Vehicular seat

Abstract

To provide a vehicular seat comprising a seat operation device that enables reliable cable scheduling.SOLUTION: A vehicular seat S comprises: a seat cushion frame 20; a seat back frame 10; and a seat operation device 30 for regulating rotation of the seat back frame 10. The seat operation device 30 comprises: a base bracket 31; a hook part 36; a first link bracket 32 rotatably attached to the base bracket 31; a second link bracket 33 rotatably attached to the first link bracket 32, and having a lock part 34 to which the hook part 36 is locked; a link lever 40 for adjusting a position of the lock part 34 of the second link bracket 33 by rotating; and a first cable 51 for rotating the link lever 40 by traction. When the link lever 40 rotates to a prescribed angle, regulation using the hook part 36 is released so that the seat cushion frame 20 can be tilted forward.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat that can be adjusted by operating a lever. [Background technology]

[0002] Conventionally, vehicle seats have been developed that have mechanisms for controlling the sliding of the vehicle seat and the rotation of the seat back by operating a lever or seat back provided on the vehicle seat. For example, Patent Document 1 discloses a mechanism in which the sliding device is unlocked by tilting the seat back forward, and the tumble lock mechanism is unlocked by sliding the seat all the way forward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-94996 Summary of the Invention [Problem to be solved by the invention]

[0004] This mechanism is realized by a hook fixed to the seat back and a pin rotatably attached to the seat cushion frame. To tilt the seat back forward (fold-down position), the reclining lever is operated to move the pin to a position where the hook of the seat back does not interfere, and then the seat back is tilted forward. However, if the pin is not moved sufficiently by the reclining lever, the hook may interfere with the pin, which may pull the cable connected to the slide device and unintentionally release the lock of the slide device.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a vehicle seat equipped with a seat operating device that enables a reliable cable schedule. [Means for solving the problem]

[0006] The problem is solved by a vehicle seat including: a seat cushion having a seat cushion frame; a seat back having a seat back frame rotatably attached to the seat cushion; and a seat operating device that restricts rotation of the seat back frame relative to the seat cushion, wherein the seat operating device includes: a base bracket fixed to the seat cushion frame; a hook portion fixed to the seat back frame; a first link bracket rotatably attached to the base bracket; a second link bracket rotatably attached to the first link bracket and having a locking portion with which the hook portion locks; a link lever rotatably attached to the first link bracket and that adjusts the position of the locking portion of the second link bracket by rotating; and a first cable connected to the link lever and that rotates the link lever by being pulled, wherein when the first cable is pulled and the link lever rotates to a predetermined angle, the position of the locking portion of the second link bracket is changed and the restriction by the hook portion is released, allowing the seat cushion frame to be tilted forward, and wherein the seat operating device is configured so that when the link lever rotates by more than the predetermined angle, the position of the locking portion of the second link bracket does not change. By providing a link lever and adjusting the position of the locking portion of the second link bracket by rotating the link lever, it is possible to suppress unintended rotation of the first link bracket even if the amount of pulling on the first cable increases, and to create a structure that prevents tension on the cable. This makes it possible to increase the amount of pulling on the first cable, and when, for example, the seat is to be put into a collapsed state, it is possible to ensure a reliable cable schedule in which the reclining device is unlocked by the release from the second link bracket.

[0007] In the above configuration, the base bracket may be provided with a stopper that stops the movement of the locking portion of the second link bracket, and the locking portion may be locked to the stopper, and a hook of the seat back frame may be locked to the locking portion, thereby causing the seat back to tilt at a predetermined forward angle. By providing a stopper on the base bracket, the seat back frame can be tilted forward at a predetermined forward tilt angle.

[0008] In the above configuration, a slide device is provided which supports the seat cushion and the seat back so that they can slide, and which has a locking portion which restricts the sliding movement, and a second cable which connects to the locking portion is connected to the first link bracket, and when the seat back frame is tilted forward, the hook portion engages with the locking portion of the second link bracket, causing the first link bracket to rotate and the second cable to be pulled, thereby unlocking the slide device. With the above-described configuration, the lock on the sliding device can be easily released.

