JP2018144681A - Lock device for vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock device for a vehicular seat which is configured to suppress increase in operation force for releasing a locked state of the lock device even if enhancing energization force in a turning direction by which a pole engages with a hook.SOLUTION: The lock device for a vehicular seat comprises a striker 8 fixed to a floor and a lock mechanism 10 mounted on the vehicular seat. The lock mechanism 10 comprises a base plate 11, a hook 12, a pole 13, a releasing lever 16 and a coil spring 16S. When a line connecting contact points TP1 to a releasing lever shaft center 17C is defined as A, a line connecting contact points TP2 to the releasing lever shaft center 17C is defined as B, and lines in which A and B are projected in parallel to an energizing direction X with respect to a line which is perpendicular to the energizing direction X and passes through the releasing lever shaft center 17C are defined as AP and BP respectively, a pole pin hole 16c is formed so that a value of AP/BP becomes smaller than 1.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vehicle seat locking device.

  Conventionally, as a locking device for locking a vehicle seat, for example, an automobile seat, to a striker installed on a floor, one disclosed in Patent Document 1 below is known. This locking device includes a base plate, a plate-like hook, a plate-like pole, and a release lever integrated with the pole. The base plate includes a recess that is fixed to the automobile seat and that can receive the striker. The hook is pushed and rotated by an operation in which the striker is received in the recess of the base plate, and a part of the hook is engaged with the back of the striker to close the recess. When the hook is in a state where the recess is closed, the pole is engaged with the hook by the rotation received by the urging force of the tension coil spring hung between the release lever and the hook and stops the rotation of the hook. Put it in a state.

JP 2009-52223 A

  In the vehicle seat locking device described above, the hook is pivotally biased in a direction to engage the striker by the biasing force of the tension coil spring hung between the release lever and the hook, and the pole is engaged with the hook. It is urged to rotate in the direction of joining. Then, when the release lever is rotated to release the lock state of the lock device, the pole is rotated in the unlocked direction in which the engagement with the hook is released in conjunction with the release lever. At this time, in order to unlock the pole, it is necessary to overcome the biasing force of the spring and rotate the release lever. Therefore, in order to prevent the pole from being rotated in a direction in which the hook is disengaged from the hook due to an inertial force caused by an impact force applied at the time of an automobile collision or the like, the spring is locked when the urging force of the spring is increased. There has been a problem that the operating force for releasing the lock state of the apparatus also increases.

  In view of such a demand, an object of the present invention is to provide a vehicle that suppresses an increase in operating force for releasing the lock state of the lock device even if the biasing force in the rotational direction in which the pole engages with the hook is increased. It is providing the locking device for seats.

  A first invention of the present invention is a vehicle seat locking device, comprising a striker provided on one of two members locked to each other, and a lock mechanism provided on the other, the lock mechanism comprising: A base plate having a recess capable of receiving the striker, and a pivot shaft pivotally supported by a hook shaft perpendicular to the base plate so that the striker is pushed by a movement to enter the recess and rotates with the recess. The hook is in a locked state with the striker sandwiched therebetween, and is pivotally biased in an unlocking direction, and is pivotally supported by a pole shaft perpendicular to the base plate so as to be engaged with the hook. A pole that holds the hook in the locked state and a release lever shaft that is perpendicular to the base plate, and is pivotally supported by the pivot. A release lever that slidably engages and pivots the pole, and one end portion is attached to the release lever and the other end portion is attached to the base plate, and the one end portion is disposed with respect to the other end portion. An urging spring that urges the lever in the tension direction, and the pole has a protrusion erected in parallel with the pole shaft at a position spaced radially from the pole shaft, and the release lever Is a plate-like member that is provided at a position radially spaced from the release lever shaft, and a spring mounting portion for mounting the one end portion of the biasing spring, and a curve extending so as to surround the spring mounting portion. And an elongated hole in which the protrusion is slidably engaged, and the elongated hole is in a direction in which the pawl is engaged with the hook by the rotation of the urging spring of the urging spring of the release lever. Configured to rotate A straight line connecting the point where the projection abuts the release lever and the axis of the release lever shaft in a state where the pole is engaged with the hook is A, and the spring mounting portion and the release lever shaft A straight line connecting the shaft centers of the biasing springs is defined as B, and A and B are biased with respect to a line passing through the shaft center of the release lever shaft and perpendicular to the biasing direction which is the direction of the tension biasing force of the biasing spring. When the lines projected in the direction are AP and BP, respectively, the AP / BP value is formed to be smaller than 1.

  According to the first aspect of the present invention, the long hole is rotated in the direction in which the pawl is engaged with the hook by the urging force of the urging spring of the release lever by the slidable engagement with the protrusion. Is formed. The long hole is defined as A, which is a straight line connecting the point where the protrusion abuts the release lever and the axis of the release lever shaft when the pole is engaged with the hook, and the axis of the spring mounting portion and the release lever shaft. Where B is a straight line connecting A and B, and A and B are projected in a biasing direction with respect to a line perpendicular to the biasing direction and passing through the axis of the release lever shaft, respectively, and AP and BP, respectively. The value of / BP is formed to be smaller than 1. As a result, in the state where the pole is engaged with the hook, the projection of the pole can be pressed with a force larger than the tension force of the biasing spring. The size can be reduced compared to the case of mounting on the pole protrusion.

