Patent ID: 6341925
Filing Date: 2002-01-29
Classification: B23B,Y10S,Y10T

Abstract:
A hole saw comprising;a. a saw cup having a cylindrical cup-shaped body having a front annular cutting surface, a cylindrical shell terminated at a rear annular end thereof by a rear circular base wall having through its thickness dimension a non-circular aperture concentrically aligned with said front annular cutting surface and said shell, b. an arbor holder removably attachable to said saw cup, said arbor holder including a generally cylindrically-shaped body having therethrough a longitudinally disposed, coaxial bore internally threaded for receiving an externally threaded arbor, said arbor holder having a cylindrically ring-shaped outer collar which holds there in an axially disposed inner generally cylindrically-shaped central body having a nose piece which protrudes longitudinally forward from said collar, said nose piece having a transverse cross-sectional shape congruent with said saw cup aperture and being insertable into said saw cup aperture and rotatable to lock said arbor holder and saw cup against relative longitudinal movement, and to limit relative rotational movement of said arbor holder relative to said saw cup, said arbor holder having at least a first locking tab located radially inwardly of a longitudinally disposed cylindrical outer surface of said collar, said locking tab being longitudinally slidably held within a first longitudinally disposed groove formed in said central body and urged forward by first forward biasing spring means to a location rearward of a front transverse face of said nose piece in which location said first tab obstructs a first transversely disposed groove formed in said nose piece, said first tab being translatable rearwardly in said first longitudinally disposed groove by contact of a front portion of said first tab with said rear base wall of said saw cup when said nose piece is inserted into said aperture through said base wall, thus unblocking said first transverse groove and allowing said arbor holder to be rotated in a first sense with respect to said saw cup, said transverse groove rotatably receiving an adjacent portion of a peripheral edge wall of said saw cup bordering said aperture, said arbor holder being rotatable further in a first sense to longitudinally align said tab with a larger diameter portion of said aperture, whereby said first tab is urged forward into said larger diameter portion of said aperture by said first spring means to block said first transverse groove and thereby lock said arbor holder to said saw cup, c. an arbor having a rear shank portion adapted to be clampingly received in a chuck of a power drill, a central longitudinally elongated threaded portion adapted to be threadingly received within said threaded bore through said arbor holder, and a front collet flange portion for clampingly receiving a shank of a pilot drill, and d. A pilot drill held in said collet flange of said arbor holder, said pilot drill being coaxial with and having a tip protruding forward of said front annular surface of said saw cup.