Multi-tier security fastener

Details Multi-tier security fastener Multi-tier security fastener

1997-10-06

2000-01-25

Saether, Flemming

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

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

Head driving structure

411402, 411910, 811211, 811244, 81451, 81436, F16B 2300

Patent

active

060171774

ABSTRACT:
A multi-tier security fastener in the nature of a nut or bolt having a body with a first tier having a lobed drive surface, and second and third cylindrical tiers on opposite sides of the first tier, with all three tiers having different effective diameters. The second and third cylindrical tiers can have irregularities in the nature of a lobe or a depression.

REFERENCES:
patent: 1458956 (1923-06-01), Sayer
patent: 3519979 (1970-07-01), Bodenstein
patent: 3888144 (1975-06-01), Parsons
patent: 4170918 (1979-10-01), Burge
patent: 4189976 (1980-02-01), Becker
patent: 4258596 (1981-03-01), Bisbing
patent: 4380942 (1983-04-01), Fenton
patent: 4648293 (1987-03-01), McCauley
patent: 4693655 (1987-09-01), Omori
patent: 4805495 (1989-02-01), Tauber
patent: 4897008 (1990-01-01), Parks
patent: 5469726 (1995-11-01), Rushing

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