JP2012035671A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat in which a urethane pad is integrally foamed at the rear side of a seat cover without deteriorating the performance of a heater.SOLUTION: The vehicle seat 1 includes: a bonded fabric 22 arranged at the rear side of a skin material 20; a heating element 24 which is arranged the rear side of the bonded fabric 22, and welded on the skin material 20 by the bonded fabric 22; and the urethane pad 12 which is integrally foamed at the rear side of the heating element 24. A first laminated sheet 26 is arranged between the heating element 24 and the urethane pad 12.

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat in which a urethane pad is integrally foamed on the back side of a seat cover.

  Conventionally, a vehicle seat provided with a heater inside a seat cushion and / or a seat back is already known. Here, Patent Document 1 below discloses a vehicle seat in which a nichrome wire is sewn on the back surface of a seat cover of a seat cushion. Thereby, a seat cushion can be warmed with a simple structure.

Japanese Utility Model Publication No. 5-21752

  However, in the technique of Patent Document 1 described above, when a urethane pad is integrally foamed on the back side of the seat cover and molded (hereinafter referred to as “integrated foam molding”), the urethane pad stock solution before foaming is nichrome. Since it penetrates to the periphery of the wire, heat generated from the nichrome wire may be blocked by the permeated stock solution. Thereby, since the urethane pad causes a heat insulating action, the performance of the heater may be deteriorated.

  An object of the present invention is to provide a vehicle seat capable of integrally foaming a urethane pad on the back side of a seat cover without deteriorating the performance of the heater. That is.

The present invention is for achieving the above object, and is configured as follows.
The invention according to claim 1 is an adhesive cloth disposed on the back side of the skin material, a heating element disposed on the back side of the adhesive cloth and welded to the skin material by the adhesive cloth, and integrally foamed on the back side of the heating element. And a urethane pad, wherein the first laminate sheet is disposed between the heating element and the urethane pad.
According to this configuration, even when the urethane pad is integrally foam-molded, the urethane stock solution before foaming does not penetrate to the periphery of the heating element. Therefore, the urethane pad does not cause a heat insulating action, and the performance of the heating element as a heater does not deteriorate.

The invention according to claim 2 is the vehicle seat according to claim 1, wherein the first laminate sheet and the heating element are integrated, and then the integrated heating element is attached. The first laminate sheet is welded to the skin material.
According to this configuration, the heating element can be arranged at a complicated position. For example, as will be described in the embodiment, the heating element can be arranged at a position in the seat cushion that extends from the top plate main portion to the left and right top plate side portions.

Further, the invention according to claim 3 is the vehicle seat according to any one of claims 1 to 2, wherein at least a portion where the first laminate sheet is not disposed is a skin material and urethane. A second laminate sheet is disposed between the pad and the pad.
According to this configuration, in the integral foam molding of the urethane pad, it is possible to prevent the urethane stock solution from being impregnated into the skin material, and as a result, it is possible to prevent the skin material from becoming hard.

FIG. 1 is an overall perspective view of a vehicle seat according to an embodiment of the present invention, and shows a state seen through a seat cushion. FIG. 2 is a plan view of the seat cushion of FIG. FIG. 3 is a diagram showing a manufacturing process of the seat cover of the seat cushion in FIG. FIG. 4 is a diagram showing a state after welding with an adhesive cloth in FIG. 3. FIG. 5 is a diagram showing a manufacturing process of the seat cushion in FIG. FIG. 6 is a diagram showing a step subsequent to FIG. FIG. 7 is a diagram for explaining the next step of FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG.

  Hereinafter, the form for implementing this invention is demonstrated using FIGS. In the following description, “driver's seat 1” will be described as an example of “vehicle seat”. In the following description, the terms “up”, “down”, “front”, “back”, “left”, and “right” refer to the directions of “up”, “down”, “front”, “back”, “left”, and “right” described in the above-described drawings. When up, down, front, back, left, right are shown.

  First, a schematic configuration of the driver's seat 1 according to the embodiment of the present invention will be described with reference to FIG. The driver seat 1 includes a seat cushion 2 and a seat back 3. The seat cushion 2 will be described in detail below. Since the seat back 3 may have a known configuration, a detailed description thereof will be omitted.

  The seat cushion 2 mainly includes a known cushion frame (not shown) that forms a skeleton thereof, a known urethane pad 12 that is assembled to the cushion frame in a covering manner, and a seat that covers the surface of the urethane pad 12. And a cover 14.

