Fluid operated undercutter

Details Fluid operated undercutter Fluid operated undercutter

1977-07-05

1980-02-05

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

Plural below-ground drive prime movers

175267, E21B 106

Patent

active

041868102

ABSTRACT:
An undercutter comprising a slotted tubular body in which is mounted an extendable and retractable cutting head for undercutting a bore into which the tubular body is positioned and rotated. The cutting head includes a fluid-operated reciprocally movable piston, the reciprocating rate of which is determined by an annular liner positioned between the outer wall of the piston body and the inner wall of the piston cavity.

REFERENCES:
patent: 530512 (1894-12-01), Elliott et al.
patent: 789867 (1905-05-01), McCallum
patent: 1750953 (1930-03-01), Boynton
patent: 1777713 (1930-10-01), Braden
patent: 2299718 (1942-10-01), Florez
patent: 2595126 (1952-04-01), Causey
patent: 3316970 (1967-05-01), Huitt et al.
patent: 3361219 (1968-01-01), Sears
patent: 3554302 (1971-01-01), Adkins et al.
patent: 3556233 (1971-01-01), Gilreath et al.
patent: 3583501 (1971-06-01), Aalund
patent: 3817336 (1974-06-01), Sears

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