JP2024115296A - Seat pad and vehicle seat - Google Patents

Abstract

To suppress damage of cushion property.SOLUTION: A cushion pad 24 is formed by using a foam and includes a pad body 34 which deforms by being pressed by a seated crew member. Also, the cushion pad 24 includes a rigidity adjustment member 38 which is formed into a seat shape, is buried in a part opposite the side pressed against the seated crew member in the pad body 34, and increases rigidity of a part opposite the side pressed against the seated crew member in the pad body 34 more than rigidity of the part pressed against the seated crew member in the pad body 34.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seat pad and a vehicle seat.

The following Patent Document 1 discloses a seat cushion for a vehicle seat that has a foam pad and a frame that supports the pad. In the seat cushion described in this document, a cut is formed in the pad for pushing in and assembling the harness, eliminating the need for bands or clips to secure the harness.

JP 2010-89640 A

However, if the thickness of the pad is reduced due to space restrictions under the seat cushion, the cushioning properties of the pad may be compromised, but the configuration described in Patent Document 1 does not take this into consideration.

In consideration of the above, the present invention aims to provide a seat pad and a vehicle seat that can prevent the loss of cushioning properties.

The seat pad of the first embodiment is made of a foam and includes a pad body that is deformed when pressed by a seated occupant, and a rigidity adjustment member that is formed in a sheet shape and embedded inside a portion of the pad body opposite the side pressed by the seated occupant, and that increases the rigidity of the portion of the pad body opposite the side pressed by the seated occupant relative to the rigidity of the portion of the pad body on the side pressed by the seated occupant.

According to the seat pad of the first aspect, the stiffness adjustment member is embedded inside the portion of the pad body opposite the side pressed by the seated occupant. This makes the stiffness of the portion of the pad body opposite the side pressed by the seated occupant higher than the stiffness of the portion of the pad body on the side pressed by the seated occupant. This makes it possible to prevent the occupant from feeling that the pad body has bottomed out (feeling that the pad body has been completely crushed) when the occupant sits on the pad body or leans against it. In this way, the seat pad of the first aspect makes it possible to prevent the cushioning properties from being impaired.

The seat pad of the second aspect is a seat pad of the second aspect, in which the stiffness adjustment member is formed with a plurality of openings arranged at intervals from each other when viewed from the seated occupant side.

According to the second aspect of the seat pad, the rigidity of the portion of the pad body opposite the side pressed by the seated occupant can be easily adjusted by adjusting the size and arrangement of the multiple openings.

The seat pad of the third aspect is the seat pad of the first or second aspect, in which a sheet-shaped backing member is joined to the surface of the pad body opposite the side pressed by the seated occupant, and the stiffness adjustment member and the backing member are connected.

According to the third aspect of the seat pad, the stiffness adjustment member and the back surface member are connected. This makes it easy to position the stiffness adjustment member relative to the back surface member.

The vehicle seat of the fourth aspect includes a seat cushion that supports the buttocks of a seated occupant from below, and a seat back that supports the back of the seated occupant from the rear, and at least one of the seat cushion and the seat back is configured to include the seat pad of the first aspect.

The vehicle seat of the fourth aspect is configured to include the seat pad of the first aspect, which helps prevent loss of cushioning properties.

The seat pad and vehicle seat of the present invention have the excellent effect of preventing the loss of cushioning properties.

1 is a front view showing a vehicle seat according to a first embodiment of the present invention; 4 is a cross-sectional view showing a cross section of the cushion pad cut along the front-rear direction and the up-down direction. FIG. 4 is a cross-sectional view showing a cross section of the cushion pad taken along the left-right direction and the up-down direction. FIG. 4 is a plan view showing a schematic view of a stiffness adjustment member and a back surface member. FIG. 11 is a cross-sectional view showing a state in which a rigidity adjustment member and a back surface member are set in an upper mold. FIG. 10 is a cross-sectional view for explaining a manufacturing process of the cushion pad, showing a state in which the stiffness adjustment member and the back surface member are set in the upper mold and before the upper mold engages with the lower mold. FIG. 1 is a cross-sectional view for explaining a manufacturing process of the cushion pad, showing a process of filling a lower mold with a material for forming a pad body. FIG. 5A to 5C are cross-sectional views for explaining the manufacturing process of the cushion pad, showing a state in which the upper die is engaged with the lower die. 10 is a cross-sectional view for explaining the manufacturing process of the cushion pad, showing the step of removing the cushion pad from the lower mold. FIG. 10 is a cross-sectional view showing a cross section of a cushion pad of a vehicle seat according to a second embodiment taken along the left-right direction and the up-down direction. FIG. 11 is a cross-sectional view showing a state in which a rigidity adjustment member and a back surface member are set in an upper mold. FIG.

