A seatbelt retractor for a seat belt device in a vehicle. The retractor includes a frame and a spool configured to be fixed to one end of a seat belt webbing so that the webbing may be wound around the spool. The spool is rotatably mounted at both ends to the frame and configured to rotate in a webbing extraction direction and a webbing retraction direction. The retractor includes primary and secondary torsion bars positioned end to end in the spool along an axis of rotation of the spool. The primary and secondary torsion bars are configured to be locked at second ends of the torsion bars opposite to the first end. The first ends of the torsion bars are configured to rotate relative to the second ends so that the primary and secondary torsion bars deform to absorb force when a vehicle acceleration exceeds a predetermined value.

A seat belt retractor that has a simple structure, easy to manufacture and operates accurately is provided, and a seat belt apparatus provided with the seat belt retractor is also provided. The seat belt retractor includes energy absorbing mechanisms that absorb and alleviate the energy of a vehicle occupant by limiting a load applied to a seat belt. The energy absorbing mechanisms is coaxially incorporated in a spool, whose one end portion is retained by the spool and the other end can be locked by the lock mechanism, and obtains a rotational force when being twisted. The second energy absorbing mechanism includes a first rotating member rotatable together with the spool, an abutting member relatively rotatable with respect to the first rotating member by a predetermined angle, a second rotating member relatively rotatable with respect to the abutting member, and an energy absorbing member whose one end portion is fixed to and supported by the second rotating member and the other end portion abuts against the abutting member.

A seat belt retractor including a spool and a measurement mechanism for determining a measure of the amount of seat belt webbing unwound from the spool. The measurement mechanism includes cycloidal gear transmission. A sensor is provided for detecting movement of a magnet mounted on a sensing gear and a controller may be provided for determining a measure indicating the amount of rotation of the spool and the amount of webbing withdrawal based on the movement of the magnet.

A seat belt retractor for a seat belt includes a spool for winding the seatbelt, a first seat belt load limiting mechanism for limiting load applied on the seat belt in an emergency, a second seat belt load limiting mechanism for limiting the load applied to the seat belt when a predetermined condition based on an emergency situation is satisfied in the emergency, a driving member for actuating the second seat belt load limiting mechanism, and a controller for controlling the driving member. When the predetermined condition is satisfied, the controller sets the second seat belt load limiting mechanism in an operative state by not actuating the driving member. When the predetermined condition is not satisfied, the controller sets the second seat belt load limiting mechanism in an inoperative state by actuating the driving member.

The invention relates to a belt retractor comprising a frame (10), a belt reel (12) rotatably arranged within the frame (10), a blocking mechanism (18) by which the belt reel (12) can be blocked within the frame (10), and a load limiter which comprises a corrugated disk (36), characterized in that the corrugated disk (36) is disposed between the belt reel (12) and a cover (38) which is laterally attached to the belt reel (12).

The invention relates to a belt retractor comprising a frame (10), a belt reel (12) rotatably arranged within the frame, a blocking mechanism (18) by which the belt reel (12) can be blocked within the frame (10), and a load limiter (14) which is detachably coupled to the belt reel (12), characterized in that for coupling the load limiter (14) at least one load-transmitting bar (28) is used which is arranged at the belt reel (12) and is retained in a coupling position by a support ring (32), wherein the support ring (32) can be moved from a supporting position to a release position by means of an actor (70).

In a webbing take-up device, when a pre-tensioner is actuated and a spool then rotates in a pull-out direction in a state in which an engagement tooth of a restricting pawl has meshed with external teeth of a gear plate, the restricting pawl swings together with the gear plate. This suppresses release of the meshing between the engagement tooth of the restricting pawl and the external teeth of the gear plate. This thereby enables inertial force of a flywheel to be transmitted to the spool, irrespective of the rotational acceleration of the flywheel or the magnitude of a rotation speed of the flywheel.

For a vehicle seat, for instance an aircraft passenger seat, a seat belt system including a seat belt reel having a rotating shaft, a seat belt wound on the rotating shaft, and a lock for locking at least one of the rotating shaft and the seat belt. At least one sensor is operative to output a signal when a sensed parameter exceeds a predetermined magnitude threshold. An activation device is operative to activate the lock. A time delay device electrically coupled to the at least one sensor and the activation device is operative to, upon receiving the signal output by the at least one sensor, activate the activation device upon completion of a time delay after receiving the signal output by the at least one sensor. Further embodiments include shoulder belts forming loops allowing a predetermined amount of forward travel prior to restraining a passenger.

The present invention relates to a safety belt retractor, comprising a frame (1), a belt reel (3), which is rotatably supported in the frame (1) and is configured for winding a webbing (2), a force-limiting member (4), which fails when a predetermined load threshold is exceeded, and a pretensioner (10) having a drive wheel (6) coupled with the belt reel (3) via the force-limiting member (4), wherein the drive wheel is drivable to rotate the belt reel (3) in a winding direction of the webbing, so as to pretension the webbing. The drive wheel (6) is directly rotation-fixedly connected with the force-limiting member (4) at a first side facing the belt reel (3), wherein the drive wheel (6) is rotatably supported relative to the belt reel (3) except for a rotation-fixed connection. The safety belt retractor further comprises a lockable stop wheel (9), wherein the drive wheel (6) is directly rotation-fixedly connected with the stop wheel (9) at a second side facing away from the belt reel (3). The safety belt retractor has a compact structure and a stable force-limiting function.

A three-point seatbelt device includes: a webbing configured to function as a shoulder belt and a lap belt; a shoulder-side reeler that includes a pre-tensioner mechanism and a shoulder-side force limiter mechanism, and is configured to reel up an end portion of the webbing on a shoulder belt side so as to allow the webbing to be pulled out; a tongue mounted on the webbing; and an inner belt including a buckle to which the tongue is coupled, the inner belt including, of a pre-tensioner mechanism and a buckle-side force limiter mechanism, only the buckle-side force limiter mechanism. An initial load of the buckle-side force limiter mechanism is set to be larger than an initial load of the shoulder-side force limiter mechanism.