Patent ID: 7537066
Filing Date: 2009-05-26
Classification: E21B

Abstract:
1. A automatic driller for controlling a rotating primary mover wherein the automatic driller comprises: a. a first housing; b. a manual brake handle comprising a stroke; c. a swivel bracket connected to the manual brake handle; d. a first elastic means engaging the first housing and the swivel bracket; wherein the first elastic means applies a first tension to the manual brake handle; e. a second elastic means engaging the swivel bracket for applying a counter tension to the manual brake handle; f. an extension rod comprising a first end and a second end, wherein the first end is connected to the second elastic means; g. a fulcrum assembly connected to the second end of the extension rod; h. an adjustment stem assembly is connected to the fulcrum assembly, wherein the adjustment stem is adapted to adjust the fulcrum assembly by increasing or decreasing the counter tension in the second elastic means, forming a set point within an effective stroke of the manual brake handle; i. wherein the counter tension maintains the manual brake handle at the set point; and j. wherein the effective stroke is proportional to a rotational velocity of a rotating primary mover connected to a piece of drilling equipment, and wherein the effective stroke causes the rotating primary mover to increase, decrease, or stop the motion of a piece of drilling equipment.