Fatigue resistant anvil bit for percussion rock drill

Details Fatigue resistant anvil bit for percussion rock drill Fatigue resistant anvil bit for percussion rock drill

1975-03-10

1976-04-27

Murtagh, John E.

Boring or penetrating the earth

Below-ground impact members

173 80, 173131, 175389, 175410, 403273, E21B 106, E21B 922

Patent

active

039528197

ABSTRACT:
A fatigue resistant anvil bit is described for use on a percussion rock drill. The anvil bit has a shank having a substantially uniform cross section terminated in a threaded end portion. A bit head is threadably mounted on the end portion having a diameter substantially greater than the bit shank. An anvil ring is shrunk fit on the shank engaging the bit head to provide lateral support and minimize the creation of fatigue fractures.

REFERENCES:
patent: 58650 (1866-10-01), King
patent: 1477855 (1923-12-01), Thurston
patent: 2239461 (1941-04-01), Mann
patent: 2569275 (1951-09-01), Baker
patent: 2673715 (1954-03-01), Baker
patent: 2759705 (1956-08-01), Bjorkman
patent: 2942578 (1960-06-01), Huffman et al.
patent: 3061025 (1962-10-01), Stockard
patent: 3322216 (1967-05-01), Kurt

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