Patent ID: 6859968

Claim:
A power toothbrush, comprising: a toothbrush housing; a drive assembly comprising: a motor having an armature which in operation rotates back and forth through an arc of predetermined magnitude about the longitudinal axis of the armature; an output assembly which includes a brushhead; a coupling assembly having a node point, the coupling assembly connecting the armature to the output assembly, wherein the coupling assembly is so arranged relative to the armature and the output assembly and operates in response to a drive signal having such a frequency that the brushhead rotates about the longitudinal axis of the armature 180° out of phase from the rotation of the armature, such that the drive assembly is substantially isolated vibrationally from the housing; and at least one support element connected between the drive assembly and the housing, wherein the node point of the coupling assembly remains substantially stationary without rotating during operation of the toothbrush.