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Electric toothbrush

  • US 4,974,278 A
  • Filed: 02/06/1989
  • Issued: 12/04/1990
  • Est. Priority Date: 02/06/1988
  • Status: Expired due to Term
First Claim
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1. Electric toothbrush comprising:

  • a tooth brush casing;

    a brush rod mounted in the toothbrush casing so as to be rotatably and longitudinally movable;

    a lever fixed to said brush rod, wherein said lever has a socket portion which is provided with a socket having a center axis perpendicular to the longitudinal axis of the brush rod;

    an eccentric cam which communicates with said socket, wherein said eccentric cam has a rotational axis which is perpendicular to the longitudinal axis of the brush rod; and

    means for rotating said eccentric cam to cause an oscillatory movement of the lever and the brush rod about the longitudinal axis of the brush rod and a longitudinal movement of the lever and the brush rod along the longitudinal axis of the brush rod.

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