| 摘要 |
<p>PURPOSE:To remarkably improve bearing efficiency and to obtain a high rate for eliminating deposit by supporting the tip side of a driving shaft to which a toothbrush is connected with a rolling bearing, and the rear end side of which connected to a driving means with a slide bearing. CONSTITUTION:Since the driving shaft 3 performs reciprocal movement in an axial direction, the mounting of the driving shaft 3 on holders 13, 14 are performed via bearings. At such a case, the driving shaft 31 is supported with the rolling bearing 31 and the slide bearing 3 loaded on the holders 13, 14. The rolling bearing 31 supporting the tip side of the driving shaft 3 to which a toothbrush body 2 is connected is formed so that a ball 33 can be moved in the axial direction when the driving shaft 3 performs the reciprocal movement in the axial direction. The slide bearing 38 supporting the rear end part of the driving shaft 3 performs the whirl-stop of the driving shaft 3 other than the guidance of the movement of the driving shaft 3 in the axial direction.</p> |
