Belt retractor with tension relief for safety belt restraining systems in vehicles
US5285982A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Nov 19, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2022/4433
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
For tension relief in comfort operation of a belt retractor for safety belt restraining systems in vehicles an auxiliary spring (42) is provided which is selectively connectable parallel to the retracting spring (30) but with opposite effect. The auxiliary spring (42) is connected with its outer end to the outer periphery of a ratchet wheel (38) which can be selectively locked by a pawl, and with its inner end via an overrunning clutch (44) is connected to a shaft (36) which is non-rotatably connected to the belt spool (22). The overrunning clutch (44) permits a relative rotation between the end of the auxiliary spring (42) connected thereto and the belt spool (22) only in the unwinding direction of the latter. The changeover between normal and reduced retracting force takes place without any shock or noise whatever.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.