Vehicular seat

Abstract

To provide a vehicular seat that is excellent in usability of a floor from which a seat main body is flipped up.SOLUTION: A vehicular seat 10 comprises a seat main body 11, and a seat supporting part 20 that supports the seat main body 11 in a pushed-forward state P2 so that the seat main body can be flipped up into a flipped-up state. The seat supporting part 20 comprises a floor-side member 21, a link arm guide 22, a first link arm 24 and a second link arm 25, which is configured to change a posture of the seat main body 11 from the pushed-forward state into the flipped-up state, utilizing link motion of turning the first link arm 24 and the second link arm 25 around a first shaft part 21a of the floor-side member 21 so that a part 25c to be guided of the second link arm 25 approaches a second shaft part 22a of the link arm guide 22.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat. [Background technology]

[0002] Conventional vehicles employ a structure that flips up vehicle seats into a sideways position to maximize the use of vehicle interior space. For example, Patent Document 1 below discloses a conventional vehicle seat. This vehicle seat is equipped with a sideways flip-up mechanism that can flip up the seat body into a sideways position when the seat back is tilted forward relative to the seat cushion. The sideways flip-up mechanism has a pair of left and right links, each of whose ends is connected to an installation member and the seat cushion member so as to be rotatable about an axis in the front-to-rear direction of the seat, and this pair of left and right links is connected to a connecting bracket fixed to the underside of the installation member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-24435 Summary of the Invention [Problem to be solved by the invention]

[0004] In the vehicle seat having the above-described configuration, the side-lifting mechanism is attached to a bridge member that spans between a pair of slide rails. The bridge member is fixed to the left and right upper rails on the floor side and remains on the floor side even after the seat body is lifted to a sideways position. However, because it is a long member that extends left and right, it can get in the way when the floor is subsequently used more widely in the vehicle width direction. This can prevent the seat body from being lifted to use the vehicle interior space more widely.

[0005] The present invention has been made in view of the above-mentioned problems, and aims to provide a vehicle seat that has excellent usability of the floor after the seat body is flipped up. [Means for solving the problem]

[0006] One aspect of the present invention is a seat body having a seat cushion portion and a seat back portion; a seat support portion that supports the seat body in a forward-folded state in which the seat back portion is folded forward relative to the seat cushion portion so as to be able to be flipped up into a flipped-up state; Equipped with The seat support portion is a floor side member having a first axle portion extending in the vehicle length direction; a link arm guide that is integral with the seat cushion and has a second shaft that extends in the vehicle length direction; a first link arm having a lower end portion rotatably connected to the floor side member about the first shaft portion and an upper end portion rotatably connected to the link arm guide about the second shaft portion; a second link arm whose lower end is connected to the floor side member so as to be rotatable about the first shaft portion and whose upper end has a guided portion that is guided by the link arm guide; Equipped with a vehicle seat configured to change the position of the seat body from the forward-tilted state to the flip-up state by utilizing a link action that rotates at least one of the first link arm and the second link arm about the first shaft portion so that the guided portion approaches the second shaft portion; is located. [Effects of the Invention]

[0007] The seat support portion of the vehicle seat of the above aspect has a function of supporting the seat body in a forward-folded state in which the seat back portion is folded forward relative to the seat cushion portion so that the seat body can be flipped up to a flip-up state. In this seat support portion, the link arm guide is integral with the seat cushion portion of the seat body. The first link arm has a lower end that is rotatable around a first shaft portion of the floor-side member and an upper end that is rotatable around a second shaft portion of the link arm guide. The second link arm has a lower end that is rotatable around the first shaft portion of the floor-side member and a guided portion of the upper end that is guided by the link arm guide. In this seat support portion, the position of the seat body is changed from the forward-folded state to the flip-up state by using a link action that rotates at least one of the first link arm and the second link arm around the first shaft portion so that the guided portion of the second link arm approaches the second shaft portion.

[0008] With this vehicle seat configuration, the lower ends of the first link arm and the second link arm can be commonly connected to a first axle extending in the vehicle length direction on the floor-side member. Therefore, after the seat body is changed from the forward-folded position to the flip-up position, only the floor-side member remains on the floor. Furthermore, because the floor-side member only needs to include the first axle extending in the vehicle length direction, the area of ​​the floor that this floor-side member occupies in the vehicle width direction can be minimized. Therefore, it is possible to ensure effective use of space when it is desired to use the floor more widely in the vehicle width direction after the seat body is changed from the forward-folded position to the flip-up position.

