Irwin-industrial Tool Company

Gary F Scott

William B Korb

David J Trettin

Brian K Douglas

Dayananda Sukadhare

A composite utility blade and method of making such a blade involves butt joining a high speed or tool steel wire to a front edge of an alloy steel backing strip. The wire defines a predetermined cross-sectional shape that substantially corresponds to the cross-sectional shape of the cutting edge of the blade. The wire is electron beam welded to the backing strip to form a composite strip defining a first metal portion formed by the alloy steel backing strip, a second metal portion formed by the high speed or tool steel wire, and a weld region joining the first and second metal portions. The composite strip is then annealed, and the annealed strip is straightened to eliminate any camber therein. The annealed composite strip is then hardened such that the first metal portion defines a first surface hardness and the second metal portion defines a second surface hardness greater than the first surface hardness. The hardened strip is then subjected to tempering and quenching cycles, and facets are formed on the edge of the second metal portion to form a straight, tool steel cutting edge. The composite strip is then scored at axially spaced locations to form a plurality of score lines, and the plurality of score lines define a plurality of blade sections there between. The cutting edge may be coated with AlTiN, TiN, or an inner coating of AlTiN and an outer coating of TiN.

Composite utility blade, and method of making such a blade

A wood boring bit for boring holes in wood and other similar work surfaces having a central longitudinal axis, a main body, a pilot screw tip and a partial flute with a cutting edge and a cutting spur. The flute portion may be defined by a partial helical section having a distal end joined to the main body and a lead edge disposed toward said screw tip. The distal end and the lead edge preferably do not overlap along the central axis and are equal to or less than 360&#xb0; from one another around the axis. The partial flute provides improved waste removal and allows the user to access the cutting edge of the flute for maintenance purposes.

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Huntersville, NC, United States of America

Gary F Scott