Pilot valve for a pneumatic tool
OwnerPaul Kirschinventor
Life of this patent
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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.
Claims11
A tool (20) for impacting a workpiece (22), comprising;
- a casing (42) defining a chamber (48),
- an impactor device (24, 54) slidable within said chamber (48) for impacting the workpiece (22),
- an exhaust valve (100) for selectively introducing and releasing pressurized fluid into and out from said chamber (48) to slide said impactor device (24, 54) in said chamber (48), and
- a pilot valve (200) in fluid communication with said exhaust valve (100) for controlling said exhaust valve (100),
- said pilot valve (200) including a sealing member (214) having an initial position for sealing off fluid communication between said exhaust valve (100) and atmosphere and a biasing device (216) for biasing said sealing member (214) from said initial position to an actuation position to instantaneously provide fluid communication between said exhaust valve (100) and atmosphere to actuate said tool (20).
Dependencies are inferred from the claim text.