Safety belt retractor having a pretensioning device
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United States of America Patent
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Issued Date -
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app pub date -
Jul 5, 2011
filing date -
May 29, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A safety belt retractor, especially for use in motor vehicles, is provided, and has a blocking system and a tensioning device, which acts on a belt shaft, for carrying out a reversible pretensioning of an occupant. A spiral toothing meshes with an external toothing of the belt shaft, and is supported against a fixed counter-bearing such that upon an axial loading of the spiral toothing directed against the counter-bearing due to load acting on the belt shaft in a belt withdrawal direction, rotation of the spiral toothing, for receiving torque applied by the belt shaft, is prevented via a support force. An electric motor is coupled to the belt shaft via the spiral toothing.
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