Vehicle seat lock device

Abstract

To provide a vehicle seat lock device that has excellent operability, and can be miniaturized while preventing a striker from rattling at a latch position.SOLUTION: A vehicle seat lock device 4 includes a latch 42 and a wedge 43 which are rotatable around a first rotational axis 411. The wedge 43 is slidable in a first direction. A latch body part 421 and a wedge body part 431 are arranged such that at least portions of them overlap each other when viewed in the axial direction. A latch groove 422 and a wedge groove 432 are formed at positions where at least portions of them overlap with each other when viewed in the axial direction. An outer end part 432d in the radial direction of a first wedge support wall 432a is located at a position overlapping with the latch body part 421 when viewed in the axial direction. The wedge 43 slides in the first direction as a striker 5 approaches the first latch position P1, and the first wedge support wall 432a approaches first latch support wall 422a in the circumferential direction.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a vehicle seat lock device, and more particularly to a vehicle seat lock device capable of changing the angle of a seat back in two stages. [Background technology]

[0002] Conventionally, there has been known a vehicle seat lock device capable of changing the angle of a seat back of a vehicle seat in two stages. The vehicle seat lock device capable of changing the angle of the seat back in two stages is attached to one of the vehicle body and the seat back, and includes a latch capable of engaging with a striker attached to the other of the vehicle body and the seat back. The latch is capable of holding the striker at a first latch position in a first holding position, and is capable of holding the striker at a second latch position in a second holding position.

[0003] In this type of vehicle seat lock device, there is a problem that rattle is likely to occur between the striker and the latch when the striker is held in the first latch position or the second latch position. If rattle occurs between the striker and the latch, the seat back will rattle while the vehicle is moving, which may cause discomfort to the occupants.

[0004] In order to address the issue of rattle being likely to occur between the striker and the latch, for example, Patent Document 1 describes a structure in which a slide wedge is provided on the latch and the striker is actively brought into contact with the slide wedge, thereby suppressing rattle that occurs between the striker and the latch in the latched position.

[0005] Furthermore, for example, Patent Document 2 describes a structure in which an engagement assistance lever is brought into contact with an abutment portion provided on the latch, thereby moving the latch from a first holding position toward a second holding position. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 3387877 [Patent Document 2] JP 2022-189571 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the vehicle seat lock device described in Patent Document 1, when switching from a latched state to an unlatched state, the striker is difficult to remove from the slide wedge, which may make the operation difficult. Also, in the vehicle seat lock device described in Patent Document 2, in preparation for the case where the latch is excessively pushed in by the striker, it is necessary to make the cushion of the arm that the striker of the engagement assist lever abuts large, which causes a problem that the front-to-rear dimension of the vehicle seat lock device becomes large.

[0008] The present invention provides a vehicle seat lock device that is excellent in operability and can be made compact while preventing a striker from rattling at a latched position. [Means for solving the problem]

[0009] The first aspect of the present invention is A vehicle seat lock device that is attached to one of a vehicle body and a seat back and is engageable with a striker that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position, and the striker can be held at a second latch position different from the first latch position, A base plate having a striker entry groove into which the striker enters and retreats in accordance with the movement of the seat back; A first rotation shaft provided on the base plate; a latch supported by the first rotating shaft and rotatable about the first rotating shaft; a wedge that is supported by the first rotating shaft so as to be slidable in a first direction perpendicular to an axial direction of the first rotating shaft and that is rotatable about the first rotating shaft; The latch is a latch body portion; and a latch groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, into which the striker advances and retreats, When the striker is in a first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; when in a second retaining position, retaining the striker in the second latched position; The wedge is A wedge groove having a concave shape recessed from an outer circumferential edge of the wedge body portion as viewed in the axial direction, into which the striker advances and retreats, The latch and the wedge rotate together, the latch body portion and the wedge body portion are disposed at positions where they at least partially overlap each other when viewed in the axial direction, The latch groove and the wedge groove are formed at positions where they at least partially overlap each other when viewed in the axial direction, the latch groove is a space surrounded by a first latch support wall formed by the latch body portion and extending in a radial direction of the first pivot shaft on a retraction side of the striker in the circumferential direction of the first pivot shaft, a second latch support wall extending in the radial direction on an engagement side of the striker in the circumferential direction, and a latch bottom wall portion connecting an inner end portion of the first latch support wall in the radial direction and an inner end portion of the second latch support wall in the radial direction, the wedge groove is a space surrounded by a first wedge support wall formed by the wedge body portion and extending in the radial direction on a retraction side of the striker in the circumferential direction, a second wedge support wall extending in the radial direction on an engagement side of the striker in the circumferential direction, and a wedge bottom wall portion connecting an inner end portion of the first wedge support wall and an inner end portion of the second wedge support wall in the radial direction, the radially outer end portion of the first wedge support wall is located at a position overlapping the latch body portion as viewed in the axial direction, The wedge slides in the first direction as the striker moves in and out of the wedge groove, and the closer the striker gets to the first latch position, the closer the first wedge support wall slides in the first direction to the first latch support wall in the circumferential direction.

[0010] A second aspect of the present invention is A vehicle seat lock device that is attached to one of a vehicle body and a seat back and is engageable with a striker that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position, and the striker can be held at a second latch position different from the first latch position, A base plate having a striker entry groove into which the striker enters and retreats in accordance with the movement of the seat back; A first rotation shaft provided on the base plate; a latch supported by the first rotating shaft and rotatable about the first rotating shaft; a second rotation shaft provided on the base plate and extending parallel to the first rotation shaft; a link lever supported by the second rotating shaft and rotatable about the second rotating shaft; a third rotation shaft provided on the base plate and extending parallel to the first rotation shaft and the second rotation shaft; A ratchet and a cam are supported by the third rotating shaft and are rotatable about the third rotating shaft. The latch is A latch body portion; a latch groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in an axial direction of the first rotation shaft, into which the striker advances and retreats; a first ratchet engagement groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, with which the ratchet engages when the latch body portion is in a first holding position; a second ratchet engagement groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, with which the ratchet engages when the latch body portion is in a second holding position; When the striker is in the first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; When in the second retaining position, the striker is retained in the second latched position; The latch body portion is a striker abutment portion that abuts against the striker to hold the striker at the second latch position when the latch is in the second holding position; a cam abutment portion with which the cam abuts when the latch rotates in a second direction from the first holding position toward the second holding position, The link lever is a striker holding arm extending in a radial direction of the second pivot shaft, capable of coming into contact with the striker, and configured to hold the striker in the second latch position by clamping the striker together with the striker abutment portion of the latch when the striker is in the second latch position, The ratchet is a latch engaging groove for engaging with the first ratchet engagement groove of the latch to hold the latch at the first retention position, and a latch engaging groove for engaging with the second ratchet engagement groove of the latch to hold the latch at the second retention position; The cam is the latch is abutted against the cam abutment portion of the latch to rotate in the second direction to a position beyond the second holding position, and the latch is pressed in the second direction toward a direction beyond the second holding position, The vehicle seat lock device includes: When the striker abuts against the striker holding arm of the link lever, the link lever rotates about the second rotation shaft, The striker abuts against the striker holding arm, causing the link lever to rotate about the second rotation shaft, thereby rotating the latch in the second direction toward the second holding position, When the latch rotates in the second direction, the cam abuts against the cam abutment portion of the latch to rotate the latch in the second direction to a position beyond the second holding position, and then the latch is pressed in the second direction at the second holding position, The striker is clamped between the striker holding arm of the link lever and the striker abutment portion of the latch to hold the striker at the second latch position.

[0011] A third aspect of the present invention is A vehicle seat lock device that is attached to one of a vehicle body and a seat back and is engageable with a striker that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position, and the striker can be held at a second latch position different from the first latch position, A base plate having a striker entry groove into which the striker enters and retreats in accordance with the movement of the seat back; A first rotation shaft provided on the base plate; a latch supported by the first rotating shaft and rotatable about the first rotating shaft; a wedge supported by the first rotation shaft so as to be slidable in a first direction perpendicular to an axial direction of the first rotation shaft and rotatable about the first rotation shaft; a second rotation shaft provided on the base plate and extending parallel to the first rotation shaft; a link lever supported by the second rotating shaft and rotatable about the second rotating shaft; a third rotation shaft provided on the base plate and extending parallel to the first rotation shaft and the second rotation shaft; A ratchet and a cam are supported by the third rotating shaft and are rotatable about the third rotating shaft. The latch is A latch body portion; a latch groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, into which the striker advances and retreats; a first ratchet engagement groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, with which the ratchet engages when the latch body portion is in a first holding position; a second ratchet engagement groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, with which the ratchet engages when the latch body portion is in a second holding position; When the striker is in the first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; When in the second retaining position, the striker is retained in the second latched position; The latch body portion is a striker abutment portion that abuts against the striker to hold the striker at the second latch position when the latch is in the second holding position; a cam abutment portion with which the cam abuts when the latch rotates in a second direction from the first holding position toward the second holding position, The wedge is A wedge groove having a concave shape recessed from an outer circumferential edge of the wedge body portion as viewed in the axial direction, into which the striker advances and retreats, The latch and the wedge rotate together, the latch body portion and the wedge body portion are disposed at positions where they at least partially overlap each other when viewed in the axial direction, The latch groove and the wedge groove are formed at positions where they at least partially overlap each other when viewed in the axial direction, the latch groove is a space surrounded by a first latch support wall formed by the latch body portion and extending in a radial direction of the first pivot shaft on a retraction side of the striker in the circumferential direction of the first pivot shaft, a second latch support wall extending in the radial direction on an engagement side of the striker in the circumferential direction, and a latch bottom wall portion connecting an inner end portion of the first latch support wall in the radial direction and an inner end portion of the second latch support wall in the radial direction, the wedge groove is a space surrounded by a first wedge support wall formed by the wedge body portion and extending in the radial direction on a retraction side of the striker in the circumferential direction, a second wedge support wall extending in the radial direction on an engagement side of the striker in the circumferential direction, and a wedge bottom wall portion connecting an inner end portion of the first wedge support wall and an inner end portion of the second wedge support wall in the radial direction, the radially outer end portion of the first wedge support wall is located at a position overlapping the latch body portion as viewed in the axial direction, the wedge slides in the first direction as the striker advances and retreats in the wedge groove, and slides in the first direction such that the first wedge support wall approaches the first latch support wall in the circumferential direction as the striker approaches the first latch position; The link lever is a striker holding arm extending in a radial direction of the second pivot shaft, capable of coming into contact with the striker, and configured to hold the striker in the second latch position by clamping the striker together with the striker abutment portion of the latch when the striker is in the second latch position, The ratchet is a latch engaging groove for engaging with the first ratchet engagement groove of the latch to hold the latch at the first retention position, and a latch engaging groove for engaging with the second ratchet engagement groove of the latch to hold the latch at the second retention position; The cam is the latch is abutted against the cam abutment portion of the latch to rotate in the second direction to a position beyond the second holding position, and the latch is pressed in the second direction toward a direction beyond the second holding position, The vehicle seat lock device includes: When the striker abuts against the striker holding arm of the link lever, the link lever rotates about the second rotation shaft, The striker abuts against the striker holding arm, causing the link lever to rotate about the second rotation shaft, thereby rotating the latch in the second direction toward the second holding position, When the latch rotates in the second direction, the cam abuts against the cam abutment portion of the latch to rotate the latch in the second direction to a position beyond the second holding position, and then the latch is pressed in the second direction at the second holding position, The striker is clamped between the striker holding arm of the link lever and the striker abutment portion of the latch to hold the striker at the second latch position. Effect of the Invention

