In-hole motor drill with locking bit clutch

Details In-hole motor drill with locking bit clutch In-hole motor drill with locking bit clutch

1979-08-20

1981-10-20

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

With positive connection between tool and support shaft for...

175107, E21B 312

Patent

active

042955351

ABSTRACT:
An in-hole motor drill assembly has the rotor of the motor connected to the drill bit and a housing connected to the running string, and normally disengaged torque transmitting members between said housing and said drill bit provide for engaging said bit and running string for mutual rotation, by pulling on the running string. The torque transmitting members are locked in engagement, enabling the tension on the drill pipe string to be relieved, and the bit can be rotated by rotation of the drill pipe string in either direction. The usual pick-up bearing between the housing and the shaft provides an abutment for a releasable thrust transmitting member which normally holds the clutch disengaged.

REFERENCES:
patent: 1727276 (1929-09-01), Diehl
patent: 2167019 (1939-07-01), Yost

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