| 摘要 |
<p>The present invention provides a locking mechanism position,ed in a toothbru sh handle having interchangeable heads, comprising a shaft that extends the length of the handle, with an elliptical tip at one end and receiving means at the opposite end. A key may be interconnected to the receiving means to permit the elliptical tip to rotate . In a first position, the elliptical tip permits the removal and replacement of an interchangeable head, because the longer dimensions of the elliptical tip and an ellipticall y cross-sectioned opening in the interchangeable head coincide. In a second, rotated position, the elliptical tip locks within the interchangeable head, as the longer dimensio ns no longer coincide.</p> |
