Seat for vehicle

Abstract

To make both compatible in reducing pressure added to the ischium of a seating person and in heightening rigidity of a plate-like member for supporting the seating person.SOLUTION: A seat for a vehicle (a seat (S) for a vehicle) has left-right side frames (11) separately arranged on the left and the right, a first support member (20) arranged between the left-right side frames (11) and supporting a seating person, and left-right second support members (30) connected to left-right both sides of the first support member (20), supported by the side frame at the end parts of left-right outsides, and supporting the seating person with the first support member (20). The first support member (20) is a plate-like member and has left-right ischium part through-holes (H2) formed in positions corresponding to the ischium of the seating person. The second support members (30) are at least partially positioned in a range of the ischium part through-holes (H2) in the longitudinal direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle seat to be installed in a vehicle such as an automobile. [Background technology]

[0002] For example, Patent Document 1 discloses a vehicle seat to be installed in a vehicle such as an automobile, which includes a cushion frame and a plate-shaped cushion panel that spans the front and rear of the cushion frame and supports a pad. In this technology, holes are formed in the cushion panel at positions corresponding to the seat bones of the seated person to release pressure applied around the seat bones of the seated person. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP2015-085840A [Patent Document 2] JP 2001-245744 A Summary of the Invention

[0004] However, in the conventional technology, a problem occurs in that the rigidity of the cushion panel is reduced by forming holes corresponding to the ischial bones and coccyx.

[0005] Therefore, an object of the present invention is to reduce the pressure applied to the area around the sitting bones and tailbone of a seated person while increasing the rigidity of the plate-shaped member that supports the seated person.

[0006] In order to solve the above-mentioned problems, the vehicle seat of the present invention comprises left and right side frames arranged at a distance from each other on the left and right, a first support member arranged between the left and right side frames and supporting an occupant, and left and right second support members connected to both the left and right sides of the first support member, with their outer left and right ends supported by the side frames and supporting the occupant together with the first support members. The first support member is a plate-like member having left and right seat bone through-holes formed at positions corresponding to the seat bones of a seated person. At least a portion of the second support member is located within the range of the ischium through hole in the front-rear direction.

[0007] According to this configuration, pressure around the ischial bones of the seated person can be released through the ischial bone through-hole, so that the pressure on the ischial bones of the seated person can be reduced. The second support member supported by the side frame supports both sides of the seated person's buttocks to thighs, so that the pressure around the ischial bones can be further reduced. In addition, because a part of the second support member is located within the range of the ischial bone through-hole in the front-rear direction, the area around the ischial bone through-hole of the first support member can be reinforced by the second support member supported by the side frame, so that the rigidity of the plate-like first support member can be increased. In addition, the occupant can be stably supported without feeling uncomfortable. Therefore, it is possible to reduce the pressure applied to the area around the seat bones of the seated occupant while increasing the rigidity of the plate-like member that supports the seated occupant.

[0008] The second support member may have a first connecting portion connected to the first support member, and the first connecting portion may be located within a range of the ischium through hole in the front-rear direction.

[0009] According to this, the area around the ischial portion through-hole of the first support member can be reinforced by the first connecting portion.

[0010] The second support member may have a second connecting portion connected to the first support member, and the second connecting portion may be located rearward of the ischium through-hole.

[0011] According to this, the first support member can be favorably supported by the second support member.

[0012] Also, a slit may be formed on the edge of the ischium through hole.

[0013] According to this, the area around the ischial bone through-hole is easily deformed by the slits, so that the pressure applied around the ischial bones of the seated person can be gradually reduced going towards the ischial bones.

[0014] In addition, the first support member may have a coccyx through hole formed at a position corresponding to the tailbone of a seated person, and a portion of the second support member may be located within the range of the coccyx through hole in the front-to-rear direction.

[0015] With this, pressure acting around the tailbone of a seated occupant can be released through the tailbone through-hole, and the area of ​​the first support member around the tailbone through-hole can be reinforced by the second support member.

[0016] In addition, the vehicle seat may further include a pair of connecting members arranged at a distance from each other in the fore-and-aft direction, each connecting the left and right side frames, and the first support member may include a plurality of wires stretched across the pair of connecting members and a resin plate connecting the plurality of wires.

[0017] According to this, since the first support member is reinforced with the wire, the rigidity of the first support member can be increased.

[0018] The second support member may have a first engagement portion that engages with the wire.

[0019] This allows the first support member and the second support member to be firmly connected via the wire.

[0020] The vehicle seat may further include cover members covering rear ends of the side frames from the left and right inner sides, and the second support member may be formed integrally with the cover members.

[0021] This can increase the rigidity of the second support member.

[0022] It is desirable that the slit extend in the left-right direction and be located within the range of the first connecting portion in the front-rear direction.

[0023] According to this, by overlapping the positions of the slit and the connecting portion in the front-rear direction, it is possible to suppress a decrease in the supporting force of the first supporting member.

[0024] The resin plate may have a second engagement portion that engages with the wire. In this case, it is preferable that the slit extends in the front-rear direction and at least a portion of the slit is located within a range of the second engagement portion in the front-rear direction.

[0025] According to this, by overlapping the positions of the slit and the second engagement portion in the front-rear direction, it is possible to suppress a decrease in the supporting force of the first support member.

[0026] In addition, the vehicle seat may further include a third support member that is more flexible than the first support member, and the third support member may be provided on the first support member so as to block at least a portion of the ischium through-hole.

