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Brush tip for a motorized toothbrush

  • US 6,349,442 B1
  • Filed: 06/23/1999
  • Issued: 02/26/2002
  • Est. Priority Date: 06/23/1999
  • Status: Expired due to Term
First Claim
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1. A brush tip for a motorized toothbrush having a toothbrush motor and a shaft with a conical gear located at a distal end of the shaft, and wherein the toothbrush produces oscillating rotational motion of the shaft and gear, comprising:

  • a first generally cylindrical brush head having a toothed region on the bottom surface;

    a second brush head encircling the first brush head and having a central well with a toothed region on the bottom surface and also having a peripheral wall with a slot therein, the slot extending generally parallel to said bottom surface, the first brush head being located in said well, and the shaft extending into the slot in such a manner that the gear engages with the toothed regions on the first and second brush heads, thereby forming a means for differently accelerating said first and second brush heads in response to motion produced by the toothbrush motor and transmitting said motion to the brush heads in such a manner that the brush heads rotate in opposite senses about a common axis of rotation.

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