WO2017154307A1

WO2017154307A1 - Seat lock device

Info

Publication number: WO2017154307A1
Application number: PCT/JP2016/087784
Authority: WO
Inventors: 大祐刀根; 信義寺岡; 和也岩佐
Original assignee: アイシン精機株式会社
Priority date: 2016-03-09
Filing date: 2016-12-19
Publication date: 2017-09-14
Also published as: JP2017159778A

Abstract

A seat lock device has a hook, a pawl, a cam, and a pop-up piece. The hook forms a locked state in which a striker is gripped between the hook and a groove in at least a lock case. The cam engages with a first protrusion of the hook to hold the hook in the locked state. The pop-up piece is provided so as to be movable in the direction of entry of the striker and so as to be capable of coming in contact with the striker, and the pop-up piece is always pressed in the direction opposite the direction of entry of the striker. The pawl engages with the cam receiving surface of the pop-up piece to receive the pressing force of the pop-up piece, which acts in the direction opposite the direction of entry of the striker.

Description

Seat lock device

The present invention relates to a seat lock device for locking a vehicle seat to a vehicle body.

For example, the seat lock device of Patent Document 1 includes a housing having an opening for receiving a striker, a latch arm engaged with the striker, and an urging member. The latch arm moves between the latch release position and the latch position within the housing. The biasing member is a spring member made of a metal wire and has two coil portions. The first coil portion engages a portion of the latch arm to hold the latch arm in the unlatched position. The second coil portion is attached to a pin provided inside the housing. The urging member has a first end engaged with the housing and a second end engaged with the latch arm. The latch arm is always biased by the biasing member from the latch release position to the latch position.

When the striker enters the opening of the housing with the latch arm held at the latch release position, the striker comes into contact with the first coil portion of the biasing member. Thereafter, the first coil portion moves together with the striker in the striker entry direction against the urging force of the urging member. As a result, the engagement between the first coil portion and a portion of the latch arm is released. The latch arm moves from the latch release position toward the latch position by the urging force of the urging member.

In the state where the latch arm is held at the latch position, the biasing force of the biasing member causes the striker to be detached from the opening of the housing via the first coil portion of the striker restrained by the latch arm. Always granted in the direction. For this reason, when the latch arm is moved from the latch position to the latch release position and the engagement between the latch arm and the striker is released, the striker is moved in a direction away from the opening of the housing by the biasing force of the biasing member. Movement is assisted and pop-up function is demonstrated.

According to the seat lock device of Patent Document 1, in a state where the striker is restrained by the latch arm, the urging force of the urging member is constantly applied to the striker in a direction in which the striker is detached from the opening of the housing. Yes. For this reason, there is a possibility that the load required to release the locked state, that is, the unlocking load may increase.

US Patent Application Publication No. 2012/0133188

An object of the present invention is to provide a seat lock device that can reduce a load required to release a locked state.

In order to solve the above-described problem, according to a first aspect of the present invention, there is provided a groove portion that is provided on one of the seat and the vehicle body that are locked to each other and that receives a striker provided on the other of the seat and the vehicle body. A base, a case that is provided opposite the base and has a groove portion that receives the striker, and a hook that is rotatably supported between the base and the case and forms a locked state in which the striker is sandwiched between the groove portion of the case And a cam that is rotatably supported between the base and the case and engages a part of the hook to hold the hook in a locked state, and is movable between the base and the case in the striker entry direction and the striker A pressing member that is provided so as to be able to abut against and is constantly urged in a direction opposite to the direction in which the striker enters, a base and a case And a pole for receiving the urging force of the pressing member acting is rotatably supported in a direction opposite to the entering direction of the striker by engaging a portion of the pressing member between the seat lock device is provided.

The perspective view of the sheet | seat which shows the mounting position of the seat lock apparatus which concerns on one Embodiment of this invention. The exploded perspective view which looked at the seat lock device from the front. The disassembled perspective view which looked at the seat lock device from the back. The front view which shows the seat locking device of a locked state. The front view of the seat locking device which shows the state in the middle of unlocking operation. The front view of the seat locking device which shows the state in the middle of unlocking operation. The front view of the seat locking device which shows the state in the middle of unlocking operation. FIG. 3 is a front view of the unlocked seat lock device. The front view of the seat locking device which shows the state in the middle of locking operation. The front view of the seat locking device which shows the state in the middle of locking operation. The front view of the seat locking device which shows the state in the middle of locking operation. The front view of the seat locking device which shows the state in the middle of locking operation. The perspective view which shows the pole and hook in a locked state. The exploded perspective view explaining the assembly method of a seat lock device and a seat frame. The front view of the seat locking device attached to the seat frame. FIG. 16 is an end view taken along line 16-16 in FIG. 15; FIG. 17 is an end view taken along line 17-17 in FIG. 15; FIG. 18 is an end view taken along line 18-18 in FIG. 15;

Hereinafter, an embodiment in which the seat lock device is embodied in a seat provided at the rear portion of the vehicle will be described.
As shown in FIG. 1, the rear seat 10 includes a seat cushion 11 on which an occupant sits, and a seat back 12 on which the occupant rests his back. The seat back 12 is rotatable with respect to the seat cushion 11 around its lower end. The seat back 12 moves between a standing position indicated by a solid line in FIG. 1 and a forward tilt position indicated by a two-dot chain line in FIG.

A seat lock device 13 is provided on the upper side surface of the seat back 12. When the seat back 12 is in the standing position, the seat lock device 13 is engaged with a U-shaped striker 14 provided on the vehicle body, whereby the posture of the seat back 12 is maintained. When the release rod 15 connected to the seat lock device 13 is pulled, the engagement between the seat lock device 13 and the striker 14 is released, and the seat back 12 can be rotated from the standing position to the forward tilt position.

As shown in FIG. 2, the seat lock device 13 includes a base bracket 20, a sub base bracket 30, and a lock case 40.
The base bracket 20 is formed by plastically deforming a metal plate material punched into a predetermined shape. The base bracket 20 includes a rectangular support plate 21, a bent wall 22 provided on the upper edge of the support plate 21, and 2 provided on the lower corner of the support plate 21 located on the opposite side of the bent wall 22. There are two mounting

portions

23, 23.

The support plate 21 is provided with a groove 21a into which the striker 14 is inserted. The groove 21 a is a notch extending from the center of the lower edge of the support plate 21 located on the opposite side of the bent wall 22 to the vicinity of the center of the support plate 21. The support plate 21 is provided with two

insertion holes

21b and 21c. The

insertion holes

21b and 21c are provided at diagonal positions of the groove 21a. That is, the insertion hole 21b is provided in the vicinity of the corner of the bottom of the groove 21a, and the insertion hole 21c is provided in the vicinity of the opening of the groove 21a.