[0009] As described above, according to the above-described aspect, it is possible to provide a vehicle seat that has excellent usability of the floor after the seat body is flipped up. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view showing a seat arrangement structure in a vehicle. [Figure 2]1 is a front view of the vehicle seat of the first embodiment with the seat body in a forward-folded state, as viewed from the front of the vehicle. FIG. [Figure 3] 3 is a perspective view of the seat support portion of the vehicle seat of FIG. 2, seen from diagonally above the front. [Figure 4] 4 is a front view of the link mechanism of the seat support portion of FIG. 3, as viewed from the front of the vehicle. [Figure 5] 1 is a front view of the vehicle seat of the first embodiment, with the seat body in a flipped-up state, as viewed from the front of the vehicle. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] In the vehicle seat of the above-mentioned aspect, it is preferable that the seat support portion is configured so that, when the seat body is in the forward-tilted state and viewed from the vehicle height direction, the first axis portion of the floor side member is positioned between the second axis portion of the link arm guide and the guided portion of the second link arm.

[0012] According to this vehicle seat, by employing a seat support part with a structure in which the first shaft is disposed between the second shaft and the guided part, the rigidity of the seat support part against the downward load received from the seat body can be increased, thereby improving the support stability of the seat support part against the seat body in normal use or in a forward-folded position.

[0013] In the vehicle seat of the above-described aspect, it is preferable that the seat support portion includes a first biasing member that biases at least one of the first link arm and the link arm guide in a rotational direction that brings them closer to each other around the second axis portion, and a locking mechanism that releasably locks the seat body in the forward-folded state to the floor.

[0014] With this vehicle seat, when the seat body in the forward-folded state is unlocked by the locking mechanism, the seat body rotates around the second shaft in accordance with the biasing force of the first biasing member so that the first link arm and the link arm guide approach each other. Accordingly, the first link arm and the second link arm rotate around the first shaft so that the guided portion approaches the second shaft, making it easy to change the position of the seat body from the forward-folded state to the flipped-up state.

[0015] In the vehicle seat of the above aspect, it is preferable that the seat support portion includes a second biasing member that biases at least one of the first link arm and the second link arm in a rotational direction that brings them closer to each other around the first shaft portion.

[0016] With this vehicle seat, when the seat body is in the forward-folded state, the locking mechanism is released, and the first link arm and the second link arm rotate about the first shaft in accordance with the biasing force of the second biasing member so as to move closer to each other. At this time, the cooperation of the first biasing member and the second biasing member can enhance the effect of changing the position of the seat body from the forward-folded state to the flipped-up state.

[0017] In the vehicle seat of the above-described aspect, it is preferable that the floor is provided with an outer seat rail and an inner seat rail extending parallel to each other in the vehicle length direction, the floor side member is attached to the outer seat rail, and the seat support portion is provided with a seat leg having a connecting shaft portion connected to the seat cushion portion of the seat body and an attached shaft portion attached to the inner seat rail via the locking mechanism portion.

[0018] This vehicle seat employs a structure in which the floor side member of the seat support part is attached to the outer seat rail, and the seat legs of the seat support part are lockably attached to the inner seat rail via a locking mechanism, making it possible to release the lock on the seat legs by the locking mechanism at any position in the vehicle length direction, thereby changing the position of the seat body from a forward-leaning position to a flipped-up position.

[0019] In the vehicle seat of the above-described aspect, the link arm guide has a guide groove with which the guided portion of the second link arm engages, and it is preferable that the guide groove extends along the vehicle width direction on the outer side of the vehicle than the second axle portion when the seat body is in the forward-leaning state, and that the outer groove end is arranged so as to be bent.

[0020] With this vehicle seat, when the seat body is set to the normal use state or the forward tilted state, the guided portion of the second link arm is less likely to come off the outer groove end of the guide groove, which in this case can enhance the effect of suppressing rattle of the seat body in the vehicle width direction when in the normal use state or the forward tilted state, and also realizes a lateral load-resistant structure that is resistant to lateral loads acting on the seat body from the vehicle width direction.

[0021] Hereinafter, specific embodiments of the vehicle seat of the above aspect will be described with reference to the drawings.

