Vehicle seats

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 mounted on a vehicle such as an automobile.

Background Art

[0002] As a vehicle seat mounted on a vehicle such as an automobile, for example, Patent Document 1 discloses a seat including a cushion frame and a plate-like cushion panel that is bridged between the front and rear of the cushion frame and supports a pad. In this technology, holes are formed at positions corresponding to the sitting bones of the seated person in the cushion panel to release the pressure applied to the periphery of the sitting bones of the seated person.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

[0004] However, in the prior art, there is a problem that the rigidity of the cushion panel is reduced by forming holes corresponding to the sitting bones and the coccyx.

[0005] Therefore, an object of the present invention is to achieve both reducing the pressure applied to the periphery of the sitting bones and the coccyx of the seated person and increasing the rigidity of the plate-like member that supports the seated person. <000​​​​The first support member is a plate-shaped member and has left and right ischial bone-penetrating holes formed at positions corresponding to the ischial bones of a seated person. At least a portion of the second support member is located within the range of the ischial bone penetration hole in the front-rear direction.

[0007] This configuration allows pressure on the occupant's ischial tuberosities to be released through the ischial tuberosity penetration holes, thereby reducing the pressure on the occupant's ischial tuberosities. Furthermore, the second support member, supported by the side frame, supports both sides of the occupant's buttocks and thighs, further reducing the pressure on the ischial tuberosities. In addition, since a portion of the second support member is located within the range of the ischial tuberosity penetration holes in the front-to-back direction, the portion of the first support member around the ischial tuberosity penetration holes can be reinforced by the second support member supported by the side frame, thereby increasing the rigidity of the plate-shaped first support member. Moreover, it can support the occupant stably without causing discomfort. Therefore, it is possible to achieve both a reduction in the pressure applied around the seated person's ischial tuberosities and an increase in the rigidity of the plate-shaped member that supports the seated person.

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

[0009] According to this, the first connecting portion can reinforce the area around the ischial bone penetration hole of the first support member.

[0010] Furthermore, the second support member has a second connecting portion connected to the first support member, and the second connecting portion may be located behind the ischial bone through-hole.

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

[0012] Furthermore, a slit may be formed on the edge of the ischial tuberosity through-hole.

[0013] According to this, the area around the ischial tuberosity penetration hole becomes more easily deformable by the slit, so the pressure applied around the seated person's ischial tuberosities can be gradually reduced as it approaches the ischial tuberosities.

[0014] Furthermore, the first support member has a coccyx-penetrating hole formed at a position corresponding to the coccyx of the seated person, and a part of the second support member may be located within the range of the coccyx-penetrating hole in the front-rear direction.

[0015] According to this design, the pressure applied to the area around the tailbone of the seated person can be released through the coccyx-penetrating hole, and the area around the coccyx-penetrating hole of the first support member can be reinforced by the second support member.

[0016] Furthermore, the vehicle seat may be further provided with a pair of connecting members that are spaced apart from each other in the front-rear direction and connect 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 that connects the plurality of wires.

[0017] According to this, the first support member is reinforced with wire, which increases the rigidity of the first support member.

[0018] Furthermore, the second support member may have a first engaging portion that engages with the wire.

[0019] According to this, the first support member and the second support member can be firmly connected via a wire.

[0020] Furthermore, the vehicle seat may further include cover members that cover the rear end of the side frame from the left and right inner sides, and the second support member may be formed integrally with the cover member.

[0021] According to this, the rigidity of the second support member can be increased.

[0022] It is desirable that the slit extends in the left-right direction and is 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 support member.

[0024] In addition, the resin plate can have a second engaging portion that engages with the wire. In this case, it is desirable that the slit extends in the front-rear direction and at least a part of it is located within the range of the second engaging portion in the front-rear direction.

[0025] According to this, by overlapping the positions of the slit and the second engaging 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 further includes 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 part of the ischial bone portion through hole.

