Patent ID: 7493988

Claim:
A lubricating tool for supplying a lubricant and air as a lubricating mixture to a cutting location where a cutter engages a workpiece, said lubricating tool comprising a housing ( 10 ) enclosing a hollow cylinder, a piston ( 3 ) in said hollow cylinder dividing said hollow cylinder into an air pressure chamber ( 3 A) and a lubricant supply chamber ( 3 B), a compression spring ( 2 ) positioned in said air pressure chamber ( 3 A) between said piston ( 3 ) and said housing ( 10 ), an exchangeable lubricant and air mixing attachment ( 9 ) securable to said housing ( 10 ), a flow control valve (V 2 ) connected to said housing ( 10 ), said flow control valve (V 2 ) having a first port communicating with said lubricant supply chamber ( 3 B), a second port communicating with said exchangeable lubricant and air mixing attachment ( 9 ) and a third port communicating with a lubricant source ( 1 A) , said flow control valve (V 2 ) further comprising a control input for switching said flow control valve between filling said lubricant supply chamber ( 3 B) from said lubricant source ( 1 A) and feeding lubricant from said lubricant supply chamber ( 3 B) to said exchangeable lubricant and air mixing attachment ( 9 ), said lubricating tool further comprising a pressurized air conduit ( 5 ) communicating said air pressure chamber ( 3 A) and said exchangeable lubricant and air mixing attachment ( 9 ) with a pressurized air source ( 1 B), said lubricating tool further comprising an output ( 9 A) connected to said exchangeable lubricant and air mixing attachment for feeding said lubricating mixture to said cutting location in response to operating said flow control valve (V 2 ).