  Here, the structure and manufacturing method of the seat cover 14 will be described individually. First, the structure of the seat cover 14 will be described. As shown in FIGS. 3 to 4, the seat cover 14 is arranged in the order of the skin material 20, the known web-like adhesive cloth 22, the nichrome wire 24, and the known first laminate sheet 26 from the seating surface side. It is configured in a stacked state. Below, the skin material 20 and the nichrome wire 24 are demonstrated separately among these structural members (the skin material 20, the adhesive cloth 22, the nichrome wire 24, and the 1st laminate sheet 26).

  First, the skin material 20 will be described. The skin material 20 is a member that covers the surface of the seat cushion 2, and is composed of a genuine leather 20a that is a skin, a second laminated sheet 20b having low air permeability, and a nonwoven fabric 20c from the seating surface side.

  The second laminate sheet 20b and the first laminate sheet 26 described above can prevent the genuine leather 20a from being impregnated with the urethane stock solution in the molding of the urethane pad 12 described in detail later. In addition, since both of these laminate sheets 20b and 26 have low air permeability, it is possible to prevent the leather 20a from being impregnated with a stock solution of urethane. Further, the laminate sheet 26 can also prevent the surface of the urethane pad 12 from collapsing (being tattered).

  Next, the nichrome wire 24 will be described. The nichrome wire 24 has a nichrome 24b made of an alloy wound around the surface of a core member 24a, the surface of the wound nichrome 24b is covered with an insulator 24c, and the surface of the covered insulator is covered with a resin (not shown). It has a quadruple structure (FIG. 3 shows a state where the resin is melted). In the seat cushion 2, the nichrome wire 24 is disposed at a position that extends from the top plate main portion 2a to the left and right top plate side portions 2b, 2b (see FIGS. 1 and 2).

  Further, both ends of the nichrome 24b of the nichrome wire 24 are electrically connected to the power supply unit 28 assembled to the cushion frame. Thereby, since the nichrome 24b generates heat and becomes a heater, the seat cushion 2 can be warmed. The nichrome wire 24 corresponds to a “heating element” described in the claims. The seat cover 14 has such a structure.

  Next, a method for manufacturing the seat cover 14 will be described. First, it is a predetermined position (a position corresponding to the butt portion of the occupant) on the outer surface of the first laminate sheet 26 (the lower surface in FIG. 3 and the seating side surface) from the top plate main portion 2a described above. The nichrome wire 24 is hot-pressed on the left and right top plate side portions 2b and 2b. Then, since the resin of the nichrome wire 24 melts, the insulator 24c of the nichrome wire 24 is welded to a predetermined position (a position corresponding to the butt portion of the occupant) on the outer surface of the laminate sheet 26 (see FIG. 3).

  Next, the web-like adhesive cloth 22 is provided between the inner surface of the skin material 20 (the upper surface in FIG. 3 and the surface opposite to the seating side) and the outer surface of the first laminate sheet 26. The steam S is applied from the inner surface (surface opposite to the seating side) side of the first laminate sheet 26 toward the outer surface (seat side surface) of the skin material 20. Then, since the adhesive cloth 22 melts, the outer surface of the first laminate sheet 26 and the inner surface of the skin material 20 are welded in a fashion that sandwiches the nichrome wire 24 (see FIG. 4). The seat cover 14 is manufactured in this way.

  When the seat cover 14 is manufactured in this way, the nichrome wire 24 positioned on the front end side of the left and right top plate side portions 2b, 2b is also supported by the first laminate sheet 26. 12, the nichrome wire 24 can be reliably arranged also on the front end sides of the left and right top plate side portions 2b, 2b.

  Next, a method for forming the urethane pad 12 whose surface is covered by the above-described seat cover 14 will be described with reference to FIGS. First, the above-described seat cover 14 is disposed on the inner surface of the cavity 32 formed in the lower mold 30 of the seat cushion molding apparatus. Next, the seat cover 14 is sucked from a plurality of air inlets 34 formed on the inner surface of the cavity 32 (see FIG. 5). Accordingly, the seat cover 14 can be disposed along the inner surface of the cavity 32 without causing wrinkles or slack.

  Subsequently, the urethane undiluted solution is poured into the cavity 32 (inside the seat cover 14) while keeping this arrangement (see FIG. 6). Finally, the upper mold 40 of the seat cushion molding apparatus is closed, and the poured urethane stock solution is foamed (see FIG. 7). When this foaming is completed, the urethane pad 12 whose surface is covered with the seat cover 14 is completed. The urethane pad 12 is integrally foamed with the seat cover 14 in this way.

