| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a mounting structure of the brush body of an electric tooth brush prevented from falling off and largely turning. SOLUTION: A first engaging protrusion 1 on the holder side directing to the circumferential direction is formed on the outside face 14 of the engaging protrusion on the holder side, an engaging protrusion 30 on the brush side directing in the circumferential direction so as to engage with the first engaging protrusion 16 on the holder side is formed on a first inside face 28 of an engaging dent 26 on the brush side, a plurality of second, engaging protrusions directing in the axial direction are formed at prescribed intervals on a second outside face 20 of the engaging protrusion in the holder side, and a plurality of engaging grooves on the brush side directing in the axial direction so as to engage with the second engaging protrusion on the holder side are formed on the second inside face on the engaging dent on the brush side.</p> |