[0027] According to this, the third support member that is more flexible than the first support member can moderately support the ischial bone of the seated person, and the pressure applied to the periphery of the seated person's ischial bone can be released from the third support member provided in the ischial bone portion through hole.

[0028] In addition, the vehicle seat further includes 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 part of the coccyx portion through hole.

[0029] According to this, the third support member that is more flexible than the first support member can moderately support the coccyx of the seated person, and the pressure applied to the periphery of the seated person's coccyx can be released from the third support member provided in the coccyx portion through hole.

Brief Description of the Drawings

[0030] [Figure 1] This is a perspective view showing a vehicle seat according to an embodiment. [Figure 2] This is a perspective view showing the structure around the cushion frame. [Figure 3] Figure (a) shows the central support member and the rear support member viewed from above, and Figure (b) shows the II cross-sectional view of Figure 3(a). [Figure 4] This is a cross-sectional view showing the structure around the connecting part. [Figure 5] This is a cross-sectional view showing a modified example of the connecting portion. [Figure 6] This is a perspective view showing a cushion frame according to the second embodiment. [Figure 7] This is a plan view showing the cushion frame. [Figure 8] The images show a magnified perspective view (a) of the structure around the second support member on the right side of the cushion frame, a cross-sectional view (b) showing the relationship between the coccyx penetration hole and the wire, and a cross-sectional view (c) showing the relationship between the angles of the sixth, seventh, and eighth surfaces. [Figure 9] This is a side view showing the three fixing points. [Figure 10] (a) is a cross-sectional view showing the first support member, and (b) is a cross-sectional view showing a magnified view of the structure around the rib. [Figure 11] This is a plan view showing a modified example with four wires. [Figure 12] This is a perspective view showing a modified example in which the wire is engaged with the pan frame. [Figure 13] This is a perspective view showing a modified example in which a third support member is provided in the ischial tuberosity through-hole and the coccyx through-hole. [Modes for carrying out the invention]

[0031] Embodiments of the invention will be described below with reference to the attached drawings. In this specification, front, back, left, right, and up and down are based on the perspective of a person sitting in the seat (seated person). As shown in Figure 1, the vehicle seat of this embodiment is configured as a vehicle seat S to be installed in an automobile, and comprises a seat cushion S1, a seat back S2, and a headrest S3.

[0032] As shown in Figure 2, the seat cushion S1 has a cushion frame F1 built inside, which forms 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 surface material made of fabric or leather or the like.

[0033] The cushion frame F1 comprises left and right side frames 11, a front frame 12, and a rear frame 13. The left and right side frames 11 are spaced apart from each other. Each side frame 11 is mainly composed of a long, plate-shaped side frame body 11A made of metal. A back frame (not shown), which forms the skeleton of the seat back S2, is rotatably attached to the rear ends of the left and right side frame bodies 11A via a reclining mechanism. The seat back S2 is constructed by covering the back frame with a back pad made of urethane foam or the like and a surface material.

[0034] The front frame 12 and the rear frame 13 are positioned spaced apart from each other. The front frame 12 comprises a pan frame 12A made of metal plate and a front pipe 12B made of metal pipe material. 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). The rear frame 13 is made of metal pipe material and connects the rear ends of the left and right side frame bodies 11A (side frames 11). Here, the front pipe 12B and the rear frame 13 correspond to a pair of connecting members.

[0035] The seat cushion S1 comprises 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 frame 11 from the left and right inner sides, and are integrally formed with the second support members 30. Since the seat cushion S1 has a substantially symmetrical structure, the following description will mainly describe the structure of one side in the left-right direction, and the structure of the other side will be omitted as appropriate.

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

[0037] The three resin plates (PP) are arranged with a gap between them in the front-to-back direction and are supported by three wires (W) that extend in the front-to-back direction.

[0038] The three wires W are made of metal and are spaced apart from each other in the left-right direction. Covering members 60 are placed at the front and rear ends of each of the three wires W. The covering members 60 are made of resin and are integrally formed with the wires W, covering and enclosing the substantially arc-shaped bent portions of the front and rear ends of the wires W. The covering members 60 have a substantially C-shaped cylindrical form with a slit formed in the left-right direction. The front and rear ends of each wire W are covered by the covering members 60. The front end of each wire W is locked to the front pipe 12B, and the rear end is locked to the rear frame 13.