[0012] According to the present invention, it is possible to prevent the striker from rattling at the latched position and to achieve a reduction in size. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of a seat to which a vehicle seat lock device 4 according to an embodiment of the present invention is attached. [Diagram 2] FIG. 1 is a perspective view of a vehicle seat lock device 4 according to an embodiment of the present invention, as viewed obliquely from above. [Diagram 3] FIG. 1 is a perspective view of a vehicle seat lock device 4 according to one embodiment of the present invention, seen obliquely from below in a state in which a first rotating shaft, a second rotating shaft, a third rotating shaft, and a tension coil spring are omitted. [Figure 4] FIG. 2 is a side view of a vehicle seat lock device 4A according to one embodiment of the present invention, viewed from the left, in a state in which the latch is in an unlatched position. [Diagram 5] FIG. 2 is a side view of a vehicle seat lock device 4A according to one embodiment of the present invention, seen from the left, showing a state in which a latch is transitioning from an unlatched position to a first retaining position. [Figure 6] FIG. 2 is a side view of a vehicle seat lock device 4A according to one embodiment of the present invention, when the latch is in a first retaining position, as viewed from the left. [Figure 7]FIG. 2 is a side view seen from the left in a state in which an operating member is operated while the latch is in a first retaining position in a vehicle seat lock device 4A according to one embodiment of the present invention. [Figure 8] FIG. 11 is a side view, viewed from the left, of a vehicle seat lock device 4A according to one embodiment of the present invention, showing a state in which the latch is transitioning from a first retention position to a second retention position and the striker abuts against the striker retention arm of the link lever. [Figure 9] FIG. 11 is a side view of a vehicle seat lock device 4A according to one embodiment of the present invention, showing a state in which the latch is transitioning from a first retention position to a second retention position and the second leg of the torsion coil spring abuts against the latch, as viewed from the left. [Figure 10] FIG. 1 is a side view of a vehicle seat lock device 4A according to one embodiment of the present invention, showing a state in which the latch is transitioning from a first retention position to a second retention position and the latch has been rotated by a cam to a position beyond the second retention position, as viewed from the left. [Figure 11] FIG. 2 is a side view of a vehicle seat lock device 4A according to one embodiment of the present invention, when the latch is in a second retaining position, as viewed from the left. [Figure 12] FIG. 11 is a side view of a modified link lever in a vehicle seat lock device 4A according to one embodiment of the present invention, as viewed from the left. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the vehicle seat lock device of the present invention will be described with reference to the attached drawings. The drawings are to be viewed in the direction of the reference symbols. In this specification and the like, for the sake of simplicity and clarity, the front / rear, left / right, and up / down directions are described according to the direction as seen by the driver of the vehicle, and in the drawings, the front of the vehicle is indicated as Fr, the rear as Rr, the left as L, the right as R, the top as U, and the bottom as D.

[0015] [Vehicle seat lock device peripheral configuration] As shown in FIG. 1, a vehicle seat lock device 4 of this embodiment is attached to the left side surface of a rear seat 2 provided in a vehicle.

[0016] The rear seat 2 includes a seat cushion 3A on which an occupant can be seated, and a seat back 3B supported so as to be able to be raised and lowered in the fore-and-aft direction around a hinge shaft (not shown) extending in the left-right direction provided at the lower rear end of the seat cushion 3A.

[0017] A striker 5 is attached to the vehicle body. The striker 5 has a generally U-shape facing the left side surface of the seat back 3B. The striker 5 includes a first leg 51 extending in the left-right direction at the front side, and a second leg 52 extending in the left-right direction a predetermined distance rearward of the first leg 51.

[0018] The vehicle seat lock device 4 engages with the striker 5 to hold the seat back 3B in a first position shown by a solid line in Fig. 1 and a second position tilted backward from the first position shown by a two-dot chain line in Fig. 1. In this way, the vehicle seat lock device 4 engages with the striker 5 to hold the seat back 3B switchably at two angles.

[0019] In addition, the seat back 3B can be selectively held in either the first position or the second position as described above, and by operating the operating member 6 provided on the shoulder portion of the seat back 3B, the engagement between the vehicle seat lock device 4 and the striker 5 can be released, and the seat back can be moved forward to a collapsed position as shown by the two-dot chain line in FIG. 1.

[0020] [Vehicle seat lock configuration] As shown in Fig. 2 and Fig. 3, the vehicle seat lock device 4 includes a base plate 41 fixed to the seat back 3B. The base plate 41 is provided with a striker entrance groove 41a into which the striker 5 enters and retreats as the seat back 3B moves. The striker entrance groove 41a extends in the front-rear direction and is open at the rear. As the seat back 3B is raised or lowered, the first leg 51 and the second leg 52 of the striker 5 can enter and retreat into the striker entrance groove 41a from the rear, and can move in the front-rear direction inside the striker entrance groove 41a.

[0021] The vehicle seat lock device 4 is capable of holding the striker 5 at a first latch position P1, and is also capable of holding the striker 5 at a second latch position P2 rearward of the first latch position P1.

[0022] The base plate 41 is provided with a first rotating shaft 411 having an axial direction in the left-right direction below the striker entrance groove 41a at a position not overlapping with the striker entrance groove 41a when viewed from the inside in the vehicle width direction, i.e., the right direction. The base plate 41 is provided with a second rotating shaft 412 having an axial direction in the left-right direction above the striker entrance groove 41a and rearward of the first rotating shaft 411 at a position not overlapping with the striker entrance groove 41a when viewed from the inside in the vehicle width direction, i.e., the right direction. The base plate 41 is provided with a third rotating shaft 413 having an axial direction in the left-right direction above the striker entrance groove 41a and forward of the first rotating shaft 411 at a position not overlapping with the striker entrance groove 41a when viewed from the inside in the vehicle width direction, i.e., the right direction.

[0023] This allows the front-rear dimension of the vehicle seat lock device 4 to be shortened, so that the device can be easily attached to a thin seat back 3B.

[0024] A latch 42 and a wedge 43 are supported on the first rotating shaft 411. A link lever 44 is supported on the second rotating shaft 412. A ratchet 45 and a cam 46 are supported on the third rotating shaft 413.

[0025] The latch 42 is pivotally supported by a first rotating shaft 411 and is rotatable about the first rotating shaft 411. When in the first holding position, the latch 42 holds the striker 5 at a first latch position P1, and when in the second holding position, the latch 42 holds the striker 5 at a second latch position P2.

[0026] The latch 42 comprises a latch body portion 421, a latch groove 422 having a concave shape recessed from the outer circumferential edge of the latch body portion 421 when viewed in the axial direction of the first pivot shaft 411, through which the striker 5 advances and retreats, a first ratchet engagement groove 423 having a concave shape recessed from the outer circumferential edge of the latch body portion 421 when viewed in the axial direction of the first pivot shaft 411, with which the ratchet 45 engages when in the first holding position, and a second ratchet engagement groove 424 having a concave shape recessed from the outer circumferential edge of the latch body portion 421 when viewed in the axial direction of the first pivot shaft 411, with which the ratchet 45 engages when in the second holding position.

[0027] When viewed from the inside in the vehicle width direction, i.e., from the right, the latch 42 is provided with a first ratchet engagement groove 423 on the clockwise side of the latch groove 422, and a second ratchet engagement groove 424 on the counterclockwise side of the latch groove 422.

[0028] The latch body portion 421 is provided with an insertion hole 421a through which the first rotating shaft 411 is inserted. The insertion hole 421a is a round hole through which the first rotating shaft 411 can be inserted and has approximately the same diameter as the first rotating shaft 411 and penetrates in the left-right direction.

