Patent ID: 7690688
Filing Date: 2010-04-06
Classification: B60R

Abstract:
1. A safety belt roll-up mechanism comprising: a housing; a belt shaft that is mounted in said housing and serves as a carrier for a belt strap that can be wound onto and unwound from said belt shaft; a force limitation device that operates in a multi-stage manner and has a two-stage torsion rod and a pyrotechnically operating switching device that couples the torsion rod, in various clamping lengths, with said belt shaft, wherein an extent of belt strap unwound from said belt shaft is utilized for an actuation of said force limitation device; a reduction gear mechanism; a ratchet wheel that is connected to said belt shaft via said reduction gear mechanism, wherein said ratchet wheel is provided over a portion of a periphery thereof with a toothing for engagement with said reduction gear mechanism; and an electric switch that is connected to said switching device for said torque rod, and that has a contact pin, wherein said ratchet wheel is provided over a further portion of its periphery with a switching contour that rests against said contact pin of said electric switch, and wherein said switching contour has a profile that effects a connection or disconnection of said switching device for said torsion rod.