[0027] This allows the third support member, which is more flexible than the first support member, to adequately support the seated occupant's ischial bones, and also allows pressure acting around the seated occupant's ischial bones to be released through the third support member provided in the ischial bone through hole.

[0028] In addition, the vehicle seat may further include a third support member that is more flexible than the first support member, and the third support member may be provided on the first support member so as to block at least a portion of the coccyx through-hole.

[0029] This allows the third support member, which is more flexible than the first support member, to adequately support the tailbone of the seated occupant, and also allows pressure applied to the area around the tailbone of the seated occupant to be released through the third support member provided in the tailbone through-hole. [Brief description of the drawings]

[0030] [Figure 1] 1 is a perspective view showing a vehicle seat according to an embodiment; [Diagram 2] FIG. 2 is a perspective view showing the structure around the cushion frame. [Diagram 3] 3(a) is a top view of the central support member and the rear support member, and FIG. 3(b) is a cross-sectional view taken along line II of FIG. [Figure 4] FIG. 4 is a cross-sectional view showing the structure around the connecting portion. [Diagram 5] 13 is a cross-sectional view showing a modified example of the connecting portion. FIG. [Figure 6] FIG. 11 is a perspective view showing a cushion frame according to a second embodiment. [Figure 7] FIG. 2 is a plan view showing the cushion frame. [Figure 8] FIG. 1A is an enlarged perspective view showing the structure around the second support member on the right side of the cushion frame, FIG. 1B is a cross-sectional view showing the relationship between the coccyx through-hole and the wire, and FIG. 1C is a cross-sectional view showing the angular relationship between the sixth, seventh and eighth surfaces. [Figure 9] FIG. 4 is a side view showing three fixing parts. [Figure 10] 1A is a cross-sectional view showing a first support member, and FIG. 1B is an enlarged cross-sectional view showing a structure around a rib. [Figure 11] FIG. 13 is a plan view showing a modified example in which four wires are used. [Figure 12] FIG. 13 is a perspective view showing a modified example in which a wire is engaged with a pan frame. [Figure 13] FIG. 13 is a perspective view showing a modified example in which a third support member is provided in the ischium through-hole and the coccyx through-hole. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In this specification, front, back, left, right, top and bottom are based on the front, back, left, right, top and bottom as seen from the perspective of a person sitting in the seat (seat occupant). As shown in FIG. 1, the vehicle seat of this embodiment is configured as a vehicle seat S to be installed in an automobile, and includes a seat cushion S1, a seat back S2, and a headrest S3.

[0032] 2, the seat cushion S1 includes a cushion frame F1 that constitutes the framework of the seat cushion S1. The seat cushion S1 is constructed by covering the cushion frame F1 with a cushion pad made of urethane foam or the like and a covering material made of fabric, leather, or the like.

[0033] The cushion frame F1 includes left and right side frames 11, a front frame 12, and a rear frame 13. The left and right side frames 11 are arranged spaced apart from each other. Each side frame 11 is mainly composed of a long, plate-like side frame body 11A made of a metal plate. A back frame (not shown) constituting the framework of the seat back S2 is rotatably attached to the rear end of the left and right side frame bodies 11A via a reclining mechanism. The seat back S2 is composed of a back frame, a back pad made of urethane foam or the like, and a skin material covering the back frame.

[0034] The front frame 12 and the rear frame 13 are disposed at a distance from each other in the front-rear direction. The front frame 12 includes a pan frame 12A made of a metal plate and a front pipe 12B made of a metal pipe. The pan frame 12A and the front pipe 12B connect the front ends of the left and right side frame bodies 11A (side frames 11) to each other. The rear frame 13 is made of a metal pipe material and connects the rear ends of the left and right side frame bodies 11A (side frames 11) together. Here, the front pipe 12B and the rear frame 13 correspond to a pair of connecting members.

[0035] The seat cushion S1 includes a first support member 20, left and right second support members 30, and left and right cover members 40. The cover members 40 are resin members that cover the rear ends of the side frames 11 from the left and right inner sides, and are formed integrally with the second support members 30. Note that since the seat cushion S1 has a substantially symmetrical structure, the following description will mainly describe the structure on one side in the left-right direction, and will omit a description of the structure on the other side as appropriate.

[0036] The first support member 20 is a plate-like member that supports a seated occupant from below via a cushion pad (not shown), and is disposed between the left and right side frames 11. The first support member 20 includes three wires W that are stretched across the front pipe 12B and the rear frame 13, and three resin plates PP that connect the wires W.

[0037] The three resin plates PP are arranged at intervals in the front-rear direction and are supported by three wires W extending in the front-rear direction.

[0038] The three wires W are made of metal and are arranged at intervals in the left-right direction. A covering member 60 is disposed at the front and rear ends of each of the three wires W. The covering member 60 is made of resin and is formed integrally with the wires W so as to cover and encase the substantially arc-shaped bent portions of the front and rear ends of the wires W. The covering member 60 is in the shape of a substantially C-shape tube with a slit formed in the left-right direction. The front and rear ends of each wire W are covered by the covering member 60. The front end of each wire W is engaged with the front pipe 12B, and the rear end is engaged with the rear frame 13.

[0039] The wire W disposed in the left-right center supports the left-right center of each resin plate PP. The wires W on both left-right sides support both left-right ends of each resin plate PP.