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

[0040] In the following explanation, the resin plate PP positioned at the very front will also be referred to as the "front plate 21," the resin plate PP positioned in the center will also be referred to as the "center plate 22," and the resin plate PP positioned at the very back will also be referred to as the "rear plate 23."

[0041] The front plate 21 is formed in a flat shape and has holes H1 through which a fan duct (not shown) passes. The holes H1 are formed with a gap between them on the left and right sides. One hole H1 is positioned 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 frame 11 and are supported only by the wires W.

[0042] The front plate 21 is positioned at an angle to the horizontal plane such that its rear end is higher than its 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 shape and is arranged substantially parallel to the horizontal plane. The central plate 22 is located at the bottom of the three resin plates PP and has left and right ischial bone through-holes H2 formed at positions corresponding to the ischial bones of the seated person. In other words, the ischial bone through-holes H2 are provided in the lowest part of the surface of the first support member 20 that supports the seated person.

[0044] Each ischial tuberosity through-hole H2 is an elongated hole in the front-to-back direction and is spaced apart in the left-to-right direction. One ischial tuberosity through-hole H2 is positioned between the central wire W and the wires W on both sides. The area of ​​each ischial tuberosity through-hole H2 can be, for example, 20 to 36 cm². The size of the ischial tuberosity through-hole H2 in the front-to-back direction can be 70 to 90 mm, and the size in the left-to-right direction can be 40 to 60 mm. If the ischial tuberosity through-hole H2 is too small, it will not be able to adequately relieve the pressure from the ischial tuberosities, and if it is too large, the support capacity will decrease.

[0045] As shown in Figure 3(a), two notches 22A are formed at each of the left and right ends of the central plate 22, opening outwards in the left-right direction. The wire W is positioned to cross each notch 22A.

[0046] Three second engaging portions 22B are formed at each of the left and right ends of the central plate 22, with a notch 22A in between. As shown in Figure 4, each second engaging portion 22B protrudes downward from the lower surface of the central plate 22 and 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 their upper surfaces are substantially flush with the upper surface of the second portion 32 of the second support member 30, which will be described later.

[0047] Returning to Figure 3(a), six slits SL are formed on the edge of each ischial tuberosity through-hole H2. Each slit SL penetrates the central plate 22 in the vertical direction and opens at one end, connecting to the ischial tuberosity through-hole H2. Each slit SL extends in the front-to-back direction, with one on the front and one on the rear edge of the arc-shaped ischial tuberosity through-hole H2, and two on each of the left and right edges extending in the left-to-right direction.

[0048] In this embodiment, 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. By overlapping the front-rear positions of the slit SL and the second engagement portion 22B, a decrease in the support force of the first support member 20 can be suppressed. In this example, both the leading edge slit SL and the trailing edge slit SL overlap with 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 with 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 portions 34A and 34B in the front-rear direction. By aligning the front-rear positions of the slits SL and the connecting portions 34A and 34B, a decrease in the support force of the first support member 20 can be suppressed. In this example, all of the multiple slits SL extending in the left-right direction were located within the range of the connecting portions 34A and 34B in the front-rear direction, but the support force of the first support member 20 may also be adjusted by having only some of the slits SL located within the range of the connecting portions 34A and 34B in the front-rear direction.

[0050] As shown in Figure 3(b), the peripheral portion H21 of the ischial tuberosity through-hole H2 in which each slit SL is formed is inclined so as it moves towards the center of the ischial tuberosity through-hole H2.