[0022] In the drawings referred to in the following description, the front of the vehicle is indicated by an arrow FR, the upper side of the vehicle is indicated by an arrow UP, the right side of the vehicle is indicated by an arrow RH, and the left side of the vehicle is indicated by an arrow LH. Furthermore, unless otherwise specified, the vehicle width direction (left-right direction) is indicated by an arrow X, the vehicle height direction (up-down direction) is indicated by an arrow Y, and the vehicle length direction (front-rear direction) is indicated by an arrow Z.

[0023] (Embodiment 1) 1. Seat arrangement structure of vehicle 1 As shown in Fig. 1, a vehicle 1 according to the first embodiment has a seat arrangement structure with two rows arranged on a floor 2. That is, the vehicle 1 includes a pair of left and right vehicle seats 3 that are front seats in the first row, and a pair of left and right vehicle seats 10 that are rear seats in the second row arranged behind the vehicle seats 3 in the vehicle length direction Z. Both of the vehicle seats 3 and 10 are of a type that have headrests.

[0024] On the floor 2 of the vehicle 1, outer seat rails 4 and inner seat rails 5 extending parallel to each other in the vehicle length direction Z are provided for each vehicle seat 10. Therefore, each vehicle seat 10 can slide along the seat rails 4, 5. Furthermore, although details will be described later, the seat body of each vehicle seat 10 is configured to be able to change its position from a normal use state (state indicated by a solid line) in which an occupant can be seated, through a forward-leaning state described later, to a flipped-up state (state indicated by a two-dot chain line).

[0025] The "flip-up state" here refers to a state in which the seat body is flipped up to the side outside the vehicle. In this flip-up state, the seat body of each vehicle seat 10 is laid down and stored in the storage space 7. The storage space 7 is a dead space formed in front of the protrusion 6 of the rear wheel house (a portion known as the "quarter trim").

[0026] If the storage space 7 is used as a space for arranging the seat bodies in the flip-up state, the amount of space that can be effectively used within the vehicle interior can be expanded compared to the conventional structure (a structure that simply flips up). As a result, the vehicle interior space can be used to the maximum extent in all directions: the vehicle width direction X, the vehicle height direction Y, and the vehicle length direction Z. In addition, the structure in which the seat bodies of each vehicle seat 10, which is a rear seat, are stored in the storage space 7 is effective in preventing interference with the sliding movement of the front seat (vehicle seat 3) in the vehicle length direction Z. This makes it possible to maintain the front seat in a comfortable position without being affected by the rear seat.

[0027] The seat arrangement in the vehicle 1 is merely illustrative and is not limited to that shown in FIG. 1. For example, the rear seats may be arranged in two or more rows. The structure and shape of each vehicle seat may be appropriately changed from that shown in FIG. 1. For example, the rear seats may be changed to high-back type seats without headrests.

[0028] 2. Floor 2 Structure 2, the outer seat rail 4 has a lower rail portion 4a with a concave cross section that is embedded in the floor 2 so as to extend in the vehicle length direction Z, and an upper rail portion 4b that is supported by the lower rail portion 4a so as to be slidable in the vehicle length direction Z. A floor side member 21, which will be described later, is attached to the upper rail portion 4b.

[0029] Like the outer seat rail 4, the inner seat rail 5 has a lower rail portion 5a with a concave cross section that is embedded in the floor 2 so as to extend in the vehicle length direction Z, and an upper rail portion 5b that is supported by the lower rail portion 5a so as to be slidable in the vehicle length direction Z. A locking mechanism portion 29, which will be described later, is built into the upper rail portion 5b.

[0030] A locking member 8 is also provided on the floor 2. The locking member 8 is for locking the seat body of the vehicle seat 10 in the flipped-up state when the seat body is changed in position to the flipped-up state. The locking member 8 protrudes from the floor 2 and is elastically biased upward by an elastic member.

[0031] 3. Structure of the vehicle seat 10 As shown in Fig. 2, a vehicle seat 10 (hereinafter simply referred to as "seat 10") includes a seat body 11 and a seat support portion 20. In this embodiment, the pair of left and right seats 10 (see Fig. 1) have a symmetrical structure, so the following description will only cover the seat 10 on the left side of the vehicle, and a description of the seat 10 on the right side of the vehicle will be omitted.

