Diamond tipped unitary holder/bit
A unitary bit/holder assembly includes a reverse taper insert having a diamond coated tip mounted thereon that is received in an annular flange forwardmost portion of a holder body. In a modification, the diamond coated tip is received in a recess on a generally cylindrical forwardmost portion of the holder body.
1. A tip assembly for an attack tool comprising:
an HTHP tip including a substrate and a diamond coating on top thereof,
a tungsten carbide insert, and
a steel pad positioned between said tip and said insert.
2. The tip assembly as defined in claim 1 wherein:
a bottom of said tip is brazed to a top of said pad, and
a bottom of said pad is brazed on said tungsten carbide insert.
3. The tip assembly as defined in claim 1 wherein:
said steel pad between said tip and said insert acts as a shock absorber for said assembly.
4. The tip assembly as defined in claim 1 wherein:
said pad includes an axially extending annular rim therearound for retaining braze material between said substrate and said pad.
5. The tip assembly as defined in claim 4 wherein an inner diameter of said annular rim is at least as large as an outer diameter of said pad.
6. The tip assembly as defined in claim 1 wherein said insert includes a hollow cylindrical bore in a top thereof in which said pad is received.
7. The tip assembly as defined in claim 1 wherein said pad covers an entire bottom of said tip.
8. The tip assembly as defined in claim 1 wherein a substantial portion of a bottom of said tip substrate is tungsten carbide.
9. A tip assembly for an attack tool comprising:
a high temperature, high pressure formed tip including a substrate and a diamond coating on the top thereof;
a tungsten carbide insert having a recess on a top thereof; and
a steel pad positioned between said tip and said recess on said insert.
10. The tip assembly as defined in claim 9 wherein:
said steel pad includes a generally cylindrical base, and
an axially extending annular rim extending from a periphery of said pad, an inside diameter of said rim being at least as large as an outer diameter of said base.
11. The tip assembly as defined in claim 4 wherein said pad covers an entire bottom of said tip.
12. The tip assembly as defined in claim 4 wherein a substantial portion of a bottom of said tip substrate is tungsten carbide.