Improved automatic safety belt of the type that incorporates an automatic winding shaft for one of the belts of the belt, said shaft being provided with an inclined tooth crown that in combination with a swinging trigger constitutes a ratchet; essentially characterized in that the trigger is provided at a midpoint of a plane, by which it sits, in an inoperative position with respect to the crown, on another plane provided in the head of a pendulum that is constituted by a body of center of gravity, low, whose pendulum is provided, above the center of gravity, with a transverse hole determined by two inverted cone trunks that, at the junction of their smaller bases, rest on an axis from which the pendulum hangs, determining with their oscillations the position of the trigger with respect to the ring gear. (Machine-translation by Google Translate, not legally binding)
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