[0032] 3-1. Structure of the seat body 11 As shown in FIG. 2, the seat body 11 has a seat cushion portion 12 on which an occupant can sit and a seat back portion 13 against which the occupant seated on the seat cushion portion 12 rests. A headrest 13a is provided on the seat back portion 13 at a position corresponding to the occupant's head. The seat body 11 can change its posture between at least three states. First, the seat body 11 is set to a normal use state P1 (see the state indicated by the two-dot chain line in FIG. 2) by raising the seat back portion 13 relative to the seat cushion portion 12. The seat body 11 is also set to a forward-folded state P2 by folding the seat back portion 13 forward relative to the seat cushion portion 12 from the normal use state P1. The seat body 11 is also set to a flipped-up state (see "flipped-up state P3" in FIG. 5) by flipping up from the forward-folded state P2 toward the outside of the vehicle.

[0033] The seat cushion portion 12 of the seat body 11 is provided with an unlocking lever 14 and a locked claw 15. The unlocking lever 14 is an operating lever that allows the user to perform an unlocking operation to release the locked state of the seat leg 28 by the locking mechanism portion 29. The locked claw 15 is configured to engage with the locking member 8 on the floor 2 side when the seat body 11 is set to the flip-up state P3.

[0034] The locking claw 15 comes into contact with the tip of the locking member 8 just before the seat body 11 is set to the flipped-up state P3, temporarily pushing the locking member 8 down from the initial position to the unlocked position against the biasing force of the elastic member. Thereafter, when the seat body 11 is set to the flipped-up state P3 and the locking claw 15 passes the locking member 8, the tip of the locking member 8 no longer comes into contact with the locking claw 15, and the locking member 8 returns to its initial position in accordance with the biasing force of the elastic member. As a result, any attempt to return the seat body 11 from the flipped-up state P3 to the forward-folded state P2 is prevented by the locking claw 15 getting caught on the locking member 8. This allows the seat body 11 to be maintained in the flipped-up state P3. Thereafter, by pushing the locking member 8 down from the initial position to the unlocked position to release the lock on the locking claw 15, the seat body 11 can be returned from the flipped-up state P3 to the forward-folded state P2.

[0035] The structure for holding the seat body 11 in the flipped-up state P3 is not limited to the one using the locking member 8 and the locked claw 15, but can be appropriately changed as needed.

[0036] 3-2. Structure of seat support part 20 The seat support section 20 shown in Fig. 2 has a function of supporting the seat body 11 in a forward-folded position P2 so that it can be flipped up to a flipped-up position P3 (see Fig. 5). The seat support section 20 attaches the seat cushion section 12 of the seat body 11 to the floor 2. The seat support section 20 includes, as its constituent elements, a floor-side member 21, a link arm guide 22, a first link arm 24, a second link arm 25, a first biasing member 26, a second biasing member 27, seat legs 28, and a locking mechanism section 29.

[0037] 2 and 3, the floor side member 21 has a first shaft portion 21a extending in the vehicle length direction Z. The floor side member 21 is fixed to an upper portion of the upper rail portion 4b of the outer seat rail 4.

[0038] 2 and 3, the link arm guide 22 has a second shaft portion 22a extending in the vehicle length direction Z. This link arm guide 22 is provided integrally with the seat cushion portion 12 of the seat main body 11. Specifically, the link arm guide 22 is fixed to a frame (not shown) of the seat cushion portion 12. Therefore, when the seat main body 11 is in the normal use position P1 and the forward-leaning position P2, the link arm guide 22 is set to the horizontal position Q1 similar to the seat cushion portion 12. On the other hand, when the seat main body 11 is in the flip-up position P3, the link arm guide 22 is set to the sideways position Q2 (see FIG. 5) similar to the seat cushion portion 12.

[0039] 2 and 3, the first link arm 24 is an arm member that extends vertically while being slightly inclined with respect to the vehicle height direction Y. The first link arm 24 has an arm lower end 24b (see FIG. 3) that is rotatably connected to the floor side member 21 about a first shaft 21a. The first link arm 24 also has an arm upper end 24a (see FIG. 3) that is rotatably connected to the link arm guide 22 about a second shaft 22a. The rotation of the first link arm 24 at this time is a movement on a plane defined by two directions, the vehicle width direction X and the vehicle height direction Y.

[0040] 2 to 4, the link arm guide 22 is provided with a guide groove 23 that extends along the vehicle width direction X on the outer side of the second shaft portion 22a when the seat body 11 is in the forward-folded state P2. A guided portion 25c of the second link arm 25 is slidably engaged with the guide groove 23 of the link arm guide 22.

