JP2012020595A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately lock a seat back to a forward tilting position in a vehicle seat with a memory device which stores a backrest angle before performing stop operation while reclining the seat back into a forward tilting position.SOLUTION: The memory device 10 includes: a hook 11 provided in the seat back 2; an intermediate ring 12 provided rotatably in a base 4; and a lock device 13 which can lock rotation of the intermediate ring 12 to the base 4. The hook 11 is, although normally held at a condition of being entered in a recess 12A formed in an outer periphery of the intermediate ring 12 by the engaging force, is removed from a recess 12A at halfway stop operation, falls front and revolves with the seat back 2 leaving the intermediate ring 12, and Locking of the locking pin 2P prepared in a framework of the seat back 2 is locked at a forward tilting position to abut to a locking projection 12B formed in the intermediate ring 12.

Description

  The present invention relates to a vehicle seat. Specifically, it is possible to perform a halfway stop operation that tilts the seat back to the forward tilt position and a large tilt operation that tilts the seat back to the large tilt position beyond the forward tilt position, and the backrest before performing the midway stop operation of the seat back The present invention relates to a vehicle seat provided with a memory device that stores an angle and guides the seat back so as to be raised up to a stored back angle position after a halfway stop operation.

  2. Description of the Related Art Conventionally, in a vehicle seat, a configuration having a so-called walk-in function and a tilt-down function is known (see Patent Document 1 below). The former walk-in function switches the seat back to a forward leaning posture and releases the slide lock state with respect to the floor of the seat body, and retracts the entire seat to the front side of the vehicle so that the passenger can get on and off the seat on the rear row side. It is intended to expand the space. The latter tilt-down function folds the entire seat down to the lower side by lowering the seat back to the position where it is greatly tilted beyond the forward tilt position and by greatly sinking the seat cushion downward. Yes. In addition, the vehicle seat can store the backrest angle before the seatback is tilted forward during the walk-in operation, and can be returned to the stored backrest angle by the operation of raising the seatback to the original posture after the walk-in operation. The memory device is provided.

  Specifically, the memory device includes a hook (engagement member) provided on the seat back, and an engaged member and a lock device provided on a base body that supports the seat back. The engaged member is supported so as to be rotatable around the center of tilting of the seat back with respect to the base body, and is always held in a state of being prevented from rotating with respect to the base body by a lock device. Further, the hook is normally held in a state of being engaged with the engaged member by being hooked into a recess formed in the outer peripheral portion of the engaged member. In the memory device, when the backrest angle of the seat back is adjusted or the tilt-down operation is performed, the locked state of the engaged member by the locking device is released, and the engaged member becomes a hook. The seat back follows the tilting rotation of the seat back, and the backrest angle of the seat back is stored by being stopped at the rotated position. In addition, when the walk-in operation is performed, the memory device keeps the locked state of the engaged member by the lock device, and the hook is released from the engagement with the engaged member, together with the seat back. It is tilted forward leaving the engaged member. Therefore, by raising the seat back after the walk-in operation, the hook enters the recess by the biasing force when the seat back reaches the stored backrest angle position. It can be returned to a fixed position.

JP 2009-126322 A

  However, in the above prior art, the stopper structure that keeps the forward rotation of the seat back in the forward tilted position during the walk-in operation is configured such that the hook itself is brought into contact with the protrusion of the engaged member in the rotation-stopped state and locked. Therefore, in the structure in which the rotation is stopped by the hook having such a movable structure, the accuracy of the locking position of the seat back cannot be sufficiently obtained. The present invention was devised as a solution to the above-mentioned problem, and the problem to be solved by the present invention is to store the backrest angle before performing a halfway stop operation for tilting the seat back to the forward tilt position. An object of the present invention is to enable a seat back to be locked at a forward tilt position with high accuracy in a vehicle seat provided with a memory device.

  According to the first aspect of the present invention, it is possible to perform a halfway stop operation of tilting the seat back to the forward tilt position and a large tilt operation of tilting the seat back to the large tilt position beyond the forward tilt position, and before performing the halfway stop operation of the seat back. This is a vehicle seat equipped with a memory device that stores the backrest angle and guides it so that it can be raised up to the backrest angle position where the seat back is stored after a halfway stop operation. The seat back is connected to the base body on the floor via a reclining device that functions as a rotation shaft device that can stop rotation, and is always held in a state in which the backrest angle is fixed. The fixed state of the backrest angle is solved during operation. The memory device includes an engagement member provided on the seat back, an engaged member provided rotatably on the base body, and a lock device capable of locking the rotation of the engaged member relative to the base body. . The engaging member is normally held in a state in which the engaged member is integrally engaged with the seat back in the rotation direction by entering the recess formed in the outer peripheral portion of the engaged member by the urging force. However, when it is stopped halfway, it is removed from the recess, so that it can be rotated forward with the seat back leaving the engaged member. The engaged member is normally held in a state of being prevented from rotating with respect to the base body by the lock device. However, at the time of a large-turn operation, the locked state by the lock device is released and the engaged member is drawn. It looks like it rotates forward with the seat back. A stopper structure for locking the seat back to the forward tilted position during the halfway stop operation is provided as a member to be engaged, which is provided directly and integrally with the skeleton of the seat back separately from the engaging member. It is configured to be locked by hitting the formed locking protrusion.

