Patent ID: 8579175
Filing Date: 2013-11-12
Classification: B25C,F15B

Abstract:
1. A pneumatic nailer, comprising: a tool housing enclosing a cylinder with a reciprocating drive piston, and having a trigger and a workpiece contact element both connected to a trigger valve; a valve cap mounted to said housing and including a cycle valve and a dump valve, each said valve reciprocating in a respective valve chamber; said dump valve controlling drive pressure for said drive piston, said cycle valve controlling the return of said dump valve to allow piston return; said dump valve controlling a main valve controlling pressure to said drive piston and said cycle valve constructed and arranged for receiving signal pressure from a return chamber to move said dump valve to close said main valve; and said valve cap being constructed and arranged such that said piston is returned to a start position independent of positions of said trigger or workpiece contact element.