[0040] In the following description, the resin plate PP located at the front will also be referred to as the "front plate 21," the resin plate PP located in the center will also be referred to as the "central plate 22," and the resin plate PP located at the rearmost will also be referred to as the "rear plate 23."

[0041] The front plate 21 is formed in a flat plate shape and has a hole H1 through which a duct for a fan (not shown) passes. The holes H1 are formed at intervals on the left and right. The left and right holes H1 are each disposed between the central wire W and the wires W on both the left and right sides. The left and right ends of the front plate 21 are not connected to the side frames 11 and are supported only by the wires W.

[0042] The front plate 21 is disposed at an angle with respect to the horizontal plane so that the rear end is positioned higher than the front end. The front end of the front plate 21 is positioned higher than the central plate 22.

[0043] The central plate 22 is formed in a flat plate shape and is disposed approximately parallel to the horizontal plane. The central plate 22 is located at the lowest of the three resin plates PP, and has left and right ischium through-holes H2 formed at positions corresponding to the ischium of the seated occupant. In other words, the ischium through-holes H2 are provided in the lowest part of the surface of the first support member 20 that supports the seated occupant.

[0044] Each ischium through-hole H2 is a long hole that is long in the front-rear direction, and is arranged at intervals in the left-right direction. The left and right ischium through-holes H2 are disposed between the central wire W and the wires W on both the left and right sides, one each. The area of ​​each ischium through-hole H2 may be, for example, 20 to 36 cm2. The size of the ischium through-hole H2 in the front-rear direction may be 70 to 90 mm, and the size in the left-right direction may be 40 to 60 mm. If the ischium through-hole H2 is too small, pressure from the ischium cannot be sufficiently released, and if it is too large, the support force decreases.

[0045] 3(a), two notches 22A opening outward in the left-right direction are formed on each of the left and right ends of the center plate 22. The wires W are arranged so as to cross each of the notches 22A.

[0046] Three second engagement portions 22B are formed on each of the left and right ends of the central plate 22, with three second engagement portions 22B arranged on either side of the notch 22A. As shown in Fig. 4, each second engagement portion 22B protrudes downward from the lower surface of the central plate 22, is formed in a U-shape in cross section that opens downward, and engages with the wire W. The left and right ends of the central plate 22 are inclined with respect to the horizontal plane, and the upper surfaces thereof are approximately flush with the upper surface of a second portion 32 of a second support member 30 described later.

[0047] Returning to Fig. 3(a), six slits SL are formed on the edge of each ischial through-hole H2. Each slit SL passes through the central plate 22 in the up-down direction, and one end is connected to and opens into the ischial through-hole H2. The slits SL extend in the front-to-rear direction, one on each of the front and rear edges of the arc-shaped ischial through-hole H2, and two on each of the left and right edges, extending in the left-to-right direction.

[0048] At least a portion of the slit SL extending in the front-rear direction is located within the range of the second engagement portion 22B in the front-rear direction. In this embodiment, the entire slit SL extending in the front-rear direction is located within the range of the second engagement portion 22B in the front-rear direction. This makes it possible to suppress a decrease in the support force of the first support member 20 by overlapping the front-rear positions of the slit SL and the second engagement portion 22B. Note that, in this example, both the slit SL at the front edge and the slit SL at the rear edge overlap the second engagement portion 22B in the front-rear direction, but the support force of the first support member 20 may be adjusted by having only one of them overlap the second engagement portion 22B in the front-rear direction.

[0049] Each slit SL extending in the left-right direction is located within the range of the connecting parts 34A, 34B in the front-rear direction. This makes it possible to suppress a decrease in the supporting force of the first support member 20 by overlapping the front-rear positions of the slits SL and the connecting parts 34A, 34B. Note that, although all of the multiple slits SL extending in the left-right direction are located within the range of the connecting parts 34A, 34B in the front-rear direction in this example, the supporting force of the first support member 20 may be adjusted by using a configuration in which only some of the slits SL are located within the range of the connecting parts 34A, 34B in the front-rear direction.

[0050] As shown in FIG. 3(b), a peripheral portion H21 of the ischium through-hole H2 in which each slit SL is formed is inclined downward toward the center of the ischium through-hole H2.

[0051] As shown in FIG. 3(a), the rear panel 23 is formed in a flat plate shape and is disposed at an angle with respect to the horizontal plane so that the rear end is located higher than the front end. The rear end of the rear panel 23 is located higher than the central panel 22. The rear panel 23 has one coccyx through hole H3 formed at a position corresponding to the tailbone of the seated person. The coccyx through hole H3 is located at the center in the left-right direction of the rear panel 23. The coccyx through hole H3 is located behind each of the ischium through holes H2, and its center in the left-right direction is located between each of the ischium through holes H2 in the left-right direction. The coccyx through hole H3 is a hole having a substantially triangular shape when viewed from above, and is disposed so that one corner faces forward.

[0052] The area of ​​the coccyx through hole H3 can be, for example, 6 to 12 cm2. The size of the coccyx through hole H3 in the front-to-back direction can be 25 to 35 mm, and the size in the left-to-right direction can be 30 to 40 mm. If the coccyx through hole H3 is too small, it cannot sufficiently release pressure from the coccyx, and if it is too large, the support force decreases.

[0053] A notch 23A opening outward in the left-right direction is formed on each of the left and right ends of the rear plate 23. The wire W is disposed so as to cross the notch 23A.