[0009] In the above configuration, when the seat back frame is tilted forward at the predetermined forward tilt angle, the first cable is pulled, causing the link lever to rotate, which in turn rotates the second link bracket, causing the first link bracket to return to its initial position, and the second cable is released from pulling, thereby locking the slide device. With the above configuration, the seat back can be folded down and the slide device can be locked.

[0010] In the above configuration, the slide device may include a biasing portion that moves the seat back and the seat cushion forward when the lock is released. By providing the biasing portion, the seat back and the seat cushion can be automatically moved when the lock is released.

[0011] In the above configuration, the link lever may be provided with a cable holding portion that holds a fitting cylinder on which an end of the first cable is provided. By forming the end of the first cable with a fitting cylinder and providing a cable holding portion on the link lever that holds the fitting cylinder, the link lever can be rotated appropriately when the first cable is pulled.

[0012] In the above configuration, the link lever may be formed in a fan shape. By forming the link lever in a fan shape, the link lever can be arranged compactly.

[0013] In the above configuration, the second link bracket may be provided with a link bracket pin extending outward in the seat width direction, and the link lever may be formed with a slit through which the link bracket pin passes. By inserting the link bracket pin extending from the second link bracket into the slit, the link bracket can be operated more reliably by rotating the link lever. [Effects of the Invention]

[0014] According to the above vehicle seat, it is possible to provide a vehicle seat equipped with a seat operating device that enables a reliable cable schedule. Furthermore, by providing a stopper on the base bracket, the seat back frame can be tilted forward at a predetermined forward tilt angle. In addition, the lock on the sliding device can be easily released. In addition, the seat back can be folded down and the slide device can be locked. Furthermore, by providing the biasing portion, the seat back and the seat cushion can be automatically moved when the lock is released. In addition, by forming the end of the first cable with a fitting cylinder and providing a cable holding portion on the link lever that holds the fitting cylinder, the link lever can be rotated appropriately when the first cable is pulled. Furthermore, by forming the link lever in a fan shape, the link lever can be arranged compactly. By inserting the link bracket pin extending from the second link bracket into the slit, the link bracket can be operated more reliably by rotating the link lever. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side view of a vehicle seat according to an embodiment of the present invention; [Figure 2] 10A and 10B are explanatory diagrams showing the transition of the vehicle seat to a folded-down state; [Figure 3] 10A and 10B are explanatory diagrams showing the transition of the vehicle seat to a walk-in state; [Figure 4] FIG. 2 is a perspective view showing a walk-in unit for a vehicle seat. [Figure 5] FIG. 2 is a side view showing the walk-in unit of the vehicle seat in an initial position. [Figure 6A] FIG. 10 is a diagram showing a state in which the link lever is rotated to a first angular position. [Figure 6B] FIG. 10 is a diagram showing a state in which the link lever is rotated to a second angular position. [Figure 6C] FIG. 10 is a diagram showing a state in which the link lever is rotated to a third angular position. [Figure 7A] FIG. 10 is a diagram illustrating the operation leading up to the transition to the collapsed state, showing the state in which the reclining cable is pulled. [Figure 7B] 10 is a diagram showing a state in which the reclining cable is further pulled. FIG. [Figure 7C] FIG. 10 is a diagram showing a state in which the seat back is tilted forward. [Figure 8A]FIG. 10 is a diagram illustrating the transition to the walk-in state, showing the state in which the walk-in knob is operated. [Figure 8B] FIG. 10 is a diagram showing a state in which the seat back is tilted forward and the sliding device is unlocked. [Figure 8C] FIG. 10 is a diagram illustrating the operation when transitioning from the walk-in state to the fall-down state, showing the state when the reclining lever is operated. [Figure 8D] 10A and 10B are diagrams illustrating a state in which the first link bracket has returned to its initial position. [Figure 8E] FIG. 10 shows the walk-in unit in a collapsed state. [Figure 9] FIG. 10 is an explanatory diagram showing the operation of a conventional walk-in unit. DETAILED DESCRIPTION OF THE INVENTION

[0016] The configuration of a vehicle seat according to one embodiment of the present invention will be described below with reference to the drawings. However, the embodiment described below is intended to facilitate understanding of the present invention and is not intended to limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and of course, the present invention also includes equivalents thereof. In the following description, the contents regarding the materials, shapes, and sizes of the seat components are merely examples and do not limit the present invention.

