| 摘要 |
A pneumatic impact tool comprising a housing, an open ended cylinder inserted therein and a hammer piston reciprocably guided within the cylinder. In the forward end of the cylinder there is received the shank of a chisel onto which the hammer piston imparts impacts. The piston is a differential piston having its big end facing the chisel and forming around its rear, small diameter neck a rear annular, constantly pressurized chamber which continuously communicates with the pressure air inlet through a pulsator chamber. The forward cylinder chamber, enclosed between the chisel shank and the piston front area, is intermittently pressurized through an internal passage of the piston, which passage is periodically connected to the pressure air inlet by means of valve openings in the piston neck.
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