Underreamer with cylindrical boss and socket hinge assembly for

Details Underreamer with cylindrical boss and socket hinge assembly for Underreamer with cylindrical boss and socket hinge assembly for

1981-12-07

1984-07-24

Leppink, James A.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

E21B 1032

Patent

active

044613610

ABSTRACT:
An underreamer having a plurality of drilling arms hingedly attached to a tubular body for movement between a retracted position and an extended position for drilling. The hinge attachment includes a cylindrical boss and socket assembly, between the arm and a removeable hinge plate retained in a recess in the body against outward movement by an engaging key and keyway between the plate and wall of the recess.

REFERENCES:
patent: 3233277 (1966-02-01), Hirashiki
patent: 3425500 (1969-02-01), Fuchs
patent: 3483934 (1969-12-01), Fuchs
patent: 3749187 (1973-07-01), Leathers
patent: 3750771 (1973-08-01), Cugini
patent: 4187920 (1980-02-01), Johnson
patent: 4190124 (1980-02-01), Terry
patent: 4282941 (1981-08-01), Perkin
patent: 4282942 (1981-08-01), Longmore

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