Seat cushions and vehicle seats

Abstract

To provide a seat cushion for preventing deterioration of seating comfort of a seated occupant, and to provide a vehicle seat.SOLUTION: A seat cushion of the disclosure includes: a cushion pad capable of supporting the hip or the thigh of a seated occupant; a cushion frame supporting the cushion pad; a pad support part which is provided below the cushion pad and may elastically support the cushion pad; a supporting platform attached to the pad support part; a flap which is disposed above the supporting platform, includes a hinge part provided at its end and rotatably supported by a hinge receiving part which is provided at a lower surface side of the supporting platform, and may push a rear portion of the cushion pad upward; and a flap lifting device which may lift the flap upward relative to the supporting platform.SELECTED DRAWING: Figure 4

Description

【Technical Field】 【0001】 The present disclosure relates to a seat cushion and a vehicle seat. 【Background Art】 【0002】 In Patent Document 1 below, in a vehicle seat mounted on an automobile or the like, when the vehicle is parked and the seated occupant takes a rest or sleeps and the seat back is greatly reclined backward, a structure for eliminating a step generated between the seat cushion and the seat back is described. More specifically, a vehicle seat is described that can eliminate a step generated between the seat back and the seat cushion by pushing up the rear of the seat cushion upward when the seat back is reclined to a substantially horizontal position. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 U.S. Patent Publication No. 2019 / 0143852 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the one of Patent Document 1 above, the hinge portion of the second suspension that pushes up the cushion pad of the seat cushion bulges upward more than the mat portion that abuts on the cushion pad. Therefore, this hinge portion always presses the cushion pad upward. In such a case, especially when the cushion pad is relatively thin, the hinge portion may press the buttocks of the seated occupant through the cushion pad, giving the seated occupant a feeling as if stepping on a foreign object (a foreign object feeling). Such a foreign object feeling felt during sitting causes a deterioration in the sitting comfort of the seated occupant. 【0005】 In consideration of the above problems, an object of the present disclosure is to provide a seat cushion and a vehicle seat for preventing a deterioration in the sitting comfort of a seated occupant. [Means for solving the problem] 【0006】 To achieve the above objective, a seat cushion according to a first aspect of the present disclosure includes: a cushion pad capable of supporting the buttocks and thighs of a seated occupant; a cushion frame supporting the cushion pad; a pad support portion provided below the cushion pad and capable of elastically supporting the cushion pad; a support base attached to the pad support portion; a flap disposed above the support base and having a hinge portion at its end rotatably supported by a hinge receiver provided on the lower surface of the support base, capable of pushing the rear portion of the cushion pad upward; and a flap lifting device capable of lifting the flap upward relative to the support base. 【0007】 In this type of seat cushion, the hinge portion of the flap is positioned on the underside of the support base, preventing the hinge portion from pressing against the underside of the cushion pad. Therefore, even if the cushion pad is relatively thin, for example, the hinge portion will not press against the seated occupant's buttocks through the cushion pad, thus preventing the seated occupant from feeling any foreign object when seated. 【0008】 A seat cushion according to a second aspect of the present disclosure, in which the hinge portion is rotatably supported by the hinge receiving portion from above the support base via an insertion hole provided in the support base. 【0009】 In such a seat cushion, the overall length of the flap in the seat width direction can be made shorter than the support base, allowing the flap to be made more compact. 【0010】 A seat cushion according to a third aspect of the present disclosure, wherein the seat cushion according to the second aspect of the present disclosure includes a mounting area formed adjacent to the insertion hole and a hinge receiving block having the hinge receiving portion formed and attachable to the mounting area. 【0011】 In this type of seat cushion, the ability to attach the hinge receiving block to the support base improves the ease of assembling the flap to the support base. 