Vehicle seats

Abstract

The present invention provides a new mechanism for moving a vehicle seat. The vehicle seat has a base portion (lower rail), a first movable portion (lower structure) that can move relative to the base portion, a second movable portion (linking rod) that can move relative to the first movable portion, a locking component installed on the first movable portion, and a lock release portion (lock release pin) provided on the base portion. The second movable portion can move between a first position, a second position after moving relative to the first position, and a third position that is located on the opposite side of the first position relative to the second position. The locking component 50 can move between a locked position that locks the second movable portion from moving from the second position to the third position and an unlocked position that allows the second movable portion to move from the second position to the third position. When the first movable portion moves to a predetermined position relative to the base portion, the lock release portion abuts against the locking component, causing the locking component to move from the locked position to the unlocked position.

Description

Technical Field

[0001] The present invention relates to a vehicle seat capable of changing the layout of the vehicle interior. Background Art

[0002] Conventionally, there is known a mechanism in which a slide lock mechanism is unlocked when the seat back is tilted forward, and a tilt lock mechanism is unlocked when the seat is subsequently slid to the full front position (Patent Document 1).

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] Patent Document 1: Japanese Patent Application Publication No. 2000-94996 Summary of the Invention

[0006] [Technical problem to be solved by the invention]

[0007] Furthermore, there are demands for vehicle seats to be able to change their layouts in various ways. For example, if a seat back is locked in a mid-tilt forward position and then can be unlocked and further tilted forward while the seat is sliding, the variety of vehicle seat layout changes can be expanded.

[0008] It is therefore an object of the present invention to provide a new mechanism for moving a vehicle seat.

[0009] Another purpose is to downsize vehicle seats.

[0010] Another object is to improve the reliability of the movement of the vehicle seat.

[0011] Another purpose is to facilitate visual confirmation of the movement of the vehicle seat.

[0012] [Technical solutions for solving technical problems]

[0013] The present invention for solving the above-mentioned technical problems is a vehicle seat having a seat cushion and a seat back, a base portion, a first movable portion, a second movable portion, a locking member, and a lock release portion, wherein the first movable portion is movable relative to the base portion, the second movable portion is movable relative to the first movable portion, and is movable between a first position, a second position, and a third position, wherein the second position refers to a position after movement relative to the first position, the third position refers to a position on the opposite side of the first position relative to the second position, and the locking member is installed The locking member is located on the first movable part and is capable of moving between a locked position and an unlocked position, wherein the locked position refers to a position in which the locking member locks the second movable part from the second position to the third position by engaging with the second movable part, and the unlocked position is a position in which the locking member allows the second movable part to move from the second position to the third position by disengaging from the engagement with the second movable part, and the lock release portion is provided on the base part, and when the first movable part moves to a specified position relative to the base part, the lock release portion abuts against the locking member, causing the locking member to move from the locked position to the unlocked position.

[0014] According to this structure, after the second movable portion moves from the first position to the second position relative to the first movable portion, it is retained in the second position by the locking member. When the first movable portion is moved to a predetermined position relative to the base portion while the second movable portion is in the second position, the locking member reaches the unlocked position, enabling the second movable portion to move from the second position to the third position.

[0015] The base portion may include a lower rail fixed to a floor of the vehicle, and the first movable portion may include an upper rail slidably movable relative to the lower rail and for mounting the seat cushion.

[0016] The locking member may be supported by the first movable portion so as to be rotatable relative to the first movable portion.

[0017] The vehicle seat may further include a backrest angle adjustment device that switches between a state in which the seat back can be rotated relative to the seat cushion and a state in which the seat back cannot be rotated relative to the seat cushion. In this case, the locking member may be positioned in the left-right direction to overlap with the backrest angle adjustment device.

[0018] According to this structure, the vehicle seat can be reduced in size in the left-right direction.

[0019] The second movable part can be constructed so that it has a bracket and a contact part, the bracket is mounted on the first movable part in a manner that it can rotate around the rotation axis, and has a flat plate part that is orthogonal to the rotation axis and an extension part that extends from the flat plate part in a direction extending from the flat plate part toward the rotation axis, the contact part is fixed to the bracket in a state of contact with the flat plate part and the extension part, and can contact the locking part.

[0020] According to this configuration, since the rigidity of the portion of the second movable portion that contacts the locking member can be increased, the second movable portion can be reliably stopped at the second position.

[0021] The vehicle seat may further include a cover that covers the locking member at least from left and right outer sides.

[0022] According to this configuration, it is possible to suppress the intrusion of dust around the locking member and to improve the reliability of the operation of the vehicle seat.

[0023] The locking member may have an abutting portion abutting against the lock releasing portion and an engaging portion engaging with the second movable portion both located outside the upper rail in the left-right direction.

[0024] According to this structure, the operation of the locking member can be easily confirmed visually.

[0025] Preferably, when the lock member is located at the locked position, a contact width in the left-right direction when the lock member is engaged with the second movable portion is larger than a contact width in the left-right direction when the lock member abuts against the unlocking portion.

[0026] According to this configuration, the second movable portion can be reliably stopped at the second position.

[0027] When the locking member is located at the locked position, the contact portion of the locking member that contacts the unlocking portion may be located below the engaging portion that engages with the second movable portion.

[0028] According to this structure, it is possible to suppress the mechanism from becoming complicated.

[0029] The locking member may be positioned in the vertical direction so as to overlap with the second movable portion.

[0030] According to this structure, the vehicle seat can be downsized in the up-down direction.

[0031] [Effects of the Invention]

[0032] According to the present invention, after the second movable portion moves from the first position to the second position relative to the first movable portion, it is retained in the second position by the locking member. When the first movable portion is moved to a predetermined position relative to the base portion while the second movable portion is in the second position, the locking member reaches the unlocked position, thereby enabling the second movable portion to move from the second position to the third position.

[0033] Furthermore, the base portion has a lower rail, and the first movable portion has an upper rail. By sliding the vehicle seat to a predetermined position, the movable range of the second movable portion located at the second position can be expanded.

[0034] Furthermore, the position of the locking member in the left-right direction overlaps with the seatback angle adjustment device, and thus the vehicle seat can be reduced in size in the left-right direction.

[0035] Furthermore, the contact member is fixed to the bracket while in contact with the flat plate portion and the extension portion of the bracket. This increases the rigidity of the portion of the second movable portion that contacts the locking member, and thus allows the second movable portion to be reliably stopped at the second position.

[0036] Furthermore, the cover covering the locking member at least from the left and right outer sides is provided, thereby preventing dust from entering around the locking member, thereby improving the reliability of the movement of the vehicle seat.

