Patent ID: 7775529

Claim:
An axle suspension system for mounting a wheel to a frame for transport of the frame over a support surface, said axle suspension system comprising: a tower adapted to be attached to the frame; an axle unit associated with said tower, said axle unit including a truck, an axle connected to said truck and adapted to be attached to the wheel, and a mounting member connected to said truck and operatively connected to said tower; one or more guide assemblies operatively connecting said tower to said truck of said axle unit such that said tower is selectively moveable with respect to said axle unit, said guide assemblies providing guidance to said tower as said tower moves relative to said axle unit, each said guide assembly comprising a guide member having a first flange and a spaced apart and generally parallel second flange, each said flange extending generally linearly between a first end and a second end; whereby said tower is adapted to be selectively moved with respect to said axle unit between a retracted position and an extended position to thereby selectively position the frame with respect to the support surface.