Patent ID: 6721986
Filing Date: 2004-04-20
Classification: A61C,Y10T

Abstract:
An electric toothbrush, comprising:a housing; an electric motor connected to said housing, said electric motor having a motor output member for rotation about a motor output axis; a first transmission linked to said motor output member, said first transmission to convert rotational movement from said motor output member into rotational reciprocating movement at a first average angular speed; and a second transmission linked to said first transmission, said second transmission to convert rotational reciprocating movement from said first transmission into rotational reciprocating movement at a second average angular speed about a second transmission output axis that is parallel to said motor output axis and to drive an output member to reciprocate at said second average angular speed about said second transmission output axis, and said second transmission having a first gear member, said first ear member comprising a section of an internal gear connected to said first transmission, and a second gear member drivenly connected to said first gear member.