Seat cushion

Abstract

To provide a seat cushion which hardly gives a bottom touch feeling even when a pad thickness is thin.SOLUTION: A seat cushion 1 includes a seat pad 3 and a planar panel frame 2F which supports the seat pad 3 from the pad back side. The seat pad 3 includes a pair of innominate bone support parts 3A which support right and left innominate bones of a sitting passenger and a pair of concave pad rear concave parts 3B formed on a pad rear surface of the pair of innominate bone support parts 3A. The panel frame 2F includes a pair of through-holes F1 formed right under the pair of innominate bone support parts 3A and a first pad support part F3 which supports the seat pad 3 between the pair of through-holes F1.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a seat cushion, and more particularly to a seat cushion having a seat pad and a planar panel frame that supports the seat pad from a rear side of the pad. [Background technology]

[0002] Patent Document 1 discloses a seat cushion having a seat pad supported from the back side by a planar panel frame. The seat pad has a recess formed on the back side thereof to enhance cushioning properties. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-227137 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, if the thickness of the seat pad cannot be ensured due to restrictions such as making the seat cushion thinner, a bottoming out sensation is likely to occur at the support portion of the ischial bones, which receive high seating pressure. Therefore, the present invention provides a seat cushion that is less likely to cause a bottoming out sensation even if the pad thickness is thin. [Means for solving the problem]

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

[0006] In other words, the first invention of the present invention is a seat cushion having a seat pad and a planar panel frame that supports the seat pad from the back side of the pad, wherein the seat pad has a pair of ischial support portions that support the left and right ischial bones of a seated occupant, and a pair of concave pad back recesses formed on the back side of the pad of the pair of ischial support portions, and the panel frame has a pair of relief portions that are recessed or form through holes on the back side of the frame directly below the pair of ischial support portions, and a first pad support portion that supports the seat pad from the back side of the pad between the pair of relief portions.

[0007] According to the first aspect of the present invention, the left and right pad rear recesses formed on the rear surface of the seat pad make it easier to flex the left and right ischial support parts of the seat pad. Furthermore, the relief parts formed directly below the ischial support parts of the panel frame prevent the ischial support parts of the seat pad from hitting the panel frame even if they flex due to the seating load. As a result, it is possible to prevent the ischial support parts of the seat pad from feeling like they are bottoming out. Furthermore, the first pad support part of the panel frame supports the spaces between the ischial support parts of the seat pad from the rear side of the pad, so that the ischial support parts of the seat pad do not bottom out.

[0008] A second aspect of the present invention is the seat cushion according to the first aspect, wherein the pair of relief portions are the through holes.

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

[0010] The third invention of the present invention is a seat cushion according to the first or second invention, wherein the panel frame further has a pair of second pad support portions that support from the back side of the pad a pair of side support portions that are offset outward in the seat width direction from the pair of pad back recesses of the seat pad.

[0011] According to the third invention, each side support portion of the seat pad is supported from the back side of the pad by a pair of second pad support portions of the panel frame, thereby making it possible to configure the seat pad so that it is less likely to wobble from side to side.

[0012] A fourth invention of the present invention is a seat cushion according to the first or second invention, wherein a pair of the relief portions formed in the panel frame are arranged to fit within formation areas of a pair of the pad back recesses formed in the seat pad in a planar view.

[0013] According to the fourth aspect of the present invention, it is possible to appropriately prevent the rear surface of the seat pad from rubbing against the peripheral edges of the relief portions of the panel frame. [Brief description of the drawings]

[0014] [Figure 1] 1 is a perspective view illustrating a schematic configuration of a seat cushion according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the seat pad detached from the panel frame. [Diagram 3] FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 5 is a cross-sectional view corresponding to FIG. 4, illustrating a state in which the seat pad is bent due to sitting on the seat. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] First Embodiment (Schematic configuration of seat cushion 1) First, the configuration of a seat cushion 1 according to a first embodiment of the present invention will be described with reference to Figures 1 to 5. In the following description, when directions such as front, back, up, down, left and right are indicated, they refer to the respective directions shown in each figure.

