improvement in repo to block emergency for safety belts for vehicles

摘要

An emergency locking safety belt retractor having a safety belt wound upon a reel has a dual tension single spring retraction means including reduction gear means interposed between the reel and retractor spring which is selectively operated to reduce the force of the spring means upon the reel when the safety belt is protracted to a position of use and then slightly retracted for a limited amount of retraction movement during which the safety belt is in a "low tension zone" condition until the limited retraction movement allowed is exceeded and the full force of the spring is reapplied through the gear means to the reel.