The bent wall 22 extends along the upper edge of the support plate 21. The bent wall 22 is orthogonal to the support plate 21. Each attachment portion 23 has a leg portion 23a bent in the same direction as the bent wall 22, and a fixing portion 23b provided at the tip of the leg portion 23a. The two

fixing portions

23b and 23b are portions where the ends of the

leg portions

23a and 23a are bent to the opposite sides.

Bolt holes

23c and 23c are provided in the

fixing portions

23b and 23b, respectively. Bolts (not shown) for fixing the base bracket 20 to a seat bracket (not shown) are inserted into the

bolt holes

23c and 23c.

The sub-base bracket 30 is also formed by plastically deforming a metal plate material punched into a predetermined shape. The sub-base bracket 30 is provided at a rectangular support plate 31, a bent wall 32 provided at the upper edge of the support plate 31, and a lower corner portion of the support plate 31 located on the opposite side of the bent wall 32. Two fixing portions 33 are provided.

The support plate 31 is provided with a groove 31a into which the striker 14 is inserted. The groove 31 a is a notch extending from the center of the lower edge of the support plate 31 located on the opposite side of the bent wall 32 to the vicinity of the center of the support plate 31. The support plate 31 is provided with two

insertion holes

31b and 31c. The insertion holes 31b and 31c are provided at diagonal positions of the groove 31a. That is, the insertion hole 31b is provided near the corner of the bottom of the groove 31a, and the insertion hole 31c is provided near the opening of the groove 31a. The insertion holes 31 b and 31 c are located on the same axis as the insertion holes 21 b and 21 c of the base bracket 20. The groove 31a coincides with the groove 21a of the base bracket 20 when viewed from the axial direction of the insertion holes 31b and 31c.

The bent wall 32 extends along the upper edge of the support plate 31. The bent wall 32 is orthogonal to the support plate 31. The two fixing

portions

33 and 33 are located on the same plane as the support plate 31. Each fixing

portion

33, 33 protrudes outward from both side edges of the support plate 31.

Bolt holes

33a and 33a are provided in the fixing

portions

33 and 33, respectively. The bolt holes 33 a and 33 a are located on the same axis as the bolt holes 23 c and 23 c of the base bracket 20.

The lock case 40 is provided between the support plate 21 of the base bracket 20 and the support plate 31 of the sub base bracket 30. The lock case 40 is made of a synthetic resin material and is formed in a box shape opened to the base bracket 20 side. A groove portion 41 into which the striker 14 is inserted is provided in the case bottom wall of the lock case 40. The groove 41 is a notch provided in the lower part of the lock case 40.

The bottom wall of the lock case 40 is provided with two

insertion holes

42b and 42c. The insertion holes 42 b and 42 c are provided at diagonal positions of the groove 41. That is, the insertion hole 42 b is provided in the vicinity of the corner of the bottom portion of the groove portion 41, and the insertion hole 42 c is provided in the vicinity of the opening portion of the groove portion 41. The insertion holes 42 b and 42 c are located on the same axis as the two

insertion holes

21 b and 21 c of the base bracket 20 and the two

insertion holes

31 b and 31 c of the sub base bracket 30. When viewed from the axial direction of the insertion holes 42 b and 42 c, the groove 41 coincides with the groove 21 a of the base bracket 20 and the groove 31 a of the sub base bracket 30.

A stepped portion 43 is provided on the right side surface of the lock case 40. The step portion 43 has a width in a direction (left-right direction) orthogonal to the groove portion 41. The width of the stepped portion 43 is slightly larger than the width of the pop-up piece 56. Three

guide grooves

43a, 43b, and 43c are provided on the inner bottom surface of the stepped portion 43. The

guide grooves

43 a, 43 b, 43 c extend in the vertical direction in parallel with the groove portion 41. The

guide grooves

43 a, 43 b, 43 c extend from the upper edge of the lock case 40 located on the side opposite to the opening of the groove portion 41 to the vicinity of the center in the longitudinal direction of the groove portion 41. When viewed from the axial direction of the insertion holes 42b and 42c, the groove 41 is located between the two guide grooves 43a and 43b. The remaining one guide groove 43c is provided so that the guide groove 43b is disposed between the guide groove 43c and the guide groove 43a.

The guide groove 43 a is an L-shaped groove having a portion extending in a direction away from the groove portion 41 (left direction) and a portion extending to the sub-base bracket 30. The guide groove 43 b is a groove having a rectangular cross section that extends straight in parallel with the groove portion 41. The guide groove 43c is an L-shaped groove having a portion extending to the sub-base bracket 30 and a portion extending in a direction away from the groove portion 41 (right direction).

As shown in FIG. 3, ribs 44 are provided on the periphery of the groove 41 on the surface of the lock case 40 facing the sub-base bracket 30. The rib 44 is an inverted U-shaped wall extending along the outline of the groove 41. The rib 44 is orthogonal to the bottom wall of the lock case 40. A flange 45 is provided at the tip of the rib 44. The flange 45 protrudes outward from the outer peripheral edge of the rib 44. The flange 45 is an inverted U-shaped wall provided in parallel to the bottom wall of the lock case 40.

As shown in FIG. 2, another component member of the seat lock device 13 is provided between the lock case 40 and the base bracket 20. As other components, there are a pole pin 51, a hook pin 52, a hook 53, a pole 54, a cam 55, a pop-up piece 56, a pole spring 57, a cam spring 58, and a pop-up spring 59.

The first end of the pole pin 51 is passed through the insertion hole 21 c of the base bracket 20. The second end of the pole pin 51 passes through the insertion hole 42 c of the lock case 40 and is passed through the insertion hole 31 c of the sub base bracket 30. The first end of the hook pin 52 is passed through the insertion hole 21 b of the base bracket 20. The second end portion of the hook pin 52 passes through the insertion hole 42 b of the lock case 40 and passes through the insertion hole 31 b of the sub base bracket 30. The pole pin 51 and the hook pin 52 are caulked at both ends thereof, thereby coupling the base bracket 20 and the sub base bracket 30 to each other. By the caulking operation, caulking heads 51a and 51b are formed at both ends of the pole pin 51, respectively. Caulking heads 52a and 52b are also formed at both ends of the hook pin 52, respectively. The lock case 40 is held between the base bracket 20 and the sub base bracket 30. The support plate 31 of the sub base bracket 30 and the bottom surface (left side surface) of the lock case 40 are held in contact with each other.

