Patent ID: 8701235

Claim:
An electric tooth brush comprising: a handle portion including an electric motor; a first drive shaft; a second drive shaft; and a drive comprising a first drive section and a second drive section; wherein the first drive section is arranged to convert a rotational motion of the electric motor into an oscillating pivoting of the first drive shaft and the second drive shaft; a head portion including a housing being attached to the second drive shaft of the handle portion in order to enable a transfer of an oscillating pivoting of the second drive shaft to an oscillating pivoting of the housing, wherein the oscillating pivoting of the housing occurs around an axis of rotation having a first direction; a head portion axle being attached to the first drive shaft of the handle portion in order to enable a transfer of an oscillating pivoting of the first drive shaft to the head portion axle; a bristle carrier having a plurality of bristles, which is rotatably supported by the housing, wherein the axis of rotation of the bristle carrier has a second direction being different from the first direction; and a head portion drive coupling the head portion axle to the bristle carrier in order in order to enable a transfer of an oscillating pivoting of the head portion axle to the bristle carrier, wherein the head portion drive is a con-rod drive; wherein the first direction of the axis of rotation of the housing is perpendicular to the second direction of the axis of rotation of the bristle carrier; wherein the second drive section includes a first gear wheel mounted to one of the first drive shaft and the second drive shaft; the first gear wheel engaging a second gear wheel pivotably supported by a housing of the handle portion; wherein the second gear wheel eccentrically carries a pin, and wherein the pin engages a lever mounted to one of the second drive shaft and the first drive shaft; and wherein the pin when considered in a side view is arranged between an axis of rotation of the second gear wheel and an axis of rotation of one of the first drive shaft and the second drive shaft in order to transfer a pivoting of one of the drive shafts to a pivoting of the other drive shaft in the same rotational direction.