Abstract: In a webbing take-up device, a FL lock pawl is actuated by rotation of a spool in a pull-out direction relative to a lock base, coupling the spool and a lock ring of an energy absorption mechanism together by the FL lock pawl. A reduction in number of times the FL lock pawl is actuated is thereby enabled in comparison to a case in which the FL lock pawl always actuates on actuation of a lock mechanism. The occurrence of wear or the like of ratchet teeth of the FL lock pawl is suppressed as a result. Accordingly, improvement of margin for durability of the FL lock pawl that actuates the energy absorption mechanism is enabled.

Abstract: A length direction base end side of a wire passes through a retaining spring mounting hole formed in a case, and is anchored to an anchor tag that is indirectly retained by a pulley. A spring is provided in the retaining spring mounting hole, and a base end of a tube is retained to the spring through a metal cylinder body. A spring-side step portion of the spring is pressed contact to a mounting portion-side step portion of the retaining spring mounting hole so the spring is retained. When the tube is pulled towards an opening side of the retaining spring mounting hole, the spring moves and the spring-side step portion makes press contact with, and is once again retained, by a different step of the mounting portion-side step portion.

Abstract: A webbing retractor includes a retracting shaft; a lock member regulating the rotation of the retracting shaft in the pulled-out direction; a rotating body connected to the retracting shaft; a rotation detecting member that is relatively displaced with respect to the rotating body by inertial force, by which rotation of the rotating body in the pulled-out direction is regulated, and by which the lock member is actuated; and a regulating member having an engaging portion that engages with the rotation detecting member because of the rotation of the rotating body in the retraction direction. The engagement of the engaging portion with the rotation detecting member is released as the engaging portion is displaced toward a radial direction inside of the rotating body by the rotation of the rotating body in the pulled-out direction.

Abstract: In an acceleration sensor, a guide portion is formed on a swing push-us member contiguous to a pushing portion and further to a pull-out direction side than the pushing portion. A top-edge portion of the guide portion is sloped to gradually get lower on progression away from the pushing portion in the pull-out direction. When a coupling claw moves in the take-up direction together with the sensor gear, the guide portion contacts the coupling claw from below the leading end of the coupling claw. The guide portion swings the coupling claw upwards as the sensor gear is rotating in the take-up direction, and guides the coupling claw to be on the pushing portion. The swing push-us member can be prevented from unintentionally obstructing the coupling claw when the sensor gear is returning to the initial position, even without provision of structure to restrict the swing push-us member from rising.

Abstract: In a webbing take-up device, a cut-out portion is formed in a close-off portion that closes off a pawl housing groove from a side opposite a spool body side. For this reason, the close-off portion is not formed in a position facing ratchet teeth which is at from a second ratchet tooth from a take-up direction side to the other side. Due to this, even if a head portion of a lock pawl, particularly a take-up direction side portion of the head portion, is displaced in such a way as to move away from the spool body, the head portion does not come into contact with the close-off portion or, even if the head portion comes into contact with the close-off portion, a force with which the head portion presses the close-off portion becomes smaller.

Abstract: In a webbing take-up device, an open portion is formed in the other side, in a direction about a rotational axis of a switch pawl, of a sensor holder. In a state where an engagement piece is positioned on the outside of the open portion, the switch pawl is rotated about a shaft to cause the engagement piece to enter in a window portion, so, a distal end of the engagement piece, bent in a hook shape, faces to a regulation wall in an axial direction of the shaft. It is not necessary to elastically deform the engagement piece when bringing the regulation wall and the engagement piece into facing. Therefore, the engagement allowance in the engagement piece with the regulation wall can be enlarged and the distal end of the engagement piece can be prevented from crossing over the regulation wall and moving toward the shaft side.

Abstract: The present invention provides a webbing take-up device that can effectively suppress tilt of a rotation body when an actuation member has been actuated. In a webbing take-up device, tilt restricting portions are provided at a V gear. The tilt restricting portions are provided at a radial direction inner side than a place of engagement between a W pawl and ratchet teeth of a sensor holder and project further toward a sensor holder side than an end surface at the sensor holder side, which end surface is at the outer side in the radial direction than the place of engagement. For this reason, tilt of the V gear with respect to its axial direction can be restricted.