  According to the first aspect of the present invention, the engaging member constituting the memory device is removed from the recessed portion and released from the engaged state with the engaged member when the seat back is stopped halfway. Leaving forward and rotating with the seat back. This forward rotation of the seat back is a state in which a locking member provided directly and integrally fixed to the skeleton of the seat back separately from the engagement member is locked to the base body by the lock device. By being brought into contact with the engaging protrusion of the engaged member, it is locked in the forward tilt position. As described above, the locking member provided directly and integrally with the skeleton of the seat back is configured to lock the forward rotation of the seat back to the forward tilted position. Compared to the configuration in which the movable member functions as the locking member, the seat back can be locked at the set forward tilt position with high accuracy.

  According to a second invention, in the first invention described above, the lock device is configured to engage with the outer peripheral portion of the engaged member to lock the rotation of the engaged member. The locking projection protrudes radially outward from the outer peripheral portion of the engaged member, and the width in the rotational direction is greatly reduced, and the engaged member is rotated together with the seat back to the fully inclined position during operation. In this way, the locking device and the mutual arrangement in the rotational direction are extended to a position where they overlap each other, and the structure strength is increased. Interference with the locking device is avoided by the inclined shape in which the protruding amount in the radial direction decreases toward the overlapping tip side portion.

  According to the second aspect of the invention, the protruding amount in the radial direction is reduced toward the front end portion where the locking projections overlap so that the locking projection can avoid interference with the locking device when the seat back is largely tilted. Due to the inclined shape, the structural strength of the locking projection can be increased so as not to interfere with the locking device.

  According to a third aspect of the present invention, in the first or second aspect described above, the lock device includes an engagement tooth that can be engaged with an engaged tooth formed on the outer peripheral portion of the engaged member. The tooth member is pressed from the back side by the rotation of the cam, and is held in a state in which the engaging tooth is pressed against the engaged tooth to hold the rotation of the engaged member. Yes.

  According to the third aspect of the invention, the locking device is configured to press the engaging tooth member from the back side by the cam and press the engaging tooth member to the outer peripheral portion of the engaged member to hold it in mesh. The locking strength of the engaged member by the engaging tooth member can be increased.

1 is a side view illustrating a schematic configuration of a vehicle seat according to a first embodiment. It is a perspective view which shows the frame | skeleton structure of a vehicle seat. It is the side view which expanded and showed the memory device. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is a side view which shows the state which operated the tilt down lever. It is a side view which shows the state which operated the walk-in lever. FIG. 7 is a side view showing a state where the seat back is brought down to the forward tilt position and locked from the state of FIG. 6. FIG. 6 is a side view showing a state in which the tilt-down lever is operated and the seat back is largely tilted to a position.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the vehicle seat according to the first embodiment will be described with reference to FIGS. As shown in FIGS. 1 to 2, the vehicle seat of the present embodiment retracts the seat body 1 to the front side so as to widen the boarding / alighting space for the rear seat (not shown). And a tilt-down function for operating the seat body 1 so as to be folded onto the floor F smaller. In the former walk-in function, the seat back 2 is switched to a forward tilted posture, the slide lock state with respect to the floor F of the seat body 1 is released, and the entire seat is slid to the front side of the vehicle to be retracted. The space for getting on and off the seat on the side is expanded. In the latter tilt-down function, the seat back 2 is folded down to the position where it is greatly tilted beyond the forward tilt position, and the seat cushion 3 is greatly sunk downward, so that the entire seat body 1 is folded down downward. It has become a thing. Further, the right side of the vehicle seat shown in FIG. 2 stores the backrest angle before the forward tilting operation of the seat back 2 during the walk-in operation, and the seat back 2 after the walk-in operation. A memory device 10 is provided so that the seat back 2 can be returned to the original stored backrest angle by an operation of raising the seat back to the original posture. A specific configuration of the memory device 10 will be described in detail later.

  Here, the seat body 1 includes a seat back 2 that serves as a backrest, a seat cushion 3 that serves as a seating portion, and a base body 4 that supports the seat back 2 and the seat cushion 3 with respect to the floor F. And it is the structure connected with the state which can slide to the vehicle front-back direction with respect to the floor F via the left-right paired slider apparatus 30 provided in the lower surface part of the base body 4. As shown in FIG. The seat back 2 is rotatably connected to the upright surfaces of the base body 4 disposed on both outer sides of the seat back 2 via reclining devices 20 functioning as rotation shaft devices capable of stopping rotation. Has been.

