Threading taps

Details Threading taps Threading taps

1974-06-21

1976-03-23

Lanham, C. W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408219, 408222, B23G 506

Patent

active

039450694

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.

REFERENCES:
patent: 224921 (1880-02-01), Kenworthy
patent: 425372 (1890-04-01), Dillon
patent: 832076 (1906-10-01), Oster
patent: 1111413 (1914-09-01), Smith
patent: 1293432 (1919-02-01), Higgins
patent: 1345425 (1920-07-01), Wells
patent: 1365338 (1921-01-01), Muth
patent: 2029514 (1936-02-01), Thomson
patent: 2330099 (1943-09-01), Whyland
patent: 2787010 (1957-04-01), Uphoff
patent: 3661471 (1972-05-01), Simonffy

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