  According to a second aspect of the present invention, in the first aspect, the release lever includes a traction portion provided at a position radially separated from the release lever shaft from the spring mounting portion, and the elongated hole includes the The release lever is pulled by the pulling portion and rotated against the urging force of the urging spring, thereby rotating the pole to release the engagement with the hook, and the hook is moved to the striker. Is formed so that the hook is shifted from the locked state to the state where the engagement with the striker is released.

  According to the second aspect of the present invention, since the pulling portion of the release lever is located in a radial direction away from the axis of the release lever shaft from the spring mounting portion, the release lever is pulled against the pulling force of the biasing spring. It is possible to reduce the force for pulling and turning with the, and to suppress an increase in operating force.

It is a side view of the use condition of the car seat to which the locking device of one embodiment of the present invention was attached. It is a side view of the storage state of the vehicle seat to which the locking device of the embodiment is attached. It is a disassembled perspective view of the locking mechanism of the said embodiment. It is a perspective view of the state which assembled the lock mechanism of FIG. The base plate on the front side is omitted. Indicates lock status. It is a figure explaining the operating condition of the lock mechanism of the said embodiment. Indicates lock status. It is a figure explaining the operating condition of the lock mechanism of the said embodiment. The transition process to an unlocked state is shown. It is a figure explaining the operating condition of the lock mechanism of the said embodiment. Indicates unlocked state. It is a figure explaining the operating condition of the lock mechanism of the said embodiment. The situation where the release lever is further rotated from the unlocked state is shown. It is IX-IX arrow directional cross-sectional view of FIG. FIG. 6 is a cross-sectional view taken along line XX in FIG. 5.

  1 to 10 show an embodiment of the present invention. This embodiment is an example in which the present invention is applied to an automobile seat 1. In each figure, each direction of the automobile and the automobile seat 1 when the automobile seat 1 is attached to the floor FL of the automobile is shown by arrows. In the following description, the description regarding the direction is made based on this direction. Here, the automobile seat 1 corresponds to the “vehicle seat” in the claims. Further, the floor FL and the automobile seat 1 correspond to “one of the two members” and “the other of the two members” in the claims, respectively.

  1 and 2 are side views of an automobile seat 1 to which a vehicle seat locking device (hereinafter referred to as “locking device”) according to an embodiment of the present invention is applied. FIG. 1 shows the vehicle seat 1 in a use state in which an occupant is seated, and FIG. The vehicle seat 1 includes a seat cushion 2 and a seat back 3 attached to the rear end portion side of the seat cushion 2 so as to be rotatable about an axis extending in the left-right direction (front and back direction of the paper surface). The front end portion side of the cushion frame 4 in the seat cushion 2 is rotatably attached to a bracket 5 fixed to the floor FL by a turning shaft 6 extending in the left-right direction. The locking device 7 is disposed between the lower part on the rear end side of the cushion frame 4 and the floor FL so that the vehicle seat 1 can be locked and unlocked with respect to the floor FL. The lock device 7 is roughly divided into a lock mechanism 10 attached to the lower portion of the cushion frame 4 on the rear end side and a striker 8 fixed to the floor FL. In addition, the connection part by the rotating shaft 6 and the locking device 7 are disposed on the left and right sides of the vehicle seat 1. Here, the locking device 7 corresponds to the “vehicle seat locking device” in the claims.

  As shown in FIG. 1, the lock device 7 is in a locked state when the seat back 3 is in the upright position with respect to the seat cushion 2. Then, when the seat back 3 is brought into the folded position where the seat back 3 is folded down with respect to the seat cushion 2, the lock device 7 is unlocked. A state in which the vehicle seat 1 is flipped forward with respect to the floor FL in a state where the seat back 3 is in the folded position with respect to the seat cushion 2 is a retracted state shown in FIG. When the automobile seat 1 in the retracted state is returned to the upright position with respect to the seat cushion 2 and lowered downward, the lock device 7 returns to the locked state. Details of the operation of the locking device 7 in the operation of the seat cushion 2 and the seat back 3 will be described later.

  As shown in FIGS. 3 to 5, the lock mechanism 10 includes a base plate 11, a hook 12 attached to the base plate 11, a pole 13, a cam 14, a biasing plate 15, and a release lever 16. .

