Patent ID: 9302647
Filing Date: 2016-04-05
CPC Classification: B60R

Claim Text:
1. A locking unit for a seat belt retractor, which locking unit is provided at one end of a seat belt spool of the seat belt retractor, on which a seat belt is retracted, so that when the seat belt is quickly unrolled a locking arm of a locking lever is locked with an internal gearwheel fixed to prevent rotation, as a result of which the seat belt spool is locked, wherein the locking unit comprises: the locking lever with a centre of rotation arranged spaced apart from the centre of the seat belt spool, an actuator arm and the locking arm; a triggering unit having an inertia weight, a counter-pressure spring and a transmission arm, which engages with the actuator arm, wherein the triggering unit is formed to rotate the locking lever about the centre of rotation and to lock the locking arm with the fixed internal gearwheel that is arranged about the locking lever in the case of a fast acceleration of the unrolling of the seat belt, conditioned by the inertia force of the inertia weight acting against the spring force of the counter-pressure spring, wherein a cover ring having a flange, an upstanding wall extending from the flange and a central opening is provided between the locking lever and the internal gearwheel, which cover ring is rotated into a covering position when the seat belt is retracted, in which covering position the cover ring at least partially covers the region between the locking arm and the internal gearwheel in order to prevent locking, and rotated into a release position when the seat belt is unrolled, in which release position the cover ring releases the region between the locking arm and the internal gearwheel in order to permit locking, a notch formed in the upstanding wall, wherein the locking lever is within the central opening of the cover ring, and the teeth of the locking arm extend through the notch in the upstanding wall.