Abstract: A webbing take-up device comprising a spool and a locking unit having a locking unit main body having a rotational acceleration detecting unit, wherein the rotational acceleration detecting unit comprises a second rotating body; a rotation transmission member provided at the second rotating body; an inertial mass body having a pressing portion and provided at the second rotating body; a biasing means provided at the second rotating body; and a retaining portion provided at the second rotating body to pinch the rotation transmission member together with the inertial mass body biased by the biasing means, thereby retaining the rotation transmission member in a state in which the rotation transmission member does not engage with the first rotating body, and to release retention of the rotation transmission member when relative rotation is produced between the second rotating body and the inertial mass body.

Abstract: Provided is a webbing winding device having a lock mechanism in which a driven body is less influenced by an inclination of a driving body. A peripheral wall extends from an edge portion of a penetration hole formed at a sensor gear constituting the lock mechanism toward a link member, and a guide hole is formed at a bottom wall formed at the front end of the peripheral wall. An engagement pin of the link member passes through the guide hole from the base end portion rather than the front end portion thereof in the protruding direction. Further, in the front end side of the engagement pin passing through and protruding from the guide hole, the outer peripheral portion is spaced apart from the inner peripheral portion of the peripheral wall.

Abstract: If a V-gear abruptly rotates in a pulled-out direction due to reaction generated by rotation in a take-up direction being stopped when rotating in a take-up direction, a restriction body restricts swinging of a W-pawl in operation direction, so that lock of pulling-out of a webbing from a spool is suppressed. An insertion portion of a frictional spring of the restriction body is caught by an abut portion and a catching portion of a support hole. At an opening-side portion of the support hole, an enlarged portion is formed such that a position other than a position of the catching portion at the opening-side portion is enlarged compared to that of the catching portion. Even if the minimum-diameter of the support hole is small, strength of a molding portion for the support hole in a mold for the V-gear can be improved and lifetime thereof can be longer.

Abstract: A shaft portion formed at a vertical wall of a sensor housing is formed in a circular column shape, and an abut portion is formed facing a support wall, below the shaft portion. A width dimension of the abut portion is the same as the diameter dimension of the shaft portion as seen in plan view, and the abut portion is formed so as to overlap entirely with the shaft portion as seen from the opposite side of the shaft portion to the abut portion. Foreign objects such as dirt or dust that fall onto the circular column shaped shaft portion therefore readily slide over the shaft portion and fall down from the shaft portion, and foreign objects such as dirt or dust do not stay on the abut portion.

Abstract: In a placement face of which a general face is configured with a circular cone shape, restriction faces are formed. When a sensor ball rolls along an axial direction of rotating shafts, the sensor ball accordingly contacts one of the restriction faces or another of the restriction faces. From this state, in order for the sensor ball to roll further along the axial direction of the rotating shafts, the sensor ball has to rise up the one of the restriction faces or the other of the restriction faces that respectively have a larger angle of incline than the general face. By contrast, in order for the sensor ball to roll in directions orthogonal to the axial direction of the rotating shafts as seen in plan view, the sensor ball only has to roll over the general face.

Abstract: In an insertion hole formed in an adapter, a side wall which presses an insertion piece of a stopper with an urging force of a spiral spring has a wall surface parallel to a virtual straight line passing a center of the adapter and positioned on the virtual straight line. Thus, a direction which the wall surface of the side wall presses the insertion piece of the stopper is along a facing direction which the side wall and another side wall face each other, and is not inclined outward in a radial direction of the adapter with respect to the facing direction. Thereby, a pressing force applied from the wall surface of the side wall to the insertion piece of the stopper does not cause the insertion piece to be extruded from the insertion hole. Thus, insertion state of the insertion piece to the insertion hole can be satisfactorily maintained.

Abstract: A webbing take-up device is provided capable of preventing or suppressing a frame from deforming such that one of leg-plates or a back-plate displaces towards the other. A face on the center of curvature side of a curved portion of a front back plate section configuring the frame and a one width direction edge namely an upper edge of a bar support face each other along the up-low direction. When the front edge sides of leg-plates are displaced to rise due to a webbing being pulled, the one width direction edge of the bar support interferes with a front end of the front back plate section to prevent or suppress the front edge sides of the leg-plates from rising further. Deformation of the frame caused by the front edge sides of the leg-plates to rise can accordingly be prevented or suppressed.

