Seat back pad and vehicle seat

Abstract

To increase an operation range of a lumber support device.SOLUTION: A seat back pad 20 forms a pad material of a seat back 14 of a vehicle seat and is covered with a seat back skin 26. In this seat back pad 20, a plurality of grooves 24 extending in a seat horizontal direction are formed in a seat vertical direction in a rear surface of a lower part facing a lumber support device 28 mounted in the seat back 14.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a vehicle seat, and more particularly to a seat back pad which is a padding material for a seat back. [Background technology]

[0002] The following Patent Documents 1 to 3 disclose vehicle seats in which a lumbar support device is mounted on the seat back. The seat back has a seat back pad, which is a padding material, and a cover covering the seat back pad. The lumbar support device is disposed on the rear side of the seat with respect to the seat back pad, and adjusts the support force for the lumbar region of the occupant by pushing the lower part of the seat back pad forward of the seat. This makes it possible to improve the comfort of the occupant regardless of the physique of the occupant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 64-15556 [Patent Document 2] Japanese Utility Model Application Publication No. 63-42258 [Patent Document 3] Japanese Utility Model Application Publication No. 59-132557 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned prior art has a problem that the seat back pad and the cover act as resistance, narrowing the operating range of the lumbar support device. In particular, since the cover has a large deformation resistance at the lower end of the seat back, it is difficult to sufficiently lower the support position of the lumbar of the occupant.

[0005] SUMMARY OF THE PRESENT INVETION The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a seat back pad and a vehicle seat that can widen the operating range of a lumbar support device. [Means for solving the problem]

[0006] The seatback pad of the first embodiment constitutes the padding material of the seatback of a vehicle seat and is covered with a cover, and has a plurality of grooves extending in the left-right direction of the seat and aligned in the up-down direction of the seat on the lower back surface facing the lumbar support device mounted on the seatback.

[0007] The seatback pad of the first embodiment constitutes a padding material for the seatback of a vehicle seat and is covered with a skin. In this seatback pad, a plurality of grooves extending in the left-right direction of the seat are formed in parallel in the up-down direction of the seat on the back surface of the lower part facing the lumbar support device mounted on the seatback. This reduces the deformation resistance of the seatback pad when the lumbar support device is activated, thereby expanding the operating range of the lumbar support device.

[0008] The seat back pad of the second aspect is the same as the seat back pad of the first aspect, wherein the width of the plurality of grooves in the seat up-down direction increases toward the seat rear side.

[0009] According to the second aspect, the grooves formed on the back surface of the lower portion of the seatback pad have a width in the up-down direction of the seat that increases toward the rear side of the seat. This makes it difficult for the grooves to close when the lower portion of the seatback pad is pushed significantly toward the front side of the seat by the lumbar support device. As a result, it becomes easier to maintain the effect of reducing the deformation resistance of the seatback pad.

[0010] The seat back pad of the third aspect, in the first or second aspect, has a pad main body portion arranged in the center of the seat back in the seat left-right direction, and left and right pad side portions arranged on both sides of the seat back in the seat left-right direction, and left and right recesses recessed toward the front of the seat are formed on both ends of the seat left-right direction on the back surface of the lower part of the pad main body portion, and the multiple grooves are formed on the back surface of the lower part of the pad main body portion, and both ends of the seat left-right direction open into the left and right recesses.

[0011] The seat back pad of the third aspect has a pad main body portion disposed in the center of the seat back in the seat left-right direction, and left and right pad side portions disposed on both sides of the seat back in the seat left-right direction. Left and right recesses recessed toward the front of the seat are formed on both ends in the seat left-right direction of the back surface of the lower part of the pad main body. Both ends in the seat left-right direction of the multiple grooves formed on the back surface of the lower part of the pad main body are open to the left and right recesses. This makes it possible to reduce the deformation resistance of the pad main body portion when the lower part of the pad main body portion is pushed out toward the front of the seat by the lumbar support device, all the way to both ends in the seat left-right direction of the pad main body portion.

[0012] A vehicle seat of a fourth aspect comprises a seat cushion on which a vehicle occupant sits, a seat back supporting the back of the occupant, and a lumbar support device mounted on the seat back, and the padding material of the seat back is constituted by a seat back pad of any one of the first to third aspects.

[0013] In the vehicle seat of the fourth aspect, a vehicle occupant sits on the seat cushion, and the back of the occupant is supported by the seat back. A lumbar support device is mounted on the seat back. The padding material of the seat back is constituted by the seat back pad of any one of the first to third aspects, so that the above-mentioned effects can be obtained. Effect of the Invention

[0014] As described above, in the seat back pad and the vehicle seat according to the present invention, the operating range of the lumbar support device can be expanded. [Brief description of the drawings]

