Patent ID: 7419182

Claim:
A wheelchair comprising: a first assembly that includes; a seat frame; a stop connected to the seat frame; a front caster assembly fixed for movement with the seat frame; a second assembly that includes; an axle tube; a pair of drive wheels connected at opposite ends of the axle tube; a rear caster arm fixed to the center of the axle tube such that the axle tube and the rear caster arm form a “T ” shape; a rear caster connected to the rear caster arm; a pivot arm fixed to the axle tube and extends rearward from the axle tube; a pivot joint that connects the pivot arm to the first assembly; wherein the first assembly pivots with respect to the second assembly to raise the front caster from a supporting surface of the wheelchair; and wherein the pivoting of the first assembly with respect to the second assembly is limited by engagement of the first assembly with the stop.