Self-penetrating fastener for fastening roofing panels to metal

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element – Having resilient securing structure on shank

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Details

411387, 411 74, F16B 1506

Patent

active

043951740

ABSTRACT:
A fastener for anchoring a sheet-metal roofing panel to the top horizontal web of a roof-supporting sheet-metal beam, comprises a headed shank having an enlarged tip end constructed to penetrate said roofing panel and the underlying web of the panel's supporting beam, by being either percussively driven or rotatingly bored therethrough. In one species, an elastic plastic sleeve, which embraces the shank, has (1) a series of molded rings forming stepped seats engageable under the penetrated beam web and (2) a dome-shaped capping flange resiliently engageable down against the upper surface of the roofing panel. In a second species, a metallic sleeve, split for expanded slip-over engagement with the shank of the fastener, has vertical rows of struck-out anchoring fingers; and a resilient dome-shaped member is resiliently squeezed between the head of the fastener and the upper surface of the roofing panel. Said member may include a bowed spring-steel cross-shaped element.

REFERENCES:
patent: 2650516 (1953-09-01), Poupitch
patent: 4003175 (1977-01-01), Patry
patent: 4241639 (1980-12-01), Baer
patent: 4261243 (1981-04-01), Palmer

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