| 摘要 |
A pretensioner (10) for a seat belt (13) utilizes a relatively inexpensive gas-producing cartridge (12) that is easily replaced after activation so as to condition the pretensioner for subsequent use. The cartridge is similar to a shotgun shell and is chambered in a breech block (22). The cartridge contains a gas-producing pyrotechnic (32) and a piston (36). Upon ignition, gas produced by the pyrotechnic effects advancement of the piston (36) which, through an associated mechanism, takes up slack in the seat belt (13).
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