Threading taps
OwnerRobert J. Cecilinventor
Life of this patent
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Abstract
A threading tap, having the usual longitudinally extending flutes to provide lands therebetween. Each land is provided with screw-cutting teeth, and each land has at least one cross-groove formed therein of a length equal to at least two teeth and of a depth greater than the root depth of adjoining teeth. A cross-groove in one land is longitudinally off-set from a cross-groove in an adjoining land to provide for chip clearance and yet not materially weaken the structure of the tap.
Claims5
A threading tap capable of continuous forward threading movement without intermediate backing-off, said tap having a plurality of longitudinally extending flutes forming a plurality of longitudinally extending lands therebetween, each of said lands having similar full-shaped thread-cutting teeth formed thereon, and each land having at least one cross-groove formed therein of arcuate shape in a direction longitudinally of the land and of a length equal to at least two teeth and of a depth greater than the root depth of adjoining teeth to thereby establish communication between adjoining flutes, each cross-groove in each land being longitudinally off-set from each cross-grove in an adjoining land to provide for chip clearance and yet not materially weaken the structure of said tap.
Dependencies are inferred from the claim text.