The hook 53 is provided so as to be rotatable with respect to the hook pin 52. The hook 53 is made of a metal material and is formed in a C-shaped plate shape as a whole. The hook 53 has a bearing hole 61 through which the hook pin 52 is passed and a restraining groove 62 that receives the striker 14. The restraining groove 62 is a groove between the first protruding portion 63 and the second protruding portion 64 that extends in a direction (rightward) orthogonal to the axis of the bearing hole 61. In FIG. 2, the first protrusion 63 is located above the second protrusion 64. The length of the first protrusion 63 is smaller than the length of the second protrusion 64. The first protruding portion 63 is inclined so as to be separated from the second protruding portion 64 toward the tip thereof.

A columnar pin 65 protrudes from the side surface of the first protrusion 63 facing the lock case 40. A side surface of the first protrusion 63 facing the second protrusion 64 constitutes a part of the restraining groove 62 and has a cam contact portion 66. When the seat lock device 13 is unlocked or locked, the cam 55 rotates with the cam contact portion 66 sliding the tip of the cam 55.

The hook 53 is covered with a buffer member 67 made of synthetic resin so that a part of the hook 53 is exposed. As a result, the entire first protrusion 63 and the tip of the second protrusion 64 are exposed.

The pole 54 is provided so as to be rotatable with respect to the pole pin 51. The pole 54 is made of a metal material and is formed in an elongated plate shape. The pole 54 includes a first end portion 71 (lower end portion), a second end portion 72 (upper end portion), and a connecting portion 73 that connects the first and

second end portions

71 and 72. Yes. The first end portion 71 and the second end portion 72 are not located on the same plane. The connecting portion 73 is plastically deformed so that the positions of the first end portion 71 and the second end portion 72 are different in the axial direction of the pole pin 51. Specifically, the second end portion 72 is located between the first end portion 71 and the bottom wall of the lock case 40. The first end 71 is disposed so as to coincide with the hook 53 in the axial direction of the pole pin 51. The second end portion 72 is disposed so as to coincide with the pop-up piece 56 in the axial direction of the pole pin 51.

The first end portion 71 has a cylindrical portion 71a and a protruding portion 71b partially provided on the peripheral surface of the cylindrical portion 71a. The cylindrical portion 71 a is provided with a bearing hole 74 through which the pole pin 51 is passed. A first cam surface 76 is provided on the distal end surface of the protruding portion 71b. The first cam surface 76 is an arc surface concentric with the bearing hole 74 and is also a boundary surface with the connecting portion 73. When the seat lock device 13 is unlocked or locked, the first cam surface 76 slides on the surface opposite to the restraining groove 62 at the tip of the second protrusion 64 of the hook 53.

The second end 72 is provided with a hooking hole 75 in which a part of the release rod 15 is hooked. A second cam surface 77 is provided on the peripheral surface of the second end portion 72. The second cam surface 77 is an arc surface concentric with the retaining hole 75. Further, a contact surface 78 is provided on the peripheral surface of the second end portion 72. The contact surface 78 is a plane that forms an acute angle with the second cam surface 77. The acute angle formed between the contact surface 78 and the second cam surface 77 is slightly smaller than the right angle. When the seat lock device 13 is unlocked or locked, the contact surface 78 contacts a part of the pop-up piece 56 in the rotation direction of the pole 54.

The release rod 15 includes a short shaft portion 15a and a long shaft portion 15b, and is formed in an L shape. The short shaft portion 15 a is inserted into the retaining hole 75 of the pole 54. The long shaft portion 15 b is led out to the outside through a gap between the base bracket 20 and the lock case 40. The outer end portion of the long shaft portion 15b is connected to a knob (not shown) provided on the seat back 12.

The cam 55 is also provided so as to be rotatable with respect to the pole pin 51. The cam 55 is made of a metal material and is formed in an elongated plate shape. The cam 55 is located between the hook 53 and the base bracket 20 in the axial direction of the pole pin 51. The first end (lower end) of the cam 55 has a bearing hole 81 through which the pole pin 51 is passed. A hook receiving portion 82 is provided at the second end (upper end) of the cam 55. The hook receiving portion 82 is a portion where the second end portion of the cam 55 is bent toward the side opposite to the base bracket 20, that is, toward the hook 53. The hook receiving portion 82 is formed in a plate shape that gently curves in the rotational direction of the cam 55. The cam 55 has an engaging protrusion 83. The engagement protrusion 83 is provided on the side edge (right edge) farther from the hook pin 52 out of the two side edges positioned in the rotation direction of the cam 55. The engaging protrusion 83 is formed in an L shape that bends toward the pole 54.

The pop-up piece 56 is made of a synthetic resin material. The pop-up piece 56 has a first piece 91 that engages with the striker 14 and a second piece 92 that engages with the pole 54. Both the first piece 91 and the second piece 92 have a rectangular parallelepiped shape. The first piece 91 and the second piece 92 are arranged in the left-right direction orthogonal to the axis of the groove 41 of the lock case 40. When viewed from the axial direction of the pole pin 51, the first piece 91 is located at the center in the width direction (left-right direction) of the groove portion 41 of the lock case 40. The second piece 92 is located between the first piece 91 and the pole 54, that is, on the right side of the first piece 91. The first piece 91 is longer than the second piece 92 in the axial direction (vertical direction) of the groove 41 of the lock case 40. The first piece 91 and the second piece 92 each have an upper surface that faces the bent wall 32 of the sub-base bracket 30. The upper surfaces of the first and

second pieces

91 and 92 constitute a single flat surface.

An engagement hole 93 is provided in the first piece 91. The engagement hole 93 passes through the first piece 91 in the axial direction of the pole pin 51. When viewed from the axial direction of the pole pin 51 or the hook pin 52, the engagement hole 93 has a rectangular shape extending in the arrangement direction (left-right direction) of the first piece 91 and the second piece 92. The pin 65 of the hook 53 is inserted into the engagement hole 93 from the side opposite to the lock case 40. The pin 65 can be engaged with the inner surface of the engagement hole 93.

A spring accommodation hole 94 is provided on the upper surface of the second piece 92. A cam receiving surface 95 is provided on the lower surface of the second piece 92. The cam receiving surface 95 extends gently in the direction in which the first piece 91 and the second piece 92 are arranged (left-right direction), and is gently curved so as to protrude toward the bent wall 32 of the sub-base bracket 30. The second cam surface 77 of the pole 54 is guided while being slid with respect to the cam receiving surface 95.

