| 摘要 |
A power-driven fully automatic dental flossing device has an elongate housing configuration with an extending thin housing arm forked at the front end, and an enlarged housing handle for containing a pair of reels (11, 17) with dental floss (10) on them, a dividing gear system, dental floss operating and winding switches (7), and a powered motor (40) with batteries and/or a transformer. The dental floss (10) across two tines of the forked arm is wound on the two reels, one of which supplies fresh dental floss, the other stores the floss as it is no longer usable. The dental floss (10) can be automatically reciprocated between the tines and teeth by pulling an operating switch (7) backward with a single user's finger, and also can be manipulated manually whenever it is necessary by pushing the same operating switch forward. On the other hand, the dental floss can be continuously and automatically wound backward or forward with one button touch (5) to provide a fresh section of floss, or rewinding it back at any time, even when the dental floss is still between teeth. The pair of reels (11, 17) winding the dental floss are driven by the dividing gear system which comprises two pinions (27, 28) installed on two reel shafts (25, 26), separately, and a main dividing gear (23) with only partial circle gear teeth (as an exemplary arrangement shown in the attached drawing, 180 circumference of the main gear has gear teeth). When rotating a full cycle, the main gear has to drive each one of pinions a half of said cycle, respectively, therefore both reels, rotating together with the two pinions, will in turn be a primary driving reel to wind the dental floss onto itself and a following reel to release the dental floss off itself, so that the dental floss can automatically complete reciprocating motion to achieve the object of cleaning teeth. The main gear (23) can also be slid by a yoke of the winding switch (5) to an upper or lower position where only one pinion could be driven by the main gear, therefore the dental floss (10) will be continuously wound only in one direction at a time, and the above-mentioned function of providing or rewinding dental floss can be automatically accomplished. |