  As shown in FIGS. 3 and 4, the base plate 11 is formed by assembling the left base plate 11L and the right base plate 11R with a space therebetween. The left base plate 11L includes an upper left base plate 11La and a lower left base plate 11Lb, and the right base plate 11R includes an upper right base plate 11Ra and a lower right base plate 11Rb. The upper left base plate 11La is a flat plate-like member, and is provided with an attachment hole 11La11 in the upper part, a hook shaft hole 11La12 in the lower rear part, and a pole shaft hole 11La13 in the lower front part. Further, between the mounting hole 11La11 and the pole shaft hole 11La13, an elliptical pole pin hole 11La14 curved forward and a release lever shaft hole 11La15 are provided above the pole pin hole 11La14. The lower left base plate 11Lb is a planar plate-like member having a recess 11Lb1 that opens downward and forward on the lower side. A hook shaft hole 11Lb2 is provided in the upper rear portion, and a pole shaft hole 11Lb3 is provided in the upper front portion. ing. A resin member 11Lb4 is attached to the outer peripheral edge of the recess 11Lb1 to soften the strike of the lower left base plate 11Lb against the striker 8 and prevent the generation of abnormal noise. When the upper left base plate 11La and the lower left base plate 11Lb are overlapped at a predetermined position, the hook shaft hole 11La12 and the hook shaft hole 11Lb2 are aligned, and the pole shaft hole 11La13 and the pole shaft hole 11Lb3 are aligned. Is formed.

  As shown in FIGS. 3 and 4, the upper right base plate 11Ra includes a planar main body 11Ra1 and a standing wall 11Ra2 extending toward the left in the outer peripheral portion excluding the lower side of the main body 11Ra1. . An attachment hole 11Ra11 is provided in the upper part of the main body 11Ra1, a hook shaft hole 11Ra12 is provided in the rear lower part, and a pole shaft hole 11Ra13 is provided in the lower front part. The lower right base plate 11Rb is a planar plate-like member having a recess 11Rb1 that opens downward and forward on the lower side. A hook shaft hole 11Rb2 is provided in the upper rear portion, and a pole shaft hole 11Rb3 is provided in the upper front portion. ing. A resin member 11Rb4 is attached to the outer peripheral edge of the recess 11Rb1 to soften the strike of the lower right base plate 11Rb against the striker 8 and prevent the generation of abnormal noise. When the upper right base plate 11Ra and the lower right base plate 11Rb are overlapped at a predetermined position, the hook shaft hole 11Ra12 and the hook shaft hole 11Rb2 are aligned, and the pole shaft hole 11Ra13 and the pole shaft hole 11Rb3 are aligned. Is formed. The upper left base plate 11La and the lower left base plate 11Lb overlapped at a predetermined position are, with respect to the upper right base plate 11Ra and the lower right base plate 11Rb overlapped at a predetermined position, a hook shaft pin 12P and a pole shaft pin 13P, which will be described later. Are connected by Thereby, the upper left base plate 11La and the lower left base plate 11Lb are assembled to the left end portion of the standing wall portion 11Ra2 while maintaining a space with respect to the upper right base plate 11Ra and the lower right base plate 11Rb. The hook shaft pin 12P and the pole shaft pin 13P are attached perpendicularly to the left base plate 11L and the right base plate 11R. A hook 12 and a pole 13 are disposed in a space between the left base plate 11L and the right base plate 11R, as will be described later. A round pipe-shaped spacer 18 is disposed between the peripheral edge of the attachment hole 11La11 of the upper left base plate 11La and the peripheral edge of the attachment hole 11Ra11 of the upper right base plate 11Ra. Then, the striker 8 is received by a bolt (not shown) passed through the inner cylinder portion of the spacer 18 with the recesses 11Lb1 and the recesses 11Rb1 facing forward and downward in the lower part on the rear end side of the cushion frame 4 shown in FIG. Is installed in a state where it is possible. On the upper end portion side of the standing wall portion 11Ra2, a spring locking hole 11Ra21 in which one end portion of a coil spring 15S described later is locked is provided.

