B - Operations – Transporting – 60 – R
Patent
B - Operations, Transporting
60
R
242/43.6
B60R 22/44 (2006.01)
Patent
CA 1044679
BELT RETRACTOR WITH WINDING PREVENTION AND MEMORY MECHANISM Abstract of the Disclosure A seat belt retractor according to the invention has a conventional inertia locking mechanism which permits the occu- pant to lean forwardly in the seat by unwinding belt from a reel which is biased in the winding direction by a winding spring. In accordance with the specific embodiment described, a winding pre- vention mechanism includes a toothed ratchet plate connected to the reel and a pawl movably mounted on the housing for movement to a detenting position engaging the ratchet teeth to block belt winding reel rotation and thereby hold the belt extended at a slackened condition about the occupant. The pawl is also movable to an undetenting position, and a further undetenting position. A control disc has a peripheral edge including a notch allowing movement of the pawl to detenting position and a cam surface spaced circumferentially from the notch for engaging and moving the pawl to the further undetenting position. The control disc is frictionally clutched to the reel for rotation therewith be- tween one limit aligning the notch with the pawl and another limit in which the pawl is engaged by the cam surface in response to belt unwinding rotation. A blocking disc is also friction- ally clutched for rotation with the reel and has a notch which receives the pawl to capture and hold the pawl in the further undetenting position in response to initiation of belt winding reel rotation subsequent to belt unwinding rotation and movement of the pawl to the further undetenting position by the cam sur- face. Subsequent initiation of belt unwinding rotation rotates the blocking disc to release the pawl member from the further undetenting position to the detenting position. The control -1- disc also has a control surface which extends circumferentially between the notch and the cam surface for holding the pawl in the undetenting position during belt winding reel rotation subsequent to belt unwinding reel rotation which is insufficient to cause the cam surface to move the pawl to the further undetenting posi- tion. The control surface defines a range of unwinding movement of the belt which is permitted without moving the pawl to the further undetenting position so that the belt will be rewound on the reel until the notch is again aligned with the pawl to allow return of the pawl to the detenting position so that the ex- tended length of slackened relation of the belt about the occu- pant is remembered and restored.
246595
General Motors Corporation
Na
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