Impact resistant electromagnetic lock
US5758913A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1996 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Feb 20, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An impact resistant electromagnetic lock includes an electromagnet mounted on a door frame, a ferromagnetic strike plate, and an impact-absorbing assembly for mounting the strike plate to the door. The impact-absorbing assembly fits largely within the door, and includes both a plunger coupled to the strike plate and a spring. When an inertial force directed to forcing the door open such as a kick is directed against the door, the plunger compresses the spring. The resilience provided by the spring allows the door a limited amount of inertia-absorbing linear movement, thus greatly decreasing the maximum force experienced by the door and correspondingly increasing the ability of the door to withstand the inertial attack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.