[0037] Furthermore, since the contact portion and the engaging portion of the locking member are both located outside the upper rail in the left-right direction, the movement of the vehicle seat can be easily visually confirmed.

[0038] When the lock member is at the locked position, the left-right contact width when engaged with the second movable portion is larger than the left-right contact width when the lock member abuts against the unlocking portion. Therefore, the second movable portion can be reliably stopped at the second position.

[0039] When the lock member is located at the lock position, the contact portion of the lock member that contacts the unlocking portion is located below the engaging portion that engages with the second movable portion, thereby preventing the mechanism from becoming complicated.

[0040] Since the locking member is positioned in the vertical direction so as to overlap with the second movable portion, the vehicle seat can be reduced in size in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a perspective view showing a vehicle seat according to one embodiment of the present invention.

[0042] Figure 2 It is a perspective view showing the linkage lever, the locking member, and the cover.

[0043] Figure 3 This is a perspective view showing the linkage lever and locking components in an exploded manner.

[0044] Figure 4 It is a diagram showing the positional relationship between the locking member and the seatback angle adjustment device, etc.

[0045] Figure 5 This is a diagram showing a linkage mechanism.

[0046] Figure 6 (a) to (d) are diagrams showing the states of the components of the vehicle seat when it is in an initial state.

[0047] Figure 7 (a) to (d) are views showing the states of the respective components when the seat back is moved from the seating position to the intermediate position.

[0048] Figure 8 (a) to (d) are views showing the states of the respective components when the locking member comes into contact with the lock release pin by sliding the seat body forward.

[0049] Figure 9 (a) to (d) represent the process of making the seat body Figure 8 Figure 2 is a diagram of the states of the various components when the locking component slides forward from its position and rotates to the unlocking position.

[0050] Figure 10 (a) to (d) are diagrams showing the states of the components when the interlocking lever moves from the second position to the third position.

[0051] Figure 11 (a) to (d) are views showing the states of the respective components when the seat back is returned from the stowed position to the seating position.

[0052] Figure 12 (a) to (d) are views showing states of various components of a vehicle seat according to a modified example when the vehicle seat is in an initial state.

[0053] Figure 13 (a) to (d) are views showing the states of the respective components when the seat body is rotated from the seating position to the first forward tilting position.

[0054] Figure 14 (a) to (d) are views showing the states of the respective components when the locking member comes into contact with the lock release pin by sliding the seat body according to the modification forward.

[0055] Figure 15 (a) to (d) represent the process of making the seat body Figure 14Figure 2 is a diagram of the states of the various components when the locking component slides forward from its position and rotates to the unlocking position.

[0056] Figure 16 (a) to (d) are diagrams showing the states of the components when the interlocking lever moves from the second position to the third position.

[0057] Figure 17 (a) to (d) are views showing the states of the respective components when the seat body is returned from the second forward tilted position to the seating position.

[0058] Figure 18 1 and 2 are diagrams showing a latch device, wherein (a) shows a state where the latch is in an engaged position, and (b) shows a state where the latch is in a disengaged position.

[0059] [Explanation of Reference Numerals]

[0060] 40: linkage rod; 50: locking member; S: vehicle seat; S1: seat cushion; S2: seat back; S4: lower structure; S5: lower rail; S52: lock release pin. DETAILED DESCRIPTION

[0061] Next, refer to the attached Figure 1 An embodiment of the present invention will be described.

[0062] like Figure 1 As shown, the vehicle seat S is, for example, a second-row seat in a vehicle. The vehicle seat S includes a seat body S0, a backrest angle adjustment device R, left and right lower structures S4 as an example of a first movable portion, and left and right lower rails S5 as an example of a base portion. In the present invention, front-back, left-right, and top-bottom dimensions are based on the occupant sitting in the seat.

[0063] The seat body S0 includes a seat cushion S1, a seat back S2, and a headrest S3. The seat back S2 is supported by the seat cushion S1 in a rotatable manner. Specifically, the seat back S2 can be turned in the upright seating position ( Figure 6 The position (a) in FIG) and the storage position ( Figure 10 Rotate between the positions (a) in the figure.

[0064] The backrest angle adjustment device R switches the seat back S2 between a position in which it can rotate relative to the seat cushion S1 and a position in which it cannot rotate relative to the seat cushion S1. The backrest angle adjustment device R includes a backrest angle adjustment spring R1 as a movable spring. The backrest angle adjustment spring R1 biases the seat back S2 from the seating position to the stowed position.

[0065] The backrest angle adjustment device R includes a backrest angle lock member (not shown) for locking the seat back S2 in the seating position. A backrest angle release lever L1 is located on the upper portion of the seat back S2 to release the backrest angle lock member. The backrest angle release lever L1 may be located on a side surface of the seat cushion S1 or on both the upper portion of the seat back S2 and a side surface of the seat cushion S1.

[0066] The lower structure S4 is provided on the left and right sides of the lower surface of the seat cushion S1, protruding from the lower surface. The lower structure S4 includes a base frame S41 connected to the seat cushion S1 and an upper rail S42 fixed to the lower end of the base frame S41. The upper rail S42 is slidable in the front-rear direction relative to the lower rail S5. The seat cushion S1 is attached to the upper rail S42 via the base frame S41.

[0067] The lower rail S5 supports the upper rail S42 in such a manner that the upper rail S42 can move in the front-rear direction. The lower rail S5 is fixed to the floor F of the vehicle (refer to Figure 6 (a) in the figure.

[0068] The lower structure S4 is provided with a slide lock mechanism 10 and a simple lock mechanism 20. The slide lock mechanism 10 is a mechanism for prohibiting or allowing the seat body S0 to slide in the front-rear direction. The slide lock mechanism 10 is provided on each of the left and right lower structures S4.

[0069] like Figure 6 As shown in (b) of FIG. 1 , the slide lock mechanism 10 includes a slide lock member 11 as a movable lock member. The slide lock member 11 is a member for locking the sliding movement of the seat body S0 or releasing the lock of the sliding movement. The slide lock member 11 is supported on the lower structure S4 in a rotatable manner, and the top end 11A of the rotatable hook shape can be engaged with the hole S51 formed in the lower rail S5. The slide lock member 11 can be in the movable locking position ( Figure 6 (b) in the lock release position ( Figure 7 The movable locking position is a position where the sliding movement of the seat body S0 is locked, and the unlocked position is a position where the seat body S0 is unlocked. The slide locking member 11 is biased from the unlocked position toward the movable locking position by a spring (not shown).

[0070] return Figure 1 The simple locking mechanism 20 is used to limit the seat back S2 from the middle position ( Figure 7The simple locking mechanism 20 is provided on the lower structure S4 on the left side.

