Patent ID: 9341033
Filing Date: 2016-05-17
CPC Classification: E21B

Claim Text:
1. A vertical style riser tensioner assembly comprising: a. a riser mounted through an opening in at least one sliding deck plate and supported by a plurality of roller assemblies disposed around the riser, stabilizing the riser; b. a spider mounted to the riser, the spider providing compressive upper tensile load transfer, the spider comprising: c. a plurality of hydraulic cylinders, each hydraulic cylinder comprising: d. a plurality of hub assemblies, each hub assembly surrounding the barrel of one of the hydraulic cylinders; e. a moving tractor movably mounted to the riser between the spider and one of the sliding deck plates; f. an air gear motor mounted to the riser and connected to the moving tractor for moving individually selectable hydraulic cylinders between an operational location to a maintenance location, wherein the air gear motor is connected to at least one system accumulator that supplies gas to each hydraulic cylinder to extend or retract the cylinder piston rod in the barrel; g. a plurality of pivot arms connected between one of the hub assemblies and a universal pivot assembly which is mounted to one of the sliding deck plates, each pivot arm moving in tandem with the moving tractor for moving the hydraulic cylinders between the operational location and the maintenance location; h. a plurality of upper hubs, each upper hub surrounding the barrel of one of the hydraulic cylinders, to suspend the hydraulic cylinders when the cylinder piston rod is disconnected from the at least one pivoting push beam of the spider; and i. a plurality of disconnectable arms, wherein each disconnectable arm connects between one of the upper hubs of the hydraulic cylinder and the moving tractor, enabling the at least one pivoting push beam of the spider to move enabling the cylinder piston rod to be retracted allowing the hydraulic cylinder to drop down and outward when each pivot arm is swung out without using the moving tractor.