ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,404,637, issued on Sept. 2, was assigned to Volvo Construction Equipment AB (Eskilstuna, Sweden).

"Amplitude adjustment mechanism for a vibratory mechanism of a surface compaction machine" was invented by Fares Beainy (Mechanicsburg, Pa.), Maciej Karcz (Loslow, Poland) and Lukasz Rembisz (Medlow, Poland).

According to the abstract* released by the U.S. Patent & Trademark Office: "An adjustment mechanism for a vibratory mechanism of a surface compaction machine, the adjustment mechanism includes a torque limiter coupled between the first eccentric shaft and the second eccentric shaft that prevents relative rotation between the shafts and a phase adjustment between the shafts when a ne...