[0071] like Figure 6 (a) and Figure 6 As shown in (d) of FIG. 1 , the simple locking mechanism 20 includes a linkage rod 40 as an example of a second movable portion, and a locking member 50 for locking the movement of the linkage rod 40. The linkage rod 40 is a member that rotates in conjunction with the tilting movement of the seat back S2 and is connected to the seat back S2 via power transmission members (not shown), such as a link, gears, and a belt.

[0072] The linkage rod 40 is rotatably provided on the left and right outer sides of the lower structure S4, and is thereby rotatable relative to the lower structure S4. The linkage rod 40 can be positioned at a first position P1, a second position P2 (see FIG. Figure 7 (d)) and the third position P3 (refer to Figure 10 Rotate between (d)).

[0073] Specifically, the linkage rod 40 is located at a first position P1 when the seat back S2 is in the seating position. It is located at a second position P2 when the seat back S2 is in the intermediate position. The linkage rod 40 is located at a third position P3 when the seat back S2 is in the stowed position. Therefore, the seat back angle adjustment spring R1 biases the linkage rod 40 via the seat back S2, causing it to move from the first position P1 to the third position P3.

[0074] The locking member 50 is rotatably provided on the left and right outer sides of the lower structure S4. Figure 6 (d) position) and unlock position ( Figure 10 The locking member 50 is rotated between the second position P2 and the third position P3, wherein the locked position is a position in which the locking member 50 engages with the linkage rod 40 to lock the linkage rod 40 from moving from the second position P2 to the third position P3, and the unlocked position is a position in which the locking member 50 disengages from the linkage rod 40 to allow the linkage rod 40 to move from the second position P2 to the third position P3. The locking member 50 is biased from the unlocked position to the locked position by a spring (not shown).

[0075] The lower rail S5 is provided with a lock release pin S52, serving as an example of a lock release portion. The lock release pin S52 protrudes from the left and right outer side surfaces of the lower rail S5 and is capable of abutting the locking member 50 in the front-to-back direction. When the lower structure S4 moves to a predetermined forward position relative to the lower rail S5, the lock release pin S52 abuts the locking member 50, causing the locking member 50 to rotate from a locked position to an unlocked position.

[0076] like Figure 2 As shown, the vehicle seat S further includes a cover C that covers the lock member 50 from at least the left and right outer sides. In the present embodiment, the cover C is formed so as to cover the lock member 50 from the outer sides in the front, rear, left, right, and top and bottom directions.

[0077] like Figure 3 As shown, the interlocking lever 40 includes a lever body 41, a bracket 42, and a contact member 43. Each member (41 to 43) constituting the interlocking lever 40 is made of metal, for example.

[0078] The rod body 41 is an elongated, plate-like member. It has a circular hole 41A at its lower end. This hole 41A is rotatably supported by a protrusion provided on the lower structure S4. The rod body 41 is attached to the lower structure S4 so as to be rotatable about the rotation axis X1.

[0079] The bracket 42 is joined to the rod body 41 by welding, etc. Thus, the bracket 42 is rotatably mounted to the lower structure S4 via the rod body 41 and is rotatable relative to the lower structure S4 about a rotation axis X1 extending in the left-right direction.

[0080] Bracket 42 includes a flat plate portion 42A perpendicular to rotation axis X1 and an extending portion 42B extending from flat plate portion 42A in a direction extending along rotation axis X1. Flat plate portion 42A includes a hole 42C concentric with hole 41A of lever body 41.

[0081] The extension portion 42B is formed so as to bend leftward and rightward from the flat plate portion 42A. The extension portion 42B is bent into an L-shape along a corner portion that forms a portion of the periphery of the flat plate portion 42A. Specifically, the extension portion 42B has a first wall B1 that contacts the front end of the contact member 43 and a second wall B2 that contacts the lower end of the contact member 43.

[0082] The contact member 43 has a rear end portion 43A that can contact the locking member 50. The contact member 43 is fixed to the bracket 42 by welding or other means while in contact with the flat plate portion 42A and the extension portion 42B. A recess 43B is formed at the front end of the contact member 43 to prevent interference with an R-shaped portion (not shown) formed by bending the extension portion 42B from the flat plate portion 42A. This ensures that the contact member 43 reliably contacts the flat plate portion 42A and the extension portion 42B.

[0083] The locking member 50 includes a rotation shaft 51, a first plate 52, a second plate 53, a connecting shaft 54, and an engaging portion 55. The rotation shaft 51 is rotatably supported by the lower structure S4, the first plate 52 and the second plate 53 are fixed to the rotation shaft 51 by welding or the like, the connecting shaft 54 ​​connects the first plate 52 and the second plate 53, and the engaging portion 55 is supported by the connecting shaft 54. Each component (51 to 55) constituting the locking member 50 is made of metal, for example.

[0084] The rotating shaft 51 includes a cylindrical first shaft portion 51A and a second shaft portion 51B, and a flange portion 51C. The flange portion 51C has a larger diameter than the first shaft portion 51A and the second shaft portion 51B. The first shaft portion 51A protrudes laterally inward from the flange portion 51C and is rotatably supported by the lower structure S4. The second shaft portion 51B protrudes laterally outward from the flange portion 51C.

[0085] The first plate 52 is a flat plate with a generally V-shape perpendicular to the left-right direction. Specifically, the first plate 52 includes a main body 52A that is elongated in the front-to-back direction and a trapezoidal shape, and an abutment portion 52B that extends downward from the rear portion of the main body 52A. The front end of the abutment portion 52B is capable of abutting the aforementioned lock release pin S52.

[0086] The main body 52A is formed into a trapezoidal shape, with the rear portion of its upper surface being a flat surface extending along the front-to-back direction and the front portion of its upper surface being an inclined surface inclined diagonally forward and downward. The main body 52A has a hole H1 for the second shaft portion 51B to pass through and a hole H2 for the connecting shaft 54 ​​to pass through. Hole H1 is formed at a front corner of the upper portion of the main body 52A. Hole H2 is formed at the front end of the main body 52A. The first plate 52 is secured to the rotating shaft 51 by welding or the like, with the second shaft portion 51B inserted into hole H1 and the first plate 52 in contact with the flange portion 51C.

[0087] The connecting shaft 54 ​​includes a shaft portion 54A and a flange portion 54B having a larger diameter than the shaft portion 54A. The shaft portion 54A protrudes outwardly and leftwardly from the flange portion 54B. The connecting shaft 54 ​​is fixed to the first plate 52 by welding or the like, with the shaft portion 54A inserted into the hole H2 of the first plate 52 and the flange portion 54B in contact with the first plate 52.

