Cushion for seat

Abstract

To provide a cushion for a seat which can reduce a burden on the waist of an occupant in a lying state of the occupant on the seat.SOLUTION: A sleeping-in-car cushion 10 includes a foamed body 20 which has a lower surface section 24 arranged on a seat surface 14A of a seat cushion 14, a first support surface section 26A which protrudes and curves to an opposite side of a boundary 18 between a seat back 16 and the seat cushion 14 viewed from a seat width direction, has an end 26A1 on a seat rear side positioned on the seat rear side of an end 24A on the seat rear side of the lower surface section 24 and can support an occupant seated on a seat 12, a second support surface section 26B which protrudes and curves to an opposite side of the boundary 18 viewed from the seat width direction, is positioned on a seat front side and a seat lower side with respect to the first support surface section 26A and can support the occupant, and a recessed surface 26C which interposes between the first support surface section 26A and the second support surface section 26B and curves to the boundary 18 side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a seat cushion. [Background technology]

[0002] The following Patent Document 1 discloses an invention related to a lumbar pillow. This lumbar pillow is placed on the seat on which the passenger sits, and reduces the burden on the passenger's lower back when seated on the seat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-44849 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the prior art described in Patent Document 1 does not assume use when the occupant is lying down on the seat, such as when the occupant is resting, etc. In other words, the prior art described in Patent Document 1 has room for improvement in terms of reducing the burden on the occupant's lower back when the occupant is lying down on the seat.

[0005] SUMMARY OF THE PRESENT EMBODIMENT In consideration of the above, an object of the present invention is to provide a seat cushion that can reduce the burden on the lower back of an occupant when the occupant is lying down on the seat. [Means for solving the problem]

[0006] The seat cushion of the first aspect has a foam that, when arranged at the boundary between a seat back and a seat cushion in a seat, includes: a lower surface portion that is arranged on the sitting surface of the seat cushion; a first support surface portion that is curved and convex on the opposite side of the boundary when viewed from the seat width direction, with a first end portion on the rear side of the seat located further rearward than a second end portion on the rear side of the lower surface portion, and is capable of supporting an occupant seated on the seat; a second support surface portion that is curved and convex on the opposite side of the boundary when viewed from the seat width direction, is located forward and below the first support surface portion, and is capable of supporting an occupant; and a concave surface portion that is interposed between the first support surface portion and the second support surface portion and is curved toward the boundary when viewed from the seat width direction.

[0007] The seat cushion according to the first aspect is disposed at the boundary between the seat back and the seat cushion in the seat. In this aspect, the lower surface of the foam of the seat cushion is disposed on the seat surface of the seat cushion.

[0008] Incidentally, since the magnitude of the load on the foam caused by the weight of an occupant sitting in the seat varies depending on the part of the foam, in order to distribute the pressure acting from the foam to the surface of the occupant's body, i.e., body pressure, it is preferable to adjust the shape of the foam according to the magnitude of the above-mentioned load.

[0009] In this embodiment, the foam is provided with a first support surface portion, a second support surface portion, and a concave surface portion. More specifically, the first support surface portion is curved to be convex on the opposite side to the boundary portion when viewed from the seat width direction, and a first end portion on the seat rear side of the first support surface portion is located further rearward than a second end portion on the seat rear side of the foam's lower surface portion.

[0010] On the other hand, the second support surface portion is curved convexly on the opposite side to the boundary portion as viewed in the seat width direction, and is located on the seat front side and below the first support surface portion. The concave surface portion is interposed between the first support surface portion and the second support surface portion, and is curved toward the boundary portion as viewed in the seat width direction.

[0011] In other words, in this embodiment, the thickness of the foam can be ensured at the first support surface portion and its surrounding area that supports the occupant seated on the seat, and at the second support surface portion and its surrounding area that supports the occupant, and as a result, the above-mentioned load can be distributed by deformation of these areas.

[0012] On the other hand, since the load from the occupant is prevented from directly acting on the concave portion of the foam, the first support surface portion and its periphery and the second support surface portion and its periphery of the foam are deflected toward the concave portion due to the load. As a result, in this embodiment, the body pressure when the foam supports the occupant can be dispersed.

[0013] The seat cushion of the second aspect is the seat cushion of the first aspect, wherein the foam has a pair of side portions extending from the outer sides of the lower surface portion in the seat width direction toward the upper side of the seat and the outer sides in the seat width direction when viewed from the front side of the seat.