  When integrally foam-molded in this way, the suspended portion that becomes the boundary between the top plate main portion 2a of the seat cushion 2 and the left and right top plate side portions 2b and 2b, and the front and rear boundaries of the top plate main portion 2a Since the first laminate sheet 26 is hardly present in the suspended portion, the urethane pad 12 can be firmly joined to the skin material 20 (see FIG. 8).

  On the contrary, in these suspended portions, the six locations where the first laminate sheet 26 is present (six locations surrounded by a dotted line in FIG. 2) are firmly attached to the skin material 20 with the urethane pad 12. It cannot be joined (see FIG. 9). However, most of these suspended portions have no problem because they can be firmly joined as described above.

  The seat cushion 2 is manufactured by assembling the urethane pad 12 integrally molded in this way to the cushion frame. And the driver's seat 1 is comprised from the seat cushion 2 manufactured in this way, and the well-known seat back 3. FIG.

  The driver's seat 1 according to the embodiment of the present invention is configured as described above. According to this configuration, the first laminate sheet 26 is disposed between the nichrome wire 24 and the urethane pad 12. Therefore, even when the urethane pad 12 is integrally foam-molded on the back side of the seat cover 14, the urethane stock solution before foaming does not permeate around the nichrome wire 24. Therefore, the urethane pad 12 does not cause a heat insulating action, and the performance of the nichrome wire 24 as a heater does not deteriorate.

  Further, according to this configuration, the nichrome wire 24 in a state of being welded to the first laminate sheet 26 is welded to the skin material 20 in advance. Therefore, the nichrome wire 24 can be arranged even at a complicated arrangement position. For example, as described in the embodiment, in the seat cushion 2, the nichrome wire 24 can also be disposed at a position that extends from the top plate main portion 2a to the left and right top plate side portions 2b, 2b.

  Further, according to this configuration, the second laminate sheet 20 b is disposed between the skin material 20 and the urethane pad 12 even in the portion where the first laminate sheet 26 is not disposed in the seat cover 14. Has been. Therefore, in the integral foam molding of the urethane pad 12, it is possible to prevent the genuine leather 20a from being impregnated with the urethane stock solution, and as a result, it is possible to prevent the genuine leather 20a from becoming hard.

The contents described above are only related to one embodiment of the present invention, and do not mean that the present invention is limited to the above contents.
In the embodiment, “driver's seat 1” is described as an example of “vehicle seat”. However, the present invention is not limited to this, and it may be “passenger seat” or “rear seat”.

  In the embodiment, the configuration in which only the “seat cushion 2” is heated has been described. However, the present invention is not limited to this, and only the “seat back 3” may be heated. In that case, the nichrome wire 24 may be provided on the seat back 3 as the nichrome wire 24 is provided on the seat cushion 2. Of course, both “seat cushion 2” and “seat back 3” may be heated.

  Moreover, in the Example, the skin material 20 demonstrated the example which consists of a triple structure in order of the genuine leather 20a, the laminate sheet 20b, and the nonwoven fabric 20c. However, the present invention is not limited to this, and a triple structure may be formed in the order of the fabric, the laminate sheet 20b, and the nonwoven fabric 20c.

  Moreover, in the Example, the example which arrange | positions the nichrome wire 24 in the seat cushion 2 in the position which looks good from the top-plate main part 2a to the left-right top-plate side parts 2b and 2b was demonstrated. However, the present invention is not limited to this, and the nichrome wires 24 may be arranged independently on the top plate main portion 2a and the left and right top plate side portions 2b, 2b.

1 Vehicle seat (driver's seat)
14 Seat cover 20 Skin material 22 Adhesive cloth 24 Nichrome wire (heating element)
26 First laminate sheet

Claims (3)

An adhesive cloth arranged on the back side of the skin material,
A heating element disposed on the back side of the adhesive cloth and welded to the skin material by the adhesive cloth;
A vehicle seat having a urethane pad integrally foamed on the back side of the heating element,
A vehicle seat, wherein a first laminate sheet is disposed between a heating element and a urethane pad. The vehicle seat according to claim 1,
A vehicle seat characterized in that after the first laminate sheet and the heating element are integrated, the integrated first laminate sheet with the heating element is welded to the skin material. The vehicle seat according to any one of claims 1 and 2,
A vehicle seat, wherein a second laminate sheet is disposed between a skin material and a urethane pad at least in a portion where the first laminate sheet is not disposed.

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