Multiple function cutting tool

Claim 2

A cutting tool comprising: a substantially cylindrical body having a first end, a second end, and a longitudinal axis; a tip defined at said first end of said cylindrical body, said tip including a pair of radial cutting edges inclined with respect to said axis; each radial cutting edge having at least primary and secondary clearances in trailing positions relative thereto; said primary clearances of said respective radial cutting edges intersecting along a line which defines said tip; first and second peripheral cutting edges extending about said cylindrical body, said first peripheral cutting edge joining one of said radial cutting edges at a first interface, said second peripheral cutting edge joining the other of said radial cutting edges at a second interface; each peripheral cutting edge including both primary and secondary clearances in a trailing position relative thereto; each of said peripheral cutting edges being separated by a spiral flute, each of said flutes including a relatively large convex portion trailing said peripheral cutting edges and a relatively small concave portion trailing said convex portion; said flutes being shallow relative to a diameter of said tool defined by said peripheral cutting edges, thereby substantially preventing chattering during horizontal cutting and chamfering operations.

Claim 3

A cutting tool as defined in claim 1 including a tertiary clearance for each of said radial cutting edges adjoining said respective secondary clearances.

Claim 4

A cutting tool as defined in claim 1 wherein said radial cutting edges are disposed at a 90° included angle relative to each other as viewed in a plane containing the axis of the tool.

Claim 5

A cutting tool as defined in claim 2 including respective gashes trailing said secondary and tertiary clearances of each of said radial cutting edges, said gashes inclined with respect to said axis and respectively adjoining said respective secondary and tertiary clearances of said radial cutting edges.

Claim 6

A cutting tool as defined in claim 4 wherein said gashes respectively intersect said convex and concave portions of said flutes.

Claim 7

A cutting tool as defined in claims 4 or 5 including first and second leading tip surfaces respectively adjoining said radial cutting edges and said gashes.

Claim 8

A cutting tool as defined in claim 6 wherein said gashes and said leading surfaces form an included angle exceeding 90° viewed in an axial plane.

Claim 9

A cutting tool as defined in claim 1 wherein said radial cutting edges intersect opposite ends of said line defining said chisel tip.

Claim 10

A cutting tool as defined in claim 1 wherein said primary clearance of each of said peripheral cutting edges intersects said primary clearance of said respective radial cutting edges, and said secondary clearance of each of said peripheral cutting edges intersects said primary and secondary clearances of said respective radial cutting edges.

Claim 11

A cutting tool as defined in claim 6 wherein said gashes and said leading surfaces respectively intersect said concave portion of said respective flutes.

Claim 12

A cutting tool as defined in claim 6 wherein said first leading tip surface adjoins one of said respective gashes, one of said radial cutting edges, a trailing edge of said primary clearance of the other of said radial cutting edges, and said concave portion of one of said flutes.

Claim 13

A cutting tool as defined in claim 11 wherein said first leading tip surface forms an acute angle with said primary clearance of said one of said radial cutting edges.

Claim 14

A cutting tool comprising: a substantially cylindrical body having a first end, a second end, and a longitudinal axis; a cutting tip defined at said first end of said cylindrical body, said tip including first and second radial cutting edges, each of said radial cutting edges being inclined with respect to said axis; a first leading tip surface, a first primary clearance adjoining said first leading tip surface along a line defining said first radial cutting edge, a second leading tip surface; a second primary clearance adjoining said second leading tip surface along a line defining said second radial cutting edge; a first secondary clearance adjoining said first primary clearance along a trailing edge thereof; a second secondary clearance trailing said second primary clearance along a trailing edge thereof; said first leading tip surface adjoining said trailing edge of said second primary clearance; said second leading tip surface adjoining said trailing edge of said first primary clearance; first and second peripheral cutting edges extending helically about said cylindrical body, said first peripheral cutting edge adjoining said first radial cutting edge at a first interface, said second peripheral cutting edge adjoining said second radial cutting edge at a second interface; said first and second peripheral cutting edges being separated by first and second spiral flutes, each of said flutes including a relatively large convex surface portion and a relatively small concave surface portion; a first helical primary clearance, said concave surface portion of said first spiral flute adjoining said first helical primary clearance along a line defining said first peripheral cutting edge; a second helical primary clearance, said concave surface portion of said second spiral flute adjoining said second helical primary clearance along a line defining said second peripheral cutting edge; first and second secondary helical clearances adjoining, respectively, said first and second helical primary clearances in trailing positions relative thereto; a first gash inclined with respect to said axis and adjoining said first leading tip surface, said second secondary clearance, said convex portion of said first spiral flute, and said concave portion of said first spiral flute; a second gash inclined with respect to said axis and adjoining said second leading tip surface, said first secondary clearance, said convex portion of said second spiral flute, and said concave portion of said second spiral flute; and said flutes being shallow relative to the diameter of said cylindrical body as measured at said peripheral cutting edges.

Claim 15

A cutting tool comprising: a substantially cylindrical body having a first end, a second end, and a longitudinal axis; a cutting tip defined at said first end of said cylindrical body, said tip including first and second radial cutting edges, each of said radial cutting edges being inclined with respect to said axis; a first leading tip surface, a first primary clearance adjoining said first leading tip surface along a line defining said first radial cutting edge, a second leading tip surface; a second primary clearance adjoining said second leading tip surface along a line defining said second radial cutting edge; a first secondary clearance adjoining said first primary clearance along a trailing edge thereof; a second secondary clearance trailing said second primary clearance along a trailing edge thereof; said first leading tip surface adjoining said trailing edge of said second primary clearance; said second leading tip surface adjoining said trailing edge of said first primary clearance; first and second peripheral cutting edges extending helically about said cylindrical body, said first peripheral cutting edge adjoining said first radial cutting edge at a first interface, said second peripheral cutting edge adjoining said second radial cutting edge at a second interface; said first and second peripheral cutting edges being separated by first and second spiral flutes, each of said flutes including a relatively large convex surface portion and a relatively small concave surface portion; a first helical primary clearance, said concave surface portion of said first spiral flute adjoining said first helical primary clearance along a line defining said first peripheral cutting edge; a second helical primary clearance, said concave surface portion of said second spiral flute adjoining said second helical primary clearance along a line defining said second peripheral cutting edge; first and second secondary helical clearances adjoining, respectively, said first and second helical primary clearances in trailing positions relative thereto; a first gash inclined with respect to said axis and adjoining said first leading tip surface, said second secondary clearance, said convex portion of said first spiral flute, and said concave portion of said first spiral flute; a second gash inclined with respect to said axis and adjoining said second leading tip surface, said first secondary clearance, said convex portion of said second spiral flute, and said concave portion of said second spiral flute; and said flutes being shallow relative to the diameter of said cylindrical body as measured at said peripheral cutting edges.

Claim 16

A cutting tool as defined in claim 13 wherein said first leading tip surface and said first primary clearance form an acute angle therebetween, and said second leading tip surface and said second primary clearance form an acute angle therebetween .

Claim 17

A cutting tool as defined in claim 14 including first and second tertiary clearances adjoining, respectively, said first and second secondary clearances of said radial cutting edges.