Patent ID: 8966698
Filing Date: 2015-03-03
Classification: A61C

Abstract:
1. A brush head for an electric toothbrush, the brush head including: a housing; a plurality of bristle tufts extending through an aperture in the housing; a gear train within the housing, the gear train including a drive gear configured to oscillate about an axis, and a plurality of first driven gears, each first driven gear meshed directly with the drive gear, each first driven gear being smaller than the drive gear; drive means configured to provide motion to the gear train; the drive gear providing a first drive output including a first oscillating motion in a first direction; and the driven gears each providing a second drive output including a second oscillating motion in a second direction which is opposite to the first direction; wherein the plurality of bristle tufts includes a first set of bristle tufts attached to the drive gear and a second set of bristle tufts attached to the plurality of first driven gears, each second set of bristle tufts having a tapered tip and extending axially from the plurality of first driven gears.