[0014] According to the seat cushion of the second aspect, the foam is provided with a pair of side surfaces, which extend from the outer sides of the lower surface part in the seat width direction to the upper side of the seat and the outer sides in the seat width direction when viewed from the front side of the seat. Therefore, in this aspect, the side supports provided on the seat back or the seat cushion can be stored on the seat lower side of the side surfaces of the foam.

[0015] As a result, in this aspect, the widths of the first support surface portion and the second support surface portion are increased to positions that overlap with the side supports when viewed from above the seat, thereby reducing the body pressure acting on the occupant.

[0016] The seat cushion of the third aspect is the seat cushion of the first or second aspect, wherein a groove portion extending in the seat width direction is formed in the first support surface portion and / or the second support surface portion.

[0017] According to the seat cushion of the third aspect, a groove portion extending in the seat width direction is formed in at least one of the first support surface portion and the second support surface portion, so that a portion that is easily deformed by the weight of the occupant can be set along the seat width direction on that one of the portions.

[0018] The seat cushion of the fourth aspect is a seat cushion of any one of the first to third aspects, wherein the foam further includes a back portion that connects the first end and the second end and is placed on the seat back, and the back portion is concavely curved when viewed from the seat width direction.

[0019] According to the seat cushion of the fourth aspect, the foam has a back surface portion, which connects the first end of the first support surface portion and the second end of the lower surface portion, and is disposed on the seat back. The back surface portion of the foam is curved in a concave shape when viewed from the seat width direction. Therefore, in this aspect, the back surface portion of the foam can be aligned with the seat back, and the weight of the occupant is supported by the seat back via the foam.

[0020] A seat cushion according to a fifth aspect is the seat cushion according to any one of the first to fourth aspects, wherein the seat cushion is a cushion for sleeping in a vehicle.

[0021] According to the fifth aspect of the seat cushion, the seat cushion is a vehicle overnight cushion, and when an occupant sleeps overnight in the vehicle, the vehicle overnight cushion is placed at the boundary between the seat back and the seat cushion, thereby dispersing the body pressure acting on the occupant sleeping on the seat. Effect of the Invention

[0022] As described above, the seat cushion according to the present invention has the excellent effect of reducing the burden on the lower back of an occupant when the occupant is lying down on the seat. [Brief description of the drawings]

[0023] [Figure 1] 1 is a longitudinal sectional view seen from a seat width direction, which diagrammatically illustrates a configuration of a seat cushion according to an embodiment of the present invention. [Diagram 2] 2 is a plan view (view taken in the direction of arrow 2 in FIG. 1) showing a schematic configuration of the seat cushion according to the present embodiment, as viewed from above the seat. [Diagram 3] 3 is a front view (view taken in the direction of the arrow 3 in FIG. 1) showing a schematic diagram of the configuration of the seat cushion according to the present embodiment, as seen from the front side of the seat. [Figure 4] 1 is a perspective view seen from the front side of a seat, illustrating a state in which a seat cushion according to an embodiment of the present invention is in use. FIG. [Diagram 5] FIG. 2 is a reference perspective view showing a configuration of a seat cushion according to the embodiment. [Figure 6] 1 shows the configuration of a seat cushion for this embodiment, where (A) is a front view of the seat cushion, (B) is a rear view of the seat cushion, (C) is a plan view of the seat cushion, (D) is a left side view of the seat cushion, (E) is a right side view of the seat cushion, and (F) is a bottom view of the seat cushion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] An example of an embodiment of the seat cushion according to the present invention will be described below with reference to Figures 1 to 4. Note that the arrows FR, UP, and RH shown as appropriate in each figure indicate the front side in the front-rear direction, the upper side in the up-down direction, and the right side in the width direction of the seat 12 on which the vehicle overnight cushion 10 serving as the seat cushion is placed, respectively. Note that in this embodiment, as an example, the seat 12 is used as a seat for an automobile, but the seat 12 may also be used as a seat for a vehicle such as an airplane or a ship.

[0025] As shown in FIG. 4, the seat 12 includes a seat cushion 14 that supports the buttocks and thighs of an occupant seated on the seat 12, a seat back 16 that supports the back of the occupant, and a headrest (not shown) that supports the head of the occupant.