First Embodiment
A vehicle seat 10 according to a first embodiment of the present invention will be described with reference to Figures 1 to 9. Note that the arrows FR, UP, RH, and LH shown in the figures indicate the front, upper, right, and left sides of the seat as seen by an occupant seated in the vehicle seat 10, respectively. Hereinafter, when the directions of front-rear, up-down, and left-right are simply used in the description, they refer to front-rear in the front-rear direction of the seat, up-down in the up-down direction of the seat, and left-right in the left-right direction of the seat, unless otherwise specified. In addition, the left-right direction of the seat coincides with the width direction of the seat.

As shown in FIG. 1, the vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the buttocks of a seated occupant from below, a seat back 18 that supports the back of the seated occupant from the rear, and a headrest 20 that supports the head of the seated occupant from the rear.

The seat cushion 12 is configured such that the cushion pad assembly 22 is attached to a cushion frame (not shown) that forms the framework of the seat cushion 12.

The cushion pad assembly 22 includes a cushion pad 24 serving as a seat pad and a cushion trim 26 serving as a trim attached to the cushion pad 24.

The seat back 18 is configured such that the back pad assembly 28 is attached to a back frame (not shown) that forms the framework of the seat back 18.

The back pad assembly 28 includes a back pad 30 serving as a seat pad and a back trim 32 attached to the back pad 30.

Next, we will explain the detailed configuration of the cushion pad 24.

As shown in Figures 2 and 3, the cushion pad 24 is composed of a pad body 34 formed in a block shape of a specified shape and dimensions, a back member 36 joined to the underside of the pad body 34, and a stiffness adjustment member 38 embedded inside the pad body 34.

The pad body 34 is made of a foam such as polyurethane foam, and is designed to deform when pressed by a seated occupant. As shown in FIG. 3, the pad body 34 has a main portion 34A that constitutes the center in the seat width direction, and a pair of left and right side portions 34B that constitute both sides in the seat width direction. At the boundary between the main portion 34A and the pair of side portions 34B, a groove 34C that is open on the upper side is formed along the front-rear direction.

The back surface member 36 is formed using a nonwoven fabric such as felt formed into a sheet. This back surface member 36 is joined to the lower surface of the pad main body 34. In addition, the back surface member 36 has, as an example, four openings 36A (see FIG. 4).

The stiffness adjustment member 38 is formed of a nonwoven fabric such as felt formed into a sheet like the back member 36. The stiffness adjustment member 38 is embedded inside the part (vertical middle part 34D) of the main part 34A of the pad body 34 opposite the side pressed by the seated occupant. This makes the stiffness of the vertical middle part 34D of the pad body 34 higher than the stiffness of the upper part 34E of the pad body 34. In more detail, in the vertical middle part 34D of the pad body 34, the stiffness adjustment member 38 restricts deformation in the manner of being crushed in the vertical direction while spreading in the left-right and front-rear directions. In contrast, in the upper part 34E of the pad body 34, the stiffness adjustment member 38 does not restrict deformation in the manner of being crushed in the vertical direction while spreading in the left-right and front-rear directions.

As shown in FIG. 4, the stiffness adjustment member 38 has a rectangular shape when viewed from above. This stiffness adjustment member 38 has six openings 38A that are spaced apart when viewed from above. In this embodiment, the six openings 38A are arranged in three rows in the front-rear direction and two rows in the left-right direction. In addition, both left-right ends 38B of the stiffness adjustment member 38 are joined to the back surface member 36.

Next, we will explain the manufacturing method of the cushion pad 24.

As shown in Figures 5 and 6, the cushion pad 24 is manufactured using an upper mold 40 and a lower mold 42. The back surface member 36 and the stiffness adjustment member 38 are set in the upper mold 40. The upper mold 40 is provided with a plurality of first set pins 44 for maintaining the state in which the back surface member 36 is arranged along the upper mold 40. The upper mold 40 is also provided with a plurality of second set pins 46 for biasing the stiffness adjustment member 38 toward the lower mold 42. These second set pins 46 engage with the four corners 38C (see Figure 4) of the stiffness adjustment member 38, thereby maintaining a state in which most of the stiffness adjustment member 38 is separated from the back surface member 36.

7, the material 48 forming the pad body 34 is filled into the lower mold 42, and as shown in FIG. 8, the upper mold 40 with the back member 36 and the stiffness adjustment member 38 set therein is engaged with the lower mold 42. With the upper mold 40 engaged with the lower mold 42, foaming and resinification of the material 48 proceeds in the space formed between the upper mold 40 and the lower mold 42. After a set time has elapsed, the space formed between the upper mold 40 and the lower mold 42 is filled with the material 48 that has finished foaming and resinification, and the pad body 34 integrated with the back member 36 and the stiffness adjustment member 38 is formed. That is, the cushion pad 24 is formed. Next, as shown in FIG. 9, the upper mold 40 is separated from the lower mold 42, and the cushion pad 24 is removed from the lower mold 42.

