Insert of the self-tapping fluted type

Details Insert of the self-tapping fluted type Insert of the self-tapping fluted type

1975-07-08

1977-01-18

Frazier, Roy D.

Brushing, scrubbing, and general cleaning

151 4173, F16B 2500

Patent

active

040032876

ABSTRACT:
A metallic fastener or insert of the type adapted to thread itself into a recess formed in a plastic work piece has a multiplicity of uniformly angularly spaced, longitudinally extending flutes, each of which is formed with a flat bottom surface and with flat side walls angularly related to define between them an included angle of about 60.degree. . The flutes are each formed to a depth greater than the root diameter of the external threads of the insert, that is, the flat bottom surface of each flute lies in a plane tangential to an imaginary circle of a diameter smaller than the root diameter of the external thread of the insert.
In accordance with the invention, the opposite end portions of the insert are tapered frustro-conically. The external diameter of the insert at each of its tapered ends is smaller than the diameter of the mentioned imaginary circle, such that the opposite ends of each flute merge into the tapered end portions of the insert short of the extremities of the insert and there disappear.
When threaded into a recess having a diameter equal to or smaller than the diameter of the insert at the end of the flute, the insert will set up a cutting action, adapted to cause chips to be directed into and confined wholly within each flute, in such a way as to ultimately fill up each flute and compress the chips therein so compactly as to cause the compressed chips to become to all intents and purposes integral once again with the surrounding plastic material, whereby to securely lock the insert against reverse rotation out of the work piece recess.

REFERENCES:
patent: 2293930 (1942-08-01), Braendel
patent: 2823574 (1958-02-01), Rosan
patent: 3183531 (1965-05-01), McKewan
patent: 3233500 (1966-02-01), DeVellier
patent: 3244055 (1966-04-01), Schuermann et al.
patent: 3362281 (1968-01-01), Finlay
patent: 3405596 (1968-10-01), Neuschotz
patent: 3451080 (1969-06-01), McIntyre et al.
patent: 3492908 (1970-02-01), Thurston
patent: 3866509 (1975-02-01), Kraus et al.
patent: 3866510 (1975-02-01), Eibes et al.

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