| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a rotary base from being broken and retain usability of a toothbrush by forming the toothbrush so that the outer periphery of the rotary base of the rotary brush brushing teeth while rotating is positioned at almost the same height with the top of an attachment holder. SOLUTION: In this motor-driven toothbrush, a rotary brush 7 is turned by a specified angle by driving a motor 2 to brush teeth by the revolution of the motor. There is a fear that the motor-driven toothbrush drops during use by mistake but since there is almost no level difference between the outer periphery of the rotary base 8 and the top 11 of an attachment holder 6, the top 11 of the attachment holder is hit together with the rotary base 8 and hence, the rotary base 8 can be prevented from being broken. Further, since the diameter of a round part 13 is made smaller than the diameter of the rotary brush 7, even if the top 11 is flush with the outer periphery of the rotary base 8, the usability in the mouth is favorable.</p> |
