Patent ID: 7219755

Claim:
A wheelchair for traversing obstacles, comprising: (a) a frame: (b) a pivoting assembly having at least one pivot arm, said at least one pivot arm comprising (i) a first portion pivotally coupled to said frame; and (ii) a second portion having at least one front caster attached thereto for normally contacting a supporting surface of the wheelchair; (c) a drive assembly coupled to a third portion of said at least one pivot arm; (d) a rear caster coupled to said frame; wherein said at least one pivot arm pivots in response to a moment generated by the drive assembly thereby urging said at least one front caster from said supporting surface to assist said wheelchair in traversing said obstacles; and wherein said at least one pivot arm pivots in response to a moment generated by the drive assembly to raise said at least one front caster between one and six inches from said supporting surface.