Seat back

Abstract

This design suppresses a decrease in fit while also preventing large yaw moments from acting on the seated person. [Solution] The pad 5 is configured in a concave shape that is recessed towards the rear of the seat. Furthermore, the first pad portion 51 has a lower hardness than the second pad portion 52, and the front-to-rear dimension T of the seat increases as it approaches the edge of the seat in the width direction from the center of the seat. As a result, the seat back 1 suppresses the acting of a large yaw moment on the occupant, and the decrease in the sense of fit experienced by the occupant can be suppressed.

Description

Technical Field

[0001] The present disclosure relates to a seat back of a vehicle seat

Background Art

[0002] For example, the seat cushion described in Patent Document 1 includes a cushion pad having a three-layer structure with a low-rebound and low-height seating upper part, a high-rebound and high-hardness seating lower part, and a flexible partition material disposed between the seating upper part and the seating lower part

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a vehicle such as a car turns, a yaw moment that tilts the seating posture acts on the seated person. The present disclosure discloses an example of a seat back in view of this point. Note that the above "yaw moment" refers to a moment around a vertical axis passing through the center of gravity of the human chest

Means for Solving the Problems

[0005] The seat back of a vehicle seat mounted on a vehicle is, for example, a pad (5) for a cushion disposed between an outer skin constituting a top plate portion and a back frame (39), and includes a first pad portion (51) located on the outer skin side and a second pad portion (52) located on the back frame (39) side of the first pad portion (51). It is desirable to provide a pad (5) having

[0006] Furthermore, the pad (5) is configured in a concave shape that is recessed towards the rear of the seat, and it is desirable that the first pad portion (51) has less hardness than the second pad portion (52), and that the front-to-rear dimension (T) of the seat increases as it approaches the edge of the seat in the width direction from the center of the seat in the width direction.

[0007] As a result, the seatback can suppress the large yaw moment acting on the occupant, and the decrease in the sense of fit the occupant experiences can also be suppressed. The seatback may also have the following configuration, for example:

[0008] In other words, it is desirable that the interface (53) between the first pad portion (51) and the second pad portion (52) be a flat shape without any irregularities. Furthermore, it is desirable that the interface (53) be a surface parallel to the sheet width direction.

[0009] Incidentally, the symbols in each of the parentheses above are just examples showing the correspondence with the specific configurations etc. described in the embodiments described later, and this disclosure is not limited to the specific configurations etc. indicated by the symbols in the parentheses above. [Brief explanation of the drawing]

[0010] [Figure 1] This is a diagram showing the seat back according to the first embodiment. [Figure 2] This figure shows the seat back pad structure according to the first embodiment. [Modes for carrying out the invention]

[0011] The following "Embodiments of the Invention" are examples of embodiments that fall within the technical scope of this disclosure. In other words, the features defining the invention as described in the claims are not limited to the specific configurations and structures shown in the embodiments below.

[0012] This embodiment is an example in which the seat back according to this disclosure is applied to a seat installed in a vehicle (hereinafter referred to as a vehicle seat). The seat back is a part that supports the back of the seated person.

[0013] The arrows and diagonal lines indicating direction in each figure are included to facilitate understanding of the relationships between the figures and the shapes of the components or parts. Therefore, the seat back is not limited to the direction indicated in each figure.

[0014] The directions shown in each figure represent the directions when the vehicle seat according to this embodiment is assembled to a vehicle. Diagrams with diagonal lines do not always indicate a cross-sectional view. At least one of the members or parts described with reference numerals is provided, unless otherwise specified as "one".

[0015] In other words, unless otherwise specified, such as "one," there may be two or more such members. The seat back shown in this disclosure comprises at least one of the components, such as members or parts, that are indicated by reference numerals, and at least one of the structural parts shown.

[0016] (First Embodiment) <1. Overview of Vehicle Seats> The seat back 1 shown in Figure 1 comprises at least a back frame 3 (see Figure 1), a pad 5 (see Figure 2), and a surface covering (not shown). The back frame 3 is a structural member that constitutes the frame of the seat back 1.

[0017] As shown in Figure 1, the back frame 3 includes at least a frame 35 and a support portion 36. The frame 35 is a metal member configured in a rectangular frame shape. Specifically, the frame 35 has two side frames 31 and 32, an upper frame 33 and a lower frame 34, etc.

[0018] The side frame 31 is a member that is arranged on one end side in the sheet width direction and extends substantially in the vertical direction. The side frame 32 is a member that is arranged on the other end side in the sheet width direction and extends parallel to the side frame 31.

[0019] The upper frame 33 is a member that extends in the sheet width direction and connects the upper end sides of the side frames 31 and 32. The lower frame 34 is a member that extends in the sheet width direction and connects the lower end sides of the side frames 31 and 32. Note that the upper frame 33 and the lower frame 34 are joined to the side frames 31 and 32 by welding.

[0020] The receiving part 36 is a part that receives inertial forces and the like acting on the seated person. The receiving part 36 is supported by the frame 35. Specifically, the receiving part 36 has at least support wires 37, 38 and a support plate 39 and the like.

[0021] The support wires 37, 38 are wire materials made of metal whose one end side and the other end side in the extending direction are connected to the frame 35, and are members that function as springs. The support plate 39 is a resin panel material that receives the backward load acting on the top plate part, that is, inertial forces and the like acting on the seated person.

[0022] Note that the top plate part is a part that is located between the side frame 31 and the side frame 32 in the skin and is a part that the back of the seated person contacts. That is, the top plate part is a part that contacts the back of the seated person from the rear side and supports the back.

