JP6033666B2 - Vehicle seat lock device - Google Patents

Description

  The present invention relates to a vehicle seat lock device that is provided on a seat back of a vehicle and fixes and holds the seat back to a vehicle body side member.

  2. Description of the Related Art Conventionally, in a vehicle seat lock device, a striker in which first and second engagement shafts are juxtaposed along a seat back raising / lowering direction on a vehicle body side is fixed as in Patent Document 1, for example. One having a lock assembly attached to the back side is known. The lock assembly selectively engages with the first and second engaging shafts of the striker to hold the seat back in the first standing position and the second standing position inclined to the first standing position. It has a member.

  When the seat back is held in the first standing position, the first engagement shaft of the striker is engaged with the first engagement groove of the hook member, and when the seat back is held in the second standing position, the striker's first engagement shaft is engaged. The two engagement shafts engage with the first engagement groove of the hook member, and the first engagement shaft of the striker is loosely fitted into the second engagement groove of the hook member.

  Further, the hook member is urged to rotate in the engaging direction by a spring member. Further, when the seat back is displaced backward from the front lying position to the first standing position (when locked), the striker first engaging shaft is brought into contact with the outer edge of the hook member and is biased by the spring member. The hook member is displaced upward to be displaced to the first standing position.

  When the seatback is displaced forward from the first standing position or the second standing position to the lying position (when unlocked), the hook member is rotated upward by the operation knob, and the striker engagement shaft is moved. It is possible to disengage from the engaging groove of the hook member, and in this state, the seat back is moved down and moved forward.

JP 2007-196717 A

  However, in the vehicle seat lock device disclosed in Patent Document 1, when the seat back is held in the upright position (when locked), the hook member rotates upward when vertical vibrations occur due to vibrations of the vehicle body or the like. There is a risk of accidentally leaving the striker. Further, if a restraining member is provided separately to suppress this, it is not preferable because it may increase the weight and cost.

  The present invention has been made in view of such points, and the object of the present invention is to move upward of the hook member without providing another member in a state where the seat back is held in the standing position (when locked). An object of the present invention is to provide a vehicle seat lock device that can prevent the rotation of the vehicle and maintain the locked state with certainty.

  In order to achieve the above object, the present invention is characterized in that a device for effectively suppressing the movement of the hook member using an existing member in the vehicle seat lock device is provided.

  Specifically, the first invention is a vehicle seat capable of holding a seat back supported by a vehicle body so as to be able to rise and fall in a first standing position and a second standing position tilted with respect to the first standing position. A locking device, which is fixed to the vehicle body side, and includes a first engagement shaft and a second engagement shaft positioned on a tilt side with respect to the first engagement shaft along a tilting direction of the seat back. A striker installed on the seat back side, and a lock assembly into which the striker enters and engages. The lock assembly includes a base plate fixed to the seat back, and a base portion horizontally to the base plate. And a hook member rotatably supported with a direction axis. The hook member engages with the first engagement shaft of the striker when the seat back is held in the first standing position, while the second engagement shaft is held when the seat back is held in the second standing position. A first engagement groove that engages with the first engagement groove, and the first engagement shaft is loosely fitted when the seatback is held in the second upright position and is positioned closer to the striker entry direction than the first engagement groove. The second engaging groove is arranged in parallel along the direction in which the striker enters. The lock assembly includes an assist member whose base is rotatably supported by the base plate with a horizontal axis, and a base that is rotatably supported by the base plate with a horizontal axis. And a lever member that rotates to rotate the hook member in the unlocking direction in which the engagement between the first engagement groove and the first or second engagement shaft of the striker is released. The assist member is in contact with the first engagement shaft of the striker, and in contact with the hook member in a state where the striker has not entered the lock assembly. A restricting portion for restricting the hook member from rotating in a locking direction in which the groove engages with the first or second engaging shaft of the striker is formed, and the abutting portion of the assist member has the contact portion of the striker It is urged to go in the opposite direction. Then, when the first or second engagement shaft of the striker is engaged with the first engagement groove of the hook member, the hook member rotates in the unlocking direction. A deterrence part for deterring is formed.

In the first aspect of the present invention, the first spring member that urges the hook member to rotate in the locking direction and the lever member are urged to rotate so that the deterring portion is directed in the counter-entry direction of the striker. The second spring member is provided, and the rotational biasing force of the first spring member is weaker than the rotational biasing force of the second spring member.

In a second aspect based on the first aspect , the hook member includes a shaft portion provided so as to protrude toward the base plate, and the restraining portion of the lever member is a first engagement of the hook member. When the first or second engagement shaft of the striker is engaged with the groove, the hook member is configured to abut against the shaft portion and prevent the hook member from rotating in the unlocking direction. It is characterized by.

