ALEXANDRIA, Va., March 3 -- United States Patent no. 12,565,248, issued on March 3.
"Multiple line compression spring dampening system" was invented by Michael Troy Richardson (Washington, Utah) and Michael Timothy Holder (Whitesburg, Ga.).
According to the abstract* released by the U.S. Patent & Trademark Office: "For stopping a zip line trolley, a zip line braking system includes an impact device, a non-zip liner parallel cable, a freewheeling pulley, a tether, and at least one spring. The impact device rides on a zip line cable, wherein the impact device is positioned down the zip line cable from a zip line trolley that rides on the zip line cable. The impact device does not ride on the non-zip liner parallel cable. The tether connects...