  As shown in FIG. 3 to FIG. 5 and FIG. 9, the hook 12 has a hook shaft with respect to the base plate 11 by a hook shaft pin 12 </ b> P passed through a shaft pin hole 12 </ b> H provided in a substantially central portion with a plate-like member. It is attached so that it can rotate around the pin 12P. Specifically, as shown in FIG. 9, the left end portion of the hook shaft pin 12P that rotatably supports the hook 12 is passed through the hook shaft hole 11La12 and the hook shaft hole 11Lb2 of the left base plate 11L, and is fixed by caulking. Yes. The right end portion of the hook shaft pin 12P that rotatably supports the hook 12 is passed through the hook shaft hole 11Ra12 and the hook shaft hole 11Rb2 of the right base plate 11R and fixed by caulking. The hook 12 includes a hook portion 12a that opens rearward and upward in a side view. From the hook portion 12a to the peripheral portion of the shaft pin hole 12H, it is formed as a thick portion 12b having a large thickness, and the side facing the pole 13 other than the thick portion 12b and spaced from the shaft pin hole 12H has a thick portion. It is formed as a thin portion 12c that is about 1/2 of 12b. The thick part 12b and the thin part 12c are formed in steps. In the thin portion 12c, an upper end protrusion 12c1 protruding in a direction away from the shaft pin hole 12H is formed at the upper end of the hook portion 12a on the opening side. Further, the thin portion 12c is provided with a protrusion 12c2 protruding above the hook portion 12a in a direction away from the shaft pin hole 12H, and a surface facing the lower pole 13 of the protrusion 12c2 is the first locking surface portion 12c3. It is formed as. In addition, an arc-shaped second locking surface portion 12c4 centering on the axis of the shaft pin hole 12H is formed adjacent to the lower side of the first locking surface portion 12c3. That is, as viewed from the side, a first end surface portion 12c6 is formed at the outer peripheral end of the thin portion 12c, and a first locking surface portion 12c3 and a second locking surface portion 12c4 are formed in the first end surface portion 12c6. . In the thick portion 12b, the end of the thick portion 12b on the side facing the pole 13 is formed as a second end surface portion 12b1 that rises vertically from the right side surface of the thin portion 12c to the right in a side view. . The second end surface portion 12b1 includes a bulging portion 12b11 that bulges in the direction of the protruding portion 12c2 in a side view, and a front surface of the bulging portion 12b11 is formed as a cam contact surface portion 12b12. That is, the cam contact surface portion 12b12 is formed in the second end surface portion 12b1. Further, the hook 12 is an annular hook that urges the hook 12 to rotate with respect to the left base plate 11L around the hook shaft pin 12P in the clockwise direction in FIG. 5 (in the direction of releasing the engagement with the striker 8). A hook spring locking portion (not shown) for locking one end of the spring 12S is provided. The hook spring 12S has a hook shaft pin 12P disposed in the ring, and one end of the hook spring 12S is locked to the locking portion of the hook 12, and the other end is a hook spring locking portion (see FIG. (Not shown). By the rotation of the hook 12, the hook portion 12a can be engaged with or released from the striker 8 received in the recess 11Lb1 and the recess 11Rb1 of the base plate 11. As shown in FIG. 5, when the hook portion 12a is engaged with the striker 8, the striker 8 is sandwiched between the hook portion 12a and the recess 11Lb1 and the recess 11Rb1 to be in a locked state. 3 to 8, a hatched portion is provided with a resin layer 12d coated with a resin. This is for the purpose of preventing abnormal noise when contacting the striker 8 or the pole 13. Here, the hook shaft pin 12P corresponds to a “hook shaft” in the claims.

  As shown in FIGS. 3 to 5 and 9, the pole 13 is a plate-like member having a thickness similar to that of the thin portion 12 c of the hook 12, and a shaft pin hole 13 </ b> H is provided at a substantially central portion. The pole 13 is attached to the base plate 11 so as to be rotatable around the pole shaft pin 13P by a pole shaft pin 13P passed through the shaft pin hole 13H. Specifically, as shown in FIG. 9, the left end portion of the pole shaft pin 13P that rotatably supports the pole 13 is formed in the pole shaft hole 11La13 of the left upper base plate 11La and the pole shaft hole 11Lb3 of the left lower base plate 11Lb. Threaded and fixed. A washer 19 is disposed between the pole 13 and the lower left base plate 11Lb. The washer 19 is for the pole 13 to be disposed at the same position in the direction of the pole shaft pin 13P with respect to the thin portion 12c of the hook 12. Further, the right end portion of the pole shaft pin 13P that rotatably supports the pole 13 is passed through and fixed to the pole shaft hole 11Ra13 of the upper right base plate 11Ra and the pole shaft hole 11Rb3 of the lower right base plate 11Rb. The pole 13 includes a locking end portion 13 a on the side facing the hook 12. The locking end portion 13a is positioned so as to be engageable with the first locking surface portion 12c3 of the hook 12 engaged with the striker 8 and brought into a locked state. A first arm portion 13b extending in the radial direction is provided on the opposite side to the locking end portion 13a with the shaft pin hole 13H interposed therebetween, and a cam contact pin 13e is provided on the first arm portion 13b with respect to the pole 13. It is vertically fixed and extends in the right direction (the direction of the right base plate 11R). The cam contact pin 13e is disposed in a state where the right end portion side thereof does not contact the right base plate 11R. A second arm portion 13c extending in the radial direction from the shaft pin hole 13H is provided substantially vertically upward with respect to the locking end portion 13a and the first arm portion 13b. A pin hole 13c1 penetrating in the plate thickness direction for fixing the pole pin 13f is provided on the distal end side in the radial direction of the second arm portion 13c, and the pole pin 13f is perpendicular to the pole 13 in the left direction in the pin hole 13c1. It extends and is fixed (in the direction of the left base plate 11L). As will be described later, the pole pin 13f passes through the pole pin hole 11La14 of the upper left base plate 11La so as to protrude leftward from the left surface of the upper left base plate 11La. A portion of the pole pin 13f that protrudes to the left from the left surface of the upper left base plate 11La is passed through the pole pin hole 16c of the release lever 16 and is slidable. Thereby, the pole 13 is urged to rotate counterclockwise around the pole shaft pin 13P in FIG. 5 by the urging force applied to the pole pin 13f from the release lever 16 through the pole pin hole 16c. A hook sliding surface portion 13g extending in the direction of the pole shaft pin 13P from the lower end portion of the locking end portion 13a of the pole 13 is formed. Here, the pole shaft pin 13P and the pole pin 13f correspond to a “pole shaft” and a “projection” in the claims, respectively.