[0029] A slide pin 421b protruding to the right is provided on the latch body portion 421. The slide pin 421b is provided such that the latch groove 422 is located between the axis of the first rotating shaft 411 and the center of the slide pin 421b in the direction of a first imaginary line VL1 (see FIG. 4) connecting the axis of the first rotating shaft 411 and the center of the slide pin 421b when viewed from the axial direction of the first rotating shaft 411. The slide pin 421b protrudes to the right from the latch body portion 421 in a substantially cylindrical shape.

[0030] The latch groove 422 is a space formed by a first latch support wall 422a formed by the latch body portion 421 and extending radially of the first pivot shaft 411 on the retraction side of the striker 5 in the circumferential direction of the first pivot shaft 411, i.e., the rear side, a second latch support wall 422b extending radially of the first pivot shaft 411 on the engagement side of the striker 5 in the circumferential direction of the first pivot shaft 411, i.e., the front side, and a latch bottom wall portion 422c connecting the radial inner end of the first pivot shaft 411 at the first latch support wall 422a and the radial inner end of the first pivot shaft 411 at the second latch support wall 422b.

[0031] The latch body portion 421 has a striker abutment portion 421c that abuts against the striker 5 to hold the striker 5 at the second latch position P2 when the latch 42 is in the second holding position, a first cam abutment portion 421d1 that abuts against the cam 46 when the latch 42 is in the first holding position, and a second cam abutment portion 421d2 that abuts against the cam 46 when the latch 42 is in the second holding position.

[0032] The striker abutment portion 421c is formed on the outer circumferential edge of the latch body portion 421 between the latch groove 422 and the second ratchet engagement groove 424 in the circumferential direction of the first rotating shaft 411. The first cam abutment portion 421d1 is formed near the radially outer end of the first rotating shaft 411 in the second latch support wall 422b of the latch groove 422. The second cam abutment portion 421d2 is formed on the outer circumferential edge of the latch body portion 421 on the inner side in the vehicle width direction, that is, on the counterclockwise side of the second ratchet engagement groove 424 when viewed from the rightward direction, in the circumferential direction of the first rotating shaft 411.

[0033] The latch 42 is biased by a torsion coil spring 425 in a counterclockwise direction of the first rotating shaft 411 when viewed inward in the vehicle width direction, that is, from the right side.

[0034] The wedge 43 is disposed on the right side of the latch 42, journaled so as to be slidable in a first direction perpendicular to the axial direction of the first rotating shaft 411, and rotatable about the first rotating shaft 411. The first direction is the inner side in the vehicle width direction, that is, a direction inclined by about 5 degrees to 30 degrees clockwise with respect to the recessed direction of the latch groove 422 of the latch 42 when viewed from the right side.

[0035] The wedge 43 has a wedge body portion 431 and a wedge groove 432 that has a concave shape recessed from the outer circumferential edge of the wedge body portion 431 when viewed in the axial direction of the first rotating shaft 411, and into which the striker 5 advances and retreats.

[0036] The latch 42 and the wedge 43 rotate integrally, and the latch body portion 421 and the wedge body portion 431 are disposed in positions where they at least partially overlap each other when viewed from the axial direction of the first rotating shaft 411. The latch groove 422 and the wedge groove 432 are formed in positions where they at least partially overlap each other when viewed from the axial direction of the first rotating shaft 411.

[0037] This allows the dimensions of the vehicle seat lock device 4 as viewed in the up-down direction or the front-rear direction to be reduced, and the vehicle seat lock device 4 can be made compact.

[0038] The wedge body portion 431 has an elongated hole shape with the first direction as the longitudinal direction when viewed from the axial direction of the first rotating shaft 411, and a rotating shaft slide hole 431a is formed penetrating in the axial direction of the first rotating shaft 411. The first rotating shaft 411 is inserted into the rotating shaft slide hole 431a so as to be slidable in the first direction.

[0039] The wedge body portion 431 has an elongated hole shape with the first direction as the longitudinal direction when viewed from the axial direction of the first rotating shaft 411, and is formed with a pin slide hole 431b penetrating in the axial direction of the first rotating shaft 411. A slide pin 421b provided on the latch 42 is inserted into the pin slide hole 431b so as to be slidable in the first direction.

[0040] In this manner, the wedge 43 is engaged with the first pivot shaft 411 and the latch 42 so as to be slidable in the first direction.

[0041] The wedge groove 432 is a space formed by the wedge body portion 431, and is surrounded by a first wedge support wall 432a extending radially of the first pivot shaft 411 on the retraction side of the striker 5 in the circumferential direction of the first pivot shaft 411, i.e., the rear side, a second wedge support wall 432b extending radially of the first pivot shaft 411 on the engagement side of the striker 5 in the circumferential direction of the first pivot shaft 411, i.e., the front side, and a wedge bottom wall portion 432c connecting the radial inner end of the first pivot shaft 411 at the first wedge support wall 432a and the radial inner end of the first pivot shaft 411 at the second wedge support wall 432b.

[0042] An outer end 432d of the first wedge support wall 432a in the radial direction of the first rotating shaft 411 is located at a position overlapping the latch body portion 421 when viewed from the axial direction of the first rotating shaft 411.

[0043] The wedge 43 is biased in the first direction against the latch 42 by a compression coil spring 433 extending in the first direction. The compression coil spring 433 is attached to the opposite side of the latch groove 422 and the wedge groove 432 across the first rotating shaft 411. One end of the compression coil spring 433 located on the radially outer side of the first rotating shaft 411 abuts against the latch 42, and the other end of the compression coil spring 433 located on the radially inner side of the first rotating shaft 411 abuts against the wedge 43. The wedge 43 is biased by the compression coil spring 433 against the latch 42 toward the side where the latch groove 422 in the first direction is located.

[0044] The link lever 44 is supported by a second rotating shaft 412 and is rotatable about the second rotating shaft 412 .

[0045] The link lever 44 comprises a striker retaining arm 441 extending radially from the second pivot shaft 412, and a latch drive arm 442 which is provided on the counterclockwise side of the striker retaining arm 441 with the second pivot shaft 412 as its axis when viewed from the inside in the vehicle width direction, i.e., from the right side, and extends radially from the second pivot shaft 412.

[0046] The striker holding arm 441 is capable of coming into contact with the striker 5, and when the striker 5 is in the second latch position P2, it clamps the striker 5 together with the striker abutment portion 421c of the latch 42 to hold the striker 5 in the second latch position P2.

[0047] A torsion coil spring 443 is engaged with the link lever 44, which biases the link lever 44 in a clockwise direction of the second rotating shaft 412 when viewed from the inside in the vehicle width direction, that is, from the right direction.

[0048] The torsion coil spring 443 includes a coil portion 443a wound around the second rotating shaft 412, a first leg portion 443b1 extending radially outward from the coil portion 443a about the second rotating shaft 412 and engaging with the base plate 41, and a second leg portion 443b2 extending radially outward from the coil portion 443a about the second rotating shaft 412 and engaging with the tip portion of the latch drive arm 442 of the link lever 44.

[0049] The ratchet 45 is supported by a third rotating shaft 413 and is rotatable about the third rotating shaft 413 .

[0050] The ratchet 45 includes a ratchet body portion 451 and an engagement arm 452 that engages with the first ratchet engagement groove 423 and the second ratchet engagement groove 424 of the latch 42 .

[0051] The ratchet body portion 451 extends rearward from the third rotating shaft 413 and radially outward from the third rotating shaft 413 .

[0052] The ratchet body portion 451 is provided with an insertion hole 451a through which the third rotating shaft 413 is inserted. The insertion hole 451a is a round hole through which the third rotating shaft 413 can be inserted and has approximately the same diameter as the third rotating shaft 413 and penetrates in the left-right direction.

[0053] The ratchet body portion 451 is formed with a pin slide hole 451b that extends in the circumferential direction of the third rotating shaft 413 and penetrates the third rotating shaft 413 in the axial direction.

[0054] The engagement arm 452 extends from the ratchet body portion 451 toward the radially outer side of the third rotating shaft 413, and an engagement portion 452a is formed at the radially outer end portion thereof, protruding in the circumferential direction toward the latch 42. Therefore, when viewed from the axial direction of the third rotating shaft 413, the engagement arm 452 is substantially L-shaped with the engagement portion 452a curved in an arc shape.

[0055] The ratchet 45 can hold the latch 42 in a first holding position by engaging the engagement portion 452a of the engagement arm 452 with the first ratchet engagement groove 423, and can hold the latch 42 in a second holding position by engaging the engagement portion 452a of the engagement arm 452 with the second ratchet engagement groove 424 of the latch 42.

[0056] The ratchet 45 is biased by a torsion coil spring 453 in a clockwise direction of the third rotating shaft 413 when viewed inward in the vehicle width direction, that is, from the right side.

[0057] The cam 46 is disposed on the right side of the ratchet 45 and is journalled to the third rotating shaft 413 so as to be rotatable about the third rotating shaft 413 .

[0058] The cam 46 has a cam body portion 461. The cam body portion 461 extends rearward from the third rotating shaft 413 and radially outward from the third rotating shaft 413.

[0059] The cam body portion 461 is provided with an insertion hole 461a through which the third rotating shaft 413 is inserted. The insertion hole 461a is a round hole through which the third rotating shaft 413 can be inserted and has approximately the same diameter as the third rotating shaft 413 and penetrates in the left-right direction.

[0060] The cam body portion 461 has a pin slide hole 461b that extends circumferentially around the third rotating shaft 413 and penetrates the third rotating shaft 413 in the axial direction, at a position where at least a portion of the pin slide hole 451b of the ratchet 45 overlaps when viewed from the axial direction of the third rotating shaft 413.

