Vehicular seat

Abstract

To provide a vehicular seat that has a tip-up mechanism which is improved in degree of freedom for arranging the seat.SOLUTION: A vehicular seat S comprises a seat cushion 1 having a cushion main body part 1h, a seat back 2, and a tip-up mechanism CM that tips up the cushion main body part 1h. The cushion main body part 1h is turnably mounted on the seat back 2, and can be freely displaced between a normal state where an occupant can be seated and a standing state where the tip-up mechanism CM stands the cushion main body part 1h in parallel to the seat back 2. The cushion main body part 1h is configured to lock a position of the cushion main body part 1h in the standing state. The seat cushion 1 comprises a lifting mechanism LM that lifts up and down the cushion main body part 1h and the seat back 2, in a vertical direction.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat having a flip-up seat cushion. [Background technology]

[0002] BACKGROUND ART As disclosed in Patent Document 1, a vehicle seat is known that includes a tip-up mechanism that can flip up a seat cushion and a lifter mechanism that changes the inclination of the cushion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-285674 Summary of the Invention [Problem to be solved by the invention]

[0004] The vehicle seat with a tip-up mechanism described in Patent Document 1 is equipped with a lifter mechanism to change the inclination of the seat cushion, but is not provided with a lifting mechanism to adjust the height of the seat cushion. This makes it difficult to arrange the seat to suit the physique of the occupant when they sit in it. Furthermore, vehicle seats with a tip-up mechanism or the like are provided with a locking mechanism that locks the position of the frame in the flipped-up state. Conventionally, a wiring member such as an operating wire is routed along the frame to operate the locking mechanism or the like, but if the frame deforms depending on the state of the vehicle seat, it has been necessary to appropriately position the wiring member to prevent breakage or the like.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a vehicle seat having a tip-up mechanism that improves the degree of freedom in seat arrangement. Another object of the present invention is to provide a vehicle seat in which wiring members are appropriately arranged. [Means for solving the problem]

[0006] The above problem is solved by the vehicle seat of the present invention, which comprises a seat cushion having a cushion main body portion, a seat back, and a tip-up mechanism for flipping up the cushion main body portion, wherein the cushion main body portion is rotatably attached to the seat back and is freely displaceable between a normal state in which an occupant can be seated and an upright state in which the cushion main body portion is upright and parallel to the seat back by the tip-up mechanism, wherein the cushion main body portion is configured to be able to lock the position of the cushion main body portion in the upright state, and the seat cushion comprises a lifting mechanism for raising and lowering the cushion main body portion and the seat back in the vertical direction. By providing a cushion body that can be displaced into an upright position by a tip-up mechanism and a lifting mechanism that raises and lowers the cushion body and seat back in the vertical direction, a vehicle seat with a tip-up mechanism can be provided that offers increased freedom in seat arrangement. In other words, in the normal state, the height of the seat cushion can be changed to suit the physique of the seated occupant, and the vehicle seat can be stored by flipping up the cushion body into the tip-up state.

[0007] In the above configuration, the seat cushion has a cushion frame that forms the skeleton of the seat cushion, and the cushion frame has a first frame that forms the skeleton of the cushion main body and a second frame that is arranged below the first frame and supports the first frame, the first frame has a first leg that is connected to the second frame and supports the front of the cushion main body, the second frame has a second leg that is rotatably arranged as the lifting mechanism, and the first leg has an upper end attached to the first frame and a lower end that is detachably attached to the second frame. The lower end side of the first leg that supports the cushion main body is removably attached to the second frame, so that, for example, by removing the first leg, the cushion main body can be flipped up by the tip-up mechanism, thereby improving the freedom of seat arrangement.

[0008] Furthermore, in the above configuration, the second frame may have a pair of side frames arranged on both sides in the seat width direction, a connecting frame spanning the pair of side frames, and a leg holding portion provided on the connecting frame for detachably fixing the lower end side of the first leg portion. By providing a leg holder for fixing the first leg to the connecting frame of the lifting mechanism (second frame), it is possible to achieve both a tip-up mechanism and a lifting mechanism. In addition, since the leg holder is provided on the connecting frame, the rigidity of the leg holder is improved.

[0009] In addition, in the above configuration, the connecting frame has a leg lock portion that fixes the lower end side of the first leg portion, and the leg holding portion and the leg lock portion are preferably positioned inward from the outer end of the second frame in the seat width direction. By arranging the leg holding portion and the leg lock portion inward from the outer end of the second frame, the vehicle seat can be made more compact.

[0010] In the above configuration, the connecting frame may be connected to a rotation shaft of the second leg portion. Since the connecting frame is connected to the rotation axis of the second leg, which is the lifting function, the second frame is prevented from being pulled in the vertical direction when, for example, attaching or detaching the first leg.

[0011] In the above configuration, it is preferable to include a cover member that covers the second frame. Even when the cushion main body is flipped up into an upright position, the second frame is covered with the cover member, improving the appearance.

[0012] In the above configuration, each of the pair of side frames has a bent portion that bends inward in the seat width direction and an extension portion that extends from the bent portion toward the front of the seat, and the cover member is preferably fixed to the extension portion. By having the side frames have bent portions that bend inward in the seat width direction, the extension portions are positioned on the inside of the seat, which makes it possible to secure space for fixing the cover member, thereby making the vehicle seat more compact.

[0013] In the above configuration, the cover member has a side cover portion that covers the side of the second frame and a central cover portion that covers the connecting frame, and a leg movement regulating portion that regulates the movement of the first leg may be provided on the central cover portion. By providing the leg movement restricting portion on the central cover portion, movement of the first leg is more firmly restricted when the unit is raised or lowered.

[0014] In the above configuration, the seat cushion may include a slide rail device that moves the seat cushion and the seat back in the fore-and-aft direction of the seat, and a connecting bracket that rotatably fixes the second leg to the slide rail device, wherein the seat back is connected to the seat cushion and configured to be foldable toward the seat cushion, the seat cushion is displaceable into a collapsed state in which the cushion main body collapses forward, and the first leg is configured to be rotatable so as to collapse the cushion main body forward in conjunction with the action of folding the seat back toward the seat cushion, and in the collapsed state, the side cover portion of the cover member may be positioned outward from the outer end of the connecting bracket and inward from the first frame in the seat width direction. In the collapsed state, interference of the cover member with the cushion frame is suppressed, allowing the cover member to be arranged more compactly.

[0015] In the above configuration, the cover member may be configured such that, in the collapsed state, an upper end of the cover member is positioned lower than an upper end of the cushion frame. By configuring the cover member so that the upper end portion is positioned lower than the upper end portion of the cushion frame in the reclined state, the vehicle seat can be made thinner in the reclined state. [Effects of the Invention]

