Breakaway tamperproof fastener

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

Patent

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Details

411509, 411908, 411913, F16B 1900

Patent

active

056516525

ABSTRACT:
An elongate fastener that may not be removed without destruction is provided for insertion in adjacent cooperating holes defined in box structures and their closure elements to maintain closure. The fastener defines a head, larger than the hole to carry the fastener, that structurally carries a peripherally extending tab to aid manual manipulation. The head structurally connects an elongate perpendicularly extending body that fits in the cooperating holes and is formed by spaced peripheral webs that carry barb-like fasteners in their end portions distal from the head that allow insertion of the body through a hole by deformation, but thereafter expand responsive to retentent memory to prevent removal. The interconnection of the body and head is weaker in tensile strength than the material on either side of the interconnection so that the head may be removed from the body by manual manipulation of the peripheral tab, without the use of tools, to allow opening of the box structure.

REFERENCES:
patent: 930113 (1909-08-01), Adams
patent: 1690853 (1928-11-01), Behrman
patent: 2657948 (1953-11-01), Sturtevant
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patent: 3727271 (1973-04-01), Znamirowski
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patent: 4682688 (1987-07-01), Budert
patent: 4715095 (1987-12-01), Takahashi
patent: 5012941 (1991-05-01), Abrams et al.
patent: 5173026 (1992-12-01), Cordola et al.
patent: 5551816 (1996-09-01), Brewer et al.

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