[0017] In the following description, the term "front-rear direction" refers to the front-rear direction of the vehicle seat (in other words, the front-rear direction of the seat body), which is the direction that coincides with the traveling direction when the vehicle is traveling. The term "seat width direction" refers to the width direction of the vehicle seat (in other words, the width direction of the seat body), which is the direction that coincides with the left-right direction as seen by an occupant seated in the vehicle seat. The term "up-down direction" refers to the up-down direction of the vehicle seat, which is the direction that coincides with the vertical direction when the vehicle is traveling on a horizontal plane. In the following description, unless otherwise specified, the term "rotation" refers to a rotational movement about an axis along the seat width direction.

[0018] The shapes, positions, and postures of the various parts of the vehicle seat described below will be explained assuming that the vehicle seat is in the seated state described below, unless otherwise specified.

[0019] The basic configuration and operation of a vehicle seat according to this embodiment (hereinafter referred to as vehicle seat S) will be described with reference to Fig. 1. Fig. 1 is a perspective view of the vehicle seat S. For convenience of illustration, Fig. 1 shows a portion of the vehicle seat S with the trim cover Tr removed.

[0020] The vehicle seat S is placed on the vehicle body floor FL and is a seat in which a vehicle occupant sits. In this embodiment, the vehicle seat S is used as a front seat disposed at the front of the vehicle. However, the present invention is not limited to this, and the vehicle seat S may also be used as a rear seat disposed at the rear of the vehicle. Furthermore, the vehicle seat S may also be used as a middle seat in the second row or a rear seat in the third row in a vehicle having three rows of seats in the front-to-rear direction.

[0021] As shown in FIG. 1, a vehicle seat S has a seat body Sh that forms its main body. The seat body Sh mainly comprises a seat back 1 that serves as a backrest portion supporting the back of the seated occupant, a seat cushion 2 that serves as a seating portion supporting the buttocks of the seated occupant, and a headrest 3 that is disposed on top of the seat back 1 and supports the head of the seated occupant. The seat back 1 and the seat cushion 2 are connected via a reclining device 5. A sliding device 4 is installed below the seat body Sh. This sliding device 4 allows the seat body Sh to be attached to the vehicle floor FL in a state that allows it to slide in the fore-and-aft direction of the vehicle seat S. The slide device 4 is composed of a lower rail 4a fixed to the vehicle floor FL and an upper rail 4b that slides on the lower rail 4a. The slide device 4 is provided with a locking portion (not shown) that restricts the sliding of the upper rail 4b. The slide device 4 is provided with a biasing portion (not shown) that moves the seat body Sh forward when the lock is released.

[0022] A seat frame F is provided inside the vehicle seat S, and the seat frame F is composed of a seat back frame 10 which is the frame of the seat back 1 and a seat cushion frame 20 which is the frame of the seat cushion 2.

[0023] The seat back frame 10 mainly includes a pipe frame (not shown) made of pipes processed into a rectangular frame shape, a back panel (not shown), and back side frames 11. A pad member P and a trim cover Tr are provided on the outside of the seat back frame 10 and the seat cushion frame 20, thereby constituting the seat back 1 and the seat cushion 2. The pad member P is a urethane base material formed by foam molding using, for example, a urethane foam material, and the trim cover Tr is made of a material such as cloth or leather.

[0024] The seat cushion frame 20 includes a cushion side frame 21, and the rear end of the cushion side frame 21 and the lower end of the back side frame 11 are attached to each other via the reclining device 5 in a rotatable manner. A walk-in unit 30 is provided around the reclining device 5. The reclining device 5 and the walk-in unit 30 are covered by a unit cover 6 to prevent contact with the outside.

[0025] A reclining lever 7 is provided on the side of the seat cushion 2. The reclining lever 7 and the reclining device 5 are connected by a reclining cable 51. As shown in FIG. 2, when the occupant operates the reclining lever 7, the reclining device 5 is unlocked and the seat back 1 can be tilted forward relative to the seat cushion 2 (in the direction of arrow A in FIG. 2) to a completely folded state (fall-down state).

