Seat belt pretensioner
US6419177B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 2001 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Feb 5, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2022/468
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pretensioner 10 for a seat belt 12 utilizes a strap 34 coiled about a clutch assembly 46 wherein the clutch assembly 46 is in normal operation of a vehicle, rotatable about a portion of a webbing reel shaft 16. The pretensioner 10 contains a first passage 20 and a second passage 22 for the respective containment of the clutch assembly 46 and an actuator 32, wherein each passage is formed perpendicular and in volumetric intersection with the other. The pretensioner 10 also contains a gas generant composition 30 in combustive communication with the actuator 32. Upon ignition, the gas pressure produced by the pyrotechnic 30 propels the actuator 32 into the strap 34, thereby effecting rotary advancement of the clutch assembly 46 and the shaft 16, and thus pretensioning the seat belt 12 wound about a spool 13 of a seat belt retractor 14, wherein the spool 13 is rotatably engaged with a second portion of the shaft 16 and thus provided in coaxial relation with the clutch assembly 46.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.