Patent ID: 9022703
Filing Date: 2015-05-05
Classification: B23B,Y10T

Abstract:
1. A hole-saw assembly including: a hole-saw having at one end a plurality of cutting teeth and two symmetrically opposing driving apertures, said hole-saw including a center thread; a boss including a threaded shaft adapted to engage the hole-saw center thread, said boss including two locking shafts; a mandrel coaxially aligned with said hole-saw and including a body having two bores therethrough coaxially aligned with said locking shafts; an annulus coaxially aligned with said mandrel and hole saw and including two holes, said annulus rotatable around its longitudinal axis from a first to a second position, wherein in said first position said annulus holes are aligned with said bores and said shafts allowing said shafts to be freely insertable and removable and in said second position said holes being misaligned thereby locking said shafts to said annulus; at least one driving pin integrally attached to said mandrel and adapted to engage said driving apertures; and wherein the boss includes two notches so located and dimensioned to accommodate the at least one driving pin to extend alongside the boss.