Patent ID: 7114746

Claim:
A gas generator for an air bag comprising: a housing having a gas discharging port; a substantially cylindrical inner cylindrical member disposed in the housing, an ignition means accommodating chamber defined inside the inner cylindrical member, a combustion chamber defined outside the inner cylindrical member; and plural flame-transferring holes formed in the circumferential surface of the inner cylindrical member to communicate the ignition means accommodating chamber with the combustion chamber, wherein the plural flame-transferring holes are formed at a distance of less than 30% of the axial length of the inner cylindrical member, from an end of the inner cylindrical member, the flame-transferring hole is formed to have the inner diameter of 1 to 4 mm, and the flame-transferring holes are formed radially on the circumferential surface of the inner cylindrical member, and the central angle formed by the adjacent flame-transferring holes being not less than 60 degrees.