Abstract: In a locking mechanism for a webbing retractor in which a plurality of lock plates rotated together with a takeup shaft winding an occupant-restraining webbing are moved in tangential directions of the takeup shaft in an emergency situation of a vehicle and teeth portions of the lock plates come into mesh with an internal gear ratchet wheel, whereby a webbing-unwinding rotation of the takeup shaft is stopped, the teeth portion of one of the lock plates is disposed nearer to the internal gear ratchet wheel than the teeth portion of the other lock plate, so that the teeth portion of the one of the lock plates comes into mesh with the internal gear ratchet wheel earlier than the teeth portion of the other lock plate.

Abstract: An acceleration of a vehicle is detected, whereby a movable body tilts a lever, which in turn tilts a pawl to stop a lock ring in rotation, so that a takeup shaft can be stopped in a direction of webbing unwinding rotation.When the angle at which the movable body is mounted to a frame rotatably supporting the takeup shaft is changed, members of transmitting means between the lever and the pawl slide on each other, to thereby prevent the lever from being tilted, so that webbing unwinding can be reliably stopped in an emergency situation of the vehicle in the same manner as before even after the angle at which the movable body is mounted to the frame is changed.

Abstract: A seatbelt retractor wherein the wind-out operation of a webbing to be wound up by a take-up shaft is adapted to be locked through the operation of an acceleration sensor in an emergency of a vehicle. Furthermore, the seatbelt retractor comprises a vibration sensor for sensing the vibrations caused to the vehicle and a frictional clutch mechanism to be operated by a vibration sensor for braking the wind-up operation of the webbing.

Abstract: An occupant retaining webbing is wound up to a take-up shaft supported on a frame, a ratchet wheel is secured to said take-up shaft, and a pawl tiltingly movably supported on the frame and is engaged with the ratchet wheel to thereby stop wind-out of the webbing. Said take-up shaft pivotally supports a working plate which guides a balancer provided thereon with a pair of pawls, and due to the operation of an acceleration detector either one of the pawls is engaged with the ratchet wheel, whereby the working plate tilts the pawl to be engaged with the ratchet wheel.

Abstract: A webbing retractor in a safety seatbelt system, wherein the webbing is wound up by a take-up shaft through a biasing force and wherein the retractor is provided with a sensor for sensing the vibrations of the vehicle and a locking device actuated by the sensor to prevent the windup force of the take-up shaft from being applied to the webbing whereby pleasant fitness is obtained when the vehicle runs on a bad road.