Patent ID: 8875335

Claim:
A power toothbrush, comprising: a driving assembly, including a battery and a DC motor ( 14 ), the DC motor having a rotating drive shaft ( 16 ) extending therefrom, the drive shaft having a free end rotationally mounted in first and second spaced apart fixed support members ( 22 , 24 ) wherein at least the first fixed support member is secured to a handle portion of the toothbrush, the drive shaft including an eccentric portion ( 18 ) located proximately from a proximal end thereof, extending outwardly from the drive shaft from between the first and second fixed support members, wherein the eccentric portion rotates with the drive shaft; a spring assembly extending outwardly from the eccentric portion, the spring assembly including a spring member ( 38 ) which alternates between two conditions as the drive shaft rotates about an axis and the eccentric portion moves about said axis; a brushhead shaft member ( 32 ), positioned laterally away from the driveshaft, extending between the fixed support members ( 22 , 24 ) and rotatable therein, wherein the brushhead shaft member has a yoke member ( 36 ) secured thereto and extending away therefrom, wherein the spring member extends between the eccentric portion and the yoke member, wherein in operation, an oscillating action of the brushhead shaft is produced as the drive shaft rotates, with the spring member alternating between its two conditions; and a brushhead assembly ( 40 ) with bristles ( 42 ) mounted on the brushhead shaft for cleaning a user's teeth.