Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Patent
1985-12-23
1987-08-18
Pate, III, William F.
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
81436, 292251, 411403, 411410, B25B 1348, B25B 1502, F16B 2300, F16B 3506
Patent
active
046868747
ABSTRACT:
A tamper-proof bolt including a shank with a threaded end portion merging into an unthreaded portion of lesser diameter merging into an enlarged unthreaded portion merging into the larger base of a frustoconical head also having a smaller base, an undulating curvilinear groove in the smaller base, an island having lobes within the groove, an outer side in the groove, an inner side in the groove formed by the sides of the lobes of the island, and a cylindrical boss on the island extending axially outwardly from the smaller base and having a radial dimension which is approximately equal to the minimum radial dimension of the undulating groove. A key having an undulating curvilinear ridge for reception in complementary mating engagement in the curvilinear undulating groove of the bolt and having portions of a minimum radial dimension of approximately the same size as the boss for rotating engagement relative thereto and having lobes for meshing engagement with the sides of the undulating curvilinar groove when it is received therein.
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McCalmon Miller G.
McCauley Durham S.
Gastel Joseph P.
McGard, Inc.
Pate III William F.
Safavi Michael
LandOfFree
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