[0054] Two second engagement portions 23B are formed on each of the left and right ends of the rear plate 23, with the notch 23A sandwiched between them. Each second engagement portion 23B has the same structure as the second engagement portion 22B described above, and engages with the wire W. Although not shown, engagement portions having the same structure as the second engagement portions 22B, 23B are formed on each of the left and right ends of the front plate 21 and the left and right centers of each resin plate PP.

[0055] The left and right second support members 30 are made of resin and support a seated occupant together with the first support member 20. The second support members 30 are separate from the first support member 20, and one is disposed on each of the left and right sides of the first support member 20, more specifically, the center panel 22 and the rear panel 23.

[0056] The second support member 30 is disposed behind the center in the front-rear direction of the side frame 11. The second support member 30 has a first portion 31 disposed on the side frame 11, a second portion 32 extending obliquely inward and downward in the left-right direction from the first portion 31, and three connecting portions 34A, 34B, 34C formed at an end portion on the inner side in the left-right direction of the second portion 32.

[0057] The first portion 31 is a plate-like portion and is connected to the side frame 11 by bolts, resin claws, clips, etc. A rear end portion of the first portion 31 is integrally formed with the cover member 40. A portion of the first portion 31 is located within the range of the ischium through-hole H2 in the front-rear direction.

[0058] The second portion 32 is a plate-like portion for supporting both sides of the seated occupant's buttocks to thighs, and is inclined with respect to the horizontal plane so as to support the seated occupant's buttocks from diagonally below. A rear end portion of the second portion 32 is formed integrally with the cover member 40. A portion of the second portion 32 is located within the range of the ischium through-hole H2 in the front-rear direction.

[0059] The three connecting portions 34A to 34C are portions that are connected to the first support member 20 (the central plate 22 or the rear plate 23). The three connecting portions 34A to 34C are connected to the first support member 20 to support the first support member 20. The two front connecting portions 34A, 34B are an example of a first connecting portion, and are located within the range of the ischium through-hole H2 in the front-rear direction. In other words, a part of the second support member 30 is located within the range of the ischium through-hole H2 in the front-rear direction. The two front connecting portions 34A, 34B are connected to the central plate 22 via a wire W.

[0060] The rearmost connecting portion 34C is an example of a second connecting portion, and is located behind the ischium through hole H2. More specifically, the connecting portion 34C is located within the range of the coccyx through hole H3 in the front-rear direction. In other words, a portion of the second support member 30 is located within the range of the coccyx through hole H3 in the front-rear direction. The rearmost connecting portion 34C is connected to the rear plate 23 via a wire W.

[0061] The connecting portions 34A to 34C are disposed in the respective notches 22A, 23A (see FIG. 3) of the respective plates 22, 23. Note that the connecting structures between the connecting portions 34A to 34C and the respective plates 22, 23 are substantially the same, and therefore, in the following description, the structure of the connecting portion 34A will be representatively described.

[0062] 4, the connecting portion 34A engages with the wire W located in the notch 22A. The connecting portion 34A mainly includes a first wall A11 extending downward from the second portion 32, a second wall A12 extending inward in the left-right direction from a lower end of the first wall A11, and a hook A13 as an example of a first engaging portion extending upward from an end of the second wall A12 on the inner left-right direction. The hook A13 has a hook shape with an upper end protruding outward in the left-right direction, and this hook-shaped upper end engages with the wire W.

[0063] A restricting portion A14 is formed at approximately the center in the vertical direction of the first wall A11, extending toward the wire W that engages with the hook A13. The restricting portion A14 is a portion that restricts the wire W from coming off the hook A13, and the distance between the restricting portion A14 and the tip of the hook A13 is smaller than the diameter of the wire W.

[0064] In addition, a guide rib A15 is formed between the first wall A11 and the hook A13 to guide the wire W toward the tip of the hook A13. The guide rib A15 is a plate-shaped portion having a surface perpendicular to the front-rear direction, and is formed to connect the first wall A11, the second wall A12, and the hook A13. The upper end of the guide rib A15 extends obliquely from the upper end of the first wall A11 toward the inside and the lower side in the left-right direction, and then extends toward the inside in the left-right direction so as to pass under the wire W engaged with the hook A13 and extend to the hook A13. The number of guide ribs A15 is arbitrary, but it is preferable to arrange a plurality of guide ribs A15 at intervals in the front-rear direction, for example.

[0065] Next, a method for attaching the first support member 20 and the second support member 30 to the cushion frame F1 will be described. 2, first, the second support members 30 are attached to the left and right side frames 11 by a method such as engagement or bolt fastening. After that, the covering members 60 integrally formed at the ends of the three wires W are attached to the front pipe 12B and the rear frame 13 by being pushed into the front pipe 12B and the rear frame 13 from above and fitted thereto.

[0066] Thereafter, the wire W is pressed from above into the connecting portions 34A-34C of the left and right second support members 30 to engage them. Finally, the second engagement portions 22B, 23B of the resin plates PP are pressed from above into the wire W to engage them. In this manner, the support members 20, 30 can be attached to the cushion frame F1.

[0067] As described above, according to this embodiment, the following effects can be obtained. By forming the ischial through-hole H2 in the central plate 22, pressure around the ischial bones of the seated person can be released through the ischial through-hole H2, thereby reducing the pressure around the ischial bones of the seated person. The second support member 30 supports both sides of the seated person's buttocks to thighs, thereby further reducing the pressure around the ischial bones. In addition, because a part of the second support member 30 (the front connecting parts 34A, 34B) is located within the range of the ischial through-hole H2 in the front-rear direction, the area around the ischial through-hole H2 of the central plate 22 can be reinforced by the second support member 30, thereby increasing the rigidity of the plate-shaped central plate 22.