[0016] According to the vehicle seat of the present invention, a vehicle seat with a tip-up mechanism can be provided that has an improved degree of freedom in seat arrangement by including a cushion main body that can be displaced into an upright position by a tip-up mechanism and an elevation mechanism that raises and lowers the cushion main body and seat back in the vertical direction. That is, in the normal state, the height of the seat cushion can be changed to suit the physique of the seated occupant, and the vehicle seat can be stored in the tip-up state with the cushion main body flipped up. Furthermore, since the lower end side of the first leg portion that supports the cushion main body portion is removably attached to the second frame, for example, by removing the first leg portion, the cushion main body portion can be flipped up by the tip-up mechanism, thereby improving the freedom of seat arrangement. Furthermore, by providing a leg holder for fixing the first leg to the connecting frame of the lifting mechanism (second frame), it is possible to achieve both the tip-up mechanism and the lifting mechanism. Furthermore, since the leg holder is provided on the connecting frame, the rigidity of the leg holder is improved. By arranging the leg holding portion and the leg lock portion inward from the outer end of the second frame, the vehicle seat can be made more compact. Furthermore, since the connecting frame is connected to the rotation axis of the second leg, which is responsible for the lifting function, the second frame is prevented from being pulled in the vertical direction when, for example, attaching or detaching the first leg. Furthermore, even when the cushion main body is flipped up into an upright position, the second frame is covered with the cover member, improving the appearance. Furthermore, by having the side frames bent inward in the seat width direction, the extensions are positioned on the inside of the seat, which makes it possible to secure space for fastening the cover member, thereby making the vehicle seat more compact. Furthermore, by providing the leg movement restricting portion on the central cover portion, movement of the first leg is more firmly restricted when the unit is raised or lowered. Furthermore, in the collapsed state, interference of the cover portion with the cushion frame is suppressed, allowing the cover member to be arranged more compactly. Furthermore, by configuring the cover member so that the upper end of the cover member is positioned lower than the upper end of the cushion frame in the reclined state, the vehicle seat can be made thinner in the reclined state. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view of a vehicle seat according to an embodiment of the present invention, seen obliquely from the front. [Figure 2] FIG. 2 is a perspective view showing a seat frame in a height-raised state. [Figure 3] FIG. 4 is an explanatory diagram showing the seat frame in a normal state. [Figure 4] FIG. 10 is an explanatory diagram showing the seat frame in the height-raised state. [Figure 5] FIG. 4 is an explanatory diagram showing the seat frame in a folded state. [Figure 6] 10 is an explanatory diagram showing the seat frame in an upright state with the cushion body portion flipped up in a height-raised state. FIG. [Figure 7] FIG. 4 is an explanatory diagram showing the seat frame in a reclined state. [Figure 8] FIG. 10 is a perspective view showing the height frame in a folded state. [Figure 9] FIG. 10 is a perspective view showing a state in which a cover member is attached to a height frame in a folded state. [Figure 10] FIG. 2 is a top view showing the height frame and slide rail device in a folded state. [Figure 11]10 is a top view showing the state in which the cover member is attached to the height frame and slide rail device in the folded state. FIG. [Figure 12] FIG. 11 is a cross-sectional view taken along line XII-XII in FIG. [Figure 13] 13 is a cross-sectional view taken along line XIII-XIII in FIG. 11, showing a state in which a cover member is attached. [Figure 14] FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. [Figure 15] 14 is a cross-sectional view taken along line XIV-XIV in FIG. 11, showing the state in which the detachable leg part is locked. [Figure 16] FIG. 2 is a perspective view of the inertial leg locking portion as seen obliquely from the rear. [Figure 17] FIG. 10 is a side view showing the first locking portion in a normal state. [Figure 18] FIG. 10 is a side view showing the first locking portion in a tip-up state. [Figure 19] FIG. 10 is a side view showing the first locking portion in the reclining state. [Figure 20] FIG. 4 is an enlarged top view showing the periphery of a first locking portion. [Figure 21] FIG. 4 is a top view showing the wiring state of the wiring member. [Figure 22] FIG. 4 is a perspective view of the wiring member as viewed from inside the seat. [Figure 23] FIG. 4 is a perspective view of the routing member as viewed from outside the seat. [Figure 24] FIG. 10 is a top view showing an arrangement state of a wiring member according to a first modified example. [Figure 25] FIG. 10 is a side view showing the cushion frame in a normal state, illustrating the routing state of the routing member of the first modified example. [Figure 26] FIG. 10 is a side view showing the cushion frame in a reclining state, illustrating the routing state of the routing member of the first modified example. [Figure 27] FIG. 10 is a side view showing the cushion frame in a normal state, illustrating the routing state of the routing member of the second modified example. [Figure 28]FIG. 10 is a side view showing the frame in a reclining state, illustrating the routing state of the routing member of the second modified example. [Figure 29] FIG. 10 is a side view showing the second locking portion. DETAILED DESCRIPTION OF THE INVENTION

[0018] The configuration of a vehicle seat according to an embodiment of the present invention (the present embodiment) will be described below with reference to the drawings. However, the embodiment described below is an example for facilitating understanding of the present invention and is not intended to limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and of course, the present invention also includes equivalents thereof.

[0019] In the following, a vehicle seat S provided in a vehicle automobile such as a minivan will be taken as an example of a vehicle seat, and an example of the configuration thereof will be described. In the following description, the "seat front-rear direction" refers to the front-rear direction of the vehicle seat S, which is the direction that coincides with the traveling direction when the vehicle is traveling. The "seat width direction" refers to the width direction of the vehicle seat S, which is the direction that coincides with the left-right direction as seen by an occupant seated in the vehicle seat S. The "up-down direction" refers to the up-down direction of the vehicle seat S, which is the direction that coincides with the vertical direction when the vehicle is traveling on a horizontal plane. Additionally, the outer and inner sides are defined based on the occupant. That is, the direction toward the center of the seat width direction is the inward direction, and the direction away from it is the outward direction. A common number is assigned to a pair of left and right components, and when specifying the left and right, the name indicating the component is given "left side" or "right side," and the letter "L" or "R" is added to the reference symbol. Note that when there is no need to distinguish between the left and right sides, only the common number may be used for explanation.

[0020] As shown in FIG. 1, the vehicle seat S is a seat placed on the floor of the vehicle and in which a vehicle occupant sits. In this embodiment, the vehicle seat S is a seat that is disposed on the right side (behind the driver's seat) of the rear seats corresponding to the rear seats of the vehicle. The vehicle seat S can also be used as a middle seat in the second row or a third seat in the third row in a vehicle that has three rows of seats in the longitudinal direction of the vehicle. The vehicle seat S may also be used as a front seat corresponding to the front seats.

[0021] The vehicle seat S of this embodiment is configured to be able to transition to a plurality of states. Hereinafter, a state in which an occupant can sit in the vehicle seat S in an edge-sitting position (sitting with legs down) will be referred to as the "normal state" of the vehicle seat S (see FIGS. 1 and 3). A state in which the seat back 2 is rotated rearward of the seat cushion 1 from the normal state will be referred to as the "reclining state" of the vehicle seat S (see FIG. 7). On the other hand, a state in which the position of the seat cushion 1 is higher than the position in the normal state (see FIGS. 2 and 4) will be referred to as the "height-raised state." A state in which the seat cushion 1 is moved to collapse (sink) onto the vehicle floor and the entire vehicle seat S is folded (see FIG. 5) will be referred to as the "folded state." The folded state may also be referred to as the "dive-down state." A state in which the seat cushion 1 is simply moved to collapse onto the vehicle floor, regardless of the state of the seat back 2, may also be referred to as the "collapsed state." Furthermore, the state in which the height of the seat cushion 1 is lowered to the lowest by the height link HL, which is the lifting mechanism LM, may be referred to as the "height-down state."

[0022] The vehicle seat S of this embodiment is also equipped with a tip-up mechanism CM that flips up the cushion main body 1h that supports the buttocks of the occupant, and is configured to be able to set the cushion main body 1h to an "upright state" in which the tip-up mechanism CM stands up so that the cushion main body 1h is approximately parallel to the seat back 2 (see FIG. 6). The vehicle seat S is configured to be freely displaceable between a normal state and an upright state. Furthermore, the cushion main body 1h is configured to be able to lock the position of the cushion main body 1h in the upright state. Therefore, with the cushion main body 1h in an upright state, the vehicle seat S can be moved forward by the slide rail device 6, thereby widening the luggage compartment at the rear of the vehicle. The seat cushion 1 of the vehicle seat S is equipped with a lifting mechanism LM that raises and lowers the cushion main body 1h and the seat back 2 in the vertical direction. The occupant can use the lifting mechanism LM to raise the height of the vehicle seat S. The occupant can also use the lifting mechanism LM to raise the cushion main body 1h and the seat back 2 higher than their normal positions by flipping up the cushion main body 1h and standing up.

[0023] In this way, the vehicle seat S having the tip-up mechanism CM can be freely displaced between the normal state, reclining state, height-raised state, folded state, and upright state, thereby improving the freedom of seat arrangement.

[0024] The occupant can move the entire seat forward or backward by operating a slide rail operation lever 41 located on the front right side of the seat cushion 1. Also, by operating a height frame operation lever 42 located on the front left side of the seat cushion 1, the lifting mechanism LM is unlocked, allowing the height of the cushion main body 1h to be changed. Also, by operating a reclining operation lever 40 located on the shoulder of the seat back 2, the seat back 2 can be rotated forward or backward and reclined. Furthermore, unless otherwise specified, the shape, position, and posture of each part of the vehicle seat S described below will be described assuming that the vehicle seat S is in a normal state.

[0025] <Vehicle seat S> The overall configuration of a vehicle seat S according to this embodiment will be outlined with reference to the drawings. Fig. 1 is a perspective view of the vehicle seat S according to this embodiment as seen obliquely from the front, showing the vehicle seat S in a normal state. Note that in Fig. 1, for convenience of illustration, a portion of the vehicle seat S is shown with the cover material Tr removed and the pad material P exposed. Fig. 2 is a perspective view showing the seat frame F of the vehicle seat S in a height-raised state.

