Retro-reflective infrared safety sensor for garage door operators
US5656900A · kind A · utility
54Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/106
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A garage door operator has an electric motor controlled by a control unit. A transmission is connected to the motor to be driven thereby to open and close a garage door. An infrared obstacle detector is connected to the control unit and includes a unitary infrared pulse emitter and an infrared detector. A missing pulse detector is coupled to the infrared detector to generate a door opening signal if the door is closing when the pulses are absent due to the infrared being interrupted by an obstacle or not having been generated. The control unit receives the door opening signal and causes the electric motor to open the garage door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.