A coupling element (32) which is movable between a coupling position in which the coupling element couples the belt reel (12) to the damping means (22) and an idle position in which the coupling element (32) is disconnected from the belt reel (12) is provided on a belt retractor (10) comprising a belt reel (12) which is mounted in a housing (14) and onto which webbing of a seat belt can be wound and comprising a damping means (22) adapted to dampen the winding rotation of the belt reel (12) in a defined end portion.

A self-locking belt retractor comprising a belt shaft which is rotatably mounted in a frame, wherein a safety belt can be wound up said belt shaft, a blocking device which blocks the belt shaft if a predetermined feed-out acceleration of the safety belt in the feed-out direction of the safety belt is exceeded, and comprising a control disc device mounted on the belt shaft, the control disc device comprising a control disc and an inert mass which is mounted on the control disc so as to be pivotable about a pivot axis.

When end lock has occurred in a seat belt retractor due to winding-up of a webbing, the end lock is easily and surely released. A stop part (6G) engages with a lock arm (40) displaced in a locking operation direction and stops the lock arm (40). A lock mechanism (9), in a state where the lock arm (40) stands still on the stop part (6G), starts operation with rotation in a pull-out direction (P) of a winding drum and stops rotation of the winding drum. A transmission mechanism (19) transmits rotation of the winding drum to the lock arm (40) and displaces the lock arm (40) in a release direction to release the engagement with the stop part (6G) is released between the time when operation of the lock mechanism (9) is started and the time when rotation of the winding drum is stopped. Release means (18) releases the engagement between the lock arm (40) and the stop part (6G) by the transmission mechanism (19).

A prelock prevention device for use with a web retractor in a vehicle restraint system is described herein. The web retractor can include a sidewall adjacent a rotatable spool with a web wound thereon. A prelock prevention device configured in accordance with aspects of the present technology can include a base having a first flange portion spaced apart from a second flange portion to define a space therebetween. At least one of the first flange portion or the second flange portion is resiliently biased toward the other of the first flange portion or the second flange portion to grip an edge portion of the retractor sidewall sandwiched therebetween. The prelock prevention can further include an arm resiliently supported by the base and having a contact surface configured to compress the web against the spool during rotation thereof to reduce web retraction velocity.

A seat belt retractor that functions to cancel both a function of a vehicle sensor and a function of a webbing sensor on a predetermined condition with a simple structure and a small number of components. When a seat belt is fully retracted, a cam follower of a first lever comes into contact with a second cam portion of a cam plate. An actuator pressing portion of the first lever presses an actuator of a vehicle sensor to a non-operation position. The function of the vehicle sensor is thereby cancelled. Further, when an engaging claw of a second lever separates from a ratchet tooth of a ring gear, the ring gear is allowed to rotate in a seat belt withdrawing direction. Therefore, the function of the webbing sensor is cancelled.