Machine tool spindle cooling system

Claim 1

IN A MILLING MACHINE SPINDLE CARRIER HAVING A CYLINDRICAL QUILL RECEIVED THEREIN, THE QUILL HAVING A BORE THERETHROUGH, A SPINDLE RECEIVED THROUGH THE QUILL BORE, AND A PLURALITY OF AXIALLY SPACED ANTIFRICTION BEARINGS IN THE QUILL BORE AROUND THE SPINDLE FOR ROTATABLE SUPPORT THEREOF, A FLUID COOLING SYSTEM COMPRISING: (A) A PLURALITY OF ANNULAR GROOVES IN THE QUILL BORE, EACH OF THE BEARINGS HAVING AT LEAST ONE OF SAID GROOVES EXTENDING CIRCUMFERENTIALLY THEREAROUND, (B) A PAIR OF SLOTS EXTENDING AXIALLY ALONG THE PORTION OF THE OUTER SURFACE OF SAID QUILL, (C) A PAIR OF FLUID PASSAGE IN THE SPINDLE CARRIER DEFINING AN INPUT PASSAGE TERMINATING AT ONE END IN ONE OF SAID SLOTS AND AN EXHAUST PASSAGE TERMINATING AT ONE END IN THE OTHER OF SAID SLOTS, (D) A BUSHING FIXED IN THE QUILL AROUND THE SPINDLE WITH THE OUTER SURFACE THEREOF CONTACTING THE SURFACE OF THE QUILL BORE, (E) A SPIRAL GROOVE FORMED IN THE OUTSIDE SURFACE OF SAID BUSHING AND, WITH SAID QUILL, FORMING A SPIRAL FLUID CHANNEL AROUND AND ALONG THE QUILL BORE, AND (F) MEANS FOR TRANSMITTING FLUID FROM ONE OF SAID SLOTS SERIALLY AROUND THE BEARINGS AND ALONG THE SPINDLE TO THE OTHER OF SAID SLOTS, SAID MEANS INCLUDING SAID SPIRAL FLUID CHANNEL AND A PLURALITY OF AXIAL PASSAGES THROUGH SAID QUILL, SAID AXIAL PASSAGE HAVING A PLURALITY OF INTERSECTING RADIAL PORTS AT SPACED LOCATIONS ALONG THE QUILL, ONE OF SAID PORTS EXTENDING BETWEEN ONE OF SAID AXIAL PASSAGES AND SAID ONE SLOT, ANOTHER OF SAID PORTS EXTENDING BETWEEN ANOTHER OF SAID AXIAL PASSAGES AND SAID OTHER SLOTS, AND OTHER OF SAID PORTS COMMUNICATING BETWEEN SAID AXIAL PASSAGES AND SAID ANNULAR GROOVES AND SPIRAL FLUID CHANNEL.