Importance

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Abstract

The present invention is a piston-actuated bicycle pedal assist system mounted to a bicycle for intermittent assistance with pedaling. This system includes a pedal rotatably attached to a pedal arm. The pedal arm fixedly attaches to a crankshaft such that rotation of the pedal arm and continuous movement of a piston head actuate the crankshaft. A propellant bottle provides propellant flow through propellant tubing. A propellant actuator controls propellant flow into at least one manifold connected to at least one propellant motor cylinder. This manifold includes a check valve that permits one-way propellant flow into the propellant motor cylinder. The check valve alternately opens by the piston head and seals automatically. The piston head includes a piston flap seal reversibly forming a seal that creates a pressure differential within a propellant motor cylinder chamber. This pressure differential controls downward movement of the piston head and an attached piston shaft.

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First Claim