Method and apparatus for brushing teeth with cyclically rotating brush strokes
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United States of America Patent
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Jun 9, 1992
Grant Date -
N/A
app pub date -
May 1, 1991
filing date -
May 1, 1991
priority date (Note) -
In Force
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Abstract
A toothbrush includes a cluster of rotatable bristle tufts disposed between two longitudinally spaced clusters of positionally fixed bristle tufts. The fixed bristles frictionally engage tooth surfaces to oppose longitudinal movement of the brush head in response to longitudinal reciprocation of the brush handle within the head. A rack and pinion convert the longitudinal reciprocation of the handle to oscillatory rotation of the rotatable bristle tufts.
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Family
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