Patent ID: 6533509
Filing Date: 2003-03-18
Classification: B23B,B23Q,Y10T

Abstract:
A powered machine tool and tool holder unclamp mechanism therefor, comprising in combination:a non-rotating machine tool body; a rotating machine tool spindle disposed through said machine tool body; a rotating drawbar axially concentrically disposed through said machine tool spindle; said drawbar having a first end, a second end opposite said first end, and a concentric axial coolant passage therethrough; a fluid coolant line for selectively delivering coolant to said coolant passage of said drawbar; a selectively installable tool holder disposed at said second end of said drawbar; spring means urging said drawbar to a retracted position for securing said tool holder to said spindle; a tool holder unclamp union having a non-rotating first end and housing, a rotating second end opposite said first end thereof, and an axial coolant passage disposed concentrically therethrough from said first end to said second end thereof; said first end of said union being immovably affixed to said fluid coolant line; said second end of said union being immovably affixed to said first end of said drawbar; a non-rotating first seal and a rotating second seal disposed concentrically within said union, with said first seal and said second seal bearing against one another for sealing coolant flow within said coolant passage of said union when coolant pressure is applied therethrough; and means for selectively imparting pressure to said first end of said drawbar and externally to said union in order to extend said second end of said drawbar from said spindle, to remove said tool holder from said second end of said drawbar and to preclude application of force to said first seal and said second seal of said union.