[0026] Fig. 3 is an explanatory diagram showing the seat frame F in the normal state, Fig. 4 is an explanatory diagram showing the seat frame F in the height-raised state, and Fig. 5 is an explanatory diagram showing the seat frame F in the folded state. Fig. 6 is an explanatory diagram showing the seat frame F in the height-raised state in which the cushion main body 1h is flipped up. Fig. 7 is an explanatory diagram showing the seat frame F in the reclined state. Fig. 8 is a perspective view showing the height frame 20 in the folded state, showing the state where the cover member 110 of the height frame 20 has been removed. Fig. 9 is a perspective view showing the height frame 20 in the folded state, showing the state where the cover member 110 of the height frame 20 has been attached.

[0027] Fig. 10 is a top view showing the height frame 20 and slide rail device 6 in the folded state, and Fig. 11 is a top view showing the state with the cover member 110 attached. Fig. 12 is a cross-sectional view taken along line XII-XII in Fig. 10, and Fig. 13 is a cross-sectional view taken along line XIII-XIII in Fig. 11, showing the state with the cover member 110 attached.

[0028] As shown in Fig. 1, the vehicle seat S according to this embodiment mainly comprises a seat cushion 1, a seat back 2, a headrest 3, a reclining device 5, and a slide rail device 6. In the following description, the seat cushion 1, the seat back 2, and the headrest 3 may be collectively referred to as a seat body Sh. A buckle for a seat belt 9 is provided on the left rear portion of the seat cushion 1. 2, a seat frame F that forms the framework of the vehicle seat S is provided inside the vehicle seat S. The seat frame F includes a cushion frame Cf, a back frame 30, and a headrest frame 36.

[0029] In the following, the seat back 2, headrest 3, reclining device 5, and slide rail device 6 of the vehicle seat S will first be described, and then the seat cushion 1, which is the main feature of this embodiment, will be described.

[0030] <Seatback 2> The seat back 2 is a support member that supports the back of a seated occupant, and supports the seated occupant from behind. As shown in FIG. 2, the seat back 2 has a back frame 30 that forms the skeleton of the seat back 2. The seat back 2 has a back frame padding material P that covers the back frame 30, and a cover material Tr that covers the padding material P. The padding material P is a cushioning material, and is formed, for example, from a urethane resin (foamed resin) such as soft polyurethane foam. The padding material P may be formed from biomass urethane. Furthermore, the cover material Tr that covers the padding material P is formed, for example, from a stretchable synthetic leather material. The cover material Tr may be formed from cloth, film, leather, etc.

[0031] The back frame 30 is a frame body having a substantially rectangular shape when viewed from the front. The back frame 30 mainly comprises a pair of back side frames 31, a side connecting frame 32, a back upper frame 33, a back lower frame 34, and a pressure plate 35. The pair of back side frames 31 are elongated frame members extending in the vertical direction and are disposed apart from each other while facing each other in the seat width direction. The side connecting frame 32 is connected to the lower end of the back side frame 31 and the reclining device 5. In addition, the side connecting frame 32 is connected to the upper end (rear end) of the rear cushion side frame 12 of the cushion frame Cf, which will be described later.

[0032] The back upper frame 33 connects the upper ends of the left and right back side frames 31, and the back lower frame 34 connects the lower ends of the left and right back side frames 31. The pressure plate 35 is a plate-shaped member attached to the rear side of the back frame 30 and supports the weight of a seated occupant.

[0033] The seat back 2 is connected to the seat cushion 1 and is configured to be foldable toward the seat cushion 1 as shown in FIG. When the seat back 2 is folded, the detachable leg portions 16 of the seat cushion 1, which will be described later, rotate to cause the seat cushion 1 to fall forward in conjunction with the operation of folding the seat back 2 toward the seat cushion 1. At this time, the height links HL (front height links 22 and rear height links 23) of the seat cushion 1 also rotate toward the rear of the seat in conjunction with the operation of folding the seat back 2 toward the seat cushion 1, thereby lowering the height of the seat cushion 1. The detachable leg portion 16 and the height link HL move in conjunction with the seat back 2, so that the vehicle seat S can be easily folded (folded down).

[0034] <Headrest 3> The headrest 3 is a support member that supports the head of a seated occupant from behind. As shown in Fig. 2, the headrest 3 has a headrest frame 36 that forms the skeleton of the headrest 3. The headrest 3 has a headrest padding material (not shown) that covers the headrest frame 36, and a skin material Tr that covers the padding material.

[0035] <Reclining device 5> The reclining device 5 rotatably connects the seat back 2 to the seat cushion 1. More specifically, as shown in FIGS. 3 to 7, the reclining device 5 connects the rear end of the height frame 20 and the lower end of the back frame 30 that constitute the seat cushion 1. The reclining device 5 rotates the seat back 2 rearward relative to the seat cushion 1, thereby transitioning the vehicle seat S to a reclined state. The reclining device 5 also rotates the seat back 2 forward relative to the seat cushion 1, thereby transitioning the vehicle seat S to a folded state.

[0036] <Slide rail device 6> As shown in Figures 1 and 2, the slide rail device 6 connects the seat body Sh of the vehicle seat S to the vehicle floor so that it can slide in the front-rear direction of the seat. The movement direction of the slide rail device 6 is not limited to the front-rear direction of the seat, but may also be the seat width direction (left-right direction). In other words, the slide rail device 6 may connect the vehicle seat S to the vehicle floor so that it can slide in the seat width direction. In other words, the slide rail device 6 is a device that moves the seat cushion 1 of the vehicle seat S in a predetermined direction.

[0037] As shown in FIG. 1, the slide rail device 6 is provided below the vehicle seat S. The slide rail device 6 has a known structure (the structure of a general slide rail mechanism). In detail, the slide rail device 6 has a lower rail 61 fixed to the floor and an upper rail 62 that is slidable in the front-to-rear direction relative to the lower rail 61. The slide rail device 6 also has a slide lock device 63 that restricts the sliding movement of the upper rail 62 relative to the lower rail 61. The slide lock device 63 can release the restriction on the sliding movement by operating a slide rail operating lever 41 provided on the seat cushion 1.

[0038] The slide lock device 63 also has a lock operation lever 63a that protrudes from the top surface of the upper rail 62 and is used to release the lock. The lock operation lever 63a is connected to a wire 64 that extends from the slide rail operation lever 41, and can be released by being pulled. When the pulling by the wire 64 is released, the lock operation lever 63a is returned to its original position by the spring member 63b and is locked again.

[0039] As described above, the upper rail 62 is provided with the front connecting bracket 43 and the rear connecting bracket 44. The upper rail 62 is connected to the height link HL of the cushion frame Cf via the front connecting bracket 43 and the rear connecting bracket 44. When the vehicle seat S is in a normal state, the height of the seat cushion 1 can be changed by rotating the height link HL in an upright direction, and the vehicle seat S can be brought into a height-raised state. The vehicle seat S is equipped with a slide rail device 6 and a height link HL rotatably connected to the slide rail device 6, which allows the seat cushion 1 to be moved in a predetermined direction (in the fore-and-aft direction of the seat in this embodiment) while changing the height of the seat cushion 1, thereby improving the freedom of seat arrangement.

[0040] <Seat cushion 1> The seat cushion 1 is a support member that supports the buttocks of a seated occupant (hereinafter sometimes referred to as a seated person), and supports the seated occupant from below. The seat cushion 1 has a cushion main body 1h that directly supports the buttocks of the occupant. As described above, the seat cushion 1 also has a tip-up mechanism CM that flips up the cushion main body 1h and stands up, and a lifting mechanism LM that raises and lowers the cushion main body 1h and the seat back 2 in the vertical direction.

[0041] 2, the seat cushion 1 includes a cushion frame Cf that forms the skeleton of the seat cushion 1. The cushion frame Cf of this embodiment is composed of a cushion main body frame 10 that forms the skeleton of the cushion main body 1h that directly supports the seated occupant, and a height frame 20 that is disposed below the cushion main body frame 10 and supports the cushion main body frame 10. The cushion main body frame 10 corresponds to the first frame of the present invention, and the height frame 20 corresponds to the second frame.

[0042] The cushion main body 1h is a part composed of a cushion main body frame 10, a pad material P, and a skin material Tr, and directly supports the buttocks of an occupant. As shown in Fig. 1, a pad material P for a seat cushion is placed on the cushion main body frame 10, and the pad material P is covered with a skin material Tr.