In the pop-up piece 56, three

guide protrusions

96a, 96b, 96c are provided on the side surface on the lock case 40 side. The

guide protrusions

96a, 96b, 96c extend along the

guide grooves

43a, 43b, 43c of the lock case 40, respectively. The guide protrusion 96 a is provided on the left side surface of the first piece 91 located on the opposite side of the second piece 92. The guide protrusion 96 a is an L-shaped plate having a portion extending to the opposite side of the second piece 92 and a portion extending to the lock case 40. The remaining two

guide protrusions

96b and 96c are provided on the side surface of the second piece 92 facing the lock case 40. The guide protrusion 96 b has a rectangular cross section extending along the spring accommodating hole 94. The guide protrusion 96c is an L-shaped plate having a portion extending to the lock case 40 and a portion extending to the opposite side of the first piece 91.

The three

guide protrusions

96a, 96b, and 96c are inserted into the three

guide grooves

43a, 43b, and 43c of the lock case 40 from the side (upper side) opposite to the groove portion 41 of the lock case 40, respectively. When the three

guide protrusions

96a, 96b, and 96c are guided by the three

guide grooves

43a, 43b, and 43c, the pop-up piece 56 moves along the

guide grooves

43a, 43b, and 43c.

The movement of the pop-up piece 56 in the axial direction of the pole pin 51 is restricted by the

guide protrusions

96a and 96c engaging with the guide grooves 43a and 43c, respectively. Further, the movement of the pop-up piece 56 in the direction orthogonal to the axial direction of the pole pin 51 is restricted by the

guide protrusions

96a, 96b, 96c engaging with the

guide grooves

43a, 43b, 43c, respectively. For this reason, the movement of the pop-up piece 56 along the

guide grooves

43a, 43b, 43c is stabilized.

As shown in FIG. 2, the pole spring 57 is a torsion coil spring. The pole spring 57 is attached to the pole pin 51 inserted through the insertion hole 42 c of the lock case 40 from between the lock case 40 and the sub base bracket 30. The first end 57 a of the pole spring 57 is hooked on a hooking portion (not shown) of the lock case 40. When viewed from the axial direction of the pole pin 51, the second end 57 b of the pole spring 57 is hooked on the side surface of the pole 54 (projecting portion 71 b) located on the opposite side to the groove 41. Therefore, the pole 54 is always urged in the direction of rotating toward the groove 41 of the lock case 40 by the elastic force of the pole spring 57.

The cam spring 58 is a torsion coil spring. The cam spring 58 is attached to the pole pin 51 from between the cam 55 and the base bracket 20. The first end 58 a of the cam spring 58 is hooked on a hooking portion (not shown) of the base bracket 20. The second end portion 58 b of the cam spring 58 is hooked on the side edge portion of the cam 55 provided with the engagement protrusion 83. Accordingly, the cam 55 is always urged in the direction of rotating toward the groove 41 of the lock case 40 by the elastic force of the cam spring 58.

The pop-up spring 59 is a compression coil spring. The first end (lower end) of the pop-up spring 59 is inserted into the spring accommodation hole 94 of the pop-up piece 56. The second end (upper end) of the pop-up spring 59 abuts on the bent wall 32 of the sub base bracket 30. The pop-up piece 56 is always urged in the direction opposite to the bent wall 32, that is, the direction opposite to the approach direction of the striker 14 (downward) by the elastic force of the pop-up spring 59.

In the locked state where the seat lock device 13 restrains the striker 14, each component of the seat lock device 13 is held in the following state.
As shown in FIG. 4, the pole 54 is held at a piece lock position that restricts the pop-up piece 56 from moving downward. That is, the pop-up piece 56 is always urged downward by the elastic force of the pop-up spring 59. However, the movement of the pop-up piece 56 is restricted by the cam receiving surface 95 of the pop-up piece 56 coming into contact with the second cam surface 77 (upper end surface) of the pole 54. The cam receiving surface 95 of the pop-up piece 56 is pressed against the second cam surface 77 of the pole 54 by the elastic force of the pop-up spring 59.

At this time, the lower surface of the first piece 91 located on the side opposite to the bent wall 32 of the sub-base bracket 30 is substantially the same position as the bottom surface (inner top surface) of the groove portion 41 of the lock case 40 or the bottom surface of the groove portion 41. It is held at a position slightly beyond upward.

Further, the pole 54 is always urged counterclockwise in FIG. 4 by the elastic force of the pole spring 57. The rotation of the pole 54 in the counterclockwise direction is such that the corner portion formed by the second cam surface 77 and the abutment surface 78 of the pole 54 has a side portion (first portion of the first piece 91 in the pop-up piece 56 (first It is regulated by coming into contact with the step 91 of the piece 91 and the second piece 92. The corner portion of the pole 54 is pressed against the side portion of the first piece 91 by the elastic force of the pole spring 57.

The cam 55 is held at a hook lock position that restricts the hook 53 from rotating in the unlocking direction (clockwise). That is, the upper end of the hook receiving portion 82 of the cam 55 is in contact with the cam contact portion 66 of the first protrusion 63 of the hook 53. When the first protrusion 63 of the hook 53 is received by the hook receiving portion 82 of the cam 55, the hook 53 is restricted from rotating in the unlocking direction. The cam 55 is always urged counterclockwise in FIG. 4 by the elastic force of the cam spring 58. However, the counterclockwise rotation of the cam 55 causes the engagement protrusion 83 to engage the pawl 54, more precisely, the connecting portion 73 that connects the first end 71 and the second end 72. It is regulated by doing.

Thus, when the pole 54 is held in the piece lock position and the cam 55 is held in the hook lock position, the posture of the hook 53 is as follows. That is, when viewed from the axial direction of the hook pin 52, the second protrusion 64 of the hook 53 extends so as to cross the groove 41 of the lock case 40 in a direction intersecting the center line L1. When viewed from the axial direction of the hook pin 52, the tip (right end) of the second protrusion 64 overlaps the cam 55. The tip of the second protrusion 64 is located between the cam 55 and the sub base bracket 30 (back side of the paper surface) (see FIG. 13). The striker 14 is sandwiched between the second protrusion 64 and the bottom surface of the groove 41.

Further, when viewed from the axial direction of the hook pin 52, the first projecting portion 63 is received by the hook receiving portion 82 of the cam 55. As a result, the first protrusion 63 is held at a position disengaged upward from the groove 41 of the lock case 40, that is, at a position not overlapping the groove 41. The pin 65 of the first protrusion 63 is kept in a state where it does not contact the inner surface of the engagement hole 93 of the pop-up piece 56.

Next, an operation when the seat lock device 13 is switched from the locked state to the unlocked state will be described.
As shown in FIG. 5, the release rod 15 is pulled when the seat lock device 13 is switched from the locked state to the unlocked state. As the release rod 15 is pulled, the pole 54 rotates clockwise in FIG. 5 against the elastic force of the pole spring 57. As the pole 54 rotates, the second cam surface 77 of the pole 54 moves to the right so as to move away from the first piece 91 while sliding on the cam receiving surface 95 of the pop-up piece 56.

