Drive unit for a belt pretensioner in a safety belt system for vehicles
US5450723A · kind A · utility
25Cited by
2References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1994 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Mar 3, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2022/4661
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A belt pretensioner for vehicle safety belt systems is provided with a drive unit which comprises a pyrotechnic gas generator (12) and a piston and cylinder unit (16, 20). The piston (20) is arranged at a first end (161) of the cylinder (16) and is connected with a cable (22). By means of the gas pressure produced by the gas generator (12) the piston is accelerated towards the second, tapered end (162) of the cylinder (16). A sleeve-like insert (18) is arranged in the tapered cylinder end. The insert (18) has ribs and grooves alternating in the peripheral direction to offer sufficient room for plastic deformation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.