Webbing tension device
AssigneeKabushiki Kaisha Toka-rika-denki-seisakusho
InventorTeruhiko Kawaguchi
Life of this patent
Estimating the term…
Abstract
In a webbing tension device for imparting a tension to an occupant restraining webbing in an emergency situation of a vehicle, large biasing means for biasing a webbing takeup shaft in a webbing winding direction in the emergency situation of the vehicle is wound up by such winding-up drive means as a motor through reduction means and clutch means is disposed between the large biasing means and the reduction means. Accordingly, a rotation force of the winding-up drive means is transmitted to the large biasing means only when the large biasing means is wound up by the winding-up drive means.
Claims20
A webbing tension device for imparting tension to an occupant restraining webbing during an emergency situation of a vehicle, which comprises:
- (a) a first biasing means for biasing a webbing takeup shaft in a web winding direction in an emergency vehicular situation;
- (b) a first clutch means disposed between the takeup shaft and the first biasing means for transmitting the biasing force of the first biasing means to the takeup shaft in the emergency vehicular situation;
- (c) a winding-up drive means for winding up the first biasing means after the biasing force of the first biasing means is spent in the emergency vehicular situation;
- (d) a reduction means for reducing the winding-up motion of the winding-up drive means;
- and
- (e) a second clutch means disposed between the first biasing means and the reduction means for transmitting the winding-up force of the winding-up drive means when the winding-up drive means is operated, thereby returning the first biasing means back to its initial condition.
A webbing tension device adapted for use in a seatbelt system for securing an occupant of a vehicle during an emergency vehicular situation of the type wherein a webbing takeup shaft for winding an occupant restraining webbing thereon is always biased in a web winding direction by a small biasing means and the takeup shaft is biased in the web winding direction by a large biasing means in an emergency vehicular situation, thereby imparting an occupant securing tension to the webbing, comprising:
- (a) a first clutch means disposed between the takeup shaft and the large biasing means for transmitting the large biasing force of the large biasing means to the takeup shaft in the emergency vehicular situation;
- (b) a winding-up drive means for winding up the large biasing means after the large biasing force is spent in the emergency situation of the vehicle;
- (c) a reduction means for reducing the winding-up motion of the winding-up drive means;
- (d) a second clutch means disposed between the large biasing means and the reduction means for transmitting the winding-up force of the winding-up drive means to the large biasing means when the winding-up drive means is actuated, thereby returning the large biasing means back to its initial condition;
- and
- (e) a trigger means for actuating the large biasing means in an emergency situation of the vehicle,
- whereby an occupant securing tension is imparted to the webbing by the large biasing means in an emergency vehicular situation.
A webbing tension device adapted for use in a webbing retractor for winding an occupant restraining webbing therein and for imparting an occupant securing tension to the webbing in an emergency vehicular situation which comprises:
- (a) a large spiral spring for biasing a webbing takeup shaft in a web winding direction in an emergency situation of the vehicle;
- (b) a first clutch means disposed between the takeup shaft and the large spiral spring for transmitting the biasing force of the large spiral spring to the takeup shaft in the emergency vehicular stituation;
- (c) a motor for winding up the large spiral spring after the biasing force of the large spiral spring is spent in the emergency situation of the vehicle;
- (d) a reduction gear including a worm gear rotated by the motor and a worm wheel engaging the worm for reducing the rotational motion of the motor;
- (e) a second clutch means disposed between the large spiral spring and the worm gear for transmitting the winding-up force of the motor to the large spiral spring when the motor is rotated, thereby returning the large spiral spring back to its initial condition, and
- (f) a trigger means for actuating the large spiral spring in the emergency situation of the vehicle,
- whereby an occupant securing tension is imparted to the webbing by the large spiral spring.
Dependencies are inferred from the claim text.