Underreamer cutter arm

Details Underreamer cutter arm Underreamer cutter arm

1975-02-21

1976-04-13

Leppink, James A.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by longitudinally relatively movable...

E21B 926

Patent

active

039498204

ABSTRACT:
A hole drilling tool, useful in mining operations for enlarging the lower portion of a hole for explosives, is described. This underreamer has arms movable between a retracted position and an extended position for underreaming in response to weight of the drill string above the tool. The two cutter arms are urged outwardly into their extended position by a cam connected to the upper end of the drill string. In effect the cutter arms are connected to the lower end of the drill string which can telescope relative to the upper end. An air flow passage extends from the tool body through the cutter arms for cooling the cutter bearings.

REFERENCES:
patent: 384625 (1888-06-01), Herberg
patent: 2069482 (1937-02-01), Seay
patent: 2177721 (1939-10-01), Johnson et al.
patent: 2344598 (1944-03-01), Church
patent: 3552509 (1971-01-01), Brown
patent: 3749187 (1973-07-01), Leathers
patent: 3817339 (1974-06-01), Furse

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