Screw heads

Details Screw heads Screw heads

1974-09-12

1978-04-18

Frazier, Roy D.

Bridges

145 50A, F16B 2300

Patent

active

040844781

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 engagement with the screw during driving and also to provide a temporary stick-fit between the driver and the screw.

REFERENCES:
patent: 101207 (1870-03-01), Angar
patent: 1741349 (1929-12-01), Sullivan
patent: 1997422 (1935-04-01), Lorenzen et al.
patent: 2474994 (1949-07-01), Tomalis
patent: 2566055 (1951-08-01), Daderko et al.
patent: 2567466 (1951-09-01), Bartlett
patent: 2676510 (1954-04-01), Hodell
patent: 2847894 (1958-08-01), Smith et al.
patent: 3584667 (1971-06-01), Reiland
patent: 3656396 (1970-08-01), Gutshall
patent: 3854372 (1974-12-01), Gutshall

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