Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1996-05-09
1997-07-15
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
411911, 411919, F16B 2300, F16B 3506
Patent
active
056477120
ABSTRACT:
A threaded fastener which is constructed to be turned in one direction by a square socket drive includes a threaded stem and an integral modified head arranged with four raised projections which are circumferentially spaced. Each of the four raised projections includes a substantially flat wall portion and a curved and inclined ramp portion. The four flat wall portions effectively define a square center region which is compatibly sized to receive a one-half inch square socket drive. Rotation of the square socket drive in a counterclockwise direction causes the sides of the square socket drive to engage the flat wall portions so as to turn the threaded fastener in a counterclockwise direction. Any attempt to rotate the square socket drive in a clockwise direction causes the sides of the square socket drive to ride up along the ramp portions and ride out of engagement with the modified head of the threaded fastener. In a related embodiment of the present invention, the four raised projections have their orientation reversed so that the square socket drive is effective to threadedly advance the fastener when the drive is turned in a clockwise direction. Likewise, in this alternate embodiment, when the square socket drive is turned in a counterclockwise direction, it rides up along the ramp portions and come out of engagement with the modified head. As described, the present invention includes a one directional threaded fastener which is manipulated by a square socket drive.
REFERENCES:
patent: 1506500 (1924-08-01), Ripamonti et al.
patent: 3161450 (1964-12-01), Goodenough
patent: 3253625 (1966-05-01), Oestereicher
patent: 3313198 (1967-04-01), Walton
patent: 3673912 (1972-07-01), Herr
patent: 4429599 (1984-02-01), La Sante, Sr.
patent: 5171117 (1992-12-01), Seidl
Demirdogen A. Caner
Miller Paul D.
Fleetguard Inc.
Wilson Neill R.
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