Chip-removing rotary tools

Claim 1

An elongated chip-removing rotary tool comprising an axially extending shank part, arranged to be held for imparting rotary motion to said tool through said shank, a cylindrical part secured at one end to and extending axially from said shank, a fluted part secured to and extending axially from the other end of said cylindrical part, at least one coolant tube formed in and extending along said fluted part for supplying coolant for a cutting operation, and said coolant tube having the inlet end thereof located in said cylindrical part, an annular shaped connector disposed about said cylindrical part for supplying coolant to said tube, the inner surface of said connector being spaced outwardly from said cylindrical part, wherein the improvement comprises a ring rigidly connected to an disposed about said cylindrical part and the inner surface of said ring and the outer surface of said cylindrical part forming a closed annular inlet chamber for coolant, said coolant tube having its inlet end in communication with said inlet chamber, at least one bore formed in said ring extending between said inlet chamber and the outer surface of said ring, said ring being positioned within said connector and having its radially outer surface in sealing sliding contact with the inner surface of said connector, the inner surface of said connector and the outer surface of said ring forming a closed annular space for admitting coolant from said connector to said ring, said bore in said ring extending between said annular chamber and said annular space located between said connector and said ring for conducting coolant from said annular space to said annular chamber from where the coolant flows into said coolant tube.