Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1979-01-15
1981-05-12
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175371, 76108A, 308 82, E21B 1020
Patent
active
042666228
ABSTRACT:
A rotary rock bit is described having a one piece bit body with a plurality of legs extending downwardly therefrom. Each leg includes an annular bore extending therethrough for receiving the mounting end of a separate journal pin. Each journal pin also includes a bearing end for rotatively supporting a cone type cutter. Cone retention members are operatively engaged to each journal pin for retaining the cone cutter on each journal pin. In assembly the cone cutters, with the retention members contained therein, are positioned interior of the legs of the one piece bit body in their operative location. The journal pins are then inserted through the leg bores until they extend into the cavities of the respective cone cutters. Each journal pin is then secured to a respective leg and the retention members are secured to the journal pins, preferably by electron beam welding techniques.
REFERENCES:
patent: 2490151 (1949-12-01), Noble et al.
patent: 3239431 (1966-03-01), Knapp
patent: 4043411 (1977-08-01), Lichte
patent: 4098150 (1978-07-01), Penny et al.
patent: 4127043 (1978-11-01), Evans
patent: 4154094 (1979-03-01), Vezirian
patent: 4157122 (1979-06-01), Morris
Favreau Richard E.
Leppink James A.
Smith International Inc.
Vargo Robert M.
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