Dental router

Claim 1

In a dental chipper which includes a generally pistol-shaped casing, a reciprocably endwise movable vibrating chipping member projecting forwardly from said casing and an electromagnetic driver within said casing effective to actuate said chipping member, the improvement wherein: said casing includes a hollow pistol grip portion having a transversely extending lower wall, a forwardly extending hollow neck portion merging with the upper end portion of said pistol grip portion and means defining a forwardly positioned chamber depending from the forward end of said neck portion, the cavities of said pistol grip portion and said neck portion merging to provide a continuous passageway from said lower wall of said pistol grip portion to said chamber, said chamber being disposed forwardly from said pistol grip portion to define a space therebetween at an elevation above the underside of said chamber for receiving an operator's hand embracing said pistol grip portion, and a top wall of said chamber being interposed between the cavity therein and the cavity within said neck portion, a reciprocably movable armature associated with said driver, a resiliently mounted rear piston disposed in the path of movement in one direction of said armature and spring means mounted on said chipping member continuously urging the rearward end thereof into the path movement of said armature in the opposite direction, said electromagnetic driver being enclosed within said chamber and said chipping member extending forwardly from said driver through an opening in the forward wall of said chamber spatially subjacent to the top wall thereof, and conductor means extending from said driver along said passageway to the outside of said casing at an aperture in the lower wall of said pistol grip portion.