Self propelled reversible boring ram

Details Self propelled reversible boring ram Self propelled reversible boring ram

1983-04-22

1985-08-27

Novosad, Stephen J.

Boring or penetrating the earth

Boring without earth removal

175296, 173 91, E21B 414, E21B 726, E21B 1102

Patent

active

045372659

ABSTRACT:
A reversible boring ram having a tubular body containing a reciprocable hammer is provided with a pneumatically balanced control member which allows the direction of operation of the ram to be reversed without halting the hammer's reciprocation. The pneumatically balanced control member also allows easy starting of the device.
The control member includes a balance piston situated in a balance cylinder which is attached to the body of the ram, the balance cylinder being connected to an inlet channel in such a manner that forward pressure on the balance piston counteracts the backward pressure in the main cylinder. The control member may be spring biased into the position for forward motion.

REFERENCES:
patent: 962350 (1910-06-01), Hibschle
patent: 3519234 (1970-07-01), Matson
patent: 3727701 (1973-04-01), Sudnishnikov
patent: 3744576 (1973-07-01), Sudnishnikov

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