Security fastener and drive tool for driving both security faste

Details Security fastener and drive tool for driving both security faste Security fastener and drive tool for driving both security faste

1997-05-02

2000-02-15

Saether, Flemming

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

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

Head driving structure

411911, 411429, F16B 2300, F16B 3714

Patent

active

060245220

ABSTRACT:
A security fastener including a body having a circumferential periphery and an end wall, a curvilinear groove in the end wall, a plurality of circumferentially spaced depressions extending inwardly into said circumferential periphery from said end wall and having a bottom wall and first and second side walls, junctions having radii between the bottom wall and the side walls. One of the side walls extends at a greater angle to the axis of the fastener than the other side wall, which is engaged by the driving tool. A driving tool for driving both the foregoing security fastener and a conventional hexagonal fastener including a body having a bore with a plurality of axially extending splines for selectively engaging either the above-mentioned side wall of the depression of the security fastener or a plurality of sides of the hexagonal fastener.

REFERENCES:
patent: 1071796 (1913-09-01), Reichardt
patent: 2375249 (1945-05-01), Richer
patent: 3134292 (1964-05-01), Walton
patent: 3302672 (1967-02-01), Walton
patent: 3929152 (1975-12-01), Graham
patent: 4223585 (1980-09-01), Barth et al.
patent: 4569259 (1986-02-01), Rubin
patent: 4616535 (1986-10-01), Chiavon
patent: 4712586 (1987-12-01), McCauley et al.
patent: 4945789 (1990-08-01), Martinengo
patent: 5251520 (1993-10-01), Lanham
patent: 5449260 (1995-09-01), Whittle

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