[0051] As shown in Figure 3(a), the rear plate 23 is formed in a flat shape and is positioned at an angle to the horizontal plane such that its rear end is higher than its front end. The rear end of the rear plate 23 is positioned above the central plate 22. The rear plate 23 has one coccyx through-hole H3 formed at a position corresponding to the coccyx of the seated person. The coccyx through-hole H3 is located in the left-right center of the rear plate 23. The coccyx through-hole H3 is positioned behind each ischial through-hole H2, and its left-right center is positioned between each ischial through-hole H2 in the left-right direction. The coccyx through-hole H3 is a roughly triangular hole when viewed from above, with one corner facing forward.

[0052] The area of ​​the coccyx through-hole H3 can be, for example, 6 to 12 cm². The anterior-posterior size of the coccyx through-hole H3 can be 25 to 35 mm, and the lateral size can be 30 to 40 mm. If the coccyx through-hole H3 is too small, it cannot adequately release the pressure from the coccyx, and if it is too large, the support capacity will decrease.

[0053] Each of the left and right ends of the rear plate 23 has a notch 23A that opens outward in the left-right direction. The wire W is positioned to cross the notch 23A.

[0054] At each left and right end of the rear plate 23, two second engaging portions 23B are formed, positioned on either side of a notch 23A. Each second engaging portion 23B has the same structure as the second engaging portion 22B described above and engages with the wire W. Although the reference numerals are omitted, engaging portions with the same structure as the second engaging portions 22B and 23B are also formed at each left and right end of the front plate 21 and at the left and right centers of each resin plate PP.

[0055] The left and right second support members 30 are members that support the seated person together with the first support member 20, and are made of resin. The second support members 30 are separate from the first support member 20, and one is placed on each of the left and right sides of the first support member 20, more specifically the central plate 22 and the rear plate 23.

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

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

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

[0059] The three connecting parts 34A to 34C are the parts that are connected to the first support member 20 (central plate 22 or rear plate 23). The three connecting parts 34A to 34C are connected to the first support member 20 and support the first support member 20. The two front connecting parts 34A and 34B are examples of the first connecting parts and are located within the range of the ischial tuberosity 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 ischial tuberosity through-hole H2 in the front-rear direction. The two front connecting parts 34A and 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 ischial tuberosity through-hole H2. More specifically, the connecting portion 34C is located within the range of the coccyx through-hole H3 in the anterior-posterior direction. In other words, a part of the second support member 30 is located within the range of the coccyx through-hole H3 in the anterior-posterior direction. The rearmost connecting portion 34C is connected to the rear plate 23 via a wire W.

[0061] Each connecting section 34A to 34C is positioned within the respective notches 22A and 23A (see Figure 3) of each plate 22 and 23. Since the connection structure between connecting sections 34A to 34C and each plate 22 and 23 is substantially the same, the following explanation will focus on the structure of connecting section 34A as a representative example.

[0062] As shown in Figure 4, the connecting portion 34A engages with the wire W located within the notch 22A. The connecting portion 34A mainly comprises a first wall A11 extending downward from the second portion 32, a second wall A12 extending inward in the left-right direction from the lower end of the first wall A11, and a hook A13, which is an example of a first engaging portion, extending upward from the left-right inward end of the second wall A12. The hook A13 has a hook shape with its 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 approximately in the center of the first wall A11 in the vertical direction, extending toward the wire W that engages with the hook A13. The restricting portion A14 is the part 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] Furthermore, 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 surfaces 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 diagonally inward and downward from the upper end of the first wall A11 in the left-right direction, and then extends inward in the left-right direction so as to pass under the wire W that engages with the hook A13 and reach the hook A13. The number of guide ribs A15 is arbitrary, but for example, it is preferable to arrange multiple guide ribs A15 at intervals in the front-rear direction.

[0065] Next, we will describe how to attach the first support member 20 and the second support member 30 to the cushion frame F1. As shown in Figure 2, first, the second support member 30 is attached to each of the left and right side frames 11 by engagement or bolting. Then, the covering members 60, which are integrally formed on each end of the three wires W, are pushed onto the front pipe 12B and the rear frame 13 from above and fitted into place, thereby attaching them to the front pipe 12B and the rear frame 13.