[0043] <Cushion body frame 10> The cushion main body frame 10 is a frame body having a rectangular shape when viewed from above. The cushion main body frame 10 has a pair of cushion side frames 11, 11 that constitute the frame body, a pan frame 14 that connects the pair of cushion side frames 11, 11, and a cushion frame member 15. The cushion main body frame 10 has a detachable leg portion 16 at its front end that is connected to the height frame 20 and supports the front of the cushion main body portion 1h. The detachable leg portion 16 corresponds to a first leg portion.

[0044] Furthermore, the rear end of the cushion main body frame 10 is rotatably attached to the back frame 30 of the seat back 2 via a flip-up pivot shaft 12b. That is, a tip-up mechanism CM is configured by the detachable leg portion 16 and the flip-up pivot shaft 12b, and the cushion main body 1h can be flipped up and erected by detaching the leg connecting portion 16b of the detachable leg portion 16 from the leg holding portion 100. In other words, the cushion main body 1h is rotatably attached to the seat back 2, and is configured to be displaceable between a normal state in which an occupant can be seated and an erect state in which the cushion main body 1h is erected parallel to the seat back 2 by the tip-up mechanism CM.

[0045] <Detachable leg part 16> The cushion main body frame 10 also has detachable legs 16 that are connected at their front ends to the height frame 20 and support the front of the cushion main body 1h. The detachable legs 16 are made of pipe material that is U-shaped when viewed from the front, and are composed of a leg body 16a that extends from the cushion side frame 11 and a leg connecting portion 16b that connects the leg body 16a at its lower end and extends in the seat width direction (see Figures 9 and 13, etc.). When the vehicle seat S is in the normal state, the leg connecting portion 16b is held by a leg holding portion 100, which will be described later, to support the front end of the cushion main body 1h, allowing the occupant to sit on the seat cushion 1.

[0046] The detachable leg 16 is attached to the cushion side frame 11 so as to be rotatable around a leg rotation shaft 16c. Specifically, as shown in Figure 23, the detachable leg 16 is rotatably attached to the inner side surface of the front cushion side frame 13 of the cushion side frame 11 via a leg attachment bracket 45. Therefore, as shown in Figure 6, when the cushion main body 1h is raised, the detachable leg portion 16 can be stored within the cushion main body frame 10 by rotating the detachable leg portion 16 in the direction of arrow A.

[0047] Furthermore, a wire 201 that connects to a first locking unit 210 (described later) is connected to the detachable leg 16, and the first locking unit 210 can be unlocked by rotating the detachable leg 16 so that it stands up from its stored state. After the first locking unit 210 is unlocked, the cushion main body 1h can be tilted toward the front of the seat to return to its normal state.

[0048] <Cushion side frame 11> The cushion side frame 11 is composed of a right cushion side frame 11R disposed on the right side of the cushion main body frame 10 and a left cushion side frame 11L disposed on the left side. The right cushion side frame 11R and the left cushion side frame 11L extend in the front-to-rear direction. As shown in FIG. 2, the right cushion side frame 11R and the left cushion side frame 11L extend in different directions, with the right cushion side frame 11R bending outward (to the right) at the front and then extending in the front-to-rear direction. This makes it possible to ensure a seating space for the occupant while preventing the right cushion side frame 11R from interfering with other interior components arranged in the vehicle.

[0049] <Bending mechanism> Each of the cushion side frames 11 has a folding mechanism. Specifically, the right cushion side frame 11R and the left cushion side frame 11L have a rear cushion side frame 12 and a front cushion side frame 13 that are rotatably connected around a folding pivot shaft 12a (see FIGS. 2 and 3). In other words, each cushion side frame 11 is divided in the front-rear direction of the seat and has a rear cushion side frame 12, a front cushion side frame 13 aligned with the rear cushion side frame 12 in the front-rear direction, and a folding pivot 12a that movably connects the rear cushion side frame 12 and the front cushion side frame 13. The rear cushion side frame 12 is rotatably connected to the back frame 30 via a flip-up pivot 12b at a position rearward of the folding pivot 12a.

[0050] The left rear cushion side frame 12L is provided with a stopper 12c and a side rotation restricting member 12d. The stopper 12c comes into contact with the upper end of the left front cushion side frame 13L, thereby preventing the left front cushion side frame 13L from bending upward toward the seat (see FIG. 20).

[0051] The left front cushion side frame 13L is located behind the left front cushion side frame 12L and has a frame rear portion 13a connected to the left rear cushion side frame 12L via a center-bending pivot shaft 12a, a frame bending portion 13b bending outward in the seat width direction from the front end of the frame rear portion 13a, and a frame extension portion 13c extending forward of the seat from the front end of the frame bending portion 13b (see Figure 20). The rear cushion side frame 12 corresponds to a first side frame, and the front cushion side frame 13 corresponds to a second side frame. The folding pivot shaft 12a corresponds to a connecting pivot shaft.

[0052] <Pan frame 14 and cushion frame member 15> The pan frame 14 is made of a plate-like member and connects the front ends of the cushion side frames 11. The cushion frame members 15 are made of a pipe material and connect the central portions in the front-to-rear direction of the cushion side frames 11. A portion of the cushion frame member 15 is bent rearward, and the central portion of the cushion frame member 15 in the seat width direction is curved so that it is positioned rearward.

[0053] 2, a plurality of S-springs 18 are attached to the cushion main body frame 10 as pressure-receiving members that receive the load of the seated occupant, spanning the pan frame 14 and the cushion frame member 15. As described above, the central portion of the cushion frame member 15 has a shape that curves backward, so that the S-springs 18 can receive the load of the seated occupant over a wide area in the front-to-rear direction. In this embodiment, the pressure-receiving member is made up of a plurality of S-springs 18, but is not limited to this. The pressure-receiving member provided on the cushion main body frame 10 may be made up of an elastic plate-shaped member.

[0054] 1 and 2, the seat cushion 1 is provided with a slide rail operating lever 41 for operating the slide rail device 6 in front of the right front cushion side frame 13R. Also, a height frame operating lever 42 for operating the height frame 20 is provided in front of the left front cushion side frame 13L. A wire 109 is connected to the height frame operating lever 42, which can unlock the liftable portion 7 described below. Also, the height frame operating lever 42 is attached to the front end of the left front cushion side frame 13L by an operating lever mounting bracket 47 (see FIG. 22).

[0055] An ottoman for supporting the legs of a seated person may be provided on the seat cushion 1. When an ottoman is provided, an ottoman support mechanism (not shown) for supporting the ottoman may be provided between the slide rail operation lever 41 and the height frame operation lever 42.

[0056] <Height frame 20> The cushion frame Cf includes the height frame 20 below the cushion main body frame 10 to support the cushion main body frame 10 as described above. The height frame 20 is a frame body having a rectangular shape when viewed from above, and includes a pair of height side frames 21, 21 (side frames) that constitute the frame body, a front height frame member 24, an intermediate height frame member 25, a rear height frame member 26, and a connecting shaft 27. The connecting shaft 27 is composed of a front connecting shaft 27a located at the front and a rear connecting shaft 27b located at the rear. The front connecting shaft 27a is connected to a first rotating shaft 22a of the front height link 22, which will be described later, and the rear connecting shaft 27b is connected to a first rotating shaft 23a of the rear height link 23, which will be described later. The pair of height side frames 21, 21 correspond to a pair of side frames, and the front height frame member 24 and the front connecting shaft 27a correspond to a connecting frame.

[0057] <Height Link HL> The height frame 20 has a height link HL that is rotatably provided as the lifting mechanism LM. The height link HL corresponds to the second leg. More specifically, the height frame 20 has a front height link 22 and a rear height link 23 that are interposed between the height side frame 21 and the slide rail device 6. Hereinafter, when there is no need to distinguish between the front height link 22 and the rear height link 23, they may be collectively referred to simply as the height link HL. The front height link 22 arranged on the right side of the vehicle seat S may be referred to as the right front height link 22R, and the front height link 22 arranged on the left side may be referred to as the left front height link 22L. The rear height link 23 arranged on the right side of the vehicle seat S may be referred to as the right rear height link 23R, and the rear height link 23 arranged on the left side may be referred to as the left rear height link 23L.

[0058] <Height Side Frame 21> The height side frame 21 is composed of a right height side frame 21R arranged on the right side of the height frame 20 and a left height side frame 21L arranged on the left side. The right height side frame 21R and the left height side frame 21L have an elongated shape and extend in the front-to-rear direction. The right height side frame 21R and the left height side frame 21L are plate-like bodies that, when viewed from the side, have a generally triangular shape that increases in height toward the rear.

