Gas generating device
US5215721A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1991 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Sep 6, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R21/2644
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A gas generating device for supplying gas in an air bag or the like is provided with a gas generating composition, which is burned by an ignitor to generate gas, and a primary filter for filtering the burnt gas. The gas generating composition and the filter are placed in a combustion chamber having a primary gas exhausting port. The primary filter is chemically inactive with respect to the burnt procedure of the gas generating composition. The filter has a metal screen whose melting point is equal to or higher than the burning temperature of the gas generating composition. A cooling chamber is provided which communicates via the primary gas exhausting port with the combustion chamber. In the cooling chamber is disposed a secondary filter which cools gas coming out of the combustion chamber and filters the burning residue in the gas. A secondary gas exhausting port is formed in the cooling chamber to discharge the gas filtered by the secondary filter. The secondary filter includes a ceramic fiber sheet with a bulk density of 0.10 to 0.30 g/cm.sup.3 and a filtering period of 1.0 to 6.0 sec/300 cc per 1 mm in thickness (time needed to pass 300 cc of gas through the filter).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.