This application includes a number of embodiments of a spring powered
toothbrush for cleaning teeth. A wind-up spring is located in the base of
the toothbrush which spring provides power for a gear train including a
drive shaft assembly that is designed to bring about rapid movement of
the brush portion of the toothbrush to aid in cleaning the teeth. The
drive mechanism is controlled by a spring biased push button in the
toothbrush housing. In one version the brush portion of the toothbrush
includes a rotatable brush section that is gear driven by the drive
shaft. In another version the upper portion of the toothbrush is vibrated
by an offset weight connected to the drive shaft and in a third version
the drive shaft includes an offset weight that acts to oscillate a
movable brush section by intermittent engagement between the; weight and
brush section.