| 摘要 |
A device for tightening a safety belt for vehicles provided with an inertial switch adapted to sense abnormal changes in the movement of the vehicle, a motor being arranged to activate the safety belt by means of a cylindrical inertial body connected thereto. The body under normal operating conditions is under rotation, and activating means is also provided to connect with the inertial body to tighten the safety belt when such abnormal changes in movement take place, thereby utilizing the energy of the rotating body for tightening of the belt.
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