[0061] The cam body portion 461 abuts against the first cam abutment portion 421d1 of the latch 42 when the latch 42 is in the first holding position. The cam body portion 461 abuts against the second cam abutment portion 421d2 of the latch 42 when the latch 42 is in the second holding position.

[0062] The cam 46 is biased by a torsion coil spring 462 in a clockwise direction of the third rotating shaft 413 when viewed inward in the vehicle width direction, that is, from the right side.

[0063] A release lever 47 is further supported on the third rotating shaft 413 to the right of the cam 46 so as to be rotatable about the third rotating shaft 413. The release lever 47 extends from the third rotating shaft 413 obliquely upward and forward, radially outward from the third rotating shaft 413.

[0064] The release lever 47 extends from the third rotating shaft 413 to the outside in the radial direction of the third rotating shaft 413 so that at least a portion of the release lever 47 overlaps with the pin slide hole 451 b of the ratchet 45 and the pin slide hole 461 b of the cam 46 .

[0065] A slide pin 47a protruding leftward is provided on the release lever 47. The slide pin 47a protrudes leftward in a generally cylindrical shape and passes through a pin slide hole 451b of the ratchet 45 and a pin slide hole 461b of the cam .

[0066] The release lever 47 is provided with an engagement pin 47b that protrudes rightward near the radial tip of the third rotating shaft 413. The engagement pin 47b protrudes rightward in a substantially cylindrical shape.

[0067] The release lever 47 is biased by a tension coil spring 471 toward the inside in the vehicle width direction, that is, in the clockwise direction of the third rotating shaft 413 when viewed from the right side.

[0068] The engagement pin 47b of the release lever 47 is engaged with the drive lever 61 of the operating member 6.

[0069] [Configuration of operation parts] In this embodiment, the operating member 6 is attached to the upper part of the base plate 41, and the drive lever 61 extends in the vertical direction.

[0070] When the operating member 6 is operated by a passenger or the like, the drive lever 61 rotates toward the inside in the vehicle width direction, that is, in the clockwise direction when viewed from the right side.

[0071] An engagement hole 61a extending in the vertical direction and penetrating in the left-right direction is formed in the drive lever 61. The engagement pin 47b of the release lever 47 is inserted into the engagement hole 61a, so that the engagement pin 47b of the release lever 47 engages with the drive lever 61.

[0072] [Operation of vehicle seat lock device] Next, the operation of the vehicle seat lock device 4A will be described with reference to Figures 4 to 11. The vehicle seat lock device 4A is attached to the right side of the rear seat 2 provided in the vehicle, and has a shape and structure that is a mirror image (symmetrical) of the vehicle seat lock device 4 with respect to a plane perpendicular to the left-right direction. The components of the vehicle seat lock device 4A are given the same reference numerals as the corresponding components of the vehicle seat lock device 4, and the description thereof will be omitted or simplified.

[0073] (unlatched position) As shown in Fig. 4, when the seat back 3B is at a position other than the first position and the second position and the striker 5 does not enter the striker entrance groove 41a of the base plate 41, the latch 42 is stopped at the unlatched position. When the latch 42 is at the unlatched position, at least a part of the second latch support wall 422b of the latch groove 422 is located in the striker entrance groove 41a when viewed from the inside in the vehicle width direction, i.e., from the left direction. Furthermore, when the latch 42 is at the unlatched position, the wedge 43 is disposed such that, in the circumferential direction of the first pivot shaft 411, the first wedge support wall 432a of the wedge groove 432 is closer to the second latch support wall 422b of the latch groove 422 than the first latch support wall 422a of the latch groove 422, i.e., the first wedge support wall 432a of the wedge groove 432 is located inside the latch groove 422 when viewed from the axial direction of the first pivot shaft 411.

[0074] (Transition from unlatched position to first holding position) 5, when the seat back 3B is raised, the first leg 51 of the striker 5 enters the striker entrance groove 41a from the rear. Then, the first leg 51 of the striker 5 abuts against the second latch support wall 422b of the latch groove 422 from the rear, and rotates the latch 42 toward the inside in the vehicle width direction, i.e., in the counterclockwise direction as viewed from the left side, against the biasing force of the torsion coil spring 425. Furthermore, together with the rotation of the latch 42, the wedge 43 also rotates toward the inside in the vehicle width direction, i.e., in the counterclockwise direction as viewed from the left side.

[0075] When the first leg 51 advances further forward into the striker entrance groove 41a, as the latch 42 and wedge 43 rotate, the first leg 51 advances radially inward of the first pivot shaft 411 further than the first latch support wall 422a of the latch groove 422 and the first wedge support wall 432a of the wedge groove 432.

[0076] At this time, the radial outer end 432d of the first wedge support wall 432a is located at a position overlapping with the latch body portion 421 when viewed from the axial direction of the first pivot shaft 411, so that the first leg portion 51 can be prevented from getting caught on the radial outer end 432d of the first wedge support wall 432a when entering radially inward of the first pivot shaft 411 further than the first latch support wall 422a of the latch groove 422 and the first wedge support wall 432a of the wedge groove 432.

[0077] Moreover, since the first wedge support wall 432a is located closer to the second latch support wall 422b of the latch groove 422 than the first latch support wall 422a, that is, inside the latch groove 422 when viewed from the axial direction of the first rotating shaft 411, the first leg 51 abuts against the first wedge support wall 432a. Then, the first wedge support wall 432a with which the first leg 51 abuts presses the first leg 51 in a direction approaching the second latch support wall 422b, and the wedge 43 with which the first leg 51 abuts is pressed by the first leg 51, so that the first wedge support wall 432a slides in the first direction in the circumferential direction of the first rotating shaft 411 so as to approach the first latch support wall 422a.

[0078] In this way, as the striker 5 presses the first wedge support wall 432a, the wedge 43 slides in the first direction so that the first wedge support wall 432a approaches the first latch support wall 422a in the circumferential direction of the first rotating shaft 411 as the striker 5 advances further forward into the striker entrance groove 41a and approaches the first latch position P1. By sliding the wedge in the first direction in this way, the amount of sliding can be reduced compared to sliding the first wedge support wall 432a in the first direction so as not to approach the first latch support wall 422a in the circumferential direction of the first rotating shaft 411. Therefore, the radial outer end 432d of the first wedge support wall 432a can be positioned at a position overlapping with the latch body portion 421 when viewed from the axial direction of the first rotating shaft 411.

[0079] At this time, as described above, the slide pin 421b is arranged so that, when viewed from the axial direction of the first pivot shaft 411, the latch groove 422 is positioned between the axis of the first pivot shaft 411 and the center of the slide pin 421b in the direction of the first virtual line VL1 (see Figure 4) connecting the axis of the first pivot shaft 411 and the center of the slide pin 421b. Therefore, the wedge 43 can be slid in the first direction with precision relative to the latch groove 422 of the latch 42, and the wedge 43 can be easily arranged because the first leg 51 of the striker 5 does not get in the way when engaging with the latch groove 422 of the latch 42 and the wedge groove 432 of the wedge 43.

[0080] (1st holding position) When the striker 5 approaches the first latch position P1, the cam 46 that has been in contact with the outer circumferential edge of the latch 42 rotates counterclockwise as viewed from the left so as to fall into the latch groove 422 due to the rotation of the latch 42, and abuts against the first cam abutment portion 421d1 of the latch 42, pressing the latch 42 counterclockwise as viewed from the left. Next, the ratchet 45 whose engagement portion 452a has been in contact with the outer circumferential edge of the latch 42 rotates counterclockwise as viewed from the left so as to fall into the first ratchet engagement groove 423 due to the rotation of the latch 42, and the engagement portion 452a engages with the first ratchet engagement groove 423 of the latch 42.

[0081] Then, the latch 42 is held in the first holding position, and holds the striker 5 in the first latch position P1 with the striker 5 engaged with the latch groove 422. As a result, the seat back 3B is held in the first position. At this time, the latch 42 is pressed by the cam 46 in the counterclockwise direction as viewed from the left, so that the latch 42 can be prevented from rattling. Furthermore, the striker 5 is in contact with the first wedge support wall 432a of the wedge 43, and is pressed by the wedge 43 in the counterclockwise direction as viewed from the left. As a result, the striker 5 is pressed by the second latch support wall 422b of the latch groove 422 and held at the first latch position P1, so that rattling at the first latch position P1 can be prevented.

[0082] Furthermore, since the wedge 43 can prevent the striker 5 from rattling at the first latch position P1 with a small amount of movement, the vehicle seat lock device 4A can be made compact.

[0083] In addition, as the compression coil spring 433 is contracted, the wedge 43 urges the first leg 51, which abuts against the first wedge support wall 432a, in a direction pushing the first leg 51 radially outward from the latch groove 422 and the wedge groove 432 due to the biasing force of the compression coil spring 433.

[0084] (Transition from the first holding position to the second holding position) 7, when the latch 42 is in the first holding position, if an occupant or the like operates the operating member 6, the drive lever 61 rotates counterclockwise as viewed from the left. When the drive lever 61 rotates counterclockwise as viewed from the left, the release lever 47, whose engagement pin 47b is engaged with the engagement hole 61a of the drive lever 61, rotates clockwise as viewed from the left. When the release lever 47 rotates clockwise as viewed from the left, the ratchet 45, whose slide pin 47a is inserted into the pin slide hole 451b, and the cam 46, whose slide pin 47a is inserted into the pin slide hole 461b, both rotate clockwise as viewed from the left.

[0085] When the ratchet 45 rotates clockwise as viewed from the left, the engagement portion 452a of the ratchet 45 disengages from the first ratchet engagement groove 423 of the latch 42. When the cam 46 rotates clockwise as viewed from the left, the cam 46 moves away from the first cam abutment portion 421d1 of the latch 42. This releases the latch 42 from the first holding position and allows it to rotate. Therefore, the seat back 3B is allowed to recline from the first position to the second position or to a forwardly folded-down position.