In a third aspect based on the second aspect , the lock assembly includes an auxiliary hook member having a base supported coaxially and rotatably with the hook member between the hook member and the base plate. The auxiliary hook member includes a pin portion provided so as to protrude toward the base plate side, and a long hole in which the shaft portion of the hook member is movably accommodated, and the hook member has a first engagement. When releasing the state in which the first or second engagement shaft of the striker is engaged with the groove, the lever member is rotated so that the inhibition portion moves in the entry direction of the striker. By engaging the pin portion of the auxiliary hook member, the auxiliary hook member is rotated in a direction away from the striker, and the auxiliary hook member is rotated by the rotation of the auxiliary hook member. The ends of the slots is brought into contact with the shaft portion of the hook member, characterized in that it is configured to rotate the hook member to the unlocked direction.

  In the first invention, the lock assembly includes a base member, a hook member, an assist member, and a lever member. Then, the lever member is rotated by an external operation, and the hook member is rotated in the unlocking direction. Further, when the first or second engagement shaft of the striker is engaged with the first engagement groove of the hook member (when locked), the hook member rotates in the unlocking direction. The deterrence part which deters is formed. That is, the lever member has not only the original function of rotating the hook member in the unlocking direction when unlocking but also the function of preventing the hook member from rotating in the unlocking direction when locking.

  Therefore, the hook member can be prevented from rotating in the unlocking direction without increasing the number of parts, so that the locked state can be reliably maintained without increasing the weight and cost.

The first invention further includes a first spring member that urges the hook member to rotate in the locking direction, and a second spring member that urges the lever member to rotate so that the restraining portion faces in the counter-entry direction of the striker. And the rotation biasing force of the first spring member is weaker than the rotation biasing force of the second spring member. In other words, when the lock is released, the first biasing member provided on the hook member that is rotated by the rotation of the lever member is more effective than the rotation biasing force of the second spring member that is provided on the lever member that is initially rotated by an external operation. The rotational biasing force of one spring member is weak.

  Therefore, when the movement of the lever member is transmitted to the hook member and the hook member is rotated, the second spring member having a strong rotation biasing force resists each biasing force of the first spring member having a weak biasing force. Then, the lever member and the hook member are rotated, and compared with the reverse case, it is possible to prevent the operation load from rising suddenly in the middle, so that the operability at the time of unlocking can be improved.

In the second invention, when the first engagement shaft or the second engagement shaft of the striker is engaged with the first engagement groove of the hook member, the lever member is restrained on the shaft portion provided on the hook member. Since the portions abut and prevent the hook member from rotating in the unlocking direction, the hook member can be reliably prevented from rotating in the unlocking direction.

In the third invention, at the time of unlocking, the lever member is rotated by an operation from the outside, the rotation operation is transmitted to the auxiliary hook member, the auxiliary hook member is rotated, and the auxiliary hook member is rotated. Is transmitted to the hook member so that the hook member rotates. At this time, if the auxiliary hook member is formed so as to be lighter than the hook member, the turning operation of the lever member is first transmitted to the auxiliary hook member that is lighter than the hook member. Therefore, since the load required for the rotation from the lever member to the hook member at the time of unlocking can be switched more smoothly, the operability can be improved.

It is a perspective view of the rear seat for vehicles to which the present invention is applied. It is a disassembled perspective view of the lock assembly concerning the embodiment of the present invention. In embodiment of this invention, it is operation | movement explanatory drawing which shows typically operation | movement of the principal part when raising a seat back from a lying position. In embodiment of this invention, it is operation | movement explanatory drawing which shows typically operation | movement of the principal part when a seat back is in a locked state in the 1st standing position. In embodiment of this invention, it is operation | movement explanatory drawing which shows typically operation | movement of the principal part when a seat back is in a lock release state in a 2nd standing position. In embodiment of this invention, it is operation | movement explanatory drawing which shows typically operation | movement of the principal part when a seat back is in a locked state in the 1st standing position.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiment is merely illustrative in nature.