【0012】 A seat cushion according to a fourth aspect of the present disclosure is a seat cushion according to a third aspect of the present disclosure, wherein the hinge portion is composed of a rod-shaped rotating shaft, and the hinge receiving block includes a projection that protrudes downward when mounted in the mounting area, and a bearing hole formed in the projection into which the rotating shaft can be rotatably inserted. 【0013】 In this type of seat cushion, by making a part of the hinge receiving section a bearing hole into which a rotating shaft can be inserted, the flap can be firmly supported after assembly, making it less likely for the flap to come off. 【0014】 A seat cushion according to a fifth aspect of the present disclosure is a seat cushion according to any of the first to fourth aspects of the present disclosure, wherein the flap lifting device includes an operating unit that can adjust the amount the flap is lifted. 【0015】 In such seat cushions, the amount the cushion pad is pushed up during driving can be freely changed based on the operation of the seated occupant, and the height of the cushion pad can be easily adjusted to the optimal height for driving. 【0016】 A vehicle seat according to a sixth aspect of the present disclosure includes a seat cushion according to any of the first to fifth aspects, a back pad capable of supporting the back of the seated occupant, and a seat back that supports the back pad and is tiltable in the front-rear direction relative to the seat cushion. 【0017】 In such a vehicle seat, since the hinge portion of the flap is disposed on the lower surface side of the support base, the hinge portion does not press the lower surface of the cushion pad. Therefore, even when the cushion pad is relatively thin, for example, the hinge portion does not press the buttocks of the seated occupant through the cushion pad, and the seated occupant is not given a foreign body sensation when sitting. 【Effect of the Invention】 【0018】 According to the seat cushion and the vehicle seat of the present disclosure, even when the cushion pad is relatively thin, it is possible to prevent a decrease in the sitting comfort of the seated occupant. 【Brief Description of the Drawings】 【0019】 [Figure 1] It is an external perspective view showing an example of a vehicle seat including a seat cushion according to an embodiment of the present disclosure. [Figure 2] It is a perspective view showing an example of the frame structure of the vehicle seat shown in FIG. 1. [Figure 3] It is an enlarged plan view of the main part of the seat cushion of the vehicle seat shown in FIG. 2 as viewed from the upper surface side. [Figure 4] It is an enlarged perspective view showing only a part related to the seat cushion pushing-up mechanism of the vehicle seat shown in FIG. 2 in an enlarged manner. [Figure 5] It is an exploded perspective view showing a part of FIG. 4 in an exploded manner. [Figure 6] It shows an example of a hinge receiving block. FIG. 6(A) is an enlarged front view of part B of FIG. 5 as viewed from the front, and FIG. 6(B) is an exploded view showing a state in which the flap and the hinge receiving block shown in FIG. 6(A) are separated. [Figure 7] It is an enlarged perspective view showing a state where the flap shown in FIG. 4 is pushed upward. [Figure 8] It is a cross-sectional view taken along line A-A of FIG. 3. [Figure 9] It is an enlarged perspective view showing the main part of the seat cushion according to a modification example of the present disclosure in an enlarged manner. [Figure 10]It is an enlarged perspective view of the main part seen from the back side of part C in FIG. 9. 【Mode for Carrying Out the Invention】 【0020】 Hereinafter, embodiments for implementing the present disclosure will be described with reference to the drawings. In the following, the scope necessary for the description for achieving the object of the present disclosure is schematically shown, and mainly the scope necessary for the description of the corresponding part of the present disclosure will be described, and the parts where the description is omitted are assumed to be based on known techniques. Further, when a plurality of members that are the same or equivalent to each other are included in the drawings, in order to make the drawings easy to view, some of them may be labeled with reference numerals. 