US 4,830,548 AGranted

Method and apparatus for cutting

OwnerRichard Kandarianinventor

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Abstract

A cutting tool assembly including an elongated pilot holder and a cutter blade adapted to be transversely positioned in a transverse slot in the pilot holder. The cutter blade includes cutting edges along one transverse edge of the blade and notches in the upper and lower transverse edges of the blade for respective coaction with a set scrw received in a threaded central axial bore in the lower pilot end of the pilot holder. In use, the lower pilot portion of the pilot holder is positioned in a previously provided pilot hole in a plate member, and the pilot holder is lowered and simultaneously rotated to move the cutting edge of the cutter blade into the upper face of the plate member to perform a cutting operation in the upper face, whereafter the pilot holder and cutter blade are raised, the set screw is loosened to allow removal of the cutter blade from the pilot holder, the pilot holder is lowered to dispose the slot below the lower face of the plate member, the cutter blade is rotated through 180.degree. and reinserted into the slot in the pilot holder, the set screw is threadably advanced to engage the notch in the other transverse edge of the blade holder, and the pilot holder is raised and simultaneously rotated to perform a cutting operation in the lower face of the plate member. A novel peripheral cutter blade is also disclosed, as well as a method whereby the novel peripheral cutter blade may be utilized to form a hole in a plate member.

A cutting tool assembly comprising:

(A) an elongated pilot holder including an upper attachment portion for removable receipt in a chuck, a shank portion below said attachment portion and including a transverse through slot, and a pilot portion below said shank portion and including a central threaded axial bore opening at its upper end in said transverse slot and at its lower end in the lower end of said pilot portion;
(B) a set screw for threaded receipt in said threaded axial bore and defining a head at its upper end for upward projection into said slot;
and
(C) a cutter blade adapted to be positioned in said slot in transverse relation to said pilot holder and including a central attachment portion having a thickness and height generally corresponding respectively to the thickness and length of said slot so as to be slidably received in said slot, a right cutting portion extending to one side of said pilot holder and including a cutting edge at the lower transverse side of said blade, a left cutting portion extending to the other side of said pilot holder and including a cutting edge at the lower transverse side of said blade, a notch in the lower side of said attachment portion sized to receive said head of said set screw with said blade in a first position with its cutting edges downwardly disposed so as to cut downwardly into a piece of material in response to downward movement of said pilot holder with said pilot portion positioned in a previously provided pilot hole in the material, and a matching notch in the upper side of said attachment portion sized to receive said head of said set screw with said blade in a second, reversed position with its cutting edges upwardly disposed so as to cut upwardly into the material in response to upward movement of said pilot holder with said shank portion disposed in the pilot hole to dispose said slot and said blade below the materials, said cutting edge on each of said right and left cutting portions being provided only at the peripheral outer edge of the respective cutting portion with each portion relieved between its outer peripheral edge and the attachment portion so as to provide a circular notch in the face of the material into which the blade is advanced.

1 more element

Abstract

Claims7