| 摘要 |
<p>The wear indicator (10) is for a workpiece portion of a personal care appliance such as a power toothbrush (IS) . The wear indicator includes a member of water-soluble material which has magnetic particles positioned therein. Upon repeated contacts with water, which correlates with use of the device, the member dissolves or swells, depending on the material selected. A magnet positioned adjacent the member influences the position of the magnetic particles in the member, aligning them into a three-dimensional image which is recognizable by the user, wherein the appearance of the image correlates with sufficient wear on the workpiece that it should be replaced.</p> |