  The reclining device 20 is normally held in a non-rotating state and is in a state in which the backrest angle of the seat back 2 is fixed. The rotation stopping state of the reclining device 20 is released by operating the walk-in lever 8 or the tilt-down lever 9 provided on the vehicle seat. The seat back 2 is always in a direction to rotate forwardly around the rotation center 20 </ b> R of the reclining device 20 with respect to the base body 4 by a spring biasing force of a spring member (not shown) hooked between the seat back 2 and the base body 4. It is in an energized state. Thereby, the seat back 2 is configured to rotate forward relative to the base body 4 by the urging force when the rotation stopping state of the reclining device 20 is released.

  Specifically, when the walk-in lever 8 is operated, the seatback 2 is rotated forward by a stopper structure formed between the seat back 2 and the memory device 10 described later, as shown in FIG. Is fixed to the forward tilt position shown in FIG. However, when the tilt-down lever 9 is operated to rotate the seat back 2 forward, as shown in FIG. 8, the stopper structure does not function as shown in FIG. To be done.

  By the way, returning to FIGS. 1 to 2, the seat cushion 3 is linked so that the front lower portions of the left and right sides of the cushion frame 3 </ b> F constituting the skeleton can be rotated by the front links 6 to the front end portions of the left and right base bodies 4. The rear end portions of the left and right sides of the cushion frame 3F are connected to the left and right side portions of the back frame 2F constituting the skeleton of the seat back 2 by the rear links 5 integrally connected thereto. It is connected. Thereby, the seat cushion 3 is fixed so as not to move with respect to the base body 4 and the seat back 2 via the front link 6 and the rear link 5 in a state where the backrest angle of the seat back 2 is fixed. It is supposed to be kept in the state. Further, the seat cushion 3 is operated to operate the walk-in lever 8 or the tilt-down lever 9 so that the seat back 2 is rotated forward to rotate, so that the front link 6 is rotated forward while being pushed by this movement. However, it sinks to the front side of the seat.

  Therefore, as described above with reference to FIG. 7, when the seat back 2 is brought down to the forward tilt position by the operation of the walk-in lever 8, the seat cushion 3 sinks forward in conjunction with this movement. Can be brought down to the forward tilt position without interfering with the seat cushion 3. Further, as described above with reference to FIG. 8, when the seat back 2 is tilted down to the position by operating the tilt down lever 9, the seat cushion 3 similarly sinks forward in conjunction with this movement. 2 can be pushed down to a lower position so as to overlap the upper part of the seat cushion 3 sinking downward.

  Hereinafter, a configuration in which the seat back 2 can be tilted to a forward tilt position or a large tilt position by operating the walk-in lever 8 and the tilt down lever 9, and a seat back that has been tilted to a forward tilt position. The configuration of the memory device 10 that enables the 2 to return to the stored backrest angle position before the forward tilt operation will be described. First, the configuration of the memory device 10 will be described. As shown in FIG. 3, the memory device 10 is configured to be rotatable around a rotation center 20 </ b> R at the hook 11 provided on the side portion of the back frame 2 </ b> F forming the skeleton of the seat back 2 and the outer peripheral portion of the reclining device 20. And an intermediate ring 12 attached to the base body 4 and a locking device 13 for stopping the rotation of the intermediate ring 12 with respect to the base body 4. Here, the hook 11 corresponds to the engaging member of the present invention, and the intermediate ring 12 corresponds to the engaged member of the present invention.

  The hook 11 is rotatably connected to the back frame 2F by a connecting shaft 11A. The hook 11 is always connected via the first release plate 14 before the aforementioned walk-in lever 8 and tilt-down lever 9 are operated. The first cam 15 connected to the back frame 2F is pressed from the back side (the upper side in the figure), and the protrusion 11B enters the recess 12A formed in the outer peripheral portion of the intermediate ring 12. Is retained. As a result, the seat back 2 is normally held in a state of being integrally engaged with the intermediate ring 12 via the hook 11 in the rotational direction. Specifically, the first cam 15 that applies a pressing force to the hook 11 from the rear side is axially connected to the back frame 2F by the first connecting shaft 14A together with the first release plate 14. Specifically, the first connecting shaft 14A is connected to the first cam 15 and the first release plate 14 so as to be integral with each other in the rotational direction, and is rotatable with respect to the back frame 2F. It is connected to become. As a result, the first cam 15 and the first release plate 14 are integrally connected to each other in the rotational direction.

