Capped bolt

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Cap over the head

Patent

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Details

F16B 2300

Patent

active

043166903

ABSTRACT:
A capped bolt having a threaded shank adapted to receive a nut thereon and a bolt head laterally larger than the shank having a lead surface adjacent the threads. A rigid thermoplastic cap capable of cold flow deformation substantially surrounds the bolt head and has an annular lip in contact with the lead surface having a free end thereof near the shank threads. The annular lip has both exterior surfaces thereof facing the shank such that a line tangent to each surface intersects the shank. When the nut is tightened on the bolt, the lip cold flows into an oversized aperture of at least one of the two or more members being bolted and between the threads providing a hermetic seal.

REFERENCES:
patent: 2908309 (1959-10-01), Brill
patent: 2983534 (1961-05-01), Heller et al.
patent: 3557654 (1971-01-01), Weidner, Jr.
patent: 3618444 (1971-11-01), Kay et al.
patent: 3885492 (1975-05-01), Gutshall
patent: 4154138 (1979-05-01), Melone
patent: 4235147 (1980-11-01), Weidner, Jr.

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