Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Separate head element
Patent
1980-06-19
1982-03-23
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Separate head element
10 27R, F16B 3500
Patent
active
043210015
ABSTRACT:
A bolt formed of two separate members, one of the members defining the shank and wrench-engagement portions of the bolt, the other member defining a work-engagement washer-flange surface. This two-member construction minimizes the amount of upsetting required to form the wrench-engagement portion of the bolt, with resulting reduction in total energy costs to form the bolt. The two-member construction provides other advantages, such as possible use of harder, higher tensile strength materials having improved wear characteristics, the elimination of a potential stress riser condition at the juncture of the shank and head portions, and possible use of different materials for the shank and head flange areas of the bolt.
REFERENCES:
patent: 1172406 (1916-02-01), Taylor
patent: 1742201 (1930-01-01), Drissner
patent: 2153702 (1939-04-01), Tighe
patent: 2237236 (1941-04-01), Matthews
patent: 2985898 (1961-05-01), Goude
patent: 3611862 (1971-10-01), Walker
patent: 3978758 (1976-09-01), Bright
Britts Ramon S.
Edelberg Nathan
McRae John E.
Taucher Peter A.
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