[0068] Since the second support member 30 has the connecting portion 34C that is connected to the rear panel 23 at a position rearward of the ischium through-hole H2, the second support member 30 can support the rear panel 23 well.

[0069] By forming slits SL on the edge of the ischial through hole H2, the area around the ischial through hole H2 can be easily deformed by the slits SL, so that the pressure applied around the ischial bones of the seated person can be gradually reduced toward the ischial bones.

[0070] Since the rear panel 23 has the coccyx through hole H3, pressure on the tailbone of the seated person can be released through the coccyx through hole H3. Also, since a part of the second support member 30 is located within the range of the coccyx through hole H3 in the front-rear direction, the area of ​​the rear panel 23 around the coccyx through hole H3 can be reinforced by the second support member 30.

[0071] Since the first supporting member 20 has the second engaging portions 22B, 23B that engage with the wire W, the first supporting member 20 can be supported by the wire W in an excellent manner.

[0072] Since the second support member 30 has a hook A13 that engages with the wire W, the first support member 20 and the second support member 30 can be firmly connected via the wire W. Furthermore, by connecting the first support member 20 and the second support member 30 via the wire W in this manner, when a load is applied to the first support member 20, the left and right ends of the first support member 20 rotate about the wire W, so that the amount of vertical movement of the first support member 20 can be increased, thereby improving the sitting comfort of the seated occupant.

[0073] Since the second support member 30 is formed integrally with the cover member 40, the rigidity of the second support member 30 can be increased.

[0074] The front plate 21, 121, the central plate 22, 122, and the rear plate 23, 123 are widely spaced apart, so that they do not interfere with each other even if a large load is applied when a person sits down. In addition, compared to a case in which the front plate 21, 121, the central plate 22, 122, and the rear plate 23, 123 are made of a single resin plate, the load of the seated person is received by three resin plates, so that more appropriate load distribution can be achieved. The distance between the front panels 21, 121, central panels 22, 122, and rear panels 23, 123 takes into consideration the body type and weight of a large occupant and is set to a distance that prevents the resin panels from interfering with each other when the occupant is seated.

[0075] Although the embodiment of the present invention has been described above, the present invention can be implemented by appropriately modifying it as shown in the following other embodiments.

[0076] In the embodiment, the second engagement portion 22B protrudes from the lower surface of the central plate 22, but the present invention is not limited to this. For example, as shown in Fig. 5, the second engagement portion 22B may protrude from the upper surface of the central plate 22. Note that the other engagement portions may also protrude from the upper surfaces of the resin plates in a similar manner.

[0077] Moreover, the vehicle seat S may be configured as in a second embodiment described below. In the second embodiment, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0078] 6 and 7, the vehicle seat S according to the second embodiment includes a first support member 120 and a second support member 130 that are different from those in the above embodiment. In the second embodiment, the wire W has a front end engaged with the front pipe 12B and a rear end engaged with the rear frame 13.

[0079] The first support member 120 includes a front plate 121, a central plate 122, and a rear plate 123. The front plate 121, the central plate 122, and the rear plate 123 are each formed in a rectangular plate shape.

[0080] The front plate 121 differs from the previous embodiment in that it does not have the above-mentioned hole H1 (see FIG. 2).

[0081] The central plate 122 is bent based on a first fold line L1 and a second fold line L2. The first fold line L1 is a line along the left-right direction and is arranged so as to pass through the left and right ischium through-holes H2. More specifically, the first fold line L1 is arranged rearward of the center of the ischium through-hole H2 in the front-rear direction. The first fold line L1 is also arranged so as to pass through slits SL that are arranged in the left and right linear portions of the ischium through-hole H2, which is a long hole.

[0082] The second fold lines L2 are provided on both the left and right ends of the central plate 122. The right second fold line L2 has a portion extending diagonally forward and rightward from the right end of the first fold line L1 and connecting to the right end of the central plate 122, and a portion extending rearward along the front-to-rear direction from the right end of the first fold line L1 and connecting to the rear end of the central plate 122. The left second fold line L2 is configured to be substantially symmetrical with the right second fold line L2.

[0083] The upper surface of the central plate 122 has a first surface SF1, a second surface SF2, and two third surfaces SF3. The first surface SF1 is inclined relative to the second surface SF2 with respect to the first fold line L1, and the third surface SF3 is inclined relative to the first surface SF1 and the second surface SF2 with respect to the second fold line L2.

[0084] 10(a), the first surface SF1 is an inclined surface extending obliquely upward and forward from the front end (first folded line L1) of the second surface SF2, and is disposed so as to be substantially flush with the upper surface 121A of the front plate 121. The second surface SF2 extends substantially horizontally rearward from the rear end of the first surface SF1.

[0085] 6 and 7, the left and right third surfaces SF3 are disposed on the outer side in the left-right direction with respect to the left and right second fold lines L2. The right third surface SF3 is an inclined surface extending obliquely upward to the right from the right second fold line L2. The left third surface SF3 is configured to be substantially symmetrical with the right third surface SF3.

[0086] The right end of the upper surface of the center plate 122 is made up of the right end of the first surface SF1 and the right end of the third surface SF3. The left end of the upper surface of the center plate 122 is made up of the left end of the first surface SF1 and the left end of the third surface SF3. The rear end of the upper surface of the center plate 122 is made up of the rear end of the second surface SF2 and the rear ends of the left and right third surfaces SF3.

