Interpenetrating nailable fastener for sheet metal

Details Interpenetrating nailable fastener for sheet metal Interpenetrating nailable fastener for sheet metal

1978-03-20

1980-11-04

Holko, Thomas J.

F16B 1500

Patent

active

042312809

ABSTRACT:
For securing such materials as insulation to sheet metal, a nailable fastener has at one end of its metal shank three or more lobes which interpenetrate the sheet metal and bend radially outward to become firmly embedded in the sheet. Each lobe of the fastener, as manufactured, has an inner camming surface which slopes outward to the rounded outer surface, which is a continuation of the generally cylindrical shank. The intersection of these two surfaces forms a semi-elliptical cutting edge terminating in a tip. The tip and the cutting edge progressively slit and raise a pocket in the sheet for each lobe, as its inner camming surface bends the lobe outward. The resulting radial interpenetration secures and stabilizes the fastener.

REFERENCES:
patent: 1052682 (1913-02-01), McCrea
patent: 1108483 (1914-08-01), Abramson
patent: 2283243 (1942-05-01), Vatet
patent: 4003286 (1977-01-01), Hallock

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