Document Type and Number:
Japanese Patent JPS5245373
Kind Code:
B2
Abstract:
A retractor for seat belt harness and the like which responds to lock inertially on accelerated withdrawal of harness material such as belting. The inertial lock-up is the consequence of matched rotary ratchets, one comprising the flange of the storage drum and the other responsive to inertial differences in the rate of harness withdrawal and the two extremes of relative movement are from matched or synchronized ratchet registry and mis-matched or out-of-phase relation in respect to the ratchet teeth. A pawl element is provided and is biased toward blocking rotation of the spool and is barred from locking the ratchet when the out-of-phase condition exists between ratchets since the teeth crest in one ratchet bars access to the gap between teeth in the other ratchet. When match registry of teeth occurs as a consequence of the spool leading the inertial match plate or ratchet wheel, then the pawl can see the opening between teeth and lock the ratchets against further movement. A spring bias provides a resilient drive cushion as between spool and match plate and the spring bias acts to hold the ratchet elements and match plate in normal out-of-phase relation. The limits of arcuate movement between ratchet flange and match plate are to match position on one extreme of travel and full mis-match at the other position of travel. A disabling sensor is positioned to prevent the pawl element from engaging the ratchet elements until a predetermined amount of harness material has been withdrawn from the spool. A retractor motor is secured to the frame journalling the spool and is drivably secured to the spool applying a relatively constant return bias to the harness material unimpeded by the ratchet and pawl elements.
Application Number:
JP12830272A
Publication Date:
November 15, 1977
Filing Date:
December 22, 1972
Export Citation:
International Classes:
B60R22/38; B64D25/06