Armadillo tamper resistant bolt and head protector

Details Armadillo tamper resistant bolt and head protector Armadillo tamper resistant bolt and head protector

1991-07-15

1992-07-14

Lindsey, Rodney M.

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

Headed fastener element with nut, washer, securing means or cap

Cap over the head

411377, 411429, 411910, A47G 300

Patent

active

051297701

ABSTRACT:
A tamper proof protective cover for cap screws. The cover is installed over either the head or nut, depending which is exposed to vandalism. There is a hemispherical or dome shaped surface with a slightly angled bottom to prevent getting a grip on the cover. A blind bore with a compression ring and gripping rings extending from the flat bottom surface into the blind bore. The protective cover is installed using a special tool by placing the bore over the head or nut of a cap screw and driving down on the head or nut. The gripping rings engage and either binds with or penetrates the edges of the head or nut.

REFERENCES:
patent: 3298272 (1967-01-01), Henderson
patent: 4293243 (1981-10-01), Graybeal et al.
patent: 4582462 (1986-04-01), Thiel
patent: 4907929 (1990-03-01), Johnston, Jr.

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