Hydraulically operated subsoil displacement apparatus

Details Hydraulically operated subsoil displacement apparatus Hydraulically operated subsoil displacement apparatus

1995-01-10

1996-04-30

Tsay, Frank S.

Boring or penetrating the earth

Boring without earth removal

175296, 173 91, 173126, E21B 414

Patent

active

055116264

ABSTRACT:
A hydraulically operated mole has a reciprocating hammer operated by means of an impact mechanism which may be readjusted from forward to backward wiring by displacement of a valve tube secured to a piston near the rear end of the apparatus. The piston is activated by the switching of oil supply and withdrawal respectively to the tank between two pipeline stubs at the rear end of the apparatus. The fluid connections between the stubs and the piston are completely separated as regards the flow. As a result, complicated and vulnerable valve elements used in known hydraulic moles are avoided.

REFERENCES:
patent: 3796271 (1974-03-01), Amtsberg
patent: 3903972 (1975-09-01), Bouyoucos et al.
patent: 4144941 (1979-03-01), Ritter
patent: 4596292 (1986-06-01), Crover
patent: 4953626 (1990-09-01), Puttmann et al.
patent: 5056608 (1991-10-01), Hemmings
patent: 5096000 (1992-03-01), Hesse
patent: 5318135 (1994-06-01), Kayes
patent: 5337837 (1994-08-01), Wentworth et al.

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