| 摘要 |
PURPOSE: An electric toothbrush is disclosed having a power driven rotary brush in which the direction of rotation of the brush is automatically controlled depending on whether the top or the bottom teeth are being brushed in order to brush any food debris present on the teeth and gums in a direction away from the gums. The toothbrush of the present invention utilizes a direction controller that is placed inside the mouth between the top and bottom teeth. CONSTITUTION: The electric toothbrush comprises:a housing; a bi-directional electric motor(20) provided in the housing and having a motor axis(18); an electric energy source(22) included in the housing; a multi-position electric reverse switch(24) electrically associated between the motor(20) and the electric energy source(22); a rotary brush rotationaly attached at the centrifugal end of the housing and mechanically associated with the motor axis(18); and a direction controller(50) associated with the reverse switch(24). The direction controller(50) controls the direction of brush rotation and serves to stabilize the toothbrush relative to the teeth during the brushing operation. The movement of the direction controller(50) operates a reversing switch(24) to change the direction of rotation of the brush as required to brush in a direction away from the gums and towards the teeth without removing the toothbrush from the mouth.
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