Electricity: motive power systems – Motor-reversing – Automatic and/or with time-delay means
Patent
1995-06-05
1997-08-12
Ro, Bentsu
Electricity: motive power systems
Motor-reversing
Automatic and/or with time-delay means
318468, 318480, 49 25, 49 26, E05F 1520
Patent
active
056569009
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.
REFERENCES:
patent: 4922168 (1990-05-01), Waggamon et al.
patent: 5191268 (1993-03-01), Duhame
patent: 5357183 (1994-10-01), Lin
Michel Andrew J.
Willmott Colin B.
Ro Bentsu
The Chamberlain Group, Inc.
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