| 摘要 |
A pneumatic fastening tool includes a piston reciprocally disposed in a cylinder, a hammer mounted on the piston for driving engagement with a fastener, and an improved poppet valve disposed at one end of the cylinder and operable to direct high pressure air to cause selected movement of the piston in the cylinder. The poppet valve includes a poppet valve casing having an inner surface, and a reciprocally movable poppet valve member having an end surface that confronts and repetitively engages the inner surface of the poppet valve casing. The poppet valve member end surface includes a portion thereof which is of a material more resilient than the inner surface of the poppet valve casing which it engages.
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