Logging-while-drilling apparatus

Details Logging-while-drilling apparatus Logging-while-drilling apparatus

1976-03-29

1979-04-03

Purser, Ernest R.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

744245, 175 50, E21B 4700

Patent

active

041472233

ABSTRACT:
A logging-while-drilling apparatus having an asymmetrically efficient drive train for connecting a motor to a signal-generating rotary valve. The drive train includes a transmission which efficiently transmits torque from its input to its output but prevents the transmission of torque from its output to its input whereby the motor is effectively isolated from hydraulic torques produced by the valve.

REFERENCES:
patent: 755051 (1904-03-01), Schmick
patent: 856405 (1907-06-01), Janson
patent: 3705603 (1972-12-01), Hawk
patent: 3789355 (1974-01-01), Patton
Ham, C. W. et al, Mechanics of Machinery, N.Y., McGraw-Hill, 1958, pp. 140-143, and pp. 193-197.

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