Screw with a convenient screw head

Details Screw with a convenient screw head Screw with a convenient screw head

2008-01-08

2008-01-08

Saether, Flemming (Department: 3677)

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

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

Head driving structure

C411S404000

Reexamination Certificate

active

11271758

ABSTRACT:
A screw has a convenient head, wherein an engaging concavity is defined. Said engaging concavity includes a central portion and a plurality of radial recesses disposed around and in communication with the central portion. Each radial recess has two insides with one inside parallels to the extension line and the other inside encloses an angle with the extension line, an end surface and an opening with a smaller width defined on the junction of the recesses and the centre portion.

REFERENCES:
patent: 2402342 (1946-06-01), Phillips
patent: 2445525 (1948-07-01), Gulden
patent: 2764197 (1956-09-01), Torresen
patent: RE24878 (1960-09-01), Smith et al.
patent: 3170364 (1965-02-01), Johnson et al.
patent: 5957645 (1999-09-01), Stacy
patent: 7147421 (2006-12-01), Suzuki

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