Winding – tensioning – or guiding – Reeling device – With spring motor
Patent
1998-08-27
2000-05-23
Jillions, John M.
Winding, tensioning, or guiding
Reeling device
With spring motor
280806, B60R 2246
Patent
active
060657049
ABSTRACT:
An improved pyrotechnic-operated seat belt tensioner provides variable energy management to enable tailoring operation of the seat belt tensioner to different applications. A seat belt tensioner has a reel mounting one end of a seat belt, a pressure chamber, and a piston having screw threads connecting to the reel. The reel is rotatable to retract and extend the seat belt. The piston is mounted for movement in the chamber in response to activation of pyrotechnic devices, which exert a force on the piston, to rotate the reel to retract the seat belt. A pair of pyrotechnic devices are provided which are separately actuatable to selectively activated to vary the magnitude and duration of the force. A third pyrotechnic device is provided to selectively open a chamber vent. The piston and pressure chamber are configured to prevent piston rotation.
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Brown Michael Anthony
Lair, Jr. James Orin
Maikis Kevin J.
Pywell James Frederick
General Motors Corporation
Jillions John M.
Marra Kathryn A.
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