[0087] The rear panel 123 has a base portion 123A disposed substantially horizontally, a vertical wall portion 123B extending diagonally upward and rearward from the rear end of the base portion 123A, and a plurality of ribs 123C connected to the base portion 123A and the vertical wall portion 123B. The multiple ribs 123C are arranged at intervals in the left-right direction.

[0088] The base portion 123A has a tailbone through-hole H3 similar to the previous embodiment. In this embodiment, the middle wire W of the three wires W, specifically the wire W that crosses the tailbone through-hole H3 from front to back, has a portion corresponding to the tailbone through-hole H3 formed in a shape as shown in Fig. 8(b). More specifically, the wire W has two support portions W1 that support the front and rear portions of the tailbone through-hole H3, and a concave portion W2 that is concave downward.

[0089] The concave portion W2 has a front portion W21 extending diagonally downward and rearward from the front support portion W1, a bottom portion W22 extending rearward from the lower end of the front portion W21, and a rear portion W23 extending diagonally upward and rearward from the rear end of the bottom portion W22 to connect to the rear support portion W1. The front portion W21 overlaps with the front end of the tailbone through hole H3 when viewed from the top-bottom direction. The rear portion W23 overlaps with the rear end of the tailbone through hole H3 when viewed from the top-bottom direction. By forming such a concave portion W2 in the wire W, it is possible to reduce the pressure applied to the tailbone of the seated person from the vehicle seat S.

[0090] 6 and 7, the base portion 123A is bent based on the left and right third fold lines L3. The left and right third fold lines L3 are lines along the front-rear direction and are disposed on extensions of the left and right second fold lines L2.

[0091] The upper surface of the base portion 123A has a fourth surface SF4 and two fifth surfaces SF5. The two fifth surfaces SF5 are each bent relative to the fourth surface SF4 with respect to a third folding line L3.

[0092] The fourth surface SF4 is a surface that extends substantially horizontally, and is disposed so as to be substantially flush with the second surface SF2 of the central plate 122 (see FIG. 10(a)).

[0093] The left and right fifth surfaces SF5 are disposed on the outer side in the left-right direction with respect to the left and right third fold lines L3. The right fifth surface SF5 is an inclined surface extending obliquely upward to the right from the right third fold line L3. The left fifth surface SF5 is configured to be substantially symmetrical with the right fifth surface SF5.

[0094] 10(b), the vertical wall portion 123B has a recess B1 at its lower portion, which recesses diagonally downward and rearward. The recess B1 extends from the right end to the left end of the vertical wall portion 123B.

[0095] The rib 123C protrudes upward from the bottom of the recess B1. The upper surface of the rib 123C has a curved surface that smoothly connects the front surface of the vertical wall portion 123B and the upper surface of the base portion 123A.

[0096] 6, the right-side second support member 130 has a first portion 131 disposed on the side frame 11, a second portion 132 extending inwardly and downwardly in the left-right direction from the first portion 131, and three connecting portions 134A, 134B, 134C formed on an inner end portion in the left-right direction of the second portion 132. The rear ends of the first portion 131 and the second portion 132 are integrally formed with a cover member 140 that covers the rear end portion of the side frame 11 from the inner left and right sides.

[0097] As shown in Fig. 8(a), the second portion 132 is folded based on a fourth fold line L4, a fifth fold line L5, and a sixth fold line L6. The fourth fold line L4 extends obliquely downward from the rear of the upper end of the second portion 132 to the front end of the second portion 132. The fifth fold line L5 extends substantially along the front-rear direction at a position inside and below the fourth fold line L4 in the left-right direction. The sixth fold line L6 extends substantially along the front-rear direction at a position inside and below the fifth fold line L5 in the left-right direction.

[0098] The inner surface of the second portion 132 has a sixth surface SF6, a seventh surface SF7, an eighth surface SF8, and a ninth surface SF9. The seventh surface SF7 is inclined with respect to the sixth surface SF6 with respect to the fourth fold line L4. The eighth surface SF8 is inclined with respect to the seventh surface SF7 with respect to the fifth fold line L5. The ninth surface SF9 is inclined with respect to the eighth surface SF8 with respect to the sixth fold line L6.

[0099] The sixth surface SF6 is an inclined surface that slopes inwardly and downwardly from the inner end of the first portion 131 in the left-right direction, and forms a first angle θ1 with respect to the horizontal plane (see FIG. 8(c)).

[0100] The seventh surface SF7 is an inclined surface that slopes inwardly and downwardly in the left-right direction from the lower end of the sixth surface SF6, and its angle with respect to the horizontal plane is a second angle θ2 that is larger than the first angle θ1 (see FIG. 8(c)).

[0101] The eighth surface SF8 is an inclined surface that slopes downward and inward in the left-right direction from the lower end of the seventh surface SF7, and its angle with respect to the horizontal plane is a third angle θ3 that is smaller than the first angle θ1 (see FIG. 8(c)). In other words, the relationship between the above-mentioned angles is θ3<θ1<θ2. Furthermore, the eighth surface SF8 is disposed so as to be substantially flush with the above-mentioned third surface SF3 and fifth surface SF5.

