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US 4,163,300 AGranted
Electric toothbrush
OwnerHugh D. Quintinventor
Life of this patent
Estimating the term…
Abstract
An electric toothbrush consisting of an elongated body member having a cylindrical brush mounted coaxially therewith at one end thereof, and driven rotatably by a reversible electric motor carried in the handle, and having an automatic reversing switch responsive to the position in which the handle is held to cause rotation of the brush such that its bristles move in a direction from the gum line toward the crowns of the teeth.
Claims5
An electric toothbrush comprising:
- a. an elongated body member adapted to serve as a handle whereby the device is manually held and manipulated,
- b. a generally cylindrical brush carried by said body member at one end thereof, said brush being disposed generally coaxially with said body member and being mounted thereon for rotation about its axis,
- c. a reversible electric motor mounted in said body member and operable to rotate said brush selectively in opposite directions, and
- d. reversing switch means carried by said body member and operable to reverse the direction of rotation of said motor, said reversing switch means being operable responsively to gravity-induced movement of an element thereof to cause respectively opposite directions of said motor depending on whether said body member is held in a position with its axis inclined upwardly toward said brush, or downwardly toward said brush.
1 more element
Dependencies are inferred from the claim text.