[0086] In this state, when the seat back 3B is reclined from the first position to the second position, the first leg 51 of the striker 5 presses the second latch support wall 422b of the latch groove 422 in a counterclockwise direction when viewed from the left, causing the latch 42 to rotate counterclockwise when viewed from the left, and enters the striker entry groove 41a further forward.

[0087] At this time, the wedge 43 is biased by the biasing force of the compression coil spring 433 in a direction pushing the first leg 51, which abuts against the first wedge support wall 432a, from the latch groove 422 and the wedge groove 432 radially outward from the first pivot shaft. This makes it possible to easily remove the striker 5, which has been held at the first latch position P1 while engaged with the latch groove 422, from the latch groove 422, resulting in excellent operability.

[0088] 8, when the first leg 51 advances further forward into the striker entrance groove 41a, it abuts against the striker holding arm 441 of the link lever 44. Then, the first leg 51 presses the striker holding arm 441 in the clockwise direction as viewed from the left, and advances further forward into the striker entrance groove 41a while rotating the link lever 44 in the counterclockwise direction as viewed from the left against the biasing force of the torsion coil spring 443.

[0089] As shown in Fig. 9, when the first leg 51 further enters the striker entrance groove 41a forward, the link lever 44 rotates clockwise as viewed from the left, and the second leg 443b2 of the torsion coil spring 443 abuts against the slide pin 421b of the latch 42. Then, the torsion coil spring 443 presses the slide pin 421b of the latch 42 in the counterclockwise direction as viewed from the left, causing the latch 42 to elastically rotate in the counterclockwise direction as viewed from the left. When the latch 42 further rotates counterclockwise as viewed from the left, the first leg 51 retreats from the latch groove 422, and when the latch 42 further rotates counterclockwise as viewed from the left, the striker abutment portion 421c of the latch 42 abuts against the first leg 51 (see Fig. 10). Then, the first leg 51 is sandwiched between the striker holding arm 441 of the link lever 44 and the striker abutment portion 421c of the latch 42.

[0090] In this way, the torsion coil spring 443 abuts against the slide pin 421b of the latch 42 and causes the latch 42 to elastically rotate in the counterclockwise direction when viewed from the left, thereby improving the durability of the link lever 44.

[0091] 10, when the first leg 51 enters the striker entrance groove 41a further forward and the latch 42 rotates counterclockwise as viewed from the left to the second holding position, the cam 46 that was in contact with the outer circumferential edge of the latch 42 rotates counterclockwise as viewed from the left due to the rotation of the latch 42 and comes into contact with the second cam abutment portion 421d2 of the latch 42, pressing the latch 42 counterclockwise as viewed from the left. As a result, the latch 42 rotates clockwise to a position beyond the second holding position as viewed from the left. In this way, even when the latch 42 rotates counterclockwise to a position beyond the second retaining position when viewed from the left, as described above, the torsion coil spring 443 abuts against the slide pin 421b of the latch 42, causing the latch 42 to elastically rotate counterclockwise when viewed from the left. This improves the durability of the link lever 44 and, since it is not necessary to provide a large cushion portion on the striker retaining arm 441 of the link lever 44, the front-to-rear dimension of the vehicle seat lock device 4A can be shortened, and the device can be easily attached to a thin seat back 3B.

[0092] At the same time, the ratchet 45, whose engagement portion 452a was abutting against the outer peripheral edge of the latch 42, rotates counterclockwise when viewed from the left so as to fall into the second ratchet engagement groove 424 due to the rotation of the latch 42, and the engagement portion 452a engages with the second ratchet engagement groove 424 of the latch 42.

[0093] (2nd latch position) 11, the latch 42 is then slightly swung back by the balance between the biasing force of the torsion coil spring 425 biasing the latch 42 and the biasing force of the torsion coil spring 443 biasing the link lever 44, and is held in the second holding position. In this state, the cam 46 abuts against the second cam abutment portion 421d2 of the latch 42 and presses the latch 42 forward in the counterclockwise direction as viewed from the left. In this way, the first leg 51 is sandwiched between the striker holding arm 441 of the link lever 44 and the striker abutment portion 421c of the latch 42, and the striker 5 is held in the second latch position P2.

[0094] In this way, by rotating the latch 42 counterclockwise to a position beyond the second retaining position as viewed from the left, and holding the first leg 51 between the striker holding arm 441 of the link lever 44 and the striker abutment portion 421c of the latch 42 with the cam 46 abutting against the second cam abutment portion 421d2 of the latch 42, the striker 5 is held at the second latch position P2, thereby preventing the striker 5 from rattling at the second latch position P2. In addition, since the first leg 51 is held between the striker holding arm 441 of the link lever 44 and the striker abutment portion 421c of the latch 42 to hold the striker 5 at the second latch position P2, the first leg 51 is less likely to get caught when the vehicle seat lock device 4A is operated, and operability is excellent.

[0095] Although not shown, when the latch 42 is in the second holding position, if an occupant or the like operates the operating member 6, the drive lever 61 rotates counterclockwise as viewed from the left. When the drive lever 61 rotates counterclockwise as viewed from the left, the release lever 47, whose engagement pin 47b is engaged with the engagement hole 61a of the drive lever 61, rotates counterclockwise as viewed from the left. When the release lever 47 rotates counterclockwise as viewed from the left, the ratchet 45, whose slide pin 47a is inserted into the pin slide hole 451b, and the cam 46, whose slide pin 47a is inserted into the pin slide hole 461b, both rotate clockwise as viewed from the left.

[0096] When the ratchet 45 rotates clockwise as viewed from the left, the engagement portion 452a of the ratchet 45 disengages from the second ratchet engagement groove 424 of the latch 42. When the cam 46 rotates clockwise as viewed from the left, the cam 46 moves away from the second cam abutment portion 421d2 of the latch 42. This releases the latch 42 from the second holding position and allows it to rotate. Therefore, the seat back 3B can be reclined from the second position to the first position or to a forwardly folded-down position.

[0097] [Modification of the link lever] Here, a modified example of the link lever 44 in the vehicle seat lock device 4A will be described with reference to Fig. 12. In the following description, the same components as those in the above-described link lever 44 are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

[0098] In this modified example, the latch drive arm 442 can come into contact with at least one of the latch 42 and the wedge 43. In this modified example, the latch drive arm 442 can come into contact with the slide pin 421b of the latch 42.

[0099] The latch drive arm 442 has a first arm portion 442a extending radially of the second rotating shaft 412 and capable of abutting the slide pin 421b of the latch 42, a second arm portion 442b extending radially of the second rotating shaft 412 opposite the first arm portion 442a on the circumferential clockwise side of the second rotating shaft 412 when viewed from the inside in the vehicle width direction, i.e., from the left direction, and a slit space portion 442c extending radially of the second rotating shaft 412 between the first arm portion 442a and the second arm portion 442b.

[0100] Then, when the latch 42 transitions from the first latch position to the second latch position, in the embodiment described above, when the first leg 51 advances further forward into the striker entry groove 41a, the link lever 44 rotates clockwise when viewed from the left, and the second leg 443b2 of the torsion coil spring 443 abuts against the slide pin 421b of the latch 42; however, in this modified example, when the first leg 51 advances further forward into the striker entry groove 41a, the link lever 44 rotates clockwise when viewed from the left, and the first arm portion 442a abuts against the slide pin 421b of the latch 42.

[0101] Then, while the first arm portion 442a elastically deforms in the circumferential direction of the second rotating shaft 412 in a direction approaching the second arm portion 442b, it presses the slide pin 421b of the latch 42 in a counterclockwise direction when viewed from the left, causing the latch 42 to elastically rotate in the counterclockwise direction when viewed from the left.

[0102] In this way, the first arm portion 442a elastically deforms while abutting against the slide pin 421b of the latch 42, causing the latch 42 to elastically rotate in the counterclockwise direction when viewed from the left, thereby improving the durability of the link lever 44.

[0103] Furthermore, when the first arm portion 442a elastically deforms by a predetermined amount or more in the circumferential direction of the second rotating shaft 412 in a direction toward the second arm portion 442b, it abuts against the second arm portion 442b, thereby preventing the first arm portion 442a from buckling.

[0104] Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. In addition, the components in the above embodiment may be arbitrarily combined within the scope of the invention.

[0105] For example, in this embodiment, the vehicle seat lock devices 4, 4A are attached to the rear seat 2 and the striker 5 is attached to the vehicle body, but the vehicle seat lock devices 4, 4A may be attached to the vehicle body and the striker 5 may be attached to the rear seat 2.

[0106] This specification describes at least the following items. In parentheses, components corresponding to the above-described embodiment are shown as examples, but the present invention is not limited to these.