【0021】 FIG. 1 is an external perspective view showing an example of a vehicle seat including a seat cushion according to an embodiment of the present disclosure. Further, FIG. 2 is a perspective view showing an example of the frame structure of the vehicle seat shown in FIG. 1. As shown in FIGS. 1 and 2, the seat cushion 12 according to the present embodiment may constitute a part of the vehicle seat 10 according to the present embodiment. This vehicle seat 10 can be applied to a seat attached to the driver's seat of a vehicle, for example, an automobile, and includes a seat cushion 12 that supports the buttocks and thighs of the seated occupant, and a seat back 14 that supports the back of the seated occupant. In FIG. 1, the arrow FR indicates the front side of the seat, the arrow UP indicates the upper side of the seat, and the arrow W indicates the width direction of the seat. Here, the right hand direction when facing the front side of the seat is defined as the "right side of the seat", and the left hand direction is defined as the "left side of the seat". Further, in the present embodiment, the front side, upper side, and width direction of the vehicle seat 10 are substantially the same as the front side, upper side, and width direction of the vehicle. 【0022】 As shown in FIGS. 1 and 2, the seat cushion 12 according to the present embodiment mainly includes a cushion pad 20 that can support the buttocks and thighs of the seated occupant, and a cushion frame 22 that supports the cushion pad 20. 【0023】 The cushion pad 20 is mainly composed of a foaming agent such as urethane, and its surface may be covered with a surface material such as fabric or leather. The cushion pad 20 can consist of a pad body 30 provided in the center of the seat width direction, and a pair of left and right side pads 32, 32 provided on both ends of the pad body 30 in the seat width direction. The pad body 30 and the side pads 32, 32 may be formed as a single unit or separately, and a first slit 34 may be provided between them. In addition, a second slit 36 ​​may be provided at any position on each of the pad body 30 and the side pads 32, 32. Figure 1 illustrates a case in which a second slit 36 ​​extending in the width direction is provided in the center of the front-to-rear direction of the pad body 30. 【0024】 As shown in Figure 2, the cushion frame 22 may include a pair of cushion side frames 40, 40 provided at both ends in the seat width direction, a front frame 42 that constitutes the front part of the cushion frame 22, and a rear frame 44 that constitutes the rear part of the cushion frame 22. 【0025】 The pair of cushion side frames 40, 40 can be made of long members, for example, steel plates. Each cushion side frame 40, 40 can also be formed by connecting a plurality of short frame members in the front-rear direction. In this case, each connected frame member can be made rotatable relative to the others. Furthermore, each of these cushion side frames 40, 40 may be slidably connected to a sliding device 16 fixed to the vehicle. 【0026】 The front frame 42 may be a metal member made of sheet metal, for example. Both ends of the front frame 42 in the seat width direction may be connected to the front ends of the pair of cushion side frames 40, 40. The rear frame 44 may be made of metal pipe, for example. Both ends of the rear frame 44 in the seat width direction may be connected to the rear ends of the pair of cushion side frames 40, 40. 【0027】 In the area enclosed by each of the frames described above, a seat cushion spring 46 may be provided as an example of a pad support. This seat cushion spring 46 is positioned below the cushion pad 20, thereby elastically supporting the cushion pad 20. In addition, one or more (three in Figure 2) seat cushion springs 46 may be provided, for example, stretched between the front frame 42 and the rear frame 44. Zigzag springs, formed wire springs, or slat springs can be used for the seat cushion springs 46, and their surfaces may be coated with resin. 【0028】 The seat back 14 included in the vehicle seat 10 according to this embodiment may include a back pad 50 capable of supporting the back of a seated occupant, and a back frame 52 that supports the back pad 50 and can tilt in the front-rear direction relative to the seat cushion 12. The back frame 52 may extend from the rear end of the seat cushion 12 and be supported so as to be able to tilt in the front-rear direction with the end on the cushion frame 22 side as the pivot point. 【0029】 The back pad 50, like the cushion pad 20, is mainly composed of a foaming agent such as urethane, and its surface may be covered with a surface material such as cloth or leather. The back pad 50 may include a back-side pad body 60 provided in the center of the seat width direction, and a pair of left and right back-side pads 62, 62 provided on both ends of the back-side pad body 60 in the seat width direction. 