Recessed screw heads and drivers

Details Recessed screw heads and drivers Recessed screw heads and drivers

1977-10-31

1980-02-12

Simpson, Othell M.

Bridges

145 50D, B25B 1500

Patent

active

041878922

ABSTRACT:
A screw head is provided with projections on selected of the driver-engageable surfaces of the head to interlock with surfaces and edges of the driver to reduce the tendency for the driver to slip out of the recess during driving and also to provide a temporary stick-fit between the driver and the recess.

REFERENCES:
patent: 961515 (1910-06-01), Montgomery
patent: 1738405 (1929-12-01), Thal
patent: 1899489 (1933-02-01), Wickbergh
patent: 2046837 (1936-07-01), Phillips
patent: 2116775 (1938-05-01), Blackburn
patent: 2859782 (1958-11-01), Cummaro
patent: 3133568 (1964-05-01), Reed
patent: 3913647 (1975-10-01), Arnn

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