Bolt-lock structure

Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...

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Details

81461, 411389, 411403, 411429, B25B 1348

Patent

active

044805136

ABSTRACT:
A bolt type of lock structure including an elongated bolt member, first and second externally threaded ends on the bolt member, first and second nuts of frustoconical configuration threadably mounted on the first and second threaded ends, first and second faces on the nuts for receiving key members for tightening and loosening the nuts, an anaerobic thread locking compound on the threads, the bolt member being relatively soft throughout to withstand impact and having a hardened zone in a central area wherein it is exposed to chiseling or sawing. A nut of the type described above including a threaded bore in the face which receives a screw for securing the key member thereto. A stud having oppositely threaded ends and an irregular axial bore in one end for receiving a wrench and a hardened surface portion between the threaded ends.

REFERENCES:
patent: 1457994 (1923-06-01), Nedland
patent: 2133146 (1938-10-01), Larrecq
patent: 3554258 (1971-01-01), Duffy
patent: 3874258 (1975-04-01), Semola et al.
patent: 4191677 (1980-03-01), Strand
patent: 4253509 (1981-03-01), Collet
patent: 4373309 (1983-02-01), Lutz

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