[0026] A walk-in knob 8 is provided on the shoulder of the seat back 1. As shown in FIG. 3, when the occupant operates the walk-in knob 8, the reclining device 5 is unlocked and the seat back 1 can be tilted forward (in the direction of arrow B in FIG. 3). At this time, the seat back 1 is stopped from tilting forward midway by the walk-in unit 30. At this time, the lock on the slide device 4 is released by the forward tilt of the seat back 1, and the seat main body Sh can be slid forward (in the direction of arrow C in FIG. 3) by a biasing device provided on the slide device 4, and can be moved to the foremost position of the slide device 4.

[0027] <Walk-in Unit 30> The configuration of the walk-in unit 30 of this embodiment will be described with reference to Fig. 4 and Fig. 5. Fig. 4 is a perspective view showing the walk-in unit 30 provided on the vehicle seat S. Fig. 5 is a side view showing the walk-in unit 30 provided on the vehicle seat S, and is a diagram showing the initial positions of brackets and the like that constitute the walk-in unit 30.

[0028] The walk-in unit 30 is mainly composed of a base bracket 31, a first link bracket 32, a second link bracket 33, a hook portion 36, and a link lever 40. The walk-in unit 30 corresponds to the seat operating device of the present invention.

[0029] The base bracket 31 is a member that is fixed by a fastening member to the rear end of the cushion side frame 21. The base bracket 31 is a member that forms the base of the walk-in unit 30. A first link bracket 32 ​​is provided on the base bracket 31 so as to be rotatable around the rotation axis 5a of the reclining device 5.

[0030] <Base bracket 31> Base bracket 31 is provided with a claw-shaped stopper 31a that stops rotation of first link bracket 32. In addition, the lower end of base bracket 31 is provided with reclining cable holder 31b and sliding cable holder 31c, which are formed as flanges that extend outward from the seat.

[0031] A reclining cable 51 extending from the reclining lever 7 is attached to the reclining cable holder 31b. The reclining cable 51 is composed of a stranded metal wire 51a and an outer tube 51b that covers the stranded metal wire 51a, and the end of the outer tube 51b is held by the reclining cable holder 31b. An engaging tube 51c is provided at the end of the stranded metal wire 51a, and the engaging tube 51c is attached to the link lever 40, which will be described later. By operating the reclining lever 7, the occupant can pull the reclining cable 51 and rotate the link lever 40. The reclining cable 51 corresponds to the first cable of the present invention.

[0032] A slide cable 52 extending from the slide device 4 is attached to the slide cable holding portion 31c. There are two slide cables 52, and they extend from lock portions provided on the lower rails 4a arranged on the left and right sides of the vehicle seat S, respectively. The sliding cable 52 is also composed of a stranded metal wire 52a and an outer tube 52b that covers the stranded metal wire 52a, and an end of the outer tube 52b is held by the sliding cable holding part 31c. An attachment part 52c at the end of the stranded metal wire 52a of the sliding cable 52 is attached to the first link bracket 32. The sliding cable 52 corresponds to the second cable of the present invention.

[0033] <First link bracket 32> As described above, the first link bracket 32 ​​is a member rotatably provided on the base bracket 31. The first link bracket 32 ​​rotates around the rotation axis 5a of the reclining device 5. In addition, the second link bracket 33 and the link lever 40 are rotatably attached to the first link bracket 32. As described above, the mounting portion 52c of the slide cable 52 is attached to the first link bracket 32. The mounting portion 52c of the slide cable 52 is held by the cable holding portion 32b of the first link bracket 32. When the first link bracket 32 ​​rotates counterclockwise in FIG. 5, the slide cable 52 is pulled and the slide device 4 is unlocked. The first link bracket 32 ​​is provided with an engagement portion 32a that engages with the walk-in pin 34 extending from the second link bracket 33, which will be described later.

[0034] <Second link bracket 33> The second link bracket 33 is a member rotatably attached to the first link bracket 32. The second link bracket 33 is formed in a V-shape, with a rotation axis 33a provided at its center. A walk-in pin 34 extending inward in the seat width direction is attached to one end of the second link bracket 33. When the second link bracket 33 is in its initial position, the walk-in pin 34 is positioned to engage with the hook portion 36. The walk-in pin 34 corresponds to the locking portion of the present invention. A link bracket pin 35 extending outward in the seat width direction is attached to the other end of the second link bracket 33. The link bracket pin 35 is configured to pass through a link bracket slit 42 formed in the link lever 40.

