit. (剛性) is given.

Table 1 has shown the physical-material value of the material used for the upper mesh layer 10, the lower mesh layer 12, and the pile 14 which forms a pile layer.

In Table 1, "* A" means that the material was colored black. In addition, d means denier, 1d is the unit of thickness when one gram of thread is stretched to 9,000m, and 210d is one gram of thread to 9,000 / 210 = 42.9m. It is the thickness of the thread when I cut it. In addition, f represents a filament and is a unit which shows how many threads are comprised of 60 f, and 60f has comprised 1 thread with 60 thin threads. In addition, kg / 5 cm of tensile strength is the strength at the time of pulling the 5 cm wide mesh in the longitudinal direction. In addition, the "straightness" of a pile structure shows the state where the hexagon of the upper mesh layer 10 and the hexagon of the lower mesh layer 12 were completely superimposed when viewed from directly above, and "cross" is both Indicates a misaligned state.

In addition, the material of the three-dimensional mesh knit is preferably a thermoplastic resin, and can be molded into a fiber shape, and when it is made into a fabric, any material capable of expressing the strength required as a sheet stock may be used. Specific examples include thermoplastic polyester resins represented by polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyamides represented by nylon 6, nylon 66, and the like. Polyolefin resins represented by paper, polyethylene, polypropylene, and the like, or a resin obtained by mixing two or more of these resins.

In addition, the fiber of each pile 14 has a thickness of 380 d or more, preferably 600 d or more, and supports the load of the seated person applied to the three-dimensional mesh knit by the deformation of the hexagonal mesh and the inclination of the pile. It is possible to obtain a flexible structure in which stress concentration does not occur.

FIG. 7 shows the load-deflection curve of the three-dimensional mesh knit employed in the 3D net 8.

This curve is a curve obtained by pressing a compression plate of φ76 by cutting a three-dimensional mesh knit at a circumferential length of 653 mm, which is non-linear compared to elastic materials such as urethane. It becomes the clean curve of. In addition, since hysteresis is large, when employed in an automobile seat, vibration energy from the outside can be efficiently absorbed.

FIG. 8 schematically shows various bubble structures used as the upper and lower mesh layers 10 and 12, and (a) shows the honeycomb (hexagonal) mesh shown in FIG. (B) shows a diamond mesh and (c) shows a chain insertion structure, respectively.

In addition, FIG. 9 shows the pile structure which couples the upper and lower mesh layers 10 and 12 typically, (a) shows the linear structure corresponding to FIG. 6, and (b) shows the 8-shaped linear structure (C) shows the cross-shaped structure, and (d) shows the 8-shaped cross-shaped structure, respectively.

Table 2 shows the physical properties of the material used for the upper mesh layer 10, the lower mesh layer 12, and the pile 14 forming the pile layer and various other materials.

Remark (* 1): Sample size: 50 × 50㎜

Load time: 10 minutes

Neglect time: 10 minutes

10 shows a modification of Embodiment 1, wherein the seat cushion 2A is formed of a urethane pad material 6 and a 3D net 8 embedded in the lower part of the pad material 6, and the 3D net 8 ) Is foamed integrally with the pad member 6, and the pad member 6 penetrates inside the 3D net 8.

Fig. 11 shows a seat cushion 2B employing the cushion structure according to the second embodiment of the present invention.

The seat cushion 2B is formed of a urethane pad material 6 and a 3D net 16 embedded in the center of the pad material 6, and the 3D net 16 is foamed integrally with the pad material 6. However, the pad material 6 does not penetrate inside the 3D net 16.

More specifically, the seat cushion 2B covers the upper and lower surfaces of the 3D net 8 with a pad impregnation prevention sheet 18 made of thermoplastic polyurethane elastomer, and the entire circumferential surface thereof is subjected to vibration welding. After joining with (vibration welding), it is foamed integrally with urethane. At the time of foaming, intrusion of the pad material into the 3D net 8 is prevented by the pad material impregnation prevention sheet 18.

As the pad material impregnation prevention sheet 18, for example, Span Shione (registered trademark: Kanebo Co., Ltd.) having a structure in which thin continuous filaments of 100% polyurethane elastic fibers are randomly laminated. When a thin film or the like is used, the pad material 6 and the 3D net 16 are integrated with each other so that the 3D net 16 does not feel uncomfortable when sitting on the seat cushion 2B.

In addition, since the pad material does not penetrate into the interior of the 3D net 8, as described later, the spring constant in the normal use area including the perimeter of the equilibrium point is reduced as a whole.

