JP4171697B2 - Webbing take-up device and latch detection device - Google Patents

Description

  The present invention relates to a webbing take-up device and a latch detection device attached to a seat back of a vehicle.

  In recent years, in a vehicle (RV vehicle) or the like called a recreational vehicle, for example, a webbing belt winding device is attached to a seat back such as a center seat of a rear seat.

  Furthermore, when specializing in a webbing belt take-up device attached to a seat back that can tilt with respect to the seat cushion, the webbing belt cannot be pulled out from the take-up device unless the rear back seat is positioned at a position where it can be fixed. Inventions have been proposed, and examples thereof are disclosed in Patent Document 1 and Patent Document 2 below.

  The inventions described in Patent Document 1 and Patent Document 2 include a winding portion that is provided inside a seat back and includes a winding shaft of a webbing belt, and is attached to the winding portion under predetermined conditions. A rotation preventing portion for preventing rotation of the take-up shaft and a seat back provided with one end connected to the rotation preventing portion via a tension cable and the other end attached to a seat cushion corresponding to the seat back And a latch bolt that can be engaged with the disc.

  The latch bolt is rotatably supported by a support member at a central portion so as to move like a so-called seesaw. Corresponding to the other end of the latch bolt, the disk is provided with a notch formed in a concave shape, and the other end of the latch bolt can be engaged with the notch. When the seat back is positioned at a position where it can be fixed, the other end of the latch bolt engages with the notch of the disk, and one end of the latch bolt pulls the tension cable, and the rotation prevention part operates to prevent the winding shaft from rotating. This is a configuration in which the winding shaft is rotatable. That is, if the occupant recognizes that the webbing belt can be pulled out from the winding unit, the occupant can recognize that the seat back is positioned at a position where it can be fixed.

However, in the inventions described in Patent Document 1 and Patent Document 2, even when the seat back is positioned at a position where it can be fixed, the latch bolt is incompletely engaged with the notch of the disk ( (Incomplete latch state). In the inventions described in Patent Document 1 and Patent Document 2, the tension cable is pulled by one end of the latch bolt even in the incompletely latched state. The shaft becomes free to rotate. That is, even in such an incompletely latched state, the webbing belt can be pulled out from the take-up portion and attached.
JP-A-11-263196 Japanese Patent Laid-Open No. 11-227564

  In view of the above problems, the present invention provides a latch detection device that can accurately detect the latching state of a latch member attached to a seat back, and a webbing that can regulate the withdrawal of a webbing belt not only when not latched but also when incompletely latched. An object is to provide a winding device.

  A webbing take-up device according to a first aspect of the invention has a take-up shaft in which a base end portion of a long belt-like webbing belt is locked so as to be able to be taken out and pulled out, and can be tilted with respect to a seat cushion. A take-up mechanism built in the seat back, a lock bar that protrudes toward the seat back and is fixed to the vehicle body, and is provided on the seat back corresponding to the lock bar, and is attached to the seat back in a predetermined direction by a biasing means. And a latch member engaged with the lock bar by moving in the predetermined direction at a predetermined tilt position of the seat back with respect to the seat cushion, and facing the lock bar in the tilt direction of the seat back and The latch member is disposed on the seat back in a state of preventing the movement of the latch member in the predetermined direction. The latch member is connected to the latch member via a wire and a trigger member that releases the movement-preventing state of the latch member by being pressed. In a normal state, the latch member is engaged with the winding mechanism to engage the winding shaft. A rotation preventing mechanism that prevents rotation and releases the engagement state with the winding mechanism by the movement of the latch member in the predetermined direction.

  According to the webbing take-up device of the first aspect, when the seat back is tilted to the predetermined tilt position with respect to the seat cushion, the trigger member is pressed by the lock bar, and the latch member is prevented from moving. The state is released. When the movement preventing state of the latch member is released, the latch member is moved in a predetermined direction by the urging force of the urging means and is engaged with the lock bar. As a result, the seat back is fixed at a predetermined tilt position with respect to the seat cushion and is also fixed to the vehicle body.

  In this case, the wire is pulled by the latch member. When the wire is pulled by the latch member, the rotation prevention mechanism releases the state engaged with the winding mechanism, and the winding shaft is rotatable. As a result, the occupant can pull out the webbing belt from the webbing take-up device. Therefore, the occupant can recognize that the seat back is fixed to the seat cushion and the vehicle body.

  On the other hand, in a normal state, that is, in a state where the seat back is not fixed to the seat cushion and the vehicle body (a state where the latch member is not engaged with the lock bar), the rotation prevention mechanism is engaged with the winding mechanism, The rotation of the winding shaft is prevented. As a result, the occupant cannot pull out the webbing belt from the webbing take-up device. Therefore, the occupant can recognize that the seat back is not fixed to the seat cushion and the vehicle body, and can recognize that an operation of fixing the seat back to the seat cushion and the vehicle body is necessary.

  Here, in the conventional webbing retractor, the occupant may be able to pull out the webbing belt even when the lock bar and the latch member are not sufficiently engaged (incompletely latched state). For this reason, the occupant may mistakenly recognize that the seat back is fixed although it is not fixed to the seat cushion and the vehicle body.

  In this regard, in the webbing take-up device according to the present invention, the latch member is normally prevented from moving by the trigger member, and the latch member cannot move unless the trigger member moves. Moreover, the trigger member is not moved unless the seat back is tilted to a predetermined tilt position. That is, the seat back is tilted to a predetermined tilt position, the latch member is moved after the trigger member is pressed by the lock bar, and is completely engaged with the lock bar, and the seat back is fixed to the seat cushion and the vehicle body. Unless this is the case, the wire is not pulled through this latch member. Accordingly, since the webbing belt cannot be pulled out unless the wire is pulled, the occupant can accurately recognize whether or not the seat back is fixed to the seat cushion and the vehicle body. Further, since the webbing take-up device is configured as described above, the webbing belt can be pulled out not only when the lock bar and the latch member are not latched but also when the latch is incompletely latched.

