Patent ID: 7311035
Filing Date: 2007-12-25
Classification: E21B

Abstract:
1. A junction plate actuator apparatus comprising: a. a cylinder comprising a wall, a first fluid region, a first fluid port in the wall located at the first fluid region, a second fluid region, a second fluid port in the wall at the second fluid region, a longitudinal channel extending through a central radial region of the first and second fluid regions, a first face at the end of the first fluid region and a second face at the end of the second region; b. a first fluid line coupled to the first fluid port; c. a second fluid line coupled to the second fluid port; d. a piston extending through the central channel of the cylinder and comprising a distal end protruding beyond the first or second fluid region of the cylinder, a proximal end protruding beyond the fluid region of the cylinder opposite the region from which the distal end protrudes, and a threaded longitudinal channel; e. a diaphragm mounted on the piston and sized such that it extends radially outward from the outer surface of the piston to the cylinder wall; f. a screw member comprising a threaded region rotatably mounted in the central longitudinal channel of the piston, a distal region extending beyond the distal end of the piston and adapted to be connectable to a junction plate, a proximal region extending beyond the proximal end of the piston, and a longitudinal spline receptacle; and g. a drive spline having a distal section inserted in the spline receptacle of the screw member such that rotation of the spline member causes rotation of the screw member, and a proximal section opposite the distal section comprising a coupling member attached to the end of the proximal section.