Underreaming tool with overriding extended arm retainer

Details Underreaming tool with overriding extended arm retainer Underreaming tool with overriding extended arm retainer

1976-03-19

1978-05-30

Purser, Ernest R.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by longitudinally relatively movable...

175290, 175322, E21B 930

Patent

active

040918831

ABSTRACT:
An underreamer includes a mounting member and a plurality of cutter arms. Means pivotally mounts the cutter arms on the mounting member. Overridable means is operable for holding the cutter arms relatively outward in an underreaming position. The overriding means is operable to allow the cutter arms to move relatively inward upon forces on the cutter arms above a predetermined level.

REFERENCES:
patent: 2809016 (1957-10-01), Kammerer, Jr.
patent: 3749187 (1973-07-01), Leathers
patent: 3817339 (1974-06-01), Furse

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