  A webbing take-up device according to a second aspect of the invention has a take-up shaft in which a base end portion of a long belt-like webbing belt is locked so as to be able to be taken out and pulled out, and can be tilted with respect to a seat cushion. A winding mechanism built in the seat back, a lock bar that protrudes toward the seat back and is fixed to the vehicle body, and is provided in the seat back corresponding to the lock bar, and includes a first position and a second position. Between the second position side and the first position side by the biasing means, and moves to the first position at a predetermined tilt position of the seat back with respect to the seat cushion. A latch member that engages with the lock bar, and is provided on the seat back, and is moved together with the latch member when the latch member moves from the first position to the second position; and A trigger member that is engaged with and held by the lock bar in the moving position when the latch member after is engaged with the lock bar, and is connected to the trigger member via a wire, and is in a normal state. Is engaged with the take-up mechanism to prevent the take-up shaft from rotating, the trigger member is held in engagement by the lock bar, and the latch member moves to the first position. And a rotation preventing mechanism for releasing the engaged state with the mechanism.

  According to the webbing take-up device of the second aspect of the present invention, when the seat back is tilted to a predetermined tilt position with respect to the seat cushion and is fixed to the seat cushion and the vehicle body, it is applied by the biasing means. The latch member is moved from the first position to the second position by applying an external force against the force to the latch member. Further, when the latch member moves from the second position to the first position, for example, when the application of the external force is stopped when the seat back is tilted to the predetermined tilt position, the latch member engages with the lock bar. As a result, the seat back is fixed at a predetermined tilt position with respect to the seat cushion and is also fixed to the vehicle body.

  Furthermore, when the latch member is moved from the first position to the second position as described above, the trigger member is also moved together with the latch member, and thereafter, the latch member is moved again to the first position and the lock bar is moved. At the time of engagement, the trigger member is engaged with and held by the lock bar in the position when moved from the first position to the second position together with the latch member.

  When the trigger member is engaged and held by the lock bar and the latch member moves to the first position, the wire is pulled more than a predetermined length. For this reason, the rotation preventing mechanism releases the engaged state with the winding mechanism, and the winding shaft of the winding mechanism becomes rotatable. As a result, the occupant can pull out the webbing belt from the webbing take-up device. Therefore, the occupant can recognize that the seat back is fixed to the seat cushion and the vehicle body.

  On the other hand, in a normal state, that is, in a state where the seat back is not fixed to the seat cushion and the vehicle body (a state where the latch member is not engaged with the lock bar), the rotation prevention mechanism is engaged with the winding mechanism, The rotation of the winding shaft is prevented. As a result, the occupant cannot pull out the webbing belt from the webbing take-up device. Therefore, the occupant can recognize that the seat back is not fixed to the seat cushion and the vehicle body, and can recognize that an operation of fixing the seat back to the seat cushion and the vehicle body is necessary.

  Here, in the conventional webbing take-up device, there is a case where the occupant can pull out the webbing belt even when the lock bar and the latch member are not sufficiently engaged. For this reason, the occupant mistakenly recognizes that the seat back is fixed although it is not fixed to the seat cushion and the vehicle body.

  In this regard, in the webbing retractor according to the present invention, the latch member does not move to the first position and engage with the lock bar unless the seat back is tilted to the predetermined tilt position, and the latch member The trigger member is engaged and held by the lock bar only after moving from the second position to the first position and engaging the lock bar. That is, unless the seat back is tilted to the predetermined tilt position and the lock bar and the latch member are completely engaged and fixed to the seat cushion and the vehicle body, the trigger member is not engaged and held by the lock bar. The wire is not pulled more than a predetermined length via the trigger member. Accordingly, since the webbing belt cannot be pulled out unless the wire is pulled, the occupant can accurately recognize whether or not the seat back is fixed to the seat cushion and the vehicle body. Further, since the webbing take-up device is configured as described above, the webbing belt can be pulled out not only when the lock bar and the latch member are not latched but also when the latch is incompletely latched.

  According to a third aspect of the present invention, there is provided a latch detection device that is provided on the seat back corresponding to the lock bar, and a lock bar that protrudes toward the seat back that can tilt with respect to the seat cushion and is fixed to the vehicle body. And a latch member that is urged in a predetermined direction by the urging means and engages with the lock bar by moving in the predetermined direction, and is opposed to the lock bar in the tilting direction of the seat back and Arranged in the seat back in a state of preventing movement in the predetermined direction, and released from the movement blocking state of the latch member by being pressed by the lock bar at a predetermined tilt position of the seat back with respect to the seat cushion. A trigger member that is connected to the latch member, and is pulled by moving the latch member in the predetermined direction. The wire being, characterized by comprising a.

  According to the latch detection device of the third aspect of the invention, when the seat back is tilted to the predetermined tilt position with respect to the seat cushion, the trigger member is pressed by the lock bar, and the latch member is prevented from moving. Is released. When the movement preventing state of the latch member is released, the latch member is moved in a predetermined direction by the urging force of the urging means and is engaged with the lock bar. As a result, the seat back is fixed at a predetermined tilt position with respect to the seat cushion and is also fixed to the vehicle body.

  In this case, the wire is pulled by the latch member (tensile state). That is, since the wire is pulled when the lock bar and the latch member are engaged, it is recognized that the latch member is engaged with the lock bar.

  Here, in the conventional latch detection device, even if the lock bar and the latch member are not sufficiently engaged, the tension line connected to the latch member may be pulled. For this reason, it is erroneously recognized that the lock bar and the latch member are completely engaged even though they are not completely engaged (that is, the seat back is fixed to the seat cushion and the vehicle body). There was a case.

  In this regard, in the latch detection device according to the present invention, the latch member is normally prevented from moving by the trigger member, and the latch member cannot move unless the trigger member moves. Moreover, the trigger member is not moved unless the seat back is tilted to a predetermined tilt position. That is, the seat back is tilted to a predetermined tilt position, the latch member is moved after the trigger member is pressed by the lock bar, and is completely engaged with the lock bar, and the seat back is fixed to the seat cushion and the vehicle body. Unless this is the case, the wire is not pulled through this latch member. Therefore, the state in which the lock bar is engaged with the latch member can be accurately detected.

  As described above, the latch detection device according to the present invention can accurately detect the state in which the latch member is engaged with the lock bar. For this reason, this latch detection device can be applied to, for example, a webbing belt winding device built in the seat back so that the winding device is interlocked with the latch detection device. In this case, for example, the webbing belt cannot be pulled out unless the latch member is engaged with the lock bar (the seat back is fixed to the seat cushion and the vehicle body). If it is confirmed that the seat can be pulled out, it can be recognized that the seat back is fixed to the seat cushion and the vehicle body.