  The first cam 15 and the first release plate 14 are always illustrated with the first connecting shaft 14A as the center by the urging force of the tension spring 14D hooked between the first release plate 14 and the back frame 2F. It is urged to rotate clockwise. Due to this rotational biasing force, the first push projection 15A formed on the outer peripheral portion of the first cam 15 presses the engagement corner portion 11C formed on the tip end portion of the hook 11 in the rotation direction, thereby The protrusion 11B is pushed in the clockwise direction in the drawing from the rear side to be pushed into the recess 12A of the intermediate ring 12 and held. The first release plate 14 has an end portion of an operation cable 8A connected to the above-described walk-in lever 8 connected to a first long hole 14B formed at an edge portion on the left side of the drawing. Thereby, as shown in FIG. 6, the first release plate 14 is rotated in the clockwise direction in the figure against the urging force of the tension spring 14D when the walk-in lever 8 is operated. It has become. Then, by this rotation operation, the first pushing projection 15A of the first cam 15 is removed from the state of pressing the engaging corner portion 11C of the hook 11, and the release corner portion formed at the base portion of the hook 11 is removed. 11D is pressed in the rotationally operated direction, and the hook 11 is pushed in the counterclockwise direction in the drawing to be released from the engaged state with the intermediate ring 12.

  Returning to FIG. 3, a relay cable 8 </ b> B is connected to the first release plate 14 between the first release plate 14 and a direct release lever 16 that performs an unlocking operation of the reclining device 20 described later. The relay cable 8B has one end portion shown on the upper side in the drawing connected to a second elongated hole 14C formed on the left edge of the first release plate 14 in the drawing. The other end shown on the lower side is directly connected to a long hole 16A formed at the edge of the arm that extends rightward in the drawing of the release lever 16. Here, the direct release lever 16 is formed in an L-shape in which an arm extends in two directions, and its central portion is inserted through the operation shaft 26 of the reclining device 20 as shown in FIG. It is welded and fixed so as to be integrated in the rotation direction. As shown in FIG. 6, when the walk-in lever 8 is operated and the first release plate 14 is rotated in the clockwise direction in the relay cable 8B, the direct release lever 16 is moved in the clockwise direction in the figure. The operation shaft 26 is directly rotated by the release lever 16 and the locked state (rotation stopped state) of the reclining device 20 is released.

  Here, the configuration of the reclining device 20 will be described. The reclining device 20 used in the present embodiment has the same basic configuration as that of a known device disclosed in documents such as Japanese Patent Application Laid-Open Nos. 2002-360368 and 2005-321891. Yes. Therefore, only the outline of the configuration of the reclining device 20 will be briefly described below. As shown in FIG. 4, the reclining device 20 includes a disk-shaped ratchet 21 and a guide 22, a cylindrical outer ring 23, a rotating cam 24, a spring member 25, and an operation shaft 26. The ratchet 21 and the guide 22 are assembled so that they can rotate relative to each other, and are held in a state in which their outer peripheral portions are sandwiched by the outer peripheral ring 23 so that they do not come off in the axial direction. . The ratchet 21 is integrally welded and assembled to the outer side surface portion of the back frame 2F, and the guide 22 is integrally welded and assembled to the inner side surface portion of the base body 4. The rotating cam 24 is provided in a state of being rotatably supported by the shaft center portion of the guide 22, and the operation shaft 26 inserted through the shaft center portion is operated to rotate the shaft, A lock component (not shown) assembled in the gap between the ratchet 21 and the guide 22 is locked or released. Here, as shown in FIG. 2, the operation shaft 26 is integrally connected to the operation shaft 26 of the reclining device 20 on the other side by a rod 27, and the unlocking switching operation is performed synchronously. It has come to be.

  Returning to FIG. 4, the reclining device 20 always locks the relative rotation between the ratchet 21 and the guide 22 by the urging force of the spring member 25 hooked between the rotating cam 24 and the guide 22. Is held in a state where the seat back 2 is prevented from rotating relative to the base body 4. However, the locked state (rotation stopped state) of the reclining device 20 is released when the direct release lever 16 integrally connected to the operation shaft 26 is rotated by the pulling operation of the relay cable 8B described above. It has become. The reclining device 20 is returned to the locked state again by the urging force of the spring member 25 when the pulling operation state of the relay cable 8B is released.

  By the way, as shown in FIGS. 3 and 4, the intermediate ring 12 is operated to release the slide lock state of the slider device 30 that connects the seat body 1 shown in FIG. For this purpose, an operation cable 36 is connected. 3 and 4, the operation cable 36 is connected to the outer peripheral portion of the intermediate ring 12 by being rotatably connected to a pin, and the other end (not shown) is connected to the operation cable 36. However, it is connected to a slide lock mechanism (not shown) of the slider device 30 (see FIG. 1). Specifically, the operation cable 36 is routed so as to pass through the side surface portion of the back frame 2F, and the end portion of the guide tube 36A that guides the routing route is fixed to the side surface portion of the back frame 2F. Is provided. Thereby, as shown in FIG. 6, the operation cable 36 is disengaged from the engagement with the intermediate ring 12 by the operation of the walk-in lever 8, and the intermediate ring 12 is rotated to the base body 4 by the lock device 13. The end of the side connected to the intermediate ring 12 is pulled by the movement of the seat back 2 tilted forward in the stopped state (see FIG. 7), and the slide lock state of the slider device 30 is released. Yes.

