Patent ID: 7810200
Filing Date: 2010-10-12
Classification: A61C,Y10T

Abstract:
1. An electric toothbrush comprising a motor housed in a case, motion conversion means for converting the rotation of a motor shaft of the motor into reciprocating motion approximately along an axis of the motor shaft, and a brush member movable with the reciprocating motion, the motor shaft being provided with an eccentric rotating body rotatable with the rotation of the motor shaft, the motion conversion means having a pivotal body supported by a rod and pivotally movable in a plane orthogonal to the motor shaft, the pivotal body having a rectangular frame for the eccentric rotating body to slidably rotatably fit in and being pivotally movable by the rotation of the eccentric rotating body, the motion conversion means further having a reciprocating shaft provided with the brush member and connected to another portion of the pivotal body to reciprocatingly move with the pivotal movement of the pivotal body and to cause the brush member to perform reciprocating motion, wherein the pivotal body is pivotally movably supported by the support rod, and the reciprocating shaft is connected by a connecting member to a pivot positioned in the vicinity of the support rod and away from the axis of the case toward a direction orthogonal to the axis of the case.