| 摘要 |
PCT No. PCT/CA92/00415 Sec. 371 Date Dec. 8, 1994 Sec. 102(e) Date Dec. 8, 1994 PCT Filed Sep. 30, 1992 PCT Pub. No. WO94/00075 PCT Pub. Date Jan. 6, 1994A power-driven dental flossing device has an elongate housing of three casings with an extending housing arm forked at its front, which contains dental floss reels, a dividing gear system, dental floss operating and winding switches, and a powered motor with batteries and/or a transformer. Dental floss across two tines of the forked arm is wound on the two reels, one of which supplies fresh dental floss, the other takes up used floss. The dental floss can be automatically reciprocated between the tines and teeth by pulling an operating switch backward, and also can be manipulated manually by pushing the same operating switch forward. The floss can also be automatically wound in one direction at time to provide a fresh length of the floss, or to rewind it back at any time. The floss reels are driven by the gear system which comprises pinions installed on reel shafts, and a main dividing gear with partially geared circumference to drive each one of pinions alternately, therefore the dental floss can automatically complete reciprocating motion to accomplish teeth cleaning. The main gear can also be slid to an upper or lower position on its shaft where only one pinion could be driven by the main gear, therefore the dental floss will be continually wound only in one direction at a time.
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