Pretensioner for webbing retractor
US6343758B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2000 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Apr 25, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R22/4628
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a pretensioner for a webbing retractor, an upper wall portion of a sealing member extends arcuately around an external periphery of a seal holding portion which is formed integrally with a bottom surface of a piston, and the sealing member includes a side wall portion proximate an inner wall of a cylinder. The sealing member is formed from an elastic material, and may be annular or a ring with an angle of 360 degrees or more. In an emergency state of a vehicle, when the piston is moved by gas pressure, the sealing member is pressed against the bottom surface of the piston by gas pressure, and a diameter of the sealing member is increased. Accordingly, the sealing member provides sealing between the piston and the inner wall of the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.