초록 ▼

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

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.

대표청구항 ▼

In a structure having a pair of flanges with a space therebetween with aligned holes in said flanges, a locking bolt structure extending through said aligned holes comprising an elongated bolt member, first and second externally threaded ends on said elongated bolt member, first and second nuts of s

In a structure having a pair of flanges with a space therebetween with aligned holes in said flanges, a locking bolt structure extending through said aligned holes comprising an elongated bolt member, first and second externally threaded ends on said elongated bolt member, first and second nuts of solid of revolution configuration, first and second internally threaded bores on said first and second nuts, respectively, for mating engagement with said first and second externally threaded ends, respectively, first and second outer faces on said first and second nuts, respectively, first and second key-receiving depressions of curved endless configuration in said first and second faces, respectively, for receiving mating key members for selectively tightening and loosening said nuts, a hardened central portion on said elongated bolt member intermediate said first and second externally threaded ends, said hardened central portion being located in said space between said flanges, relatively ductile ends on said bolt member outwardly of said central portion, and a relatively ductile core within said hardened central portion.