Head drive for threaded fastener

Details Head drive for threaded fastener Head drive for threaded fastener

1990-11-19

1992-08-11

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Head driving structure

411405, 411919, F16B 2300, F16B 3506

Patent

active

051374072

ABSTRACT:
A threaded fastener having a recess or projection in a head for engagement with a jointing equipment is disclosed. The recess or projection is composed of a center portion and radial portions extending radially outward of circumference of the center portion. Each of the radial portions includes a pair of straight line section and a rounded corner to prevent stress concentration for providing substantial strength against press-molding and applied torque.

REFERENCES:
patent: 2046839 (1936-07-01), Phillips et al.
patent: 2066484 (1937-01-01), Phillips
patent: 2129440 (1938-09-01), Olson
patent: 2445978 (1948-07-01), Stellin
patent: 2764197 (1956-09-01), Torresen
patent: 3352190 (1967-11-01), Carlson
patent: 3400626 (1968-09-01), Bergere
patent: 3584667 (1971-06-01), Reiland
patent: 4006660 (1977-02-01), Yamamoto et al.

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