Ram boring machine

Details Ram boring machine Ram boring machine

1990-02-01

1992-09-22

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

173 91, E21B 414

Patent

active

051488787

ABSTRACT:
A ram boring machine having a striking piston that is axially displaceable in a housing, of which the forward and backward movement is controlled by a control sleeve connected to a supply hose and which engages in a cylinder chamber of the striking piston, and by one or more corresponding control openings in the striking piston, wherein the control sleeve is loaded both axially and torsionally, has axial and rotational stops and is rotatable and axially displaceable in a guide sleeve arranged at the rear end of the housing.

REFERENCES:
patent: 4078619 (1978-03-01), Sudnishnikov et al.
patent: 4295533 (1981-10-01), Schmidt
patent: 4537265 (1985-08-01), Cox et al.
patent: 4662457 (1987-05-01), Bouplon
patent: 4683960 (1987-08-01), Kostylev et al.
patent: 4819741 (1989-04-01), Terskov et al.
patent: 4840237 (1989-06-01), Roemer

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