Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1979-07-24
1981-03-10
Pate, III, William F.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
138 31, 184 39, E21B 1022
Patent
active
042548381
ABSTRACT:
An automatic depth compensating device is provided for controlling pressure in a volume in response to pressure changes in an environment adjacent to the volume. The compensating device comprises a cylinder which includes a first bore having a first cross-sectional area and a second bore having a second cross-sectional area, the first and second bores being axially aligned with one another. A first piston having a first surface area is slidably positioned in the first bore and a second piston having a second surface area is slidably positioned in the second bore. The first and second surface areas are different from one another. A coupling rigidly couples the first and second pistons together so that the first and second pistons move together. Another aspect of the present invention is the incorporation of the above-described automatic depth compensating device as an improvement in a rotary drill.
REFERENCES:
patent: 3244459 (1966-04-01), Ortloff
patent: 3251634 (1966-05-01), Onreing
patent: 3467146 (1969-09-01), Harson
patent: 3675729 (1972-07-01), Nelson
patent: 4170441 (1979-10-01), Trzecick
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