Rotatable tooholder having a stationary, through-center coolant feed system

A rotatable toolholder having a stationary coolant feed system for providing a through-center non-rotating coolant stream to a coolant conducting bore of a rotating tool, comprising:

• a stationary housing;
• a driven shaft having an output end rotatably mounted in a first side of said housing;
• a coupling means rotatably mounted in a second side of said housing that is opposite from said first side for holding and rotating an end of a tool having a bore along its axis of rotation for conducting coolant;
• a coolant system including
• i) a nozzle assembly stationarily mounted within said housing and having a nozzle means for directing a non-rotating stream of coolant into said coolant conducting bore of said tool in a path that is collinear with the axis of rotation of said tool;
• and
• ii) stationary conduit means for conducting a coolant flow from said coolant conducting bore to said nozzle assembly while isolating said coolant flow from the interior of the housing, and
• means for transmitting rotary power from said driven shaft to said coupling means through said housing to rotate said tool end.

A rotatable toolholder having a stationary coolant feed system for providing a through-center, non-rotating coolant stream to a coolant receiving opening of a rotating cutting tool having a coolant conducting bore for applying coolant to a workpiece at a point of rupture, comprising:

• a stationary housing;
• a driven shaft having an output end rotatably mounted in said housing;
• a coupling means rotatably mounted in said housing for holding and rotating the end of said cutting tool having said coolant conducting bore;
• a coolant system including
• i) a nozzle assembly stationarily mounted within said housing, said nozzle assembly having first and second ends rotatably mounted to said driven shaft and coupling means, respectively, for conducting reactive thrust forces therebetween, and including a nozzle means for directing a non-rotating stream of coolant into said coolant conducting bore of said tool;
• and
• ii) stationary conduit means for conducting a coolant flow from said coolant conducting bore to said nozzle assembly while isolating said coolant flow from the interior of the housing, and
• means for transmitting rotary power from said driven shaft to said coupling means through said housing to rotate said tool end.