[0026] The overnight cushion 10 is disposed on a boundary 18 between the seat cushion 14 and the seat back 16 in the seat 12. The overnight cushion 10 is disposed on the boundary 18, for example, when the seat back 16 is rotated from an upright state to the rear side of the seat with respect to the seat cushion 14 so that the longitudinal direction of the seat back 16 is horizontal, in a fully flat state, or when the seat back 16 is raised from the horizontal to the front side of the seat by about 60 degrees. In the following, unless otherwise specified, the overnight cushion 10 is assumed to be disposed on the boundary 18 when the seat back 16 is raised from the fully flat state by a predetermined angle.

[0027] As shown in FIG. 1, the vehicle camping cushion 10 is configured to include a foam 20 that constitutes the main portion thereof, and a skin 22 that covers the surface of the foam 20. The foam 20 is made of a flexible material having elasticity, and in this embodiment, as an example, the foam 20 is made of soft urethane foam. Note that this soft urethane foam has an apparent density of 15 to 30 (kg / m 3 ) and more preferably 22 (kg / m 3 ), the rebound resilience is set to 35-50(%), preferably 42(%), the hardness is set to 35-110(N), preferably 110(N), and the compression set is set to 3-35(%), preferably 6(%). The urethane foam constituting the foam 20 is not limited to those described above, and any suitable one can be used.

[0028] On the other hand, the skin 22 is constructed by sewing together a skin material made of synthetic leather, fabric, leather, or the like, and is formed into a bag shape capable of containing the foam 20 therein.

[0029] More specifically, the foam 20 is configured to include a lower surface portion 24 that constitutes the lower portion of the seat, an upper surface portion 26 that constitutes the upper portion of the seat, a pair of side portions 28 that constitute the outer portions in the width direction of the seat, and a back surface portion 30 that constitutes the rear portion of the seat.

[0030] The lower surface portion 24 has a rectangular shape with its longitudinal direction aligned with the seat width direction when viewed from below the seat, and is disposed on the seat surface 14A of the seat cushion 14 via a part of the cover 22.

[0031] The upper surface portion 26 includes a first supporting surface portion 26A, a second supporting surface portion 26B, and a concave surface portion 26C interposed between the first supporting surface portion 26A and the second supporting surface portion 26B. As shown in Fig. 2, the length of the upper surface portion 26 in the seat width direction decreases from the rear side of the seat to the front side of the seat when viewed from above the seat.

[0032] The first support surface portion 26A is curved in its main portion along a circular arc A1 with a radius of curvature R1 that is convex on the opposite side to the boundary portion 18 of the seat 12 when viewed in the seat width direction. An end portion 26A1 as a first end portion on the seat rear side of the first support surface portion 26A is located further rearward than an end portion 24A as a second end portion on the seat rear side of the lower surface portion 24.

[0033] On the other hand, the second support surface portion 26B is located on the seat front side and seat lower side of the first support surface portion 26A, and its main portion is curved to follow an arc A2 of a curvature radius R2 that is convex on the opposite side of the boundary portion 18 when viewed from the seat width direction. Note that the curvature radius R2 is set to a value approximately twice the curvature radius R1, but the ratio of R1 to R2 is not limited to this.

[0034] The concave surface portion 26C is curved along an arc A3 with a radius of curvature R3 that is convex toward the boundary portion 18 when viewed from the sheet width direction. Note that the radius of curvature R3 is set to a value approximately one-third the radius of curvature R1, but the ratio of R1 to R3 is not limited to this.

[0035] Further, a groove 32 extending in the seat width direction is formed at each of the tops of the first support surface portion 26A and the second support surface portion 26B. In a longitudinal cross section viewed from the seat width direction, this groove 32 includes a front planar portion 32A constituting the front side of the seat, a rear planar portion 32B constituting the rear side of the seat, and a bottom portion 32C connected to the front planar portion 32A and the rear planar portion 32B.

[0036] More specifically, the front planar portion 32A and the rear planar portion 32B are formed such that the distance between the front planar portion 32A and the rear planar portion 32B increases toward the boundary portion 18 when viewed in the seat width direction. On the other hand, the bottom surface portion 32C is formed to have a concave shape, specifically, an arc shape concave toward the boundary portion 18 when viewed in the seat width direction.