  In the following description, the lower left diagonal in FIG. 1 is “vehicle front”, the upper right upper is “vehicle rear”, the upper left upper is “vehicle right side”, and the lower right lower is “vehicle left side”. . The left side in FIG. 3 is referred to as “a striker approach direction” (hereinafter, simply referred to as “entry direction”), and the right side is referred to as a “strike counter approach direction” (hereinafter, simply referred to as “counter approach direction”). In FIG. 2, the diagonally upper left is defined as “entry direction”, the diagonally lower right is defined as “anti-entry direction”, the diagonally lower left is defined as “front side”, and the diagonally upper right is defined as “back side”. 1 and FIGS. 2 to 6, “vehicle front” in FIG. 1 is “entry direction” in FIGS. 2 to 6, and “vehicle rear” in FIG. 1 is “anti-entry” in FIGS. 2 to 6. The “vehicle left side” in FIG. 1 is the “front side” in FIG. 2, and the “vehicle right side” in FIG. 1 is the “back side” in FIG. The “unlocked state” refers to a state where the seat back 3 is not raised and is not locked, and the “unlocked state” refers to a state where the seat back 3 is in the standing position and is unlocked. Say. The “locked state” means a state in which the seat back 3 is locked at the standing position.

  FIG. 1 shows a vehicle rear seat 1 to which the present invention is applied. The vehicle rear seat 1 is supported by a seat cushion 2 installed on the vehicle body floor and a vehicle body positioned on the rear side of the seat cushion 2 so as to be able to tilt in the front-rear direction by a hinge shaft (not shown) that faces in the left-right direction. And a seat back 3.

  As shown in FIG. 1, the seat back 3 is a side end face on the left side of the vehicle, and is fixed to a lock assembly R that is embedded in a position below the shoulder, and a vehicle body panel (not shown) side. By being engaged with the metal striker 4, it can be held in the first standing position shown by a solid line in FIG. 1 and the second standing position shown by a two-dot chain line inclined backward from the first standing position. Based on the operation of the operating means 20 provided on the shoulder portion of the seat back 3, it is possible to move forward to the lying position indicated by the alternate long and short dash line that falls forward.

  The striker 4 is fixed to a vehicle body panel (not shown) facing the side end surface of the seat back 3 and has a substantially U-shape in plan view protruding from the vehicle body side wall (not shown) to the right side of the vehicle. A first engagement shaft 41 extending in the horizontal direction positioned in front and a second engagement shaft 42 in the rear of the vehicle extending in the horizontal direction positioned on the tilt side with respect to the first engagement shaft 41 are provided.

  As shown in FIG. 3 to FIG. 6, the operating means 20 is disposed on the shoulder portion of the seat back 3 and is slidable in the vertical direction within the frame portion 21 and a frame portion 21 having a rectangular tube shape in the vertical direction. And an operation knob 22 to be accommodated. As will be described later, the operating means 20 and the lock assembly R are connected by an operating rod 30.

  As shown in FIG. 2, the lock assembly R is fixed to a metal plate that is fixed to the seat back 3 with bolts or the like (not shown) and is opposed to the front side of the base plate 5. And a cover plate 6 made of a substantially U-shaped cross section. At the approximate center in the vertical direction of the base plate 5 and the cover plate 6, the anti-entry direction side is so that the first and second engaging shafts 41, 42 of the striker 4 can enter from the rear of the vehicle when the seat back 3 is raised. An open entry groove 51 is formed in a cutout shape. An accommodation space S is formed between the base plate 5 and the cover plate 6.

In the accommodation space S between the base plate 5 and the cover plate 6, the hook member 7 that engages with the engagement shaft of the striker 4, the hook member 7 is held, and the movement of the seat back 3 to the lying down position is assisted. The assist member 9, the auxiliary hook member 8 for assisting the rotation of the hook member 7 when the seat back 3 is brought into the unlocked state, and the operation based on the operation of the operation means 20 (see FIG. 3) are applied to the auxiliary hook member 8. A lever member 10 for transmitting is arranged.

  On the surface of the base plate 5 facing the cover plate 6, there are a first pivot 52 located on the back side of the entry groove 51 in FIG. 2, a second pivot 53 located above the first pivot 52, A third pivot 54 located below the first pivot 52 protrudes from the first pivot 52, and these pivots extend in the horizontal direction from the back side toward the near side in the accommodation space S.

  The hook member 7 is made of a metal plate-like member, and has a hook base 71 on the lower left side in FIG. The hook base 71 is rotatably supported by the first pivot 52 of the base plate 5, and the hook member 7 is locked by a first spring 11 (first spring member) wound around the first pivot 52. Is urged to rotate in the Y direction (clockwise as viewed from the front side). The biasing force of the first spring 11 is set to be smaller than the biasing force of a fourth spring 14 (second spring member) described later. Further, on the right (counter approach direction) side of the hook member 7 in FIG. 2, a notch-shaped first engagement with which the first engagement shaft 41 and the second engagement shaft 42 of the striker 4 can be selectively engaged. A groove 72 is formed with the opening facing downward. A notch-like second engagement groove 73 into which the first engagement shaft 41 of the striker 4 can be loosely fitted is formed on the side closer to the hook base 71 than the first engagement groove 72 with the opening facing downward. . Between the first engagement groove 72 and the second engagement groove 73, a protrusion 74 that can come into contact with a restriction portion 93 of the assist member 9 described later is provided so as to protrude downward. On the upper edge of the hook member 7 and above the second engagement groove 73, a protrusion 75 that can contact a receiving portion 103 of the lever member 10 to be described later is formed to project in a mountain shape. Further, above the second engagement groove 73 of the hook member 7, it protrudes toward the back side (base plate 5 side), can come into contact with the restraining portion 102 of the lever member 10 described later, and the auxiliary hook member 8 described later. A shaft portion 76 that is movable in the long hole 84 is provided.