[0066] Next, the wire W is pushed from above into the connecting portions 34A to 34C of the left and right second support members 30 to engage them. Finally, the second engaging portions 22B and 23B of each resin plate PP are pushed from above into the wire W to engage them. In this way, each support member 20 and 30 can be attached to the cushion frame F1.

[0067] As described above, this embodiment can achieve the following effects. By forming a perforation hole H2 for the ischial tuberosity in the central plate 22, the pressure applied to the area around the ischial tuberosity of the sitter can be released through the perforation hole H2, thereby reducing the pressure applied to the area around the ischial tuberosity of the sitter. The second support member 30 further reduces the pressure applied to the area around the ischial tuberosity by supporting both sides of the sitter's buttocks and thighs. In addition, since a part of the second support member 30 (the front connecting parts 34A, 34B) is located within the range of the perforation hole H2 in the front-rear direction, the area of ​​the central plate 22 around the perforation hole H2 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 a connecting portion 34C that connects to the rear plate 23 at a position behind the ischial bone through hole H2, the rear plate 23 can be well supported by the second support member 30.

[0069] By forming a slit SL on the edge of the ischial tuberosity through-hole H2, the area surrounding the ischial tuberosity through-hole H2 becomes more easily deformable by the slit SL, thus gradually reducing the pressure applied around the seated person's ischial tuberosities as it approaches the ischial tuberosities.

[0070] Since the rear plate 23 has a coccyx-penetrating hole H3, the pressure on the seated person's coccyx can be released through the coccyx-penetrating hole H3. In addition, since a part of the second support member 30 is located within the range of the coccyx-penetrating hole H3 in the front-rear direction, the portion of the rear plate 23 around the coccyx-penetrating hole H3 can be reinforced by the second support member 30.

[0071] Since the first support member 20 has second engaging portions 22B and 23B that engage with the wire W, the first support member 20 can be well supported by the wire W.

[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 way, when a load is applied to the first support member 20, the left and right ends of the first support member 20 rotate around the wire W, thereby increasing the amount of vertical movement of the first support member 20 and improving the seating comfort of the person sitting on it.

[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] Because the front panels 21, 121, the central panels 22, 122, and the rear panels 23, 123 are spaced far apart, interference between them can be suppressed even when a large load is applied when seated. Furthermore, compared to a case where the front panels 21, 121, the central panels 22, 122, and the rear panels 23, 123 are made from a single resin plate, the load of the seated person is supported by three resin plates, resulting in a more appropriate load distribution. Furthermore, the spacing between the front panels 21, 121, the central panels 22, 122, and the rear panels 23, 123 shall be such that the resin panels do not interfere with each other when a large occupant is seated, taking into consideration the occupant's build and weight.

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

[0076] In the above embodiment, the second engaging portion 22B protrudes from the lower surface of the central plate 22, but the present invention is not limited thereto. For example, as shown in Figure 5, the second engaging portion 22B may protrude from the upper surface of the central plate 22. Similarly, other engaging portions may also protrude from the upper surface of the resin plate.

[0077] Furthermore, the vehicle seat S may be configured as in the second embodiment shown below. In the second embodiment, components substantially the same as those in the previous embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0078] As shown in Figures 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 differ from those in the previous embodiment. In the second embodiment, the wire W has its front end engaged with the front pipe 12B and its rear end engaged with the rear frame 13.

[0079] The first support member 120 comprises 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 the shape of a rectangular plate.

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

[0081] The central plate 122 is bent based on the first fold line L1 and the second fold line L2. The first fold line L1 is a line running in the left-right direction and is positioned to pass through the left and right ischial tuberosity through-holes H2. More specifically, the first fold line L1 is positioned behind the center of the ischial tuberosity through-hole H2 in the front-to-back direction. Furthermore, the first fold line L1 is positioned to pass through the slits SL located in the left and right straight portions of the elongated ischial tuberosity through-hole H2.

