Seat back pad and vehicle seat

Abstract

The invention relates to a seat back cushion and a seat for a vehicle. A seat back cushion constitutes a cushion member of a seat back of a vehicle seat, and is covered with a seat back skin. In the seat back cushion, a plurality of grooves extending in the left-right direction of the seat are formed in the up-down direction of the seat on the back surface of the lower part opposite to a lumbar support device carried on the seat back.

Description

Technical Field

[0001] The present disclosure relates to a vehicle seat, and more particularly to a seat back pad as a pad member of a seat back. Background Art

[0002] Japanese Utility Model Application Laid-Open No. 64-15556, Japanese Utility Model Application Laid-Open No. 63-42258, and Japanese Utility Model Application Laid-Open No. 59-132557 disclose a vehicle seat equipped with a lumbar support device on a seat back. The seat back has a seat back cushion as a cushion member and a surface covering the seat back cushion. The lumbar support device is arranged on the rear side of the seat with respect to the seat back cushion, and the support force of the occupant's lumbar is adjusted by pushing the lower part of the seat back cushion toward the front of the seat. As a result, the comfort of the occupant can be improved regardless of the body shape of the occupant.

[0003] The above prior art has the following problems: the seat back cushion and the surface become resistance, narrowing the working range of the lumbar support device. In particular, the deformation resistance of the surface at the lower end of the seat back is large, so it is difficult to fully lower the support position of the occupant's waist. Summary of the invention

[0004] The present disclosure has been made in consideration of the above-mentioned facts, and an object thereof is to obtain a seat back pad and a vehicle seat capable of expanding the operating range of a lumbar support device.

[0005] A seat back cushion according to a first aspect of the present disclosure constitutes a cushion member of a seat back of a vehicle seat, and the seat back is covered with a skin, wherein a plurality of grooves extending in a left-right direction of the seat are arranged in a seat up-down direction on a back surface of a lower portion opposite to a lumbar support device mounted on the seat back.

[0006] The seat back pad of the first aspect constitutes a pad member of a seat back of a vehicle seat and is covered with a skin. In the seat back pad, a plurality of grooves extending in the left-right direction of the seat are arranged in a row in the seat up-down direction on the back surface of the lower portion facing the lumbar support device mounted on the seat back. As a result, the deformation resistance of the seat back pad during the operation of the lumbar support device is reduced, so that the operating range of the lumbar support device can be expanded.

[0007] The seat back pad of the second aspect is configured such that, in the first aspect, the width of the plurality of grooves in the seat vertical direction increases toward the seat rear side.

[0008] According to the second aspect, the width of the plurality of grooves formed on the back surface of the lower portion of the seat back pad in the seat vertical direction increases toward the rear side of the seat. Thus, when the lower portion of the seat back pad is greatly pushed forward to the front side of the seat by the lumbar support device, the plurality of grooves are not easily closed. As a result, the effect of reducing the deformation resistance of the seat back pad is easily maintained.

[0009] As for the seat back cushion of the third scheme, in the first scheme or the second scheme, it has: a cushion main body, which is arranged in the central part of the seat back in the left-right direction of the seat; and left and right cushion side parts, which are arranged on both side parts of the seat back in the left-right direction of the seat, and left and right recesses are formed at both ends in the left-right direction of the seat on the back side of the lower part of the cushion main body, which are recessed toward the front side of the seat, and the multiple grooves are formed on the back side of the lower part of the cushion main body, and the two ends of the multiple grooves in the left-right direction of the seat are open to the left and right recesses.

[0010] The seat back cushion of the third scheme comprises: a cushion main body, which is arranged at the center of the seat back in the left-right direction of the seat; and left and right cushion side parts, which are arranged at both sides of the seat back in the left-right direction of the seat. Left and right recesses that are recessed toward the front side of the seat are formed at both ends of the back side of the lower part of the cushion main body in the left-right direction of the seat. Both ends of the plurality of grooves formed on the back side of the lower part of the cushion main body in the left-right direction of the seat are open to the left and right recesses. As a result, the deformation resistance of the cushion main body when the lower part of the cushion main body is pushed toward the front side of the seat by the lumbar support device can be reduced within the range of both ends of the cushion main body in the left-right direction of the seat.

