Safety mechanism for high security lock
US4601504A · kind A · utility
3Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1984 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | Apr 23, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/552
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A high security lock of the type having a base, a bolt which moves on the base and engages a strike, and a dead lock tripper which interacts with the strike to automatically lock the bolt is improved by including a lock prevent member in association with the bolt. The lock prevent member inhibits the bolt from moving from an unlocked to a locked position in spite of the dead lock tripper interacting with the strike. A secondary key can be used to inactivate the lock prevent member such that the lock returns to its normal mode of operation with the interaction of the dead lock tripper and the strike automatically locking the lock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.