[0035] <Hook part 36> The hook portion 36 is fixed to the back side frame 11 of the seat back 1 and is configured to move in accordance with the movement of the seat back 1. The hook portion 36 is fastened and fixed to the back side frame 11 using a fastening member. The tip of the hook portion 36 is formed in a claw shape, and when the seat back 1 is tilted forward, it engages with the walk-in pin 34 of the second link bracket 33 described above.

[0036] <Link Lever 40> The link lever 40 is a member rotatably attached to the first link bracket 32. The link lever 40 is formed in a fan shape. By forming the link lever 40 in a fan shape, the link lever 40 can be arranged compactly. The link lever 40 rotates around a rotation axis 43. The link lever 40 is provided with a cable holding portion 41 into which a fitting cylindrical body 51c of the reclining cable 51 fits. The link lever 40 is configured to rotate around the rotation axis 43 by pulling the reclining cable 51 with the reclining lever 7.

[0037] The link lever 40 also has a link bracket slit 42 through which the link bracket pin 35 extending from the second link bracket 33 passes. As shown in FIG. 5, the link bracket slit 42 is formed in a V-shape. As will be described in detail later, when the link lever 40 rotates, the link bracket pin 35 moves within the link bracket slit 42, thereby rotating the second link bracket 33. The link lever 40 has a hole 44 formed in its center. By forming the hole 44, the weight of the link lever 40 is reduced.

[0038] <Operation of Conventional Walk-in Unit 130> Here, the operation of the conventional walk-in unit 130 will be described with reference to Fig. 9. Fig. 9 is an explanatory diagram showing the operation of the conventional walk-in unit 130 when transitioning to the fall-down state. In a conventional walk-in unit 130, to shift to the folded-down state, the reclining lever is operated to pull the reclining cable 151 in the direction of arrow W. The reclining cable 151 and the slide cable 152 are held by the base bracket 131. When pulling the reclining cable 151, the seat back may move before the walk-in pin 134 of the second link bracket 133 moves to a position where it can escape from the hook portion 136, causing the hook portion 136 to interfere with the walk-in pin 134 (middle diagram in FIG. 9). Furthermore, if the seat back is reclined in this state, the first link bracket 132 rotates in the direction of arrow Y in conjunction with the second link bracket 133, causing the connected slide cable 152 to be pulled in the direction of arrow Z, which may unintentionally unlock the slide device (right diagram in FIG. 9).

[0039] In order to address this issue, if the stroke of the reclining lever is adjusted to pull second link bracket 133 more, first link bracket 132 may also rotate significantly, which may unlock the sliding device along with the reclining device. Also, if second link bracket 133 is pulled all the way by reclining cable 151, reclining cable 151 may become taut, making it impossible to move the reclining lever.

[0040] To solve the above-mentioned problems, the walk-in unit 30 of this embodiment is provided with a link lever 40 to appropriately operate the second link bracket 33. That is, the shape of the link lever 40 operates the walk-in pin 34 of the second link bracket 33, so that even if the amount of pull on the reclining cable 51 increases, the first link bracket 32 ​​does not rotate, and the reclining cable 51 does not become taut. This makes it possible to increase the amount of cable pull on the second link bracket 33, and when shifting to the collapsed state, a reliable cable schedule is possible, from releasing the second link bracket 33 to releasing the reclining device.

[0041] The operation of the second link bracket 33 using the link lever 40 will be described below with reference to Figures 5 to 6C. Figure 5 is a side view showing the initial position of the walk-in unit 30. Figure 6A is a diagram showing a state in which the reclining cable 51 has been pulled and the link lever 40 has been rotated to a first angle position. Figure 6B is a diagram showing a state in which the reclining cable 51 has been further pulled and the link lever 40 has been rotated to a second angle position, and Figure 6C is a diagram showing a state in which the reclining cable 51 has been further pulled and the link lever 40 has been rotated to a third angle position.

