Elevator – industrial lift truck – or stationary lift for vehicle – With barrier for regulating access to load support – Includes motor or motor driven linkage for shifting barrier
Patent
1997-01-27
1997-12-09
Nappi, Robert
Elevator, industrial lift truck, or stationary lift for vehicle
With barrier for regulating access to load support
Includes motor or motor driven linkage for shifting barrier
250221, 187392, B66B 1320
Patent
active
056963629
ABSTRACT:
An apparatus for detecting weak beams in an beam detection system includes a plurality of emitters for radiating beams of energy, a plurality of detectors for providing detector signals in response to the beams of energy radiated by said plurality of emitters and means for detecting if the beams radiated by said plurality of emitters are weak. If weak beam is detected, the beam is determined inoperative by the obstruction detection system and is not considered in subsequent obstruction detection.
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Copy of Austrian Search Report Serial No. 9501604-4 dated Nov. 4, 1996.
Nappi Robert
Otis Elevator Company
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