ELECTROMAGNETICALLY CONTROLLED SAFETY BELT RETRACTOR

摘要

A reel type retractor for a safety belt having the feature that an electromagnet, normally activated, and holding a cam member by virtue of an armature attached thereto, maintains a pawl out of latching engagement with the reel, thereby permitting free extension of the belt. Any interruption of the current to the electromagnet permits the reel to rotate the cam, releasing a cam follower attached to the pawl bar, and allowing the biased pawl bar to rotate into locking engagement with the reel. Current interruption can be effected by the opening of a pressure switch responsive to the hydraulic pressure in a vehicle's braking system, by the opening of an inertial switch responsive to a change in velocity of the vehicle to which the switch is attached or by both types of switches working in series.