Apparatus for controlling the operation of a door
US4401346A · kind A · utility
16Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Mar 19, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for controlling the operation of a door provided with a door closer comprises a body of ferromagnetic material mounted on a portion of a building adjacent the door, an electromagnet mounted on the door (the positions of the electromagnet and body may be reversed), a power supply, an actuator and a timer which connects the electromagnet to the power supply upon actuation by the actuator and disconnects the electromagnet from the power supply after a predetermined interval, thereby allowing the door closer to close the door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.