| 摘要 |
A seat belt retracting and winding device is provided with a driving wheel rotatable in unison with a seat belt winding shaft, ratchet means consisting of a ratchet wheel and a catch, a cam disk and a catch holding disk adapted to maintain the catch in position in engagement with or disengagement from said ratchet wheel. Strong and weak springs are encased within the ratchet wheel and the driving wheel, respectively, and are interconnectable in series to each other. When the seat belt is paid out and fastened, the catch holding disk and the catch cooperate with each other to lock the ratchet wheel so that the strong spring is disconnected from the weak spring and consequently unpleasant restraining force on a driver or occupant may be reduced or relaxed. On the other hand when the seat belt is unfastened, the rotation of the winding shaft in the opposite direction causes the cam disk and the catch holding disk to cooperate with each other so as to release said locked ratchet wheel for free rotation so that the strong spring is drivingly coupled to the weak spring and consequently the positive and complete retraction of the seat belt may be ensured. |