Abstract: In an acceleration sensor, a guide portion is formed on a swing push-us member contiguous to a pushing portion and further to a pull-out direction side than the pushing portion. A top-edge portion of the guide portion is sloped to gradually get lower on progression away from the pushing portion in the pull-out direction. When a coupling claw moves in the take-up direction together with the sensor gear, the guide portion contacts the coupling claw from below the leading end of the coupling claw. The guide portion swings the coupling claw upwards as the sensor gear is rotating in the take-up direction, and guides the coupling claw to be on the pushing portion. The swing push-us member can be prevented from unintentionally obstructing the coupling claw when the sensor gear is returning to the initial position, even without provision of structure to restrict the swing push-us member from rising.

Abstract: A webbing take-up device including: a take-up shaft on which a webbing is taken up; a lock mechanism including a lock gear disposed at one axial direction end portion of the take-up shaft and formed with ratchet teeth, and a lock plate formed with lock teeth engaging with the ratchet teeth; and a frame including a pair of leg plates disposed at both axial direction end portions of the take-up shaft, an opening portion being formed at a leg plate of the pair of leg plates disposed further to the other axial direction end portion of the take-up shaft than the ratchet teeth and the lock teeth, and the opening portion passing through the leg plate at a position that faces towards a range including a mutual engagement position between the ratchet teeth and the lock teeth and the periphery of the engagement position along the take-up shaft axial direction.

Abstract: In a webbing winder, when a webbing belt is wound around a spool, a V gear is rotated in a winding direction together with a W pawl, a friction spring, and a contact member, thereby generating a frictional force between the contact member and a sensor holder. As a consequence, the friction spring and the contact member are located at a restriction position, so that the friction spring engages with an engaging surface of the W pawl. Therefore, even if the spool and the V gear are rapidly and slightly rotated in a withdrawal direction in reaction when the webbing belt is completely wound by the spool, the W pawl cannot mesh with a ratchet gear formed at the sensor holder due to the restriction of oscillation of the W pawl, thus preventing any end lock.

Abstract: In an insertion hole formed in an adapter, a side wall which presses an insertion piece of a stopper with an urging force of a spiral spring has a wall surface parallel to a virtual straight line passing a center of the adapter and positioned on the virtual straight line. Thus, a direction which the wall surface of the side wall presses the insertion piece of the stopper is along a facing direction which the side wall and another side wall face each other, and is not inclined outward in a radial direction of the adapter with respect to the facing direction. Thereby, a pressing force applied from the wall surface of the side wall to the insertion piece of the stopper does not cause the insertion piece to be extruded from the insertion hole. Thus, insertion state of the insertion piece to the insertion hole can be satisfactorily maintained.

Abstract: In a webbing retractor, when a V gear has been rotated in a withdrawal direction following a spool and a W pawl has been relatively displaced with respect to the V gear by inertial force, the rotation of the V gear is regulated and a lock plate regulates the rotation of the spool. A first center-of-gravity adjusting hole and a second center-of-gravity adjusting hole are disposed in the W pawl, and the sensitivity of detecting the inertial force is adjusted as a result of a center-of-gravity position of the W pawl being adjusted. The first center-of-gravity adjusting hole and the second center-of-gravity adjusting hole are disposed away from an outer peripheral surface of the W pawl, so the center-of-gravity position of the W pawl becomes adjustable without having to change the outer peripheral shape of the W pawl.

Abstract: A webbing retractor includes a retracting shaft; a lock member regulating the rotation of the retracting shaft in the pulled-out direction; a rotating body connected to the retracting shaft; a rotation detecting member that is relatively displaced with respect to the rotating body by inertial force, by which rotation of the rotating body in the pulled-out direction is regulated, and by which the lock member is actuated; and a regulating member having an engaging portion that engages with the rotation detecting member because of the rotation of the rotating body in the retraction direction.