[0041] 4, guide groove 23 is formed by central groove portion 23a extending linearly, outer groove end portion 23b bending and extending diagonally downward outward from the outer side of central groove portion 23a, and inner groove end portion 23c bending and extending diagonally downward inward from the inner side of central groove portion 23a. When seat body 11 changes position from forward-folded state P2 to flipped-up state P3, guided portion 25c of second link arm 25 slides along slide path L from first position R1 corresponding to outer groove end portion 23b of guide groove 23 to second position R2 corresponding to inner groove end portion 23c.

[0042] With the guide groove 23 having the above-described shape, once the guided portion 25c of the second link arm 25 is positioned at the outer groove end 23b (first position R1) of the guide groove 23 as the seat body 11 is set to the normal use position P1 or the forward-leaning position P2, movement of the guided portion 25c in the vehicle width direction X, which tends to slide from the outer groove end 23b toward the central groove portion 23a, is restricted. In this case, a holding force is generated that holds the guided portion 25c at the outer groove end 23b of the guide groove 23. Similarly, once the guided portion 25c of the second link arm 25 is positioned at the inner groove end 23c (second position R2) of the guide groove 23 as the seat body 11 is set to the flip-up position P3, movement of the guided portion 25c in the vehicle width direction X, which tends to slide from the inner groove end 23c toward the central groove portion 23a, is restricted. In this case, a holding force is generated that holds the guided portion 25c at the inner groove end 23c of the guide groove 23.

[0043] In particular, in this embodiment, the bending angle of the outer groove end 23b relative to the central groove portion 23a is larger than that of the inner groove end 23c. Therefore, when the seat body 11 is set in the normal use position P1 or the forward-leaning position P2 and the guided portion 25c of the second link arm 25 is positioned at the outer groove end 23b, the movement of the guided portion 25c in the vehicle width direction X is more effectively restricted than when the guided portion 25c is positioned at the inner groove end 23c. As a result, it is possible to enhance the effect of suppressing rattle in the vehicle width direction X of the seat body 11 in the normal use position P1 or the forward-leaning position P2, and also to realize a lateral load-resistant structure that is resistant to lateral loads acting on the seat body 11 from the vehicle width direction X.

[0044] The shape of the guide groove 23 is not limited to the above. For example, the inner groove end 23c may extend linearly along the extension line of the central groove 23a.

[0045] As shown in FIGS. 2 and 3, the second link arm 25 is an arm member that extends vertically at a slight incline with respect to the vehicle height direction Y. The second link arm 25 has its arm lower end 25b (see FIG. 3) rotatably connected to the floor-side member 21 around a first shaft 21a. The rotation of the second link arm 25 at this time is a movement on a plane defined by the two directions, the vehicle width direction X and the vehicle height direction Y, similar to the first link arm 24. Therefore, the first shaft 21a of the floor-side member 21 serves as a rotation shaft for the arm lower end 24b of the first link arm 24 and also as a rotation shaft for the arm lower end 25b of the second link arm 25. The first link arm 24 and the second link arm 25 are configured to be rotatable around the same first shaft 21a. The second link arm 25 has a guided portion 25c at its arm upper end 25a (see FIG. 3) that is guided by the link arm guide 22. In this embodiment, the guided portion 25c is a slide shaft portion extending in the vehicle length direction Z.

[0046] 2 and 4, the seat support part 20 is configured such that, when the seat main body 11 is in the forward-folded position P2 (see FIG. 2) as viewed from the vehicle height direction Y, the first shaft part 21a of the floor-side member 21 is located between the second shaft part 22a of the link arm guide 22 and the guided part 25c of the second link arm 25. The seat support part 20 configured in this manner has the advantage of having higher rigidity against a downward load from the seat main body 11 than, for example, a case in which the first shaft part 21a is located more inward in the vehicle width direction X than the second shaft part 22a or more outward in the vehicle width direction X than the guided part 25c. This improves the support stability of the seat support part 20 for the seat main body 11 in the normal use position P1 or in the forward-folded position P2.

[0047] 3 and 4, the first biasing member 26 is provided on the second shaft portion 22a, and the second biasing member 27 is provided on the first shaft portion 21a. In this embodiment, the first biasing member 26 and the second biasing member 27 are both torsion springs that can apply an elastic biasing force. However, spring members other than torsion springs may be used as needed.

