Elevator – industrial lift truck – or stationary lift for vehicle – With barrier for regulating access to load support – Including slideably mounted barrier on load support
Patent
1997-11-10
1999-07-06
Terrell, William E.
Elevator, industrial lift truck, or stationary lift for vehicle
With barrier for regulating access to load support
Including slideably mounted barrier on load support
187316, B66B 1306
Patent
active
059187050
ABSTRACT:
Opening of an elevator door by occupants of a car which is stalled between building floors is prevented by a locking member which is movable by an electrical actuator between a door locking position and a door releasing position. Opening is permitted at unlocking zones at which the car is at or close to a landing site at a building floor. An infrared emitter and an infrared detector carried by the car pass along opposite sides of a series of opaque door zone vanes situated along the path of car travel. The actuator retracts the locking member in response to blocking of the infrared path between the emitter and detector by a door zone vane. A timer delays the retraction for a period at least equal to the time required for passage of the car through an unlocking zone when it is traveling at rated speed past a floor at which it is not to be stopped.
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Advanced Microcontrols, Inc. "AMI EDR-02 GENERAL DOCUMENTATION", Feb. 28, 1996, pp. 1-1.
ADAMS Elevator Equipment Co., 4 page sales brochure entitled Hatch Latch(TM), copyrighted 1996.
O.D.I. Co., Door restrictor installation instructions, 7 pages + 3 pages of photos of actual unit, date unknown.
Crawford Gene O.
Terrell William E.
Zimmerman Harris
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