Emergency exit lock system for doors
US4006471A · kind A · utility
45Cited by
5References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1975 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Jan 31, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/0908
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A lock system controls exiting and entering of personnel, particularly in public and commercial structures by means of an alarm and a panic bar and key system to operate a lock through a series of interlocking controls including an internal panic bar, an internal key lock, an external key lock and a supplemental manual control. Four modes of operation are provided in which the panic bar is at all times operative and the alarm is selectively operative to provide, in addition to panic bar actuation or in combination therewith, authorized passage, authorized exit only, free passage in both directions and free exit only.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.