[0015] [Figure 1] 1 is a side view showing a vehicle seat according to an embodiment; [Diagram 2]1 is a perspective view showing a seat back pad of a vehicle seat according to an embodiment of the present invention; [Diagram 3] 3 is a vertical cross-sectional view of the seat back pad according to the embodiment, which corresponds to a cut surface taken along line F3-F3 in FIG. 2. [Figure 4] 4 is a cross-sectional view corresponding to FIG. 3, illustrating a state in which a lower portion of a seat back pad according to the embodiment is pushed out by a lumbar support device. FIG. [Diagram 5] FIG. 4 is a perspective view showing a seat back pad of a vehicle seat according to a comparative example. [Figure 6] 6 is a longitudinal sectional view of a seat back pad according to a comparative example, which corresponds to a cut surface taken along line F6-F6 in FIG. 5. [Figure 7] 7 is a cross-sectional view corresponding to FIG. 6, illustrating a state in which a lower portion of a seat back pad according to a comparative example is pushed out by a lumbar support device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a vehicle seat 10 according to an embodiment of the present invention will be described with reference to Figs. 1 to 7. In each drawing, some reference numerals may be omitted in order to make the drawings easier to see. Arrows FR, LH, and UP, which are appropriately written in each drawing, respectively indicate the front, left, and top of the vehicle seat 10. Hereinafter, when the front-rear, left-right, top-bottom directions are used in the description, they are taken to indicate directions relative to the vehicle seat 10.

[0017] 1, a vehicle seat 10 according to this embodiment includes a seat cushion 12 on which a vehicle occupant sits, a seat back 14 that supports the back of the occupant, and a headrest 16 that supports the head of the occupant. The seat back 14 includes a frame (not shown) that is a skeleton member, a seat back pad 20 (see FIG. 2) that is a padding material attached to the frame, a seat back skin 26 that is a skin that covers the seat back pad 20, a seat back spring (elastic body) (not shown) that is attached to the frame and elastically supports the seat back pad 20 from the rear, and a lumbar support device 28 that is attached to the seat back spring.

[0018] The seatback pad 20 is made of a foam such as urethane foam. As shown in Fig. 2, the seatback pad 20 has a pad main body 20A disposed in the center of the seatback 14 in the left-right direction, and left and right pad side portions 20B disposed on both left-right sides of the seatback 14. The seatback pad 20 is completely covered with a seatback skin 26.

[0019] Left and right recesses 22 recessed forward are formed at both left and right ends of the back surface of the lower part of the pad main body 20A. In addition, a plurality of (here, five) grooves 24 extending in the left and right direction are formed in the back surface of the lower part of the pad main body 20A, aligned at approximately equal intervals in the up and down direction. Both left and right ends of the grooves 24 open into the left and right recesses 22 (communicate with the left and right recesses 22). In addition, as shown in FIG. 3, the grooves 24 have a vertical width (groove width) that increases toward the rear side, and are approximately wedge-shaped when viewed in the left and right direction.

[0020] The grooves 24 face a lumbar support device 28 disposed behind the pad main body 20A. The lumbar support device 28 includes an upper lifting section 30 disposed in the vertical middle of the seat back 14, and a lower lifting section 32 disposed at the lower end of the seat back 14. The upper lifting section 30 and the lower lifting section 32 are each slidably engaged at their left and right ends with a pair of left and right guide wires 34 (the left guide wire 34 is not shown). The left and right guide wires 34 are supported by the frame of the seat back 14.

[0021] A pair of left and right arch forming parts 36 are bridged between the upper lifting / lowering part 30 and the lower lifting / lowering part 32. The left and right arch forming parts 36 are made of band-shaped elastic metal or resin plates with the vertical direction as the longitudinal direction, and are curved in a circular arc shape that convex forward when viewed in the horizontal direction. The upper lifting / lowering part 30, the lower lifting / lowering part 32, and the left and right arch forming parts 36 can be raised and lowered together in the vertical direction by a lifting mechanism (not shown) provided in the lumbar support device 28. This lifting mechanism is, for example, a feed screw mechanism.

[0022] The upper lifting / lowering section 30 and the lower lifting / lowering section 32 can be separated and moved in the up-down direction by an arch deformation mechanism (not shown) provided in the lumbar support device 28. The arch deformation mechanism is, for example, a feed screw mechanism, and is configured to separate and move the upper lifting / lowering section 30 relative to the lower lifting / lowering section 32 by operating it. When the upper lifting / lowering section 30 approaches the lower lifting / lowering section 32, the curvature of the curve of the left and right arch forming sections 36 becomes stronger, and the vertical intermediate parts of the arch forming sections 36 protrude forward. As a result, the lower part of the pad main body 20A is pushed forward together with the seat back skin 26. When the upper lifting / lowering section 30 moves away from the lower lifting / lowering section 32, the curvature of the curve of the left and right arch forming sections 36 becomes weaker, and the vertical intermediate parts of the left and right arch forming sections 36 retreat to the rear side. As a result, the pad main body 20A and the seat back skin 26 are configured to elastically return to their original states. In addition, between the left and right arch forming portions 36 and the pad main body 20A, resin plates 38 called baskets or the like are interposed.

[0023] Next, the operation and effects of this embodiment will be described.