  Here, returning to FIG. 1, the configuration of the slider device 30 described above will be described. The slider device 30 includes a slide rail 31 that is integrally fixed on the floor F, and a slider that is assembled to be slidable in the vehicle longitudinal direction with respect to the slide rail 31 and is integrally fixed to the bottom of the base body 4. 32 and a slide lock mechanism (not shown) that can lock the slide of the slider 32 with respect to the slide rail 31. The slide lock mechanism (not shown) is normally held in a state where the slide movement of the slider 32 is locked by urging, but by pulling up a pull-up operation lever 33 provided at the front lower portion of the seat cushion 3. The slide lock state is released. The operation lever 33 is also connected to the operation cable 36 connected to the intermediate ring 12 described above with reference to FIG. 3, and is also pulled up by operating the walk-in lever 8 and pulling the operation cable 36. The slide lock state of the slider device 30 is released.

  Therefore, by operating the walk-in lever 8, the hook 11 is disengaged from the intermediate ring 12, and the reclining device 20 is unlocked, so that the seat back 2 is moved to the forward tilt position shown in FIG. As shown in FIG. 1, the seat body 1 can be released as the slide lock state with respect to the floor F of the seat body 1 can be released by the pulling operation of the operation cable 36 accompanying the folding operation. The state in which the back 2 is switched to the forward leaning posture and can be retracted to the front side of the vehicle.

  Here, in the stopper structure for locking the forward tilting rotation of the seat back 2 to the forward tilt position shown in FIG. 7, the locking pin 2P provided integrally and directly fixed to the side surface portion of the back frame 2F, By abutting against the locking protrusion 12B of the intermediate ring 12 in a state in which the rotation is stopped by the locking device 13, the forward rotation of the seat back 2 is locked. Here, the locking pin 2P corresponds to the locking member of the present invention. As shown in FIG. 4, the locking pin 2P is inserted into a hole 2A penetratingly formed in the side surface of the back frame 2F from the inner side (left side in the drawing) in the seat width direction, and its head 2P1 is welded in a state of being applied to the inner side surface portion of the back frame 2F, thereby being firmly and integrally fixed to the back frame 2F.

  Incidentally, as shown in FIG. 1, the slider device 30 includes a tension spring that is hooked between a spring hooking portion 4 </ b> A formed on the base body 4 and a spring hooking portion 35 that is integrally provided on the slide rail 31. By the urging force of 34, the slider 32 is normally urged in the direction of sliding toward the vehicle front side with respect to the slide rail 31. Thus, the slider 32 is slid to the front side of the vehicle by the action of the urging force by releasing the slide lock state. Therefore, by operating the walk-in lever 8 described above, the seat back 2 is brought down to the forward tilt position shown in FIG. 7 by the urging force, and the slide lock state of the slider device 30 is released, so that the seat is released. The entire main body 1 is moved and operated forward of the vehicle by the action of the urging force.

  The seat back 2 that has been tilted to the forward tilted position by the operation of the walk-in lever 8 is operated to raise the seat back 2 to the rear side. The stored backrest angle position is returned to the original position. Hereinafter, the operation of each member of the memory device 10 when the seatback 2 is rotated forward or raised from the position where the seatback 2 is rotated forward will be described. As shown in FIG. 7, when the seat back 2 is operated by the walk-in lever 8 to release the hook 11 from the engaged state with the intermediate ring 12 and rotate forward, the protrusion 11 </ b> B of the hook 11 is moved. The intermediate ring 12 rides on the outer peripheral surface curved in an arc shape and moves while sliding on the outer peripheral surface. In the state in which the protrusion 11B of the hook 11 rides on the outer peripheral surface of the intermediate ring 12, even if the operation of the walk-in lever 8 is released and the pulling operation state of the operation cable 8A is released, the first cam 15 The movement to rotate counterclockwise in the figure by the urging force of the tension spring 14D is restricted by the second push projection 15B formed on the first cam 15 striking the engagement corner 11C of the hook 11. become. As a result, the first release plate 14 is held in a position in which the first release plate 14 is rotated clockwise with respect to the initial rotation position shown in FIG. 3, and the relay connected to the first release plate 14. The cable 8B is kept in the pulled state, and the locked state of the reclining device 20 is kept in the released state.