  The auxiliary hook member 8 is made of a metal plate-like member that is lighter than the hook member 7, and is provided between the hook member 7 and the base plate 5. The auxiliary hook member 8 has an auxiliary hook base 81 on the lower left side in FIG. The auxiliary hook base 81 is rotatably supported on the first pivot 52 of the base plate 5. The auxiliary hook member 8 is urged to rotate in the Y direction in FIG. 2 (clockwise as viewed from the front side) by the second spring 12 wound around the first pivot 52. The auxiliary hook member 8 is formed with an extending portion 82 extending downward to the right (counter approach direction) side of the auxiliary hook base portion 81 in FIG. The extending portion 82 is formed so as to protrude in substantially the same shape as the protruding portion 74 of the hook member 7. Further, the vehicle rear side outer edge 8a of the extending portion 82 is formed so as to extend in the counter approaching direction (away from the first pivot axis 52) from the arc surface centered on the first pivot axis 52 as it goes upward. Between the auxiliary hook base portion 81 and the extending portion 82, an auxiliary engagement groove 83 having substantially the same shape as the second engagement groove 73 of the hook member 7 is formed with the opening facing downward. Above the auxiliary engagement groove 83, a long hole 84 in which the shaft portion 76 of the hook member 7 is relatively movable is formed so as to extend along an arc centered on the first pivot 52. Further, on the left side in FIG. 2 above the long hole 84, a pin portion 85 is provided which protrudes to the back side (base plate 5 side) and can be engaged with a restraining portion 102 of the lever member 10 described later.

The assist member 9 is made of a metal plate-like member, and has an assist base 91 on the lower side in FIG. The assist base 91 is rotatably supported on the third pivot 54 of the base plate 5. The assist member 9 is urged to rotate in the X direction of FIG. 2 (clockwise as viewed from the front side) by the third spring 13 wound around the third pivot 54. The assist member 9 has a contact portion 92 that can contact the first engagement shaft 41 of the striker 4 and a restriction portion 93 that can contact the protruding portion 74 of the hook member 7 at the top. It is formed to come out. The tip of the restricting portion 93 is bent at the back side so that when the tip of the restricting portion 93 comes into contact with the protruding portion 74 of the hook member 7, the hook member 7 can be stably held in an unlocked state. It has become. In addition, the front end of the restricting portion 93 may be bent toward the front side, or may be shaped so as not to be bent in either case.

  The lever member 10 is made of a metal plate-like member, and has a lever base 101 on the upper left side in FIG. The lever base 101 is rotatably supported on the second pivot 53 of the base plate 5. The lever member 10 is urged to rotate in the Z direction in FIG. 2 (clockwise as viewed from the front side) by a fourth spring 14 wound around the second pivot 53. The lever member 10 has a restraining portion below the lever base portion 101, the lower end 102 a being able to contact the shaft portion 76 of the hook member 7, and the side surface 102 b on the entry direction side being engageable with the pin portion 85 of the auxiliary hook member 8. 102 and the receiving part 103 which can contact | abut to the projection part 75 of the hook member 7 are formed so that it may be divided into two and extended. The receiving portion 103 is bent so as to form a stepped shape that is bent downward toward the front side (auxiliary hook member 8 side) in FIG. 2 so as to exceed the auxiliary hook member 8 with respect to the lever base portion 101. Thus, it can come into contact with the protrusion 75 of the hook member 7 while avoiding interference with the auxiliary hook member 8. Further, as shown in FIG. 3, the receiving portion 103 is formed in a bent shape so as to form a dogleg shape in a plan view. As shown in FIGS. 3 to 6, a connecting hole 104 connected to the operating means 20 via the operating rod 30 is formed at the upper end of the lever member 10.

  Next, the operation state of the main part in the embodiment will be described with reference to FIGS. For convenience of explanation, it is assumed that the cover plate 6 is removed.

  First, an operation state when the seat back 3 is raised from the lying position will be described with reference to FIG.