[0107] (1) A vehicle seat lock device (vehicle seat lock device 4, 4A) that is attached to one of a vehicle body and a seat back (seat back 3B) and is engageable with a striker (striker 5) that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position (first latch position P1) and the striker can be held at a second latch position (second latch position P2) different from the first latch position, A base plate (base plate 41) provided with a striker entrance groove (striker entrance groove 41a) into which the striker enters and retreats in accordance with the movement of the seat back; A first rotating shaft (first rotating shaft 411) provided on the base plate; a latch (latch 42) supported by the first rotating shaft and rotatable about the first rotating shaft; A wedge (wedge 43) that is supported by the first rotating shaft so as to be slidable in a first direction perpendicular to the axial direction of the first rotating shaft and is rotatable about the first rotating shaft, The latch is A latch body portion (latch body portion 421) and a latch groove (latch groove 422) having a concave shape recessed from an outer circumferential edge of the latch body portion when viewed in the axial direction, into which the striker advances and retreats, When the striker is in a first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; when in a second retaining position, retaining the striker in the second latched position; The wedge is A wedge body portion (wedge body portion 431) and a wedge groove (wedge groove 432) having a concave shape recessed from an outer circumferential edge of the wedge body portion when viewed from the axial direction, into which the striker advances and retreats, The latch and the wedge rotate together, the latch body portion and the wedge body portion are disposed at positions where they at least partially overlap each other when viewed in the axial direction, The latch groove and the wedge groove are formed at positions where they at least partially overlap each other when viewed in the axial direction, the latch groove is a space surrounded by a first latch support wall (first latch support wall 422a) formed by the latch body portion and extending in a radial direction of the first pivot shaft on a retraction side of the striker in the circumferential direction of the first pivot shaft, a second latch support wall (second latch support wall 422b) extending in the radial direction on an engagement side of the striker in the circumferential direction, and a latch bottom wall portion (latch bottom wall portion 422c) connecting an inner end portion of the first latch support wall in the radial direction and an inner end portion of the second latch support wall in the radial direction, The wedge groove is a space surrounded by a first wedge support wall (first wedge support wall 432a) formed by the wedge body portion and extending in the radial direction on a retraction side of the striker in the circumferential direction, a second wedge support wall (second wedge support wall 432b) extending in the radial direction on an engagement side of the striker in the circumferential direction, and a wedge bottom wall portion (wedge bottom wall portion 432c) connecting an inner end portion in the radial direction of the first wedge support wall and an inner end portion in the radial direction of the second wedge support wall, The radially outer end portion (outer end portion 432d) of the first wedge support wall is located at a position overlapping the latch body portion when viewed from the axial direction, The wedge slides in the first direction in association with the advancement and retreat of the striker into the wedge groove, and slides in the first direction such that the first wedge support wall approaches the first latch support wall in the circumferential direction as the striker approaches the first latch position. A seat lock device for a vehicle.

[0108] According to (1), the latch body portion and the wedge body portion are disposed in positions where they at least partially overlap each other when viewed in the axial direction, so that the vehicle seat lock device can be made compact. In addition, since the radial outer end of the first wedge support wall is located at a position overlapping with the latch body portion when viewed from the axial direction of the first pivot shaft, it is possible to prevent the striker from getting caught on the radial outer end of the first wedge support wall when entering the latch groove and the wedge groove. Furthermore, when the striker is engaged with the latch groove and held at the first latch position, the striker is pressed by the wedge to abut against the first wedge support wall, and is therefore pressed against the second latch support wall of the latch groove to be held at the first latch position, preventing rattling at the first latch position. In addition, the wedge can prevent the striker from rattling at the first latch position with a small amount of movement, allowing the vehicle seat lock device to be made smaller. Furthermore, the wedge can bias the striker abutting against the first wedge support wall in a direction pushing it from the latch groove and the wedge groove radially outwardly of the first pivot shaft, making it easier for the striker that has been held in the first latch position while engaged with the latch groove to be removed from the latch groove, providing excellent operability.

[0109] (2) A vehicle seat lock device (vehicle seat lock device 4, 4A) that is attached to one of a vehicle body and a seat back (seat back 3B) and is engageable with a striker (striker 5) that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position (first latch position P1) and the striker can be held at a second latch position (second latch position P2) different from the first latch position, A base plate (base plate 41) provided with a striker entrance groove (striker entrance groove 41a) into which the striker enters and retreats in accordance with the movement of the seat back; A first rotating shaft (first rotating shaft 411) provided on the base plate; a latch (latch 42) supported by the first rotating shaft and rotatable about the first rotating shaft; A second rotation shaft (second rotation shaft 412) provided on the base plate and extending parallel to the first rotation shaft; a link lever (link lever 44) supported by the second rotating shaft and rotatable about the second rotating shaft; a third rotation shaft (3rd rotation shaft 413) provided on the base plate and extending parallel to the first rotation shaft and the second rotation shaft; A ratchet (ratchet 45) and a cam (cam 46) are supported by the third rotating shaft and are rotatable about the third rotating shaft, The latch is A latch body portion (latch body portion 421); a latch groove (latch groove 422) having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, into which the striker advances and retreats; a first ratchet engagement groove (first ratchet engagement groove 423) that has a recessed shape recessed from the outer circumferential edge of the latch body portion when viewed in the axial direction and engages with the ratchet when the latch body portion is in the first holding position; a second ratchet engagement groove (second ratchet engagement groove 424) having a recessed shape recessed from the outer circumferential edge of the latch body portion when viewed in the axial direction and engaging with the ratchet when the latch body portion is in the second holding position; When the striker is in the first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; When in the second retaining position, the striker is retained in the second latched position; The latch body portion is a striker abutment portion (striker abutment portion 421c) that abuts against the striker to hold the striker at the second latch position when the latch is at the second holding position; a cam abutment portion (second cam abutment portion 421d2) with which the cam abuts when the latch rotates in a second direction from the first holding position toward the second holding position, The link lever is a striker holding arm (441) extending in a radial direction of the second pivot shaft, capable of contacting the striker, and configured to hold the striker in the second latch position by clamping the striker together with the striker abutment portion of the latch when the striker is in the second latch position; The ratchet is a latch engaging groove for engaging with the first ratchet engagement groove of the latch to hold the latch at the first retention position, and a latch engaging groove for engaging with the second ratchet engagement groove of the latch to hold the latch at the second retention position; The cam is the latch is abutted against the cam abutment portion of the latch to rotate in the second direction to a position beyond the second holding position, and the latch is pressed in the second direction toward a direction beyond the second holding position, The vehicle seat lock device includes: When the striker abuts against the striker holding arm of the link lever, the link lever rotates about the second rotation shaft, The striker abuts against the striker holding arm, causing the link lever to rotate about the second rotation shaft, thereby rotating the latch in the second direction toward the second holding position, When the latch rotates in the second direction, the cam abuts against the cam abutment portion of the latch to rotate the latch in the second direction to a position beyond the second holding position, and then the latch is pressed in the second direction at the second holding position, The striker is clamped between the striker holding arm of the link lever and the striker abutment portion of the latch to hold the striker at the second latch position. A seat lock device for a vehicle.

[0110] According to (2), by rotating the latch to a position beyond the second retaining position and holding the striker at the second latch position by clamping the striker between the striker retaining arm of the link lever and the striker abutment portion of the latch with the cam abutting the cam abutment portion of the latch, it is possible to prevent the striker from wobbling at the second latch position. Also, because the striker is clamped between the striker retaining arm of the link lever and the striker abutment portion of the latch to hold the striker at the second latch position, the striker is less likely to get caught when the vehicle seat lock device is operated, providing excellent operability.

[0111] (3) The vehicle seat lock device according to (1), The latch body portion is provided with a slide pin (slide pin 421b) that protrudes toward the wedge in the axial direction, The wedge body portion has a long hole shape with the first direction as a longitudinal direction when viewed from the axial direction, and a pin slide hole (pin slide hole 431b) penetrating in the axial direction is formed, The slide pin is inserted through the pin slide hole so as to be slidable in the first direction, When viewed from the axial direction, in a third direction connecting the axis of the first rotating shaft and the center of the slide pin, the latch groove is provided between the axis of the first rotating shaft and the center of the slide pin. A seat lock device for a vehicle.

[0112] According to (3), the slide pin is arranged so that, when viewed from the axial direction, the latch groove is positioned between the axis of the first pivot shaft and the center of the slide pin in the third direction connecting the axis of the first pivot shaft and the center of the slide pin. This makes it possible to slide the wedge in the first direction with precision relative to the latch groove of the latch, and also makes it easy to provide the wedge since the striker does not get in the way when engaging with the latch groove of the latch and the wedge groove of the wedge.

[0113] (4) The vehicle seat lock device according to (2), The link lever includes a latch drive arm (latch drive arm 442) extending in a radial direction of the second rotation shaft and capable of contacting the latch, The latch drive arm is a first arm portion (first arm portion 442a) extending in a radial direction of the second rotation shaft and capable of contacting the latch; a second arm portion (second arm portion 442b) extending in a radial direction of the second rotating shaft and facing the first arm portion in the circumferential direction of the second rotating shaft; A slit space portion (slit space portion 442c) extending in a radial direction of the second rotation shaft between the first arm portion and the second arm portion is provided. A seat lock device for a vehicle.

[0114] According to (4), the first arm portion abuts against the slide pin of the latch while elastically deforming, making it possible to elastically rotate the latch, thereby improving the durability of the link lever.

[0115] (5) The vehicle seat lock device according to (2), A torsion coil spring (torsion coil spring 443) is engaged with the link lever to bias the link lever in a direction opposite to the second direction, The torsion coil spring is A coil portion (coil portion 443a) wound around the second rotating shaft; a first leg portion (first leg portion 443b1) extending from the coil portion radially outward of the second rotating shaft and engaged with the base plate; a second leg portion (second leg portion 443b2) extending from the coil portion to the outside in the radial direction of the second rotating shaft and engaged with the link lever; When the striker abuts against the striker holding arm to cause the link lever to rotate about the second rotation shaft and rotate the latch in the second direction toward the second holding position, the second leg abuts against the latch to elastically rotate the latch in the second direction toward the second holding position. A seat lock device for a vehicle.

[0116] According to (5), the torsion coil spring abuts against the slide pin of the latch to elastically rotate the latch, thereby improving the durability of the link lever.