[0017] Furthermore, when a direction is indicated with "seat" affixed thereto, such as the "seat width direction," it refers to the respective direction based on the seat cushion 1. Furthermore, in the following description, when a specific reference figure is not indicated or when there is no reference symbol corresponding to a reference figure, any of Figures 1 to 5 will be appropriately referred to.

[0018] As shown in Fig. 1, a seat cushion 1 according to this embodiment is configured as a seating portion for a rear seat of an automobile. The seat cushion 1 is installed on the floor of the automobile (not shown). The seat cushion 1 has a metal seat frame 2 forming the framework thereof, a urethane foam seat pad 3 installed on the upper part of the seat frame 2, and a seat cover (not shown) that covers the seat pad 3 from the surface side of the pad.

[0019] The seat frame 2 has a pair of left and right long plate-shaped side frames 2A extending in the front-rear direction of the seat along the left and right sides of the seat cushion 1. The seat frame 2 also has a round pipe-shaped front pipe 2B extending in the seat width direction along the front side of the seat cushion 1. The seat frame 2 also has a round pipe-shaped rear pipe 2C extending in the seat width direction along the rear side of the seat cushion 1.

[0020] The front pipe 2B is connected to span between the front ends of the pair of left and right side frames 2A in the seat width direction, and the rear pipe 2C is connected to span between the rear ends of the pair of left and right side frames 2A in the seat width direction.

[0021] The seat frame 2 also has a round pipe-shaped front rod 2D and a rear rod 2E that are connected so as to span in the seat width direction between the middle parts of the pair of left and right side frames 2A in the seat front-rear direction. As described above, the seat frame 2 is configured to be assembled in a ladder shape in a plan view.

[0022] The seat frame 2 also has a panel frame 2F, which is rectangular in plan view and is connected so as to span between the front pipe 2B and the rear rod 2E in the front-rear direction of the seat. The panel frame 2F is welded at its front edge to abut against the front pipe 2B from above, and at its rear edge to abut against the rear rod 2E from above.

[0023] The panel frame 2F is welded so that its middle part in the seat front-rear direction abuts against the front rod 2D from above. As a result, the panel frame 2F is supported by the three members, the front pipe 2B, the front rod 2D, and the rear rod 2E, from the rear side of the frame at three locations in the seat front-rear direction across the entire area in the seat width direction.

[0024] The seat frame 2 functions as a pad receiving portion that supports the seat pad 3 installed on the upper portion from the back side of the pad. Specifically, the seat frame 2 supports each top plate side (both side portions in the seat width direction) of the seat pad 3 from the back side of the pad with its pair of left and right side frames 2A.

[0025] In addition, the seat frame 2 supports the main top plate (the central portion in the seat width direction) of the seat pad 3 from the back side of the pad through its panel frame 2F. In detail, the panel frame 2F supports the buttocks and thighs of the seated occupant in a planar manner from the back side of the pad via the seat pad 3.

[0026] The seat frame 2 is configured such that a battery mounted on the floor (not shown) is disposed adjacent to and directly below the panel frame 2F. Therefore, the seat frame 2 is configured to firmly support the seat pad 3 by the panel frame 2F, which has less bending compared to a spring, to minimize bending of the seat pad 3 toward the rear side of the frame.

[0027] However, if the support of the seat pad 3 by the seat frame 2 is too hard over the entire area, the feeling of hitting the bottom will easily occur, especially in the part supporting the ischial bones where the seat pressure is high. This problem becomes more pronounced when the thickness of the seat pad 3 cannot be sufficiently secured due to the thinning of the seat cushion 1.

