PRETENSIONER HAVING FRACTURE CONNECTION-TYPE RACK GEAR
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United States of America Patent
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app pub date -
Apr 23, 2015
filing date -
Apr 29, 2014
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Abstract
A pretensioner having a fracture connection-type rack gear includes: a housing having a receiving space; a pinion gear provided in the receiving space, connected to a rotating shaft of a spool around which a webbing of a seat belt is wound, and rotated by rotation of the spool; a micro gas generator generating explosive power by impact from the outside; a conveying pipe having one side connected with the micro gas generator and the other side having an opening and connected to the receiving space; ball members provided in the conveying pipe, and conveyed toward the receiving space by the explosive power; and a rack gear provided to be fixed into the receiving space by a fixing unit, meshing with the pinion gear when the fixing unit is fractured, and rotating the pinion gear, by residual thrust of the ball members, in a direction in which the webbing is retracted.
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