US 12,234,710 B2
Drive assembly for a well site
Vern Hult, Calgary (CA); Benjamin J Gagnon, Calgary (CA); Emery Stoesser, Calgary (CA); and Bernard Lumori, Calgary (CA)
Assigned to EVOLUTION OIL TOOLS INC., Calgary (CA)
Filed by EVOLUTION OIL TOOLS INC., Calgary (CA)
Filed on Dec. 19, 2022, as Appl. No. 18/067,976.
Claims priority of provisional application 63/291,177, filed on Dec. 17, 2021.
Prior Publication US 2023/0193717 A1, Jun. 22, 2023
Int. Cl. E21B 43/12 (2006.01); E21B 33/04 (2006.01)
CPC E21B 43/126 (2013.01) [E21B 33/0415 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A drive assembly for a tubing rotator or a chemical pump, the drive assembly comprising: a linear force to motive force convertor including an input structure for receiving a linear motion drive force and an output structure for outputting a motive drive force, an arm for receiving a linear drive force and inputting it to the linear force to motive force convertor and an actuator couplable to a polish rod and configured for transmitting linear movement of the polish rod to the arm, wherein the arm includes a lever connected for operation around a fulcrum and a linear force transmission shaft pivotally connected between the lever and the linear force to motive force convertor, wherein an end of the lever is positioned to be acted upon by the actuator and the shaft is connected on a load end of the lever and further comprising a biasing member to bias the load end of the lever into a lower position and wherein the linear force to motive force convertor outputs the motive drive force when the linear force transmission shaft is pushed down by the lever and the lever is biased by the biasing member to return to an uppermost position.