Unsegmented rotary rock bit structure and hydraulic fitting

Details Unsegmented rotary rock bit structure and hydraulic fitting Unsegmented rotary rock bit structure and hydraulic fitting

1985-06-17

1986-11-18

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175356, 175358, 175374, 76108A, E21B 1018

Patent

active

046230270

ABSTRACT:
An unsegmented structure for a rotary rock bit is disclosed comprising a one piece body of spring steel wherein individual journal members after being assembled with associated rotary rock cutters are interference fit to the free ends of downwardly directed leaf spring draw bars depending from the lower periphery of the pin end flange, to provide resistance to damage from transcient forces.
A high capacity laminar flow hydraulic system which uses no nozzles delivers drilling fluid to the bore hole bottom and produces a low pressure region at that location via the Bernoulli effect to provide positive chip cleaning and flushing.

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patent: 4266622 (1981-05-01), Vezirian

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