JP7518436B2 - Vehicle seats - Google Patents

Description

The present invention relates to a vehicle seat equipped with a heater member.

Some vehicle seats have a sheet-shaped heater member between the cushion pad and the covering material that make up the seat cushion and seat back, allowing the seat to be heated. The heater member is composed of a sheet-shaped base material and a heater wire, which is an electric heating wire attached to the base material. The heater member is mostly placed on the surface of the cushion pad, and is inserted in a loop shape together with the covering material into the hanging groove formed on the surface of the cushion pad in the part that crosses the hanging groove.

JP 2014-36730 A

When the cushion pad is compressed from the surface side by an occupant sitting on it, the hanging groove is compressed in the depth direction. At this time, the heater member including the heater wire is compressed and bent together with the hanging groove in the direction along the surface of the base material. In order to suppress bending of the heater wire, it is possible to consider a method of inclining the heater wire with respect to the longitudinal direction of the base material (depth direction of the hanging groove), but if the heater wire is to be inclined to a certain extent, it must be made zigzag or corrugated due to the constraints imposed by the width of the base material. In this case, there is a problem in that stress is likely to concentrate at the folded-over portion of the heater wire when the heater member is compressed.

In view of the above background, the present invention aims to suppress stress concentration on a heater wire in a vehicle seat equipped with a heater member.

In order to solve the above problem, one aspect of the present invention includes a cushion pad (8) having a hanging groove (11) on its surface, a wire (20) provided below the hanging groove in the cushion pad, a skin material (9) provided on the surface of the cushion pad, a hanging member (35) provided on the back surface of the skin material and disposed in the hanging groove and engaged with the wire, and a sheet-like heater member (40) provided between the surface of the cushion pad and the skin material, the heater member having a sheet-like base material (41) and a heater wire (42) provided on the base material, and a heater wire (42) provided on the base material and the heater wire (42) are connected to the base material and the heater wire (42). The vehicle seat (1) is characterized in that the data wire enters the hanging groove, passes between the bottom of the hanging groove and the hanging member, and includes a crossing portion (48) that crosses the hanging groove, the heater wire extends in a zigzag shape in the crossing portion in a direction perpendicular to the extension direction of the hanging groove, and the bend in the zigzag shape avoids the opening side region (67) that is in the range from the opening end of the hanging groove to the surface of the hanging member on the opening end side of the hanging groove, and is arranged in the bottom side region (68) that is in the range from the bottom of the hanging groove to the surface of the hanging member on the opening end side of the hanging groove.

This configuration reduces stress concentration at the bent portion of the heater wire. When the surface side portion of the cushion pad deforms as an occupant sits on the seat, the bottom side region is supported by the hanging member and is less susceptible to deformation than the opening side region. Therefore, deformation is less likely to occur at the bent portion of the heater wire arranged in the bottom side region, and stress concentration at the bent portion is reduced.

In the above aspect, the heater wire may form an angle greater than 45° and less than 90° with respect to a direction perpendicular to the extension direction of the hanging groove at the crossing portion.

In this embodiment, the heater wire is inclined at the crossing portion, so deformation of the heater wire caused by compression of the crossing portion is reduced.

In the above aspect, it is preferable that two bent portions of the heater wire are arranged in the bottom region.

This aspect allows the distance between the bent portions of the heater wire to be shortened, and the width of the crossing portion to be reduced.

In the above embodiment, the hanging member may be a linear member extending in the longitudinal direction of the hanging groove, and may be connected to the tip of a pull-in cloth extending from the back surface of the skin material into the hanging groove.

According to this embodiment, the hanging member can be extended along the inside of the hanging groove, and deformation of the bottom side region can be reduced even more than that of the opening side region.

In the above embodiment, the bottom of the hanging groove may be formed with a plurality of protrusions (24) that contact the hanging member, and the crossing portion may pass through a recess (25) formed between the protrusions.

According to this aspect, the convex portion stabilizes the position of the hanging member and also forms a space through which the crossing portion passes.

In the above embodiment, a gap may be formed between the bent portion (65) of the cross section facing the bottom of the hanging groove and the bottom of the hanging groove.

According to this aspect, when the load of the occupant is applied to the cushion pad and the surface side portion of the cushion pad deforms, the crossing portion can escape to the bottom side of the hanging groove, suppressing deformation of the crossing portion.

