Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut
Patent
1990-06-04
1991-11-12
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed bolt or screw with threads and complementary nut
411 5, 411353, 411374, 411910, 292327, F16B 2118, F16B 3300
Patent
active
050643266
ABSTRACT:
Tamper proof service bolts for sealing boxcars, automobile hoods, gates and other enclosures, as well as gas and electric meters, railroad switches and the like. In a first preferred embodiment the tamper proof service bolts are characterized by special head service bolts, each having a base member and a collar secured to the base member by means of a connecting bolt having a specialized head recess for receiving a corresponding tool which is required for removing the connecting bolt and the collar from the base member. In another preferred embodiment of the invention retainer clip service bolts are provided, wherein a retainer clip is adapted to mount on each base member and in the collar when the collar is fitted over the base member, to secure the collar on the base member. In still another preferred embodiment a sacrifice head service bolt is provided where the collar is fitted on the base member and a sacrifice head having a thin, frangible neck is threaded on the base member, such that the bottom element of the sacrifice head is countersunk in the collar when the top element of the sacrifice head is stripped from the bottom element at the frangible neck. A cross-thread nipple service bolt is also provided, wherein the base member is fitted with an upward-standing, threaded stud for engaging dissimilar threads in a cross-thread collar such that the threaded nipple is irreversibly cross-threaded into the cross-thread collar.
REFERENCES:
patent: 2033371 (1936-03-01), Benaggio
patent: 2108316 (1938-02-01), Love
patent: 3951443 (1976-04-01), Barnaby
patent: 4037515 (1977-07-01), Kesselman
patent: 4225165 (1980-09-01), Kesselman
patent: 4521146 (1985-06-01), Wharton
patent: 4621230 (1986-11-01), Crouch et al.
patent: 4668143 (1987-05-01), Rotar
patent: 4786224 (1988-11-01), Wharton
patent: 4802700 (1989-02-01), Stevenson et al.
Davis Robert E.
England Frank R.
Harrison John M.
Wilson Neill R.
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