[0028] In order to reduce this bottoming out feeling, the seat pad 3 and the panel frame 2F are structured to reduce the bottoming out feeling even if the pad is thin. Specifically, as shown in Figures 2 to 4, the seat pad 3 has a pair of ischium support parts 3A that support the left and right ischium of the seated occupant, and a pad back recess 3B that is recessed in a concave shape is formed on the back surface of the pad.

[0029] These pad rear recesses 3B are not only in the areas corresponding to the rear surfaces of the pads of the left and right ischium support parts 3A, but also extend in an elliptical shape beyond the left and right ischium support parts 3A in the seat front-rear direction. These pad rear recesses 3B are recessed into a concave curved surface in cross section. More specifically, these pad rear recesses 3B are recessed deepest in the areas corresponding to the rear surfaces of the pads of the left and right ischium support parts 3A, and the recesses become gradually shallower as they extend from there in the seat front-rear direction.

[0030] In addition, the panel frame 2F is formed with a pair of left and right through holes F1 that penetrate the panel frame 2F in the form of an elongated hole extending in the front-rear direction at locations directly below the left and right ischial support portions 3A of the seat pad 3. Here, each through hole F1 corresponds to the "relief portion" of the present invention. In addition to each through hole F1, the panel frame 2F is formed with a plurality of lightening holes F2 in the form of a round hole that lightens the mass so as not to affect the performance of the panel frame 2F. Each through hole F1 is formed in the form of an elongated hole that is longer in the front-rear direction than each lightening hole F2.

[0031] 3 and 4, the above configuration allows the left and right ischium support parts 3A to bend easily toward the back side of the pad when the seat pad 3 receives a sitting load from the front side of the pad. Specifically, as shown in Fig. 5, when the seat pad 3 receives a sitting load from the front side of the pad, the left and right ischium support parts 3A bend so as to crush the recesses of the pad back recesses 3B toward the back side of the pad.

[0032] In addition, the through holes F1 formed in the panel frame 2F are disposed at locations directly below the left and right sit bone support portions 3A of the seat pad 3. Therefore, even if the left and right sit bone support portions 3A of the seat pad 3 are bent toward the back side of the pad due to the load of sitting, the left and right sit bone support portions 3A can pass through the through holes F1 to the lower side of the seat without hitting the panel frame 2F. As a result, it is possible to prevent the sit bone support portions 3A of the seat pad 3 from feeling like they are bottoming out.

[0033] Specifically, as shown in Fig. 2, the left and right pad back recesses 3B of the seat pad 3 are not connected to each other and are separated from each other. Therefore, as shown in Fig. 3, the portion between the left and right ischial support portions 3A of the seat pad 3 is supported from the back side of the pad by the first pad support portion F3 between each through hole F1 of the panel frame 2F. The support by the first pad support portion F3 can prevent each ischial support portion 3A of the seat pad 3 from bottoming out.

[0034] 4, the left and right side support parts 3C of the seat pad 3, which are offset from the left and right pad back recesses 3B to the outside in the seat width direction, are supported from the back side of the pad by the left and right second pad support parts F4, which are offset from the left and right through holes F1 of the panel frame 2F to the outside in the seat width direction. Therefore, the seat pad 3 can be configured to be less likely to wobble left and right.

[0035] 3, the pair of through holes F1 formed in the panel frame 2F are arranged so as to be contained in a formation area of ​​a pair of pad back recesses 3B formed in the seat pad 3 in a plan view. Therefore, it is possible to appropriately prevent the pad back surface of the seat pad 3 from rubbing against the periphery of each through hole F1 of the panel frame 2F.

[0036] To summarize the above, the seat cushion 1 according to this embodiment has the following configuration. Note that, in the following, the reference characters in parentheses are reference characters corresponding to the respective configurations shown in the above embodiment.