In the above aspect, the distance between the bottom of the hanging groove and the hanging member may be greater than the thickness of the cross section.

This aspect avoids contact between the cross section and the hanging member and the bottom of the hanging groove.

In the above aspect, it is preferable that a gap is formed between the bent portion of the cross section facing the bottom of the hanging groove and the hanging member.

According to this aspect, when the load of an occupant is applied to the cushion pad and the surface side portion of the cushion pad deforms, contact between the crossing portion and the hanging member is suppressed, thereby suppressing deformation of the crossing portion.

In the above aspect, the cross section is narrower than the main body section (45, 46) that is placed on the surface of the cushion pad, and has an extension section (51) that expands the width at the connection section with the main body section, and the heater wire extends from the main body section through the extension section to the cross section.

According to this aspect, the heater wire extending in a straight line from the main body portion can be positioned at the center of the cross section, and the bent portion of the heater wire can be positioned in the bottom side region, avoiding the opening side region.

In the above embodiment, the side edges of the extension may be formed parallel to the heater wire.

This aspect allows the area of the expansion section to be minimized.

According to one aspect of the present invention, the bent portion of the heater wire is arranged in the bottom side region, avoiding the opening side region, thereby suppressing stress concentration at the bent portion of the heater wire.

In addition, in the above embodiment, by configuring the heater wire to form an angle greater than 45° and less than 90° with respect to the direction perpendicular to the extension direction of the hanging groove at the crossing portion, it is possible to reduce deformation of the heater wire caused by compression of the crossing portion.

In addition, in the above embodiment, by configuring the heater wire so that two bends are arranged in the bottom region, the distance between the bends of the heater wire can be shortened, thereby reducing the width of the cross section.

In addition, in the above embodiment, by configuring the hanging member to extend in the longitudinal direction of the hanging groove, deformation of the bottom side region can be reduced even more than that of the opening side region.

In addition, in the above embodiment, by forming a plurality of protrusions at the bottom of the hanging groove that come into contact with the hanging member, the protrusions can stabilize the position of the hanging member and also form a recess through which the crossing portion passes.

In addition, in the above embodiment, by forming a gap between the bent portion and the bottom of the cross section, when the surface side portion of the cushion pad deforms, the cross section can be moved to the bottom side of the hanging groove, thereby suppressing deformation of the cross section.

In addition, in the above embodiment, by configuring the distance between the bottom of the hanging groove and the hanging member to be greater than the thickness of the crossing portion, contact between the crossing portion and the hanging member and the bottom of the hanging groove can be avoided.

In addition, in the above embodiment, by forming a gap between the bent portion of the cross section and the hanging member, it is possible to suppress contact between the cross section and the hanging member when the surface side portion of the cushion pad deforms, thereby suppressing deformation of the cross section.

In addition, in the above embodiment, by configuring the heater wire to extend from the main body to the cross section by passing through an extension provided at the connection between the cross section and the main body, the heater wire extending in a straight line from the main body can be positioned at the center of the cross section, and the bent portion of the heater wire can be positioned in the bottom area, avoiding the opening area.

In addition, in the above embodiment, the area of the extension can be minimized by forming the side edges of the extension parallel to the heater wire.

FIG. 1 is a perspective view of a seat according to an embodiment; FIG. 2 is a plan view showing the positional relationship between a cushion pad and a heater member in the seat cushion; Cross-sectional view of the seat cushion (cross-sectional view taken along III-III in FIG. 2) FIG. 4 is a cross-sectional perspective view of the seat cushion (a cross-sectional perspective view taken along the line IV-IV in FIG. 2 ); Plan view of the heater member

Below, an embodiment of the vehicle seat of the present invention applied to an automobile seat will be described with reference to the drawings.

As shown in FIG. 1, the seat 1 has a seat cushion 5 that is attached to the vehicle floor 2 via slide rails 3, and a seat back 6 that is rotatably attached to the rear of the seat cushion 5. The seat cushion 5 is a seating portion that supports the occupant's buttocks and thighs from below, and the seat back 6 is a backrest portion that supports the occupant's back from behind.

