Seat cushion

Abstract

Provided is a seat cushion in which a feeling of touching the ground is unlikely to occur even if the thickness of the cushion is thin. A seat cushion (1) is provided with a seat cushion (3) and a planar panel frame (2F) that supports the seat cushion (3) from the back side of the cushion. The seat cushion (3) is provided with a pair of ischium supporting parts (3A) for supporting the left and right ischium of a seated occupant, and a pair of concave cushion back concave parts (3B) formed on the cushion back surface of the pair of ischium supporting parts (3A). The panel frame (2F) is provided with: a pair of through holes (F1) formed directly below the pair of ischial supports (3A); and a first cushion support portion (F3) that supports the seat cushion (3) from the cushion back side between the pair of through holes (F1).

Description

Technical Field

[0001] The present invention relates to a seat cushion, and more particularly to a seat cushion including a seat cushion and a planar panel frame supporting the seat cushion from a back side of the cushion. Background Art

[0002] Patent Document 1 discloses a structure in which a seat cushion is supported from the back side of a cushion by a planar panel frame in a seat cushion. A recessed portion for improving cushioning properties is formed on the back side of the cushion of the seat cushion.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2014-227137. Summary of the invention Problems to be solved by the invention

[0004] In the structure described in Patent Document 1, when the cushion thickness of the seat pad cannot be ensured due to the restriction of thinning the seat pad, a bottoming feeling is easily generated at the support portion of the ischial bones where the seat pressure is high. Therefore, the present invention provides a seat pad that is less likely to generate a bottoming feeling even if the cushion thickness is thin. Means for solving problems

[0005] As a means for solving the above-mentioned problems, the seat cushion of the present invention adopts the following means.

[0006] That is, the first technical solution of the present invention is a seat cushion, comprising a seat cushion and a planar panel frame supporting the seat cushion from the back side of the cushion, the seat cushion having a pair of ischium support portions for supporting the left and right ischiums of a seated occupant and a pair of concave cushion back recesses formed on the back side of the cushion of the pair of ischium support portions, the panel frame having a pair of avoidance portions which are recessed or form through holes on the back side of the frame directly below the pair of ischium support portions and a first cushion support portion which supports the seat cushion from the back side of the cushion between the pair of avoidance portions.

[0007] According to the first technical solution, the left and right ischium support parts of the seat cushion can be easily bent by the left and right cushion back recesses formed on the cushion back of the seat cushion. In addition, the ischium support parts of the seat cushion can avoid contact with the panel frame even if they are bent due to the sitting load by the avoidance parts formed directly below the ischium support parts of the panel frame. As a result, it is possible to make it difficult for the ischium support parts of the seat cushion to have a bottoming feeling. In addition, the ischium support parts of the seat cushion can be prevented from falling off by the first cushion support part of the panel frame supporting the ischium support parts of the seat cushion from the back side of the cushion.

[0008] A second technical solution of the present invention is that, in the above-mentioned first technical solution, the pair of escape portions are the through holes.

[0009] According to the second aspect, even when a sufficient space cannot be secured on the rear side of the frame due to constraints such as the storage battery being mounted directly below the panel frame, a pair of escape portions can be appropriately provided on the panel frame.

[0010] A third technical solution of the present invention is that in the above-mentioned first or second technical solution, the panel frame also includes a pair of second cushion support parts, which support a pair of side support parts of the seat cushion from the back side of the cushion and deviate to the outside of the pair of cushion back recesses in the seat width direction.

[0011] According to the third aspect, the side support portions of the seat cushion are supported from the cushion back side by the pair of second cushion support portions of the panel frame, so that the seat cushion can be structured to be less likely to have a left-right rocking feeling.

[0012] A fourth aspect of the present invention is that, in the first or second aspect, the pair of escape portions formed in the panel frame are arranged within a formation area of ​​the pair of pad back recesses formed in the seat pad in a plan view.

[0013] According to the fourth aspect, it is possible to appropriately suppress the friction between the pad back surface of the seat pad and the peripheral edges of the respective relief portions of the panel frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing a schematic structure of a seat cushion according to the first embodiment.

[0015] Figure 2 This is an exploded perspective view of the seat cushion removed from the panel frame.

[0016] Figure 3 It is a bottom view of the seat cushion.

[0017] Figure 4 yes Figure 3 Sectional view along line IV-IV.

