Recessed head screw

Details Recessed head screw Recessed head screw

1978-07-26

1980-05-13

Britts, Ramon S.

F16B 2300

Patent

active

042022444

ABSTRACT:
A screw head recess includes a generally frusto-conical central socket and radial slots interconnected by concave sections of the socket. Each slot is defined by two opposed wall surfaces which intersect with a bottom surface which slopes radially inwardly and downwardly along the axis of the screw. At least a portion of the junction between one sidewall and the bottom surface is curved to produce a camming surface for frictional engagement between the screw and a driving tool sufficient to provide a temporary stick-fit between the screw and the tool.

REFERENCES:
patent: 2397216 (1946-03-01), Stellin
patent: 2474994 (1949-07-01), Tomalis
patent: 2556155 (1951-06-01), Stellin
patent: 3295572 (1967-01-01), Wing
patent: 4084478 (1978-04-01), Simmons

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