[0082] The second fold line L2 is provided at both the left and right ends of the central plate 122. The right-side second fold line L2 has a portion that extends diagonally forward and to the right from the right end of the first fold line L1 and connects to the right end of the central plate 122, and a portion that extends backward along the front-to-back direction from the right end of the first fold line L1 and connects to the rear end of the central plate 122. The left-side second fold line L2 is configured to be approximately symmetrical to the right-side 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 with respect to the second surface SF2 with respect to the first polyline L1, and the third surfaces SF3 are inclined with respect to the first surface SF1 and the second surface SF2 with respect to the second polyline L2.

[0084] As shown in Figure 10(a), the first surface SF1 is an inclined surface that extends diagonally upward and forward from the front end (first bend line L1) of the second surface SF2, and is positioned to be approximately flush with the upper surface 121A of the front plate 121. The second surface SF2 extends approximately horizontally backward from the rear end of the first surface SF1.

[0085] As shown in Figures 6 and 7, the left and right third surfaces SF3 are positioned outward in the left-right direction relative to the left and right second polylines L2. The right third surface SF3 is an inclined surface extending diagonally upward to the right from the right second polyline L2. The left third surface SF3 is configured to be approximately symmetrical to the right third surface SF3.

[0086] The right edge of the upper surface of the central plate 122 is composed of the right edge of the first surface SF1 and the right edge of the third surface SF3. The left edge of the upper surface of the central plate 122 is composed of the left edge of the first surface SF1 and the left edge of the third surface SF3. The rear edge of the upper surface of the central plate 122 is composed of the rear edge of the second surface SF2 and the rear edges of the left and right third surfaces SF3.

[0087] The rear plate 123 has a base portion 123A that is positioned approximately horizontally, a vertical wall portion 123B that extends diagonally upward and backward from the rear end of the base portion 123A, and a plurality of ribs 123C that connect the base portion 123A and the vertical wall portion 123B. The plurality of ribs 123C are arranged with gaps between them in the left-right direction.

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

[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 and connecting to the rear support portion W1. The front portion W21 overlaps the front end of the coccyx through hole H3 when viewed from above. The rear portion W23 overlaps the rear end of the coccyx through hole H3 when viewed from above. By forming such a concave portion W2 on the wire W, the pressure applied to the coccyx of the occupant from the vehicle seat S can be reduced.

[0090] As shown in Figures 6 and 7, the base portion 123A is bent with respect to the left and right third bend lines L3. The left and right third bend lines L3 are lines that run in the front-to-back direction and are positioned on the extensions of the left and right second bend lines L2.

[0091] The upper surface of the base portion 123A has a fourth surface SF4 and two fifth surfaces SF5. Each of the two fifth surfaces SF5 is folded relative to the fourth surface SF4 with respect to the third fold line L3.

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

[0093] The left and right fifth faces SF5 are positioned outward in the left-right direction relative to the left and right third polylines L3. The right fifth face SF5 is an inclined surface extending diagonally upward to the right from the right third polyline L3. The left fifth face SF5 is constructed to be approximately symmetrical to the right fifth face SF5.

[0094] As shown in Figure 10(b), the vertical wall portion 123B has a recess B1 at its lower part that is recessed diagonally downward and backward. 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] As shown in Figure 6, the right-side second support member 130 has a first portion 131 positioned on the side frame 11, a second portion 132 extending inward and downward from the first portion 131 in the left-right direction, and three connecting portions 134A, 134B, and 134C formed at the left-right inward ends 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 of the side frame 11 from the left and right inward.

[0097] As shown in Figure 8(a), the second section 132 is folded based on the fourth fold line L4, the fifth fold line L5, and the sixth fold line L6. The fourth fold line L4 extends diagonally downward and forward from the rear of the upper end of the second section 132 to the front end of the second section 132. The fifth fold line L5 extends approximately along the front-to-back direction, located inward and below the fourth fold line L4 in the left-to-right direction. The sixth fold line L6 extends approximately along the front-to-back direction, located inward and below the fifth fold line L5 in the left-to-right direction.

