Pilot valve for a pneumatic tool
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United States of America Patent
Stats
-
Aug 7, 2007
Grant Date -
Jul 27, 2006
app pub date -
Mar 17, 2006
filing date -
Dec 3, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic tool (20) for impacting a workpiece (22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exhaust valve (100) controlled by a pilot valve (200) slides the piston (54) by selectively introducing and releasing pressurized fluid into and out from the chamber (48). The pilot valve (200) includes a valve housing (202) defining a pilot chamber (204) with a plunger (206) slidable in the pilot chamber (204). The pilot valve (200) actuates the tool (20) by quickly releasing pressurized fluid from the exhaust valve (100) to atmosphere. The pilot valve (200) includes a spring-biased annular seal (214) that is releasable from a poppet seat (222) to perform this function.
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