  As shown in FIG. 3, when the seat back 3 is in the lying position, the assist member 9 is urged to rotate in the X direction by the third spring 13 wound around the third pivot 54. The biasing force of the third spring 13 is set so that the assist member 9 is maintained at a predetermined position.

  The hook member 7 is urged to rotate in the Y direction by the first spring 11 wound around the first pivot 52, but is formed between the first engagement groove 72 and the second engagement groove 73. Since the projecting portion 74 is in contact with the restricting portion 93 of the assist member 9 maintained at the predetermined position, the rotation in the Y direction is restricted, so that the vehicle rear side lower end 7a moves the striker 4 It is held above the locus L (the locus drawn by the axial centers of the first and second engaging shafts 41 and 42).

  The auxiliary hook member 8 is rotationally biased in the Y direction by the second spring 12 wound around the first pivot shaft 52, but the upper end surface 84 a of the elongated hole 84 abuts on the shaft portion 76 of the hook member 7. In place. At this time, the tip of the extension portion 82 of the auxiliary hook member 8 is positioned below the lower edge 51 a of the entry groove 51 formed in the base plate 5.

  The lever member 10 is urged to rotate in the Z direction by the fourth spring 14 wound around the second pivot 53. However, since the receiving portion 103 is in contact with the protrusion 75 of the hook member 7, It is in a state rotated in the Z direction. Since the turning motion of the lever member 10 is transmitted to the operation knob 22 via the operation rod 30, the operation knob 22 is slid downward. That is, when the seat back 3 is in the lying position, as shown in FIG. 3, the operation knob 22 slides downward from the frame upper surface 21a in the frame 21 of the operation means 20, and the frame inner surface 21b is exposed. (The state in which the upper surface 22a of the operation knob 22 is lowered in the frame portion 21). Thereby, the occupant can recognize that the vehicle is unlocked.

When the seat back 3 is rotated backward from the lying position and stood up, as shown in FIG. 3, the striker 4 relatively enters the entry groove 51 of the base plate 5, and the first engagement shaft 41 is the assist member. 9 abuts on the abutment portion 92. Since the assist member 9 is rotatably supported by the third pivot 54 while being urged to rotate by the third spring 13, the impact force caused by the contact of the striker 4 can be reduced, and the buffering sound can be reduced. Can be reduced. If the striker 4 is further advanced in the approach direction (front of the vehicle) while the contact portion 92 and the first engagement shaft 41 are in contact with each other, the assist member 9 resists biasing by the third spring 13. By rotating in the anti-X direction, the contact state between the restricting portion 93 of the assist member 9 and the protruding portion 74 of the hook member 7 is released. At the same time, the first engagement shaft 41 of the striker 4 abuts against the vehicle rear side lower end 7a of the hook member 7 to slightly lift the hook member 7, and the first engagement shaft 41 is a first engagement groove of the hook member 7. Enter 72. As shown by a two-dot chain line in FIG. 3, the first engagement shaft 41 comes into contact with the extending portion 82 of the auxiliary hook member 8 and stops entering in the entering direction. Therefore, even when the striker 4 is vigorously entered, the first engagement shaft 41 can be prevented from entering the second engagement groove 73 beyond the protrusion 74 of the hook member 7.

  Next, the operation state when the seat back 3 is locked at the first standing position will be described with reference to FIG.

  When the first engagement shaft 41 enters the first engagement groove 72 of the hook member 7, the hook member 7 is rotated in the Y direction (lock direction) by the rotation biasing force of the first spring 11. At the same time, the shaft portion 76 provided in the hook member 7 moves in the Y direction from above in the elongated hole 84 formed in the auxiliary hook member 8. Further, the lever member 10 is released from the contact between the receiving portion 103 and the protrusion 75 of the hook member, and rotates in the Z direction. As shown in FIG. 4, when the hook member 7 is rotated in the Y direction, the first engagement shaft 41 of the striker 4 and the first engagement groove 72 of the hook member 7 are engaged, and the seat back 3 is It is securely and stably held in the first standing position. The auxiliary hook member 8 is urged in the Y direction, and the vehicle rear side (anti-entry direction) side of the arcuate surface centering on the first pivot 52 as the vehicle rear side outer edge 8a of the extending portion 82 goes upward. It is formed to spread. Therefore, the first engagement shaft 41 of the striker 4 is pressed in the counter approaching direction (rear of the vehicle) by the extending portion 82 of the auxiliary hook member 8. Further, the abutting portion 92 of the assist member 9 biased in the X direction is also pressed in the counter approaching direction (rear of the vehicle). Therefore, the first engagement shaft 41 of the striker 4 is sandwiched between the extension portion pressing surface 82b and the contact portion pressing surface 92a and the anti-entry direction surface 72a (vehicle rear surface) of the first engagement groove 72. As a result, rattling is prevented. Thereby, the seat back 3 is securely and stably held at the first standing position.

