Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1989-11-29
1991-06-04
Nicholson, Eric R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
411919, 411410, 411404, F16B 3500, F16B 2300
Patent
active
050209540
ABSTRACT:
A combined socket is provided, whereby a screw can be driven either by a cross tipped Phillips type driver or by a square Robertson type driver. The wings of the socket have end walls that curve convexly to permit the end wall to be clear of the corner of the square, right down to the bottom of the end wall. The vertical side faces of the socket have portions inclined at different angles. The upper and lower portions are inclined respectively at a greater angle to the vertical and a smaller angle to the vertical as compared to the side faces of a conventional Robertson type socket allowing a Robertson type driver to contact the side faces part way along the faces.
REFERENCES:
patent: 975285 (1910-11-01), Robertson
patent: 1910182 (1933-05-01), Robertson
patent: 2046837 (1936-07-01), Phillips
patent: 2082748 (1937-06-01), Brown
patent: 2173707 (1939-09-01), Brown
patent: 2216381 (1940-10-01), West et al.
patent: 2285460 (1942-06-01), Portell
patent: 2285461 (1942-07-01), Purtell
patent: 2859782 (1958-11-01), Cummaro
patent: 3120012 (1964-02-01), Muenchinger
patent: 3237506 (1966-03-01), Muenchinger
patent: 3283638 (1966-11-01), Ansingh
patent: 3728892 (1973-04-01), Sangster
patent: 3972083 (1976-08-01), Dreger
patent: 4089357 (1978-05-01), Gill
Intools, Limited
Nicholson Eric R.
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