Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1980-05-27
1982-05-11
Purser, Ernest R.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
E21B 1024
Patent
active
043288731
ABSTRACT:
An automatic depth compensating system is provided for controlling the pressure in a volume such as the interior of a rotary drill bit in response to pressure changes in the environment adjacent to the volume. The system comprises at least one pressure compensating device positioned between the volume and the environment for changing the pressure in the volume in response to pressure changes in the environment. The system further includes a pressure surge compensating device which is positioned between the volume and the environment for compensating for positive and negative pressure surges when the pressure in the volume changes relative to the pressure in the environment. The pressure compensating devices each comprises differential piston devices having a spring for biasing the differential piston and the pressure surge compensating device comprises a cylinder, a piston positioned in the cylinder and forming a chamber therein and first and second check valves for opening in response to predetermined pressure differentials between the environment and the interior of the volume.
REFERENCES:
patent: 3244459 (1966-04-01), Ortloff
patent: 3303898 (1967-02-01), Bercaru
patent: 3844364 (1974-10-01), Crow
patent: 3866695 (1975-02-01), Jackson
patent: 4154312 (1979-05-01), Barnetche
patent: 4254838 (1981-03-01), Barnetche
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