Stair climbing wheel chair

Claim 1

AN IMPROVED TYPE OF STAIR CLIMBING WHEEL CHAIR COMPRISING A PAIR OF METAL SUPPORTED, CLOSED CURVE TRACKS ON EACH SIDE OF SAID CHAIR, THE TRACKS IN EACH PAIR HAVING A STRAIGHT GROUND ENGAGING SECTION AND EACH PAIR OF TRACKS BEING ADJUSTABLE VERTIFICALLY AT THREE PLACES TO VERY THE ANGLE BETWEEN SAID STRAIGHT SECTIONS, CLOSED CURVE RIMS WHICH ARE CROSS SECTIONALLY APPROXIMATELY SEMICIRCULAR AND CONCAVE OUTWARD, ONE OF SAID RIMS BEING POSITIONED WITH ITS FRONT END APPROXIMATELY AT THE FRONT OF THE CHAIR AND ITS REAR END AT THE REAR OF THE CHAIR, THE OTHER ONE OF SAID RIM HAVING ITS FRONT END SLIGHTLY FORWARD OF THE REAR OF THE CHAIR, THUS LONGITUDINALLY LAPPING AND BEING LATERALLY SPACED SLIGHTLY FROM THE FIRST DESCRIBED RIM, WITH THE REAR END OF THE SECOND DESCRIBED RIM PROJECTING REARWARDLY FROM THE BACK OF THE CHAIR, SAID FIRST DESCRIBED RIM HAVING AN ARCUATE UPPER SECTION, A LONGITUDINALLY STRAIGHT, GROUND ENGAGING LOWER SECTION, AND SUBSTANTIALLY SEMICIRCULAR END SECTIONS, THE SECOND DESCRIBED RIM HAVING LONGITUDINALLY STRAIGHT UPPER AND LOWER SECTIONS AND SUBSTANTIALLY SEMICIRCULAR END SECTIONS, SAID FRONT SEMICIRCULAR END SECTION OF SECOND DESCRIBED RIM HAVING THE SAME CENTER AND RADIUS AS THE REAR SEMICIRCULAR END SECTION OF THE FIRST DESCRIBED RIM.