[0117] (6) A vehicle seat lock device (vehicle seat lock device 4, 4A) that is attached to one of a vehicle body and a seat back (seat back 3B) and can engage with a striker (striker 5) that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position (first latch position P1) and the striker can be held at a second latch position (second latch position P2) different from the first latch position, A base plate (base plate 41) provided with a striker entrance groove (striker entrance groove 41a) into which the striker enters and retreats in accordance with the movement of the seat back; A first rotating shaft (first rotating shaft 411) provided on the base plate; a latch (latch 42) supported by the first rotating shaft and rotatable about the first rotating shaft; a wedge (wedge 43) supported by the first rotating shaft so as to be slidable in a first direction perpendicular to the axial direction of the first rotating shaft and rotatable about the first rotating shaft; A second rotation shaft (second rotation shaft 412) provided on the base plate and extending parallel to the first rotation shaft; a link lever (link lever 44) supported by the second rotating shaft and rotatable about the second rotating shaft; a third rotation shaft (3rd rotation shaft 413) provided on the base plate and extending parallel to the first rotation shaft and the second rotation shaft; A ratchet (ratchet 45) and a cam (cam 46) are supported by the third rotating shaft and are rotatable about the third rotating shaft, The latch is A latch body portion (latch body portion 421); a latch groove (latch groove 422) having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, into which the striker advances and retreats; a first ratchet engagement groove (first ratchet engagement groove 423) that has a recessed shape recessed from the outer circumferential edge of the latch body portion when viewed in the axial direction and engages with the ratchet when the latch body portion is in the first holding position; a second ratchet engagement groove (second ratchet engagement groove 424) having a recessed shape recessed from the outer circumferential edge of the latch body portion when viewed in the axial direction and engaging with the ratchet when the latch body portion is in the second holding position; When the striker is in the first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; When in the second retaining position, the striker is retained in the second latched position; The latch body portion is a striker abutment portion (striker abutment portion 421c) that abuts against the striker to hold the striker at the second latch position when the latch is at the second holding position; a cam abutment portion (second cam abutment portion 421d2) with which the cam abuts when the latch rotates in a second direction from the first holding position toward the second holding position, The wedge is A wedge body portion (wedge body portion 431) and a wedge groove (wedge groove 432) having a concave shape recessed from an outer circumferential edge of the wedge body portion when viewed from the axial direction, into which the striker advances and retreats, The latch and the wedge rotate together, the latch body portion and the wedge body portion are disposed at positions where they at least partially overlap each other when viewed in the axial direction, The latch groove and the wedge groove are formed at positions where they at least partially overlap each other when viewed in the axial direction, the latch groove is a space surrounded by a first latch support wall (first latch support wall 422a) formed by the latch body portion and extending in a radial direction of the first pivot shaft on a retraction side of the striker in the circumferential direction of the first pivot shaft, a second latch support wall (second latch support wall 422b) extending in the radial direction on an engagement side of the striker in the circumferential direction, and a latch bottom wall portion (latch bottom wall portion 422c) connecting an inner end portion of the first latch support wall in the radial direction and an inner end portion of the second latch support wall in the radial direction, The wedge groove is a space surrounded by a first wedge support wall (first wedge support wall 432a) formed by the wedge body portion and extending in the radial direction on a retraction side of the striker in the circumferential direction, a second wedge support wall (second wedge support wall 432b) extending in the radial direction on an engagement side of the striker in the circumferential direction, and a wedge bottom wall portion (wedge bottom wall portion 432c) connecting an inner end portion in the radial direction of the first wedge support wall and an inner end portion in the radial direction of the second wedge support wall, the radially outer end portion of the first wedge support wall is located at a position overlapping the latch body portion as viewed in the axial direction, The radially outer end portion (outer end portion 432d) of the first wedge support wall is located at a position overlapping the latch body portion when viewed from the axial direction, the wedge slides in the first direction as the striker advances and retreats in the wedge groove, and slides in the first direction such that the first wedge support wall approaches the first latch support wall in the circumferential direction as the striker approaches the first latch position; The link lever is a striker holding arm (441) extending in a radial direction of the second pivot shaft, capable of contacting the striker, and configured to hold the striker in the second latch position by clamping the striker together with the striker abutment portion of the latch when the striker is in the second latch position; The ratchet is a latch engaging groove for engaging with the first ratchet engagement groove of the latch to hold the latch at the first retention position, and a latch engaging groove for engaging with the second ratchet engagement groove of the latch to hold the latch at the second retention position; The cam is the latch is abutted against the cam abutment portion of the latch to rotate in the second direction to a position beyond the second holding position, and the latch is pressed in the second direction toward a direction beyond the second holding position, The vehicle seat lock device includes: When the striker abuts against the striker holding arm of the link lever, the link lever rotates about the second rotation shaft, The striker abuts against the striker holding arm, causing the link lever to rotate about the second rotation shaft, thereby rotating the latch in the second direction toward the second holding position, When the latch rotates in the second direction, the cam abuts against the cam abutment portion of the latch to rotate the latch in the second direction to a position beyond the second holding position, and then the latch is pressed in the second direction at the second holding position, The striker is clamped between the striker holding arm of the link lever and the striker abutment portion of the latch to hold the striker at the second latch position. A seat lock device for a vehicle.

[0118] According to (6), the latch body portion and the wedge body portion are disposed in positions where they at least partially overlap each other when viewed in the axial direction, so that the vehicle seat lock device can be made compact. In addition, since the radial outer end of the first wedge support wall is located at a position overlapping with the latch body portion when viewed from the axial direction of the first pivot shaft, it is possible to prevent the striker from getting caught on the radial outer end of the first wedge support wall when entering the latch groove and the wedge groove. Furthermore, when the striker is engaged with the latch groove and held at the first latch position, the striker is pressed by the wedge to abut against the first wedge support wall, and is therefore pressed against the second latch support wall of the latch groove to be held at the first latch position, preventing rattling at the first latch position. In addition, the wedge can prevent the striker from rattling at the first latch position with a small amount of movement, allowing the vehicle seat lock device to be made smaller. Furthermore, the wedge can bias the striker abutting against the first wedge support wall in a direction pushing it from the latch groove and the wedge groove radially outwardly of the first pivot shaft, making it easier for the striker that has been held in the first latch position while engaged with the latch groove to be removed from the latch groove, providing excellent operability. Furthermore, by rotating the latch to a position beyond the second retaining position and holding the striker at the second latched position by clamping the striker between the striker retaining arm of the link lever and the striker abutment portion of the latch with the cam abutting the cam abutment portion of the latch, it is possible to prevent the striker from rattling at the second latched position. Also, because the striker is clamped between the striker retaining arm of the link lever and the striker abutment portion of the latch to hold the striker at the second latched position, the striker is less likely to get caught when the vehicle seat lock device is operated, providing excellent operability.

[0119] (7) A vehicle seat lock device according to (6), The first rotation shaft, the second rotation shaft, and the third rotation shaft are each provided above the striker entrance groove or below the striker entrance groove at a position not overlapping with the striker entrance groove when viewed from the axial direction. A seat lock device for a vehicle.

[0120] According to (7), the front-rear dimension of the vehicle seat lock device can be shortened, so that the device can be easily attached to a thin seat back. [Explanation of symbols]

[0121] 3B Seat back 4, 4A Vehicle seat lock device 41 Base Plate 41a Striker entry groove 411 First rotating shaft 412 Second rotating shaft 413 3rd rotating shaft 42 Latch 421 Latch body part 421b Slide pin 421c Striker contact part 421d2 Second cam contact part (cam contact part) 422 Latch groove 422a First latch support wall 422b Second latch support wall 422c Latch bottom wall 423 First ratchet engagement groove 424 Second ratchet engagement groove 43 Wedge 431 Wedge body part 431b Pin slide hole 432 Wedge groove 432a First wedge support wall 432b Second wedge support wall 432c Wedge bottom wall 432d Outer edge 44 Link lever 441 Striker holding arm 442 Latch drive arm 442a First arm 442b Second Arm 442c Slit space 443 Torsion coil spring 443a Coil section 443b1 1st leg 443b2 2nd leg 45 Ratchet 46 Cam 5 Striker P1 First latch position P2 Second latch position

Claims

1. A vehicle seat lock device that is attached to one of a vehicle body and a seat back and is engageable with a striker that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position, and the striker can be held at a second latch position different from the first latch position, A base plate having a striker entry groove into which the striker enters and retreats in accordance with the movement of the seat back; A first rotation shaft provided on the base plate; a latch supported by the first rotating shaft and rotatable about the first rotating shaft; a wedge that is supported by the first rotation shaft so as to be slidable in a first direction perpendicular to an axial direction of the first rotation shaft and that is rotatable about the first rotation shaft; The latch is a latch body portion; and a latch groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, into which the striker advances and retreats, When the striker is in a first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; When in a second retaining position, the striker is retained in the second latched position; The wedge is A wedge groove having a concave shape recessed from an outer circumferential edge of the wedge body portion as viewed in the axial direction, into which the striker advances and retreats, The latch and the wedge rotate together, the latch body portion and the wedge body portion are disposed at positions where they at least partially overlap each other when viewed in the axial direction, The latch groove and the wedge groove are formed at positions where they at least partially overlap each other when viewed in the axial direction, the latch groove is a space surrounded by a first latch support wall formed by the latch body portion and extending in a radial direction of the first pivot shaft on a retraction side of the striker in the circumferential direction of the first pivot shaft, a second latch support wall extending in the radial direction on an engagement side of the striker in the circumferential direction, and a latch bottom wall portion connecting an inner end portion of the first latch support wall in the radial direction and an inner end portion of the second latch support wall in the radial direction, the wedge groove is a space surrounded by a first wedge support wall formed by the wedge body portion and extending in the radial direction on a retraction side of the striker in the circumferential direction, a second wedge support wall extending in the radial direction on an engagement side of the striker in the circumferential direction, and a wedge bottom wall portion connecting an inner end portion of the first wedge support wall and an inner end portion of the second wedge support wall in the radial direction, the radially outer end of the first wedge support wall is located at a position overlapping the latch body portion when viewed in the axial direction, the wedge slides in the first direction in association with the advancement and retreat of the striker into the wedge groove, and slides in the first direction such that the first wedge support wall approaches the first latch support wall in the circumferential direction as the striker approaches the first latch position. A seat lock device for a vehicle.