[0059] As shown in FIG. 10, the height side frames 21 of the height frame 20 have bent portions 21a that bend inward in the seat width direction at the front of the height side frames 21, and extended portions 21b that extend forward from the bent portions 21a.

[0060] 8 and 10, the left height side frame 21L has portions near its center that are bent toward the outside and inside of the seat. This allows the left height side frame 21L to be positioned above the slide rail device 6 while avoiding interference with the slide lock device 63 and front connecting bracket 43 provided on the slide rail device 6.

[0061] An extended height side frame 21E is provided on the right side of the right height side frame 21R. The extended height side frame 21E is connected to the right height side frame 21R via a rear height frame member 26 and two connecting pipes 21Ea. However, the number and arrangement of the connecting pipes 21Ea are not limited to those shown in Figures 4 and 5. Three or more connecting pipes 21Ea may connect the right height side frame 21R and the extended height side frame 21E.

[0062] The front end of the right height side frame 21R and the front end of the left height side frame 21L are connected by a front height frame member 24. In addition, the rear end of the right height side frame 21R and the rear end of the left height side frame 21L are connected by a rear height frame member 26. The front height frame member 24 and the rear height frame member 26 are made of round pipe material that extends linearly.

[0063] An intermediate height frame member 25 is provided between the front height frame member 24 and the rear height frame member 26, and the intermediate height frame member 25 connects the right height side frame 21R and the left height side frame 21L. The intermediate-height frame member 25 is made of a straight round pipe material, but is not limited to this. For example, the intermediate-height frame member 25 may have a curved shape to avoid interference with other members. As a specific example, the intermediate-height frame member 25 may have a shape in which the center portion in the seat width direction is curved rearward.

[0064] The front height links 22 and rear height links 23 are formed of long, plate-like members. The front height links 22 are rotatably connected to the height side frames 21 via first pivot shafts 22a. A front connecting bracket 43 is provided on the upper surface of the slide rail device 6, and the front height links 22 are rotatably connected to the slide rail device 6 via second pivot shafts 22b provided on the front connecting bracket 43. The left and right first pivot shafts 22a are connected by a front connecting shaft 27a (see FIG. 10). The front height links 22 are driven link mechanisms that operate in response to the movement of the rear height links 23.

[0065] 10, the left and right front height links 22 are connected by a front height link member 28. The front height link member 28 is made of a long plate-like member. The front height link member 28 is attached so as to be located in front of the front connecting shaft 27a when the vehicle seat S is in the folded state.

[0066] As shown in FIGS. 2 and 4, the rear height links 23 are rotatably connected to the height side frames 21 via first pivot shafts 23a. The rear height links 23 are rotatably connected to the slide rail devices 6 via second pivot shafts 23b provided on the rear connecting brackets 44. The left and right first pivot shafts 23a are connected by a rear connecting shaft 27b, as shown in FIG. 10. The rear connecting shaft 27b is provided with a lifting / lowering unit 7 that rotates the rear height links 23 and raises and lowers the seat surface of the seat cushion 1. The rear height links 23 are a driven link mechanism that is driven when the height frame operating lever 42 is operated. A wire 109 extends from the height frame operating lever 42 to the lifting / lowering unit 7 (see FIG. 22), enabling the lifting / lowering unit 7 to be unlocked. As shown in FIGS. 8 and 10, the rear height links 23 provided on the left and right sides are connected by a rear height link member 29 formed in a pipe shape.

[0067] The front height links 22 and the rear height links 23 rotate so as to stand upright forward relative to the slide rail device 6, thereby raising the cushion main body frame 10. This causes the vehicle seat S to transition from the normal state shown in Fig. 3 to the height-raised state shown in Fig. 4. Conversely, the front height links 22 and the rear height links 23 rotate so as to lean backward relative to the slide rail device 6, thereby lowering the cushion main body frame 10. This causes the vehicle seat S to transition from the height-raised state shown in Fig. 4 to the normal state shown in Fig. 3.

[0068] <Leg holding part 100> The leg holder 100 will be described with reference to Figures 14 to 16. The leg holder 100, which holds the leg connecting portion 16b of the detachable leg portion 16, is provided in front of the height frame 20. The leg holder 100 detachably fixes the leg connecting portion 16b, which is the lower end side of the detachable leg portion 16. Also provided is an inertial leg locking portion 101 that clamps the detachable leg portion 16 and fixes the leg connecting portion 16b of the detachable leg portion 16. The inertial leg locking portion 101 corresponds to a leg locking portion.

[0069] More specifically, as described above, the front height frame member 24 and the front connecting shaft 27a that are bridged across the height side frames 21 are provided at the front end of each height side frame 21. The leg holding unit 100 has a holding member support unit 103 that is disposed between the front height frame member 24 and the front connecting shaft 27a, and the leg holding unit 100 and the inertial leg lock unit 101 are attached to the holding member support unit 103. As shown in Figures 14 and 15, the leg holding portion 100 consists of a roughly U-shaped clip member that detachably holds the detachable leg portion 16, and is supported by the holding member support portion 103 with its opening facing diagonally upward and forward.

[0070] The leg holder 100 is composed of a pair of side walls 100a, 100a and a bottom wall 100b connecting the lower ends of the side walls 100a. The side walls 100a are bent from their lower ends toward their upper ends so as to approach each other; in other words, they are bent so as to narrow the opening of the leg holder 100. The upper ends are formed with curled portions 100c that are bent outward toward the opening. The pair of curled portions 100c, 100c each pass through an opening 114a provided in the central cover 112 shown in FIG. 14 and are exposed to the outside on the detachable leg unit 16 side.

[0071] In addition, an inertial leg locking section 101 is arranged adjacent to the leg holding section 100, which locks the leg connecting section 16b of the detachable leg section 16 in a held state on the leg holding section 100, for example, in the event of a rear-end collision of the vehicle. The inertial leg locking unit 101 is a C-shaped member in side view and has an upper gripping portion 101a that grips the upper side of the leg connecting portion 16b and a lower gripping portion 101b that grips the lower side of the leg connecting portion 16b. The inertial leg locking unit 101 is configured to be rotatable around a locking rotation shaft 101c provided below. As shown in FIG. 15, the leg connecting portion 16b is inserted through the opening of the leg holding unit 100 and the lower gripping portion 101b is pushed downward, causing the entire inertial leg locking unit 101 to rotate. As a result, the upper gripping portion 101a grips the upper side of the leg connecting portion 16b, thereby locking the leg connecting portion 16b.

[0072] 10, the leg holding portion 100 and the inertial leg lock portion 101 are disposed inside the outer end portion of the height frame 20. This allows the vehicle seat S to be made more compact.

[0073] 16, a biasing spring 101e that biases the inertial leg locking part 101 to rotate is attached to the inertial leg locking part 101. One end of the biasing spring 101e is hooked on a spring hook part 101d, so that the inertial leg locking part 101 is biased when the lock is released.

[0074] The holding member support portion 103 is disposed near the center in the seat width direction. A first reinforcing base 104, which reinforces the front portion of the height frame 20, is attached to the right of the holding member support portion 103, bridging between the front height frame member 24 and the front connecting shaft 27a. Furthermore, a second reinforcing base 105, which reinforces the front portion of the height frame 20, is attached to the left of the holding member support portion 103, bridging between the front height frame member 24 and the front connecting shaft 27a. By providing the first reinforcing base 104 and the second reinforcing base 105, the height frame 20 is reinforced, and the rise of the height frame 20 when the detachable leg portion 16 is detached can be suppressed.

[0075] The first reinforcing base 104 has a flange formed on its right end and is attached by welding to the inner surface of the right height side frame 21R at its upper end, preventing the first reinforcing base 104 from interfering with the right front height link 22R even when the right front height link 22R rotates and moves up and down. The second reinforcing base 105 has a flange formed on its left end and is attached by welding to the inner surface of the left height side frame 21L at its upper end, preventing the second reinforcing base 105 from interfering with the left front height link 22L even when the left front height link 22L rotates and moves up and down.

[0076] In this embodiment, the front portions of the height side frames 21 are bent inward, and the width of the front portions of the height frame 20 is narrowed. By narrowing the width of the front portions of the height frame 20, interference between the front height links 22 and the height frame 20 in the seat width direction is suppressed. However, this is just one example, and the front portions of the height side frames 21 do not have to be bent inward, and the width of the front portions of the height frame 20 does not have to be narrowed.

