Patent attributes
A zip line trolley includes a frame assembled from a pair of spaced-apart parallel side plates and an inner beam, which is partially sandwiched between the side plates. The inner beam has a gallery of block-T-shaped cross section which extends its length. A shackle, from which a rider is suspended, can be pinned anywhere within the gallery. A main pulley, which is installed in an upper middle portion of the frame, rotates on a pair of sealed ball bearing races that are pressed on a hollow keyed shaft which slides into opposed grooves machined into each of the side plates. The keyed shaft is bolted between the side plates with a shoulder bolt passing transversely through both side plates. A water-wiping brake pad is pivotally mounted within the frame in front of the main pulley. A bumper is bolted between front portions of the side plates.