[0018] Figure 5 The seat cushion is shown as being bent due to the seat being seated. Figure 4 The corresponding cross-sectional view. DETAILED DESCRIPTION

[0019] Hereinafter, a mode for carrying out the present invention will be described using the drawings. 《First Implementation Mode》 (Schematic Structure of Seat Cushion 1)

[0020] First, use Figure 1~Figure 5The structure of the seat cushion 1 according to the first embodiment of the present invention will be described. In the following description, when directions such as front, back, up, down, left, and right are indicated, these directions are indicated in the drawings.

[0021] In addition, when "seat" is indicated in various directions such as "seat width direction", it refers to various directions based on the seat cushion 1. In the following description, when no specific reference figure is shown or when there is no corresponding symbol in the reference figure, a reference shall be made to the reference figure as appropriate. Figure 1~Figure 5 Any picture in .

[0022] like Figure 1 As shown in the figure, the seat cushion 1 involved in this embodiment is configured as a seating portion of a rear seat of an automobile. The seat cushion 1 is installed on a floor of an automobile (not shown). The seat cushion 1 includes a metal seat frame 2 constituting its frame, a seat pad 3 made of foamed polyurethane installed on the upper part of the seat frame 2, and a seat cover (not shown) covering the seat pad 3 from the pad surface side.

[0023] The seat frame 2 has a pair of long plate-shaped left and right side frames 2A extending in the seat front-rear direction along the left and right side portions of the seat cushion 1. In addition, the seat frame 2 has a circular tubular front pipe 2B extending in the seat width direction along the front side portion of the seat cushion 1. In addition, the seat frame 2 has a circular tubular rear pipe 2C extending in the seat width direction along the rear side portion of the seat cushion 1.

[0024] The front pipe 2B is connected to the front end of the pair of left and right side frames 2A so as to extend in the seat width direction. The rear pipe 2C is connected to the rear end of the pair of left and right side frames 2A so as to extend in the seat width direction.

[0025] The seat frame 2 has a cylindrical front rod 2D and a rear rod 2E connected to each other in the middle of the left and right side frames 2A in the seat longitudinal direction.

[0026] The seat frame 2 has a rectangular panel frame 2F connected between the front pipe 2B and the rear rod 2E in the seat front-rear direction. The panel frame 2F is welded so that its front edge abuts the front pipe 2B from above, and its rear edge abuts the rear rod 2E from above.

[0027] In addition, the panel frame 2F is welded so that the middle part in the front-rear direction of the seat abuts the front rod 2D from above. Thus, the panel frame 2F supports three locations in the front-rear direction of the seat from the back side of the frame over the entire area in the seat width direction through the three components of the front pipe 2B, the front rod 2D and the rear rod 2E.

[0028] The seat frame 2 functions as a cushion support portion that supports the seat cushion 3 provided thereon from the cushion back side. Specifically, the seat frame 2 supports the top plate side portions (the side portions in the seat width direction) of the seat cushion 3 from the cushion back side via a pair of left and right side frames 2A.

[0029] The seat frame 2 supports the top plate main body (center portion in the seat width direction) of the seat cushion 3 from the cushion back side via its panel frame 2F. Specifically, the panel frame 2F supports the buttocks and thighs of the seated occupant in a planar manner from the cushion back side via the seat cushion 3.

[0030] The seat frame 2 is configured such that a battery mounted on a floor (not shown) is disposed close to and directly below the panel frame 2F. Therefore, the seat frame 2 supports the seat cushion 3 rigidly with minimal bending to the back of the frame by the panel frame 2F which is less flexible than the spring.

[0031] However, if the seat frame 2 supports the seat pad 3 too hard over the entire area, a bottoming feeling is likely to occur particularly in the support portion of the ischial bones where the seat pressure is high. Such a problem becomes significant when the seat pad 3 cannot have a sufficient cushion thickness as the seat cushion 1 becomes thinner.

[0032] Therefore, in order to reduce the bottoming feeling, the seat pad 3 and the panel frame 2F adopt a structure that can reduce the bottoming feeling even if the pad thickness is thin. Figure 2~Figure 4 As shown in FIG. 1 , the seat pad 3 has a pad back recess 3B that is recessed in a concave shape formed on the pad back surface of a pair of ischium support portions 3A that support the left and right ischiums of the seated occupant.

