Seat belt retractor
AssigneeNissan Motor Co., Ltd.
InventorsKen Kamijo, Yasuyuki Uekusa
Life of this patent
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Abstract
A seat belt retractor comprises a take-up shaft which is spring biased in a belt retracting direction; a planetary gearing having a sun gear nonrotatably mounted to the take-up shaft, a ring gear and a planet pinion; a mechanical tensionless mechanism which prevents the planet pinion from orbiting in the same direction as the belt retracting direction; and a motor actuated slack control mechanism meshing with the ring gear, wherein the tensionless state is established by preventing the orbiting movement of the planet pinion and the slack control is effected by rotating the ring gear.
Claims5
A seat belt retractor comprising:
- a housing;
- a take-up shaft rotatably mounted to said housing;
- a spring means for biasing said take-up shaft in a belt retracting direction of retracting a seat belt;
- a gear mechanism operatively coupled to said take-up shaft;
- a tensionless mechanism operatively coupled to said gear mechanism and operable to prevent said take-up shaft from rotating in said belt retracting direction;
- a motor actuated slack control mechanism operatively coupled to said gear mechanism and operable to rotate said take-up shaft;
- and
- means for controlling operation of said tensionless mechanism and said motor actuated slack control mechanism.
In a vehicle having a seat having a seat adjustable mechanism,
- a seat belt retracting comprising a housing, a take-up shaft rotatably mounted to said housing, a spring means for biasing said take-up shaft ina belt retracting direction of retracting a seat belt, a planetary gearing including a sun gear nonrotatably mounted to said take-up shaft, a ring gear rotatably mounted to said take-up shaft and a planet pinion meshing with said sun gear and said ring gear, a tensionless mechanism operable to prevent said planet pinion from orbiting in the same direction as said belt retracting direction of said take-up shaft, a motor actuated slack control mechanism meshing with said ring gear and operable to rotate said ring gear;
- a sensor means for generating an output signal indicative of running state of the vehicle;
- a control unit operative connected to said tensionless mechanism and said motor actuated slack control mechanism, said control unit including means for determining a desired slack of the seat belt in response to said output signal, and means for controlling said motor actuated slack control mechanism in such a manner as to reduce a deviation from said desired slack.
Dependencies are inferred from the claim text.