[0037] That is, the seat cushion (1) has a seat pad (3) and a planar panel frame (2F) that supports the seat pad (3) from the back side of the pad. The seat pad (3) has a pair of ischium support parts (3A) that support the left and right ischium of a seated occupant, and a pair of concave pad back recesses (3B) formed on the back side of the pad of the pair of ischium support parts (3A). The panel frame (2F) has a pair of relief parts (F1) that are recessed or form through holes (F1) on the back side of the frame directly below the pair of ischium support parts (3A), and a first pad support part (F3) that supports the seat pad (3) from the back side of the pad between the pair of relief parts (F1).

[0038] According to the above-mentioned configuration, the left and right pad back recesses (3B) formed on the back surface of the seat pad (3) make it easier to flex the left and right ischial support parts (3A) of the seat pad (3). Furthermore, the relief parts (F1) formed directly below the ischial support parts (3A) of the panel frame (2F) can prevent the ischial support parts (3A) of the seat pad (3) from hitting the panel frame (2F) even if they flex due to the seating load. As a result, it is possible to prevent the ischial support parts (3A) of the seat pad (3) from feeling like they are bottoming out. Furthermore, the first pad support parts (F3) of the panel frame (2F) support the spaces between the ischial support parts (3A) of the seat pad (3) from the back side of the pad, so that the ischial support parts (3A) of the seat pad (3) do not bottom out.

[0039] In addition, the pair of relief portions (F1) are through holes (F1). According to the above configuration, even if sufficient space cannot be secured on the rear side of the frame due to restrictions such as a battery being mounted directly below the panel frame (2F), the pair of relief portions (F1) can be appropriately provided in the panel frame (2F).

[0040] The panel frame (2F) further has a pair of second pad support parts (F4) that support a pair of side support parts (3C) of the seat pad (3) that are offset from the pair of pad rear recesses (3B) of the seat pad (3) to the outside in the seat width direction from the rear side of the pad. In this way, the pair of second pad support parts (F4) of the panel frame (2F) support each side support part (3C) of the seat pad (3) from the rear side of the pad, thereby making it possible to configure the seat pad (3) so that it is less likely to wobble from side to side.

[0041] In addition, the pair of relief portions (F1) formed in the panel frame (2F) are arranged to fit in a plan view within a formation area of ​​a pair of pad rear recesses (3B) formed in the seat pad (3). According to the above configuration, it is possible to appropriately prevent the pad rear surface of the seat pad (3) from rubbing against the peripheral edges of the relief portions (F1) of the panel frame (2F).

[0042] Other embodiments Although one embodiment of the present invention has been described above, the present invention can be embodied in various forms other than the above embodiment.

[0043] 1. The seat cushion of the present invention is applicable to seats installed in vehicles such as automobiles and trains, as well as seats installed in vehicles other than vehicles such as aircraft and ships. The seat cushion is also applicable to seats other than those of vehicles.

[0044] 2. The recess shape of the pair of pad rear recesses formed on the back surface of the seat pad may be a concave curved surface or a curved surface. Also, the pair of pad rear recesses may each be composed of a single recess or multiple recesses.

[0045] 3. The pair of relief parts formed in the panel frame may be constituted by recesses recessed into the rear side of the frame, in addition to through holes. The pair of relief parts may be formed beyond the formation area of ​​the pair of rear-pad recesses formed in the seat pad in a plan view. By forming the pair of relief parts beyond the formation area of ​​the pair of rear-pad recesses in a plan view, it is possible to more widely avoid contact with each ischial support part of the seat pad. [Explanation of symbols]

[0046] 1 seat cushion 2 Seat frame 2A Side Frame 2B front pipe 2C Rear pipe 2D Front Rod 2E Rear Rod 2F Panel Frame F1 Through hole (relief) F2 Lightening Hole F3 First pad support F4 Second pad support 3 Seat pad 3A Sit bone support 3B Pad back recess 3C Side support

Claims

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

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

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

4. The seat cushion according to claim 1 or 2, The seat cushion is arranged so that a pair of the relief portions formed in the panel frame are contained in areas in which a pair of the pad rear recesses formed in the seat pad are formed in a plan view.

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