Percussion machine, for example self-propelled ram boring machin

Details Percussion machine, for example self-propelled ram boring machin Percussion machine, for example self-propelled ram boring machin

1992-03-12

1993-08-10

Britts, Ramon S.

Boring or penetrating the earth

Boring without earth removal

173136, E21B 726

Patent

active

052340619

ABSTRACT:
In a percussion mach in particular a self-propelled ram boring machine, with a percussion piston which is axially movable in the machine housing, has a hollow piston rod and is acted on by a pressure medium via a supply hose connected to the rear end of the housing, a piston rod bore communicates with the pressure medium supply when the percussion piston is in the front end position and communicates with a discharge opening when the percussion piston is in the rear end position.

REFERENCES:
patent: 1264318 (1918-04-01), McGrath
patent: 1665046 (1924-10-01), Tucker
patent: 2110331 (1933-07-01), Gartin
patent: 2403582 (1946-07-01), Caudill
patent: 4070948 (1978-01-01), Tkach et al.
patent: 4078619 (1978-03-01), Sudnishnikov et al.
patent: 4708211 (1987-11-01), Shemyakin et al.
patent: 4840237 (1989-06-01), Roemer
patent: 5056608 (1991-10-01), Hemmings

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