Abstract: A buckle assembly for a seat belt generally comprises a base having a horizontal plate and side plates, a latch means to be engaged with the side plates and supported thereby so as to be swingable between a latch locking position and a latch releasing position, a push button pivotally mounted to the side plates, a spring means to be engaged with the latch means so as to always urge the latch means towards the locking position thereof, and a tongue means to be inserted into a tongue insertion space formed between the horizontal plate and the side plates of the base and engaged with the latch means.

Abstract: A seat belt buckle assembly, for quick release engagement with a mating tongue, has a latch mounted on a base for pivotal motion between a latching position, where the latch engages the tongue against withdrawal from the buckle assembly, and an unlatching position where the latch releases the tongue. A push button is also pivotally mounted on the base in an overlying relation to the latch. Interposed between the latch and the push button is a dual purpose spring capable of acting on both latch and push button for biasing the latch from the unlatching toward the latching position, and the push button away from the latch. For causing the latch to release the tongue, the push button is to be pushed manually against the force of the dual purpose spring, whereupon the push button acts directly on the latch for pivoting the same from the latching to the unlatching position against the force of the dual purpose spring.

Abstract: A retractor sensitive both to a rate of webbing withdrawal and to vehicle acceleration is disclosed. A reel for paying off and winding up the webbing is fixedly mounted on a rotary shaft sprung in a direction of webbing retraction. Mounted on an extension of the reel shaft is a locking mechanism including a locking ring which is cammed axially of the reel shaft extension for locking and unlocking the reel. A webbing sensor mechanism comprises a cam disc rotatably mounted on the reel shaft extension and normally engaged with the locking ring for joint rotation therewith, and an inertia member in the form of a heavy ratchet wheel also rotatably mounted on the reel shaft extension. The cam disc has eccentrically pivoted thereon a curved sensor arm which, upon rapid webbing extension, is pivoted by the ratchet wheel into engagement with one of ratchet teeth formed internally on a fixed housing.

Abstract: When a tongue having a locking hole is inserted into a buckle, the edge of the locking hole is caught and locked by a catch of a rockable latch plate and is unlocked thereby when a slide button of the buckle is manually pressed in sliding movement, in which an inclined surface of the button actuates by wedge action lever-like arms of an actuating plate which, in turn, force a rockable link plate to rotate the latch plate until its catch releases the tongue. A number of springs are provided for return movements including a spring cocked by the inserted tongue for forcibly ejecting the tongue when it is released.