Abstract: A cable or other track is supported at points along its length by track support brackets that define and shape the course of the track, providing corners, curves, and other direction changes. A track-traveling element is provided that can travel along the track unimpeded by the track supports. The track support and the track-traveling element are formed to cooperate with each other so that the track-traveling element can pass by the track support brackets without manipulation. The track support has an arcuate arm having a center of curvature and an arm radius defining a circular segment. The track-traveling element has a passageway surrounding the track, a pivoting axis, and a slot communicating with the passageway. The slot is spaced from the pivoting axis by a distance substantially equal to the arm radius of the track support.

Abstract: A cable loop is supported around each corner by a rotatable cable support with horizontal pulleys or other cable engaging device on the ends of spokes around the rotatable cable support, A central cylinder rotatably supported by a vertical rod may support the spokes or a pair of concentric rigid rings with the spokes piercing the rigid rings radially, The outer rigid ring may ride or a circular groove on roller bearings or the inner rigid ring may ride on a vertical rod, On straight cable runs, the trolley with the attached leash rides on a trolley vertical pulley wheel over the cable on the straight sections of the cable, At the corners, the trolley rides with one or two or four additional vertical pulley wheels on a single or double curved track below the rotatable cable support.