[0048] The first biasing member 26 is configured to bias at least one of the first link arm 24 and the link arm guide 22 in a rotational direction that moves them closer to each other around the second shaft 22a. In this embodiment, the first biasing member 26 constantly elastically biases the link arm guide 22 in the first rotational direction D1 (see FIG. 4). As a result, when the seat body 11 in the forward-folded state P2 is unlocked by the locking mechanism 29, the first link arm 24 and the link arm guide 22 rotate around the second shaft 22a in accordance with the elastic biasing force of the first biasing member 26 so that they move closer to each other. Accordingly, the first link arm 24 and the second link arm 25 rotate around the first shaft 21a so that the guided portion 25c moves closer to the second shaft 22a, and the position of the seat body 11 can be easily changed from the forward-folded state P2 to the flipped-up state P3.

[0049] The second biasing member 27 is configured to bias at least one of the first link arm 24 and the second link arm 25 in a rotation direction that moves them closer to each other around the first shaft 21a. In this embodiment, the second biasing member 27 constantly elastically biases the first link arm 24 in the second rotation direction D2 (see FIG. 4). As a result, when the seat body 11 in the forward-folded state P2 is unlocked by the locking mechanism 29, the first link arm 24 and the second link arm 25 rotate around the first shaft 21a in accordance with the elastic biasing force of the second biasing member 27 so as to move them closer to each other. At this time, the cooperation of the first biasing member 26 and the second biasing member 27 can enhance the effect of changing the position of the seat body 11 from the forward-folded state P2 to the flipped-up state P3.

[0050] As described above, both the first biasing member 26 and the second biasing member 27 function to change the position of the seat body 11 from the forward-folded position P2 to the flipped-up position P3. This function can be used to automatically pop up the seat body 11 from the forward-folded position P2 to the flipped-up position P3. Alternatively, this function can be used to assist the user in performing the work required for this position change. This makes it possible to reduce the workload on the user when switching the position of the seat body 11 from the forward-folded position P2 to the flipped-up position P3.

[0051] 2, the seat legs 28 are support members extending vertically in the vehicle height direction Y. A connecting shaft 28c extending in the vehicle length direction Z is provided at an upper end 28a of the seat legs 28. The seat legs 28 are rotatably connected to the seat cushion 12 of the seat main body 11 at the connecting shaft 28c. Specifically, when the seat main body 11 is in the forward-folded position P2, the seat legs 28 are connected to a portion of the seat cushion 12 of the seat main body 11 that is closer to the vehicle interior than the link arm guide 22.

[0052] As shown in Fig. 3, the leg lower end 28b of the seat leg 28 is provided with a mounting shaft 28d extending in the vehicle length direction Z. The mounting shaft 28d is locked to the upper rail 5b of the inner seat rail 5 by the function of the locking mechanism 29. Alternatively, the mounting shaft 28d is unlocked from the upper rail 5b by an unlocking operation of the locking mechanism 29 using the lock release lever 14. In this way, the locking mechanism 29 is configured to releasably lock the seat body 11 in the forward-folded position to the floor 2.

[0053] The structure of the locking mechanism 29 is not particularly limited, but the locking mechanism 29 is configured to include, for example, an engaging member (not shown) that moves between a locked position and an unlocked position in conjunction with the unlocking lever 14. According to this locking mechanism 29, the engaging member engages with the attached shaft portion 28d at the locked position to lock the upward movement of the attached shaft portion 28d, and the engaging member disengages from the attached shaft portion 28d at the unlocked position to allow the upward movement of the attached shaft portion 28d.

[0054] 4. Operation of the seat support unit 20 Next, with reference to Figures 2, 4 and 5, we will explain the first operation of changing the position of the seat body 11 from the normal use state P1 to the flipped-up state P3, and the second operation of changing the position of the seat body 11 from the flipped-up state P3 to the normal use state P1.

[0055] 4-1. First movement (jumping up movement) The first operation is a lift-up operation of the seat body 11. As shown in FIG. 2 , first, before setting the seat body 11 to the lift-up position P3, the seat body 11 is changed in position from the normal use position P1 to the forward-folded position P2. With the seat body 11 in the normal use position P1, the seat back 13 is folded forward relative to the seat cushion 12. Then, the user operates the lock release lever 14 to release the seat legs 28 from the locked state by the lock mechanism 29. This separates the seat legs 28 from the inner seat rails 5.

