Patent ID: 7757327

Claim:
An electric toothbrush comprising: housing means for giving said toothbrush form, said housing means comprising an elongate, substantially hollow handle portion and having at an upper end thereof a substantially hollow shoulder portion, said housing means supporting the following working elements of said toothbrush: brushing means for brushing a user's teeth said brushing means comprising: a brush drive shaft, a brush head, a brush head connector having two ends, said brush head connector being securely attached to said brush head at one end and to said brush drive shaft at the other end, in such way preventing said brush drive shaft and said brush head from rotating around their own axes, and a brush chamber having an oval aperture with inner walls, said brush head connector passing therethrough and said brush head connector being capable of sliding against the inner walls of said aperture, spacing means for spacing said brushing means away from the surface of a user's teeth, sealing means for preventing liquid from entering inside said toothbrush, power means for providing power to said toothbrush, motor means for converting said power into rotary motion of a drive shaft of said motor means, switch means for turning said motor means on and off and controlling the direction of rotation of the drive shaft of said motor means as determined by the teeth to be brushed, from among the group consisting of the upper teeth and the lower teeth, and conversion means for converting the rotary motion of said motor means drive shaft to an elliptical motion of said brushing means, wherein said conversion means comprises an elliptical drive mechanism, said elliptical drive mechanism comprising: said oval aperture on said brush chamber, a pivot assembly, a rotary plate receiving an end of said motor drive shaft, such that rotary motion of said motor drive shaft results in rotary motion of said rotary plate, said rotary plate having a groove through which an end of said brush drive shaft passes, said end of said brush drive shaft being able to slide inside said groove along a longitudinal axis of said groove and an oval plate having an outer edge and a center, a base of said motor drive shaft passing through said center of said oval plate, wherein an end of said brush drive shaft slides against said outer edge of said oval plate during said elliptical motion of said brushing means.