Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1981-01-29
1982-10-12
Combs, Ervin M.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72469, B21H 306
Patent
active
043532330
ABSTRACT:
A self-threading fastener has circumferentially spaced thread-forming lobes on its thread, and with a thread depth at a maximum at the lobes and a minimum circumferentially between the lobes. A lobe in one turn is circumferentially offset from a lobe in an adjacent turn. The fastener is made on roll-threading dies each having grooves sinulsoidally varying in depth from a maximum at one region to a minimum at a second region. The spacing of the regions is equal to a fraction of the thread pitch multiplied by the cosecant of the thread helix angle.
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Amca International Corporation
Combs Ervin M.
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