Bolt-lock structure
US4480513A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1981 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Nov 16, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L23/003
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.