【0030】 The back frame 52 may include a pair of back side frames 70, 70 provided at both ends in the width direction of the seat, an upper pipe 72 provided on the upper side of the seat in Figures 1 and 2, and a lower pipe 74 provided on the lower side of the seat. 【0031】 The pair of backside frames 70, 70 can be made of steel plates with the sheet width direction as the plate thickness direction. A connecting frame 76 extending in the sheet width direction and connecting the two backside frames 70, 70 may be provided at the rear of the sheet on the lower side of the pair of backside frames 70, 70. 【0032】 The upper pipe 72 can be made of a roughly U-shaped metal pipe with both ends connected to the upper ends of a pair of backside frames 70, 70. A headrest frame 78 that supports the headrest 54 in a height-adjustable manner may be connected to the portion of the upper pipe 72 that extends in the seat width direction and is located above the seat. 【0033】 The lower pipe 74 can be made of a metal pipe with both ends connected to the lower ends of a pair of backside frames 70, 70. A reclining device 18 may be attached to the position where the ends of the lower pipe 74 are connected to the backside frame 70. When this reclining device 18 is operated, the seat back 14 can be tilted in the front-to-back direction. The lower pipe 74 can also function as a pivot point when the seat back 14 tilts. Part of the reclining device 18 may be connected to a suitable location on the cushion frame 22, thereby connecting the cushion frame 22 and the back frame 52. 【0034】 The reclining device 18 and sliding device 16 described above can be operated manually or electrically. In this regard, the vehicle seat 10 according to this embodiment may include an ECU (Electronic Control Unit) 90 for operating the electrically operated device included in the vehicle seat 10. The ECU 90 can consist of a well-known computer in which a processor, volatile and non-volatile memory, and various interfaces (e.g., input / output interfaces and communication interfaces) are electrically connected. 【0035】 The ECU 90 may be connected to an operating unit 92 for issuing operating instructions to various actuators included in the vehicle seat 10. The operating unit 92 in this embodiment may be capable of adjusting the reclining device 18 and the sliding device 16, and may also adjust the amount the flap 84 of the seat cushion lifting mechanism 80, which will be described later. In this embodiment, the operating unit 92 is exemplified as one that electrically operates various actuators included in the vehicle seat 10 by transmitting a predetermined signal to the ECU 90, such as a push-button switch, but instead, one that mechanically operates the various actuators included in the vehicle seat 10 can also be used. 【0036】 Figure 3 is an enlarged plan view of the main part of the seat cushion of the vehicle seat shown in Figure 2, viewed from above. Figure 4 is an enlarged perspective view showing only the part related to the seat cushion lifting mechanism of the vehicle seat shown in Figure 2. The seat cushion 12 and vehicle seat 10, which include the series of configurations described above, further include a seat cushion lifting mechanism 80 that can push the rear portion of the cushion pad 20 upward. As shown in Figures 2 to 4, this seat cushion lifting mechanism 80 includes a support base 82 attached to the seat cushion spring 46, a flap 84 that pushes the rear portion of the cushion pad 20 upward, and a flap lifting device 86 that lifts the flap 84 upward relative to the support base 82. 【0037】 As shown in Figures 3 and 4, the support base 82 is positioned approximately in the center of the rear of the seat of the cushion frame 22 and can be composed of a plate-shaped member attached to the seat cushion spring 46 fixed to the cushion frame 22. In this way, by attaching the support base 82 to the seat cushion spring 46, the seat cushion lifting mechanism 80 can contact and support the lower surface of the cushion pad 20 together with the seat cushion spring 46. 【0038】 It is preferable that through holes 82A be provided near the left and right ends of the front of the seat of the support base 82. The ends of the flaps 84 can be inserted into these through holes 82A. In addition, a hinge receiving portion is provided on the underside (back side) of the support base 82 adjacent to these through holes 82A, but the detailed structure will be described later. The through holes 82A are provided so that the ends of the flaps 84 can be positioned on the back side of the support base 82, but the structure is not limited to this as long as a similar function can be achieved. For example, instead of these through holes 82A, a notch may be provided on the edge of the support base 82, and the ends of the flaps 84 may be positioned on the underside of the support base 82 through the notch. 