Patent ID: 8657319

Claim:
A propulsion system comprising an axial track plate having a plurality of track paths; said track paths having a plurality of slope sections; a caliper element to enable movement of a wheel from a first position to a second position; said caliper element being responsive to slope sections such that said slope sections can engage or disengage said caliper element with a circular member enabling said wheel to rotate; said caliper and track plate each having a broad face; said caliper element's broad face being parallel to said track plate's broad face; said face being perpendicularly connected to each other via a plurality of pegs disposed along said track paths; said caliper element disposed such that it moves in a substantially concentric path with respect to the center of said wheel, said caliper element having a mating surface enabled to engage with a circular member and rotate it; said circular member being connected to a wheel hub such that it enables said wheel to rotate while said circular member is engaged.