12 shows a modification of Embodiment 2, and the sheet cushion 2C is formed of a urethane pad material 6 and a 3D net 16A embedded in the lower part of the pad material 6. Since the sheet cushion 2C has a structure in which the 3D net 16A is embedded in the lower portion of the pad member 6, only the upper surface of the 3D net 8 is covered with the sheet 18 at the time of foaming so that the sheet cushion is not covered.

13 shows another modified example of the second embodiment, and the sheet cushion 2D is formed of a urethane pad material 6 and a 3D net 16B embedded in the upper part of the pad material 6. Since the sheet cushion 2D has a structure in which the 3D net 16B is embedded in the upper portion of the pad member 6, only the lower surface of the 3D net 8 is covered with the sheet 18 during foaming, and the upper surface is not covered. .

Fig. 14 shows a seat cushion 2E employing the cushion structure according to the third embodiment of the present invention.

This seat cushion 2E inserts the wire 20 bent in a U-shape around the circumference of the 3D net 8, and then foams integrally with the pad material 6 to the center of the pad material 6. The 3D net 8 is embedded.

In this configuration, since the deformation of the 3D net 8 is restricted by the wire 20, the feeling of spring increases, the area to withstand load increases, and the impact applied to the bottom end is reduced.

In the above embodiment, the 3D nets 8, 16 (16A, 16B) were foamed integrally with the urethane-based pad material 6, but as shown in FIG. In the structure in which the 3D net 8 (16A) is embedded in the lower part, as shown in FIGS. 15-17, the 3D net 8 is integrally foamed in a rectangular shape with the urethane pad material 20, and the sheet A rectangular recess is formed in the lower part of the pad material 6 foamed in shape, and the pad material 20 can be embedded in this recess.

In addition, instead of the configuration of FIGS. 15 to 17, as shown in FIGS. 18 to 20, the 3D net 16A may be integrally foamed with the pad material 20 in a rectangular shape.

In addition, in the structure of FIG. 11 or FIG. 13, the bubble structure of the honeycomb mesh shown in FIG. 8 (a) is used as the upper mesh layer 10 of the 3D net 8, and the lower mesh layer As (12), the bubble structure of the chain insertion structure shown in FIG. 8 (c) can also be adopted.

In this case, compared with the bubble structure of the honeycomb mesh, since the chain insertion bubble structure is thinner, the lower surface of the 3D net 8 is not covered with the sheet 18 when foamed integrally with the pad material 6. Even if the pad material 6 does not penetrate into the inside of the 3D net 8.

FIG. 21 is a graph showing the static characteristics of the cushion structure according to the present invention in which the 3D net of part number 09002D shown in Table 2 is adopted and the pad material is impregnated,

22 and 23 are graphs showing the static characteristics of the cushion structure impregnated with the pad material and the cushion structure not impregnated with the pad material, respectively, employing the 3D net of standard 90012-2. This graph is obtained by compressing a compression plate of φ98 to 24.8 mm at a rate of 50 mm / minute. In the drawings, k1 to k6 represent spring constants, and the spring constants of Tables 3, 4, and 5 correspond to the static characteristics of FIGS. 21, 22, and 23, respectively.

In addition, FIG. 24 shows the position where the 3D net was embedded and the site | part (H point) which measured the static characteristic of FIGS. 21-23, and H point corresponds roughly to the sciatic nodule part of the person who is not in a seat.

Unit: N / mm k1 k2 k3 k4 k5 k6 3D net 90.20 118.90 393.00 - - - urethane 8.81 3.76 9.15 29.15 84.03 - 3D net + urethane 5.68 5.52 22.28 135.92 337.57 334.20

Unit: N / mm k1 k2 k3 k4 k5 k6 3D net 37.20 14.30 90.30 - - - urethane 8.81 3.76 9.15 29.15 84.03 - 3D net + urethane 4.89 5.57 14.71 40.94 62.17 96.93

Unit: N / mm k1 k2 k3 k4 k5 k6 3D net 37.20 14.30 90.30 - - - urethane 8.81 3.76 9.15 29.15 84.03 - 3D net + urethane 6.82 4.77 12.11 18.21 25.69 113.53

FIG. 25 is a graph showing the dynamic characteristics of a cushion made of only urethane and the cushion structure showing the static characteristics of FIGS. 21 to 23, and a random wave using a triaxial exciter. It is obtained by inputting (test subject weight: 94 kg).

