1978-10-11
1981-04-07
Combs, Ervin M.
72 90, B21H 302
Patent
active
042597587
ABSTRACT:
A self-tapping screw of the type including a head, a depending cylindrical portion, a tapered point and a thread running continuously from the cylindrical portion onto the tapered point and a method of making same are disclosed. A screw blank is formed with a constant diameter cylindrical shank, the lower end of which includes a depression or concavity. Cooperating, relatively moving dies including opposed faces defining a tapered slot within which the blank is received cut a continuous thread into the blank. The concavity in the blank permits the metal to flow more readily resulting in crisp threads and a significant increase in the life of the thread rolling dies.
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Combs Ervin M.
Keeler Corporation
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