Speed dictation apparatus
AssigneeOtis Elevator Company
InventorOtto A. Krauer
Life of this patent
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Abstract
Improved speed dictation apparatus for controlling the speed of an elevator car in which the deceleration of the elevator car is brought into conformity with that which would be provided by a distance controlled signal notwithstanding the continued application of a time controlled signal and the deceleration is made consistent regardless of the length of trip by controlling the speed of the car in accordance with the distance controlled signal before the car starts to decelerate and by controlling the conformity process with a dischargingcapacitive circuit which at the time the conformity process begins is charged to a voltage signifying the difference between the actual speed being dictated to the car and the speed the distance controlled signal is then dictating.
Claims5
Speed dictation apparatus for an elevator car comprising a function generator generating a voltage which varies continuously as a function of time and controls the car's acceleration on each trip, a landing selector mechanism generating a voltage which varies continuously as a function of the distance the car is from the selected landing at which it is to stop on each trip, said latter voltage controlling the car's deceleration on each trip, signal generating means operating on each trip in which the car does not attain its rated running speed and generating a signal to stop accelerating in response to the selection of the landing at which the car is to stop, and control equipment connected to said function generator and said landing selector mechanism and receiving both said time controlled voltage and said distance controlled voltage, said control equipment operating in response to said signal to stop accelerating on any trip and causing said distance controlled signal to control the speed of said car from before the car starts its deceleration for that trip by initiating before deceleration starts a gradual transfer from control in which said time controlled voltage predominates to control in which said distance controlled voltage predominates.
Dependencies are inferred from the claim text.