As can be seen from the graph of Fig. 25, the cushion structure in which the 3D net is impregnated with urethane has a large spring constant, and in particular, the cushion structure employing part No. 09002D has a deteriorated damping characteristics in the high frequency region. However, it can cope with large loads and is excellent in attenuation in the low frequency region. On the other hand, the cushion structure which does not impregnate a 3D net with urethane has little spring constant as a whole, and is a structure corresponding to high frequency.

Since the cushion structure according to the present invention can provide arbitrary spring constants by the combination of various 3D nets and urethanes, an appropriate cushion structure can be selected depending on the stiffness of the chassis when employed in a vehicle seat. .

In addition, although the static characteristic of FIGS. 21-23 is a case where the 3D net was embedded in the lower part of a pad material, when embedding in the upper part of a pad material, the air permeability of a sheet can be improved and it embeds in the center part of a pad material. In one case, the stroke amount can be adjusted by selecting the 3D net.

The cushion structure according to the present invention used as a three-dimensional mesh knit 3D net forms an upper or lower mesh layer in a honeycomb shape, and each of the plurality of piles 28 is formed of one coarse thread, and also a truss structure. Therefore, it has the following features.

(1) Since each pile has an elastic function, hardness, elasticity, and fitness can be controlled by changing the material, fiber thickness, structure, and mechanical properties.

(2) By using the honeycomb shape memory function, the stability can be improved and the deformation can not be easily performed.

(3) With the truss structure, a thin elastic structure that is difficult to deform can be formed to improve pressure dispersion, absorption and fit.

(4) Since each part of the honeycomb truss structure is an independent uniform cushion member, it is excellent in body pressure dispersion (low pressure, uniform body pressure distribution), and absorbs physical differences. In contrast, low-pressure concentrations of body pressure in the sciatic nodules, which are relatively insensitive to fatigue, can prevent forward slipping in skinny and skinny people. In addition, it is excellent in weight mobility, easy to change posture, easy to cope, and also reduces shear shear force.

(5) The honeycomb truss structure does not lead to a hammock state (local pressure is concentrated and a strong side pressure feeling), and natural posture support is possible, and the elastic effect of each part of the honeycomb shape By this, foreign bodies (異物 感) is also reduced.

(6) When not impregnated with urethane, an air layer is formed inside the honeycomb truss structure, and thus excellent in permeability and breathability.

(7) The strength is increased by the honeycomb truss structure.

Since this invention is comprised as mentioned above, it exhibits the effect as described below.

According to the invention of claim 1 of the present invention, the three-dimensional net is composed of a pile layer having a plurality of piles combining the upper mesh layer, the lower mesh layer, and the upper and lower mesh layers, and the three-dimensional net is a pad material and Since the foam is integrally formed, the spring property of the pad member can be supplemented and filled with a three-dimensional net, and the predetermined cushioning property can be secured even with a thin and lightweight cushion structure.

In addition, according to the invention described in claim 2, since the pad material is impregnated inside the three-dimensional net, the pad material is attached to each pile constituting the three-dimensional net, thereby increasing the rigidity, thereby providing a cushion structure having a large spring constant. .

In addition, according to the invention of claim 3, since the pad member is prevented from infiltrating into the interior of the three-dimensional net by the pad material impregnation prevention sheet, the interior of the three-dimensional net becomes a pore structure, thereby providing a cushion structure with less spring constant. Can be.

Moreover, according to invention of Claim 4, since the sheet | seat made from thermoplastic polyurethane elastomer was used for the pad material impregnation prevention sheet, the pad material impregnation prevention sheet integrates with a pad material without hardening, and does not feel a discomfort when sitting.

In addition, according to the invention of claim 5, since the wire is inserted into the three-dimensional net and then foamed integrally, the spring feeling increases, the area to withstand load increases, and the impact applied to the bottom end is reduced.

Claims (5)

A plurality of piles having a pad material and a three-dimensional net embedded in the pad material, wherein the three-dimensional net combines an upper mesh layer, a lower mesh layer, and the upper and lower mesh layers. a pile layer having a pile, foaming the three-dimensional net integrally with the pad material, and covering either layer of the upper and lower mesh layers with a pad material impregnation prevention sheet, thereby preventing the pad material impregnation. Cushion structure characterized in that the pad material is prevented from entering the interior of the three-dimensional net by the sheet. delete delete The cushion member according to claim 1, wherein a thermoplastic polyurethane elastomer sheet is used as the pad material impregnation prevention sheet. The cushion member according to claim 1, wherein a wire is inserted into the three-dimensional net and then foamed integrally.