【0039】 The flap 84 may include a rod-shaped frame 84A bent into a roughly U-shape, a molded mat 84B attached to the rod-shaped frame 84A so as to close off an area surrounded on three sides by the rod-shaped frame 84A, and rod-shaped rotating shafts 84C provided at both ends of the rod-shaped frame 84A. Each rotating shaft 84C may be arranged on the same axis and extend a predetermined length in a direction away from each other along the sheet width direction. 【0040】 The flap lifting device 86 may be a device for lifting the flap 84, which is supported by the support base 82, upward, or more specifically, for rotating the flap 84 around the rotation axis 84C. Various types of devices can be used for this flap lifting device 86. For example, a device can be used in which an airbag is placed between the support base 82 and the flap 84, and air or other gas is supplied to or discharged from the airbag via a pump or the like to inflate or deflate the airbag. Alternatively, a wire can be fixed to an appropriate place on the flap 84, for example, a part of the rod-shaped frame 84A, and this wire can be wound up by an electric motor or the like (not shown). In this embodiment, an example is given in which a device for inflating or deflating an airbag is placed between the support base 82 and the flap 84. 【0041】 When the flap lifting device 86 is operated and the flap 84 rotates around the rotation axis 84C, the rear portion of the cushion pad 20 positioned above the flap 84 is pushed upward. The flap lifting device 86 should be operable based on the operation of the control unit 92 so that the seated occupant can freely adjust the amount the cushion pad 20 is pushed up. This control unit 92 can be configured using a well-known user interface such as input / output switches or a touch panel. 【0042】 Figure 5 is an exploded perspective view showing a portion of Figure 4. Figure 6 shows an example of a hinge support block, where Figure 6(A) is an enlarged front view of part B of Figure 5 seen from the front, and Figure 6(B) is an exploded view showing the flap and hinge support block separated from those shown in Figure 6(A). The support base 82 according to this embodiment may include a hinge support block 100 to support the rotation axis 84C as the hinge portion of the flap 84, as shown in Figures 5 and 6. 【0043】 In addition, the support base 82 may be provided with a mounting area 82B adjacent to the insertion hole 82A, on which the hinge receiving block 100 can be attached. The mounting area 82B can be formed, for example, by a hole that penetrates the support base 82 vertically, similar to the insertion hole 82A. In addition, at least a portion of the outer edge of this mounting area 82B may be provided with a stepped portion 82C (see Figure 8, which will be described later, as appropriate) on which the flange portion 102 of the hinge receiving block 100, which will be described later, is placed. In this embodiment, the mounting area 82B is exemplified as being provided so as to be connected to the outside of the insertion hole 82A in the sheet width direction, as shown in Figure 5, but its position can be changed as appropriate as long as it is adjacent to the insertion hole 82A. 【0044】 As shown in Figures 5 and 6, the hinge receiving block 100 mainly includes a flange portion 102 that is substantially rectangular in plan view, a projection 104 that protrudes downward from the approximate center of the lower surface of the flange portion 102, and a support claw 106 provided adjacent to the projection 104. When the flange portion 102 is attached to the mounting area 82B, a part of its outer edge may rest on the stepped portion 82C, and when the flange portion 102 is placed on the stepped portion 82C, the support claw 106 engages with the edge of the mounting area 82B, allowing the hinge receiving block 100 to be attached to the support base 82. 【0045】 The projection 104 is formed to protrude from the lower surface of the flange portion 102, so that when the hinge receiving block 100 is attached to the support base 82, it may protrude below the support base 82. Near the downwardly protruding tip of this projection 104, a bearing hole 108 extending along the sheet width direction may be formed. In this embodiment, the projection 104 and the bearing hole 108 described above mainly function as a hinge receiving portion that receives the hinge portion of the flap 84. The bearing hole 108 may be a through hole or a bottomed hole. By configuring the hinge receiving portion with a bearing hole 108 in this way, the rotating shaft 84C, which acts as the hinge portion, is less likely to detach from the bearing hole 108 even when the flap 84 is in operation. 