Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent
1991-11-26
1992-12-22
Bui, Thuy M.
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
175428, E21C 1300
Patent
active
051727790
ABSTRACT:
A chisel insert for rolling cone rock bits is disclosed in which the crest of the insert has a "dog bone" shape by being rounded with the crest ends flaring out to a larger dimension than the middle thereof. The crest is also convex upwardly along its median line thereby making a shorter moment arm at the ends of the crest.
REFERENCES:
patent: 3442342 (1969-05-01), McElya et al.
patent: 4254840 (1981-03-01), Shay, Jr.
patent: 4705124 (1987-11-01), Abrahamson et al.
patent: 4940099 (1990-07-01), Deane et al.
Cawthorne Chris E.
Minikus James C.
Portwood Gary R.
Siracki Michael A.
Bui Thuy M.
Smith International Inc.
Vargo Robert M.
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