Abstract: An electric toothbrush includes a handle, a bristle head and a neck extending from the handle to the bristle head. A drive shaft extends through the neck to the bristle head. A motor is situated within the handle and has a pair of spaced recesses and an output shaft situated between the recesses. A reduction gearbox receives torque from the output shaft of the motor and transmits it to the drive shaft at a reduced speed. The gearbox has a base plate having a pair of projections extending into the recesses of the motor, a cover plate fixed to the base plate and at least one gear set between the base plate and the cover plate to transmitting torque from the motor to the drive shaft.

Abstract: Typical electric toothbrush brushes pivotally, which is quite different from the non-electronic counterpart. The electric toothbrush (10) of this invention includes an axial brush section (40) movable in an axial direction substantially perpendicular to the toothbrush handle (14), which defines a longitudinal direction. The electric toothbrush (10) of this invention may brush teeth in a way resembling that of using traditional non-electric toothbrush, as the axial brush section is moving along the direction of tooth growth.

Abstract: An electric toothbrush includes a handle, a bristle head and a neck extending from the handle to the bristle head. A drive shaft extends through the neck to the bristle head. A motor is situated within the handle and has a pair of spaced recesses and an output shaft situated between the recesses. A reduction gearbox receives torque from the output shaft of the motor and transmits it to the drive shaft at a reduced speed. The gearbox has a base plate having a pair of projections extending into the recesses of the motor, a cover plate fixed to the base plate and at least one gear set between the base plate and the cover plate to transmitting torque from the motor to the drive shaft.