[0037] The upper surface portion 26 configured as described above is capable of supporting the occupant's lower back at the portion on the first supporting surface portion 26A side, and the occupant's buttocks at the portion on the second supporting surface portion 26B side.

[0038] 3, the side surface portion 28 extends upward and outward in the seat width direction from the outer end of the lower surface portion 24 when viewed from the front side of the seat. A part of the side support 14B of the seat cushion 14 and a part of the side support 16A of the seat back 16 are disposed on the seat lower side of the side surface portion 28.

[0039] Returning to Fig. 1, the back surface portion 30 extends from the end 24A of the lower surface portion 24 to the rear upper side of the seat, connects the end 24A and the end 26A1 of the first support surface portion 26A, and is curved in a concave shape when viewed in the seat width direction, specifically, convex toward the front side and the upper side of the seat. The ratio of the length L1 of the foam 20 in the seat front-rear direction to the length L2 in the seat up-down direction is set to about 9:5, but the ratio of L1 to L2 is not limited to this. The foam 20 configured as above has a product center hardness of 20 to 70 (N), preferably 50 (N).

[0040] <Actions and Effects of the Present Embodiment> Next, the operation and effects of this embodiment will be described.

[0041] In this embodiment, as shown in Fig. 4, the overnight cushion 10 is disposed at the boundary 18 between the seat back 16 and the seat cushion 14 in the seat 12. Then, as shown in Fig. 1, the lower surface 24 of the foam 20 of the overnight cushion 10 is disposed on the seat surface 14A of the seat cushion 14.

[0042] Incidentally, since the magnitude of the load on the foam 20 due to the weight of an occupant sitting on the seat 12 varies depending on the part of the foam 20, in order to distribute the pressure acting from the foam 20 on the surface of the occupant's body, i.e., body pressure, it is preferable to adjust the shape of the foam according to the magnitude of the above-mentioned load.

[0043] In this embodiment, the foam 20 is provided with a first support surface portion 26A, a second support surface portion 26B, and a concave surface portion 26C. In detail, the first support surface portion 26A is curved to be convex on the opposite side to the boundary portion 18 when viewed from the seat width direction, and an end portion 26A1 on the seat rear side of the first support surface portion 26A is located further rearward than an end portion 24A on the seat rear side of the lower surface portion 24 of the foam 20.

[0044] On the other hand, the second support surface portion 26B is curved so as to be convex on the opposite side of the boundary portion 18 when viewed from the seat width direction, and is located on the seat front side and the seat lower side with respect to the first support surface portion 26A. The concave surface portion 26C is interposed between the first support surface portion 26A and the second support surface portion 26B, and is curved toward the boundary portion 18 when viewed from the seat width direction.

[0045] That is, in this embodiment, the thickness of the foam 20 can be ensured at the first support surface portion 26A and its surrounding area that supports the back of the occupant seated on the seat 12, and at the second support surface portion 26B and its surrounding area that supports the buttocks of the occupant, and as a result, the above-mentioned load can be dispersed by deformation of these areas.

[0046] On the other hand, since the load from the occupant is prevented from directly acting on the concave surface portion 26C of the foam 20, the first support surface portion 26A and its periphery and the second support surface portion 26B and its periphery of the foam 20 are deflected toward the concave surface portion 26C side by the load. As a result, in this embodiment, the body pressure when the foam 20 supports the occupant can be dispersed.

[0047] 3, the foam 20 is provided with a pair of side surface portions 28, which extend from the outer side in the seat width direction of the lower surface portion 24 toward the upper side of the seat and the outer side in the seat width direction when viewed from the front side of the seat. Therefore, in this embodiment, a part of the side support 14B and the side support 16A can be stored on the seat lower side of the side surface portions 28.

[0048] As a result, in this embodiment, the widths of the first support surface portion 26A and the second support surface portion 26B are expanded to a position where they overlap with the side support 14B and the side support 16A when viewed from above the seat, thereby reducing the body pressure acting on the occupant.

[0049] In addition, in this embodiment, groove portions 32 extending in the seat width direction are formed at the top of the first support surface portion 26A and the top of the second support surface portion 26B, so that points on the first support surface portion 26A and the second support surface portion 26B that are prone to deformation due to the weight of the occupant can be set along the seat width direction.