  As shown in FIGS. 3 to 5 and 9, the cam 14 is a plate-like member that is attached between the pole 13 and the right base plate 11 </ b> R so as to be rotatable around the pole shaft pin 13 </ b> P. The cam 14 and the pole 13 can be individually rotated around the pole shaft pin 13P. The cam 14 includes a disc-shaped base portion 14a having a cam shaft hole 14H provided in the center in a side view, and a cam portion connected to the base portion 14a by a pair of connecting portions 14c extending in the radial direction from the cam shaft hole 14H. 14b. In a portion surrounded by the base portion 14a, the pair of connecting portions 14c, and the cam portion 14b, a curved long hole-shaped reduction hole 14d penetrating in the plate thickness direction is formed. The thickness of the cam 14 is approximately the same as that of the second end surface portion 12 b 1 of the hook 12. Three arc-shaped protrusions 14a1 projecting leftward (in the direction of the pole 13) are provided at equal intervals on the outer peripheral end of the base part 14a. The protruding portion 14a1 is for the left end, which is the tip thereof, to come into contact with the pole 13 so that the pole 13 and the cam 14 can be relatively rotated around the pole shaft pin 13P. Further, a pole abutting portion 14a2 that protrudes downward in the radial direction from the cam shaft hole 14H in FIG. 5 is provided at the outer peripheral end of the base portion 14a. The pole contact portion 14 a 2 is formed so as to be able to contact the cam contact pin 13 e of the pole 13. The lower side of the end surface of the cam portion 14b opposite to the reduction hole 14d is formed as a substantially arc-shaped hook contact surface 14b1 centering on the center of the cam shaft hole 14H. Specifically, the hook contact surface 14b1 gradually pushes the cam contact surface portion 12b12 of the hook 12 toward the far side as the counterclockwise rotation in FIG. 5 centering on the pole shaft pin 13P of the cam 14 is performed. It is a curved surface shape having a driving angle. On the upper side of the end surface of the cam portion 14b opposite to the light reducing hole 14d, a substantially arc-shaped projection portion 14b2 protruding in the left direction (the direction of the pole 13) is provided. The protrusion 14b2 is also for the left end, which is the tip, abutting against the pole 13 so that the pole 13 and the cam 14 can be relatively rotated around the pole shaft pin 13P. On the lower end side of the cam portion 14b, an urging plate abutting pin 14e is fixed to the cam 14 so as to extend in the right direction (the direction of the right base plate 11R). The urging plate abutting pin 14e of the cam 14 is arranged in a state where the right end side thereof does not abut on the right base plate 11R. As a result, the cam 14 is returned to the hook 12 by the pole 13 and the rotation thereof is regulated as the rotation of the biasing plate contact pin 14e is received by the biasing force of the biasing plate 15 described later. From this position, it is pushed around in the direction of further rotation. Then, the gap between the hook portion 12a of the hook 12 and the concave portion 11Lb1 and the concave portion 11Rb1 of the base plate 11 is filled, and the striker 8 is held so as not to rattle.

  As shown in FIGS. 3 to 5 and 9, the urging plate 15 is a plate-like member having the same thickness as the cam 14, and rotates around the hook shaft pin 12 </ b> P between the hook 12 and the right base plate 11 </ b> R. Installed as possible. The urging plate 15 and the hook 12 can be individually rotated around the hook shaft pin 12P. The urging plate 15 is provided with a urging plate shaft hole 15H at the center portion in a side view, a cam abutting arm portion 15b is provided on the front side facing the cam 14, and the urging plate shaft of the cam abutting arm portion 15b. On the opposite side across the hole 15H, a spring locking arm portion 15c is provided. A coil spring 15S is hung between the spring locking arm portion 15c and the spring locking hole 11Ra21 of the upper right base plate 11Ra so that the biasing plate 15 is centered around the hook shaft pin 12P with respect to the left base plate 11L. Is urged to rotate clockwise. A smoothly curved cam contact surface portion 15b1 is provided on the lower side of the cam contact arm portion 15b, and the cam contact surface portion 15b1 contacts the urging plate contact pin 14e of the cam 14 and presses the cam. 14 is rotated counterclockwise around the pole shaft pin 13P in FIG.

  As shown in FIGS. 3 to 5 and 10, the release lever 16 is a plate-like member having a thickness similar to that of the cam 14, and the front is an arc in a side view (viewed from the direction in which the pole shaft pin 13 </ b> P extends). It has a substantially semicircular shape. On the upper end side of the release lever 16, the release lever 16 extends around the release lever shaft pin 17 through the release lever shaft pin 17 extending to the left perpendicular to the upper left base plate 11 La and disposed in the release lever shaft hole 11 La 15. Is provided with a shaft pin hole 16a. Further, on the lower end side of the release lever 16, a cable connection hole 16b which is a long hole for connecting the operation cable 20 for rotating the release lever 16 around the release lever shaft pin 17 from the front side is provided. Yes. An intermediate portion between the shaft pin hole 16a and the cable connection hole 16b is engaged with one end of a coil spring 16S for urging the release lever 16 around the release lever shaft pin 17 clockwise in FIG. A spring locking hole 16d is provided. Further, the release lever 16 is provided with a pole pin hole 16c that is a long hole that is curved and extends along the outer peripheral edge portion with the spring locking hole 16d as an inner side. The pole pin hole 16c is formed so that the pole pin 13f can slide therein. The other end of the coil spring 16S is locked to a spring locking portion 11La22 (see FIG. 5) provided on the upper left base plate 11La. Here, the coil spring 16S and the pole pin hole 16c correspond to a “biasing spring” and a “long hole” in the claims, respectively. Further, the release lever shaft pin 17 and the cable connection hole 16b correspond to a “release lever shaft” and a “traction portion” in the claims, respectively. Furthermore, the spring locking hole 16d and the spring locking portion 11La22 correspond to “one end” and “the other end” in the claims, respectively.

