Door operation control apparatus
US4393342A · kind A · utility
24Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Dec 9, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/106
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A motor for driving a garage door is controlled by a control unit, which counts the time required for the garage door to move between an upper limit switch and a lower limit switch. The control unit sets a comparison reference time on the basis of the time thus counted, and controls the motor in such a manner that the motor driving does not continue for a period of time longer than the comparison reference time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.