The seat cushion 5 has a seat cushion frame (not shown) that forms the framework, a cushion pad 8 supported by the seat cushion frame, and a skin material 9 that covers the outer surface of the cushion pad 8.

The cushion pad 8 is made of a flexible resin material such as urethane foam. As shown in FIG. 2, a plurality of hanging grooves 11-13 are formed on the surface forming the upper surface of the cushion pad 8. The hanging grooves 11-13 are grooves that are recessed into the surface and extend in a predetermined direction. The hanging grooves 11-13 include a first hanging groove 11 that extends left and right in the center of the surface of the cushion pad 8, a second hanging groove 12 that extends left and right in the rear part of the surface of the cushion pad 8, and a pair of left and right front and rear hanging grooves 13 that extend front and rear on the left and right sides of the first hanging groove 11 and the second hanging groove 12.

The left and right ends of the first hanging groove 11 and the second hanging groove 12 are connected to the left and right front and rear hanging grooves 13. The surface of the cushion pad 8 is divided into a first central portion 15, a second central portion 16, a third central portion 17, and left and right side portions 18 by the first hanging groove 11, the second hanging groove 12, and the left and right front and rear hanging grooves 13. The first central portion 15 is the area in front of the first hanging groove 11 and between the left and right front and rear hanging grooves 13, the second central portion 16 is the area between the first hanging groove 11 and the second hanging groove 12 and between the left and right front and rear hanging grooves 13, the third central portion 17 is the area behind the second hanging groove 12, and the left and right side portions 18 are the areas outside the left and right front and rear hanging grooves 13. The first central portion 15, the second central portion 16, and the third central portion 17 are formed in a substantially planar shape.

As shown in Figures 3 and 4, a wire 20, which is a linear member made of a metal material or a resin material, is provided below each of the hanging grooves 11 to 13 in the cushion pad 8. The wire 20 extends along the longitudinal direction of the hanging grooves 11 to 13. The wire 20 can be placed in the cushion pad 8 by insert molding the cushion pad 8 with the wire 20 as a framework.

The first hanging groove 11 has a bottom 22 and a pair of side walls 23 extending substantially perpendicularly from both sides of the bottom 22. The bottom 22 has a number of protrusions 24 protruding toward the open end. The protrusions 24 are spaced apart from one another in the longitudinal direction of the first hanging groove 11. In the bottom 22, spaces are formed between the protrusions 24, which are defined by a number of recesses 25. Each protrusion 24 is connected to each side wall 23.

The cover material 9 of the seat cushion 5 and the seat back 6 is formed from, for example, woven fabric, leather, or synthetic leather. As shown in FIG. 3, the cover material 9 includes a plurality of sheet members 31, 32, and is formed by sewing together the edges of the sheet members 31, 32. The edges of the sheet members 31, 32 are sewn together in a state where they are overlapped so that their surfaces abut against each other, forming a sewn portion 33. Therefore, the sewn portion 33 protrudes from the back side of the sheet members 31, 32. A pull-in cloth 34 is sewn to the sewn portion 33.

The retracting cloth 34 is a belt-shaped member that extends along the sewn portion 33 and is sewn to the sewn portion 33 at one side edge. The suspending member 35 is connected to the other side edge (tip) of the retracting cloth 34. The suspending member 35 is a linear member that extends along the side edge of the retracting cloth 34. The linear suspending member 35 is also called a suspender cord. The suspending member 35 may extend continuously or intermittently along the side edge of the retracting cloth 34. The suspending member 35 is formed of a material that is more rigid than the retracting cloth 34, such as a resin material or a metal. The suspending member 35 may be connected to the retracting cloth 34 by, for example, gluing or welding. The suspending member 35 may also be connected to the retracting cloth 34 by being inserted into a hole formed in the retracting cloth 34. In this embodiment, the cross section of the suspending member 35 is formed to be approximately rectangular.

A number of fastening members (not shown), such as hooks, are provided at appropriate positions on the edges of the cover material 9. The cover material 9 is arranged to cover the surface of the cushion pad 8. The edges of the cover material 9 extend to the rear surface of the cushion pad 8 and are hooked by the fastening members to the seat cushion frame or a structure provided on the seat cushion frame.

