KR20000076551A - 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.

The 3D net 8 consists of a pile layer having a top mesh layer 10, a bottom mesh layer 12, and a plurality of piles 14 joining the top and bottom mesh layers 10, 12, Allow the 3D net (8) to foam together 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, a pad material such as a foamed material, a rocking material, or a cotton is placed thereon, and a vinyl leisure is placed thereon. It is common to cover the skin, such as woven fabrics and leather.

Moreover, in order to raise elastic force or shock absorption force, the thing in which viscoelastic material was embedded 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 material placed on the frame with a skin and a spring member for improving cushioning properties.

In the above conventional seat or bed, although predetermined cushioning property is imparted by the spring member or the pad material, the thickness is generally thick, heavy and expensive in many cases.

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

In order to achieve the above object, the invention according to 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; It is composed of a pile layer having a plurality of piles (piles) to combine the upper and lower mesh layer, characterized in that the cushion structure characterized in that the three-dimensional net is foamed integrally with the pad material.

The invention according to claim 2 is characterized in that the pad member is impregnated inside 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.

The invention according to claim 4 is characterized in that a sheet made of a thermoplastic polyurethane elastomer is used as the pad material impregnation preventing sheet.

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

1 is a perspective view of a sheet employing a cushion structure according to Embodiment 1 of the present 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 shows the various bubble structures used in the upper and lower mesh layers of the 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;

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 in accordance with a modification of FIG. 11.

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

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 in accordance with 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 part 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 produced only with 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 file 18 pad prevention material

20: wire S: sheet

Next, embodiment of this invention is described, referring drawings.

1 to 3 show the seat S employing the cushion structure according to the first embodiment of the present invention, and are installed so that the seat cushion 2 and the seat cushion 2 can be freely laid down ( A pivotally mounted 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, and 3D. The net 8 foams integrally with the pad material 6, and the pad material 6 penetrates into the inside of the 3D net 8.

5 and 6 show a three-dimensional mesh knit constituting the 3D net 8, wherein the weave of the fabric base is a honeycomb-shaped hexagonal shape. At the same time, 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 to a three-dimensional mesh knit. (剛性) is given.

Table 1 shows the physical values of the material used for the upper mesh layer 10, the lower mesh layer 12, and the pile 14 forming the pile layer.

In Table 1, "* A" means the thing which colored the material 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, which can be molded into a fibrous shape and, if it is made of a woven fabric, can be one having the strength required as a sheet stock. Specific examples include thermoplastic polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), nylon 6, nylon 66, and the like. Representative examples include polyamide resins, polyethylene, polypropylene and the like, polyolefin resins such as representative examples, or resins in which two or more kinds of these resins are mixed.

Further, the fiber of each pile 14 has a thickness of 380 d or more, preferably 600 d or more, and it is possible to support 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 distress structure in which stress concentration does not occur.

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

This curve is a three-dimensional mesh knit cut to a circumferential length of 653 mm, It is a curve obtained by pressing the compression plate of 76, and it becomes a non-linear clean curve compared with elastic materials, such as urethane. 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) is a honeycomb shape (hexagonal) shown in FIG. 5. The mesh, (b) shows a diamond-shaped mesh and (c) shows a chain insertion structure, respectively.

In addition, Figure 9 schematically shows the pile structure joining the upper and lower mesh layers (10, 12), (a) is a linear structure corresponding to Figure 6, (b) is an eight-shaped (C) shows a linear structure, (d) shows an 8-shaped cross structure, respectively.

Table 2 shows the physical properties of the materials 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 by 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.) of a structure in which a thin continuous filament of 100% polyurethane elastic fiber is laminated. When the thin film etc. which are called are used, the pad material 6 and the 3D net 16 are integrated, and when the seat cushion 2B is seated, the 3D net 16 does not feel a discomfort.

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

12 shows a modification of Embodiment 2, wherein the seat 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. The sheet cushion 2C has a structure in which the 3D net 16A is embedded in the lower portion of the pad member 6, so that only the upper surface of the 3D net 8 is covered with the sheet 18 during foaming, and the lower surface is not covered. .

13 shows another modified example of the second embodiment, and the sheet cushion 2D is formed of the urethane pad material 6 and the 3D net 16B disposed on the pad material 6. The sheet cushion 2D is covered with the sheet 18 only on the lower surface of the 3D net 8 at the time of foaming due to the configuration in which the 3D net 16B is disposed on the pad material 6 and the upper surface is not covered. Do not.

Fig. 14 shows a seat cushion 2E employing a cushion structure according to Embodiment 3 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 form the pad material 6. A 3D net 8 is embedded in the center.

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) are made to foam together with the urethane-based pad material 6, but as shown in Fig. 10 or 12, the pad material 6 In the configuration in which the 3D net 8 (16A) is embedded in the lower part of the), as shown in Figs. 15 to 17, the 3D net 8 is integrally foamed in a rectangular shape with the urethane pad material 20, A rectangular recess is formed in the lower part of the pad material 6 foamed in sheet form, and the pad material 20 can be embedded in this recess.

Instead of the configuration shown in Figs. 15 to 17, as shown in Figs. 18 to 20, the 3D net 16A can also be used in which the pad material 20 is integrally foamed in a rectangular shape.

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

All.

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 inside the 3D net 8.

FIG. 21 is a graph showing the static characteristics of the cushion structure in accordance with the present invention in which the 3D net of part number 09002D shown in Table 2 is employed 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 98 compression plates were obtained by compressing 24.8 mm at a rate of 50 mm / min. 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 FIG.

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 cushion characteristics showing the static characteristics of FIGS. 21 to 23 and the dynamic characteristics of the cushions made of urethane alone, and using a triaxial exciter, a random wave (random wave). obtained by inputting a wave) (test subject weight: 94 kg).

As can be seen from the graph of FIG. 25, the cushion structure in which urethane is impregnated into the 3D net has a large spring constant, and in particular, the cushion structure employing part number 09002D has a low damping characteristic in the high frequency region. It can cope with large loads and is excellent in attenuation of low frequency region. On the other hand, the cushion structure which does not impregnate a 3D net with urethane has a small spring constant as a whole, and is a structure corresponding to high frequency.

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

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 is embedded in the center part of a pad material. In one thing, the stroke amount can be adjusted by selection of a 3D net.

According to the present invention used as a three-dimensional mesh knit 3D net, the cushion structure 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 has a truss structure. It has the following features.

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

(2) By using the honeycomb shape memory function, it is possible to increase the resilience and not to deform easily.

(3) The truss structure can form a thin elastic structure that is difficult to deform, and can 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, For skinny and skinny people, low-pressure concentration of body pressure at the sciatic nodules, which are relatively insensitive to fatigue, prevents forwardward slipping. In addition, it is excellent in weight mobility, easy to change posture, easy to respond and decreases the shear shear force (shear force).

(5) The honeycomb truss structure does not make a hammock state (local pressure is concentrated and the side pressure from the side pressure edge is strong), and natural posture support is possible, and the honeycomb shaped parts Due to the elastic effect of the foreign matter (異 勿 感) is also reduced.

(6) When urethane is not impregnated, 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 with a large spring constant. have.

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 small cushion structure of 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 3D 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; and a pile layer having piles, wherein the three-dimensional net is foamed integrally with the pad material. The cushion structure according to claim 1, wherein the pad material is impregnated into the three-dimensional net. The method of claim 1, wherein the pad material impregnated sheet is covered with one layer of the upper and lower mesh layers to prevent the pad material from entering the interior of the three-dimensional net. Cushion structure. The cushion member according to claim 3, wherein a thermoplastic polyurethane elastomer sheet is used for 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.