Boring or penetrating the earth – Boring without earth removal
Patent
1976-07-30
1978-03-14
Purser, Ernest R.
Boring or penetrating the earth
Boring without earth removal
173 91, E21B 1102
Patent
active
040786196
ABSTRACT:
The apparatus consists of a hollow body wherein there is contained a striker which divides the space inside the body into a forward operating chamber and a rear exit chamber. The striker is provided with ports for admitting compressed air into the forward operating chamber and for allowing the emission of spent air from the chamber. The striker is also provided with an interior space, the rear end face of said striker being left open. Said hollow body includes passages and a pipe for placing said interior space of said striker in communication with a source of compressed, the pipe being positioned for longitudinal travel relative to the body. For holding fast the pipe in its extreme positions and for determining the direction of movement, which can be either forward or in reverse, the apparatus is provided with a means in the form of a member which exerts radial springy action, is of annular cross section and is disposed inside the body of the apparatus, one of the surfaces of the springy member being exposed to the pressure of compressed air and the other to the pressure of the surrounding medium.
REFERENCES:
patent: 1988397 (1935-01-01), Reed
patent: 2457052 (1948-12-01), LeClair
patent: 3137483 (1964-06-01), Zinkiewicz
patent: 3651874 (1972-03-01), Sudnishnikov et al.
patent: 3727701 (1973-04-01), Sudnishnikov et al.
patent: 3865200 (1975-02-01), Schmidt
patent: 3952813 (1976-04-01), Chepurnoi et al.
Kamensky Veniamin Viktorovich
Kostylev Alexandr Dmitrievich
Sudnishnikov Boris Vasilievich
Terskov Alexei Danilovich
Tupitsyn Konstantin Konstantinovich
Favreau Richard E.
Purser Ernest R.
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