[0050] In this embodiment, the foam 20 includes a back portion 30, which connects the end 26A1 of the first support surface portion 26A and the end 24A of the lower surface portion 24, and is disposed on the seat back 16. The back portion 30 of the foam 20 is curved in a concave shape when viewed from the seat width direction. Therefore, in this embodiment, the back portion 30 can be aligned along the seat back 16, and the weight of the occupant is supported by the seat back 16 via the foam 20.

[0051] In addition, in this embodiment, when an occupant sleeps overnight in the vehicle, the vehicle sleeping cushion 10 is placed at the boundary portion 18, thereby dispersing the body pressure acting on the occupant sleeping on the seat 12.

[0052] As described above, with the vehicle overnight cushion 10 according to this embodiment, when the occupant is lying down on the seat 12, the burden on the lumbar region of the occupant can be reduced.

[0053] In the above-described embodiment, the grooves 32 are formed in the first support surface portion 26A and the second support surface portion 26B, but depending on the material of the foam 20 and the product center hardness required for the foam 20, the grooves 32 may be provided in the first support surface portion 26A or the second support surface portion 26B, or the grooves 34 may not be provided in the foam 20. In addition, the cross-sectional shape of the grooves 32 can also be appropriately changed depending on the specifications of the overnight stay cushion 10, etc.

[0054] In addition, as shown in Figures 5 and 6, depending on the material of the foam 20, the vehicle camping cushion 10 may be configured so that the foam 20 is not wrapped in a skin 22, i.e., the foam 20 comes into direct contact with the occupant.

[0055] Furthermore, the above-mentioned car sleeping cushion 10 is placed at the boundary between the seat and the backrest when the reclining seat is reclined, eliminating the gap that occurs between the human body and the reclining seat, and supporting the lower back. As shown in the reference diagram (Fig. 4) showing the usage state, the cushion is placed so that the bottom surface of the cushion contacts the seat and the back surface contacts the backrest, and the upper surface supports the lower back of the human body. It can be used in all reclining seats, for example, reclining seats used in automobile seats. It can also be used not only in general reclining seats, but also in reclining beds such as beach beds and hammocks.

[0056] In addition, the overnight cushion 10 can be used when the occupant does not lie down on the seat 12. That is, the overnight cushion 10 can support the occupant's lower back and the vicinity thereof even when the occupant is seated on the seat 12. The overnight cushion 10 can also be used in a state where the first support surface portion 26A and the second support surface portion 26B are located on the lower side of the seat, that is, in a state where the upper and lower surfaces are reversed from the above-mentioned state. [Explanation of symbols]

[0057] 10. Car seat cushions 12 sheets 14 Seat cushion 14A Seat 16 Seat back 18 Boundary 20. Foam 24 Bottom part 24A end (second end) 26A 1st support surface part 26A1 End (1st end) 26B 2nd support surface part 26C concave part 28 Side part 30 Rear part 32 Groove

Claims

1. When the seat is disposed at the boundary between the seat back and the seat cushion, A lower surface portion disposed on the seat surface of the seat cushion; a first support surface portion that is curved convexly on the opposite side to the boundary portion when viewed in the seat width direction, has a first end portion on a seat rear side that is located rearward of a second end portion on the seat rear side of the lower surface portion, and is capable of supporting an occupant seated in the seat; a second support surface portion that is curved convexly on the opposite side of the boundary portion when viewed in the seat width direction, is located on the seat front side and the seat lower side with respect to the first support surface portion, and is capable of supporting an occupant; a concave surface portion interposed between the first support surface portion and the second support surface portion and curved toward the boundary portion when viewed in the sheet width direction; A seat cushion having a foam body comprising:

2. The foam body has a pair of side surfaces extending from the outer sides of the lower surface portion in the seat width direction toward the upper side of the seat and the outer sides in the seat width direction when viewed from the front side of the seat. The seat cushion according to claim 1.

3. A groove portion extending in the sheet width direction is formed in the first support surface portion and / or the second support surface portion. The seat cushion according to claim 1.

4. The foam further includes a back portion that connects the first end and the second end and is disposed on the seat back, When viewed from the seat width direction, the back surface portion is curved in a concave shape. The seat cushion according to claim 1.

5. The seat cushion is a vehicle overnight cushion. The seat cushion according to any one of claims 1 to 4.

Images