Bicycle drive system

In a power drive system for a vehicle, the vehicle including conventional frame, front wheels and rear wheels, the power drive system comprising:

• a reversible polarity electromagnetic field positioned in proximity to one wheel of the vehicle;
• at least one permanent magnet mounted on said one wheel for rotation therewith, said permanent magnet positioned to move through the electromagnetic field when said one wheel is rotated;
• and
• reversing switch means responsive to the position of the permanent magnet relative to the electromagnetic field to alternate the polarity of the electromagnetic field when the permanent magnet moves into the center of the electromagnetic field;
• so that upon rotating said one wheel, the permanent magnet actuates the reversing switch means to repeatedly alternate the polarity of the electromagnetic field to alternately attract the permanent magnet into the center of the electromagnetic field and thereafter repel the permanent magnet outwardly from the electromagnetic field to assist in the rotation of the wheel, said vehicle including pedals to rotate said wheels, and further including a proximity switch actuated by each rotation of the pedals for turning off the electromagnetic field, except when the proximity switch is repeatedly actuated by continuing rotation of the pedals, to turn off the power drive system.