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A power assist apparatus, which includes a battery powered motor mounted on a manually operated vehicle, such as a bicycle, and is to be selectively usable by the rider of the bicycle to not only assist in the manual operation of the bicycle, but also conceivably as a sole source of operation of the

A power assist apparatus, which includes a battery powered motor mounted on a manually operated vehicle, such as a bicycle, and is to be selectively usable by the rider of the bicycle to not only assist in the manual operation of the bicycle, but also conceivably as a sole source of operation of the bicycle. The power assist apparatus is fixedly mounted on the bicycle and is carried with the bicycle at all times. The power assist apparatus includes a motor assembly which is operated through a gear connection to drive a driven gear mounted in conjunction with a wheel of the bicycle. The rotational axis of the shaft of the motor is parallel to the rotational axis of the wheel.

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[ What is claimed is:] [1.] In combination with a bicycle, said bicycle having a frame mounted on at least one support wheel, said support wheel being rotatable within a plane of rotation, said support wheel having an axle with said axle being mounted on said frame, said axle having an axis of rotat

[ What is claimed is:] [1.] In combination with a bicycle, said bicycle having a frame mounted on at least one support wheel, said support wheel being rotatable within a plane of rotation, said support wheel having an axle with said axle being mounted on said frame, said axle having an axis of rotation which is perpendicular to said plane of rotation, the improvement comprising:a disk mounted on said support wheel, said disk having a periphery, a one-way clutch mechanism mounted on said periphery, a driven gear mounted on said one-way clutch mechanism, said driven gear defining a rotational plane, said rotational plane being parallel to said plane of rotation, said disk having a center point, said center point coinciding with said axis of rotation; anda motor assembly having an output shaft, said motor assembly being mounted on said frame, said output shaft having a rotational axis, a drive gear mounted on said output shaft, said drive gear being in engagement with said driven gear, said rotational axis being parallel and spaced from said axis of rotation, said motor being electrically operated to rotate said drive gear and hence said driven gear which provides a power assist to rotate said support wheel.