[0098] The inner surface of the second part 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 polyline L4. The eighth surface SF8 is inclined with respect to the seventh surface SF7 with respect to the fifth polyline L5. The ninth surface SF9 is inclined with respect to the eighth surface SF8 with respect to the sixth polyline L6.

[0099] The sixth surface SF6 is an inclined surface that slopes inward and downward from the left-right inner end of the first part 131, and its angle with respect to the horizontal plane is the first angle θ1 (see Figure 8(c)).

[0100] The seventh face, SF7, is an inclined surface that slopes inward and downward from the lower end of the sixth face, SF6, and its angle with respect to the horizontal plane is a second angle θ2, which is larger than the first angle θ1 (see Figure 8(c)).

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

[0102] Face 9 SF9 extends downward from the lower end of face 8 SF8. Face 9 SF9 has three connecting parts 134A, 134B, and 134C and two protrusions P1 and P2. In the following description, the three connecting parts 134A, 134B, and 134C will also be referred to as the first connecting part 134A, the second connecting part 134B, and the third connecting part 134C, respectively, and the two protrusions P1 and P2 will also be referred to as the first protrusion P1 and the second protrusion P2, respectively.

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

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

[0105] The first protrusion P1 has a greater length in the front-to-back direction than the second protrusion P2. More specifically, the length of the first protrusion P1 in the front-to-back direction 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 positioned 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 left-side second support member 130 may be configured to have a slightly different shape from the right-side second support member 130, or it may be configured to be symmetrical.

[0108] As shown in Figure 9, the component AS, which is formed by integrating the second support member 130 and the cover member 140, has an upper wall AS1 positioned on the side frame 11, a rear wall AS2 positioned behind the side frame 11, a first fixing part 71, a second fixing part 72, and a third fixing part 73. The upper wall AS1 is the part that includes the aforementioned first part 131, and its rear part is inclined diagonally upward and rearward. The rear wall AS2 extends in the vertical direction and has a curved shape that is convex to the rear.

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

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

[0111] The third fixing portion 73 is positioned on the upper part of the rear wall AS2. The third fixing portion 73 extends forward from the left-right outer end of the rear wall AS2, and its tip engages with the side surface of the side frame 11.

[0112] The third fixing part 73 is positioned in approximately the same location as the second fixing part 72 in the vertical direction. The second fixing part 72 and the third fixing part 73 are positioned above the first fixing part 71. Furthermore, the third fixing part 73 is positioned behind the second fixing part 72, and the second fixing part 72 is positioned behind the first fixing part 71.

[0113] As shown in Figure 7, the first fixing portion 71 and the first connecting portion 134A are arranged so that their positions overlap in the front-rear direction. Specifically, the front part of the first fixing portion 71 is positioned within the range of the first connecting portion 134A in the front-rear direction. This makes it possible to increase the mounting rigidity between the first fixing portion 71 and the side frame 11, and the mounting rigidity between the first connecting portion 134A and the wire W.

[0114] Furthermore, the first fixing portion 71 and the ischial tuberosity through-hole H2 are positioned so that their positions overlap in the front-to-back direction. Specifically, the entire first fixing portion 71 is positioned within the range of the ischial tuberosity through-hole H2 in the front-to-back direction. This increases the mounting 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-rear direction. However, the present invention is not limited thereto. At least a portion of the fixing portion is positioned within the range of the connecting portion in the front-rear direction. For example, the entire fixing portion may be positioned within the range of the connecting portion in the front-rear direction.

[0116] Furthermore, in the second embodiment, the entire first fixing portion 71 is positioned within the range of the ischial tuberosity through-hole H2 in the front-rear direction. However, the present invention is not limited thereto, and it is sufficient that at least a part of the fixing portion is positioned within the range of the ischial tuberosity through-hole in the front-rear direction.

[0117] In the embodiments described above, the number of wires W was set to three, but the present invention is not limited to this, and may be two, four or more, for example. For example, if two wires are used, the two wires may be placed at the left and right ends of the first support member.

