Bicycle drive

Claim 1

A BICYCLE INCLUDING FRONT AND REAR GROUND ENGAGING WHEELS, A FRAME SUPPORTED BY SAID WHEELS, AN OBLONG PEDAL ACTUATED DRIVE WHEEL HAVING MAJOR AND MINOR DIMENSIONS, AN ENDLESS MEMBER DRIVEN BY SAID OBLONG WHEEL AND HAVING UPPER AND LOWER RUNS EXTENDING REARWARDLY THEREFROM, A PLURALITY OF ADDITIONAL WHEELS OF DIFFERENT SIZES SELECTIVELY ENGAGEABLE WITH AND DRIVEN BY SAID ENDLESS MEMBER REARWARDLY OF SAID OBLONG WHEEL AND CONNECTED TO SAID REAR WHEEL IN AXIAL ALIGNMENT THEREWITH TO DRIVE IT, SAID ADDITIONAL WHEELS BEING SUBSTANTIALLY SMALLER IN DIAMETER THAN AN OPTIMUM DIMENSION MIDWAY BETWEEN SAID MAJOR AND MINOR DIMENSIONS OF THE OBLONG WHEEL, A MOVABLE WHEEL ASSEMBLY LOCATED ESSENTIALLY BENEATH SAID ADDITIONAL WHEELS AND OPERABLE TO SHIFT SAID ENDLESS MEMBER INTO ENGAGEMENT WITH DIFFERENT ONES OF SAID ADDITIONAL WHEELS, SAID MOVABLE WHEEL ASSEMBLY BEING POSITIONED TO DISPLACE A REAR PORTION OF SAID LOWER RUN DOWNWARDLY LOWER THAN SAID ADDITIONAL WHEELS AND TO THEREBY SPREAD SAID UPPER AND LOWER RUNS OF THE ENDLESS MEMBER RELATIVELY APART REARWARDLY OF SAID OBLONG WHEEL TO A SPACING CLOSER TO SAID OPTIMUM DIMENSION AND YIELDING MEANS URGING SAID MOVABLE WHEEL ASSEMBLY IN A DIRECTION TO TAKE UP SLACK IN THE ENDLESS MEMBER RESULTING FROM SAID SHIFTING THEREOF AND TO ALSO TAKE UP SLACK RESULTING FROM ROTATION OF THE OBLONG DRIVE WHEEL