Safety lock mechanism
US4049302A · kind A · utility
2Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1975 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | Dec 9, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a safety lock mechanism, including a locking bolt pivotable about a door hinge so as to be able to swing to a door-locking position and an electromagnet provided to retain said bolt in said door-locking position, apparatus arranged, so that upon the interruption of current supplied to said electromagnet and the application of a force on the door leaf to open the door, said bolt is urged to pivot to a door-releasing position, thus ensuring that the door is openable under all circumstances, even when considerable pressure is exerted thereon, such as e.g. from crowds of people in a panic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.