[0042] In the initial position of the walk-in unit 30 shown in Figure 5, the walk-in pin 34 of the second link bracket 33 is located at the highest position. In this state, even if the seat back 1 is tilted forward and the hook portion 36 moves, the seat back cannot be tilted forward because the hook portion 36 interferes with the walk-in pin 34.

[0043] Next, as shown in FIG. 6A, when the reclining lever 7 is operated and the reclining cable 51 is pulled in the direction of arrow A1, the fitting cylinder 51c moves in the direction of arrow B1, and the link lever 40 rotates forward around the rotation axis 43 by a first angle α1 (25 to 35 degrees). When link lever 40 rotates by first angle α1, link bracket pin 35 of second link bracket 33 is raised by the inner wall of link bracket slit 42, and second link bracket 33 rotates around rotation axis 33a. As a result, walk-in pin 34 of second link bracket 33 moves down in the direction of arrow C1. The position of walk-in pin 34 is lowered, allowing it to move away from hook portion 36. In this state, even if hook portion 36 moves, there is no interference.

[0044] 6B, when reclining lever 7 is operated and reclining cable 51 is further pulled in the direction of arrow A2, the fitting cylinder itself moves further in the direction of B2. However, even when rotated through second angle α2 (40 to 45 degrees), the change in position of link bracket pin 35 is small, and therefore the amount of rotation of second link bracket 33 is small, and the change in position of walk-in pin 34 is also small.

[0045] As shown in Figure 6C, even if the reclining lever 7 is operated and the reclining cable 51 is further pulled in the direction of arrow A3 and rotated to the third angle α3 (65 to 75 degrees), the position of the link bracket pin does not change, so the amount of rotation of the second link bracket 33 is small and the change in the position of the walk-in pin 34 is also small.

[0046] As described above, even if the amount of pull on the reclining cable 51 is increased and the reclining lever is rotated beyond the first angle α1, the amount of rotation of the second link bracket 33 does not increase and the position of the walk-in pin 34 does not change. Therefore, the first link bracket 32 ​​does not rotate, and the reclining cable 51 is not stretched. In other words, the amount of pull on the reclining cable 51 can be increased, and when the seat is placed in the fallen-down state, a reliable cable schedule can be executed, in which the reclining device 5 is unlocked by the walk-in pin 34.

[0047] <Transition to falldown state> Next, the operation of the walk-in unit 30 until the vehicle seat S is shifted to the folded-down state will be described with reference to FIG. 5 and FIGS. 7A to 7C. Fig. 7A is a diagram showing a state in which reclining cable 51 is pulled, and Fig. 7B is a diagram showing a state in which reclining cable 51 is further pulled. Fig. 7C is a diagram showing a state in which the seat back is tilted forward.

[0048] When transitioning the vehicle seat S from the initial position shown in FIG. 5 to the folded-down state, the occupant begins to operate the reclining lever 7 provided on the side of the seat cushion 2. Next, as shown in FIG. 7A, by operating the reclining lever 7, the reclining cable 51 is pulled in the direction of arrow D1 in FIG. 7A. This pulling causes the fitting cylinder 51c to move, which in turn causes the link lever 40 to rotate in the direction of arrow E1 around the rotation shaft 43. This rotation causes the link bracket pin 35 of the second link bracket 33 to abut against the inner wall of the link bracket slit 42 of the link lever 40.

[0049] As shown in FIG. 7B, when the reclining cable 51 is further pulled in the direction of arrow D2, the link lever 40 rotates in the direction of arrow E2, and the link bracket pin 35 is moved forward (in the direction of arrow F2) by the inner wall of the link lever 40. As a result, the second link bracket 33 rotates around the rotation axis 33a, and the walk-in pin 34 moves in the direction of arrow G2 in FIG. 7B. In other words, the position of the walk-in pin 34 drops. At this time, if the link lever 40 is rotated so that the rotation angle α5 is 25 to 35 degrees, the walk-in pin 34 will drop to a position where it does not contact the hook portion 36, and the reclining lock will be released. This allows the occupant to tilt the seat back 1 forward in the direction of arrow H2.