  The operation of the locking device 7 will be described with reference to FIGS. FIG. 5 shows a locked state of the locking device 7 when the automobile seat 1 is in a use state (FIG. 1) in which an occupant can be seated. The hook portion 12a of the hook 12 holds the striker 8 between the recess 11Lb1 and the recess 11Rb1 of the base plate 11. The pole 13 is urged to rotate counterclockwise in FIG. 5 around the pole shaft pin 13P by the rotation urging force applied from the release lever 16 via the pole pin 13f, and the rear end of the locking end 13a. The lower end portion is in contact with the second locking surface portion 12c4 of the hook 12, and the rotation is stopped. At this time, the pole pin 13f is located on the upper end side of the pole pin hole 16c. Further, the locking end portion 13 a of the pole 13 is in a state where a gap is formed so as to face the first locking surface portion 12 c 3 of the hook 12. The cam 14 has a rotation applied from the urging plate 15 as the pressing force by the cam contact pin 13e is reduced by the counterclockwise rotation of the pole 13 about the pole shaft pin 13P in FIG. The force is urged to rotate counterclockwise in FIG. The cam 14 presses the hook contact surface 14b1 against the cam contact surface portion 12b12 of the hook 12 and gradually pushes the cam contact surface portion 12b12 of the hook 12 to the far side, so the hook 12 is centered on the hook shaft pin 12P. In FIG. 5, it rotates counterclockwise. Thus, the gap between the hook portion 12a and the recess 11Lb1 and the recess 11Rb1 of the base plate 11 is filled. When the normal vehicle seat 1 is used, it is held against the floor FL without backlash, and when the cam 14 is deformed due to excessive force input due to a rear impact or the like, the locking end portion of the pole 13 is retained. 13a engages with the first locking surface portion 12c3 of the hook 12 and strongly holds it against the floor FL.

  In the locked state of the locking device 7 shown in FIG. 5, the axis of the release lever shaft pin 17 is the release lever shaft center 17C, and the contact point between the pole pin 13f of the pole 13 and the peripheral portion of the pole pin hole 16c of the release lever 16 is the contact point. A contact point between one end of TP1 and the coil spring 16S and the peripheral edge of the spring locking hole 16d of the release lever 16 is defined as a contact point TP2. A line connecting the contact point TP1 and the release lever shaft center 17C is a line segment A, a line connecting the contact point TP2 and the release lever shaft center 17C is a line segment B, and the coil spring 16S defines the spring locking hole 16d. The direction of the tensile force applied to the peripheral edge portion is defined as an urging direction X. Further, a line A that is projected in parallel to the biasing direction X with respect to a straight line that passes through the release lever axis 17C perpendicular to the biasing direction X is a line segment AP, and the release lever axis 17C that is perpendicular to the biasing direction X A line segment BP is a line obtained by projecting the line segment B in parallel with the energizing direction X with respect to a straight line passing through. Further, a force applied by the coil spring 16S in the biasing direction X is defined as a tensile force F. The force with which the release lever 16 presses the pole pin 13f at the contact point TP1 is F × BP / AP. Here, since AP is set smaller than BP, BP / AP is larger than 1. Since the pole pin 13f can be pressed with a force larger than the tensile force F of the coil spring 16S, the coil spring 16S is directly attached to the pole pin 13f of the pole 13 in order to obtain the necessary rotation torque of the pole 13. The coil spring 16S can be reduced in size. Here, the contact point TP1, the contact point TP2, and the urging direction X correspond to “the point where the protruding portion comes into contact with the release lever”, “spring mounting portion”, and “urging direction” in the claims, respectively. .

