Method of producing a vibration resistant fastener

Details Method of producing a vibration resistant fastener Method of producing a vibration resistant fastener

1977-10-17

1979-01-30

Combs, E. M.

72 88, 72469, B21H 306

Patent

active

041364163

ABSTRACT:
A vibration resistant threaded fastener such as a set screw and method of forming the fastener wherein the load bearing flank of the thread surface of the screw is provided with a series of serrations. Each serration is formed with an inclined ramp terminating in a buttress forming a skewed angle with the radius of the fastener. The ramp surface is inclined in the direction of tightening the fastener so that the buttress presents a surface tending to act against rotation of the fastener to preclude its loosening. In forming the vibration resistant fastener a pair of flat thread roll dies may be used. Each die is provided with a mating segment near the end of the effective thread forming portion of the die having a configuration designed to impart the ramp and buttress serrations on the load bearing flank of the fastener rolled between the dies.

REFERENCES:
patent: 3078899 (1963-02-01), MacLean et al.
patent: 3339389 (1967-09-01), Mosow
patent: 3459250 (1969-08-01), Tabor
patent: 3605845 (1971-09-01), Junker
patent: 3825051 (1974-07-01), Sigmund

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