Lock mechanism for webbing retractor

Details Lock mechanism for webbing retractor Lock mechanism for webbing retractor

1986-03-27

1987-08-18

Levy, Stuart S.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

2421074B, A62B 3502, B65H 7548

Patent

active

046871560

ABSTRACT:
A lock mechanism for a webbing retractor employed in a seatbelt system for a vehicle designed to protect an occupant in an emergency situation of the vehicle. A ratchet wheel is provided coaxially with a lock ring adapted for stopping, when an emergency situation of the vehicle occurs, the rotation of a webbing take-up shaft in a direction in which the webbing is unwound. A lever which is activated by the action of an acceleration sensor is engageable with both the ratchet wheel and the lock ring. The rotation of the take-up shaft is transmitted to the ratchet wheel through friction. When the vehicle is in a normal state, the ratchet wheel is rotatable together with the take-up shaft and gives no resistance to the rotation of the take-up shaft. When the webbing is wound up in a state wherein the lever is engaged with the lock ring, the ratchet wheel pushes out the lever so as to disengage from the lock ring. Accordingly, it is possible to prevent the webbing from being undesirably wound up and tightened when the vehicle is running on a rough road.

REFERENCES:
patent: 4438551 (1984-03-01), Imai
patent: 4467981 (1984-08-01), Mori et al.
patent: 4483495 (1984-11-01), Honi
patent: 4573646 (1986-03-01), Willey

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