As shown in FIG. 3, when the cover material 9 is placed on the cushion pad 8, the stitching portions 33 and the hanging grooves 11 to 13 are arranged to correspond to each other. The stitching portions 33, the pull-in cloth 34, and the hanging member 35 are arranged inside the hanging grooves 11 to 13, and the hanging member 35 extends in the longitudinal direction of the hanging grooves 11 to 13. FIG. 4 is a cross-sectional perspective view of the seat cushion, with the cover material 9 and the pull-in cloth 34 omitted. As shown in FIG. 4, the hanging member 35 is hooked to the wire 20 by the locking member 36. The locking member 36 may be, for example, a C-shaped clip that hooks onto the hanging member 35 and the wire 20, or a ring or cable tie that surrounds the hanging member 35 and the wire 20 together. The cover material 9 is fixed to the surface of the cushion pad 8 by hooking the hanging member 35 onto the wire 20.

The hanging member 35 comes into contact with the protruding ends of the protrusions 24, thereby determining the position of the hanging member 35 relative to the hanging grooves 11-13. The hanging member 35 comes into contact with the protrusions 24, thereby forming a gap between the hanging member 35 and the bottoms 22 of the hanging grooves 11-13. The gap is formed by the space defined by the recesses 25. The width of the hanging member 35 is smaller than the width of the hanging grooves 11-13, i.e., the distance between the two side walls 23. As a result, a gap is formed between the hanging member 35 and each side wall 23.

As shown in Figures 3 and 4, a sheet-shaped heater member 40 (seat heater) is provided between the surface of the cushion pad 8 and the cover material 9. As shown in Figure 5, the heater member 40 is a planar heating element having a sheet-shaped base material 41 and a heater wire 42 provided on the base material 41.

The substrate 41 is formed from a stretchable sheet-like member such as a nonwoven fabric or a woven fabric. The substrate 41 has a first body portion 45, a second body portion 46, and a third body portion 47 arranged in order along a predetermined first direction, at least one first cross portion 48 connecting the first body portion 45 and the second body portion 46, and at least one second cross portion 49 connecting the second body portion 46 and the third body portion 47. The substrate 41 including the first body portion 45, the second body portion 46, the third body portion 47, the first cross portion 48, and the second cross portion 49 is formed from a single continuous member. In this embodiment, two first cross portions 48 and two second cross portions 49 are provided.

The first body portion 45, the second body portion 46, and the third body portion 47 are formed in a rectangular shape, with long sides in a direction perpendicular to the first direction. In this embodiment, the first body portion 45 has both long and short sides longer than the second body portion 46, and the second body portion 46 has a short side longer than the third body portion 47.

The first transverse portion 48 and the second transverse portion 49 are formed in a band shape and extend in the first direction. The first transverse portion 48 is formed narrower than the first main body portion 45 and the second main body portion 46, and the second transverse portion 49 is formed narrower than the second main body portion 46 and the third main body portion 47. A first extension portion 51 that protrudes in a second direction perpendicular to the first direction is provided at the connection portion of the first transverse portion 48 with the first main body portion 45. The first extension portion 51 is formed in a triangle having a side edge (hypotenuse) inclined with respect to the first direction and is connected to the first transverse portion 48 and the first main body portion 45. Similarly, a second extension portion 52 that protrudes in a second direction perpendicular to the first direction is provided at the connection portion of the first transverse portion 48 with the second main body portion 46, and a third extension portion 53 that protrudes in a second direction perpendicular to the first direction is provided at the connection portion of the second transverse portion 49 with the second main body portion 46. The second extension 52 and the third extension 53 are formed into a triangle having side edges (hypotenuses) that are inclined with respect to the first direction.

The heater wire 42 is an electric heating wire that generates heat when electricity is applied, and is bonded to the surface of the substrate 41 by adhesion or the like. The heater wire 42 extends from a first terminal 56 provided at the rear end of the third body portion 47 through the third body portion 47, the second crossing portion 49, the second body portion 46, the first crossing portion 48, the first body portion 45, the first crossing portion 48, the second body portion 46, the second crossing portion 49, and the third body portion 47 in this order to a second terminal 57 provided at the rear end of the third body portion 47. In this embodiment, there are two heater wires 42, and they are connected in parallel between the first terminal 56 and the second terminal 57. The first terminal 56 and the second terminal 57 are connected to a harness that connects to a power source.

