Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1978-05-08
1980-03-18
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175 53, 175372, E21B 908
Patent
active
041934644
ABSTRACT:
A removable shirttail of an earth boring tool, such as a hole opener, protects the seals and bearings of an associated cutter. In one embodiment, the shirttail attaches to a journal or mounting shaft of the cutter by threaded fasteners. In an alternate embodiment, different threaded fasteners that attach the journal to an associated leg of the tool cooperate with the cutter and the leg to clamp the shirttail between the journal and the leg. A wedge-shaped boss of the shirttail faces the wall of the bore being opened. A V-shaped saddle in the boss receives a complementary lug of the journal. The lug of the journal also mates with a complementary notch of the leg to prevent journal rotation. The removal of the theaded fasteners that attach the journal to the leg allows spacers or shims to be withdrawn, which in turn permits the cutter, journal, and shirttail to be moved along the journal axis to clear a nose of the journal from a bore in a central body of the tool. The cutter, journal, and shirttail can then be lifted from the tool. Removed, the shirttail can be replaced, and seals and bearing of the cutter assembly inspected without the renewal of other parts of the cutter assembly or yoke.
REFERENCES:
patent: 930758 (1909-08-01), Hughes
patent: 1995388 (1935-03-01), Howard
patent: 2030722 (1936-02-01), Scott
patent: 2044549 (1936-06-01), Scott
patent: 2103583 (1937-12-01), Howard et al.
patent: 2107626 (1938-02-01), Catland
patent: 2203998 (1940-06-01), O'Grady
patent: 4036314 (1977-07-01), Dixon et al.
Favreau Richard E.
Leppink James A.
Smith International Inc.
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