In the locked state, the engaging protrusion 83 of the cam 55 is engaged with the pole 54. Therefore, in conjunction with the clockwise rotation of the pole 54, the cam 55 also rotates in the clockwise direction in FIG. 5 against the elastic force of the cam spring 58. As the cam 55 rotates, the hook receiving portion 82 of the cam 55 moves to the right and slides from the proximal end to the distal end of the cam contact portion 66 of the hook 53. At this time, due to the unevenness of the cam contact portion 66 or the height difference depending on the degree of the unevenness, the hook 53 slightly rotates clockwise as the hook receiving portion 82 moves as described above. Further, since the position of the pop-up piece 56 is maintained by the pole 54, the pin 65 of the hook 53 moves downward in the engagement hole 93 of the pop-up piece 56, so that the pop-up piece 56 is positioned on the inner surface of the engagement hole 93 close to the groove portion 41. Abut.

As shown in FIG. 6, when the release rod 15 is further pulled, the pole 54 further rotates in the clockwise direction. Eventually, when the pole 54 reaches the piece lock release position, the engagement between the second cam surface 77 of the pole 54 and the cam receiving surface 95 of the pop-up piece 56 is released. Thereby, the downward movement of the pop-up piece 56 is permitted. At this time, the first cam surface 76 of the pole 54 deviates from the rotation locus of the second protrusion 64 of the hook 53. Further, the cam 55 is further rotated in the clockwise direction in conjunction with the pole 54, and the cam 55 reaches the hook unlocking position, so that the hook receiving portion 82 of the cam 55 and the cam contact portion 66 of the hook 53 are engaged. Is released. Thereby, the hook 53 is allowed to rotate in the unlocking direction (clockwise).

Then, as shown in FIG. 7, the pop-up piece 56 moves downward by the elastic force of the pop-up spring 59. As a result, the pin 65 of the hook 53 moves upward in the engagement hole 93 of the pop-up piece 56 and comes into contact with the inner surface of the engagement hole 93 located on the opposite side to the groove portion 41. Until the pin 65 of the hook 53 is engaged with the engagement hole 93 of the pop-up piece 56, the hook 53 is slightly rotated in the clockwise direction in FIG.

After the pin 65 is engaged with the inner surface of the engagement hole 93, the pin 65 is pressed downward via the pop-up piece 56. Thereby, the hook 53 rotates around the hook pin 52 in the clockwise direction according to the movement amount of the pop-up piece 56. Further, as the pop-up piece 56 moves, the pop-up piece 56 pushes the striker 14 out of the groove 41 of the lock case 40. That is, the striker 14 is pushed out from the groove 41 of the lock case 40 by the pop-up piece 56. Here, the elastic force of the pop-up spring 59 is applied to the striker 14 through the pop-up piece 56 in the direction in which the striker 14 is pushed out from the groove 41. The elastic force of the pop-up spring 59 assists the pushing out of the striker 14 from the groove portion 41 and exhibits a pop-up function.

At this time, the contact surface 78 of the pole 54 is brought into contact with the right side surface of the pop-up piece 56 located on the opposite side of the first piece 91, that is, the second piece 92 by the elastic force of the pole spring 57. It is pressed against the surface 91a. Thereby, the counterclockwise rotation of the pole 54 is restricted. That is, the pole 54 is held at the pole lock release position. As the pop-up piece 56 moves, the contact surface 78 of the pole 54 slides on the contacted surface 91 a of the pop-up piece 56. Further, when the engaging projection 83 of the cam 55 contacts the pole 54, the rotation of the cam 55 in the counterclockwise direction is also restricted. As a result, the cam 55 is maintained at the cam lock release position.

8, as the pop-up piece 56 moves in the direction to push the striker 14 out of the groove 41, the hook 53 further rotates in the clockwise direction in FIG. Then, the outer edge portion 53 a of the hook 53 located on the side opposite to the restraining groove 62 comes into contact with the stopper wall 40 a constituting the side wall of the lock case 40. As a result, the clockwise rotation of the hook 53 is restricted, and the downward movement of the pop-up piece 56 is also restricted. In a state where the outer edge portion 53 a of the hook 53 is in contact with the stopper wall 40 a, the second protruding portion 64 of the hook 53 is disposed outside the groove portion 41 of the lock case 40. That is, the second protrusion 64 does not exist in the groove 41 when viewed from the axial direction of the hook pin 52. At this time, the restraining groove 62 of the hook 53 is maintained in an unlocked state in which the restraining groove 62 is opened in the groove 41 of the lock case 40. For this reason, the striker 14 can be detached from the restraining groove 62.

Further, when the outer edge portion 53a of the hook 53 is brought into contact with the stopper wall 40a, the unlocked state of the seat lock device 13 is maintained. That is, the pole 54 tends to rotate counterclockwise in FIG. 8 by the elastic force of the pole spring 57. However, the rotation of the pole 54 is restricted by bringing the contact surface 78 into contact with the contacted surface 91 a of the pop-up piece 56. For this reason, even after the pulling operation of the release rod 15 is released, the unlocked state of the seat lock device 13 is maintained.

Thereafter, the seat back 12 is rotated from the standing position to the forward tilt position, and the seat lock device 13 is moved away from the striker 14. Thereby, the striker 14 can be smoothly removed from the groove 41 of the lock case 40.

Next, an operation when the seat lock device 13 is switched from the unlocked state to the locked state will be described.
As shown in FIG. 8, when the seat lock device 13 is maintained in the unlocked state, the opening of the restraining groove 62 of the hook 53 overlaps the opening of the groove portion 41 of the lock case 40. Further, the second protrusion 64 of the hook 53 is positioned outside the groove 41 of the lock case 40. Further, when viewed from the axial direction of the hook pin 52, the first piece 91 of the pop-up piece 56 overlaps the groove 41 and is closer to the opening of the groove 41 than the first protrusion 63 of the hook 53. For this reason, when the seat back 12 is rotated from the forward tilt position to the standing position, the striker 14 comes into contact with the first piece 91 of the pop-up piece 56 after entering the groove 41 of the lock case 40. Here, since the pop-up piece 56 is made of synthetic resin, abnormal noise when the striker 14 abuts on the pop-up piece 56 is suppressed.