  At this time, the shaft portion 76 provided on the hook member 7 can come into contact with the lower end 102 a of the restraining portion 102 in the lever member 10. For this reason, even if the hook member 7 is rotated upward (in the anti-Y direction), which is the unlocking direction, due to the vibration or impact of the vehicle and tries to disengage from the first engagement shaft 41 of the striker 4, the shaft portion of the hook member Only comes into contact with the lower end 102a of the restraining portion 102, and the restraining portion 102 obstructs the rotation of the hook member 7.

  Further, as the hook member 7 rotates in the Y direction, the lever member 10 rotates in the biased Z direction. At the same time, the operation accompanying the rotation of the lever member 10 is transmitted to the operation knob 22 via the operation rod 30. Thereby, the operation knob 22 is pushed upward, and the operation knob upper surface 22a becomes flat with the frame portion upper surface 21a. That is, when the seat back 3 is in the locked state at the first standing position, the inner surface 21b of the frame part of the operation means 20 is not visible from outside (the upper surface 22a of the operation knob 22 is raised in the frame part 21). . As a result, the occupant can recognize that the vehicle is locked.

  Next, the operation state when displacing from the first standing position to the second standing position will be described with reference to FIG. In order to enter this operating state, the operating means 20 is operated to bring the hook member 7 and the auxiliary hook member 8 into the unlocked state. The operation of the operation means 20 will be described below.

  FIG. 5 shows an operating state when the seat back 3 is in the unlocked state at the second standing position. As shown in FIG. 5, the operation knob 22 provided in the frame portion 21 of the operation means 20 so as to be slidable in the vertical direction is pushed downward. The lever member 10 is pushed by being transmitted to the lever member 10. Then, the lever member 10 rotates in the anti-Z direction around the second pivot 53, and the contact between the restraining portion 102 of the lever member 10 and the shaft portion 76 of the hook member 7 is released. Subsequently, the pin portion 85 of the auxiliary hook member 8 is engaged with the side surface 102b on the approach direction side of the restraining portion 102 of the lever member 10 this time. If the operation knob 22 continues to be pushed down as it is, the auxiliary hook member 8 engages with the pin portion 85 and the side surface 102b of the restraining portion 102 of the lever member 10 to resist the urging force of the second spring 12. It will rotate in the anti-Y direction around the pivot 52. Accordingly, the long hole 84 of the auxiliary hook member 8 also rotates in the anti-Y direction, and the lower end surface 84b of the long hole 84 comes into contact with the shaft portion 76 of the hook member 7. When the operation knob 22 is further pushed downward, the auxiliary hook member 8 further rotates in the anti-Y direction from the state, so that the hook member 7 contacts the shaft portion 76 and the long hole 84 of the auxiliary hook member 8. As a result of the contact, the auxiliary hook member 8 rotates in the anti-Y direction (unlock direction) against the urging force of the first spring 11. That is, the lever member 10, the auxiliary hook member 8, and the hook member 7 are rotated in this order. At this time, the biasing force of the first spring 11 that biases the hook member 7 is set to be smaller than the biasing force of the fourth spring 14 that biases the lever member 10. The lever member 10 and the hook member 7 are rotated against the biasing force of the first spring 11 having a weak biasing force from the strong fourth spring 14, and a rotating member is added compared to the reverse case. Even if this is done, the operation load does not increase suddenly, and the operation knob 22 can be pushed in smoothly without any discomfort. Further, since the auxiliary hook member 8 is formed to be lighter than the hook member 7, the change in load required for the rotation from the lever member 10 to the hook member 7 becomes smoother, and the operability can be improved. .

  The first engagement groove 72 and the second engagement groove 73 of the hook member 7 are lifted upward by rotating in the anti-Y direction as the auxiliary hook member 8 rotates, and the first engagement groove 72 is The striker 4 is separated from the first engagement shaft 41 and is unlocked. At this time, the assist member 9 and the striker 4 are in a state indicated by a two-dot chain line in FIG.

  When the seat back 3 is moved from the first standing position to the second standing position in the unlocked state, the striker 4 is brought into contact with the assist member 9 from the state indicated by the two-dot chain line in FIG. The vehicle further enters the approach direction (front of the vehicle) while being in contact with the portion 92, and the assist member 9 and the striker 4 are in a state indicated by a solid line in FIG. At this time, the striker 4 moves to the entry direction end portion 51b of the entry groove 51 while being pushed in the counter entry direction by the assist member 9 biased in the X direction. The buffering sound due to the contact with the end portion 51b in the approach direction of the groove 51 is effectively reduced. In addition, you may provide buffer materials, such as rubber | gum, in the approach direction edge part 51b of the approach groove | channel 51 so that a buffer noise may be reduced more.