[0102] The ninth surface SF9 extends downward from the lower end of the eighth surface SF8. The ninth surface SF9 has three connecting portions 134A, 134B, and 134C and two protruding portions P1 and P2. In the following description, the three connecting portions 134A, 134B, and 134C are also referred to as the first connecting portion 134A, the second connecting portion 134B, and the third connecting portion 134C, respectively, and the two protruding portions P1 and P2 are also referred to as the first protruding portion P1 and the second protruding portion P2, respectively.

[0103] The three connecting portions 134A, 134B, 134C are portions connected to the wire W, and protrude from the lower portion of the ninth face SF9 toward the first support member 120. The first connecting portion 134A is disposed at the front end of the ninth face SF9, the third connecting portion 134C is disposed at the rear end of the ninth face SF9, and the second connecting portion 134B is disposed between the first connecting portion 134A and the third connecting portion 134C. The distance from the first connecting portion 134A to the second connecting portion 134B is smaller than the distance from the second connecting portion 134B to the third connecting portion 134C.

[0104] The two protrusions P1, P2 protrude from the ninth face SF9 toward the first support member 120 and are formed from the upper end to the lower end of the ninth face SF9. The first protrusion P1 is disposed between the first connecting portion 134A and the second connecting portion 134B.

[0105] The first protrusion P1 has a greater length in the front-rear direction than the second protrusion P2. More specifically, the length in the front-rear direction of the first protrusion P1 is approximately the same as the distance between the first connecting portion 134A and the second connecting portion 134B.

[0106] The second protrusion P2 is disposed between the second connecting portion 134B and the third connecting portion 134C. The distance from the second protrusion P2 to the second connecting portion 134B is greater than the distance from the second protrusion P2 to the third connecting portion 134C.

[0107] The second support member 130 on the left side may be configured to have a slightly different shape from the second support member 130 on the right side, or may be configured to be symmetrical.

[0108] 9, the part AS formed by integrating the second support member 130 and the cover member 140 has an upper wall AS1 disposed on the side frame 11, a rear wall AS2 disposed behind the side frame 11, a first fixing portion 71, a second fixing portion 72, and a third fixing portion 73. The upper wall AS1 is a portion including the above-mentioned first portion 131, and its rear portion is inclined obliquely upward and rearward. The rear wall AS2 extends in the vertical direction and has a curved shape that convexly faces rearward.

[0109] The first fixing portion 71 is disposed on the upper wall AS1, more specifically, on the front end of the first section 131. The first fixing portion 71 extends downward from the outer end in the left-right direction of the first section 131. A tip portion of the first fixing portion 71 engages with a side surface of the side frame 11.

[0110] The second fixing portion 72 is disposed rearward of the center of the upper wall AS1 in the front-rear direction. The second fixing portion 72 extends diagonally downward and rearward from the outer edge of the inclined portion of the upper wall AS1 in the left-right direction, and its tip portion engages with the side surface of the side frame 11.

[0111] The third fixing portion 73 is disposed on an upper portion of the rear wall AS2. The third fixing portion 73 extends forward from an outer end of the rear wall AS2 in the left-right direction and has a tip portion which engages with a side surface of the side frame 11.

[0112] The third fixed portion 73 is disposed at approximately the same position in the up-down direction as the second fixed portion 72. The second fixed portion 72 and the third fixed portion 73 are disposed above the first fixed portion 71. In addition, the third fixed portion 73 is disposed rearward of the second fixed portion 72, and the second fixed portion 72 is disposed rearward of the first fixed portion 71.

[0113] 7, the first fixing portion 71 and the first connecting portion 134A are disposed so as to overlap in the front-rear direction. Specifically, the front portion of the first fixing portion 71 is disposed within the range of the first connecting portion 134A in the front-rear direction. This makes it possible to increase the attachment rigidity between the first fixing portion 71 and the side frame 11 and between the first connecting portion 134A and the wire W.

[0114] The first fixing portion 71 and the ischium through-hole H2 are arranged so as to overlap in the front-rear direction. Specifically, the first fixing portion 71 is entirely arranged within the range of the ischium through-hole H2 in the front-rear direction. This can increase the attachment rigidity between the first fixing portion 71 and the side frame 11.

[0115] In the second embodiment described above, a portion of the first fixing portion 71 was positioned within the range of the first connecting portion 134A in the front-to-rear direction, but the present invention is not limited to this, and it is sufficient that at least a portion of the fixing portion is positioned within the range of the connecting portion in the front-to-rear direction, and for example, the entire fixing portion may be positioned within the range of the connecting portion in the front-to-rear direction.

[0116] In addition, in the second embodiment, the entire first fixing portion 71 is positioned within the range of the ischial through hole H2 in the front-to-back direction, but the present invention is not limited to this, and it is sufficient that at least a part of the fixing portion is positioned within the range of the ischial through hole in the front-to-back direction.

[0117] In the above-described embodiments, the number of wires W is three, but the present invention is not limited to this, and may be, for example, two, or four or more. Note that, for example, when two wires are used, the two wires may be disposed at both the left and right ends of the first support member.

[0118] As shown in Fig. 11, when there are four wires W, two of the four wires W may be disposed at both the left and right ends of the first support member 120, and the remaining two wires W may be disposed so as to cross the two ischial through-holes H2 from front to back. In this case, it is preferable that the portions of the two middle wires W that correspond to the ischial through-holes H2 are each formed into a concave portion W2 as shown in Fig. 8(b). This can reduce the pressure applied from the vehicle seat S to the ischial bones of the seated person.