  According to a fourth aspect of the present invention, there is provided a latch detection device that is provided on the seat back corresponding to the lock bar, and a lock bar that protrudes toward the seat back that can be tilted with respect to the seat cushion and is fixed to the vehicle body. And is movable between the first position and the second position, urged by the urging means from the second position side toward the first position side, and a predetermined amount of the seat back with respect to the seat cushion is determined. A latch member that engages with the lock bar by moving to the first position in the tilted position, and the latch provided when the latch member moves from the first position to the second position. A trigger member that is moved together with the member and that is held in engagement with the lock bar in the moved position when the subsequent latch member is engaged with the lock bar; A wire that is connected to the trigger member, is held in engagement by the lock bar, and is pulled by a predetermined length by moving the latch member to the first position. It is characterized by having.

  According to the latch detection device of the fourth aspect of the present invention, when the seat back is tilted to a predetermined tilt position with respect to the seat cushion and fixed to the seat cushion and the vehicle body, the biasing force by the biasing means is provided. The latch member is moved from the first position to the second position, for example, by applying an external force against the latch member to the latch member. Further, when the latch member moves from the second position to the first position, for example, when the application of the external force is stopped when the seat back is tilted to the predetermined tilt position, the latch member engages with the lock bar. As a result, the seat back is fixed at a predetermined tilt position with respect to the seat cushion and is also fixed to the vehicle body.

  Furthermore, when the latch member is moved from the first position to the second position as described above, the trigger member is also moved together with the latch member, and thereafter, the latch member is moved again to the first position and the lock bar is moved. At the time of engagement, the trigger member is engaged with and held by the lock bar in the position when moved from the first position to the second position together with the latch member.

  When the trigger member is engaged and held by the lock bar and the latch member moves to the first position, the wire is pulled by a predetermined length or more (tensile state). That is, if the lock bar and the latch member are engaged, the wire is pulled more than a predetermined length, so that it is recognized that the latch member is engaged with the lock bar.

  Here, in the conventional latch detection device, even if the lock bar and the latch member are not sufficiently engaged, the tension line connected to the latch member may be pulled. Therefore, the seat back is in a completely engaged state (that is, a state in which the seat back is fixed to the seat cushion and the vehicle body) although the lock bar and the latch member are not completely engaged. It was sometimes mistakenly recognized.

  In this regard, in the latch detection device according to the present invention, the latch member does not move to the first position and engage with the lock bar unless the seat back is tilted to the predetermined tilt position. The trigger member is engaged and held by the lock bar only after moving from the second position to the first position and engaging the lock bar. That is, unless the seat back is tilted to the predetermined tilt position and the lock bar and the latch member are completely engaged and fixed to the seat cushion and the vehicle body, the trigger member is not engaged and held by the lock bar. The wire is not pulled through the trigger member. Therefore, the state in which the lock bar is engaged with the latch member can be accurately detected.

  As described above, the latch detection device according to the present invention can accurately detect the state in which the latch member is engaged with the lock bar. For this reason, this latch detection device can be applied to, for example, a webbing belt winding device built in the seat back so that the winding device is interlocked with the latch detection device. In this case, for example, the webbing belt cannot be pulled out unless the latch member is engaged with the lock bar (the seat back is fixed to the seat cushion and the vehicle body). If it is confirmed that the seat can be pulled out, it can be recognized that the seat back is fixed to the seat cushion and the vehicle body.

  As described above, the latch detection device according to the present invention can accurately detect the latch state of the latch member attached to the seat back.

  Further, the webbing take-up device according to the present invention can regulate the withdrawal of the webbing belt not only when not latched but also when imperfectly latched.

(First embodiment)
FIG. 1 schematically shows a webbing take-up device 10 that includes a latch detection device 100 according to a first embodiment of the present invention. The webbing retractor 10 is provided in a rear seat of the vehicle. The rear seat includes a seat cushion 200 and a seat back 202, and the seat back 202 can be tilted with respect to the seat cushion 200. When the seat cushion 200 is tilted forward, the vehicle compartment 204 and the trunk space 206 provided behind the rear seat communicate with each other.

  The above-described webbing retractor 10 is built in the seat back 202 in order to restrain the body of an occupant seated in such a rear seat of the vehicle.

  FIG. 2 is a longitudinal sectional view schematically showing a winding unit 11 as a winding mechanism constituting the webbing winding device 10. The winding unit 11 includes a frame 14 formed in a substantially U shape in plan view, and the frame 14 is fixedly disposed inside a seat back 202 of a rear seat. The frame 14 includes a pair of leg plates 16 and 18 extending in parallel with each other. A spool 12 made by die casting is rotatably supported between the leg plates 16 and 18.

  The spool 12 includes a substantially cylindrical spool shaft 12A constituting an axial center portion, a flange portion 12B formed in a substantially disc shape at an end portion on the leg plate 16 side of the spool shaft 12, and a leg plate 18 side of the spool shaft 12A. 12C of flange parts formed in the substantially disc shape at the side end part. Such a spool 12 has a substantially drum shape as a whole.

  A proximal end portion of a long belt-like webbing belt 208 (not shown in FIG. 2; see FIG. 1) is locked to the spool shaft 12A, and can be taken up and pulled out as the spool 12 rotates. ing. The leading end side of the webbing belt 208 is exposed to the outside of the seatback 202 through a webbing insertion hole (not shown) formed in the seatback 202.

  A shaft insertion hole 20 is formed in the axial center portion of the spool shaft 12A. On the flange portion 12B side of the shaft insertion hole 20, a lock base receiving portion 22 is formed coaxially with the spool shaft 12A. The lock base receiving portion 22 has a concave shape whose diameter is larger than that of the shaft insertion hole 20.

  A lock base 24 manufactured by die casting is attached to the lock base receiving portion 22 in a state in which it is prevented from coming off. The lock base 24 is attached by inserting a stopper (prevention member) (not shown) formed in a substantially U shape into the lock base 24 after the lock base 24 is inserted into the lock base receiving portion 22 in the axial direction. A method of press-fitting from a direction perpendicular to the axis is adopted so as to straddle a groove (not shown) formed on the outer peripheral surface of the base portion 24A and a groove (not shown) formed on the inner peripheral surface of the spool shaft 12A. Yes.