[0056] 4, an elastic biasing force in a first rotation direction D1 is constantly applied to the link arm guide 22 by the first biasing member 26, and an elastic biasing force in a second rotation direction D2 is constantly applied to the first link arm 24 by the second biasing member 27. These elastic biasing forces are used to disengage the guided portion 25c of the second link arm 25 from the outer groove end portion 23b of the guide groove 23, and to rotate the link arm guide 22 about the second shaft portion 22a in the first rotation direction D1 and to rotate the first link arm 24 about the first shaft portion 21a in the second rotation direction D2, on the condition that the locked state of the seat leg 28 by the locking mechanism portion 29 is released.

[0057] As shown in Figure 5, the seat body 11 changes its position from the forward-folded state P2 to the flipped-up state P3 in response to the elastic biasing forces of the two biasing members 26, 27. When the seat body 11 reaches the flipped-up state P3, the locking claws 15 on the seat body 11 are hooked onto the locking members 8 on the floor 2, thereby maintaining the seat body 11 in the flipped-up state P3. This allows the storage space 7 to be used as a storage space for the seat body 11 in the flipped-up state P3. At this time, the seat legs 28 are rotated around the connecting shafts 28c by their own weight or by a separate drive mechanism and stored inside the seat cushion 12. This prevents the seat legs 28 from being exposed from the seat cushion 12, thereby reducing the available space.

[0058] 4-2. Second operation (return operation) The second operation is a return operation that is the reverse of the first operation. In FIG. 5 , first, the locking member 8 is pushed down to release the lock on the locked claw 15. This unlocking may be achieved by using an unlocking device (not shown) that automatically pushes down the locking member 8, or by the user manually pushing down the locking member 8. Then, as shown in FIG. 2 , the user pushes down the seat body 11 from the flip-up state P3 to the forward-folded state P2 against the elastic biasing forces of the two biasing members 26, 27. At this time, the seat legs 28 are locked to the upper rail portions 5b of the inner seat rails 5 by the function of the locking mechanism 29. Furthermore, with the seat body 11 in the forward-folded state P2, the seat back portion 13 is raised relative to the seat cushion portion 12. This allows the seat body 11 to return from the forward-folded state P2 to the normal use state P1.

[0059] 5. Effects Next, the effects of the above-described first embodiment will be described.

[0060] The seat support portion 20 of the seat 10 of the first embodiment has a function of supporting the seat body 11 in a forward-folded state P2 in which the seat back portion 13 is folded forward relative to the seat cushion portion 12 so that the seat body 11 can be flipped up to a flipped-up state P3.

[0061] In the seat support portion 20, the link arm guide 22 is integral with the seat cushion portion 12 of the seat main body 11. The first link arm 24 has an arm lower end portion 24b that is rotatable around the first shaft portion 21a of the floor side member 21, and an arm upper end portion 24a that is rotatable around the second shaft portion 22a of the link arm guide 22. The second link arm 25 has an arm lower end portion 25b that is rotatable around the first shaft portion 21a of the floor side member 21, and a guided portion 25c of the arm upper end portion 25a is guided by the link arm guide 22.

[0062] In this seat support portion 20, the position of the seat body 11 is changed from the forward-tilted state P2 to the flipped-up state P3 by utilizing a link action that rotates the first link arm 24 and the second link arm 25 around the first shaft portion 21a so that the guided portion 25c of the second link arm 25 approaches the second shaft portion 22a.

[0063] With the seat 10 configured as described above, the lower ends of the first link arm 24 and the second link arm 25 can be commonly connected to the first axle 21a extending in the vehicle length direction Z on the floor-side member 21. This allows the seat body 11 to be configured so that only the floor-side member 21 remains on the floor 2 after the position of the seat body 11 is changed from the forward-folded state P2 to the flipped-up state P3. Furthermore, because the floor-side member 21 only needs to include the first axle 21a extending in the vehicle length direction Z, the area of ​​the floor 2 that the floor-side member 21 occupies in the vehicle width direction X can be kept as small as possible. This makes it possible to ensure an effectively usable space when it is desired to use the floor 2 widely in the vehicle width direction X after the position of the seat body 11 is changed from the forward-folded state P2 to the flipped-up state P3.

[0064] Therefore, it is possible to provide the seat 10 which is excellent in usability for the floor 2 after the seat body 11 is flipped up.

[0065] With the seat 10 of this configuration, the floor side member 21 of the seat support portion 20 is attached to the outer seat rail 4, and the seat leg 28 of the seat support portion 20 is attached to the inner seat rail 5 in a lockable manner via a locking mechanism portion 29. This makes it possible to unlock the seat leg 28 by the locking mechanism portion 29 at any position in the vehicle length direction Z, thereby changing the position of the seat body 11 from the forward-tilted state P2 to the flipped-up state P3.

