| US 7,540,504 B2 | ||
| Step climbing wheelchair | ||
| Mike Ehman, 25 Widez Cres., Weyburn, Sk. 54H 3L5 (Canada); Dennis Mainil, Box 1285, Weyburn 54H 2 L5 (Canada); and Colby Mainil, Box 1285, Weyburn SK 54H 2L5 (Canada) | ||
| Filed on Mar. 09, 2007, as Appl. No. 11/684,421. | ||
| Claims priority of application No. 2560637 (CA), filed on Sep. 22, 2006. | ||
| Prior Publication US 2008/0073863 A1, Mar. 27, 2008 | ||
| Int. Cl. B62B 5/02 (2006.01) | ||
| U.S. Cl. 280—5.2 [280/5.3; 280/5.32] | 18 Claims |
| 1. A step climbing wheelchair apparatus comprising:
right and left axles extending out from rotational axes of corresponding right and left rear wheels of a wheelchair;
right and left lift arms, and a longitudinal slot defined in a middle portion of each lift arm, and a handle on a front end
of each lift arm;
wherein the right and left axles extend through the slots defined by corresponding right and left lift arms, and a fastener
is attached to secure each lift arm on the corresponding axle such that each lift arm can slide longitudinally substantially
perpendicular to the axle from an extended position, where the axle is located at a front handle end of the slot, to a retracted
position where the axle is located at an opposite rear step end of the slot;
wherein the lift arms are configured such that when in the extended position rear step ends of the lift arms are located rearward
of the outer rim of the rear wheel, and the handles are located generally forward of the outer rim of the rear wheel; and
a front lift mechanism comprising a lift wheel and a lift lever operative to push the lift wheel downward to raise the front
caster wheels of the wheelchair.
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