Ram boring machine

Details Ram boring machine Ram boring machine

1996-12-06

1999-08-17

Neuder, William

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175297, E21B 414

Patent

active

059379561

ABSTRACT:
A ram-boring machine with forward and reverse motion control which comprises a percussion piston that can be axially displaced in a tubular housing, a control tube that is arranged in the housing and controls the forward and reverse motion of the percussion piston by passing over radial control openings in the percussion piston, control edges on the control tube which are guided in the percussion piston in sealed fashion, a compressed air bore that runs into the front end of the control tube, a compressed air bore or compressed air line that runs into an annular chamber between a first control edge and a second control edge, an outlet bore or outlet line that originates in the region between the second control edge and a third control edge and leads to the rear end of the control tube, and control means for selectively charging the compressed air bore or compressed air line or ventilating the outlet bore or outlet line.

REFERENCES:
patent: 5564510 (1996-10-01), Walter
patent: 5803188 (1998-09-01), McInnes
patent: 5816342 (1998-10-01), Prater, Jr. et al.

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