Patent ID: 6857830

Claim:
A roof core cutter comprising: (a) a saw body having a base end having through its thickness dimensioned a non-circular axial aperture, a side wall extending from the base end defining an interior cavity, an outer edge and a plurality of cutting teeth formed on the outer edge; (b) a core ejecting mandrel having a proximal end adapted to be rotatably coupled to a rotary drive means, an elongated shaft, a right-hand threaded non-circular shoulder portion and a distal outwardly extending core-ejecting flange; (c) a mandrel nut having internal right-hand threads; and (d) means for guiding the roof core cutter in the controlled cutting of work material when the roof core cutter is rotatably coupled to a rotary drive means; wherein the proximal end of the core-ejecting mandrel is slidably received by the saw body such that the non-circular threaded shoulder extends through the non-circular aperture in the base of the saw body and is threadedly received by the mandrel nut, securing the core-ejecting flange against the base of the saw body; whereby the mandrel nut, core-ejecting mandrel, and saw body cooperate to couple rotational power from the mandrel to the saw body when a rotary drive means, secured to the proximate end of the mandrel, operates to advance the saw body through a workpiece.