[0077] <Cover member 110> 1, 9, and 11, the vehicle seat S is provided with a cover member 110 that covers the height frame 20. The cover member 110 covers the height frame 20 even when the cushion main body 1h is in an upright position with the cushion main body 1h flipped up, improving the appearance.

[0078] The cover member 110 is a resin cover, and as shown in FIG. 9, is composed of side cover portions 111 that cover both sides of the height frame 20, and a central cover portion 112 that is sandwiched between the side cover portions 111 and covers the front height frame member 24 and the front connecting shaft 27a (connecting frame). The side cover portions 111 are composed of a right side cover portion 111R that covers the right height side frame 21R and a left side cover portion 111L that covers the left height side frame 21L. As shown in FIG. 11 , each of the side cover portions 111 is disposed inwardly of the cushion side frame 11. Furthermore, the side cover portions 111 are disposed outwardly of the outer ends of the front connecting brackets 43 attached to the slide rail device 6, and the side cover portions 111, 111 are disposed compactly. Furthermore, even when the vehicle seat S is in the normal state or the folded state, the side cover portions 111, 111 are prevented from interfering with the cushion side frames 11 and the front connecting brackets 43.

[0079] The central cover part 112 is provided with a central cover attachment part 115 consisting of a flange part extending downward from the bottom surface. The central cover part 112 can be attached to the height frame 20 by clamping the upper end of the extension part 21b of the height side frame 21 with the flange part of the central cover attachment part 115. Furthermore, the bottom of the central cover portion 112 may be fixed to the side of the height frame 20 or the holding member support portion 103 using fastening members such as bolts. Furthermore, when the height side frame 21 does not have the bent portion 21a, the center cover portion 112 may be attached by sandwiching the tip end portion of the height side frame 21 with the center cover attachment portion 115.

[0080] 14 and 15, the central cover part 112 has a guide shape for guiding the detachable leg part 16 to the leg holding part 100. Specifically, it has a leg accommodating recess 116 that accommodates the detachable leg part 16, and a leg movement restricting part 113 that restricts the detachable leg part 16 from moving rearward beyond the leg accommodating recess 116.

[0081] The leg accommodating recess 116 is a generally U-shaped recess recessed downward from approximately the center of the upper surface of the central cover part 112, and is positioned with its opening facing diagonally upward and forward. Square-shaped openings 114a are formed in the front and rear side walls of the leg accommodating recess 116, and part of the leg holding part 100 is exposed to the outside from the back surface side of the central cover part 112 through the openings 114a, as shown in FIG. In addition, an opening 114b extending vertically is formed in the rear side wall of the leg accommodating recess 116, and a portion of the inertial leg locking part 101 is exposed to the outside through the opening 114b from the back side of the central cover part 112.

[0082] The leg movement restricting portion 113 is made up of a portion that protrudes from approximately the center of the upper surface of the central cover portion 112 toward the front of the seat, and is formed continuously from the rear portion of the leg accommodating recess 116. When the detachable leg portion 16 is stored in the leg accommodating recess 116, the leg movement restricting portion 113 restricts the rear movement of the detachable leg portion 16 and can guide the detachable leg portion 16 toward the leg accommodating recess 116. In addition, by providing a leg movement restricting portion 113 on the central cover portion 112, the movement of the detachable leg portion 16 is restricted, and the movement of the detachable leg portion 16 is more firmly suppressed when the cushion main body portion 1h and the seat back 2 are raised and lowered by the lifting mechanism LM. In this embodiment, the mounting positions of the central cover portion 112 and the side cover portions 111 overlap as shown in FIG. 11, but the mounting positions may be configured not to overlap.

[0083] 13, the cover member 110 is configured so that its upper end is located lower than the upper end of the cushion frame Cf when the vehicle seat S is in the reclined state. By configuring the upper end of the cover member 110 to be located lower than the cushion frame Cf including the rear cushion side frames 12, etc., the vehicle seat S can be made thinner in the reclined state.

[0084] <Modifications of the inertial leg locking portion 101> In this embodiment, one inertial leg locking unit 101 is provided near the leg holding unit 100, but multiple inertial leg locking units 101 may be provided. For example, the inertial leg locking units 101 may be attached to the inner surfaces of the left height side frame 21L and the right height side frame 21R. When the detachable leg 16 is held by the leg holding unit 100, the inertial leg locking units 101 provided on each height side frame 21 lock the detachable leg 16. In this case, the spring hook 101d that hooks the biasing spring 101e of the inertial leg locking unit 101 may be attached to the inner side of each height side frame 21.

[0085] In this embodiment, the height frame 20 is provided with the leg holding unit 100 and the inertial leg lock unit 101. This is just one example, and instead of the leg holding unit 100 and the inertial leg lock unit 101, a locking mechanism may be provided on the detachable leg unit 16 side, and the front height frame member 24 or the front connecting shaft 27a of the height frame 20 may be fixed as a striker.

[0086] <Lifting movable part 7> As shown in FIG. 8, in the vehicle seat S of this embodiment, a lifting and lowering movable portion 7 that assists the lifting and lowering operation is provided on the rear connecting shaft 27b.

[0087] The lifting movable portion 7 is arranged along the circumferential direction of the rear connecting shaft 27b and is composed of a biasing spring 70 that assists the rotational movement of the pair of rear height links 23, and a lifting regulation portion 71 that regulates the lifting and lowering of the seat cushion 1. Although the biasing spring 70 is provided at both ends of the rear connecting shaft 27b, this is just one example, and the biasing spring 70 may be provided at either end of the rear connecting shaft 27b. The biasing spring 70 is formed as a spiral spring. An inner end locking portion that locks the inner end of the biasing spring 70 is formed on the rear connecting shaft 27b. Further, the height side frame 21 is provided with a stopper portion 75 that engages the outer end of the biasing spring 70 .

[0088] <Reverse rotation suppression device 50> The vehicle seat S of this embodiment is provided with a reverse rotation suppression device 50, as shown in Fig. 3. The reverse rotation suppression device 50 is a device that suppresses the front height link 22 from rotating in the reverse direction when the seat cushion 1 is raised from its lowest position. For example, as shown in Fig. 3, the reverse rotation suppression device 50 is provided below the front height link 22 when the seat cushion 1 is in its lowest position (height-down position). By providing the reverse rotation suppression device 50, reverse rotation of the front height link 22 during ascent can be suppressed.

[0089] <Rail installation member 200 and first locking portion 210> The following describes the wiring member 200 and the first locking portion 210 with reference to the drawings. FIG. 17 is a side view showing the first locking portion 210 in a normal state, and FIG. 18 is a side view showing the first locking portion 210 in a tip-up state. FIG. 19 is a side view showing the first locking portion 210 in a reclining state. FIG. 20 is an enlarged top view showing the periphery of the first locking portion 210. FIGS. 21 to 23 are views showing the wiring state of the wiring member 200. FIGS. 24 to 28 are views showing modified examples of the wiring state of the wiring member 200. Note that the first locking portion 210 is usually covered by a first locking portion cover 211 as shown in FIG. 1 and is configured to be invisible from the outside. FIGS. 17 to 28 show a state in which the first locking portion cover 211 is removed to explain the first locking portion 210.

[0090] As shown in FIG. 17, the first locking portion 210 is a member provided on the left rear cushion side frame 12L, and is configured to lock the position of the cushion main body 1h when the cushion main body 1h is in an upright state. The cushion main body frame 10 is provided with a wiring member 200 that displaces the locking position of the first locking portion 210. The wiring member 200 has a wire connecting portion 202 that is connected to the first locking portion 210. A wiring member fixing portion 204 that fixes an end of the wiring member 200 is provided on the rear cushion side frame 12. The wire connecting portion 202 corresponds to a connecting portion.

[0091] The first locking portion 210 is provided with a rotating shaft bracket 212 that is fixed to the side connecting frame 32 of the back frame 30 around the flip-up rotating shaft 12b. One engagement groove 212a is formed in the rotating shaft bracket 212. A base portion of a locking bracket 213 that engages with the engagement groove 212a is rotatably attached to the rear cushion side frame 12 by a rotating shaft 213a. A window hole 213b is formed in the locking bracket 213, and a cut and raised engaging body 214a formed by cutting and raising at one end of an operating arm 214 is engaged with the window hole 213b, and the middle portion of the operating arm 214 is pivotally supported on the rear cushion side frame 12 by the rotating shaft 214b. A wire connecting portion 202 of a wire 201 extending from the wiring member 200 is engaged with the other end of the operating arm 214. 21 and 22, the other end of the wiring member 200 is connected to the detachable leg 16 via a wire mounting bracket 46. The wire 201 is pulled by the rotation of the detachable leg 16 about the leg rotation shaft 16c.

