Patent ID: 7441803

Claim:
A gas generator for an air bag comprising: a cylindrical housing formed by a diffuser shell that is provided with a gas discharge port and including a top wall, a first circumferential wall, and a first bent portion connecting the top wall and the first circumferential wall, and a closure shell including a bottom wall, a second circumferential wall, and a second bent portion connecting the bottom wall and the second circumferential wall, at least one of the first circumferential wall and the second circumferential wall being inclined from the first bent portion and the second bent portion, respectively, to spread radially and outwardly with respect to a longitudinal axis of the cylindrical housing; a gas generating means, provided within the cylindrical housing, to generate an operating gas for inflating an air bag; and a cylindrical coolant means to carry out at least one of cooling and purifying the operating gas and being provided within the housing such that at least one of an upper outer periphery and a lower outer periphery thereof is in attachment to the first bent portion and the second bent portion, respectively; and a gap forming a flow-path of the operating gas secured between an outer circumferential surface of the cylindrical coolant means and inner surfaces of the first circumferential wall and the second circumferential wall.