Door operation control apparatus
US4383206A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1981 |
| Grant date | May 10, 1983 |
| Priority date | — |
| Expiry date | Jul 8, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/106
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A motor for operating the door is controlled for forward and reverse rotations and stoppage by a control circuit responsive to an operation command signal, an upper-lower limit signal, an obstruction detection signal and a maximum drive time over signal, thus controlling the door stepwise for opening, stoppage, closing, stoppage and opening in that order. Upon generation of an obstruction detection signal or a maximum drive time over signal during the closing operation, the control circuit controls the motor in a manner to open the door for a certain period of time, and subsequently upon application of an operation command signal, the control circuit is set in a manner to open the door again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.