Pneumatically operated ram borer

Details Pneumatically operated ram borer Pneumatically operated ram borer

1980-03-13

1981-10-20

Pate, III, William F.

Boring or penetrating the earth

Boring without earth removal

91 19, 91 20, 175103, 173 91, E21B 1102

Patent

active

042955335

ABSTRACT:
A self-driven pneumatically operated ram borer for boring holes in the ground includes a casing containing a percussion piston and a control sleeve for controlling the supply of compressed air through a hose to cause the piston to reciprocate, is provided with a control tube which is rotatable to vary the porting of the borer to cause it to move either forwards or rearwards. The tube is rotated into either a forward position or a reverse position by means of a flexible shaft which extends from the casing within the hose. By enclosing the shaft within the hose, the shaft is protected and is not subject to friction against the wall of the hole bored by the borer or to jamming if the hole collapses. The borer can thus easily be controlled even when it has passed through a very long bore hole.

REFERENCES:
patent: 998477 (1911-07-01), Duvall et al.
patent: 1965064 (1938-07-01), Zwayer
patent: 3651879 (1972-03-01), Sudnishnikov et al.
patent: 3756328 (1973-09-01), Sudnishnikov
patent: 4114700 (1978-09-01), Tkach et al.

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