  Accordingly, after the seat back 2 is tilted to the forward tilt position shown in FIG. 7, the seat back 2 is raised from this state to the rear side, so that the protrusion 11B of the hook 11 is raised even during the raising. Moves while sliding on the outer peripheral surface of the intermediate ring 12, the locked state of the reclining device 20 is maintained in the released state. However, as shown in FIG. 3, the seat back 2 is raised to a position where the projection 11 </ b> B reaches the recess 12 </ b> A of the intermediate ring 12, so that the projection 11 </ b> B is recessed by the urging force applied to the hook 11. The first cam 15 and the first release plate 14 are returned to the initial rotational position before the walk-in operation, and the reclining device 20 is returned to the locked state. As a result, the seat back 2 is returned to the stored backrest angle position before being tilted to the forward tilt position. That is, the seat back 2 is configured such that the locked state of the reclining device 20 is released when the hook 11 is not raised to a position where it engages with the intermediate ring 12. Accordingly, the position at which the hook 11 engages with the intermediate ring 12 is set as a stored backrest angle position before the seat back 2 is brought down to the forward tilt position, and this backrest angle position is set as a tilt down described later. Even if the rotational position of the intermediate ring 12 with respect to the base body 4 is changed by adjusting the backrest angle of the seat back 2 back and forth by operating the lever 9, the seat back 2 is always in the middle after the walk-in operation. The ring 12 can be raised up to a position where the projection 11B of the hook 11 reaches the position where the recess 12A of the ring 12 is located (a position before the forward tilt).

  Next, returning to FIG. 3, the configuration of the lock device 13 that stops the rotation of the intermediate ring 12 with respect to the base body 4 will be described. The locking device 13 includes an engagement tooth member 13A having an engagement tooth 13A2 that can engage with an engagement tooth 12C formed on the outer peripheral portion of the intermediate ring 12, and an engagement tooth member 13A. It has the 2nd cam 13B operated so that it may press and engage with the engagement tooth 12C, and the 2nd release plate 13C which rotates the 2nd cam 13B. Here, the second cam 13B corresponds to the cam of the present invention. The engaging tooth member 13A is rotatably connected to the base body 4 by a connecting shaft 13A1. The second cam 13B is disposed at a lower position in the drawing than the engaging tooth member 13A, and is rotatably connected to the base body 4 by the second connecting shaft 13C1 together with the second release plate 13C. Specifically, the second connecting shaft 13C1 is connected to the second cam 13B and the second release plate 13C so as to be integral with each other in the rotational direction, and is rotatable with respect to the base body 4. It is connected to become. As a result, the second cam 13B and the second release plate 13C are integrally connected to each other in the rotational direction.

  The second cam 13B and the second release plate 13C are normally shown around the second connecting shaft 13C1 by the urging force of the torsion spring 13C3 hooked between the second connecting shaft 13C1 and the base body 4. It is urged to rotate clockwise. Due to this rotational urging force, the pushing protrusion 13B1 formed on the outer peripheral portion of the second cam 13B presses the engaging tooth member 13A from the back side, and the engaging tooth member 13A is shown counterclockwise with the connecting shaft 13A1 as the center. The engaging tooth 13A2 is pushed in the turning direction and is held in a state of being pressed against the engaged tooth 12C of the intermediate ring 12. Here, the tooth surface of the engaged tooth 12C is formed over a wider region in the circumferential direction (rotating direction) than the tooth surface of the engaging tooth 13A2 formed on the engaging tooth member 13A. Even if the intermediate ring 12 is rotated with respect to the engaging tooth member 13A by the movement of adjusting the backrest angle of the seat back 2 by the operation of the tilt down lever 9 which will be described later, the engaging teeth at each of the rotated positions. The member 13A can be engaged. The second release plate 13C has an arm portion extending downward in the figure of the indirect release lever 17 connected to the operation shaft 26 of the reclining device 20 in a through hole 13C2 formed in the upper edge in the figure. The operation pin 17B connected to the lower end is inserted and connected in a slidable state.

  The indirect release lever 17 has an L-shaped arm extending in two directions. As shown in FIG. 4, the central portion thereof is rotatable with respect to the operation shaft 26 of the reclining device 20. It is provided with shaft connection. As shown in FIG. 3, the indirect release lever 17 has a torsion spring 17C hooked between the spring hooking portion 4B of the base body 4 and is normally centered on the operating shaft 26 by the urging force of the torsion spring 17C. In FIG. 2, the rotation is biased counterclockwise. Due to this rotational biasing force, the indirect release lever 17 normally rotates the second release plate 13C around the second connecting shaft 13C1 in the clockwise direction via the operation pin 17B connected to the lower end of the figure. The engaging tooth member 13A is pressed against the intermediate ring 12 via the second cam 13B described above and held in the engaged state.