[0088] The engagement portion 55 is a cylindrical member that engages with the contact member 43 of the interlocking lever 40. The engagement portion 55 is supported by the shaft portion 54A of the connecting shaft 54.

[0089] The second plate 53 has a first portion 53A and a second portion 53B. The first portion 53A and the first plate 52 sandwich an engaging portion 55. The second portion 53B extends from the first portion 53A toward the first plate 52. The first portion 53A has a hole H3 and a hole H4. The hole H3 engages with a boss provided at the top end of the second shaft portion 51B, and the hole H4 engages with a boss provided at the top end of the shaft portion 54A. With the bosses engaged with the holes H3 and H4, the first portion 53A is joined to the shaft portions 51B and 54A, respectively, by welding or the like.

[0090] The width of the rear end portion 43A of the contact member 43 in the left-right direction is greater than the width (plate thickness) of the abutment portion 52B in the left-right direction. In addition, the length of the engagement portion 55 in the left-right direction is greater than the width of the rear end portion 43A of the contact member 43 in the left-right direction. Figure 4 As shown, the left-right contact width WD1 when the lock member 50 is engaged with the interlocking lever 40 when located at the locked position is larger than the left-right contact width WD2 when the lock member 50 abuts against the unlocking pin S52 .

[0091] The lock member 50 is positioned in the left-right direction so as to overlap with the seatback angle adjustment device R. The contact portion 52B and the engaging portion 55 of the lock member 50 are both positioned outside the upper rail S42 in the left-right direction.

[0092] In addition, if Figure 6 As shown in (d) in FIG. 5 , the locking member 50 is vertically positioned to overlap the interlocking lever 40 . When the locking member 50 is located at the locked position, the contact portion 52B is located below the engagement portion 55 .

[0093] like Figure 1 As shown, a linkage mechanism 30 is provided below the seat cushion S1 for interlocking the movement of the slide lock mechanism 10 with the movement of the seat back S2. The linkage mechanism 30 is configured to change the slide lock mechanism 10 from a locked state to an unlocked state when the seat back S2 is rotated from the seating position to the intermediate position, and to change the slide lock mechanism 10 from the unlocked state to a locked state when the seat back S2 is rotated from the intermediate position to the stowed position.

[0094] The linkage mechanism 30 includes a first wire W1 as an example of a first connecting member, a second wire W2 as an example of a second connecting member, a third wire W3 as an example of a third connecting member, and a fourth wire W4. The components within the linkage mechanism 30 and the linkage rod 40 of the simple locking mechanism 20 are connected via the first wire W1 and the third wire W3. This allows the force generated by the rotation of the seat back S2 to be transmitted to the linkage mechanism 30.

[0095] The left and right slide lock mechanisms 10 are connected to components in the linkage mechanism 30 via the second wire W2 , respectively.

[0096] A slide lock release lever L2 is provided at the front end of the seat cushion S1 for releasing the lock of the slide lock mechanism 10. The slide lock release lever L2 is connected to a component within the linkage mechanism 30 via a fourth wire W4. This allows the force applied to the slide lock release lever L2 to be transmitted to the left and right slide lock mechanisms 10.

[0097] like Figure 5 As shown, the linkage mechanism 30 includes a mounting member 31, a first rotating member 32, a second rotating member 33, a swinging member 34, a holding member 35, a first spring 36, a second spring 37, a swinging spring 38, and a limiting spring 39. Each member (31 to 39) constituting the linkage mechanism 30 is made of metal, for example.

[0098] The mounting member 31 is a member mounted on the lower structure S4 and is formed in a box shape by bending the peripheral edge of a metal plate.

[0099] The first rotating member 32 and the second rotating member 33 are rotatably mounted on the mounting member 31 so as to rotate about a common rotation axis X2. Specifically, the first rotating member 32 and the second rotating member 33 are rotatably supported by a cylindrical boss 31A provided on the mounting member 31.

[0100] The first rotating member 32 has a wire connecting portion 32A for connecting one end of the first wire W1. The other end of the first wire W1 is connected to the above-mentioned interlocking rod 40 (see Figure 6 (d) in FIG). According to this, in conjunction with the rotation of the interlocking lever 40, the first rotating member 32 can be in the first rotation position ( Figure 6 The second rotation position (c) in FIG) corresponding to the second position P2 Figure 7 The position (c) in FIG) and the third rotation position ( Figure 10In the following description, the rotation direction of the first rotating member 32 rotated by pulling the first wire W1, that is, the clockwise rotation direction is also referred to as the first rotation direction, and the opposite direction of the first rotation direction is also referred to as the second rotation direction.

[0101] The first rotating member 32 further includes an engaging edge 32B that engages with the swinging member 34 and a restricting edge 32C that restricts the rotation of the holding member 35. The engaging edge 32B and the restricting edge 32C are formed as part of the periphery of the first rotating member 32.

[0102] The engaging edge 32B is located upstream in the first rotational direction relative to a swing engaging portion 34A (described later) of the swing member 34. The engaging edge 32B is configured such that when the first rotation member 32 is within the range from the first rotational position to the second rotational position, the engaging edge 32B engages with the swing engaging portion 34A. When the first rotation member 32 moves from the second rotational position to the third rotational position, the engaging edge 32B disengages from the swing engaging portion 34A. Accordingly, the swing member 34 is configured such that when the interlocking lever 40 is within the range from the first position P1 to the second position P2, the swing member 34 engages with the engaging edge 32B of the first rotation member 32. When the interlocking lever 40 moves from the second position P2 to the third position P3, the swing member 34 disengages from the engaging edge 32B of the first rotation member 32.

[0103] The limiting edge 32C is formed in an arc shape centered on the rotation axis X2. The limiting edge 32C is configured to contact a pin 35A (described later) of the retaining member 35 before the first rotating member 32 reaches the second rotation position from the first rotation position, and to disengage from the pin 35A when the first rotating member 32 reaches the second rotation position.

[0104] The first rotating member 32 is biased in the second rotational direction by the first spring 36. Specifically, the first spring 36 biases the first rotating member 32 in the direction opposite to the direction in which it receives the force from the first wire W1. The mounting member 31 includes a limiting wall 31B that limits movement of the first rotating member 32 from the first rotational position in the second rotational direction.

[0105] The second rotating member 33 has a wire connecting portion 33A that connects one end of each of the two second wires W2 and one end of the fourth wire W4. The other end of each second wire W2 is connected to the above-mentioned left and right sliding locking members 11 (see Figure 6 (b) in FIG. 1 ). In addition, the other end of the fourth wire W4 is connected to the above-mentioned slide lock release lever L2 (see FIG. Figure 1 ).