As shown in FIG. 9, the pop-up piece 56 is pressed in the entry direction (upward) of the striker 14 by the striker 14 trying to enter the bottom of the groove 41 of the lock case 40. Thereby, the pop-up piece 56 moves in the approach direction of the striker 14 so as to retreat from the groove 41 against the elastic force of the pop-up spring 59. As the pop-up piece 56 moves as described above, the lower inner surface of the engaging hole 93 of the pop-up piece 56 contacts the pin 65 of the hook 53.

As shown in FIG. 10, after the lower inner surface of the engagement hole 93 comes into contact with the pin 65 of the hook 53, the striker 14 enters the bottom of the groove 41 while pressing the pop-up piece 56. Along with this, the pin 65 of the hook 53 is pressed in the direction in which the striker 14 enters through the pop-up piece 56. Therefore, as the striker 14 enters the groove 41, the hook 53 rotates in the counterclockwise direction in FIG. As the hook 53 rotates, the second protrusion 64 gradually moves to a position where the opening of the groove 41 is blocked. At this time, the pawl 54 is at the pawl unlocking position where the abutment surface 78 abuts against the abutted surface 91 a of the pop-up piece 56, and the cam 55 is at the cam unlocking position where the engaging projection 83 is engaged with the pawl 54. Each is kept. As the pop-up piece 56 moves, the contact surface 78 of the pole 54 slides on the contacted surface 91 a of the pop-up piece 56.

As shown in FIG. 11, when the striker 14 further enters the groove 41 of the lock case 40, the pop-up piece 56 further moves in the entry direction of the striker 14. Then, when the contacted surface 91a of the pop-up piece 56 completely passes through the contact surface 78 of the pole 54, the engagement between the contacted surface 91a and the contact surface 78 is released. As a result, the pole 54 can rotate counterclockwise in FIG.

After contacting the first piece 91 of the pop-up piece 56, the pop-up piece 56 is pressed in the direction in which the striker 14 enters against the elastic force of the pop-up spring 59. When the striker 14 comes into contact with the bottom of the groove 41 of the lock case 40, the second protrusion 64 of the hook 53 engages with the striker 14 so as to block the opening of the groove 41 of the lock case 40.

Thus, the striker 14 entering the groove portion 41 is received by the pop-up piece 56. The hook 53 is rotated in the locking direction by a pop-up piece 56 that moves in the direction in which the striker 14 enters. As a result, the following actions and effects can be obtained. That is, unlike the configuration in which the striker 14 entering the groove 41 is guided to the inside of the restraining groove 62 while being received by the first protrusion 63 of the hook 53, it is necessary to receive the striker 14 by the first protrusion 63 of the hook 53. Absent. For this reason, the length of the 1st protrusion part 63 of the hook 53 can be made small. Since the hook 53 is a rotating body, if the length of the first protrusion 63 of the hook 53 can be reduced, it contributes to downsizing of the entire seat lock device 13.

As shown in FIG. 12, when the engagement between the contacted surface 91a of the pop-up piece 56 and the contact surface 78 of the pole 54 is released, first, the pole 54 is moved by the elastic force of the pole spring 57 as shown in FIG. Rotate counterclockwise. As the pole 54 rotates, the second cam surface 77 slides on the cam receiving surface 95 of the pop-up piece 56 toward the first piece 91. Further, the first cam surface 76 slides on a cam receiving surface 64 a provided on the outer surface of the tip of the second protrusion 64 of the hook 53. Eventually, the corner portion of the pole 54 comes into contact with the side portion of the first piece 91 in the pop-up piece 56, whereby the rotation of the pole 54 is restricted. Thereby, the pole 54 is maintained in the piece lock position.

The pop-up piece 56 is always urged in the direction opposite to the direction in which the striker 14 enters by the elastic force of the pop-up spring 59. However, the movement of the pop-up piece 56 is restricted by the cam receiving surface 95 of the pop-up piece 56 coming into contact with the second cam surface 77 of the pole 54. That is, the cam receiving surface 95 of the pop-up piece 56 is received by the second cam surface 77 of the pole 54 in a state where the pole 54 is held at the piece lock position. At this time, the lower surface of the pop-up piece 56 is held at substantially the same position as the bottom surface of the groove portion 41 of the lock case 40 or at a position slightly beyond the bottom surface of the groove portion 41.

Rotation of the pole 54 in the counterclockwise direction also enables the cam 55 to rotate in the counterclockwise direction. When the cam 55 rotates counterclockwise by the elastic force of the cam spring 58, the hook receiving portion 82 of the cam 55 slides on the cam contact portion 66 of the hook 53 toward the inside of the restraining groove 62. .

As shown in FIG. 4, when the cam 55 further rotates counterclockwise, the hook 53 further rotates counterclockwise according to the unevenness of the cam contact portion 66 or the height difference depending on the degree of the unevenness. That is, the hook 53 is pressed in the locking direction by the hook receiving portion 82 of the cam 55. At this time, the pop-up piece 56 is pressed against the second cam surface 77 of the pole 54 by the elastic force of the pop-up spring 59. For this reason, the pin 65 of the hook 53 moves counterclockwise in the engagement hole 93 of the pop-up piece 56 by the amount that the hook 53 rotates counterclockwise. As a result, the pin 65 is disposed away from the lower inner surface of the engagement hole 93.

When the engagement protrusion 83 of the cam 55 contacts the pole 54, the rotation of the cam 55 in the counterclockwise direction is restricted. As a result, the cam 55 is kept in the hook lock position. In a state where the cam 55 is held at the hook lock position, the pin 65 of the hook 53 is kept away from the inner surface of the engagement hole 93.

Further, when the hook 53 rotates counterclockwise to such an extent that the pin 65 is separated from the inner surface of the engagement hole 93, the second protrusion 64 of the hook 53 further presses the striker 14 upward. For this reason, the striker 14 is more strongly sandwiched between the bottom of the groove 41 of the lock case 40 and the second protrusion 64 of the hook 53. Thereby, rattling of the striker 14 is suppressed and the locked state in which the striker 14 is restrained is maintained.

Next, the effect of the pole will be described.
In the locked state, the pop-up piece 56 is received by the pole 54. For this reason, the elastic force of the pop-up spring 59 that acts in the direction in which the striker 14 is pushed out from the groove 41 is not applied to the striker 14. Accordingly, the force (release load) required for the unlocking operation of the seat lock device 13 becomes smaller. Further, since the pop-up piece 56 is received by the pole 54, no force in the unlocking direction acts on the hook 53. For this reason, the elastic force of the cam spring 58 can be further reduced.