The heater wire 42 extends in the first direction while meandering in the second direction in the first body portion 45 and the second body portion 46. The heater wire 42 may meander in the first body portion 45 and the second body portion 46, forming, for example, a hairpin-shaped bend, and other portions may be parallel to each other.

The heater wire 42 extends in the first direction while meandering in the second direction in the first transverse portion 48 and the second transverse portion 49. In this embodiment, the heater wire 42 in the first transverse portion 48 is formed in a zigzag shape (wave shape) and has a plurality of straight portions 61 that extend at an angle to the first direction and a plurality of bent portions 62 provided between adjacent straight portions 61. Each straight portion 61 forms an angle with the first direction that is greater than 45° and less than 90°. More preferably, each straight portion 61 forms an angle with the first direction that is greater than 45° and less than 80°. The absolute values of the angles of each straight portion 61 with respect to the first direction may be equal to each other or may be different from each other.

The bent portions 62 of the heater wire 42 in the first transverse portion 48 and the second transverse portion 49 are preferably formed in an arc shape. In this embodiment, the bent portions 62 of the heater wire 42 in the first transverse portion 48 and the second transverse portion 49 are provided in two locations. Each of the bent portions 62 is disposed in the center of each transverse portion in the first direction. For example, each of the bent portions 62 may be disposed in the center portion obtained by dividing each transverse portion into three equal parts in the first direction.

The straight portion 61 of the heater wire 42 in the first cross section 48 located on the first body portion 45 side passes through the first extension portion 51 and extends from the first body portion 45 to the first cross section 48. The straight portion 61 of the heater wire 42 in the first cross section 48 located on the second body portion 46 side passes through the second extension portion 52 and extends from the first cross section 48 to the second body portion 46. This allows the heater wire 42 to extend linearly from the first body portion 45 and the second body portion 46 without forming bends 62 at both ends of the first cross section 48 in the first direction.

The side edge of the first expansion section 51 is formed parallel to the straight line portion 61 passing through the first expansion section 51. This allows the area of the first expansion section 51 to be minimized. Similarly, the side edge of the second expansion section 52 is formed parallel to the straight line portion 61 passing through the second expansion section 52.

The straight portion 61 of the heater wire 42 in the second cross section 49 that is located on the second body section 46 side passes through the third extension portion 53 and extends from the second body section 46 to the second cross section 49. This allows the heater wire 42 to extend in a straight line from the second body section 46 without forming a bent portion 62 at the end of the second cross section 49 on the second body section 46 side.

2, the heater member 40 is disposed on the surface of the cushion pad 8 such that the first body portion 45 is disposed on the first central portion 15, the second body portion 46 is disposed on the second central portion 16, and the third body portion 47 is disposed on the third central portion 17. For example, the first body portion 45 is adhered to the first central portion 15, the second body portion 46 is adhered to the second central portion 16, and the third body portion 47 is adhered to the third central portion 17 by double-sided tape. As shown in FIGS. 3 and 4, the first crossing portion 48 enters the first hanging groove 11 and crosses the first hanging groove 11 by passing between the bottom portion 22 of the first hanging groove 11 and the hanging member 35. The second crossing portion 49 enters the second hanging groove 12, passes between the bottom 22 of the second hanging groove 12 and the hanging member 35, and crosses the second hanging groove 12.

The first crossing portion 48 extends from the opening end of the first hanging groove 11 through the gap between the hanging member 35 and one of the side walls 23 toward the bottom 22, and passes between the hanging member 35 and the bottom 22 by entering the recess 25. The first crossing portion 48 forms a bent portion 65 that is bent 180° in an arc below the hanging member 35, and extends from the bent portion 65 through the gap between the hanging member 35 and the other side wall 23 toward the opening end. The first crossing portion 48 is not fixed to the side wall 23 of the first hanging groove 11, so it can slide in the height direction of the side wall 23. The first crossing portion and the hanging member 35 are offset from each other in the width direction of the cushion pad 8.

When the heater member 40 is provided on the surface of the cushion pad 8, the first direction of the heater member 40 is perpendicular to the extension direction of the first hanging groove 11. The heater wire 42 of the first cross section 48 extends in a zigzag shape in a direction perpendicular to the extension direction of the first hanging groove 11, and forms an angle greater than 45° and less than 90° with respect to the direction perpendicular to the extension direction of the first hanging groove 11.

