Screw thread cutting member

Details Screw thread cutting member Screw thread cutting member

1977-12-06

1979-10-16

Combs, E. M.

Cutting by use of rotating axially moving tool

Tool or tool with support

With pitch-stabilizing ridge

10141R, 408219, 408220, 408222, B23G 506

Patent

active

041711777

ABSTRACT:
A male screw thread-formed member such as an insert having a thread cutting action has an exterior peripheral portion of substantially full V-thread form along which two or more angularly spaced apart flutes extend from one or both ends of the member, the member being provided with at least one non-helical rib initially of generally annular peripheral V-form at one or both ends thereof and on which is formed a varying reduced V-thread form which follows a helix corresponding to that of the full thread form whereby pointed cutting formations providing peaks of different radial heights and with some of them of offset disposition relative to the helix are formed on the or each rib at the flutes for effecting a distributed thread cutting action thereat, e.g., for use in thermo-setting plastic material.

REFERENCES:
patent: 224921 (1880-02-01), Kenworthy
patent: 252868 (1882-01-01), Denison
patent: 2093172 (1937-09-01), Olson
patent: 2156350 (1939-05-01), Olson
patent: 2204866 (1940-06-01), Parish
patent: 2816302 (1957-12-01), Bauer
patent: 2828493 (1958-04-01), Koehler

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