Tandem roller stabilizer for earth boring apparatus

Details Tandem roller stabilizer for earth boring apparatus Tandem roller stabilizer for earth boring apparatus

1976-09-07

1978-03-21

Blix, Trygve M.

Cutlery

175 76, 175406, 308 82, E21B 1710

Patent

active

040800105

ABSTRACT:
The eccentric journals of a tandem roller stabilizer are azimuthally positioned relative to each other by multiple lead threads on the mandrel onto which the journals of the successive roller assemblies are screwed, the journal of each roller assembly having like multiple lead thread of an integral number of turns per lead. In assembling the successive journals on the mandrel each journal is started on the lead immediately adjacent to the lead on which the preceding journal was assembled, progressing continuously in the same direction around the mandrel, whereby each journal is displaced azimuthally from adjacent rollers by an angle x equal to 360
.degree. where n is the thread multiplicity and is equal to the number of roller assemblies on the stabilizer.

REFERENCES:
patent: 1776611 (1930-09-01), Akeyson
patent: 3400773 (1968-09-01), Tiraspolsky et al.
patent: 3413045 (1968-11-01), Wohlfeld
patent: 3754609 (1970-09-01), Garrett
patent: 3933395 (1976-01-01), Evans
patent: 3982594 (1976-09-01), Berthiaume

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