Ram boring implement having a movable bit

Details Ram boring implement having a movable bit Ram boring implement having a movable bit

1988-03-28

1989-12-12

Dang, Hoang C.

Boring or penetrating the earth

Boring without earth removal

173 91, 173132, 173133, 173136, 175 92, 175296, E21B 414

Patent

active

048861286

ABSTRACT:
A ram boring implement having a pneumatically or hydraulically driven percussion piston, movable axially in a reciprocating manner in a housing, and an axially movable bit which is connected to an end of the housing and acted upon directly or indirectly by the percussion piston, is of a structure which permits a restoring piston, connected to the bit, to be acted upon by the pneumatic or hydraulic pressure during the return stroke of the percussion piston.

REFERENCES:
patent: 450782 (1891-04-01), Laun
patent: 520915 (1894-06-01), Clouteau
patent: 1416086 (1922-05-01), Wolfe
patent: 1665046 (1928-04-01), Tucker
patent: 3266581 (1966-08-01), Cooley et al.
patent: 3865200 (1975-02-01), Schmidt
patent: 4018291 (1977-04-01), Anderson
patent: 4366868 (1983-01-01), Salmi
patent: 4624325 (1986-11-01), Steiner

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