Patent ID: 6655033
Filing Date: 2003-12-02
Classification: B25F,B26B

Abstract:
A rotary knife operable from a source of high pressure air comprising:a tubular handle assembly; an annular blade supported for rotation about a central axis; a blade housing supporting said blade; a head assembly connected to said handle assembly; a pneumatic motor assembly supported by said handle assembly for driving said blade; a control valve for controlling the flow of air from the source to the motor assembly, said control valve having an open condition wherein source air is supplied to said motor assembly for operating the motor and a closed condition wherein source air is blocked from reaching the motor assembly, said control valve shiftable into said handle assembly when operated to said open condition and shiftable in a direction away from said handle assembly when operated from its open condition to its closed condition; said control valve having an air delivery port defined by a valve seat through which air is directed into said motor assembly when said control valve is in said open condition, said delivery port communicating with atmospheric air when said control valve is in said closed condition so that control valve leakage does not result in unintended knife operation.