Electric toothbrush
First Claim
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1. An electric toothbrush comprising:
- a housing incorporating an electric motor having a drive shaft that rotates about a longitudinal axis of the housing;
a shank extending beyond one end of the housing generally in line with the longitudinal axis that supports a brush head at its remote end, the shank being pivotably supported intermediate its length adjacent the one end of the housing; and
a mechanical coupling between the drive shaft and a near end of the shank arranged to cause both the near end and the brush head to move through a circular path as the drive shaft rotates, the mechanical coupling further comprising an eccentric cam mounted to the drive shaft and a cup that fits over and engages sides of the cam on the drive shaft, the cup mounted on the near end of the shank, the eccentric cam having a peripheral continuous channel that extends axially with respect to the longitudinal axis and the cup has a finger that engages in the channel so that when the drive shaft rotates the cup is urged backwards and forwards along the longitudinal axis.
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Abstract
An electric toothbrush has a housing incorporating a motor with a drive shaft rotatable about a longitudinal axis A. A shank extends beyond the housing and is integrally formed with a brush head at its remote end. The shank is pivotably supported intermediate its length in an end wall of the housing. An eccentric cam mounted to the shaft cooperates with a cup on a near end of the shank to form a mechanical coupling. When the shaft rotates both the near end and the brush head moves through a circular path.
87 Citations
4 Claims
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1. An electric toothbrush comprising:
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a housing incorporating an electric motor having a drive shaft that rotates about a longitudinal axis of the housing;
a shank extending beyond one end of the housing generally in line with the longitudinal axis that supports a brush head at its remote end, the shank being pivotably supported intermediate its length adjacent the one end of the housing; and
a mechanical coupling between the drive shaft and a near end of the shank arranged to cause both the near end and the brush head to move through a circular path as the drive shaft rotates, the mechanical coupling further comprising an eccentric cam mounted to the drive shaft and a cup that fits over and engages sides of the cam on the drive shaft, the cup mounted on the near end of the shank, the eccentric cam having a peripheral continuous channel that extends axially with respect to the longitudinal axis and the cup has a finger that engages in the channel so that when the drive shaft rotates the cup is urged backwards and forwards along the longitudinal axis. - View Dependent Claims (2, 3, 4)
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Specification