  The lock base 24 is formed in a cylindrical shape with a hook. The lock base 24 is arranged in a state where the base end portion 24A is fitted to the lock base receiving portion 22 and the diameter is larger than that of the base end portion 24A and is in contact with the stepped portion of the lock base receiving portion 22. The intermediate portion 24B and the holding portion 24C which is larger in diameter than the intermediate portion 24B and arranged in contact with the outer surface of the flange portion 12B. Such a lock base 24 is formed with a hexagonal fitting hole 26 except for the outer end of the axial center. Further, a small hole 28 is formed at the outer end of the shaft center portion of the lock base 24 and communicates with the shaft center portion of the fitting hole 26 and has a diameter smaller than that.

  On the other hand, on the flange portion 12 </ b> C side of the shaft insertion hole 20, a recessed sleeve receiving portion 30 having a diameter larger than that of the shaft insertion hole 20 is formed. A female spline is formed on the inner peripheral portion of the sleeve receiving portion 30.

  A sleeve 34 is fitted in the sleeve receiving portion 30. A male spline corresponding to the female spline formed on the inner peripheral portion of the sleeve receiving portion 30 is formed on the outer peripheral portion of the sleeve 34. Furthermore, a fitting hole 32 formed in a hexagonal hole shape is formed in the axial center portion of the sleeve 34. The inner end of a mainspring spring (not shown) that urges the spool 12 to rotate in the webbing take-up rotation direction is locked to the tip of the sleeve 34 via an adapter (not shown).

  The lock base 24 and the sleeve 34 as described above are connected to each other by the torsion bar 36. The torsion bar 36 is formed at the shaft portion 36A constituting the main portion thereof, the hexagonal head portion 36B formed at the sleeve 34 side end portion of the shaft portion 36A, and the lock base 24 side end portion of the shaft portion 36A. A hexagonal fitting portion 36C, a gear holding portion 36D extending coaxially from the axial center of the fitting portion 36C and having a diameter smaller than that of the shaft portion 36A, and a tapered surface from the gear holding portion 36D. A small-diameter portion 36E extended with a constant diameter after being reduced in diameter, and a tip portion 36F that is further coaxially extended from the small-diameter portion 36E and formed with a key.

  The head portion 36 </ b> B of the torsion bar 36 is fitted into a hexagonal hole-shaped fitting hole 32 formed in the sleeve 34. Further, the fitting portion 36 </ b> C of the torsion bar 36 is fitted into a hexagonal fitting hole 26 formed in the lock base 24. Thereby, the torsion bar 36 is integrated with the spool shaft 12 </ b> A via the lock base 24 and the sleeve 34.

  Further, on the front side of the holding portion 24C of the lock base 24 described above, a concave accommodating portion 40 formed in the circumferential direction around the small hole 28 is formed. The end of the accommodating portion 40 on the spool 12 side is closed, but the opposite end of the accommodating portion 40 from the spool 12 is open. In the accommodating portion 40, a single lock plate 42 having a substantially arc plate shape is accommodated.

  Further, at a position adjacent to the lock base 24 described above, a V-gear 46 serving as a substantially disk-shaped winding mechanism having a larger diameter than the lock base 24 is disposed. A cylindrical boss 48 is formed at the axial center of the V gear 46 and is pivotally supported by the gear holding portion 36D of the torsion bar 36 so as to be able to follow and rotate. Further, lock teeth 46 </ b> A are integrally formed on the outer peripheral portion of the V gear 46. The V gear 46 is prevented from rotating by an acceleration sensor (not shown) during sudden deceleration of the vehicle.

  A resin holder 70 is disposed outside the V gear 46 (on the side opposite to the lock base 24 with respect to the V gear 46). Further, a resin cover 72 having a shape similar to that of the holder 70 is disposed outside the holder 70. The holder 70 and the cover 72 are integrally fixed to the leg plate 16 of the frame 14. .

  Inside the cover 72, an engagement member 60 having a ratchet tooth 60 </ b> A that can mesh with the lock tooth 46 </ b> A of the V gear 46 is disposed below the V gear 46.

  Further, a wire 62 is connected to the engaging member 60 from below. The wire 62 passes through the cover 72 and is drawn to the outside. The wire 62 is covered with a wire shield except for both ends thereof. One end portion 66 of the wire shield is fixed to the bottom portion 72 </ b> A of the cover 72. Further, inside the cover 72, a torsion coil spring 64 is coaxially disposed with respect to the wire 62 between the end portion 66 of the wire shield and the engagement member 60 described above. One end of the torsion coil spring 62 is in contact with the lower part of the engagement member 60, and the other end of the torsion coil spring 62 is in contact with the upper part of the end portion 66 of the wire shield.

  Accordingly, in the normal state, the engaging member 60 is biased upward by the torsion coil spring 64, and extends from the end portion 66 of the wire shield so that its own ratchet teeth 60A are locked to the locking teeth 46A of the V gear 46. (See FIGS. 2 and 3). The engagement member 60 contracts toward the end portion 66 of the wire shield by a dimension larger than the dimension of the lock teeth 46A in the radial direction of the V gear 46 when the wire 62 is pulled by a predetermined length or more. It has a configuration (see FIG. 4). Note that a space in which the end portion of the wire 62 can slightly move in the vertical direction with respect to the engaging member 60 is formed inside the engaging member 60, thereby eliminating problems caused by excessive pulling of the wire 62.

  As shown in FIG. 1, the other end of the wire 62 is connected to a latch detection device 100 that detects that the seat back 202 is fixed to the seat cushion 200 and the upper wall portion 210 of the trunk space 206. . The latch detection device 100 is built in the seat back 202 together with the winding unit 11 described above.

  As shown in FIG. 5, the latch detection device 100 includes a case 102. The case 102 is formed in a substantially rectangular parallelepiped shape. An insertion hole 114 is formed in the standing wall portion 116 of the case 102 facing the lock bar 120. The lower part of the case 102 is closed by the bottom part 118. The other end portion 67 of the wire shield is fixed to the left end portion of the bottom portion 118. In addition, the bottom portion 118 includes a bottomed cylindrical portion 118A, a part of which protrudes downward and has a bottomed cylindrical shape.