[0106] The second rotating member 33 further includes a restricting edge 33B that restricts the rotation of the holding member 35 and a contact edge 33C that can contact the holding member 35 in the rotation direction of the second rotating member 33. The restricting edge 33B and the contact edge 33C are formed as part of the periphery of the second rotating member 33.

[0107] The limiting edge 33B is formed in an arc shape centered on the rotation axis X2 and, when projected in a direction along the rotation axis X2, overlaps with the limiting edge 32C of the first rotating member 32. Like the limiting edge 32C of the first rotating member 32, the limiting edge 33B can contact or disengage from the pin 35A of the holding member 35.

[0108] The contact edge 33C extends from the downstream end of the limiting edge 33B in the second rotation direction toward the rotation axis X2. When the holding member 35 is located at the limiting position ( Figure 7 (c) in the figure) contacts the pin 35A.

[0109] The second rotating member 33 also has an arc-shaped hole 33D centered on the rotation axis X2. The mounting member 31 has a restriction protrusion 31C that enters the hole 33D. The restriction protrusion 31C is located at the second rotating member 33. Figure 7 When the second rotational position is in the position shown (the position corresponding to the second rotational position), the second rotational member 33 is in contact with one end of the upstream side of the first rotational direction of the hole 33D, thereby limiting the second rotational member 33 from Figure 7 The position shown in FIG. 1 is moved in the first rotation direction. In addition, the mounting member 31 has a limiting piece 31D, which limits the second rotating member 33 from Figure 5 The position shown (the position corresponding to the first rotational position) moves in the second rotational direction.

[0110] The second rotating member 33 is biased in the second rotation direction by the second spring 37. That is, the second spring 37 biases the second rotating member 33 in the direction of the first rotating member 32 by the biasing force of the first spring 36.

[0111] The swinging member 34 is mounted on the second rotating member 33 so as to be capable of swinging about the swing axis X3. The swinging member 34 includes a swinging engagement portion 34A that engages with the engagement edge 32B of the first rotating member 32. The swinging engagement portion 34A has a cylindrical surface that contacts the engagement edge 32B and is located upstream in the first rotational direction relative to the swing axis X3. The swinging engagement portion 34A is movable radially in the direction of the boss 31A by the swinging member 34. The swinging member 34 is biased toward the rotation axis X2 by a swinging spring 38.

[0112] By constructing the first rotating component 32, the second rotating component 33 and the swinging component 34 as described above, the state in which the first rotating component 32 and the second rotating component 33 both rotate in the first rotation direction and the state in which the first rotating component 32 and the second rotating component 33 rotate separately are switched, and after the sliding locking component 11 moves from the movable locking position to the lock release position, it can be moved to the movable locking position again.

[0113] In detail, Figures 6 and 7 As shown, when the linkage rod 40 moves from the first position P1 to the second position P2, the first rotating member 32 and the second rotating member 33 are rotated by the engagement of the swing member 34 and the first rotating member 32, and the slide locking member 11 moves from the movable locking position to the unlocking position. Figures 9 and 10 As shown, when the linkage rod 40 moves from the second position P2 to the third position P3, the swinging member 34 disengages from the first rotating member 32, so that the first rotating member 32 and the second rotating member 33 can rotate separately, thereby moving the sliding locking member 11 from the unlocking position to the movable locking position.

[0114] Furthermore, the torque applied to the first rotating member 32 by the above-mentioned backrest angle adjustment spring R1 via the interlocking rod 40 and the like is greater than the torque applied to the first rotating member 32 by the first spring 36 and the second spring 37. Consequently, the first wire W1, which is pulled by the biasing force of the backrest angle adjustment spring R1, can cause the unit consisting of the first rotating member 32, the second rotating member 33, and the swinging member 34 to rotate, overcoming the biasing force of the first spring 36 and the second spring 37.

[0115] The retaining member 35 is a member that, when the first rotating member 32 is in the second rotational position, that is, when the interlocking lever 40 is in the second position P2, restricts the second rotating member 33 from rotating in the second rotational direction, thereby retaining the slide locking member 11 in the unlocked position. The retaining member 35 is provided on the mounting member 31 so as to be rotatable about the retaining axis X4.

[0116] The holding member 35 includes a pin 35A that can engage with the restriction edges 32C and 33B and the contact edge 33C. The pin 35A can be moved in the radial direction of the boss 31A by the rotation of the holding member 35.

[0117] The holding member 35 can be in the allowable position ( Figure 5 Position) and restricted position ( Figure 7The retaining member 35 is rotated between the positions (c) in the figure), wherein the allowing position is a position that allows the second rotating member 33 to rotate in the second rotational direction, and the restricting position is a position that restricts the second rotating member 33 from rotating in the second rotational direction. The retaining member 35 is biased from the allowing position to the restricting position by the restricting spring 39.

[0118] The holding member 35 is in the permitted position when the first rotating member 32 is in the first rotational position, that is, when the interlocking lever 40 is in the first position P1. When the holding member 35 is in the permitted position, the pin 35A contacts the limiting edges 32C and 33B. Thus, the limiting edges 32C and 33B restrict the holding member 35 from moving from the permitted position to the restricted position due to the biasing force of the limiting spring 39.

[0119] When the first rotating member 32 moves from the first rotational position to the second rotational position, that is, when the interlocking lever 40 moves from the first position P1 to the second position P2, the pin 35A disengages from the limiting edges 32C and 33B, thereby rotating the retaining member 35 from the permitted position to the restricted position. When the retaining member 35 is in the restricted position, the pin 35A contacts the contact edge 33C. Thus, the pin 35A restricts the second rotating member 33 from moving in the second rotational direction due to the biasing force of the second spring 37.

[0120] The holding member 35 further includes a wire connecting portion 35B for connecting one end of the third wire W3. The other end of the third wire W3 is connected to the above-mentioned linkage rod 40 (see Figure 6 (d) in FIG. 4 ). As a result, in conjunction with the rotation of the linkage rod 40 , the holding member 35 rotates against the biasing force of the restriction spring 39 .

[0121] The third wire W3 is connected to the holding member 35 and the interlocking rod 40 (see FIG. 1 ) with a margin larger than that of the first wire W1. Figure 6 (d) in the figure). Accordingly, when the interlocking rod 40 starts to move from the first position P1 to the third position P3, the first rotating member 32 connected to the interlocking rod 40 via the first wire W1 immediately starts to rotate, but the holding member 35 connected to the interlocking rod 40 via the third wire W3 does not rotate for a period of time and starts to rotate while the interlocking rod 40 moves from the second position P2 to the third position P3.

