Importance

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Abstract

A drill bit sharpener in combination with a hand held electric power drill having a chuck, an electric motor and a drive shaft powering the chuck. The sharpener includes an abrasive wheel supported within the hand held housing of the electric power drill for rotation about a central axis. The abrasive wheel has a cupped concave angled grinding face disposed facing the hand held housing. The housing has a single passageway parallel to and off set from the central axis. An aperture is disposed within the housing normal to and communicating with the single passageway. A first stationary pin is engaged within the aperture extending outwardly into the single passageway for engaging a first flute on a drill bit inserted through the single passageway. A second reciprocal pin extends outwardly into the single passageway, opposing the first pin, for engaging a second flute of the drill bit to secure the drill bit against rotation. A rotatable plate is disposed on an external surface of the housing and has a plurality of apertures individually alignable over the single passageway for selectively locating a desired size aperture in communication with the single passageway allowing insertion of a correspondingly sized drill bit for sharpening. Each aperture on the rotatable plate is disposed at a radial distance from the rotational axis of the shaft which in combination with the first and second pins defines an angular orientation of the drill bit with respect to the angled grinding face of the abrasive wheel.

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First Claim