Fail-secure lock system
US4691948A · kind A · utility
137Cited by
18References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1985 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Nov 27, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/1021
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fail-secure lock apparatus includes a normally pneumatically actuated locking bolt that can be manually operated to withdraw the same in the event of a power failure. The apparatus incorporates a standard key operated lockset connected to operate the pneumatic power drive means or, in the event of a power failure, is connected to rotate a cable reel mechanically to effect movement of the locking bolt to the unlocked position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.