Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Torque responsive nut or bolt driving connection – Frangible connection
Patent
1996-03-01
1998-02-03
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Torque responsive nut or bolt driving connection
Frangible connection
41410, 41910, F16B 3100, F16B 4100
Patent
active
057137056
ABSTRACT:
A non-removable, tamper-proof bolt has a threaded shaft, a permanent head, and a torque head which is sheared off from the assembly when the bolt is fastened. The shaft has an opening formed therein at the forward screw end, and the opening has a profile for engagement with a torque tool. The torque head is formed with a hole as well which extends through the entire torque head coaxially with the threaded shaft. The torque head is attached to the permanent head by the intermediary of a bridge defined around said hole in the torque head. Once the torque head is sheared off, the bolt cannot be turned until the opening formed in the forward screw end is exposed by drilling through the shaft from the permanent head inwardly.
REFERENCES:
patent: 2083054 (1937-06-01), Cline
patent: 3182757 (1965-05-01), Reiland
patent: 3424212 (1969-01-01), Kemper
patent: 3498174 (1970-03-01), Schuster
patent: 4021892 (1977-05-01), Piper
patent: 4502825 (1985-03-01), Yamada
patent: 4819522 (1989-04-01), Stinson
patent: 4874275 (1989-10-01), Gotman
patent: 5120168 (1992-06-01), Padula
patent: 5199834 (1993-04-01), Seidl et al.
Greenberg Laurence A.
Lerner Herbert L.
Saether Flemming
Stemer Werner H.
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