Patent attributes
A petroleum extraction pump deploying a sucker rod has an actuator for rotating the portion of the rod in the stuffing box on every stroke to minimize local wear. The rotor handle or arm of the actuator is triggered by an upright roller supported by a an upright rigid linear member, such as a post or tube, that is spaced apart from the well bore by a clamp attached to the main well pipe or stuffing box. The roller rotates with each stroke as it engages the rotator handle. The roller is supported by a Y-shaped saddle to avoid catching on the upstroke of the pumping unit should these member become laterally separated. The device is capable of retrofitting to an existing sucker rod actuator by eliminating a cable to the arm of the actuator and deploying an arm stop member to support the handle in a horizontal orientation until it contacts the roller.