[0050] By releasing the lock as shown in FIG. 7B, the occupant can tilt the seat back 1 forward in the direction of arrow H3 until it reaches the folded-down position as shown in FIG. 7C. At this time, the reclining cable 51 may be pulled to further rotate the link lever 40 in the direction of arrow E3. At this time, the rotation angle α6 is approximately 65 to 75 degrees. Even when the reclining cable 51 is pulled, the second link bracket 33 rotates only a small amount, and the walk-in pin 34 does not drop too far. Furthermore, because the hook portion 36 does not come into contact with the walk-in pin 34, the seat back 1 can be rotated in the direction of arrow H3 and tilted forward to the folded-down position.

[0051] <Transition to walk-in status> The operation of the walk-in unit 30 until the vehicle seat S transitions to the walk-in state will be described with reference to FIG. 5 and FIGS. 8A to 8B. Fig. 8A is a diagram for explaining the transition to the walk-in state, and shows a state in which the walk-in knob 8 is operated. Fig. 8B shows a state in which the seat back 1 is tilted forward and the lock of the sliding device 4 is released.

[0052] To put the seat into the walk-in state, the occupant operates the walk-in knob 8 provided on the shoulder of the vehicle seat S. When the occupant operates the walk-in knob 8, the reclining device 5 is unlocked, and the seat back 1 can be tilted forward.

[0053] The lock is released, and the seat back 1 is rotated in the direction of arrow I1 to a slightly forward-leaning position. At this time, the rotation angle β1 of the seat back 1 is approximately 7 to 10 degrees. By leaning the seat back 1 forward, the hook portion 36 moves forward and, as shown in FIG. 8A, the hook portion 36 comes into contact with the walk-in pin 34. When the hook portion 36 comes into contact, the second link bracket 33 begins to rotate.

[0054] Next, as shown in Figure 8B, the seat back 1 is rotated in the direction of arrow I2 and further tilted forward. The walk-in pin 34 is locked by a stopper 31a provided on the base bracket 31, and the seat back 1 is stopped from tilting forward at a rotation angle β2. At this time, the rotation angle β2 of the seat back 1 is approximately 45 to 60 degrees. Movement of the walk-in pin 34 causes the first link bracket 32 ​​to rotate in the direction of arrow J2 around the rotation axis 5a. The rotation of the first link bracket 32 ​​causes the slide cable 52 to be pulled in the direction of arrow K2. When the slide cable 52 is pulled, the slide device 4 is unlocked. This allows the vehicle seat S, more specifically the seat body Sh, to slide in the front-rear direction. A biasing portion, such as a spring, may be attached to the slide device 4, so that the seat body Sh automatically moves forward when the lock is released.

[0055] <Transition from walk-in state to fall-down state> Next, the operation when transitioning from the walk-in state to the fall-down state will be described with reference to Figures 8B to 8E. Fig. 8B shows the walk-in unit 30 in the walk-in state. Fig. 8C shows the state in which the reclining lever 7 is operated and the reclining cable 51 is pulled, Fig. 8D shows the state in which the first link bracket 32 ​​has returned to its initial position, and Fig. 8E shows the seat back 1 in the folded-down state.

[0056] As shown in FIG. 8B, when the vehicle seat S is in the walk-in position, it may be tilted further forward from this position to the folded-down position. When the reclining lever 7 is operated in the walk-in position, as shown in FIG. 8C, the reclining cable 51 is pulled in the direction of arrow L1, and the link lever 40 rotates around the rotation axis 43 in the direction of arrow M1 in FIG. 8C. When the link lever 40 rotates, the link bracket pin 35 of the second link bracket 33 is pushed by the inner wall of the link bracket slit 42 and moves toward the front of the seat. This causes the second link bracket 33 to rotate in the direction of arrow N1. When the rotation angle γ1 of the link lever 40 reaches 25 to 35 degrees, the hook portion 36 and the walk-in pin 34 are released from contact with each other.