[0033] The pad back recesses 3B are formed in a shape that not only corresponds to the pad back surface of the left and right ischium supporting parts 3A, but also extends in an elliptical shape beyond the left and right ischium supporting parts 3A in the seat front-rear direction. These pad back recesses 3B are formed in a shape that is recessed in a concave curved surface shape in cross section. Specifically, these pad back recesses 3B are formed in a shape that is recessed the deepest at the position corresponding to the pad back surface of the left and right ischium supporting parts 3A, and gradually becomes shallower as it extends in the seat front-rear direction from there.

[0034] In addition, a pair of left and right through holes F1 extending in the front-to-back direction and penetrating in the shape of an oblong hole are formed on the panel frame 2F at positions corresponding to the positions directly below the left and right ischial support parts 3A of the seat pad 3. Here, each through hole F1 corresponds to the "avoidance portion" of the present invention. In addition, in addition to each through hole F1, a plurality of circular hole-shaped lightening holes F2 are formed on the panel frame 2F to reduce the weight in a manner that does not affect the performance of the panel frame 2F. Each through hole F1 is formed in the shape of an oblong hole that is longer than each lightening hole F2 in the front-to-back direction.

[0035] like Figure 3~Figure 4 As shown, by the above structure, when the seat cushion 3 receives a seating load from its cushion surface side, the left and right ischial bone supporting parts 3A are easily bent toward the cushion back side. Figure 5 As shown, the seat cushion 3 receives the seating load from the cushion surface side, whereby the left and right ischial bone supporting portions 3A bend so as to crush the depressions of the cushion back recesses 3B toward the cushion back side.

[0036] Furthermore, the through holes F1 formed in the panel frame 2F are arranged at positions corresponding to the positions directly below the left and right ischium supporting portions 3A of the seat pad 3. Therefore, even if the left and right ischium supporting portions 3A are bent toward the back side of the pad due to the seating load, the seat pad 3 can be released from the through holes F1 toward the bottom of the seat without the left and right ischium supporting portions 3A contacting the panel frame 2F. As a result, the ischium supporting portions 3A of the seat pad 3 are less likely to feel bottoming out.

[0037] Specifically, Figure 2 As shown in FIG. 1 , the seat cushion 3 is formed such that the left and right cushion back recesses 3B are not connected to each other but are separated from each other. Figure 3 As shown, the portion between the left and right ischium supports 3A of the seat pad 3 is supported from the back side by the first pad supports F3 between the through holes F1 of the panel frame 2F. The support of the first pad supports F3 can prevent the ischium supports 3A of the seat pad 3 from falling off.

[0038] In addition, if Figure 4 As shown, the left and right side support portions 3C of the seat cushion 3, which are offset to the outside in the seat width direction from the left and right cushion back recessed portions 3B, are supported from the cushion back side by the left and right second cushion support portions F4, which are offset to the outside in the seat width direction from the left and right through holes F1 of the panel frame 2F. Therefore, the seat cushion 3 can be made into a structure that does not easily cause a left-right shaking feeling.

[0039] like Figure 3As shown, the pair of through holes F1 formed in the panel frame 2F are arranged in a plan view within the formation area of ​​the pair of pad back recesses 3B formed in the seat pad 3. Therefore, friction between the pad back surface of the seat pad 3 and the periphery of each through hole F1 of the panel frame 2F can be appropriately suppressed.

[0040] In summary, the seat cushion 1 according to the present embodiment is configured as follows: In the following, the reference numerals in parentheses correspond to the respective configurations shown in the above-described embodiment.

[0041] That is, a seat cushion (1) comprises a seat cushion (3) and a planar panel frame (2F) supporting the seat cushion (3) from the back side of the cushion. The seat cushion (3) comprises a pair of ischium support portions (3A) supporting the left and right ischiums of a seated occupant and a pair of concave cushion back recesses (3B) formed on the back side of the cushion of the pair of ischium support portions (3A). The panel frame (2F) comprises: a pair of avoidance portions (F1) recessed or formed with through holes (F1) toward the back side of the frame directly below the pair of ischium support portions (3A); and a first cushion support portion (F3) supporting the seat cushion (3) from the back side of the cushion between the pair of avoidance portions (F1).