[0122] That is, the first wire rod W1 causes the first rotating member 32 to be linked to the interlocking rod 40 in either case when the interlocking rod 40 moves from the first position P1 to the second position P2 or when the interlocking rod 40 moves from the second position P2 to the third position P3. On the other hand, the third wire rod W3 does not cause the holding member 35 to be linked to the interlocking rod 40 in the case when the interlocking rod 40 moves from the first position P1 to the second position P2, but causes the holding member 35 to be linked to the interlocking rod 40 in the case when the interlocking rod 40 moves from the second position P2 to the third position P3.

[0123] Next, the operation method of the vehicle seat S and the movement of each component are described in the case where the vehicle cabin space is expanded by moving the vehicle seat S forward in the folded state and in the case where the vehicle seat S moved forward is returned to the initial state. In the initial state, the posture and position of the vehicle seat S and each component are as follows: Figure 6 The posture and position shown in (a).

[0124] like Figure 1 As shown, when the passenger operates the backrest angle adjustment release lever L1 and releases the lock of the backrest angle adjustment device R, as shown in FIG. Figure 6 and Figure 7 As shown, the seat back S2 rotates from the seated position to the neutral position due to the biasing force of the backrest angle adjustment spring R1, and in conjunction with this, the linkage lever 40 rotates from the first position P1 to the second position P2. When the first wire W1 is pulled by the rotation of the linkage lever 40, the first rotating member 32 and the second rotating member 33 rotate together in the first rotation direction.

[0125] When the second rotating member 33 rotates in the first rotating direction, the second wire W2 is pulled by the second rotating member 33, and the sliding locking member 11 moves from the movable locking position to the unlocked position. When the linkage rod 40 reaches the second position P2, the linkage rod 40 engages with the locking member 50, restricting the rotation of the linkage rod 40. Accordingly, the linkage rod 40 is held in the second position P2, and the seat back S2 is held in the middle position, and the first rotating member 32 and the second rotating member 33 are held in the middle position. Figure 7 Therefore, the slide lock member 11 pulled by the second wire W2 connected to the second rotating member 33 is held in the unlocked position.

[0126] When the linkage rod 40 reaches the second position P2, the holding member 35 moves from Figure 5 The limiting edges 32C and 33B shown are disengaged and rotated from the permission position to the limiting position. Accordingly, the second rotating member 33 is subjected to the force of the second spring 37 and the spring urging the slide lock member 11, and is restricted by the holding member 35 from rotating in the second rotation direction.

[0127] After this, if Figure 8 As shown, when the seat body S0 is slid forward, the locking member 50 abuts against the lock release pin S52 at a predetermined position. Figure 9 As shown, the linkage lever 40 is rotated from the locked position to the unlocked position. Accordingly, the locking of the linkage lever 40 is released.

[0128] When the locking of the linkage rod 40 is released, the loading force of the backrest angle adjustment spring R1 is adjusted, as shown in FIG. Figure 10 As shown, the seat back S2 rotates from the intermediate position to the storage position, and the linkage lever 40 rotates from the second position P2 to the third position P3.

[0129] When the interlocking lever 40 rotates from the second position P2 to the third position P3, the interlocking lever 40 pulls the first wire W1 and the third wire W3. Pulling the first wire W1 causes the first rotating member 32 to rotate in the first rotational direction and move from the second rotational position to the third rotational position. Pulling the third wire W3 causes the retaining member 35 to rotate from the restricted position to the permitted position. Consequently, the second rotating member 33 becomes rotatable in the second rotational direction.

[0130] When the first rotating member 32 rotates from the second rotating position to the third rotating position, the second rotating member 33 is retracted by the second spring 37 (see FIG. Figure 5 ) loading force and returns to the initial position. Accordingly, the second wire W2 relaxes, and the slide lock component 11 moves from the unlocked position to the locked position again. As described above, the vehicle seat S is moved forward in the folded state to expand the vehicle cabin space.

[0131] When returning the vehicle seat S that has been moved forward to its initial state, as shown in FIG. Figure 11 As shown, the passenger stands up the seat back S2 that has been tilted forward and returns to the seat position. When the seat back S2 is moved to the seat position, the seat back S2 is locked in the seat position by the backrest angle adjustment locking member of the backrest angle adjustment device R.

[0132] Furthermore, when the seat back S2 rotates from the stowed position to the seated position, the linkage rod 40 rotates from the third position P3 to the first position P1 in conjunction therewith. As a result, the first wire W1 relaxes, and the first rotating member 32 rotates from the third rotation position to the first rotation position. When the first rotating member 32 returns to the first rotation position, the swing member 34 swings toward the rotation axis X2 by the biasing force of the swing spring 38, and again engages with the engaging edge 32B of the first rotating member 32 (see FIG. Figure 5 ) engage.

[0133] Furthermore, when the interlocking lever 40 is rotated from the third position P3 to the first position P1, thereby loosening the third wire W3, the holding member 35 is pressed against the limiting edges 32C and 33B of the first and second rotating members 32 and 33 by the biasing force of the limiting spring 39. Consequently, the interlocking mechanism 30 returns to its initial state.

[0134] After this, the crew operates Figure 1 The slide lock release lever L2 shown in FIG. 2 releases the lock on the slide lock member 11, allowing the seat body S0 to slide rearward, thereby returning the vehicle seat S to its initial position. Furthermore, when the occupant operates the slide lock release lever L2, the second rotating member 33 is rotated in the first rotation direction via the fourth wire W4, and the second rotating member 33 pulls the second wire W2, thereby releasing the lock on the slide lock member 11.

[0135] According to the above description, the following effects can be obtained in this embodiment.

[0136] A new mechanism can be provided that links the slide lock member 11 for locking the sliding movement of the seat cushion S1 (lower structure S4) and the seat back S2 (linking rod 40) that moves relative to the seat cushion S1.

[0137] By configuring the first rotating member 32 and the second rotating member 33 to rotate about a common rotation axis X2, for example, compared with a structure in which the rotation axis of the first rotating member and the rotation axis of the second rotating member are arranged at different positions, the linkage mechanism 30 and thus the vehicle seat S can be miniaturized.

[0138] By restricting the rotation of the second rotating member 33 by the holding member 35 , the slide lock member 11 can be more reliably held in the unlocked position.

[0139] When the linkage rod 40 moves from the first position to the second position, the seat back S2 is maintained in the intermediate position because the linkage rod 40 is retained in the second position by the locking member 50. When the seat cushion S1 is moved to a predetermined position relative to the lower rail S5 while the linkage rod 40 is in the second position, the locking member 50 reaches the unlocked position, and the linkage rod 40 moves from the second position to the third position, thereby enabling the seat cushion S1 to move from the intermediate position to the stowed position.

[0140] By sliding the seat body S0 to a predetermined position through the sliding operation, it is possible to realize an operation of expanding the movable range of the interlocking lever 40 located at the second position.