  When the seat back 3 is tilted from the standing position toward the folding position overlapped with the seat cushion 2 from the state of the locking device 7 shown in FIG. 5, the release lever 16 is inserted into the cable connection hole 16b at one end. Is pulled forward by the operation cable 20 locked. Accordingly, the release lever 16 is rotated counterclockwise in FIG. 6 against the biasing force of the coil spring 16S around the release lever shaft pin 17. Accordingly, the pole pin 13f of the pole 13 slides downward in the pole pin hole 16c of the release lever 16 so that the pole 13 rotates clockwise around the pole shaft pin 13P in FIG. . At this time, the cam 14 rotates clockwise in FIG. 6 against the rotation urging force by the urging plate 15 because the pole abutting portion 14a2 is pressed by the cam abutting pin 13e of the pole 13. . As a result, the force of pressing the hook contact surface 14b1 against the cam contact surface portion 12b12 of the hook 12 and gradually pushing away to the far side is reduced, and the distance between the hook portion 12a and the recesses 11Lb1 and 11Rb1 of the base plate 11 is reduced. The state where the gap is filled is released. The rear lower end portion of the locking end portion 13a of the pole 13 is separated from the second locking surface portion 12c4 of the hook 12, but the locking end portion 13a of the pole 13 is opposed to the first locking surface portion 12c3 of the hook 12. It is in.

  Next, as shown in FIG. 7, when the seat back 3 is lowered from the upright position to the folded position overlaid on the seat cushion 2, one end of the release lever 16 is locked to the cable connection hole 16b. The operation cable 20 is further pulled forward. Then, the release lever 16 rotates counterclockwise in FIG. 7 against the urging force of the coil spring 16 </ b> S around the release lever shaft pin 17. At this time, since the pole pin 13f of the pole 13 is slidably engaged with the pole pin hole 16c of the release lever 16 through the pole pin hole 11La14, the pole pin 13f slides and moves downward in the pole pin hole 16c. Accordingly, the pole 13 also rotates clockwise in FIG. 7 around the pole shaft pin 13P. When the hook contact surface 14b1 of the cam 14 that rotates clockwise in FIG. 7 together with the pole 13 is separated from the cam contact surface portion 12b12 of the hook 12, the hook 12 rotates clockwise in FIG. 7 by the rotational biasing force of the hook spring 12S. And the engagement with the striker 8 is released. Then, the first locking surface portion 12c3 of the hook 12 contacts the locking end portion 13a of the pole 13, and the clockwise rotation of the hook 12 in FIG. When the pole 13 is further rotated clockwise in FIG. 7 about the pole shaft pin 13P, the first locking surface portion 12c3 of the hook 12 is separated from the locking end portion 13a of the pole 13, and the hook 12 is hooked to the hook spring 12S. 7 is rotated clockwise in FIG. 7 by the urging force generated by, so that the engagement with the striker 8 is completely released. FIG. 7 shows a state in which the hook 12 is completely disengaged from the striker 8. At this time, the pole pin 13 f of the pole 13 is positioned in the vicinity of the center of the pole pin hole 16 c of the release lever 16.

  FIG. 8 shows an unlocked state of the locking device 7 when the vehicle seat 1 is in a retracted state (FIG. 2) where the vehicle seat 1 is flipped forward relative to the floor FL. The release lever 16 is pulled toward the front by the operation cable 20 when the seat back 3 is pushed down toward the folding position where the seat back 3 is overlapped with the seat cushion 2, and is disposed on the left base plate 11L (not shown). The rotation is stopped by contacting the stopper. At this time, the pole 13 is rotated clockwise in FIG. 8 as the pole pin 13f slides downward in the pole pin hole 16c of the release lever 16, and the pole pin 13f is rotated at the lower end of the pole pin hole 16c. The rotation is stopped at the side. At this time, the striker 8 is not in the recess 11Lb1 of the left base plate 11L and the recess 11Rb1 of the right base plate 11R, and the hook 12 is rotated clockwise (in the unlocking direction) around the hook shaft pin 12P by the hook spring 12S. To) is biased. Then, the tip end portion of the protrusion 12c2 of the hook 12 abuts on the hook sliding surface portion 13g of the pole 13, and the clockwise rotation of the hook 12 in FIG. The cam 14 is biased by rotating the pole 13 clockwise about the pole shaft pin 13P in FIG. 8 with the cam contact pin 13e of the pole 13 in contact with the pole contact portion 14a2. 8 is rotated clockwise in FIG. 8 around the pole shaft pin 13P against the urging force of. The rotation is stopped in a state where the urging force by the urging plate 15 and the pressing force by the cam contact pin 13e are balanced. At this time, the hook contact surface 14b1 of the cam 14 is located above the bulging portion 12b11 of the hook 12, and the left side surface of the cam 14 is in contact with the right side surface of the thin portion 12c of the hook 12. The right side surface of the cam 14 is in contact with the left side surface of the urging plate 15, and the right side surface of the urging plate 15 is opposed to the left side surface of the right base plate 11R with a slight gap. Transition from the unlocked state to the locked state of FIG.

  As described above, the pole pin hole 16c of the release lever 16 is slidably engaged with the pole pin 13f of the pole 13, so that the pole 13 is rotated by the biasing force of the coil spring 16S of the release lever 16 with the hook 12. It is formed to rotate in the engaging direction. Further, the pole pin hole 16c has a straight line connecting the contact point TP1 and the release lever shaft center 17C with the pole 13 engaged with the hook 12 as a line segment A, and the contact point TP2 and the release lever shaft center 17C. The connected line is defined as a line segment B, and a line obtained by projecting the line segment A parallel to the biasing direction X with respect to a straight line passing through the release lever axis 17C perpendicular to the biasing direction X is defined as a line segment AP and biasing direction X. Assuming that a line obtained by projecting the line segment B parallel to the urging direction X with respect to a straight line passing through the release lever axis 17C perpendicularly is a line segment BP, the value of the line segment AP / line segment BP becomes smaller than 1. Is formed. Thus, in a state where the pole 13 is engaged with the hook 12, the pole pin 13f of the pole 13 can be pressed with a force larger than the tensile force of the coil spring 16S. The coil spring 16S can be reduced in size compared with the case where the spring 16S is directly attached to the pole pin 13f.