  Inside the case 102, a torsion coil spring 112 as a biasing means is coaxially disposed inside the bottomed cylindrical portion 118A.

  A latch member 110 is disposed above the bottom portion 118. The torsion coil spring 112 is engaged with the lower portion of the latch member 110, and the latch member 110 is biased upward.

  The latch member 110 is provided on the lock bar 120 side with respect to the central portion and extends upward, and the latch member 110 is provided on the opposite side of the lock bar 120 with respect to the central portion and upward. An extended wire holding part 110B and a lever 110C provided integrally with the wire holding part 110B and extending upward are provided. The vertical dimension of the portion of the engagement protrusion 110 </ b> A that extends upward from the central part of the latch member 110 is substantially the same as the vertical dimension of the tip of the lock bar 120 (end on the latch detection device 100 side). Has been. Further, the vertical dimension of the portion of the wire holding portion 110B that extends upward from the central portion of the latch member 110 is the vertical direction of the portion of the engaging protrusion 110A that extends upward from the central portion of the latch member 110. The latch member 110 is formed in a substantially L shape as a whole.

  A portion of the wire holding portion 110 </ b> B of the latch member 110 that is opposite to the lock bar 120 is exposed to the outside of the case 102 and is connected to the other end of the wire 62 described above. When the latch member 110 moves upward, the wire 62 is pulled upward.

  In addition, a trigger member 104 is provided above the engagement protrusion 110 </ b> A of the latch member 110. The trigger member 104 is provided integrally with a base 106 of a substantially plate-like body arranged facing the side wall of the case 102, a bottom 106B formed integrally with the lower end thereof, and above both ends of the bottom 106B. The standing wall portions 106A and 106C that extend in parallel from the base 106, and are integrally provided on the upper portion of the base 106 to engage with the side wall portion of the case 102, and the trigger member 104 is connected to the side wall of the case 102. And a cylindrical shaft portion 106D that is rotatably supported. The standing wall portion 106C is disposed on the opposite side of the standing wall portion 106A from the lock bar 120 side. The position of the upper end of the standing wall portion 106C is higher than the position of the upper end of the standing wall portion 106A, and is almost the same height as the center position of the shaft portion 106D. The bottom portion 106B and the standing wall portions 106A and 106C are formed in a substantially U shape as a whole.

  The position of the bottom portion 106B of the trigger member 104 is substantially the same as the position of the lower end of the insertion hole 114 of the case 102 described above. The bottom portion 106B is in contact with the upper portion of the engaging protrusion 110A of the latch member 110 described above, and prevents the latch member 110 from moving upward. In this state, the position of the upper end of the engagement protrusion 110 </ b> A of the latch member 110 is set so as not to be higher than the position of the lower end of the insertion hole 114 of the case 102.

  Further, the standing wall portion 106 </ b> A of the trigger member 104 corresponds to the insertion hole 114 described above, and is set to a size that can close the insertion hole 114 from the inside of the case member 102.

  A torsion coil spring 108 is wound around the shaft portion 106 </ b> D of the trigger member 104. The torsion coil spring 108 is wound around the shaft portion 106D of the trigger member 104 and the winding portion 108C around the shaft portion 106D of the trigger member 104 in the counterclockwise direction. The extending portion 108A that is in contact with the portion 102A of the standing wall portion 116 above the insertion hole 114 inside the case 102 and the shaft portion 106D of the trigger member 104 are wound around the winding portion clockwise. An extended portion 108B that extends from substantially below 106D in the upper left direction and is in contact with the upper portion of the standing wall portion 106C is provided.

  Such a torsion coil spring 108 urges the trigger member 104 counterclockwise. Accordingly, the trigger member 104 always tries to rotate counterclockwise, but the movement in that direction is restricted by the standing wall portion 116 of the case 102.

  The lock bar 120 is fixedly disposed on the upper wall portion 210 of the trunk space 206. The lock bar 120 protrudes toward the seat back 202 and faces the standing wall portion 106A of the trigger member 106 in the tilting direction of the seat back 202 (in other words, the standing wall portion 116A of the trigger member 106 is Facing the lock bar 120 in the tilting direction). The lock bar 120 is formed in a substantially U shape when viewed from above, and both ends thereof are connected to the upper wall portion 210 of the trunk space 206 of the vehicle body. Therefore, in a top view, the lock bar 120 is integrated with the upper wall portion 210 of the trunk space 206 to form a closed loop, and the insertion hole of the lock bar 120 formed in the vertical direction is an engagement protrusion of the latch member 110. Corresponding to the portion 110A, it is formed so as to be engageable with the engaging protrusion 110A.

  Next, the operation of the first exemplary embodiment of the present invention will be described.

  When the seat back 202 is tilted with respect to the seat cushion 200 to a tilt position that can be fixed to the seat cushion 200 and the upper wall portion 210 of the trunk space 206 (see the arrow in FIG. 1), the upper wall portion 210 of the trunk space 206. The lock bar 120 fixedly disposed in the hole passes through the insertion hole 114 formed in the case 102 of the latch detection device 100. Next, inside the case 102, the standing wall portion 106 </ b> A of the trigger member 104 is pressed by the tip end portion (end portion on the vehicle front side) of the lock bar 120, and the trigger member 104 resists the biasing force of the torsion coil spring 108. Then, it rotates in the clockwise direction (see FIG. 6). As a result, the movement blocking state of the latch member 110 is released (see FIG. 7). When the movement preventing state of the latch member 110 is released, the latch member 110 is moved upward by the urging force of the torsion coil spring 112 provided in the bottomed cylindrical portion 118A of the case 102, and the latch member 110 is latched. The engaging protrusion 110 </ b> A of the member 110 engages with the lock bar 120. As a result, the seat back 202 is fixed at a predetermined tilt position with respect to the seat cushion 200 and is also fixed to the upper wall portion 210 (that is, the vehicle body) of the trunk space 206.

  In this case, the wire 62 is pulled upward by a predetermined length by the latch member 110 (see FIG. 8). When the wire 62 is pulled by a predetermined length by the latch member 110 (see FIG. 4), the ratchet teeth 60A of the engagement member 60 release the engaged state with the lock teeth 46A of the V gear 46, and the spool 12 Can rotate freely. As a result, the occupant can pull out the webbing belt 208 from the webbing retractor 10. Therefore, the passenger can recognize that the seat back 202 is fixed to the seat cushion 200 and the upper wall portion 210 of the trunk space 206.

