Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes fluid supporting ram in drive-means
Patent
1995-04-28
1997-02-18
Terrell, William E.
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes fluid supporting ram in drive-means
187394, B66B 904
Patent
active
056033907
ABSTRACT:
A control system for controlling the motion of a hydraulic elevator calculates a deceleration distance based upon the elevator velocity and begins the deceleration phase of the elevator motion upon the elevator reaching the calculated distance from the landing. In a particular embodiment, the control system includes a hydraulic valve, a space encoder, and a controller. The space encoder produces velocity and position measurements. The controller uses the velocity inputs to determine the deceleration distance and, upon the elevator car 14 reaching the calculated distance from the landing as measured by the position inputs from the space encoder, commands the hydraulic valve to actuate and begin the deceleration phase. In an alternate embodiment, an interface unit connected between the controller and the hydraulic valve calculates a delay between the deceleration command based upon a predetermined distance and the calculated deceleration distance based upon car velocity. Upon expiration of the delay, the interface unit commands the hydraulic valve to actuate and begins the deceleration phase.
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Foschini Gianluca
Toschi Renzo
Kelly Tamara
Otis Elevator Company
Terrell William E.
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