Patent ID: 6829801
Filing Date: 2004-12-14
Classification: A61C

Abstract:
An electric toothbrush comprising a brush casing, a toothbrush shaft adapted to rotate in said brush casing, and a bristle carrier disc which is connected to one end of said toothbrush shaft by a gear arrangement that converts one-way rotary motion of the toothbrush shaft into a reciprocating rotary motion of the bristle carrier disc; said bristle carrier disc comprising a pair of bearing surfaces and at least one gap therebetween; said gear arrangement comprising an eccentric mounted at said one end of said toothbrush shaft, said eccentric engaging in said gap in the bristle carrier disc, and wherein the eccentric is formed by at least one cam disc which bridges the gap in every angular position, wherein the two bearing surfaces extend parallel with each other and bear against the eccentric and the eccentric is formed as a non-circular, approximately elliptical cam disc.