| 摘要 |
A pneumatic impact tool and method includes a cylinder pipe or housing closed with a cover, as well as an impact piston that forms a first pressure chamber between an impact plate and the impact piston, and a second pressure chamber between the cover and the impact piston. The cover is provided with at least one opening, the surface of which is smaller than the piston surface, whereby the impact piston seals the opening when it is in its fully retracted position.
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