Through the above steps, the cushion pad 24 is manufactured.

(Actions and Effects of the Present Embodiment)
Next, the operation and effects of this embodiment will be described.

As shown in Figures 1 to 3, according to the cushion pad 24 of the vehicle seat 10 of this embodiment described above, the stiffness adjustment member 38 is embedded inside the middle portion 34D in the vertical direction of the pad main body 34. This makes the stiffness of the middle portion 34D in the vertical direction of the pad main body 34 higher than the stiffness of the upper portion 34E of the pad main body 34. This makes it possible to prevent an occupant from feeling that the pad main body 34 has bottomed out (feeling that the pad main body 34 has been completely crushed) when sitting on the pad main body 34. In this way, according to the cushion pad 24 of this embodiment, it is possible to prevent the cushioning properties from being impaired.

As shown in FIG. 4, the stiffness adjustment member 38 is formed with a plurality of openings 38A spaced apart from one another when viewed from above. In this configuration, the stiffness of the vertical middle portion 34D of the pad body 34 can be easily adjusted by adjusting the size and arrangement of the plurality of openings 38A.

In addition, in this embodiment, both left and right end portions 38B of the stiffness adjustment member 38 are joined to the back surface member 36. This makes it easier to position the stiffness adjustment member 38 relative to the back surface member 36. As a result, the stiffness adjustment member 38 and the back surface member 36 can be set easily in the upper mold 40 (see FIG. 5). Note that when another configuration is used for positioning the stiffness adjustment member 38, the stiffness adjustment member 38 may not be joined to the back surface member 36.

(Cushion pad 50 of vehicle seat according to second embodiment)
Next, the cushion pad 50 of the vehicle seat of the second embodiment will be described. Note that, in the cushion pad 50 of the vehicle seat of the second embodiment, the members and parts corresponding to the cushion pad 24 of the vehicle seat 10 of the first embodiment are denoted by the same reference numerals as the members and parts corresponding to the cushion pad 24, and the description thereof may be omitted.

As shown in FIG. 10, the cushion pad 50 of this embodiment has the same configuration as the cushion pad 24 of the first embodiment, except that the rigidity of the lower portion 34F of the pad body 34 is increased by the rigidity adjustment member 38. In the cushion pad 50 of this embodiment, the rigidity of the lower portion 34F of the pad body 34 is higher than the rigidity of the upper portion 34E of the pad body 34 and the vertical middle portion 34D. As a result, in the cushion pad 50 of this embodiment, it is possible to prevent the cushioning properties from being impaired, similar to the cushion pad 24 described above.

Also, as shown in FIG. 11, in the manufacturing process of the cushion pad 50 of this embodiment, when the back surface member 36 is arranged along the upper mold 40, tension in the left-right direction is applied to the stiffness adjustment member 38. This keeps most of the stiffness adjustment member 38 separated from the back surface member 36. In this way, in the manufacturing process of the cushion pad 50 of this embodiment, it is possible to eliminate the need to provide the second set pin 46 (see FIG. 5) on the upper mold 40.

In each of the above-described embodiments, the configuration of the present invention is applied to the cushion pad 24 side, but the configuration of the present invention can also be applied to the back pad 30 side.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is of course possible to implement the invention in various other modified forms without departing from the spirit of the invention.

10 Vehicle seat 12 Seat cushion 18 Seat back 24 Cushion pad (seat pad)
30 Back pad (seat pad)
34 Pad body 36 Back surface member 38 Stiffness adjustment member 38A Opening

Claims (4)

a pad body formed using a foam material and deformed when pressed by a seated occupant;
a rigidity adjusting member formed in a sheet shape and embedded inside a portion of the pad main body opposite to a side pressed by the seated occupant, for increasing the rigidity of the portion of the pad main body opposite to the side pressed by the seated occupant relative to the rigidity of the portion of the pad main body pressed by the seated occupant;
Seat pad with. The seat pad according to claim 1, wherein the stiffness adjustment member has a plurality of openings arranged at intervals from each other when viewed from the seated occupant side. A sheet-shaped backing member is joined to a surface of the pad body opposite to a surface pressed by a seated occupant,
3. The seat pad according to claim 1, wherein the stiffness adjusting member and the back surface member are connected to each other. A seat cushion that supports the buttocks of a seated occupant from below;
A seat back that supports the back of a seated occupant from the rear side;
Equipped with
A vehicle seat, wherein at least one of the seat cushion and the seat back includes the seat pad according to claim 1.