In the first hanging groove 11, the range from the opening end to the surface (edge) on the opening end side of the hanging member 35 is the opening side region 67, and the range from the surface on the opening end side of the hanging member 35 to the bottom 22 is the bottom side region 68. Each of the bent portions 62 of the heater wire 42 in the first cross section 48 is disposed in the bottom side region 68, avoiding the opening side region 67. Also, each of the bent portions 62 of the heater wire 42 in the first cross section 48 may be disposed on the bottom 22 side of the surface (edge) on the bottom 22 side of the hanging member 35 in the bottom side region 68. In this embodiment, each of the two bent portions 62 of the heater wire 42 in the first cross section 48 is disposed in the bottom side region 68.

A gap is formed between the bent portion 65 of the first cross portion 48 and the bottom portion 22. That is, the bent portion 65 faces the bottom portion 22 with a gap therebetween. The width of the hanging member 35 is larger than the thickness of the first cross portion 48, and the distance between the bottom portion 22 and the hanging member 35 is set to be larger than the width of the hanging member 35. In addition, a gap is formed between the bent portion 65 of the first cross portion 48 and the hanging member 35.

The second cross section 49 is disposed in the second hanging groove 12. The detailed configuration of the second cross section 49 in the second hanging groove 12 is similar to the configuration of the first cross section 48 in the first hanging groove 11.

The seat back 6 has a seat back frame (not shown) that forms the framework, a cushion pad 71 supported by the seat back frame, a skin material 72 that covers the outer surface of the cushion pad 71, and a heater member 73 provided between the cushion pad 71 and the skin material 72. The configurations of the cushion pad 71, the skin material 72, and the heater member 73 in the seat back 6 are similar to the configurations of the cushion pad 8, the skin material 9, and the heater member 40 in the seat cushion 5.

The effect of the seat 1 configured as above will be described. When the seat cushion 5 receives a load due to an occupant sitting on the seat, the cushion pad 8 is compressed and deformed in the thickness direction. The first hanging groove 11 is compressed and deformed in the depth direction in response to the deformation of the cushion pad 8. At this time, the deformation amount of the first hanging groove 11 is larger in the opening side region 67 than in the bottom side region 68. This is because the bottom side region 68 is disposed farther from the surface side of the cushion pad 8 than the opening side region 67, and the hanging member 35 supports a load from the outside, making it difficult for the load to be transmitted to the side wall portion 23 that defines the bottom side region 68. In the seat 1, each crossing portion 48, 49 of the heater member 40 passes through the bottom side region 68 between the bottom portion 22 and the hanging member 35 in the corresponding hanging groove 11, 12 and crosses the hanging groove 11, 12, so that the load is not easily applied to the heater member 40, and deformation of the crossing portions 48, 49 is suppressed. This prevents deformation of the heater wire 42 at the cross sections 48 and 49, and prevents damage to the heater wire 42.

The bent portion 62 of the heater wire 42 at the cross sections 48 and 49 is located in the bottom side region 68, avoiding the opening side region 67, so stress concentration at the bent portion 62 is suppressed.

The straight portions 61 of the heater wire 42 at the cross sections 48, 49 are inclined at an angle greater than 45° and less than 90° with respect to the direction perpendicular to the extension direction of the hanging grooves 11, 12, so that deformation occurring in the straight portions 61 of the heater wire 42 due to compression of the cross sections 48, 49 can be reduced.

Since two bent portions 62 of the heater wire 42 are arranged in the bottom region 68, the distance between the bent portions 62 of the heater wire 42, i.e., the length of the straight portion 61, can be shortened. This allows the width of the transverse portions 48, 49 to be reduced, resulting in reduced material and costs.

Because a gap is formed between the bent portion 62 of the crossing portions 48, 49 and the bottom portion 22 of the hanging grooves 11, 12, when the surface side portion of the cushion pad 8 deforms, the crossing portions 48, 49 can slide toward the bottom portion 22 of the hanging grooves 11, 12 and escape. This makes it difficult for the crossing portions 48, 49 to deform.

