Patent ID: 7770836
Filing Date: 2010-08-10
Classification: B60R

Abstract:
1. A locking unit for a seat belt retractor which is provided on one end of a spool, around which a belt is wound, such that, when the belt is rapidly unwound, a locking part of a locking arm, which is disposed away from a center of the spool in a predetermined distance, is locked to an internal gear, thus locking the belt, the locking unit comprising: the locking arm provided with the locking part on a first end thereof and with a locking protrusion on a second end thereof, wherein the locking arm is pivotally mounted on the spool; a central gear provided on the center of the spool, the central gear being stationary, and an actuating gear rotatably mounted on the spool and engaging with the central gear so that the actuating gear is rotated around the central gear by rotation of the spool and is rotated around a center thereof; and locking pin parts provided on a rotating shaft of the actuating gear and selectively restricting rotation of the locking protrusion such that a constant frictional force is maintained between the locking pin parts and the actuating gear, and the actuating gear and the locking pin parts stop the locking protrusion when the belt is retracted, thus preventing the locking of the belt.