[0011] The vehicle seat of the fourth scheme comprises: a seat cushion for a vehicle occupant to sit on; a seat back to support the back of the occupant; and a lumbar support device mounted on the seat back, wherein the cushion member of the seat back is composed of the seat back cushion of any one of the first to third schemes.

[0012] In the vehicle seat of the fourth embodiment, a vehicle occupant sits on the seat cushion, and the occupant's back is supported by the seat back. The seat back is equipped with a lumbar support device. The cushion member of the seat back is composed of the seat back cushion of any one of the first to third embodiments, so the above-mentioned effect can be obtained.

[0013] Effects of the Invention

[0014] As described above, in the seat back pad and the vehicle seat of the present disclosure, the operating range of the lumbar support device can be expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Hereinafter, the specific embodiments of the present invention will be described in detail based on the following drawings, wherein:

[0016] Figure 1 It is a side view showing the vehicle seat according to the embodiment.

[0017] Figure 2 It is a perspective view showing a seat back pad of a vehicle seat according to the embodiment.

[0018] Figure 3 is a longitudinal sectional view of a seat back cushion according to an embodiment, corresponding to the Figure 2 A cross-sectional view of the F3-F3 line.

[0019] Figure 4 The lower portion of the seat back cushion of the embodiment is pushed out by the lumbar support device. Figure 3 sectional view of .

[0020] Figure 5 It is a perspective view showing a seat back pad of a vehicle seat according to a comparative example.

[0021] Figure 6 is a longitudinal sectional view of a seat back pad of a comparative example, corresponding to the Figure 5 A cross-sectional view of the F6-F6 line.

[0022] Figure 7 The figure shows the state in which the lower part of the seat back cushion of the comparative example is pushed out by the lumbar support device, corresponding to Figure 6 sectional view of . DETAILED DESCRIPTION

[0023] Below, refer to Figure 1 to Figure 7 A vehicle seat 10 according to an embodiment of the present disclosure is described. It should be noted that in each figure, some of the reference numerals are sometimes omitted for ease of viewing. In addition, arrows FR, LH, and UP appropriately recorded in each figure indicate the front, left, and top of the vehicle seat 10, respectively. In the following, when only the front, back, left, right, up, and down directions are used for description, directions relative to the vehicle seat 10 are indicated.

[0024] like Figure 1 As shown, the vehicle seat 10 of this embodiment includes: a seat cushion 12 for a vehicle occupant to sit on; a seat back 14 for supporting the back of the occupant; and a headrest 16 for supporting the head of the occupant. The seat back 14 includes: a frame (not shown) as a skeleton member; a seat back cushion 20 (see Figure 2 ), as a cushion member attached to the frame; a seat back skin 26, as a skin covering the seat back cushion 20; a seat back spring (elastic body) not shown, mounted on the frame and elastically supporting the seat back cushion 20 from the rear; and a lumbar support device 28, mounted on the seat back spring.

[0025] The seat back pad 20 is made of a foam such as polyurethane foam. Figure 2 As shown, the seat back pad 20 includes a pad body 20A disposed at the left-right center of the seat back 14 and left and right pad side portions 20B disposed at both left-right sides of the seat back 14. The entire periphery of the seat back pad 20 is covered by a seat back cover 26.

[0026] Left and right recessed portions 22 that are recessed toward the front are formed at both ends of the back surface of the lower portion of the pad body 20A in the left and right directions. In addition, on the back surface of the lower portion of the pad body 20A, a plurality of (here, five) grooves 24 extending in the left and right directions are formed at approximately equal intervals in the up-down direction. Both ends of the plurality of grooves 24 in the left and right directions are open to (communicated with) the left and right recessed portions 22. In addition, as shown in FIG. Figure 3 As shown, the width (groove width) of the plurality of grooves 24 in the vertical direction increases toward the rear side, and has a substantially wedge shape when viewed in the left-right direction.