  On the other hand, in a normal state, that is, in a state where the seat back 202 is not fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206 (a state where the standing wall portion 110A of the latch member 110 is not engaged with the lock bar 120). The ratchet teeth 60A of the engagement member 60 are engaged with the lock teeth 46A of the V gear 46, and the rotation of the spool 12 is prevented (see FIG. 3). As a result, the occupant cannot pull out the webbing belt 208 from the webbing retractor 10. Accordingly, the occupant can recognize that the seat back 202 is not fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206, and the seat back 202 is fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206. It can be recognized that the work to be done is necessary.

  Here, in the conventional webbing retractor, the occupant may be able to pull out the webbing belt 208 even when the lock bar 120 and the latch member are not sufficiently engaged (incompletely latched state). For this reason, the occupant may misrecognize that the seatback 202 is fixed although it is not fixed to the seat cushion 200 and the upper wall portion 210 of the trunk space 206.

  In this regard, in the webbing retractor 10 according to the present embodiment, the latch member 110 is normally prevented from moving in the biasing direction by the torsion coil spring 112 by the trigger member 104, and the trigger member 104 is rotated. The latch member 110 cannot move in the biasing direction unless it moves. In addition, the trigger member 104 is not rotated unless the seat back 202 is tilted to a tilt position where the seat back 202 can be fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206. That is, after the seat back 202 is tilted to a tilt position where the seat back 202 can be fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206 and the trigger member 104 is pressed by the lock bar 120, the latch member 110 moves in the biasing direction. The wire 62 is pulled through the latch member 110 as long as it does not move and completely engage with the lock bar 120 and the seat back 202 is fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206. There is no. Accordingly, since the webbing belt 208 cannot be pulled out unless the wire 62 is pulled, the occupant accurately determines whether the seat back 202 is fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206. Can be recognized. Further, since the webbing take-up device 10 is configured as described above, the webbing belt 208 can be prevented from being pulled out not only when the lock bar 120 and the latch member 110 are not latched but also when the lock bar 120 is incompletely latched.

Further, in this way, the latch detection device 100 of the webbing retractor 10 is in a state where the lock bar 120 and the latch member 110 are completely engaged (the seat back 202 is the seat cushion 200 and the upper wall portion 210 of the trunk space 206). The wire 62 is not pulled through the latch portion 110 unless it is fixed to the state shown in FIG. Therefore, the state in which the lock bar 120 is engaged with the latch member 110 can be accurately detected.
(Second Embodiment)
Next, the webbing take-up device 10 including the latch detection device 300 according to the second embodiment of the present invention will be described. The webbing take-up device 10 according to the present embodiment is one in which a latch detection device 300 is applied in place of the latch detection device 100 described above in the first embodiment. In addition, the same code | symbol is attached | subjected to the location of the same structure and the same effect | action as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 9 is a schematic sectional view of the latch detection device 300 according to the present embodiment. The latch detection device 300 includes a case 302. The case 302 has a substantially rectangular parallelepiped shape, and both end portions in the vertical direction are closed by an upper wall portion 302A and a bottom wall portion 302B, respectively. An insertion hole 320 corresponding to the insertion hole 114 of the case 102 described above in the first embodiment is formed in the side wall 303 of the case 302 on the lock bar 120 side.

  The case 302 is provided with a latch member 305. The latch member 305 is disposed so as to face the side wall of the case 302 and is basically formed in a plate shape. The latch member 305 is integrally formed with the base 307 and can be engaged with the lock bar 120. A joint portion 304, a shaft portion 306 integrally provided on the upper portion of the engaging portion 304 and extending upward, and a lever 308 integrally formed on the upper portion of the shaft portion 306 and formed in a substantially O-shape. And.

  The engaging portion 304 of the latch member 305 is disposed inside the case 302 described above. The engaging portion 304 has a shape in which a lower right portion of a substantially rectangular parallelepiped plate is cut out in a tapered shape and has a substantially trapezoidal cross section. The engaging portion 304 is provided with a gap that allows the lock bar 120 to enter between the base 307 except for its upper end, and the engaging portion 304 enters the engaging hole of the lock bar 120. The lock bar 120 can be engaged. Normally, the engaging portion 304 faces the lock bar 120 through the insertion hole 320 of the case 302.

  A shaft portion 306 provided integrally with the engaging portion 304 passes through the upper portion 302A of the case 302 and protrudes to the outside in a state where it is pivotably supported. Therefore, the lever 308 provided integrally with the shaft portion 306 is exposed to the outside of the case 302.

  A torsion coil spring 310 as an urging means is coaxially disposed on the shaft portion 306 of the latch member 305. One end of the torsion coil spring 310 is disposed in contact with the upper portion of the engaging portion 304 of the latch member 305, and the other end of the torsion coil spring 310 is disposed below the upper wall portion 302 </ b> A of the case 302. It is in contact. Accordingly, the latch member 305 is biased downward by the torsion coil spring 310.

  A trigger member 311 is disposed inside the case 302 in a state adjacent to the latch member 305. The trigger member 311 includes a trigger main body 312 and a shaft portion 316 extending upward from the upper portion of the trigger main body 312.

  The trigger main body 312 is basically formed in a substantially rectangular parallelepiped shape, and the upper part thereof has a top plate shape and protrudes left and right. Therefore, the trigger main body 312 has a substantially T-shaped cross section as a whole. Positioning pieces that protrude to the left and right at the upper part of the trigger main body 312 are formed at the upper left part of the engaging part 304 of the latch member 305 and the base 307 of the latch member 305, respectively, and restrict the downward movement of the trigger member 311. 322 can be engaged from above.

  In addition, a recess 312A that is cut out in a step shape when viewed from the lock bar 120 side is formed below the central portion of the trigger body 312, and the tip of the lock bar 120 can enter the recess 312A. Yes. The position of the upper end of the recess 312 </ b> A is set to be higher than the position of the lower end of the engaging portion 304 of the latch member 305.