  Then, when the operation of the operation knob 22 is stopped in the state shown by the solid line in FIG. 5, the lever member 10 is moved in the Z direction and the auxiliary hook member 8 and the hook member 7 are Y Respectively, the second engagement shaft 42 of the striker 4 and the first engagement groove 72 of the hook member 7 are engaged, and the seat back 3 is in the locked state in the second standing position (see FIG. 6). ).

  Next, the operation state when the seat back 3 is locked at the second standing position will be described with reference to FIG.

As shown in FIG. 6, when the hook member 7 is rotated in the Y direction, the second engagement shaft 42 of the striker 4 and the first engagement groove 72 of the hook member 7 are engaged, and the seat back 3 is 2 Reliably and stably held in the standing position. The first engagement shaft 41 of the striker 4 is loosely fitted in the second engagement groove 73 and the auxiliary engagement groove 83. Accordingly, the second engagement shaft 42 of the striker 4 is not affected by variations in the dimensions of the first engagement shaft 41 and the second engagement shaft 42 of the striker 4 or errors in the mounting position of the lock assembly R. The hook member 7 is reliably engaged with the first engagement groove 72 in a predetermined state. The first engagement shaft 41 of the striker 4 is pressed in the anti-entry direction by the contact portion pressing surface 92a of the assist member 9 biased in the X direction. Further, the second engagement shaft 42 of the striker 4 is urged in the Y direction, and the extension portion of the auxiliary hook member 8 is formed so as to spread slightly toward the vehicle rear side as the vehicle rear side outer edge 8a goes upward. By 82, it is pushed in the anti-entry direction. Therefore, the second engagement shaft 42 is sandwiched between the extension portion pressing surface 82b of the auxiliary hook member 8 and the first engagement groove counter-ingress direction (vehicle rear) surface 72a of the hook member 7 to prevent rattling. The Thereby, the seat back 3 is reliably and stably held at the second standing position.

  At this time, the shaft portion 76 provided in the hook member 7 is in contact with the lower end 102a of the deterring portion 102 in the lever member 10, as in the case where the first standing position is locked. Therefore, even if the hook member 7 tries to rotate upward (anti-Y direction) due to vibration or impact, it is prevented and it can be prevented that the striker 4 is detached from the first engagement shaft 41 and the second engagement shaft 42.

  As in the locked state at the first standing position described above, the operation knob 22 is pushed upward as the hook member 7 and the lever member 10 rotate, and the operation knob upper surface 22a is the frame upper surface 21a. And flattened. That is, when the seat back 3 is in the locked state at the second standing position, similarly to when the seat back 3 is in the locked state at the first standing position, the frame portion inner surface 21b of the operating means 20 is invisible from the outside, You can recognize that it is locked.

  Next, an operation state when the seatback 3 is displaced from the second standing position to the lying position or the first standing position will be described. When displacing to this position, operation of the operation means 20 is required. This operation is the same operation as described above in FIG. That is, even when displacing from the second standing position to the lying position or the first standing position, the operation knob 22 is pushed down as shown in FIG.

  By the operation of the operation means 20, the hook member 7 is operated in the unlocked state as shown in FIG. Since the assist member 9 is urged to rotate in the X direction by the third spring 13, a force in the counter approaching direction acts on the striker 4 from the assist member 9. That is, the spring force is applied in the direction of displacement from the second standing position to the first standing position or the lying position. Therefore, as the hook member 7 operates in the unlocked state, the seat back 3 is lowered from the second standing position with a light force so that the reverse movement is performed with the assistance of the action of the spring force. The position or the first standing position can be displaced. Moreover, when it is displaced from the first standing position to the lying position, it can be easily displaced in the same manner, and detailed description is omitted.

(Other embodiments)
In the present embodiment, the lock mechanism is operated by pushing the operation knob 22, but the present invention is not limited to this configuration, and a configuration in which the lock mechanism is pulled up or slid may be used. Further, the operating rod 30 may be a link mechanism. Further, the auxiliary hook member 8 is arranged on the base plate 5 side from the hook member 7, but the configuration is not limited to this configuration, and the hook member may be arranged on the base plate side relative to the auxiliary hook member. In FIG. 3, the vehicle rear side lower end 7 a of the hook member 7 is held above the movement locus L of the striker 4, but in this configuration, the striker 4 extends in the approach direction at the vehicle rear side lower end of the hook member. It may be configured so that it does not come into contact at all when it moves, or a part of it can come into contact and the hook member 7 can be rotated upward.

