Hydropneumatic hammer

Details Hydropneumatic hammer Hydropneumatic hammer

1992-12-14

1994-01-11

Bui, Thuy M.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

E21B 406, E21B 1102

Patent

active

052772640

ABSTRACT:
A hydropneumatic hammer operated by a reciprocal action of a percussive piston and a directional control valve, comprising a piston having steps of larger and smaller diameters separating the interior of a piston chamber intended for admitting said piston into four chambers, a first chamber communicating by way of a first passage with a pressure line, the second chamber being defined by a step of middle portion of said piston connecting to a discharge line, the third one being defined by a step formed on an upper portion of said piston, and the fourth one defining a gas chamber separated from the third chamber by a seal retainer, a valve chamber intended for admitting a valve system, being arranged parallel to said piston chamber, a passage for converting a pressure line of fluid or oil into a discharge line and connecting said valve chamber with the second chamber, a passage for returning an exhausted fluid or oil being converted into depressurized condition after working, a first passage intened for delivering a fluid under pressure from said inlet port into the first chamber, a second passage intended for delivering a fluid under pressure from said inlet port into said valve chamber and self-pressurable chamber, and a passage intended for communicating said valve chamber with the third chamber.

REFERENCES:
patent: 3491838 (1970-01-01), Wilder et al.
patent: 4964477 (1990-10-01), Tupitsyn et al.
patent: 5085284 (1992-02-01), Fu
patent: 5193627 (1993-03-01), Jenne

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