Safety belt roll-up mechanism having a force limitation device actuatable as a function of the length of belt strap withdrawn
US7690688B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 2006 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Aug 26, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2022/288
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A safety belt roll-up mechanism is provided, and includes a force limitation device that operates in a multi-stage manner and has a two-stage torque rod and a pyrotechnically operating switching device that couples the torque rod, in various clamping lengths, with a belt shaft. The extent of the belt strap unwound from the belt shaft is utilized for actuation of the force limitation device. A ratchet wheel is connected to the belt shaft via a reduction gear mechanism. A portion of the periphery of the ratchet wheel has a toothing for engaging the reduction gear mechanism. A further portion of the periphery of the ratchet wheel has a switching contour that rests against a contact pin of an electric switch. The switching contour has a profile that effects the connection or disconnection of the switching device for the torque rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.