Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1974-08-29
1976-01-27
Mehr, Milton S.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72469, B21H 306
Patent
active
039344444
ABSTRACT:
A vibration-resistant, thread-forming screw. The screw has an elongated shank made of a solid, one-piece body and provided with an interior core portion which, in any plane normal to the shank axis, has a circular configuration. Integral with and projecting radially from this core portion are a plurality of lobes uniformly distributed circumferentially about the shank axis and extending along spirals which progress angularly about the shank axis in a direction opposite to the thread. Each lobe has, in the direction in which the screw is turned into a body, an elongated leading leg which progresses gradually away from the shank axis in the latter direction of turning and a relatively short trailing leg which returns abruptly toward the shank axis before joining the leading leg of the next lobe. A specially shaped die for forming the screw.
REFERENCES:
patent: 2232337 (1941-02-01), Meersteiner
patent: 2352982 (1944-07-01), Tomalis
patent: 3246556 (1966-04-01), Phipard, Jr.
patent: 3247877 (1966-04-01), Evans
patent: 3459250 (1969-08-01), Tabor
patent: 3772720 (1973-11-01), Yamamoto
Mehr Milton S.
NL Industries Inc.
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