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Electric toothbrushes

  • US 4,989,287 A
  • Filed: 08/18/1989
  • Issued: 02/05/1991
  • Est. Priority Date: 09/09/1988
  • Status: Expired due to Term
First Claim
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1. An electric toothbrush comprising:

  • a handle;

    a brush member connected to the handle and including a brush head having a plurality of cylindrical and axially rotatable bristle holders, wherein each bristle holder comprises a cam eccentrically extending from a bottom portion of the bristle holder;

    a connecting rod extending along the brush member for oscillating said bristle holders, said connecting rod having a plurality of substantially transverse grooves engaged with the cams of the bristle holders; and

    driving means located within the handle and connected to the connecting rod for moving the connecting rod in a reciprocating manner along a longitudinal direction of the brush member,wherein the brush member is connected to the handle such that the brush member is rotatable about its longitudinal axis, and the connecting rod is fixed within the brush member such that the connecting rod is not axially rotatable independent of the brush member, said driving means producing an oscillatory rotation of the connecting rod about its longitudinal axis, in addition to moving the connecting rod in a reciprocating manner along the longitudinal direction of the brush member.

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