Torque transmitting device for rotary drill bits

Details Torque transmitting device for rotary drill bits Torque transmitting device for rotary drill bits

1998-09-22

2000-08-08

Bagnell, David

Boring or penetrating the earth

With tool shaft detail

464 20, 464 76, 464 86, E21B 1704

Patent

active

06098726&

ABSTRACT:
A torque transmitting device for use with a rotary drill bit connected to a drill collar, comprises a first member connected to the drill collar, a second member connected to the drill bit, and coupling means connecting the two members together for rotation about a common central axis. The coupling means permits limited relative rotation between the members about the axis, but provides a resistance to rotation of the first member relative to the second member in a forward drilling direction which is greater than its resistance to relative rotation in the reverse direction. The comparatively lower resistance to rotation in the reverse direction prevents momentary reverse rotation of the drill collar, due for example to torsional oscillations, being transmitted to the drill. bit. This reduces the likelihood of damage to the cutters on the drill bit, which might otherwise result from such momentary reverse rotation of the bit.

REFERENCES:
patent: 2740651 (1956-04-01), Ortloff
patent: 3033011 (1962-05-01), Garrett
patent: 3265091 (1966-08-01), Jarnett

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