| 摘要 |
<p>PURPOSE:To obtain a motor-driven tooth brush with a thin grip of a body case and a simple structure. CONSTITUTION:This tooth brush is provided with a face gear 34 having a fitting protrusion 37, supported to be freely rotatable at the fixed supporting point shaft 32 and rotated by a reversible motor, a cam base 39 molded together with the face gear as a unit and a cylindrical eccentric cam 40. Further, it is provided with an eccentric cam body 38 having a pierced hole in which the supporting point shaft is passed therethrough and a cam-driven part fitted to the eccentric cam and jointed to the driving shaft. The cam base has the center at the eccentric position from the supporting point shaft and the first fitting part 42 to which the fitting protrusion is fitted on the normal revolution of motor, the first cam face 43 connected to the first fitting part, the second fitting part 44 to which the fitting protrusion is fitted on revesal revolution of motor, and the second cam face 45 connected to the second fitting part, at the positions of the respective same distance from the center.</p> |