[0118] As shown in Figure 11, if there are four wires W, two of the four wires W may be placed at the left and right ends of the first support member 120, and the remaining two wires W may be placed so as to cross the two ischial bone through-holes H2 from front to back. In this case, the parts of the two middle wires W corresponding to the ischial bone through-holes H2 may be made into concave sections W2 as shown in Figure 8(b). This reduces the pressure applied to the seated person's ischial bones from the vehicle seat S.

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

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

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

[0122] Furthermore, the third support member 52 is provided in relation to the coccyx 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 block the coccyx through-hole H3.

[0123] According to this, the third support members 51 and 52, which are more flexible than the first support member 120 made of resin, can adequately support the seated person's ischial tuberosities and coccyx, and the pressure applied around the seated person's ischial tuberosities and coccyx can be released from the third support members 51 and 52.

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

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

[0126] In the above embodiment, the second support member 30 was formed in the shape of a plate, but the present invention is not limited thereto, and for example, the second support member may be in the shape of a rod, such as a wire.

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

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

[0129] Furthermore, the shape of the engaging portion is not limited to a hook shape; it may also be a U-shaped groove or a claw with a barb at the tip, among other shapes.

[0130] In the above embodiment, an inclined surface was provided around the ischial tuberosity through-hole H2, but the inclined surface is not required. A slit SL is not required on the edge of the ischial tuberosity through-hole H2. Furthermore, similar to the ischial tuberosity through-hole H2, a slit may be provided on the edge of the coccyx through-hole H3, or an inclined surface may be provided around the coccyx through-hole H3.

[0131] In the above embodiment, the position of the slit SL extending in the left-right direction in the front-rear direction overlapped with the connecting portions 34A and 34B. However, the position of the slit SL extending in the left-right direction (or at least one of the multiple slits) in the front-rear direction may be configured to overlap with the second engaging portion 22B.

[0132] In the above embodiment, the position of the slit SL extending in the front-rear direction in the front-rear direction coincided with the second engaging portion 22B. However, the position of the slit SL extending in the front-rear direction (at least one of the multiple slits) in the front-rear direction may coincide with the connecting portions 34A and 34B.

[0133] In the above embodiment, through-holes were used as examples for the ischial tuberosity and coccyx regions, but recesses can also be used, and an elastic member that is more flexible than the material constituting the resin plate can be provided in the portion corresponding to the through-hole.

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

[0135] The elements described in the above embodiments and modifications may be implemented in any combination.

Claims

1. The left and right side frames are spaced apart, A front frame and a rear frame that connect the left and right side frames, A first support member having an engaging portion that engages with the rear frame and supports the seated person, The system comprises left and right second support members, which are positioned on both the left and right sides of the first support member, with their left and right outer ends positioned further outward in the left and right directions than the engagement portion, and which support the seated person together with the first support member. The first support member is a plate-shaped member, and has a recess in the center of its rear end in the left-right direction, corresponding to the tailbone of the person sitting. The recess has a shape that gradually narrows towards the front. A vehicle seat characterized in that 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 that are spaced apart in the left-right direction and correspond to the ischial tuberosities of a seated person, The vehicle seat according to claim 1, characterized in that the center of the recess in the left-right direction is located between a pair of through holes in the left-right direction.

3. The first support member has a wire stretched between the front frame and the rear frame, The vehicle seat according to claim 1 or 2, characterized in that the recess overlaps with the wire.

4. The vehicle seat according to 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 the fan duct passes, The vehicle seat according to claim 2, characterized in that the holes are aligned with the through holes in the front-to-back direction.

6. The holes are provided in pairs with an interval between them in the left-right direction. The vehicle seat according to claim 5, characterized in that the center of the recess in the left-right direction is located between the pair of 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, characterized in that the wire overlaps with the through hole.

8. The wires are provided in pairs with space between them in the left-right direction, The seat for a vehicle according to claim 7, characterized in that the recess is located between a pair of wires in the left-right direction.

9. The vehicle seat according to claim 2, characterized in that the through hole is larger than the recess.

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

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