ALEXANDRIA, Va., March 24 -- United States Patent no. 12,584,552, issued on March 24, was assigned to CONN-WELD INDUSTRIES LLC (Princeton, W.va.).
"Elliptical drive" was invented by Gregory K. Harman (Princeton, W.va.).
According to the abstract* released by the U.S. Patent & Trademark Office: "In some examples, an elliptical drive adjusts a phase angle of unbalanced shafts or weights of a vibrating screen. The elliptical drive may include a yoke assembly including four plates that allows relative rotation of two shafts that in turn adjust the phase angle. One of the two shafts may have a pulley drive driven by a motor. The elliptical drive may include two gears intermeshed with each other hand having respective hubs with helical splines ...