  The indirect release lever 17 is connected to the end portion of the operation cable 9A connected to the tilt-down lever 9 in a long hole 17A formed at the edge of the arm portion extending rightward in the drawing. ing. As a result, as shown in FIG. 5, the indirect release lever 17 is rotated in the clockwise direction in the figure against the urging force of the torsion spring 17C when the tilt down lever 9 is operated. ing. Then, by this rotation operation, the operation pin 17B of the indirect release lever 17 slides in the through hole 13C2 of the second release plate 13C, and the second release plate 13C is counterclockwise counteracted against the urging force of the torsion spring 13C3. And the pushing protrusion 13B1 of the second cam 13B presses the leg portion 13A3 of the engaging tooth member 13A in the rotationally operated direction, thereby releasing the engaging tooth member 13A from the meshed state with the intermediate ring 12. . At this time, the indirect release lever 17 pushes the arm portion extending directly downward in the figure of the release lever 16 in the same direction by the operation pin 17B in accordance with the rotation operation rotated in the counterclockwise direction in the figure. The locked state of the reclining device 20 is also released.

  Accordingly, the operation of the tilt down lever 9 releases the rotation stop state of the intermediate ring 12 by the engaging tooth member 13A of the lock device 13 and the lock state of the reclining device 20 together. By rotating the seat back 2 forward and backward, as shown in FIG. 8, the seat back 2 rotates forward while pulling together the intermediate ring 12 engaged with the hook 11. Therefore, at this time, since the seat back 2 and the intermediate ring 12 are rotated together and tilted forward, the locking pin provided on the back frame 2F as in the operation of the walk-in lever 8 described above is used. Since the movement of 2P abutting and engaging with the engaging protrusion 12B of the intermediate ring 12 does not occur, the seat back 2 is largely tilted over the forwardly inclined position shown in FIG. 7 (position shown in FIG. 8). Is greatly defeated. Further, as shown in FIG. 5, from the state where the seat back 2 is used as a backrest, the tilt down lever 9 is operated to move the tilt angle of the seat back 2 back and forth. By adjusting, the intermediate ring 12 is rotated by the hook 11 so as to follow the movement of the seat back 2. Therefore, by stopping the operation of the tilt-down lever 9 at the position where the backrest angle of the seat back 2 is adjusted and returning the engagement tooth member 13A of the lock device 13 to the state engaged with the intermediate ring 12, the intermediate ring 12 is The rotation is stopped at a rotational position following the movement of the seat back 2. Therefore, regardless of the position at which the backrest angle of the seat back 2 is adjusted, the intermediate ring 12 is always maintained in a state in which the rotation direction with respect to the seat back 2 is constant.

  By the way, the locking projection 12B formed on the outer peripheral portion of the intermediate ring 12 that functions as a stopper when the walk-in lever 8 is operated projects from the outer peripheral portion of the intermediate ring 12 outward in the radial direction. Since the width in the rotation direction is long in the circumferential direction, the structure strength is increased. Specifically, the engagement protrusion 12B has an arrangement in the rotation direction that overlaps with the engagement tooth member 13A of the lock device 13 by the operation in which the intermediate ring 12 tilts the seat back 2 to the large tilt position shown in FIG. It is the shape extended to the position which will be in the state. However, the locking projection 12B has a shape having an inclined portion 12B1 in which the amount of protrusion in the radial direction decreases toward the distal end portion where the engagement tooth member 13A of the locking device 13 and the arrangement in the rotation direction overlap. Therefore, the interference with the engaging tooth member 13A is avoided.

  As described above, according to the vehicle seat of the present embodiment, the hook 11 (engagement member) constituting the memory device 10 is removed from the recess 12A when the seat back 2 is stopped halfway, and the intermediate ring 12 ( The member is released from the engaged state with the member to be engaged, and rotates forward with the seat back 2 while leaving the intermediate ring 12. The forward tilt rotation of the seat back 2 is performed by a locking pin 2P (locking member) provided directly and integrally with the skeleton (back frame 2F) of the seat back 2 separately from the hook 11. The locking device 13 is locked at the forward inclined position by hitting the locking protrusion 12B of the intermediate ring 12 which is in a state of being rotationally stopped by the base body 4. As described above, the hook 11 is configured such that the forward rotation of the seat back 2 is locked at the forward tilt position by the locking pin 2P provided integrally and directly fixed to the skeleton of the seat back 2. Compared with the configuration in which such a movable member functions as the locking pin 2P, the seat back 2 can be locked at the set forward tilt position with high accuracy. In addition, since the locking pin 2P is provided as a dedicated part for the stopper and directly fixed to the skeleton of the seat back 2 separately from the hook 11, the locking pin 2P is independent of the arrangement of the hook 11, Since the position can be set freely, the forward tilt position can be easily changed simply by changing the setting position of the locking pin 2P.