【0046】 The flap 84 can be assembled to the support base 82 by following the procedure below. First, the hinge support block 100 is assembled to the flap 84 by inserting the two rotation shafts 84C of the flap 84 into the bearing holes 108 of the two hinge support blocks 100. When assembling, it is preferable to move the hinge support block 100 along the arrow A1 shown in Figure 6(B) and insert the rotation shafts 84C of the flap 84 from the end closest to the insertion hole 82A of the bearing hole 108 of each hinge support block 100. 【0047】 Next, the flap 84, to which the hinge receiving block 100 is assembled, is moved along arrow A2 shown in Figure 5, and the hinge receiving block 100 is inserted into the mounting area 82B. When the flange portion 102 of the hinge receiving block 100 is placed on the stepped portion 82C of the mounting area 82B, the support claws 106 support the edge of the mounting area 82B and are fixed to the support base 82. As a result, the flap 84 can be rotatably mounted on the support base 82. 【0048】 Figure 7 is an enlarged perspective view showing the flap shown in Figure 4 pushed upward. The flap 84 assembled in the procedure described above can be rotated upward around the rotation axis 84C by operating the flap lifting device 86, as shown in Figure 7. When the flap 84 rotates and is lifted upward, it pushes the rear portion of the cushion pad 20 upward. This allows the seated occupant to adjust the height of the cushion pad 20 according to the usage and their own body shape. 【0049】 Figure 8 is a cross-sectional view taken along line AA in Figure 3. With the seat cushion lifting mechanism 80 configured as described above, as shown in Figure 8, the rotating shaft 84C and the like, which serve as the hinge, are positioned on the lower surface side of the support base 82, so that the hinge does not press against the cushion pad 20. In other words, the lower surface of the cushion pad 20 in this embodiment is elastically supported by the seat cushion spring 46 and the like, while being spaced apart from both the rotating shaft 84C, which serves as the hinge, and the projection 104 and bearing hole 108, which serve as the hinge receiving part. Therefore, unevenness on the lower surface side of the cushion pad 20 can be suppressed, and even if the thickness of the cushion pad 20 is thin, it will not give the seated occupant a feeling of foreign matter. 【0050】 In the seat cushion 12 and vehicle seat 10 according to the above-described embodiment, a hinge receiving block 100 was used as an example when assembling the flap 84 to the support base 82. However, assembly can also be performed without using the hinge receiving block 100. Therefore, the structure of a seat cushion lifting mechanism 110 without a hinge receiving block 100 will be described below as a modified example of the above-described embodiment. 【0051】 Figure 9 is an enlarged perspective view showing an enlarged view of the main part of a modified seat cushion according to the present disclosure. Figure 10 is an enlarged perspective view of part C in Figure 9, viewed from the back side. The seat cushion lifting mechanism 110 according to this modified example may include a support base 112 attached to the seat cushion spring 46 and a flap 114 that pushes the rear portion of the cushion pad 20 upward, as shown in Figures 9 and 10. Although not shown in Figures 9 and 10, the seat cushion lifting mechanism 110 may further include a device similar to the flap lifting device 86 described in the above-described embodiment. 【0052】 As shown in Figure 9, the support base 112 is positioned approximately in the center of the rear of the seat of the cushion frame 22 and can be composed of a plate-shaped member attached to the seat cushion spring 46 fixed to the cushion frame 22. It is preferable that through holes 112A be provided near the left and right ends of the front of the seat of the support base 112. These through holes 112A are preferably formed to be longer in the seat width direction than the through holes 82A in the above-described embodiment in order to allow insertion of the ends of the flap 114. In addition, a hook 112B, as another example of a hinge receiving portion, may be provided on the lower (back) side of the support base 82 adjacent to these insertion holes 112A, as shown in Figure 10. 