[0141] Since the position of the locking member 50 in the left-right direction overlaps with the seatback angle adjustment device R, the vehicle seat S can be reduced in size in the left-right direction.

[0142] Since the contact member 43 is fixed to the bracket 42 in contact with the flat plate portion 42A and the extension portion 42B, the rigidity of the portion of the interlocking lever 40 that contacts the lock member 50 can be increased, thereby providing a sense of rigidity in the movement of the vehicle seat S.

[0143] Since the lock member 50 is covered by the cover C, dust can be suppressed from entering around the lock member 50 , and the reliability of the operation of the vehicle seat S can be improved.

[0144] Since the contact portion 52B and the engaging portion 55 of the lock member 50 are located on the left and right outer sides of the upper rail S42 , the operation of the lock member 50 can be easily visually confirmed.

[0145] Compared with the contact width WD2 when the locking member 50 abuts the lock release pin S52, the contact width WD1 when the locking member 50 is engaged with the linkage rod 40 when in the locked position is larger, thereby improving the rigidity of the movement of the linkage rod 40 when moving from the first position to the second position.

[0146] When the lock member 50 is located at the lock position, the contact portion 52B is located below the engagement portion 55 , thereby preventing the mechanism from becoming complicated.

[0147] Since the position of the locking member 50 in the vertical direction overlaps with the interlocking rod 40 , the vehicle seat S can be reduced in size in the vertical direction.

[0148] In addition, the present invention is not limited to the above-mentioned embodiment, and can be used in various forms as exemplified below.

[0149] In the above embodiment, a locking component 50 is constructed with an abutment portion 52B and an engagement portion 55, but the present invention is not limited to this. For example, a mechanism in which a first component having an abutment portion and a second component having an engagement portion are linked by a link mechanism or the like can also be used as a locking component.

[0150] The first movable portion is not limited to sliding relative to the base portion, and may also rotate relative to the base portion. For example, the seat body as the first movable portion may also be configured to rotate about a vertical axis relative to the lower rail as the base portion.

[0151] The second movable portion is not limited to the case where it rotates relative to the first movable portion, and the second movable portion may also slide relative to the first movable portion.

[0152] The base portion is not limited to the lower rail and may, for example, be another component fixed to the lower rail. Furthermore, the base portion is not limited to being fixed to the vehicle floor. Alternatively, the base portion may be a seat cushion, the first movable portion may be a seat back, and the second movable portion may be a component that rotates relative to the seat back, such as an armrest.

[0153] In the above embodiment, the backrest angle adjustment locking member is exemplified as the second locking member capable of locking the second movable portion at the first position, but the present invention is not limited thereto and may be any member as long as it can lock the second movable portion at the first position.

[0154] In the above embodiment, a holding member is provided to hold the second rotating member at a position corresponding to the second rotational position. However, when the first rotating member is located at the second rotational position, the holding member may be omitted while maintaining the engagement between the swing member and the first rotating member.

[0155] The connecting member is not limited to a wire, and may be, for example, a rod.

[0156] In the above embodiment, the linkage rod 40 is linked to the tilting of the seat back S2, but the present invention is not limited thereto. For example, Figures 12 to 16 As shown, when the entire seat body S0 is tilted, the interlocking rod 40 may be interlocked with the tilting of the seat body S0.

[0157] Specifically, in Figure 12 In the embodiment shown, the seat cushion S1 is supported by the lower structure S4 in a rotatable manner around the rotation axis X5 along the left-right direction. Figure 12 Seating positions shown, Figure 13 The first forward tilt position shown, and Figure 16 The seat body S0 rotates between the first and second forward tilted positions shown. In the seated position, the seat surface of the seat cushion S1 is substantially horizontal. The first forward tilted position is where the seat cushion S1 is tilted forward relative to the seated position. The second forward tilted position is where the seat cushion S1 is tilted forward relative to the first forward tilted position. The seat body S0 is biased from the seated position toward the second forward tilted position by a spring (not shown).

[0158] The seat cushion S1 includes a latch device 60 for locking the seat body S0 in the seated position. The latch device 60 locks or unlocks the seat body S0 relative to the lower structure S4 by engaging with or disengaging from a latch 70 provided on the lower structure S4. The latch 70 can be, for example, a rod-shaped member connecting the left and right frames of the lower structure S4.

[0159] like Figure 18As shown, the latch device 60 includes a box 61 fixed to the seat cushion S1 and a latch 62 rotatably supported on the box 61. The box 61 has an entry groove 61A into which the bolt 70 can enter. The latch 62 can be turned in the direction of rotation. Figure 18 The engagement position shown in (a) is the same as Figure 18 Rotate between the disengaged positions shown in (b).

[0160] When the latch 62 is in the engaged position, the latch 62 is engaged with the bolt 70. When the latch 62 is in the disengaged position, the latch 62 is disengaged from the bolt 70. The latch 62 is urged from the disengaged position to the engaged position by a spring (not shown).

[0161] return Figure 12 A latch release lever L11 is provided on the upper portion of the seat back S2 for releasing the locking of the latch 62. The latch release lever L11 and the latch 62 are connected by a wire W11.

[0162] The interlocking rod 40 according to the present embodiment is configured to interlock with the rotation of the seat body S0. Specifically, the interlocking rod 40 is connected to the seat body S0 via a power transmission member (not shown) such as a link, a gear, or a belt.

[0163] The linkage rod 40 is located at the first position P1 when the seat body S0 is located at the seated position. The linkage rod 40 is located at the second position P2 (see FIG. 1 ) when the seat body S0 is located at the first forward tilted position. Figure 13 When the seat body S0 is located at the second forward tilt position, the linkage rod 40 is located at the third position P3 (see Figure 16 ).

[0164] Next, the operation method of the vehicle seat S and the movement of each component are described in the case where the vehicle cabin space is expanded by moving the seat body S0 that has been tilted forward to the second forward tilt position and in the case where the seat body S0 that has been tilted forward returns to the initial state. In the initial state, the posture and position of the seat body S0 and each component are as follows: Figure 12 The posture and position shown in (a).

[0165] like Figure 12 (a) Figure 13 As shown in (a) of FIG. 1 , when the occupant operates the latch release lever L11 to release the latch device 60, the seat body S0 rotates from the seated position to the first forward tilted position due to the biasing force of a spring (not shown). In conjunction with this, the interlocking lever 40 rotates from the first position P1 to the second position P2. When the first wire W1 is stretched by the rotation of the interlocking lever 40, the first rotating member 32 rotates together with the second rotating member 33 in the first rotation direction.