[0027] The plurality of grooves 24 are opposed to a lumbar support device 28 disposed at the rear of the cushion body 20A. The lumbar support device 28 includes an upper lift portion 30 disposed at the middle portion of the seat back 14 in the vertical direction, and a lower lift portion 32 disposed at the lower end portion of the seat back 14. The left and right ends of the upper lift portion 30 and the lower lift portion 32 are respectively engaged with a pair of left and right guide wires 34 (the left guide wire 34 is omitted in the figure) in a slidable manner. The left and right guide wires 34 are supported by the frame of the seat back 14.

[0028] A pair of left and right arch forming parts 36 are provided between the upper lifting part 30 and the lower lifting part 32. The left and right arch forming parts 36 are made of a metal plate or a resin plate with elasticity in a strip shape with the vertical direction as the longitudinal direction, and are curved in an arc shape convex to the front when viewed in the left and right direction. The upper lifting part 30, the lower lifting part 32, and the left and right arch forming parts 36 are provided so as to be able to be lifted and lowered integrally in the vertical direction by a lifting mechanism (not shown) provided in the lumbar support device 28. The lifting mechanism is provided, for example, as a feed screw mechanism.

[0029] In addition, the upper lifting part 30 and the lower lifting part 32 are configured to be able to separate and move in the vertical direction from each other by an arch deformation mechanism (not shown) provided in the lumbar support device 28. The arch deformation mechanism is configured, for example, as a feed screw mechanism, and is configured to separate and move the upper lifting part 30 relative to the lower lifting part 32 by operation. When the upper lifting part 30 approaches the lower lifting part 32, the curvature of the curve of the left and right arch forming parts 36 becomes larger, and the middle part of the arch forming part 36 in the vertical direction protrudes forward. As a result, the lower part of the cushion body 20A is pushed forward together with the seat back cover 26. When the upper lifting part 30 moves away from the lower lifting part 32, the curvature of the curve of the left and right arch forming parts 36 becomes smaller, and the middle part of the left and right arch forming parts 36 in the vertical direction retreats to the rear side. As a result, the cushion body 20A and the seat back cover 26 are configured to elastically return to their original state. Note that a plate member 38 made of resin, such as a so-called basket, is interposed between the left and right arch forming portions 36 and the pad body portion 20A.

[0030] Next, the operation and effects of this embodiment will be described.

[0031] In the vehicle seat 10 having the above-described structure, the seat back pad 20 constituting the cushion member of the seat back 14 is covered with a seat back cover 26. In the seat back pad 20, a plurality of grooves 24 extending in the left-right direction are arranged in the up-down direction on the back surface of the lower portion facing the lumbar support device 28 mounted on the seat back 14. As a result, the deformation resistance of the seat back pad 20 during the operation of the lumbar support device 28 is reduced, so that the operating range of the lumbar support device 28 can be expanded.

[0032] use Figure 5 to Figure 7 The comparative example shown here is used to supplement the above-mentioned effect. In this comparative example, the plurality of grooves 24 are not formed in the seat back pad 20, but the other configurations are the same as those of the present embodiment. In this comparative example, when the lumbar support device 28 is in operation, the seat back pad 20 and the seat back cover 26 become resistance, and the operating range (adjustment range) of the lumbar support device 28 becomes narrow. Specifically, in the lower part of the seat back pad 20, the excess thickness is gathered on the back side pushed by the lumbar support device 28 (refer to Figure 7 The seat back cushion 20A is prevented from deforming due to the deformation of the cushion body 20A, thereby hindering the forward push of the seat back cushion 20. In addition, at the lower end side of the seat back 14, the deformation resistance of the seat back surface 26 is large, so the tendency of the working range of the lumbar support device 28 to be narrowed becomes stronger. Therefore, even if the upper lifting part 30, the lower lifting part 32 and the left and right arch forming parts 36 are lowered by the lifting mechanism, it is difficult to lower the support position of the seat back cushion 20 for the occupant's waist ( Figure 7 The lumbar support device 28 becomes difficult to be displaced in the direction of arrow B).