[0119] As shown in FIG. 12, the front end of the wire W may be engaged with the pan frame 12A.

[0120] 13, the vehicle seat S may further include third support members 51, 52 that are more flexible than the first support member 120. The third support members 51, 52 may be made of, for example, a cloth-like member or rubber.

[0121] The third support members 51 are provided for the left and right ischium through-holes H2, one each. The third support members 51 are provided on the central plate 122 of the first support member 120 so as to completely cover the ischium through-holes H2.

[0122] The third support member 52 is provided to the tailbone through-hole H3. The third support member 52 is provided on the rear plate 123 of the first support member 120 so as to completely cover the tailbone through-hole H3.

[0123] This allows the third support members 51, 52, which are more flexible than the resin first support member 120, to adequately support the ischium and coccyx of the seated person, and also allows pressure applied to the area around the ischium and coccyx of the seated person to be released from the third support members 51, 52.

[0124] The third support member may be provided on the first support member so as to block at least a portion of the ischium through-hole. The third support member may be provided on the first support member so as to block at least a portion of the coccyx through-hole. Furthermore, the third support member may be provided by forming the ischium through-hole and the coccyx through-hole into a thin mesh shape when forming the first support member.

[0125] In the above embodiment, the first support member 20 and the second support member 30 are connected via a wire W, but the present invention is not limited to this, and the first support member and the second support member may be directly connected by a bolt or the like.

[0126] In the above embodiment, the second support member 30 is formed in a plate shape, but the present invention is not limited to this. For example, the second support member may be rod-shaped, such as a wire.

[0127] In the above embodiment, the coccyx through hole H3 is formed in the first support member 20, but the present invention is not limited to this, and the first support member may not have a coccyx through hole.

[0128] In the above embodiment, a portion of the second support member 30 is positioned within the range of the ischial through hole H2 in the front-to-back direction, but the present invention is not limited to this, and the entire second support member may be positioned within the range of the ischial through hole H2 in the front-to-back direction.

[0129] Furthermore, the shape of the engaging portion is not limited to a hook shape, but may be other shapes such as a U-shaped groove or a claw having a barbed tip.

[0130] In the above embodiment, an inclined surface is provided around the ischial portion through hole H2, but this inclined surface may be omitted. The edge of the ischial portion through hole H2 may not be provided with a slit SL. Furthermore, similar to the ischial portion through hole H2, a slit may be provided on the edge of the coccyx portion through hole H3, or an inclined surface may be provided around the coccyx portion through hole H3.

[0131] In the above embodiment, the front-to-rear position of the slit SL extending in the left-right direction overlaps with the connecting portions 34A, 34B, but the front-to-rear position of the slit SL extending in the left-right direction (at least one of them if there are multiple slits) may also be configured to overlap with the second engagement portion 22B.

[0132] In the above embodiment, the position of the slit SL extending in the front-rear direction overlaps with the second engagement portion 22B, but the position of the slit SL extending in the front-rear direction (at least one of them if there are multiple slits) may also be configured to overlap with the connecting portions 34A, 34B.

[0133] In the above embodiment, the ischial through hole, the coccyx through hole and the through hole are used as examples, but they may also be recessed, and an elastic member that is more easily flexible than the material constituting the resin plate may be provided in the portion corresponding to the through hole.

[0134] In the above embodiment, a vehicle seat S used in an automobile is used as an example of a vehicle seat, but the present invention is not limited to this and can also be applied to other vehicle seats, such as seats used in ships and aircraft.

[0135] The elements described in the above-mentioned embodiment and modified examples may be implemented in any combination.

Claims

1. Left and right side frames arranged at a distance from each other, a front frame and a rear frame connecting the left and right side frames; a first support member having an engagement portion that is engaged with the rear frame and supports a seated occupant; and left and right second support members arranged on both left and right sides of the first support member, with left and right outer ends arranged outside the engagement portion in the left and right direction, and supporting a seated occupant together with the first support member, the first support member is a plate-like member having a recess in the center of a rear end portion in the left-right direction, The recess has a shape that gradually narrows toward the front, A vehicle seat, wherein a portion of the second support member is located within the range of the recess in the front-rear direction.

2. The first support member has a pair of through holes spaced apart in the left-right direction, 2. The vehicle seat according to claim 1, wherein a center of the recess in the left-right direction is located between a pair of the through holes in the left-right direction.

3. The first support member has a wire stretched across the front frame and the rear frame, 3. The vehicle seat according to claim 1, wherein the recess overlaps with the wire.

4. A vehicle seat as described in claim 2, characterized in that the recess is located behind the pair of through holes.

5. The first support member has a hole through which a fan duct passes, The vehicle seat according to claim 2 , wherein the hole is aligned with the through hole in the front-rear direction.

6. The holes are provided in a pair spaced apart in the left-right direction, 6. The vehicle seat according to claim 5, wherein a center of the recess in the left-right direction is located between a pair of the holes in the left-right direction.

7. The first support member has a wire extending in the front-rear direction, The vehicle seat according to claim 2 , wherein the wire overlaps with the through hole.

8. The wires are provided in pairs spaced apart in the left-right direction, 8. The vehicle seat according to claim 7, wherein the recess is located between the pair of wires in the left-right direction.

9. A vehicle seat as described in claim 2, characterized in that the through hole is larger than the recess.

10. The first support member has a wire stretched across the front frame and the rear frame, The vehicle seat according to any one of claims 1 to 9, wherein the second support member is connected to the wire.

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