2. A vehicle seat lock device that is attached to one of a vehicle body and a seat back and is engageable with a striker that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position, and the striker can be held at a second latch position different from the first latch position, A base plate having a striker entry groove into which the striker enters and retreats in accordance with the movement of the seat back; A first rotation shaft provided on the base plate; a latch supported by the first rotating shaft and rotatable about the first rotating shaft; a second rotation shaft provided on the base plate and extending parallel to the first rotation shaft; a link lever supported by the second rotation shaft and rotatable about the second rotation shaft; a third rotation shaft provided on the base plate and extending parallel to the first rotation shaft and the second rotation shaft; a ratchet and a cam supported by the third rotating shaft and rotatable about the third rotating shaft; The latch is A latch body portion; a latch groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in an axial direction of the first rotation shaft, into which the striker advances and retreats; a first ratchet engagement groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, the first ratchet engagement groove being engaged with the ratchet when the latch body portion is in the first holding position; a second ratchet engagement groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, the second ratchet engagement groove being engaged by the ratchet when the latch body portion is in the second holding position; When the striker is in the first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; When in the second retaining position, the striker is retained in the second latched position; The latch body portion is a striker abutment portion that abuts against the striker to hold the striker at the second latch position when the latch is in the second holding position; a cam abutment portion with which the cam abuts when the latch rotates in a second direction from the first holding position toward the second holding position, The link lever is a striker holding arm extending in a radial direction of the second pivot shaft, capable of coming into contact with the striker, and configured to hold the striker in the second latch position by clamping the striker together with the striker abutment portion of the latch when the striker is in the second latch position, The ratchet is a latch engaging groove for engaging with the first ratchet engagement groove of the latch to hold the latch in the first holding position, and a latch engaging groove for engaging with the second ratchet engagement groove of the latch to hold the latch in the second holding position; The cam is the latch is abutted against the cam abutment portion of the latch to rotate in the second direction to a position beyond the second holding position, and the latch is pressurized in the second direction toward a direction beyond the second holding position, The vehicle seat lock device includes: When the striker abuts against the striker holding arm of the link lever, the link lever rotates about the second rotation shaft, The striker abuts against the striker holding arm, causing the link lever to rotate about the second rotation shaft, thereby rotating the latch in the second direction toward the second holding position, When the latch rotates in the second direction, the cam abuts against the cam abutment portion of the latch to rotate the latch in the second direction to a position beyond the second holding position, and then the latch is pressed in the second direction at the second holding position, the striker is clamped between the striker holding arm of the link lever and the striker abutment portion of the latch to hold the striker at the second latch position. A seat lock device for a vehicle.

3. 2. The vehicle seat lock device according to claim 1, The latch body portion is provided with a slide pin that protrudes toward a side where the wedge is disposed in the axial direction, The wedge body portion has an elongated hole shape with the first direction as viewed in the axial direction, and a pin slide hole is formed through the wedge body portion in the axial direction, The slide pin is inserted through the pin slide hole so as to be slidable in the first direction, When viewed from the axial direction, in a third direction connecting an axis of the first rotating shaft and a center of the slide pin, the latch groove is provided between the axis of the first rotating shaft and the center of the slide pin. A seat lock device for a vehicle.

4. 3. The vehicle seat lock device according to claim 2, the link lever includes a latch drive arm extending in a radial direction of the second rotation shaft and capable of contacting the latch, The latch drive arm is A first arm portion extending in a radial direction of the second rotation shaft and capable of contacting the latch; a second arm portion extending in a radial direction of the second rotating shaft and facing the first arm portion in a circumferential direction of the second rotating shaft; a slit space portion extending in a radial direction of the second rotation shaft between the first arm portion and the second arm portion, A seat lock device for a vehicle.

5. 3. The vehicle seat lock device according to claim 2, a torsion coil spring is engaged with the link lever to bias the link lever in a direction opposite to the second direction, The torsion coil spring is A coil portion wound around the second rotating shaft; A first leg portion extends from the coil portion toward an outer side in a radial direction of the second rotating shaft and is engaged with the base plate; a second leg portion extending from the coil portion toward the outside in the radial direction of the second rotating shaft and engaged with the link lever, When the striker abuts against the striker holding arm to cause the link lever to rotate about the second rotation shaft and rotate the latch in the second direction toward the second holding position, the second leg abuts against the latch to elastically rotate the latch in the second direction toward the second holding position. A seat lock device for a vehicle.

6. A vehicle seat lock device that is attached to one of a vehicle body and a seat back and is engageable with a striker that is attached to the other of the vehicle body and the seat back, The vehicle seat lock device includes: The striker can be held at a first latch position, and the striker can be held at a second latch position different from the first latch position, A base plate having a striker entry groove into which the striker enters and retreats in accordance with the movement of the seat back; A first rotation shaft provided on the base plate; a latch supported by the first rotating shaft and rotatable about the first rotating shaft; a wedge that is supported by the first rotation shaft so as to be slidable in a first direction perpendicular to an axial direction of the first rotation shaft and that is rotatable about the first rotation shaft; a second rotation shaft provided on the base plate and extending parallel to the first rotation shaft; a link lever supported by the second rotation shaft and rotatable about the second rotation shaft; a third rotation shaft provided on the base plate and extending parallel to the first rotation shaft and the second rotation shaft; a ratchet and a cam supported by the third rotating shaft and rotatable about the third rotating shaft; The latch is A latch body portion; a latch groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, into which the striker advances and retreats; a first ratchet engagement groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, the first ratchet engagement groove being engaged with the ratchet when the latch body portion is in the first holding position; a second ratchet engagement groove having a recessed shape recessed from an outer circumferential edge of the latch body portion as viewed in the axial direction, the second ratchet engagement groove being engaged by the ratchet when the latch body portion is in the second holding position; When the striker is in the first retaining position, the striker is retained in the first latch position with the striker engaged with the latch groove; When in the second retaining position, the striker is retained in the second latched position; The latch body portion is a striker abutment portion that abuts against the striker to hold the striker at the second latch position when the latch is in the second holding position; a cam abutment portion with which the cam abuts when the latch rotates in a second direction from the first holding position toward the second holding position, The wedge is A wedge groove having a concave shape recessed from an outer circumferential edge of the wedge body portion as viewed in the axial direction, into which the striker advances and retreats, The latch and the wedge rotate together, the latch body portion and the wedge body portion are disposed at positions where they at least partially overlap each other when viewed in the axial direction, The latch groove and the wedge groove are formed at positions where they at least partially overlap each other when viewed in the axial direction, the latch groove is a space surrounded by a first latch support wall formed by the latch body portion and extending in a radial direction of the first pivot shaft on a retraction side of the striker in the circumferential direction of the first pivot shaft, a second latch support wall extending in the radial direction on an engagement side of the striker in the circumferential direction, and a latch bottom wall portion connecting an inner end portion of the first latch support wall in the radial direction and an inner end portion of the second latch support wall in the radial direction, the wedge groove is a space surrounded by a first wedge support wall formed by the wedge body portion and extending in the radial direction on a retraction side of the striker in the circumferential direction, a second wedge support wall extending in the radial direction on an engagement side of the striker in the circumferential direction, and a wedge bottom wall portion connecting an inner end portion of the first wedge support wall and an inner end portion of the second wedge support wall in the radial direction, the radially outer end of the first wedge support wall is located at a position overlapping the latch body portion when viewed in the axial direction, the wedge slides in the first direction in association with the advancement and retreat of the striker into the wedge groove, and slides in the first direction such that the first wedge support wall approaches the first latch support wall in the circumferential direction as the striker approaches the first latch position, The link lever is a striker holding arm extending in a radial direction of the second pivot shaft, capable of coming into contact with the striker, and configured to hold the striker in the second latch position by clamping the striker together with the striker abutment portion of the latch when the striker is in the second latch position, The ratchet is a latch engaging groove for engaging with the first ratchet engagement groove of the latch to hold the latch in the first holding position, and a latch engaging groove for engaging with the second ratchet engagement groove of the latch to hold the latch in the second holding position; The cam is the latch is abutted against the cam abutment portion of the latch to rotate in the second direction to a position beyond the second holding position, and the latch is pressurized in the second direction toward a direction beyond the second holding position, The vehicle seat lock device includes: When the striker abuts against the striker holding arm of the link lever, the link lever rotates about the second rotation shaft, The striker abuts against the striker holding arm, causing the link lever to rotate about the second rotation shaft, thereby rotating the latch in the second direction toward the second holding position, When the latch rotates in the second direction, the cam abuts against the cam abutment portion of the latch to rotate the latch in the second direction to a position beyond the second holding position, and then the latch is pressed in the second direction at the second holding position, the striker is clamped between the striker holding arm of the link lever and the striker abutment portion of the latch to hold the striker at the second latch position. A seat lock device for a vehicle.

7. 7. The vehicle seat lock device according to claim 6, The first rotation shaft, the second rotation shaft, and the third rotation shaft are each provided above the striker entrance groove or below the striker entrance groove at a position not overlapping with the striker entrance groove when viewed from the axial direction. A seat lock device for a vehicle.

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