Webbing retractor
AssigneeKabushhiki Kaisha Tokai-Rika-Denki-Seisakusho
InventorsShigeyasu Kanada, Shigeo Mizuno, Yoshio Nakano
Life of this patent
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Abstract
In a webbing retractor, a webbing takeup shaft is coupled on to a worm wheel through resilient means and a worm engaged with the worm wheel is connected to a drive means, whereby a biasing force of the resilient means is adjusted to decrease a webbing tension acting upon an occupant by a rotation of the drive means.
Claims20
A webbing retractor adapted for use in a seatbelt system for protecting an occupant in an emergency situation of a vehicle, which comprises:
- (a) a takeup shaft retracting one end of an occupant restraining webbing thereon;
- (b) first resilient means, one end thereof being secured to the takeup shaft, biasing the takeup shaft in a direction of retraction of the webbing;
- (c) a worm wheel, the other end of the resilient means being secured thereto, adjusting a biasing force of the first resilient means;
- (d) a worm engaged with the worm wheel and movable in an axial direction of the worm by a predetermined amount;
- (e) drive means rotatively driving the worm;
- and
- (f) control means detecting a movement amount of the axial direction of the worm and controlling the drive means to rotate the worm wheel through the worm, whereby a tension of the webbing is adjusted in its suitable situation.
A webbing retractor adapted for use in a seatbelt system for protecting an occupant in an emergency situation of a vehicle, which comprises:
- (a) a frame fixed to a vehicle body;
- (b) a takeup shaft journalled on to the frame and retracting one end of an occupant restraining webbing thereon;
- (c) first resilient means, one end thereof being secured to the takeup shaft, biasing the takeup shaft in a direction of retraction of the webbing;
- (d) a worm wheel rotatably supported to the takeup shaft and secured with the other end of the first resilient means to adjust a biasing force of the first resilient means;
- (e) a worm supported on the frame movably in an axial direction of the worm by a predetermined amount and engaged with the worm wheel;
- (f) drive means rotating the worm wheel through the worm;
- (g) second resilient means supported on the frame coaxially with the worm and biasing the worm wheel in a direction of increase of the biasing force of the first resilient means through the worm;
- and
- (h) control means detecting a movement amount of the axial direction of the worm and controlling the drive means to rotate the worm wheel through the worm, whereby a tension of the webbing is adjusted in its suitable situation.
Dependencies are inferred from the claim text.