Gas bag for a restraining system in vehicles and a fabric for the production thereof
US5662354A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1995 |
| Grant date | Sep 2, 1997 |
| Priority date | — |
| Expiry date | Apr 13, 2015 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD03D1/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An air bag for a vehicle occupant restraint system comprises several sewn fabrics parts. All fabric parts consist of fabric which has the same fiber density and filament yarn. The gas permeability curve of the entire gas bag increases as a function of the internal gage pressure. At a gage pressure of approximately 10 kPa the permeability is at a value between approximately 0.4 and approximately 1.0 m.sup.3 /s. On further increases in gage pressure to values between approximately 10 kPa and approximately 20 kPa, the gas permeability of the air bag reaches a maximum and then decreases when the gage pressure is above approximately 20 kPa to at least approximately 40 kPa. This form of the gas permeability curve means that hardness of the air bag is automatically regulated in order to provide low hardness during the initial pressure build up. A high impact intensity penetration by the occupant into the air bag is prevented by increased hardness due to relatively low permeability of the air bag material at high pressures in the air bag.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.