PROBLEM TO BE SOLVED: To prevent trouble by the invasion of water inward from a switch part in an interdental brush, and also to perform changeover among weak, middle and strong even during using the electric interdental brush.SOLUTION: An electric interdental brush is constituted by including in a cylindrical holder 1, a battery 9, a motor 10 to be rotated with the battery 9 as a power source, and a vibration axis 6 whose distal end is finely vibrated in a perpendicular direction when receiving the rotating movement of the motor 10. Besides, a brush 4 is removably attached to the distal end of the vibration axis 6. The electric interdental brush also includes a rotary switch mechanism which is arranged on the bottom of the holder 1 to change over the power source of the motor 10 among weak, middle and strong. The electric interdental brush is used by switching the rotary switch mechanism by a tab 22, and also waterproofness is obtained by assembling an O-ring 24 with an interlock axis 23.COPYRIGHT: (C)2012,JPO&INPIT【技術課題】歯間ブラシにおいてスイッチ部分から内部に水が浸入してトラブルになるのを防ぐと共に使用時に弱、中、強の切り換えを可能にする。【解決手段】筒状ホルダー1内に電池9とこの電池9を電源として回転するモータ10と、前記モータ10の回転運動を受けて先端側が直角方向に微振動する振動軸6を設けると共にこの振動軸6の先端に着脱自在にブラシ4を取り付けた構成の電動歯間ブラシにおいて、前記ホルダー1の底部には前記モータ10の電源を弱、中、強に切り換えるためのロータリー式のスイッチ機構を設ける。そして、このロータリー式スイッチ機構をツマミ22で切り換えて使用できるようにすると共に連動軸23のところにOリング24を組み付けて防水を図る。【選択図】図3
