Underreamer having splined torque transmitting connection betwee

Details Underreamer having splined torque transmitting connection betwee Underreamer having splined torque transmitting connection betwee

1976-10-27

1977-10-25

Purser, Ernest R.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by cam or gear axially rotatable...

175286, 175321, E21B 926

Patent

active

040552268

ABSTRACT:
An underreamer is disclosed having longitudinally telescoping upper and lower portions connectable respectively to an upper drill string and a lower drill string. A splined connection is provided between the telescoping portions having first and second engaged positions. Both of the engaged positions transmit torque between the telescoping portions. The splined connection provides a different angular and a different longitudinal position for the telescoping portions in each such position. Means is provided for pivotally mounting a cutter arm on one of the telescoping portions. Means is provided on the other telescoping portion for urging the at least one cutter arm relatively outward from the telescoping portions to an extended underreaming position when the splined connection is in its first position. The cutter arm is positioned inwardly to a retracted clearance position when the splined connection is in its second position.

REFERENCES:
patent: 1743528 (1930-01-01), Campbell
patent: 1810201 (1931-06-01), Campbell
patent: 2002140 (1935-05-01), Dillon
patent: 2400970 (1946-05-01), Baker
patent: 3324952 (1967-06-01), Berryman
patent: 3352362 (1967-11-01), Leebourg
patent: 3749187 (1973-07-01), Leathers
patent: 3817339 (1974-06-01), Furse
patent: 3949820 (1976-04-01), Furse

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