Motorized toothbrush brush tip with two counter-rotating brush heads rotating on a common axis
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United States of America Patent
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Jun 22, 2004
Grant Date -
Oct 31, 2002
app pub date -
Feb 25, 2002
filing date -
Jun 23, 1999
priority date (Note) -
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Abstract
A brush tip for a motorized toothbrush has a first brush head and a second brush head. The second brush head encircles the first brush head. A shaft has two cranks, each engaging one of the brush heads. Continuous same-direction rotation of the shaft causes the brush heads to counter-rotate about a common axis. Distal ends of the first set of bristles on the first brush head form a circular pattern and the distal ends of the second set of bristles on the second brush head form an elliptical pattern.
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