[0066] 6. Other forms The present invention is not limited to the exemplary embodiments described above, and various applications and modifications are possible without departing from the scope of the present invention. For example, the following embodiments can be implemented by applying the above embodiments.

[0067] In the above embodiment, the seat support portion 20 is provided with the seat legs 28 and the locking mechanism portion 29, but the seat legs 28 and the locking mechanism portion 29 may be omitted as necessary.

[0068] In the above embodiment, the seat support portion 20 is provided with the first biasing member 26 and the second biasing member 27, but instead, a structure may be adopted in which at least one of the first biasing member 26 and the second biasing member 27 is omitted. Also, instead of or in addition to the first biasing member 26 and the second biasing member 27, for example, an electric driving means may be used.

[0069] In the above embodiment, an example is given of the seat support part 20 applied to the structure of the seat 10, which is a rear seat, but if necessary, this seat support part 20 may also be applied to the structure of a front seat or the structure of another rear seat. [Explanation of symbols]

[0070] 4...Outer seat rail, 5...Inner seat rail, 10...Vehicle seat, 11...Seat body, 12...Seat cushion portion, 13...Seat back portion, 20...Seat support portion, 21...Floor side member, 21a...First shaft portion, 22...Link arm guide, 22a...Second shaft portion, 23...Guide groove, 23b...Outer groove end portion, 24...First link arm, 24a...Arm upper end portion, 24b...Arm lower end portion, 25...Second link arm, 25a...Arm upper end portion, 25b...Arm lower end portion, 25c...Guided portion, 26...First biasing member, 27...Second biasing member, 28...Seat leg, 28c...Connecting shaft portion, 28d...Mounted shaft portion, 29...Lock mechanism portion, D1, D2...Rotation direction, P2...Forward tilted state, P3...Upturned state, X...Vehicle width direction, Y...Vehicle height direction, Z...Vehicle length direction

Claims

1. a seat body having a seat cushion portion and a seat back portion; a seat support portion that supports the seat body in a forward-folded state in which the seat back portion is folded forward relative to the seat cushion portion so as to be able to be flipped up into a flipped-up state; Equipped with The seat support portion is a floor side member having a first shaft portion extending in the vehicle length direction; a link arm guide provided integrally with the seat cushion portion and having a second shaft portion extending in the vehicle length direction; a first link arm having a lower end portion rotatably connected to the floor side member about the first shaft portion and an upper end portion rotatably connected to the link arm guide about the second shaft portion; a second link arm having a lower end portion rotatably connected to the floor side member around the first shaft portion and having a guided portion at an upper end portion thereof that is guided by the link arm guide; Equipped with A vehicle seat configured to change the position of the seat body from the forward-tilted state to the flipped-up state by utilizing a link action that rotates at least one of the first link arm and the second link arm around the first shaft portion so that the guided portion approaches the second shaft portion.

2. 2. The vehicle seat according to claim 1, wherein the seat support portion is configured such that, when the seat body is in the forward-tilted state and viewed from the vehicle height direction, the first shaft portion of the floor side member is positioned between the second shaft portion of the link arm guide and the guided portion of the second link arm.

3. 2. The vehicle seat according to claim 1, wherein the seat support portion includes a first biasing member that biases at least one of the first link arm and the link arm guide in a rotational direction so as to move them closer to each other around the second axis portion, and a locking mechanism that releasably locks the seat body in the forward-folded state to a floor.

4. 4. The vehicle seat according to claim 3, wherein the seat support portion includes a second biasing member that biases at least one of the first link arm and the second link arm in a rotational direction that brings them closer to each other about the first shaft portion.

5. The floor is provided with outer seat rails and inner seat rails extending parallel to each other in the vehicle length direction, and the floor side members are attached to the outer seat rails, 5. The vehicle seat according to claim 3, wherein the seat support portion includes a seat leg having a connecting shaft portion connected to the seat cushion portion of the seat body and a mounting shaft portion attached to the inner seat rail via the locking mechanism portion.

6. 5. The vehicle seat according to claim 1, wherein the link arm guide has a guide groove with which the guided portion of the second link arm engages, and the guide groove extends along the vehicle width direction on the outer side of the vehicle than the second axle portion when the seat body is in the forward-folded state, and the outer groove end is arranged so as to be bent.

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