Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Cap over the head
Patent
1979-11-26
1981-10-20
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Cap over the head
411378, F16B 2700
Patent
active
042957672
ABSTRACT:
A corrosion resistant screw type fastener has a carbon steel threaded shank with a die cast zinc or aluminum head, and a reformable plastic washer positioned about the shank and partly received within the head. The shank has a retaining portion having a polygonical configuration and a cylindrical portion between the retaining portion and the threads. The retaining portion has a larger cross-sectional configuration than the cylindrical portion for preventing axial movement between the head and the shank. An annular recess is formed between the head and part of the cylindrical portion for receiving the washer which is thicker than the depth of the recess. When the fastener is threaded into the work the heat and pressure generated reform the washer to completely fill the recess and provide an effective seal against corrosive elements.
REFERENCES:
patent: 1208620 (1916-12-01), Moser
patent: 1867354 (1932-07-01), Dickson
patent: 3452636 (1969-07-01), Cohen et al.
patent: 3566738 (1971-03-01), Cupit
patent: 3803972 (1974-04-01), Deutsher
Britts Ramon S.
Ruderman Alan
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