| 摘要 |
The tool has a reciprocating barrel mounted in a housing and includes a ram mounted in the barrel for driving a fastener into a work surface. The firing mechanism has a firing pin and a firing pin driver which the operator strikes with a hammer to fire a cartridge chambered in the tool. The firing pin driver is biased to a retracted safe position when the tool is not cocked so as to prevent drop fire. A detent pawl is mounted on the ram to provide frictional retention forces for the ram and barrel. The pawl cooperates with a resilient stop mounted on the housing to return the ram from a driven position to a driving position when the barrel is reciprocated in the housing, and the pawl also engages a breechward stop formed in the housing which prevents the ram from contacting a chambered cartridge when the tool is in a breech-closed, ready-to-fire condition. Bellville washer stacks are used to position the firing mechanism. An improved hand grip is also provided. The grip is fitted about the tool housing and is made from a relatively soft plastic such as a poly propylene. It includes a breechward conical shield which protects the hand, and a resilient muzzleward deflectable flange for operator comfort.
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