  Further, since the cable connection hole 16b of the release lever 16 is located at a position where the radial distance from the release lever shaft center 17C is longer than the spring locking hole 16d, the release lever 16 is resisted against the tensile force of the coil spring 16S. The force to be pulled and rotated by the operation cable 20 having one end connected to the cable connection hole 16b can be reduced, and an increase in the operation force during unlocking can be suppressed.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, the following can be mentioned.

  1. In the said embodiment, what was used as a means for locking the seat 1 for motor vehicles to the floor FL was illustrated as a locking device. However, the present invention is not limited to this, and the locking device of the present invention may be any locking device that locks the locking mechanism provided on one of the members locked to each other to the striker provided on the other, and uses thereof. Is not particularly limited. For example, the lock mechanism may be provided on the floor and the striker may be provided on the automobile seat 1.

  2. In the said embodiment, the base plate 11 illustrated what was formed by two sheets, the left base plate 11L and the right base plate 11R. However, the present invention is not limited to this, and the base plate can be formed by only one sheet.

  3. In the above-described embodiment, the coil spring 16S is used as the biasing spring. However, the present invention is not limited to this, and a torsion spring can be used as long as a tension biasing force can be applied between the spring locking hole 16d and the spring locking portion 11La22. Other springs may be used.

  4). Although the present invention is applied to an automobile seat, it may be applied to a seat mounted on an airplane, a ship, a train, or the like.

1 Car Seat 7 Lock Device (Vehicle Seat Lock Device)
8 Striker 10 Lock mechanism 11 Base plate 11L Left base plate (base plate)
11La22 Spring locking part (other end part)
11Lb1 Recess 11R Right base plate (base plate)
11Rb1 Recess 12 Hook 12P Hook shaft pin (hook shaft)
13 pole 13P pole shaft pin (pole shaft)
13f Pole pin (protrusion)
14 Cam 15 Biasing plate 16 Release lever 16b Cable connection hole (traction section)
16c Pole pin hole (long hole)
16d Spring locking hole (one end)
16S coil spring (biasing spring)
17 Release lever shaft pin (Release lever shaft)
A line segment (A)
AP line segment (AP)
B line segment (B)
BP line segment (BP)
FL floor TP1 This contact (the point where the protrusion abuts the release lever)
TP2 Contact (spring mounting part)
X Energizing direction

Claims (2)

A vehicle seat locking device comprising:
A striker provided on one of the two members locked to each other, and a lock mechanism provided on the other,
The locking mechanism is
A base plate having a recess capable of receiving the striker and a pivot shaft pivotally supported by a hook shaft perpendicular to the base plate so that the striker is pushed by the movement into the recess and is rotated between the recess and the recess. And a hook which is in a locked state sandwiching the striker and is urged to rotate in the unlocking direction,
A pole that is pivotally supported by a pole axis perpendicular to the base plate and engages with the hook to hold the hook in the locked state;
A release lever that is pivotally supported by a release lever shaft perpendicular to the base plate and is slidably engaged with the pole to rotate the pole;
One end portion is attached to the release lever and the other end portion is attached to the base plate, and is provided with a biasing spring that biases the one end portion in the tensile direction with respect to the other end portion,
The pole has a protrusion erected in parallel with the pole axis at a position spaced radially from the pole axis,
The release lever is a plate-like member, and is mounted so as to surround the one end of the biasing spring provided at a position radially separated from the release lever shaft, and curved so as to surround the spring attachment portion. And a long hole that slidably engages with the protrusion,
The elongated hole is configured to rotate in a direction in which the pawl is engaged with the hook by rotation due to the urging force of the urging spring of the release lever.
A straight line connecting the point where the protrusion abuts the release lever and the axis of the release lever shaft in a state where the pole is engaged with the hook is A, and the axis of the spring mounting portion and the release lever shaft A straight line connecting the centers is defined as B, and A and B are perpendicular to the biasing direction which is the direction of the tension biasing force of the biasing spring and are in the biasing direction with respect to a line passing through the axis of the release lever shaft. A vehicle seat locking device formed such that AP / BP is smaller than 1 when projected lines are AP and BP, respectively. The release lever according to claim 1, further comprising a pulling portion provided at a position spaced radially from the release lever shaft from the spring mounting portion.
The elongate hole rotates the pawl to release the engagement with the hook by pulling the release lever against the biasing force of the bias spring by pulling the release lever. A vehicle seat locking device configured to shift the hook from a locked state in which the striker is held between the recess and the recess to a state in which the hook is disengaged from the striker.

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