Positive lock of a drive assembly

Details Positive lock of a drive assembly Positive lock of a drive assembly

1989-07-14

1991-01-01

Watts, Douglas D.

Tool driving or impacting

Means to drive tool about an axis

Means to hold and relatively rotate sections of tool shaft

E21B 300

Patent

active

049811800

ABSTRACT:
A positive lock for a drive assembly joint. In a top driven drilling machine, the motor for rotating the drill string is threadably connected to a drill pipe by the drive assembly. The lock eliminates the need for overtorquing and prevents loosening of the drive assembly joint when using the motor to break the connection between the drive assembly and the drill pipe. The lock also prevents tightening or damage to the joint during drilling. Costs and maintenance associated with an upper wrench are eliminated since the upper wrench is no longer required for making and breaking pipe connections.

REFERENCES:
patent: 3901330 (1975-08-01), Slator et al.
patent: 3964552 (1976-06-01), Slator
patent: 4529045 (1985-07-01), Boyadjiett et al.
patent: 4570706 (1986-02-01), Pugnet
patent: 4605077 (1986-09-01), Boyadjieff
patent: 4660634 (1987-04-01), Johnson, Jr.
patent: 4781359 (1988-11-01), Matus

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