Abstract
Steps on roads are the big problem for wheelchair travelling. The mechanical improvements of caster structure for surmounting these steps seem to be effective. This paper describes about the successful results of step surmounting experiments with three caster support mechanisms. The swing type caster has a link between a yoke and a wheel axle. This link raises the load by swing motion. The lever type caster has a lever with a caster wheel and an auxiliary wheel. The leverage effect raises the load. The link type caster has a toggle link mechanism which enlarges the lifting force to the load.
