| 摘要 |
<p>A battery-powered toothbrush has two bristle units in a toothbrush head which reciprocate the base and the tip of the teeth for brushing in a simple structure with a slim form and a detachable head bar. An elongated handle includes a rotation driving unit. A head bar has a bristle driving shaft rotated upon receipt of a rotational force from the rotation driving unit. The bristle driving shaft includes an eccentricity unit spaced apart from a first rotation axis line (Y). The bristle unit has a bristle support body onto which bristles are implanted, and the support body is rotatably and reciprocally moved centering around a second rotation axis line almost perpendicular to the lengthy direction of the teeth. A link is formed between the eccentricity unit and the bristle support body for shifting and transmitting the rotational movement of the eccentricity unit to a rotational and reciprocating movement of the bristle unit.</p> |
