(under subclass 143) Apparatus wherein one of the distal
wheels is selectively secured in various positions closer to or farther away from the other wheel.
(1) Note. This subclass includes structure wherein an extension member is secured to one end of a wheel carrying frame to elongate such frame.
SEE OR SEARCH THIS CLASS, SUBCLASS:
120+, for a frame carried flexible track wherein the frame is formed in sections which are adjustable relative to each other to maintain track tension.
126, wherein the intermediate support includes wheel contacting upper and lower track runs.
SEE OR SEARCH CLASS
474, Endless Belt Power Transmission Systems or Components, 101+, for means for adjusting belt tension or for shifting belt, pulley, or guide roll.