[0024] In the vehicle seat 10 configured as described above, the seat back pad 20 constituting the padding material of the seat back 14 is covered with a seat back skin 26. In this seat back pad 20, a plurality of grooves 24 extending in the left-right direction are formed aligned in the up-down direction on the lower back surface facing the lumbar support device 28 mounted on the seat back 14. This reduces the deformation resistance of the seat back pad 20 when the lumbar support device 28 is activated, and therefore the operating range of the lumbar support device 28 can be expanded.

[0025] The above-mentioned effect will be further explained using a comparative example shown in Figs. 5 to 7. In this comparative example, the seat back pad 20 does not have a plurality of grooves 24, but the other configurations are the same as those of this embodiment. In this comparative example, when the lumbar support device 28 operates, the seat back pad 20 and the seat back skin 26 become resistance, and the operating range (adjustment range) of the lumbar support device 28 is narrowed. Specifically, in the lower part of the seat back pad 20, excess material gathers on the back side pressed by the lumbar support device 28 (see arrow A in Fig. 7), preventing the deformation of the pad main body 20A, and thus inhibiting the forward extrusion of the seat back pad 20. In addition, at the lower end part side of the seat back 14, the deformation resistance of the seat back skin 26 is large, so that the operating range of the lumbar support device 28 tends to be narrowed. For this reason, even if the upper lifting section 30, the lower lifting section 32, and the left and right arch forming sections 36 are lowered by the lifting mechanism, it becomes difficult to lower the support position of the occupant's lower back by the seat back pad 20 (it becomes difficult to displace the lumbar support device 28 in the direction of arrow B in Figure 7).

[0026] In contrast, in this embodiment, since a plurality of grooves 24 are formed on the back surface of the lower portion of the seatback pad 20, when the lower portion of the seatback pad 20 is pushed forward by the lumbar support device 28, the accumulation of excess material on the back surface is reduced, and the deformation resistance of the seatback pad 20 is reduced. This makes it easier for the seatback pad 20 to deform, and it becomes possible to expand the operating range of the lumbar support device 28 downward (see arrow B in FIG. 4). As a result, it becomes possible to sufficiently lower the support position of the lumbar part of the occupant by the seatback pad 20, and it becomes possible to improve the posture retention of the occupant.

[0027] In this embodiment, the grooves 24 formed on the back surface of the lower portion of the seatback pad 20 have a larger vertical width toward the rear side. This makes it difficult for the grooves 24 to close when the lower portion of the seatback pad 20 is pushed forward by the lumbar support device 28. As a result, the effect of reducing the deformation resistance of the seatback pad 20 can be easily maintained.

[0028] In this embodiment, the seat back pad 20 has a pad main body 20A disposed in the center of the seat back 14 in the left-right direction, and left and right pad side parts 20B disposed on both left and right sides of the seat back 14. Left and right recesses 22 recessed forward are formed at both left and right ends of the lower back surface of the pad main body 20A. The multiple grooves 24 formed on the lower back surface of the pad main body 20A have both left and right ends open to the left and right recesses 22. This makes it possible to reduce 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, over both left and right ends of the pad main body 20A.

[0029] In the above embodiment, both left and right ends of the multiple grooves 24 are configured to open into the left and right recesses 22, but this is not limited to this, and the seat back pad 20 may be configured so that the left and right recesses 22 are not formed.

[0030] In the above embodiment, the vertical width of the multiple (five) grooves 24 increases toward the rear side, but the present invention is not limited to this, and the shape and number of the multiple grooves 24 can be changed as appropriate.

[0031] In addition, the present invention can be implemented in various modifications without departing from the spirit and scope of the present invention. Furthermore, the scope of the present invention is not limited to the above-described embodiment. [Explanation of symbols]

[0032] 10 Vehicle seats 12 Seat cushion 14 Seat back 20 Seat back pad 20A Pad body 20B Pad side 22 Recess 24 groove 26 Seat back skin (skin) 28 Lumbar support device

Claims

1. A seat back pad that constitutes a padding material for a seat back of a vehicle seat and is covered with a skin, A seat back pad has a plurality of grooves extending in the left-right direction of the seat and aligned in the up-down direction of the seat on a lower back surface facing a lumbar support device mounted on the seat back.

2. The seat back pad according to claim 1 , wherein the grooves have a width in the up-down direction of the seat that increases toward the rear side of the seat.

3. A pad main body portion disposed in a center portion of the seat back in a seat left-right direction; Left and right pad side portions disposed on both sides of the seat back in the seat left and right direction; having The pad body has left and right recesses formed at both ends in the left and right direction of the seat on the back surface of the lower portion thereof, the left and right recesses being recessed toward the front side of the seat, 2. The seat back pad according to claim 1, wherein the plurality of grooves are formed on a back surface of a lower portion of the pad body, and both end portions in the left-right direction of the seat are open to the left and right recesses.

4. A seat cushion on which a vehicle occupant sits; A seat back that supports the back of the occupant; A lumbar support device mounted on the seat back; Equipped with A vehicle seat, wherein the padding material of the seat back is constituted by the seat back pad according to any one of claims 1 to 3.

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