【0053】 The flap 114 may have the same configuration as the flap 84 in the embodiment described above. That is, the flap 114 may include a rod-shaped frame 114A bent into a substantially U-shape, a molded mat 114B attached to the rod-shaped frame 114A so as to close off an area surrounded on three sides by the rod-shaped frame 114A, and rod-shaped rotating shafts 114C provided at both ends of the rod-shaped frame 114A. The rotating shafts 114C may extend for a predetermined length along the sheet width direction, moving away from each other. 【0054】 In the seat cushion lifting mechanism 110 including the above configuration, the flap 114 can be assembled to the support base 112 by the following procedure. First, one rotating shaft 114C provided at one end of the rod-shaped frame 114A is inserted into one of the insertion holes 112A, and then the other rotating shaft 114C is inserted into the other insertion hole 112A while bending a part of the rod-shaped frame 114A. Next, the two rotating shafts 114C are moved in the front-back direction and the rotating shafts 114C are inserted into the opening of the hook 112B and rotatably hooked in place. Then, the molded mat 114B is attached to the rod-shaped frame 114A to prevent it from accidentally falling off the support base 112. 【0055】 In the seat cushion lifting mechanism 110, which includes the configuration described above, the rotation axis 114C of the flap 114 is rotatably supported by a hook 112B located on the underside of the support base 112. As a result, the hinge portion does not press against the cushion pad 20, and the seated occupant does not feel any foreign body sensation. 【0056】 As explained above, with the seat cushion and vehicle seat of this disclosure, the hinge portions of the flaps 84 and 114 are arranged on the lower side of the support bases 82 and 112, so that the hinge portions do not come into contact with the cushion pad 20. Therefore, regardless of the thickness of the cushion pad, it is possible to prevent the hinge portions from pressing against the cushion pad and pressing against the buttocks of the seated occupant, thereby preventing a decrease in the seating comfort of the seated occupant. 【0057】 This disclosure is not limited to the embodiments described above, and can be implemented with various modifications without departing from the spirit of this disclosure. All such modifications are included in the technical concept of this disclosure. [Explanation of symbols] 【0058】 10 Vehicle seats 12 seat cushions 14 Seatback 20 cushion pads 22 Cushion Frame 46. ​​Seat cushion spring (an example of a pad support part) 80, 110 Seat cushion lifting mechanism 82, 112 Support stand 82A, 112A Through hole 82B Mounting area 84, 114 flaps 84A, 114A rod-shaped frame 84B, 114B molded mat 84C, 114C Rotating axis (example of hinge part) 86 Flap lifting device 92 Operation section 100 Hinge receiving block 104 Projection (an example of a hinge receiving part) 108 Bearing hole (an example of a hinge mounting area) 112B Hook (another example of a hinge receiver)

Claims

[Claim 1] A cushion pad capable of supporting the buttocks and thighs of a seated occupant, A cushion frame that supports the aforementioned cushion pad, A pad support portion is provided below the cushion pad and is capable of elastically supporting the cushion pad, A support base attached to the aforementioned pad support section, A flap is provided above the support base, and a hinge portion at its end is rotatably supported by a hinge receiver provided on the lower surface of the support base, which is capable of pushing the rear portion of the cushion pad upward. The system includes a flap lifting device that can lift the flap upward relative to the support base, The hinge portion is rotatably supported by the hinge receiving portion from above the support base via an insertion hole provided in the support base. Seat cushion. [Claim 2] The support base comprises a mounting area formed adjacent to the insertion hole, and a hinge receiving block having the hinge receiving portion and being attachable to the mounting area. The seat cushion according to claim 1. [Claim 3] The aforementioned hinge portion is composed of a rod-shaped rotating shaft, The hinge receiving block comprises a projection that protrudes downward when mounted in the mounting area, and a bearing hole formed in the projection into which the rotating shaft can be rotatably inserted. The seat cushion according to claim 2. [Claim 4] The flap lifting device includes an operating section that can adjust the amount the flap is lifted. The seat cushion according to claim 1. [Claim 5] A seat cushion according to any one of claims 1 to 4, The seatback includes a back pad capable of supporting the back of the seated occupant, and a back frame that supports the back pad and can be tilted in the front-rear direction relative to the seat cushion. Vehicle seats.

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