[0023] The skin is a member that constitutes the surface of the seat back 1. The skin is made of a fabric such as a textile, natural leather, synthetic leather, or the like. And, as shown in FIG. 2, a pad 5 is arranged between the skin constituting the top plate part and the back frame (in this embodiment, the support plate 39).

[0024] <2. Details of the Pad> The pad 5 is an elastically deformable cushioning material such as polyurethane. As shown in Figure 2, the pad 5 is configured in a concave shape that is recessed on the rear side of the seat. The pad 5 is configured to have at least a first pad portion 51 and a second pad portion 52, etc.

[0025] The first pad portion 51 is a cushioning material located on the surface side of the top plate. The second pad portion 52 is a cushioning material located on the support plate 39 side of the first pad portion 51. The hardness of the first pad portion 51 is less than the hardness of the second pad portion 52.

[0026] Furthermore, the front-to-back dimension T of the portion of the first pad portion 51 corresponding to the top plate portion (the shaded area in Figure 2) increases as it approaches the edge of the sheet in the width direction, rather than from the center of the sheet. The interface 53 between the first pad portion 51 and the second pad portion 52 has a flat shape without any irregularities.

[0027] The interface 53 is composed of a surface that is substantially parallel to the sheet width direction. The configuration of the pad 5 is identical on both sides of the center line CL. In other words, the dimension T increases as you move from the center in the sheet width direction towards the right and left ends.

[0028] <3. Features of the seatback according to this embodiment> The pad 5 according to this embodiment is configured as a recessed shape that is indented on the rear side of the seat. As a result, the top surface is shaped to conform to the shape of the seated person's back, which can help prevent the seated person from experiencing a decrease in fit (discomfort).

[0029] Furthermore, the first pad portion 51 has a lower hardness than the second pad portion 52, and the front-to-rear dimension T of the first pad portion 51 increases as it approaches the edge of the sheet width from the center of the sheet width.

[0030] This can reduce the discrepancy between the "inertial force acting on the center of gravity of the human chest in the seat width direction" and the "restraining force exerted by the seat back 1 on the seated person in the seat width direction." As a result, a large yaw moment acting on the seated person can be suppressed.

[0031] The term "restraining force" refers to the resultant force of the forces generated at the contact point between the seat back 1 and the seated person, and is a force opposite to the inertial force mentioned above. Specifically, this restraining force is the resultant force of "the force generated at the contact point between the top plate and the seated person," and "the force generated at the contact point between the wall-like embankment 54 (see Figure 2) provided on the seat width end side of the top plate and the seated person," etc.

[0032] (Other embodiments) In the embodiment described above, the interface 53 between the first pad portion 51 and the second pad portion 52 had a flat shape without irregularities. However, the disclosure is not limited thereto. That is, the disclosure may, for example, have an interface with irregularities.

[0033] In the embodiments described above, the interface 53 was configured as a surface substantially parallel to the sheet width direction. However, the disclosure is not limited thereto. That is, the disclosure may, for example, configure the interface 53 to be inclined with respect to the sheet width direction.

[0034] In the embodiment described above, the first pad portion 51 and the second pad portion 52 were joined at the interface 53. However, the disclosure is not limited thereto. That is, the disclosure may also include, for example, a configuration in which the first pad portion 51 and the second pad portion 52 are integrally molded.

[0035] In the above-described embodiment, the pad 5 in the portion corresponding to the top plate was configured to receive inertial force from the support plate 39. However, this disclosure is not limited to this. That is, the disclosure may also be configured in which the inertial force is received by an elastic body such as a support wire.

[0036] In the embodiments described above, both the first pad portion 51 and the second pad portion 52 were made of polyurethane. However, this disclosure is not limited to the above, as it is sufficient if the hardness of the first pad portion 51 and the hardness of the second pad portion 52 are different.

[0037] In the embodiment described above, the first pad portion 51 and the second pad portion 52 were adjacent to each other and in contact. However, the disclosure is not limited thereto. That is, the disclosure may also include a configuration in which, for example, a third pad portion is provided between the first pad portion 51 and the second pad portion 52.

[0038] In the embodiment described above, the dimensions in the front-to-back direction of the portion of the second pad portion 52 corresponding to the top plate portion were the same. However, this disclosure is not limited thereto. That is, the disclosure may, for example, have a configuration in which such dimensions vary in the sheet width direction.

[0039] In the embodiments described above, the vehicle seat according to this disclosure was applied to a vehicle. However, the application of the invention disclosed herein is not limited to this. That is, the disclosure can be applied, for example, to seats used in vehicles such as railway cars, ships and aircraft, as well as to stationary seats used in theaters, homes, etc.

[0040] Furthermore, this disclosure is not limited to the embodiments described above, but is sufficient to be consistent with the intent of the disclosures described in the embodiments described above. Therefore, it may be a configuration in which at least two of the embodiments described above are combined, or a configuration in which any of the illustrated components or components described with reference numerals in the embodiments described above are omitted. [Explanation of Symbols]

[0041] 1… Seat back 3… Back frame 5… Pad 39… Support plate (back frame) 51… First pad section 52… Second pad section

Claims

1. In the seat back of a vehicle seat installed in a vehicle, A cushioning pad positioned between the surface covering and the back frame of the top panel, comprising a first pad portion located on the surface covering side and a second pad portion located on the back frame side of the first pad portion, The aforementioned pad is configured in a recessed shape that is indented on the rear side of the seat. Furthermore, the first pad portion has a lower hardness than the second pad portion, and the seat back has a front-to-back dimension that increases as it approaches the edges in the seat width direction from the center in the seat width direction.

2. The seat back according to claim 1, wherein the interface between the first pad portion and the second pad portion has a flat shape without irregularities.

3. The seat back according to claim 2, wherein the interface is a surface parallel to the seat width direction.

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