| 摘要 |
<p>Disclosed is a pre-tensioner for enabling a spool wound with a safety belt to make a forced reverse rotation in an emergency, which includes a gas-generating device for delivering a gas expansion force generated from gas explosion to a base cartridge upon abrupt decrease of the speed of a vehicle, a rack for protruding from the base cartridge due to the expansion force, a pinion for engaging the rack for rotation upon protrusion of the rack by a given length, a case gear with one face receiving one side of the spool and the other face receiving the pinion, and a plurality of wedges arranged between the pinion and the case gear. The pre-tensioner can quickly stop the rotation of the spool wound with the safety belt, and secure a sufficient force to stop the rotation of the spool.</p> |