Next, the function and effect of the hook / cam positional relationship will be described.
Further, in the locked state, a part of the cam 55 and the tip of the second projecting portion 64 of the hook 53 are kept in a state where they overlap each other in the axial direction of the hook pin 52. Thereby, the following operations and effects can be obtained. That is, when the seat back 12 is kept in the standing position, the seat lock device 13 is kept in the locked state. At this time, it is assumed that the hook 53 is inclined toward the cam 55 along the hook pin 52 due to the twist of the sheet 10 or the like. In this regard, when the seat lock device 13 is kept in a locked state, a part of the cam 55 and the tip of the second projecting portion 64 of the hook 53 (the portion exposed from the buffer member 67) are in the axial direction of the hook pin 52. overlapping. For this reason, the movement of the hook 53 to tilt toward the cam 55 is restricted by the tip of the second protrusion 64 coming into contact with the cam 55. For this reason, the engagement between the tip of the second protrusion 64 in the hook 53 and the first cam surface 76 in the pole 54 is difficult to disengage.

Next, the effect of the cam hook receiving portion will be described.
As shown in FIG. 13, the cam 55 is formed by partially plastically deforming a metal plate material punched into a predetermined shape. The cam 55 is preferably made of a metal plate having a surface roughness that is stable to a certain degree. In this case, the surface roughness of the metal plate and the stability of the surface roughness are not impaired before and after the plastic deformation. For this reason, the surface roughness of the hook receiving portion 82 is approximately the same as the surface roughness of the metal plate before plastic deformation. Further, the variation in the roughness of the entire surface of the hook receiving portion 82 is as small as that of the metal plate before plastic deformation and is stable. Therefore, when the seat lock device 13 is switched from the unlocked state to the locked state, wear due to the hook receiving portion 82 sliding on the cam contact portion 66 of the hook 53 is suppressed. For this reason, the durability of the hook receiving portion 82 of the cam 55 against repeated use of the seat lock device 13 is improved.

Also, the contact area between the cam contact portion 66 of the hook 53 and the hook receiving portion 82 can be adjusted by adjusting the amount of bending deformation of the metal plate material. For example, the width D2 of the hook receiving portion 82 can be set in accordance with the thickness D1 of the hook 53. If the contact area between the cam contact portion 66 and the hook receiving portion 82 increases, the load load per unit area of the hook receiving portion 82 decreases. This also improves the durability of the cam 55 against repeated use of the seat lock device 13.

Next, a method for attaching the seat lock device 13 to the seat back 12 will be described.
As shown in FIG. 14, the seat lock device 13 is attached to a seat frame (not shown) via a bracket 101. The bracket 101 has a substantially square cylindrical shape, and one side surface is open. The bracket 101 has an attachment wall 101a to which the seat lock device 13 is attached, and two

side walls

101b and 101c provided on both long side edges of the attachment wall 101a. The

side walls

101b and 101c are orthogonal to the mounting wall 101a.

An opening 102 is provided at a corner formed by the mounting wall 101a and one side wall 101b. The opening 102 includes a first opening portion 102a provided in the mounting wall 101a and a second opening portion 102b provided in the side wall 101b. The first opening portion 102a and the second opening portion 102b are continuous with each other. The first opening portion 102 a and the second opening portion 102 b extend in a direction perpendicular to the longitudinal axis of the bracket 101. The contour shape of the first opening portion 102 a is the same as the contour shape of the inverted U-shaped rib 44 in the seat lock device 13. The rib 44 protrudes from the sub base bracket 30 by the thickness of the mounting wall 101 a of the bracket 101. For this reason, the rib 44 fits into the first opening portion 102a.

The mounting wall 101a is provided with insertion holes 103a and 103b. When the rib 44 is aligned with the first opening portion 102a when viewed from the mounting direction of the seat lock device 13 with respect to the mounting wall 101a, the insertion hole 103a is the caulking head 52b of the hook pin 52, and the insertion hole 103b is the caulking head of the pole pin 51. 51b are arranged so as to coincide with each other. The inner diameters of the insertion holes 103a and 103b are slightly larger than the outer diameters of the caulking heads 51b and 52b.

The mounting wall 101a is provided with two

bolt holes

104, 104. When the rib 44 is aligned with the first opening portion 102a when viewed from the mounting direction of the seat lock device 13 with respect to the mounting wall 101a, the two

bolt holes

104, 104 are formed with the two

bolt holes

33a, 33a of the sub-base bracket 30. Are arranged so as to match each.

When the seat lock device 13 is attached to the bracket 101, the sub base bracket 30 is directed toward the attachment wall 101a, and then the seat lock device 13 is brought close to the attachment wall 101a. The flange portion 45 passes through the first opening portion 102a while being elastically deformed by engaging with the inner edge of the first opening portion 102a in the mounting wall 101a. At this timing, the rib 44 fits into the first opening portion 102a, and the entire surface of the sub base bracket 30 contacts the mounting wall 101a. At the timing when the rib 44 fits into the first opening portion 102a, the caulking head 51b of the pole pin 51 is inserted into the insertion hole 103b of the mounting wall 101a, and the caulking head 52b of the hook pin 52 is inserted into the insertion hole 103a. At this time, the

bolt holes

33a, 33a of the sub-base bracket 30 and the bolt holes 104, 104 of the mounting wall 101a coincide with each other.

Bolts

105 and 105 are inserted into the two sets of

bolt holes

33a and 104, respectively, and nuts (not shown) are fastened to the tips of both bolts 105 from the back side of the mounting wall 101a. Thus, the seat lock device 13 is fixed to the bracket 101.

FIG. 15 shows a state when the seat lock device 13 attached to the bracket 101 is viewed from the axial direction of the hook pin 52. In this state, the groove 41 of the lock case 40 coincides with the first opening 102 a of the bracket 101. Therefore, when the seat lock device 13 is switched from the locked state to the unlocked state by operating the release rod 15, when the seat back 12 is rotated from the standing position to the forward tilted position, the striker 14 has the first position of the bracket 101. Are smoothly removed from the opening portion 102a and the second opening portion 102b. On the other hand, when the seat back 12 is rotated from the forward tilt position to the standing position after the seat lock device 13 is switched to the unlocked state, the striker 14 has the first opening portion 102a and the second opening portion 102b of the bracket 101. Through the groove 41 of the lock case 40.

Next, the effect of the rib in the lock case will be described.
As shown in FIG. 16, in a state where the seat lock device 13 is attached to the bracket 101, the rib 44 of the lock case 40 is fitted in the first opening portion 102 a of the bracket 101. Further, the flange portion 45 of the rib 44 is engaged with the side surface of the bracket 101 located on the side opposite to the seat lock device 13, specifically, the edge portion of the first opening portion 102a.

