Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1979-10-04
1982-08-24
Leppink, James A.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
73632, 367108, E21B 4704
Patent
active
043456570
ABSTRACT:
A depth determining device has features for informing the operator of the depth of the cutting tool of a hydraulic drilling machine. The drilling machine is for earth boreing and has a piston carried in a cylinder and secured to a driven kelly. The device has a transducer mounted at the top of the cylinder for transmitting a sound wave through hydraulic fluid to the tap of the piston and detecting the return of the wave at the top of the cylinder. A counter determines the elapsed time for the sound travel. The elapsed time is converted into depth and displayed.
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Felsman Robert A.
Hughes Tool Company
Leppink James A.
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