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Mechanically-driven, sonic toothbrush system

  • US 8,943,634 B2
  • Filed: 05/02/2012
  • Issued: 02/03/2015
  • Est. Priority Date: 05/02/2011
  • Status: Active Grant
First Claim
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1. A toothbrush comprisingan electric motor including a drive shaft, wherein, when the electric motor is caused to operate, the drive shaft continuously rotates until the motor is caused to stop;

  • a brush shaft; and

    a drive assembly consisting of a bar linkage coupled between the drive shaft and the brush shaft, the bar linkage comprisinga coupler having a first end operably coupled to the brush shaft and a second end;

    an eccentric pin rotationally received within the second end of the coupler, the eccentric pin having a rearward end shaft axially aligned with an axis of the drive shaft and a mid-portion axially offset from the axis of the drive shaft, whereinthe rotation of the drive shaft causes the eccentric pin to rotate within the second end; and

    the rotation of the eccentric pin causes the coupler to oscillate to convert the rotation of the drive shaft into oscillation of a toothbrush head supported on an end of the brush shaft.

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