The bent portions 62 of the cross sections 48, 49 are arranged with a gap between them and the hanging member 35, so that when the surface side portion of the cushion pad 8 deforms, contact between the cross sections 48, 49 and the hanging member 35 is suppressed, thereby suppressing deformation of the cross sections 48, 49.

Since the straight portion 61 of the heater wire 42 extends from the first main body portion 45 to the first cross portion 48 through the first extension portion 51, the straight portion 61 extending from the first main body portion 45 can be positioned at the center of the first cross portion 48 in the longitudinal direction (first direction), and the bent portion 62 of the heater wire 42 can be positioned in the bottom side region 68, avoiding the opening side region 67. The same effect is achieved for the second extension portion 52 and the third extension portion 53.

Although the specific embodiment has been described above, the present invention is not limited to the above embodiment and can be modified in a wide range of ways. For example, the first hanging groove 11 across which the first crossing portion 48 crosses may be configured as a groove extending forward and backward relative to the cushion pad 8.

1: Sheet 8: Cushion pad 9: Cover material 11: First hanging groove 12: Second hanging groove 13: Front and rear hanging grooves 20: Wire 22: Bottom 23: Side wall 24: Convex portion 35: Hanging member 36: Locking member 40: Heater member 41: Base material 42: Heater wire 45: First main body portion 46: Second main body portion 47: Third main body portion 48: First cross portion 49: Second cross portion 51: First extension portion 52: Second extension portion 53: Third extension portion 61: Straight portion 62: Bend portion 65 of heater wire at cross portion: Bend portion 67 of heater member (base material): Opening side region 68: Bottom side region

Claims (7)

A cushion pad with a hanging groove on the surface,
a wire provided below the hanging groove in the cushion pad;
A skin material provided on a surface of the cushion pad;
a hanging member provided on the back surface of the skin material, disposed in the hanging groove, and engaged with the wire;
a sheet-shaped heater member provided between a surface of the cushion pad and the cover material,
The heater member includes a sheet-like substrate and a heater wire provided on the substrate,
the substrate and the heater wire include a plurality of main body portions arranged in order in a first direction perpendicular to an extension direction of the hanging groove, and a plurality of crossing portions extending in the first direction and connected to the plurality of main body portions, each of which enters the hanging groove and crosses the hanging groove by passing between a bottom of the hanging groove and the hanging member,
The body portion includes a first body portion, a second body portion, and a third body portion,
the crossing portion includes two first crossing portions connecting the first body portion and the second body portion, and two second crossing portions connecting the second body portion and the third body portion,
a first opening is formed by two adjacent first crossing portions and the first body portion and the second body portion adjacent thereto , and a second opening is formed by two adjacent second crossing portions and the second body portion and the third body portion adjacent thereto,
Each of the first crossing portions has a width narrower than each of the first main body portion and the second main body portion arranged on the surface of the cushion pad, and has an extension portion that extends in width at a connection portion with the first main body portion ,
A first cutout portion is formed in an edge portion of the first body portion that forms the first opening,
A vehicle seat , wherein a length of each of the first crossing portions in a second direction perpendicular to the first direction is greater than a length of each of the second crossing portions in the second direction . 2. The vehicle seat according to claim 1, wherein the first cutout portion is formed in a triangular shape , and a length of the first opening in the second direction is greater than a length of the second opening in the second direction . 2. The vehicle seat according to claim 1, wherein in the first main body portion in which the first cutout is formed, the first cutout is provided in a central portion in the second direction , and the heater wire is provided on both sides in the second direction. The vehicle seat according to claim 3 , wherein a second notch is provided in an edge portion of the first main body portion opposite to the edge portion in the first direction where the first notch is provided. The vehicle seat according to claim 4 , wherein a third cutout portion is formed in an edge portion of the third main body portion opposite to a side of the first main body portion in the first direction. The vehicle seat according to claim 5 , wherein the first cutout portion, the second cutout portion, and the third cutout portion are arranged on an imaginary straight line extending in the first direction. The cushion pad is supported by a seat cushion frame to form a seat cushion,
A seat back is rotatably provided at the rear of the seat cushion,
7. The vehicle seat according to claim 1 , wherein the seat cushion is attached to a floor of the vehicle via a slide rail.

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