A device intended to change the wheel of a self-propelled car to be used on rough roadways and approximate towards the smoothness in running of a wheel on a metal track. The tread is made of several rubberized shod feet that are linked by ball-and-socket bones towards stops of sliding spokes. Each spoke has actually attached with it a tiny roller that its change works under a short pivoted train managed by a strong group of springs. This arrangement allows your toes to accomodate by themselves to obstacles also such as for instance measures or stairs. The pedrail was devised by one B. J. Diplock of London, Eng.
an automobile, as a traction engine, having such pedrails.
A form of traction-engine, therefore built your wheels sleep their weight not on the ground-surface but on products or links of a jointed chain, provided in front of the machine because it advances, and laid by it on the ground for wheels to run on.