For this reason, workability when the seat lock device 13 is fixed to the bracket 101 by the

bolts

105 and 105 is improved. For example, the seat lock device 13 is attached to the bracket 101 with the openings of the

groove portions

41, 31 a and 21 a of the seat lock device 13 facing upward or sideways. In this case, even before the bolt 105 is inserted into the bolt holes 33 a and 104, the rib 44 is caught on the inner edge of the first opening portion 102 a of the bracket 101. That is, the seat lock device 13 is temporarily fixed by being supported by the bracket 101 in the direction of gravity. Thus, the seat locking device 13 is positioned on the bracket 101, so that the fixing work with the bolts 105 is simplified.

Further, the positioning of the seat lock device 13 and the bracket 101 using the fitting relationship between the rib 44 and the first opening portion 102a has the following advantages. That is, by attaching the seat lock device 13 to the bracket 101 with the rib 44 as a reference, the groove portion 41 of the lock case 40 can be adjusted to a desired position with respect to the first opening portion 102 a of the bracket 101. That is, the positional accuracy of the groove 41 (grooves 21a, 31a) with respect to the approach path of the striker 14 is ensured. Therefore, when the seat back 12 is rotated from the forward tilt position to the standing position while the seat lock device 13 is held in the unlocked state, the striker 14 is easily received in the groove 41 of the lock case 40.

Here, the bolt holes 104, 104 of the bracket 101 may be long holes. This is because the position of the

bolt holes

33a, 33a of the seat lock device 13 and the bolt holes 104, 104 of the bracket 101 may be shifted by attaching the seat lock device 13 to the bracket 101 with the rib 44 as a reference. . By making the bolt holes 104 and 104 of the bracket 101 into long holes, it is possible to absorb a positional shift between the bolt holes 33a and 33a of the seat lock device 13 and the bolt holes 104 and 104 of the bracket 101.

Next, the effect of the caulking head of the hook pin / pole pin will be described.
Incidentally, when the bolt holes 104, 104 of the bracket 101 are round holes, the following may occur when the seat lock device 13 is attached to the bracket 101 with the rib 44 as a reference.

For example, depending on the position (interval) between the bolt holes 23c and 23c (

bolt holes

33a and 33a) of the seat lock device 13 and the bolt holes 104 and 104 of the bracket 101, the groove 41 (groove 21a , 31 a) is assumed to act on the seat lock device 13. In addition, even when the seat 10 is twisted for some reason, it is assumed that the force that expands the groove 41 (grooves 21a and 31a) acts on the seat lock device 13 due to the twist. If the groove 41 of the lock case 40 is expanded, the seat lock device 13 may be deformed. In order to suppress this deformation, the seat lock device 13 of the present example employs the following configuration.

As shown in FIG. 17, in a state where the seat lock device 13 is attached to the bracket 101, the caulking head 51b of the pole pin 51 is inserted into the insertion hole 103b of the bracket 101. As shown in FIG. 18, the caulking head 52 b of the hook pin 52 is inserted into the insertion hole 103 a of the bracket 101 in a state where the seat lock device 13 is attached to the bracket 101. For this reason, even if the force which expands the groove part 41 (groove part 21a, 31a) acts on the seat locking device 13, this force is caused when the caulking heads 51b, 52b engage with the insertion holes 103b, 103a of the bracket 101, respectively. It is accepted. Thereby, the deformation of the seat lock device 13 is suppressed, and the holding strength of the seat lock device 13 with respect to the bracket 101 is ensured.

The present embodiment may be modified as follows.
In this example, the hook 53 is rotated in conjunction with the movement of the pop-up piece 56 by the engagement between the pin 65 of the hook 53 and the engagement hole 93 of the pop-up piece 56. It does not have to be linked. That is, the engagement hole 93 of the pop-up piece 56 and the pin 65 of the hook 53 may be omitted. In this case, an elastic member that urges the hook 53 to always rotate in the unlocking direction may be provided.

In this example, the striker 14 is provided on the vehicle body, and the seat lock device 13 is provided on the seat back 12. However, the following may be used. That is, the seat lock device 13 may be provided on the vehicle body and the striker 14 may be provided on the seat back 12. Alternatively, the seat lock device 13 may be provided on the seat cushion 11, and the striker 14 may be provided on the floor surface of the vehicle body. Alternatively, the striker 14 may be provided on the seat cushion 11 and the seat lock device 13 may be provided on the floor surface of the vehicle body.

Claims

A base that has a groove portion that is provided on one of the seat and the vehicle body that are locked to each other and that receives a striker that is provided on the other of the seat and the vehicle body;
A case provided facing the base and having a groove for receiving the striker;
A hook that is rotatably supported between the base and the case and forms a locked state in which the striker is sandwiched between a groove portion of the case;
A cam that is rotatably supported between the base and the case and holds the hook in a locked state by engaging a portion of the hook;
A pressing member provided between the base and the case so as to be movable in the approach direction of the striker and capable of contacting the striker, and constantly biased in a direction opposite to the approach direction of the striker;
A pawl that is rotatably supported between the base and the case and receives a biasing force of the pressing member that acts in a direction opposite to the direction in which the striker enters by engaging a part of the pressing member. Seat lock device.
In the seat lock device according to claim 1,
When viewed from the axial direction of the rotation center axis of the pole, the pole is constantly urged in a direction rotating toward the groove portion of the case,
A portion of the pole that engages with the pressing member is provided with an arc surface centered on the rotation center axis of the pole, and a portion of the pressing member that engages with the pole includes an arc surface of the pole. A seat lock device provided with a circular arc surface corresponding to.
The seat lock device according to claim 1 or 2,
The hook has a protrusion on an axial side surface of the rotation center axis thereof, and the pressing member has an engagement hole that engages with the protrusion of the hook,
When the pressing member moves in the striker entry direction or in the direction opposite to the entry direction, the hook is rotated in the lock direction or the unlock direction by the engagement between the protrusion and the engagement hole. .
In the seat lock device according to claim 3,
The hook is pressed in the locking direction by the engagement between the cam and a part of the hook, so that the protrusion of the hook is kept away from the engagement hole of the pressing member. Locking device.
In the seat lock device according to any one of claims 1 to 4,
The hook has a restraining groove that receives the striker as a groove between the first protrusion and the second protrusion,
The cam has a first restricting portion that restricts rotation in the unlocking direction of the hook by engaging the first protrusion of the hook.
The pawl has a second restricting portion that restricts rotation of the hook in the unlocking direction by engaging with a second projecting portion of the hook held in a locked state.
In the seat lock device according to claim 5,
The seat lock device, wherein the cam partially overlaps the second protrusion of the hook in the axial direction of the rotation center axis of the hook kept in a locked state.