Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut
Patent
1985-08-27
1989-10-24
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed bolt or screw with threads and complementary nut
411371, 411542, F16B 3300
Patent
active
048758183
ABSTRACT:
A fastener includes a threaded shank with a driving head on one end and a washer of resiliently yieldable material encircling the shank and disposed beneath the head to be compressed between the latter and a workpiece as the shank is driven into the workpiece. The head includes a skirt engaging the washer, the underside of the skirt being concave and being formed with an annular rib. As the washer is compressed, the rib exerts a downward force and produces a sealing circle between the washer and the workpiece. At the same time, the inner side of the rib forces the washer downwardly and inwardly to form a seal around the shank. The outer side of the rib forces the washer downwardly and outwardly against a flange on the periphery of the skirt, the flange trapping and retaining the washer in the space defined by the underside of the skirt.
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Brueske Curtis B.
Elco Industries, Inc.
Smith Gary L.
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