  Further, the shaft portion 316 provided integrally with the trigger main body 312 penetrates the upper wall portion 302A of the case 302, and is rotatably supported by the shaft. A torsion coil spring 318 is coaxially disposed on the shaft portion 316 of the trigger member 311. One end of the torsion coil spring 318 is disposed in contact with the upper portion of the trigger body 312, and the other end of the torsion coil spring 318 is in contact with the lower portion of the upper portion 302 </ b> A of the case 302. Therefore, the trigger member 311 is urged downward by the torsion coil spring 318. For this reason, the trigger member 311 basically restricts the movement of the latch member 305 described above.

  The trigger body 312 of the trigger member 311 is formed with a wire holding portion 314 that holds the other end of the wire 62 described in the first embodiment. The other end of the wire 62 is locked to the wire holding portion 314.

  The wire shield end 67 corresponding to the other end of the wire 62 is fixed to the lower end of the base 307 of the latch member 305. Therefore, the wire 62 is pulled in accordance with the upward movement of the trigger member 311 and further the downward movement of the latch member 305 with respect to the position of the trigger member 311.

  The wire 62 passes through the bottom 302B of the case 302 and is drawn to the outside.

  Next, the operation of the second exemplary embodiment of the present invention will be described.

  When the seat back 202 is tilted and fixed to the tilt position where the seat back 202 can be fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206 with respect to the seat cushion 200, the seat back 202 is disposed around the shaft portion 306 of the latch member 305. The latch member 305 is moved downward from the movable lower end position (first position) below the engagement portion 304 by applying an external force against the biasing force of the torsion coil spring 310 to the latch member 305. The lock bar 120 is moved to an upper position where the lock bar 120 can enter (second position, see FIG. 10). Further, when the latch member 305 moves from the second position to the first position because the application of the external force is stopped when the seat back 202 is tilted to the fixable tilt position, the latch member 305 is engaged. The joining portion 304 enters the engagement hole of the lock bar 120 and engages with the lock bar 120 (see FIG. 11). As a result, the seat back 202 is fixed at a predetermined tilt position with respect to the seat cushion 200 and is also fixed to the upper wall portion 210 of the trunk space 206.

  Furthermore, when the latch member 305 is moved from the first position to the second position as described above, the trigger member 311 is also moved together with the latch member 305, and then the latch member 305 is again moved to the first position. When the lock member 120 is engaged, the trigger member 311 causes the lock bar 120 to enter the recess 312 </ b> A of the trigger main body 312 while maintaining the position when the trigger member 311 moves from the first position to the second position together with the latch member 305. When the latch member 305 moves downward and engages with the lock bar 120 as described above, the trigger body 312 of the trigger member 311 is moved downward by the urging force of the torsion coil spring 318, and Engage and hold.

  When the trigger main body 312 of the trigger member 311 is engaged and held by the lock bar 120 and the latch member 305 is moved to the first position, the wire 62 is pulled by a predetermined length or more. For this reason, the ratchet teeth 60A of the engagement member 60 release the engagement state with the lock teeth 46A of the V gear 46, and the spool 12 becomes rotatable (see FIG. 4). As a result, the occupant can pull out the webbing belt 208 from the webbing retractor 10. Therefore, the passenger can recognize that the seat back 202 is fixed to the seat cushion 200 and the upper wall portion 210 of the trunk space 206.

  On the other hand, a normal state, that is, a state where the seat back 202 is not fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206 (a state where the engaging portion 304 of the latch member 305 is not engaged with the lock bar 120). Then, the ratchet teeth 60A of the engagement member 60 are engaged with the lock teeth 46A of the V gear 46, and the rotation of the spool 12 is prevented (see FIG. 3). As a result, the occupant cannot pull out the webbing belt 208 from the webbing retractor 10. Accordingly, the occupant can recognize that the seat back 202 is not fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206, and the seat back 202 is fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206. It can be recognized that the work to be done is necessary.

  Here, in the conventional webbing take-up device, the occupant may be able to pull out the webbing belt 208 even when the lock bar 120 and the latch member are not sufficiently engaged. For this reason, the occupant mistakenly recognizes that the seat back 202 is fixed although it is not fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206.

  In this respect, in the webbing retractor 10, the latch member 305 moves to the first position unless the seat back 202 is tilted to a tilt position that can be fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206. The trigger member 311 is not engaged with the lock bar 120 until the latch member 305 moves from the second position to the first position and engages the lock bar 120. . That is, the seat back 202 is tilted to a tilt position where the seat back 200 can be fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206, and the lock bar 120 and the latch member 305 are completely engaged with each other. Since the trigger member 311 is not engaged and held by the lock bar 120 unless the state is fixed to the upper wall portion 210, the wire 62 is not pulled beyond a predetermined length via the trigger member 311. Accordingly, since the webbing belt 208 cannot be pulled out unless the wire 62 is pulled, the occupant accurately determines whether the seat back 202 is fixed to the upper wall portion 210 of the seat cushion 200 and the trunk space 206. Can be recognized. Further, since the webbing retractor 10 is configured as described above, the webbing belt 208 can be prevented from being pulled out not only when the lock bar 120 and the latch member 305 are not latched but also when the latch is incompletely latched.

  Further, in this way, the latch detection device 300 of the webbing retractor 10 is in a state where the lock bar 120 and the latch member 305 are completely engaged (the seat back 202 is the seat cushion 200 and the upper wall portion 210 of the trunk space 206). Since the wire 62 is not in a tensioned state (a state in which the wire 62 is pulled beyond a predetermined length) via the trigger member 311 as long as the lock bar 120 is not in a fixed state), the lock bar 120 is engaged with the latch member 305. The detected state can be detected with high accuracy.

  Although the first and second embodiments of the present invention have been described above, the engaging member 60 described in these embodiments is not limited to that described in the first and second embodiments. Hereinafter, modifications of the engaging member 60 will be described.

  FIG. 12 shows an outline of a modified example of the engaging member 60. Inside the engaging portion 60, for example, a bottomed wire end holding portion formed in a cylindrical shape is formed. The upper portion of the engaging member 60 is closed by the upper wall portion 60B. Inside the engaging member 60, one end of the wire 62 is fixed to the lower portion of the upper wall portion 60B.

  Further, a torsion coil spring 330 is disposed coaxially with the wire 62 inside the engaging member 60. One end of the torsion coil spring 330 is in contact with the lower portion of the upper wall portion 60B of the engaging member 60, and the other end of the torsion coil spring 330 is a wire shield fixed to the bottom portion 72A of the cover 72. It is in contact with the upper part of the end portion 66 of this.