  Further, the inclined portion 12B1 is formed so that the protruding amount in the radial direction becomes smaller toward the front end side portion where the arrangement is overlapped so that the locking projection 12B can avoid the interference with the locking device 13 when the seat back 2 is largely tilted. By having the shape, it is possible to increase the structural strength of the locking projection 12B so as not to interfere with the locking device 13. Further, the locking device 13 is configured to press the engagement tooth member 13A from the back side by the second cam 13B and press the engagement tooth member 13A against the outer peripheral portion of the intermediate ring 12 so as to be engaged with each other. The locking strength of the intermediate ring 12 by the tooth member 13A can be increased.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, in the above-described embodiment, the memory device is configured such that the hook 11 and the lock device 13 are engaged with and disengaged from the intermediate ring 12 by rotational motion. However, these members are engaged and disengaged in other motion forms such as linear motion. You may do. Further, the structure in which the rotation of the intermediate ring is stopped by the lock device may be of a type in which the rotation is stopped by friction in addition to the type in which the rotation is stopped by meshing as shown in the above embodiment.

1 Seat body 2 Seat back 2F Back frame (framework)
2A hole 2P locking pin (locking member)
2P1 Head 3 Seat cushion 3F Cushion frame 4 Base body 4A Spring hook 4B Spring hook 5 Rear link 6 Front link 8 Walk-in lever 8A Operation cable 8B Relay cable 9 Tilt down lever 9A Operation cable 10 Memory device 11 Hook Joint material)
11A Connecting shaft 11B Projection 11C Engagement angle 11D Release angle 12 Intermediate ring (engaged member)
12A Concave portion 12B Locking projection 12B1 Inclined portion 12C Engagement tooth 13 Lock device 13A Engagement tooth member 13A1 Connection shaft 13A2 Engagement tooth 13A3 Leg portion 13B Second cam (cam)
13B1 push projection 13C second release plate 13C1 second connecting shaft 13C2 through hole 13C3 torsion spring 14 first release plate 14A first connecting shaft 14B first long hole 14C second long hole 14D tension spring 15 first cam 15A first push Projection 15B Second push projection 16 Direct release lever 16A Long hole 17 Indirect release lever 17A Long hole 17B Operation pin 17C Torsion spring 20 Recliner 20R Rotation center 21 Ratchet 22 Guide 23 Outer ring 24 Rotation cam 25 Spring member 26 Operation shaft 27 Rod 30 Slider device 31 Slide rail 32 Slider 33 Operation lever 34 Tension spring 35 Spring hook 36 Operation cable 36A Guide tube F Floor

Claims (3)

A backrest angle before performing a halfway stop operation that tilts the seat back to the forward tilt position and a large tilt operation that tilts the seat back to the forward tilt position beyond the forward tilt position. And a vehicle seat provided with a memory device that guides the seat back so that the seat back is raised up to a stored back angle position after a halfway stop operation,
The seat back is connected to the base body on the floor via a reclining device that functions as a rotation shaft device that can stop rotation, and is always held in a state where the backrest angle is fixed. The fixed state of the backrest angle is solved during the tilting operation,
The memory device includes an engagement member provided on the seat back, an engaged member provided rotatably on the base body, and a lock capable of locking the rotation of the engaged member relative to the base body. And the engaging member is normally integrated into the seat back in the rotational direction by entering the recess formed in the outer peripheral portion of the engaged member by an urging force. It is held in the engaged state, but when it is stopped halfway, it is removed from the recess so that it can be rotated forward with the seat back leaving the engaged member. Normally, the lock device is held in a state of being prevented from rotating with respect to the base body, but at the time of a large-turning operation, the anti-rotation state by the lock device is released and is pulled forward by the engaging member. And adapted to rotate falling forward together with the seat back,
In addition to the engaging member, a stopper structure for locking the seat back to the forward tilt position during a halfway stop operation is directly and integrally fixed to the skeleton of the seat back. A vehicle seat characterized in that the vehicle seat is configured to be locked by hitting a locking protrusion formed on the engaging member. The vehicle seat according to claim 1,
The locking device is configured to engage with the outer peripheral portion of the engaged member to lock the rotation of the engaged member, and the locking protrusion has a radius from above the outer peripheral portion of the engaged member. The locking device and the rotation direction of each other overlap with each other when the engaged member rotates to the position where it is greatly tilted together with the seat back at the time of operation. In the radial direction toward the distal end portion where the locking device and the arrangement in the rotation direction overlap each other, the structure strength is enhanced by extending to the position where the state becomes the state. A vehicle seat characterized in that interference with the locking device is avoided by having an inclined shape with a small overhang amount. The vehicle seat according to claim 1 or 2,
In the lock device, an engagement tooth member having engagement teeth that can mesh with an engagement tooth formed on an outer peripheral portion of the engagement member is pressed from the back side by rotation of a cam and the engagement device is engaged. A vehicular seat having a structure in which a tooth is held in a state of being pressed against the engaged tooth and held in a state in which rotation of the engaged member is locked.

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