Seat belt tension adjuster
AssigneeTakata Corporation
InventorHideaki Yano
Life of this patent
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Abstract
A seat belt tension adjuster adjusts tension on a seat belt wound on a reel by a biasing spring. The tension adjuster includes a biasing force adjusting mechanism situated between the reel and the spring for adjusting a biasing force transmitted from the spring to the reel depending on a rotational angular position of the reel. The biasing force adjusting mechanism includes a cam for gradually changing the biasing force based on the rotational angular position of the reel. The tension adjuster can freely set the withdrawing force and the winding force of the seat belt.
Claims5
A seat belt tension adjuster for adjusting tension on a seat belt wound on a reel by a biasing spring to be used in a vehicle, comprising:
- a biasing force adjusting mechanism situated between the reel and the spring for adjusting a biasing force transmitted from the spring to the reel depending on a rotational angular position of the reel, said biasing force adjusting mechanism including a cam for setting a biasing force adjusting ratio to be an arbitrary function depending on the rotational angular portion to thereby gradually change the biasing force based on the rotational angular position of the reel;
- a slit plate having an input shaft to be connected to the spring and a first slit extending in a radial direction from the input shaft;
- a lever to be connected to the reel and having a second slit;
- and a pin;
- said cam being disposed between the slit plate and the lever and having a cam groove so that the pin is slidably situated in the first and second slits through the cam groove.
Dependencies are inferred from the claim text.