[0166] When the second rotating member 33 rotates in the first rotating direction, the second wire W2 is stretched by the second rotating member 33, and the sliding locking member 11 moves from the movable locking position to the released position. When the linkage rod 40 reaches the second position P2, the linkage rod 40 engages with the locking member 50, restricting the rotation of the linkage rod 40. Accordingly, the linkage rod 40 is maintained at the second position P2, and the seat body S0 is maintained at the first forward tilting position, and the first rotating member 32 and the second rotating member 33 are maintained. Figure 13 Therefore, the slide lock member 11 stretched by the second wire W2 connected to the second rotating member 33 is held in the released position.

[0167] When the interlocking lever 40 reaches the second position P2, the holding member 35 rotates from the permission position to the restriction position. As a result, the holding member 35 restricts the second rotation member 33 from rotating in the second rotation direction.

[0168] After this, if Figure 14 As shown, when the seat body S0 is slid forward, the locking member 50 abuts against the lock release pin S52 at a predetermined position. Figure 15 As shown, the linkage lever 40 is rotated from the locked position to the unlocked position. Accordingly, the locking of the linkage lever 40 is released.

[0169] When the locking of the linkage rod 40 is released, as shown in FIG. Figure 16 As shown, the seat body S0 rotates from the first forward tilting position to the second forward tilting position by the biasing force of a spring (not shown), and the interlocking lever 40 rotates from the second position P2 to the third position P3.

[0170] When the interlocking lever 40 rotates from the second position P2 to the third position P3, it pulls the first wire W1 and the third wire W3. Pulling the first wire W1 causes the first rotating member 32 to rotate in the first rotational direction, moving from the second rotational position to the third rotational position. Pulling the third wire W3 causes the retaining member 35 to rotate from the restricted position to the permitted position. This allows the second rotating member 33 to rotate in the second rotational direction.

[0171] When the first rotating member 32 rotates from the second rotating position to the third rotating position, the second rotating member 33 is released by the second spring 37 (see FIG. Figure 5 ) and returns to the initial position. Consequently, the second wire W2 relaxes, and the slide lock member 11 moves from the released position back to the locked position. This allows the seat body S0, which has tilted forward to the second forward tilt position, to move forward, thereby expanding the vehicle interior space.

[0172] When the seat body S0 that has been moved forward is returned to its initial state, as shown in FIG. Figure 17 As shown, the passenger rotates the seat body S0 in the second forward tilt position to return it to the seated position. When the seat body S0 is moved to the seated position, the latch device 60 engages with the lock bolt 70, thereby locking the seat body S0 in the seated position.

[0173] Furthermore, when the seat body S0 rotates from the second forward tilting position to the seated position, the linkage rod 40 rotates from the third position P3 to the first position P1 in conjunction with the rotation of the seat body S0. As a result, the first wire W1 relaxes, and the first rotating member 32 rotates from the third rotation position to the first rotation position. When the first rotating member 32 returns to the first rotation position, the swing member 34 swings toward the rotation axis X2 by the biasing force of the swing spring 38, and again engages with the engaging edge 32B of the first rotating member 32 (see FIG. Figure 5 ).

[0174] When the third wire W3 is loosened due to the rotation of the linkage lever 40 from the third position P3 to the first position P1, the holding member 35 is pressed against the limiting edges 32C and 33B of the first rotating member 32 and the second rotating member 33 by the biasing force of the limiting spring 39 (see FIG. Figure 5 ). Accordingly, the linkage mechanism 30 returns to the initial state.

[0175] After this, the crew can operate Figure 1 The slide lock release lever L2 shown in FIG. 1 releases the lock of the slide lock member 11 and returns the vehicle seat S to the initial state by sliding the seat body S0 rearward.

[0176] The components described in the above-mentioned embodiment and modifications may be implemented in any combination.

Claims

1. A vehicle seat having a seat cushion and a seat back, characterized in that: It has a base portion, a first movable portion, a second movable portion, a locking member, and a lock release portion, wherein: The first movable portion is movable relative to the base portion. The second movable portion is movable relative to the first movable portion and is movable between a first position, a second position, and a third position, wherein the second position is a position after movement relative to the first position, and the third position is a position located on the opposite side of the first position relative to the second position. The locking member is mounted on the first movable portion and is movable between a locked position and an unlocked position, wherein the locked position is a position in which the locking member locks the second movable portion from moving from the second position to the third position by engaging with the second movable portion, and the unlocked position is a position in which the locking member allows the second movable portion to move from the second position to the third position by disengaging from the engagement with the second movable portion. The lock releasing portion is provided on the base portion, and when the first movable portion moves to a predetermined position relative to the base portion, the lock releasing portion abuts against the lock member to move the lock member from the locked position to the unlocked position.

2. The vehicle seat according to claim 1, wherein The base portion has a lower rail fixed to the floor of the vehicle. The first movable portion includes an upper rail that is slidable relative to the lower rail and is used to mount the seat cushion.

3. The vehicle seat according to claim 2, characterized in that The locking member is supported by the first movable portion so as to be rotatable relative to the first movable portion.

4. The vehicle seat according to claim 2, wherein: The seat backrest angle adjustment device is further provided, the seat backrest angle adjustment device being switched between a state in which the seat backrest can be rotated relative to the seat cushion and a state in which the seat backrest cannot be rotated relative to the seat cushion. The position of the locking member in the left-right direction overlaps with the seatback angle adjustment device.

5. The vehicle seat according to claim 2, wherein: The second movable part has a bracket and a contact member, The bracket is mounted on the first movable portion so as to be rotatable about a rotation axis, and includes a flat plate portion perpendicular to the rotation axis and an extending portion extending from the flat plate portion in a direction extending toward the rotation axis. The contact member is fixed to the bracket in a state of being in contact with the flat plate portion and the extending portion, and is capable of coming into contact with the locking member.

6. The vehicle seat according to claim 2, wherein: A cover is further provided, which covers the locking member from at least the left and right outer sides.

7. The vehicle seat according to claim 2, wherein: The locking member has an abutting portion abutting against the lock releasing portion and an engaging portion engaging with the second movable portion both located outside the upper rail in the left-right direction.

8. The vehicle seat according to claim 2, wherein: A contact width in the left-right direction when the lock member is located at the lock position and engaged with the second movable portion is larger than a contact width in the left-right direction when the lock member abuts against the lock release portion.

9. The vehicle seat according to claim 2, wherein: When the locking member is located at the locking position, the contact portion of the locking member that contacts the lock releasing portion is located below the engaging portion that engages with the second movable portion.

10. The vehicle seat according to any one of claims 2 to 9, characterized in that: The locking member is positioned so as to overlap with the second movable portion in the vertical direction.

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