Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1982-03-26
1984-07-03
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
81125, 81451, 411375, F16B 2300
Patent
active
044576544
ABSTRACT:
A fastener comprising a head, a shank, and a cap. The head has a recess in its top surface dimensioned to accommodate an appropriate tool for installing the fastener. The cap covers a substantial portion of the head and conforms closely to the head, extending into the recess in spaced relation to a substantial portion of the inner surfaces of the recess and cooperating with those surfaces during insertion of the installation tool into the recess to present appropriate dimensions to the tool to resiliently grip the tool and accommodate the tool for proper installation of the fastener. The cap is made of resilient material preferably stainless steel to provide corrosion resistance of the fastener once the fastener is fully inserted into the workpiece. Additionally, the fastener is designed to accommodate and, through interaction of the cap and installation tool, resiliently engage commonly known standard installation tools to provide easy and safe installation of such fasteners yet permit easy disengagement of an installation tool after full installation of the fastener within a workpiece.
REFERENCES:
patent: 1433783 (1922-10-01), Carr
patent: 2627778 (1953-02-01), Hodell
patent: 2902071 (1959-09-01), La Pointe et al.
patent: 3286749 (1966-11-01), Learned
patent: 3298410 (1967-01-01), Morifuji
patent: 3517714 (1970-06-01), Desbarats
patent: 3885492 (1975-05-01), Gutshall
Buckman Thomas W.
Gall Lloyd A.
Illinois Tool Works Inc.
Mondul Donald D.
Roche David I.
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