Elevator control for a generator-fed motor control system

Claim 1

IN AN ELEVATOR CONTROL SYSTEM HAVING A HOIST MOTOR AND A GENERATOR THAT SUPPLIES POWER TO THE MOTOR THROUGH A LOOP CIRCUIT, A PLURALITY OF RESISTOR UNITS IN SERIES IN THE GENERATOR FIELD CIRCUIT, AND ACCELERATION MEANS FOR CUTTING THE RESISTORS OUT OF THE CIRCUIT SUCCESSIVELY TO CHANGE THE VOLTAGE SUPPLIED BY THE GENERATOR TO THE HOIST MOTOR, THE IMPROVEMENT WHICH COMPRISES CAPACITORS CONNECTED IN PARALLEL WITH THE GENERATOR FIELD AND IN SERIES WITH THE RESISTOR UNITS, AND THE CAPACITY AND CHARGING TIME OF THE CAPACITORS BEING CORRELATED WITH THE CUTTING OUT OF SUCCESSIVE RESISTOR UNITS TO ELIMINATE CURRENT SURGES THAT PRODUCE IRREGULAR ACCELERATION OF THE ELEVATOR CAR AND RESULTING UNCOMFORTABLE SENSATIONS TO THE OCCUPANTS OF THE CAR, AND CHARACTERIZED BY THE MEANS FOR TIMING THE CUTTING OUT OF SUCCESSIVE RESISTOR UNITS BEING A PLURALITY OF TIMERS, ONE FOR EACH RESISTOR UNIT, AND SWITCH MEANS BY WHICH THE TIMING OUT OF ONE TIMER STARTS THE OPERATION OF THE NEXT TIMER.