[0042] According to the above structure, the left and right ischium support parts (3A) of the seat cushion (3) can be easily bent by forming the left and right cushion back recesses (3B) on the back side of the cushion of the seat cushion (3). In addition, the ischium support parts (3A) of the seat cushion (3) can be avoided from contacting the panel frame (2F) even if they are bent due to the sitting load by forming the avoidance part (F1) directly below the ischium support parts (3A) of the panel frame (2F). As a result, it is possible to make it difficult for each ischium support part (3A) of the seat cushion (3) to have a bottoming feeling. In addition, each ischium support part (3A) of the seat cushion (3) can be supported from the back side of the cushion by the first cushion support part (F3) of the panel frame (2F), so that each ischium support part (3A) of the seat cushion (3) will not fall off.

[0043] In addition, the pair of escape portions (F1) are through holes (F1). According to the above structure, even when it is impossible to ensure sufficient space on the back side of the frame due to constraints such as mounting a battery directly below the panel frame (2F), a pair of escape portions (F1) can be appropriately provided on the panel frame (2F).

[0044] In addition, the panel frame (2F) further includes a pair of second cushion support portions (F4) that support a pair of side support portions (3C) of the seat cushion (3) from the cushion back side and that are offset to the outside in the seat width direction from the pair of cushion back recessed portions (3B). Thus, by supporting the side support portions (3C) of the seat cushion (3) from the cushion back side by the pair of second cushion support portions (F4) of the panel frame (2F), the seat cushion (3) can be made to have a structure that is less likely to cause a left-right shaking feeling.

[0045] In addition, a pair of escape portions (F1) formed on the panel frame (2F) is configured to be within a formation area of ​​a pair of pad back recesses (3B) formed on the seat pad (3) when viewed from above. According to the above structure, friction between the pad back surface of the seat pad (3) and the peripheral edges of the escape portions (F1) of the panel frame (2F) can be appropriately suppressed. 《Regarding other implementation methods》

[0046] As mentioned above, although the embodiment of the present invention was described using one embodiment, the present invention can be implemented in various forms other than the above-described embodiment.

[0047] 1. The seat cushion of the present invention can be applied to seats of vehicles other than automobiles and railways, as well as seats of vehicles other than aircraft and ships. In addition, the seat cushion can also be applied to seats other than vehicles.

[0048] 2. The pair of cushion back recesses formed on the cushion back of the seat cushion may be recessed in a curved surface shape or a bent curved surface shape. In addition, the pair of cushion back recesses may be formed of a single recess or a plurality of recesses.

[0049] 3. The pair of escape portions formed in the panel frame may be formed by recessed portions recessed toward the back side of the frame in addition to through holes. The pair of escape portions may be formed so as to cross the formation area of ​​the pair of pad back recessed portions formed in the seat pad when viewed from above. The pair of escape portions are formed so as to cross the formation area of ​​the pair of pad back recessed portions when viewed from above, thereby making it possible to more widely avoid contact with the ischial support portions of the seat pad. Description of Reference Numerals

[0050] 1 Seat Cushion

[0051] 2 Seat frame

[0052] 2A side frame

[0053] 2B front tube

[0054] 2C rear tube

[0055] 2D front bar

[0056] 2E rear rod

[0057] 2F panel frame

[0058] F1 through hole (avoidance part)

[0059] F2 Lightening Hole

[0060] F3 first pad support part

[0061] F4 Second pad support

[0062] 3 Seat padding

[0063] 3A Sciatica Support

[0064] 3B pad back concave

[0065] 3C side support part.

Claims

1. A seat cushion, comprising: a seat cushion; and a planar panel frame supporting the seat cushion from a back side of the cushion, The seat pad has: a pair of ischial bone supports for supporting left and right ischial bones of a seated occupant; and A pair of concave pad back recesses formed on the pad back surfaces of the pair of ischial support portions, The panel frame has: A pair of escape portions that are recessed toward the back side of the frame or form through holes directly below the pair of ischial support portions; and A first pad supporting portion supports the seat pad from a pad back side between the pair of escape portions.

2. The seat cushion according to claim 1, wherein: The pair of escape portions are the through holes.

3. The seat cushion according to claim 1 or 2, wherein: The panel frame further includes a pair of second pad support portions that support, from a pad back side, a pair of side support portions of the seat pad that are offset outward in a seat width direction from the pair of pad back recessed portions.

4. The seat cushion according to claim 1 or 2, wherein: The pair of escape portions formed in the panel frame are arranged to be within a formation area of ​​the pair of pad back recessed portions formed in the seat pad in a plan view.

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