  Further, the present embodiment is a case where the lock assembly R is provided on the left side of the vehicle of the seat back 3, but the present invention is not limited to this, and the lock assembly is provided on the right side of the seat back 3 of the vehicle. It can also be applied to cases where

  The present invention is suitable for a vehicle seat lock device.

DESCRIPTION OF SYMBOLS 1 Rear seat 2 Seat cushion 3 Seat back R Lock assembly 4 Strike 41 First engagement shaft 42 Second engagement shaft 5 Base plate 51 Entrance groove 52 First pivot 53 Second pivot 54 Third pivot 7 Hook member 7a Lower end on the rear side of the vehicle 71 hook base 72 first engagement groove 72a first engagement groove opposite entry surface 73 second engagement groove 74 projecting portion 75 projecting portion 76 shaft portion 8 auxiliary hook member 81 auxiliary hook base portion 82 extending portion 84 long hole 85 Pin portion 9 Assist member 91 Assist base portion 92 Contact portion 93 Restricting portion 10 Lever member 101 Lever base portion 102 Suppressing portion 102a Lower end 102b Side surface 103 Receiving portion 11 First spring (first spring member)
12 Second spring 13 Third spring 14 Fourth spring (second spring member)
20 Operating means 21 Frame portion 22 Operating knob L Strike movement locus

Claims (3)

A vehicle seat lock device capable of holding a seat back supported by a vehicle body so as to be able to rise and fall in a first standing position and a second standing position inclined to the first standing position,
A striker that is fixed to the vehicle body, and includes a first engagement shaft and a second engagement shaft that is positioned on a tilt side of the first engagement shaft along the direction in which the seat back is tilted;
A lock assembly that is attached to the seat back side and that the striker enters and engages;
The lock assembly includes a base plate fixed to the seat back,
A base member, and a hook member supported rotatably on the base plate with a horizontal axis.
The hook member engages with the first engagement shaft of the striker when the seat back is held in the first standing position, while the second engagement shaft is held when the seat back is held in the second standing position. A first engagement groove that engages with the first engagement groove, and the first engagement shaft is loosely fitted when the seatback is held in the second upright position and is positioned closer to the striker entry direction than the first engagement groove. And a second engaging groove that is juxtaposed along the approach direction of the striker,
The lock assembly includes an assist member whose base is rotatably supported by the base plate with a horizontal axis.
A base portion is rotatably supported by the base plate with a horizontal axis, and is rotated by an external operation to connect the hook member to the first engagement groove and the first or second engagement shaft of the striker. And a lever member that rotates in the unlocking direction in which the engagement is released,
The assist member is in contact with the first engagement shaft of the striker, and in contact with the hook member in a state where the striker has not entered the lock assembly. A restricting portion for restricting the hook member from rotating in a locking direction in which the groove engages with the first or second engaging shaft of the striker is formed;
The assist member is urged so that the abutting portion is directed in the counter-entry direction of the striker,
The lever member is prevented from rotating in the unlocking direction when the striker first or second engagement shaft is engaged with the first engagement groove of the hook member. A deterrence part is formed ,
A first spring member that urges the hook member to rotate in the locking direction;
A second spring member that urges the lever member to rotate so that the restraining portion is directed in the anti-entry direction of the striker;
The vehicle seat lock device according to claim 1, wherein the rotational biasing force of the first spring member is weaker than the rotational biasing force of the second spring member . The vehicle seat lock device according to claim 1,
The hook member includes a shaft portion provided so as to protrude toward the base plate,
The restraining portion of the lever member abuts on the shaft portion of the hook member when the first or second engagement shaft of the striker is engaged with the first engagement groove of the hook member. A vehicle seat lock device configured to inhibit rotation of the hook member in the unlocking direction . In the vehicle seat lock device according to claim 2 ,
The lock assembly includes an auxiliary hook member having a base supported coaxially and rotatably with the hook member between the hook member and the base plate,
The auxiliary hook member includes a pin portion provided so as to protrude toward the base plate side, and a long hole in which the shaft portion of the hook member is movably accommodated.
When releasing the state in which the first or second engagement shaft of the striker is engaged with the first engagement groove of the hook member, the lever member is moved so that the restraining portion is directed toward the striker entering direction. By rotating and engaging the restraining part with the pin part of the auxiliary hook member, the auxiliary hook member is rotated away from the striker and the auxiliary hook member is rotated to rotate the auxiliary hook member. the ends of the slots of the hook member is brought into contact with the shaft portion of the hook member, the vehicle seat lock, characterized in that it is configured to so that by rotating the hook member to the unlocked direction apparatus.

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