[0057] When the hook portion 36 and the walk-in pin 34 are released from contact with each other, the first link bracket 32 ​​rotates in the direction of arrow N1 and returns to its initial position, as shown in Fig. 8D. When the first link bracket 32 ​​returns to its initial position, the mounting portion 52c of the slide cable 52 moves in the direction of arrow P1, and the pulling force on the slide cable 52 is released, thereby locking the slide device 4 and restricting the sliding movement of the seat body Sh. In this state, as shown in Fig. 8E, the occupant can rotate the seat back 1 in the direction of arrow R1 and tilt the seat back 1 forward until it is in the folded-down state.

[0058] The present invention has been described above with reference to the drawings. The present invention may be applied not only to wheeled ground vehicles such as automobiles and trains and vehicle seats installed therein, but also to aircraft and ships that travel other than on land and seats installed therein. [Explanation of symbols]

[0059] S Vehicle seat (vehicle seat) FL Body floor Sh seat body Tr trim cover P Pad material Front seat frame 1 seat back 2 seat cushions 3 Headrest 4 Slide device 5 Reclining device 5a Rotation axis 6 Unit cover 7 Reclining lever 8 Walk-in Knob 10 Seat back frame 11 Backside Frame 20 Seat cushion frame 21 Cushion side frame 30 Walk-in unit (seat operating device) 31 Base bracket 31a Stopper 31b Reclining cable holder 31c Slide cable holder 32 First link bracket 32a Engagement part 32b Cable holder 33 Second link bracket 33a Rotation axis 34 Walk-in pin (locking part) 35 Link bracket pin 36 Hook part 40 Link lever 41 Cable holder 42 Link bracket slit 43 Rotation axis 44 Hole 51 Reclining cable (first cable) 51a Metallic stranded wire 51b Outer cylinder 51c Fitting cylinder 52 Slide cable (second cable) 52a Metallic stranded wire 52b outer cylinder 52c Mounting part

Claims

1. a seat cushion having a seat cushion frame; a seat back having a seat back frame rotatably attached to the seat cushion; a seat operating device that restricts rotation of the seat back frame relative to the seat cushion, The seat operating device a base bracket fixed to the seat cushion frame; a hook portion fixed to the seat back frame; a first link bracket rotatably attached to the base bracket; a second link bracket rotatably attached to the first link bracket and having a locking portion to which the hook portion is locked; a link lever rotatably attached to the first link bracket and rotating to adjust the position of the locking portion of the second link bracket; a first cable connected to the link lever and configured to rotate the link lever when pulled; When the first cable is pulled and the link lever rotates to a predetermined angle, the position of the locking portion of the second link bracket is changed, the restriction by the hook portion is released, and the seat cushion frame can be tilted forward. This vehicle seat is characterized in that it is configured so that when the link lever rotates by more than the predetermined angle, the position of the locking portion of the second link bracket does not change.

2. 2. The vehicle seat according to claim 1, wherein the base bracket is provided with a stopper that stops the movement of the engaging portion of the second link bracket, and the engaging portion engages with the stopper, and a hook of the seatback frame engages with the engaging portion, thereby causing the seatback to tilt forward at a predetermined forward tilt angle.

3. a slide device that supports the seat cushion and the seat back so that they can slide, and that has a locking portion that restricts the sliding movement; a second cable connected to the locking portion is connected to the first link bracket; 3. The vehicle seat according to claim 2, wherein when the seat back frame is tilted forward, the hook portion engages with the locking portion of the second link bracket, causing the first link bracket to rotate and the second cable to be pulled, thereby unlocking the sliding device.

4. 4. The vehicle seat according to claim 3, wherein when the seat back frame is tilted forward at the predetermined forward tilt angle, the first cable is pulled, causing the link lever to rotate, which in turn rotates the second link bracket, causing the first link bracket to return to its initial position, and the second cable is released from pulling, locking the sliding device.

5. 4. The vehicle seat according to claim 3, wherein the slide device has a biasing portion that moves the seat back and the seat cushion forward when the lock is released.

6. 2. The vehicle seat according to claim 1, wherein the link lever is provided with a cable holding portion that holds a fitting cylinder provided with an end of the first cable.

7. 2. The vehicle seat according to claim 1, wherein the link lever is formed in a fan shape.

8. The second link bracket is provided with a link bracket pin extending outward in the seat width direction, 2. The vehicle seat according to claim 1, wherein the link lever is formed with a slit through which the link bracket pin passes.

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