Abstract: The hydraulic elevator system includes a synchronized telescoping cylinder with inner and outer reciprocating plungers mounted in a fixed cylinder. An hydraulic fluid pressure intensifier is connected to the pressure chamber for the outer plunger, and to the pressure chamber for the inner plunger. Solenoid valves control the flow of hydraulic fluid between the pressure intensifier and the two plunger pressure chambers. Switches mounted on the outer plunger control operation of the solenoid valves. When the inner plunger is too low relative to the outer plunger, when the elevator reaches the bottom landing, the pressure intensifier will raise the pressure in the inner plunger pressure chamber to appropriately lift the inner plunger. When the inner plunger is too high relative to the outer plunger, when the elevator reaches the bottom landing, the pressure intensifier will lower the pressure in the inner plunger pressure chamber, thus lowering the inner plunger.

Abstract: An elevator car is mounted on a frame by means of four pendulum rods suspended from the frame and attached to the floor of the car, one rod being disposed at each corner of the car. Load-weighing transducer assemblies are mounted on two diagonally opposed suspension rods to sense the weight of the car, and thereby monitor the number of persons on the elevator. A fixed capacity transducer can be used with a variety of different size and weight cars through the use of a pivot arm mounting assembly for the transducer.