[0033] In contrast, in the present embodiment, a plurality of grooves 24 are formed on the back surface of the lower portion of the seat back pad 20. Therefore, when the lower portion of the seat back pad 20 is pushed forward by the lumbar support device 28, the accumulation of the excess thick portion on the back surface is reduced, and the deformation resistance of the seat back pad 20 is reduced. As a result, the seat back pad 20 is easily deformed, and the operating range of the lumbar support device 28 can be expanded downward (see FIG. 2 ). Figure 4 As a result, the support position of the occupant's waist by the seat back pad 20 can be sufficiently lowered, and the occupant's posture retention can be improved.

[0034] Furthermore, in the present embodiment, the width of the plurality of grooves 24 formed on the back surface of the lower portion of the seat back pad 20 in the vertical direction gradually increases toward the rear side. Thus, when the lower portion of the seat back pad 20 is greatly pushed forward by the lumbar support device 28, the plurality of grooves 24 are not easily closed. As a result, the effect of reducing the deformation resistance of the seat back pad 20 is easily maintained.

[0035] In addition, in the present embodiment, the seat back pad 20 includes a pad main body 20A disposed at the left-right center of the seat back 14, and left and right pad side parts 20B disposed at both left-right side parts of the seat back 14. Left and right recessed parts 22 that are recessed forward are formed at both left and right ends of the back surface of the lower part of the pad main body 20A. Both left and right ends of the plurality of grooves 24 formed on the back surface of the lower part of the pad main body 20A are open to the left and right recessed parts 22. Thus, the deformation resistance of the pad main body 20A when the lower part of the pad main body 20A is pushed forward by the lumbar support device 28 can be reduced within the range of both left and right ends of the pad main body 20A.

[0036] In the above embodiment, both ends of the plurality of grooves 24 in the left and right directions are open to the left and right recesses 22 , but the present invention is not limited thereto and the seat back pad 20 may be provided without the left and right recesses 22 .

[0037] Furthermore, in the above-described embodiment, the configuration in which the vertical width of the plurality of (five) grooves 24 increases toward the rear side is adopted, but the present invention is not limited thereto, and the shape and number of the plurality of grooves 24 may be appropriately changed.

[0038] In addition, the present disclosure can be variously modified within the scope not exceeding the gist thereof. In addition, the scope of rights of the present disclosure is of course not limited to the above-mentioned embodiments.

Claims

1. A seat back pad constituting a cushion member of a seat back of a vehicle seat and covered with a skin, wherein: A plurality of grooves extending in a seat left-right direction are formed in a row in a seat up-down direction on a back surface of a lower portion facing a lumbar support device mounted on the seat back.

2. The seat back pad according to claim 1, wherein: The width of the plurality of grooves in the seat vertical direction increases toward the rear side of the seat.

3. The seat back pad according to claim 1, comprising: a cushion body portion disposed at a center portion of the seat back in the left-right direction of the seat; and The left and right cushion side portions are arranged on both sides of the seat back in the left and right direction of the seat, Left and right recessed portions that are recessed toward the front side of the seat are formed at both ends of the rear surface of the lower portion of the pad main body in the left and right direction of the seat. The plurality of grooves are formed on the back surface of the lower portion of the pad main body, and both ends of the plurality of grooves in the left-right direction of the seat are open to the left-right recessed portions.

4. A vehicle seat, comprising: Seat cushions, for the occupants of the vehicle to sit on; a seat back supporting the back of the occupant; and A lumbar support device is mounted on the seat back. The cushion member of the seat back is formed by the seat back cushion according to any one of claims 1 to 3.

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