| 摘要 |
A pneumatic power tool for reciprocating a blade to cut a workpiece. The power tool includes a body having a hollow interior and a passage extending through the body between the hollow interior and an opening in an exterior surface of the body. The interior has first and second ports spaced apart at first and second positions along a central axis of the interior for alternately admitting air into the interior. The tool also includes a connector to connect a pneumatic hose to the tool for delivering pressurized air to the tool. A throttle is positioned along the passage for selectively permitting pressurized air to flow through the passage, and a valve is also positioned along the passage for alternately directing air through one of the first and second ports to pressurize the interior at a corresponding one of the first and second positions. Further, the tool includes a piston unit having a head received within the interior between the first and second positions for reciprocating the unit along a longitudinal axis between extended and retracted positions. One of the piston unit and the body has a groove extending parallel to the longitudinal axis of the unit, and another of the unit and body has a protrusion which engages the groove and which reciprocates in the groove as the piston unit reciprocates between the extended and retracted positions to prevent the unit from rotating relative to the body.
|