[0092] One end of a biasing spring 215 is attached to the operating arm 214 so as to rotate in the locking direction. The other end of the biasing spring 215 is engaged with a stay 216. As shown in Fig. 18, the biasing spring 215 is configured so that a lock piece 213d of the lock bracket 213 engages with the engagement groove 212a when the cushion main body 1h is raised. An elastically deformable abutting member 217 is provided on a peripheral edge 213c of the lock bracket 213 so as to always abut against the lock bracket 213 and bias the lock bracket 213 to rotate in the locking direction.

[0093] 17, when the vehicle seat S is in the normal state, the locking piece 213d of the lock bracket 213 is disengaged from the engagement groove 212a, and a gap is formed between the window hole 213b and the cut and raised engagement body 214a of the operating arm 214, thereby suppressing locking. In addition, by bringing the elastically deformable abutment member 217 into contact with the periphery 213c of the lock bracket 213 and biasing it so that it rotates in the locking direction, the inner periphery of the window hole 213b is constantly in contact with the cut and raised engagement body 214a of the operating arm 214. This suppresses rattle of the locking piece 213d.

[0094] As shown in FIG. 18, when the cushion body 1h is flipped up, the lock piece 213d of the lock bracket 213 rotates and engages with the engagement groove 212a, locking the position of the cushion body 1h. When returning from the upright state to the normal state, the detachable leg 16 is raised and the wire 201 of the wiring member 200 is pulled, thereby disengaging the lock piece 213d of the lock bracket 213 from the engagement groove 212a, thereby releasing the lock.

[0095] In this embodiment, the wiring member 200 includes a wire 201 and a wire protection portion 203 that protects the wire 201. A wire connection portion 202 that connects to a first lock portion 210 is provided at the tip of the wire 201. The rear cushion side frame 12 is provided with a wiring member fixing portion 204 formed by cutting and raising the side portion, and the end of the wire protection portion 203 of the wiring member 200 is fixed by the wiring member fixing portion 204.

[0096] When the seat back 2 of the vehicle seat S is reclined, the cushion side frame 11 is bent at the center-folding pivot shaft 12a, and the rear cushion side frame 12 is pivoted downward relative to the front cushion side frame 13, as shown in FIG. Since the wiring member fixing portion 204 for fixing the wiring member 200 is provided on the rear cushion side frame 12, even if the cushion side frame 11 is deformed, the direction and angle of extension of the wire 201 near the first locking portion 210 do not change, and breakage of the wire 201 is suppressed.

[0097] To explain in more detail, if the wiring member fixing portion 204 is provided on the side of the front cushion side frame 13, when the cushion side frame 11 is deformed as shown in Figure 19, the bending angle of the wire 201 at the end of the wire protection portion 203 may exceed the allowable range. By fixing the end of the wire protection portion 203 to the wiring member fixing portion 204 provided on the rear cushion side frame 12, even if the cushion side frame 11 is deformed, the wire 201 is less likely to bend at the end of the wire protection portion 203. In other words, since the wire 201 is less likely to bend at the end of the wire protection portion 203 beyond the allowable bending angle range of the wire 201, breakage of the wire 201 is suppressed.

[0098] 20, the wiring member fixing portion 204 is provided between the side rotation restricting member 12d and the stopper 12c in the seat front-rear direction. The wiring member fixing portion 204 is provided by cutting and raising the side surface of the rear cushion side frame 12, and therefore has a relatively low rigidity. By arranging the wiring member fixing portion 204 so as to avoid the stopper 12c and the like to which force is likely to be applied in the vertical direction, the rigidity of the entire cushion side frame 11 can be maintained.

[0099] Further, the rear cushion side frame 12 is provided with a first routing member holding portion 205 that holds the routing member 200 in the extending direction of the wire protection portion 203. As shown in Fig. 17, the first routing member holding portion 205 is located lower than the center-folding pivot shaft 12a in the seat up-down direction when the vehicle seat S is in the normal state. Therefore, as shown in Fig. 19, even if the cushion side frame 11 is deformed, the routing member 200 bends gently, and breakage of the wire 201 is suppressed.

[0100] 17, the first routing member holding portion 205 is located in front of the seat with respect to the center folding pivot shaft 12a when the vehicle seat S is in a normal state. In addition, a second routing member holding portion 206 is located in front of the seat with respect to the first routing member holding portion 205 in the extending direction of the wire protection portion 203, and is located in the front cushion side frame 13, more specifically, in the frame bending portion 13b of the front cushion side frame 13. Therefore, even if the cushion side frame 11 is deformed, the wiring member 200 is prevented from being pinched between the rear cushion side frame 12 and the front cushion side frame 13. In particular, by arranging the second wiring member holding portion 206 at the frame bending portion 13b, the wiring member 200 can be kept away from the center bending pivot shaft 12a as shown in Fig. 20 , and therefore, even if the cushion side frame 11 is deformed, for example, the wiring member 200 is prevented from being pinched between the rear cushion side frame 12 and the front cushion side frame 13.

[0101] 21 and 22, in the left front cushion side frame 13L, the third routing member holding portion 207 is directed toward the seat front side of the second routing member holding portion 206. Also, as shown in FIG. 21, the routing member 200 passes through a through-hole provided in the front of the left front cushion side frame 13L and is coupled to the leg mounting bracket 45. The detachable leg portion 16 is attached to the leg mounting bracket 45 so as to be rotatable about the leg rotation shaft 16c. When the detachable leg portion 16 rotates, the wire 201 of the routing member 200 is pulled, thereby unlocking the first locking portion 210.

[0102] <Modification of the wiring member fixing portion 204> The position of the wiring member fixing portion 204 is not limited to between the center-bending pivot shaft 12a and the first lock portion 210 as shown in Fig. 17. As shown in Fig. 25, the wiring member fixing portion 204A may be provided on the center-bending pivot shaft 12a. By providing the wiring member fixing portion 204A on the center-bending pivot shaft 12a, the wiring member fixing portion 204A is fixed to the side surface of the rear cushion side frame 12 so as to be rotatable about an axis extending in the vertical direction. At this time, the second wiring member holding portion 206A that holds the wiring member 200 may be disposed in the frame bending portion 13b of the front cushion side frame 13. Since the wiring member fixing portion 204A rotates, even if the cushion side frame 11 is deformed, the orientation of the wiring member 200 is changed in accordance with the deformation as shown in FIG. 26 , and bending of the wiring member 200 and the wire 201 is suppressed.

[0103] 27, a rotation function may be provided in the wiring member fixing portion 204B. Furthermore, a first wiring member holding portion 205B and a second wiring member holding portion 206B that hold the wiring member 200 may be provided with a rotation function. 29 , by making the wiring member fixing portion 204B, the first wiring member holding portion 205B, and the second wiring member holding portion 206B rotatable, the holding direction can be changed in accordance with the movement of the wiring member 200 due to the deformation of the cushion side frame 11. Therefore, bending of the wiring member 200 and the wire 201 is suppressed.

[0104] <Second locking portion 220> The second locking portion 220 will be described with reference to Figure 29. Figure 29 is a side view showing the second locking portion 220. The vehicle seat S of this embodiment is provided with the second locking portion 220 that locks the deformation of the cushion side frame 11. More specifically, the second locking portion 220 is provided on the right rear cushion side frame 12R, and is configured to lock the rotation of the rear cushion side frame 12 and the front cushion side frame 13. Normally, the second locking portion 220 is covered with a second locking portion cover 221 (see Figure 1).

[0105] The second locking portion 220 has a similar configuration to the first locking portion 210, but differs in that the first locking portion 210 restricts the rotation of the flip-up pivot shaft 12b, whereas the second locking portion 220 restricts the rotation of the folding pivot shaft 12a.

[0106] The second locking portion 220 includes a rotating shaft bracket 222 fixed to the right front cushion side frame 13R around the folding rotating shaft 12a. The rotating shaft bracket 222 is formed with an engagement groove 222a. The base of a locking bracket 223 that engages with the engagement groove 222a is rotatably attached to the right rear cushion side frame 12R by a rotating shaft 223a. A window hole 223b is formed in the locking bracket 223, and a cut and raised engaging body 224a formed by cutting and raising at one end of an operating arm 224 is engaged with the window hole 223b. The middle portion of the operating arm 224 is pivotally supported on the right rear cushion side frame 12R by the rotating shaft 224b. A claw portion of an unlocking bracket 229 abuts against the other end of the operating arm 224.