  Accordingly, in a normal state, the engaging member 60 is urged upward by the torsion coil spring 330 as in the first and second embodiments described above, and is fixed to the case 102 and the case 302. The ratchet teeth 60 </ b> A are extended from the end portions 66 of the arranged wire shields and engaged with the lock teeth 46 </ b> A of the V gear 46. Even when the engaging member 60 is deformed in this way, in the tension state in which the wire 62 is pulled by a predetermined length or more, the end portion of the wire shield is larger than the dimension of the lock tooth 46A in the radial direction of the V gear 46. It can be configured to contract toward the 66 side.

It is a figure which shows the outline of the seat to which the winding device comprised including the latch detection apparatus which concerns on the 1st and 2nd embodiment of this invention was applied. It is sectional drawing which shows the outline of the winding mechanism of a webbing winding apparatus. It is a side view (partial sectional view) showing an engaged state between the winding mechanism and the rotation prevention mechanism in a normal state. FIG. 4 is a side view (partial cross-sectional view) showing a state when the wire is pulled by a predetermined length in the rotation prevention mechanism of FIG. 3 and the engagement state between the winding mechanism and the rotation prevention mechanism is released. It is sectional drawing which shows the outline of the latch detection apparatus which concerns on 1st Embodiment. FIG. 6 is a diagram illustrating an initial state in which the trigger member is pressed by a lock bar in the latch detection device of FIG. 5. FIG. 6 is a view showing a state in which a latch member is engaged with a lock bar in the latch detection device of FIG. 5. It is a side view (partial sectional view) showing the state of the rotation prevention mechanism in the middle period when the wire is pulled. It is sectional drawing which shows the outline of the latch detection apparatus applied to the webbing winding device concerning a 2nd embodiment. FIG. 10 is a diagram illustrating a state in which the latch member is engaged with the lock bar in the latch detection device of FIG. 9. FIG. 10 is a diagram illustrating a state in which the latch member is engaged with the lock bar in the latch detection device of FIG. 9. It is a side view (partial sectional view) showing a modification of the rotation prevention mechanism in FIG. 3, and is a view showing an engaged state between the winding mechanism and the rotation prevention mechanism in a normal state. In the rotation prevention mechanism of FIG. 12, it is a figure which shows a state when the wire is pulled by predetermined length and the engagement state of a winding mechanism and a rotation prevention mechanism is cancelled | released.

Explanation of symbols

10 Webbing take-up device 11 Winding part (winding mechanism)
12 Spool (winding shaft)
62 Wire 46 V gear (winding mechanism)
60 engaging member (rotation prevention mechanism)
DESCRIPTION OF SYMBOLS 100 Latch detection apparatus 104 Trigger member 110 Latch member 112 Torsion coil spring (biasing means)
DESCRIPTION OF SYMBOLS 120 Lock bar 200 Seat cushion 202 Seat back 208 Webbing belt 300 Latch detection apparatus 305 Latch member 310 Torsion coil spring (biasing means)
311 Trigger member

Claims (4)

A winding mechanism built in a seat back that can tilt with respect to a seat cushion, having a winding shaft in which a base end portion of a long belt-like webbing belt is locked so as to be retractable;
A lock bar that protrudes toward the seat back and is fixed to the vehicle body;
It is provided on the seat back corresponding to the lock bar, is urged in a predetermined direction by an urging means, and moves in the predetermined direction at a predetermined tilt position of the seat back with respect to the seat cushion. An engaging latch member;
The seat back is disposed in the seat back in a state of facing the lock bar in the tilt direction of the seat back and preventing the latch member from moving in the predetermined direction, and is pressed by the lock bar at the predetermined tilt position of the seat back. A trigger member that releases the movement blocking state of the latch member,
It is connected to the latch member via a wire, engages with the winding mechanism in a normal state to prevent rotation of the winding shaft, and moves with the winding mechanism by the movement of the latch member in the predetermined direction. A rotation prevention mechanism for releasing the engagement state;
A webbing take-up device comprising: A winding mechanism built in a seat back that can tilt with respect to a seat cushion, having a winding shaft in which a base end portion of a long belt-like webbing belt is locked so as to be retractable;
A lock bar that protrudes toward the seat back and is fixed to the vehicle body;
It is provided on the seat back corresponding to the lock bar, and is movable between the first position and the second position, and is urged from the second position side to the first position side by the urging means. A latch member engaged with the lock bar by moving to the first position at a predetermined tilt position of the seat back with respect to the seat cushion;
Provided on the seat back, moved together with the latch member when the latch member moves from the first position to the second position, and moved when the subsequent latch member engages with the lock bar A trigger member held in engagement with the lock bar in position;
It is connected to the trigger member via a wire, and engages with the winding mechanism in a normal state to prevent the winding shaft from rotating, and the trigger member is engaged and held by the lock bar and the latch member A rotation preventing mechanism that releases the engaged state with the winding mechanism by moving to the first position;
A webbing take-up device comprising: A lock bar that protrudes toward the seat back and can be tilted with respect to the seat cushion,
A latch member provided in the seat back corresponding to the lock bar, biased in a predetermined direction by a biasing means, and engaged with the lock bar by moving in the predetermined direction;
The seat back is disposed in the seat back in a state of facing the lock bar in the tilt direction of the seat back and preventing the latch member from moving in the predetermined direction, and the seat back at the predetermined tilt position of the seat back with respect to the seat cushion. A trigger member that releases the movement blocking state of the latch member by being pressed by a lock bar;
A wire connected to the latch member and pulled by movement of the latch member in the predetermined direction;
A latch detection device comprising: A lock bar that protrudes toward the seat back and can be tilted with respect to the seat cushion,
It is provided on the seat back corresponding to the lock bar, and is movable between the first position and the second position, and is urged from the second position side to the first position side by the urging means. A latch member engaged with the lock bar by moving to the first position at a predetermined tilt position of the seat back with respect to the seat cushion;
Provided on the seat back, moved together with the latch member when the latch member moves from the first position to the second position, and moved when the subsequent latch member engages with the lock bar A trigger member held in engagement with the lock bar in position;
A wire connected to the trigger member, in which the trigger member is held in engagement by the lock bar and the latch member is moved to the first position to be pulled by a predetermined length or more;
A latch detection device comprising:

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