Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1981-03-31
1983-06-21
Purser, Ernest R.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
175227, 175107, E21B 402
Patent
active
043889735
ABSTRACT:
A direct drive for a drill bit in a drill string has a fluid-operated motor within a drive section connected by a gear section to a bearing section whose inner tube is coupled to the drill bit to accommodate axial displacement of the drill bit within the outer tube, spring elements are braced against a radial bearing for the inner tube which has at least one axially defined race. The coupling between the inner tube and the gearing also accommodates such axial displacement and a reservoir for oil is located between the drive and gear sections so that oil can be fed to the gearing, the bearings and to an axial bearing in an annular oil-filled space between the drive and gear sections.
REFERENCES:
patent: 2654572 (1953-10-01), Arutunoff
patent: 2990895 (1961-07-01), Works et al.
patent: 3594106 (1971-07-01), Garrison
patent: 3669199 (1972-06-01), Cullen et al.
patent: 4194582 (1980-03-01), Ostertag
patent: 4329127 (1982-05-01), Tschirky et al.
World Oil, Jul. 1978, pp. 84 and 86.
Schulz Horst
Winkelmann Siegfried
Bui Thuy M.
Dubno Herbert
Purser Ernest R.
Ross Karl F.
Zahnradfabrik Friedrichshafen Aktiengesellschaft
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