[0107] One end of a biasing spring 225 is attached to the operating arm 224 so as to rotate in the locking direction. The other end of the biasing spring 225 is engaged with a stay 226. As shown in Fig. 29, the biasing spring 225 is configured so that a lock piece 223d of the lock bracket 223 engages with the engagement groove 222a. An elastically deformable abutting member 227 is provided on a peripheral edge 223c of the lock bracket 223 so as to always abut against the lock bracket 223 and bias the lock bracket 223 to rotate in the locking direction.

[0108] 29, in a normal state, the second locking portion 220 is locked to prevent the rear cushion side frame 12 from rotating relative to the front cushion side frame 13. The second locking portion 220 is configured to be unlocked by tilting the seat back 2 backward.

[0109] The first locking portion 210 is provided on the left rear cushion side frame 12L, and the second locking portion 220 is provided on the right rear cushion side frame 12R, so that the first locking portion 210 and the second locking portion 220 can be arranged compactly. The positions of the first locking portion 210 and the second locking portion 220 are not limited to this, and the first locking portion 210 may be provided on the right rear cushion side frame 12R, and the second locking portion 220 may be provided on the left rear cushion side frame 12L.

[0110] As an embodiment of the present invention, a vehicle seat S to be mounted in a vehicle has been described above, and an example of its configuration has been explained using the drawings. However, the present invention is not limited to seats mounted in ground-traveling vehicles with wheels such as automobiles and trains, and may also be applied to seats mounted in aircraft, ships, and other vehicles that move on non-ground surfaces, for example. [Explanation of symbols]

[0111] S Vehicle seat (vehicle seat) Front seat frame P pad material Tr skin material Sh seat body 1 seat cushion 1h Cushion body 2 seat backs 3 Headrest 5 Reclining device 6 Slide rail device 61 Lower rail 62 Upper Rail 63 Slide lock device 63a Lock operation lever 63b Spring member 64 wires 7. Lifting and lowering part 70 bias spring 71 Lifting control section 75 Stopper part 9. Seatbelts Cf Cushion Frame 10 Cushion main frame (first frame) 11 Cushion side frame 11R Right side cushion side frame 11L Left side cushion side frame 12 Rear cushion side frame (first side frame) 12R Right rear cushion side frame 12L Left rear cushion side frame 12a Center-folding pivot shaft (connecting pivot shaft) 12b Flip-up pivot shaft 12c stopper 12d Side rotation restriction member 13 Front cushion side frame (second side frame) 13R Right front cushion side frame 13L Left front cushion side frame 13a Rear of frame 13b Frame bend 13c Frame extension 14 Pan Frame 15 Cushion frame member CM tip-up mechanism 16 Detachable leg (first leg) 16a Script body part 16b Leg connection 16c Leg rotation axis 18 S spring (pressure-receiving member) 20 Height frame (second frame) 21 Height side frame (side frame) 21R Right side height side frame 21L Left side height side frame 21E Extended Height Side Frame 21Ea Connecting pipe 21a Bend part 21b Extension LM lifting mechanism HL Height Link (Second Leg) 22 Front height link (second leg) 22a First pivot shaft (rotation shaft of second leg) 22b Second rotation axis 22R Right front height link 22L left front height link 23 Rear height link (second leg) 23a First rotation axis 23b Second rotation axis 23R Right rear height link 23L Left rear height link 24 Front height frame member (connecting frame) 25 Mid-height frame member 26 Rear height frame member 27 Connecting shaft 27a Front connecting shaft (connecting frame) 27b Rear connecting shaft 28 Front height link member 29 Rear height link member 30 Back Frame 31 Backside Frame 32 Side connecting frame 33 Back upper frame 34 Back lower frame 35 Pressure Plate 36 Headrest frame 40 Reclining control lever 41 Slide rail operating lever 42 Height frame operating lever 43 Front connecting bracket 44 Rear connecting bracket 45 Leg mounting bracket 46 Wire mounting bracket 47 Operating lever mounting bracket 50 Reverse rotation suppression device 100 Leg holder 100a Side wall 100b Bottom wall 100c curl 101 Inertial leg lock (leg lock) 101a Upper grip part 101b Lower grip part 101c Lock pivot 101d Spring hook 101e bias spring 103 Holding member support part 104 First Reinforcement Base 105 Second Reinforcement Base 109 Wire 110 Cover member 111 Side cover part 111L Left side cover 111R Right side cover 112 Central cover part 113 Leg movement control part 114a opening 114b opening 115 Central cover mounting part 116 Leg storage recess 200 Wiring components 201 Wire 202 Wire connection part (connection part) 203 Wire protection part 204, 204A, 204B Wiring member fixing portion 205, 205B First wiring member holding portion 206, 206A, 206B Second routing member holding part 207 Third arrangement member holding part 210 First lock 211 First lock cover 212 Rotating axis bracket 212a Engagement groove 213 Lock Bracket 213a Rotation axis 213b Window hole 213c Periphery 213d Lock piece 214 Operating Arm 214a Cut and raised engagement body 214b Rotation axis 215 bias spring 216 Stay 217 Elastically deformable contact member 220 Second locking part 221 Second lock cover 222 Rotating axis bracket 222a Engagement groove 223 Lock Bracket 223a Rotation axis 223b Window hole 223c Periphery 224 Operating Arm 224a Cut and raised engagement body 224b Rotation axis 225 bias spring 226 Stay 227 Elastically deformable contact member 229 Unlocking Bracket

Claims

1. a seat cushion having a cushion main body; Seat back and a tip-up mechanism that flips up the cushion main body, the cushion main body is rotatably attached to the seat back and is displaceable between a normal state in which an occupant can be seated and an upright state in which the cushion main body is uprighted by the tip-up mechanism so as to be parallel to the seat back, The cushion main body is configured to be able to lock the position of the cushion main body in the upright state, The vehicle seat is characterized in that the seat cushion includes a lifting mechanism that moves the cushion body and the seat back up and down.

2. The seat cushion has a cushion frame that forms a skeleton of the seat cushion, The cushion frame is a first frame forming a skeleton of the cushion main body; a second frame provided below the first frame and supporting the first frame, the first frame has a first leg portion connected to the second frame and supporting a front side of the cushion main body portion; the second frame has a second leg portion rotatably provided as the lifting mechanism, 2. The vehicle seat according to claim 1, wherein the first leg portion has an upper end attached to the first frame and a lower end detachably attached to the second frame.

3. The second frame is A pair of side frames arranged on both sides in the seat width direction; a connecting frame that spans the pair of side frames; 3. The vehicle seat according to claim 2, further comprising a leg holding portion provided on the connecting frame for detachably fixing a lower end of the first leg portion.

4. The connecting frame has a leg lock portion that fixes a lower end side of the first leg portion, 4. The vehicle seat according to claim 3, wherein the leg holding portion and the leg lock portion are disposed inward of an outer end portion of the second frame in the seat width direction.

5. The vehicle seat according to claim 4, wherein the connecting frame is connected to a rotation shaft of the second leg portion.

6. The vehicle seat according to claim 3, further comprising a cover member for covering the second frame.

7. Each of the pair of side frames has a bent portion that bends inward in the seat width direction and an extending portion that extends from the bent portion toward the front of the seat, The vehicle seat according to claim 6, wherein the cover member is fixed to the extension portion.

8. The cover member has a side cover portion that covers a side portion of the second frame and a central cover portion that covers the connecting frame, The vehicle seat according to claim 7, wherein a leg movement restricting portion that restricts movement of the first leg portion is provided on the central cover portion.

9. a slide rail device that moves the seat cushion and the seat back in the front-rear direction of the seat; a connecting bracket that rotatably fixes the second leg portion to the slide rail device, The seat back is connected to the seat cushion and is configured to be foldable toward the seat cushion, The seat cushion is displaceable into a collapsed state in which the cushion main body collapses forward, the first leg portion is configured to be rotatable so as to cause the cushion main body portion to collapse forward in conjunction with an operation of folding the seat back toward the seat cushion, 9. The vehicle seat according to claim 8, wherein in the reclined state, the side cover portion of the cover member is positioned outward from the outer end of the connecting bracket and inward from the first frame in the seat width direction.

10. 10. The vehicle seat according to claim 9, wherein the cover member is configured such that, in the reclined state, an upper end of the cover member is positioned lower than an upper end of the cushion frame.

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