Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Cap over the head
Patent
1987-05-01
1989-12-05
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Cap over the head
52410, 52512, F16B 4300, E04B 500
Patent
active
048849324
ABSTRACT:
A two-piece fastener system for installing roofing insulation. The fastener system includes a round disk having a hub extending outwardly from the center of one side. The outwardly extending end of the hub includes an opening adapted to accommodate a threaded fastener or nail. A thermally insulating plug is driven into the cavity through an opening at its opposite end to abut against a head of the fastener, preventing it from backing out. In one embodiment, the plug is retained by a lip that extends thereabove, and in a second embodiment, is retained by engagement of a ridge in a corresponding groove.
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Ringel Douglas E.
Smith Gary L.
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