FLOOR POSITION CORRECTING APPARATUS FOR HYDRAULIC ELEVATOR AND CYLINDER FOR HYDRAULIC ELEVATOR

摘要

PURPOSE:To provide a floor position correcting apparatus for an elevator which can be installed in a lift well of the elevator, give quickly a response to the floor position correction and simplify the constitution. CONSTITUTION:A floor correcting cylinder 4 having a large piston 4a and small piston 4b has the large piston side connected to a main cylinder 2. The large piston side chamber 2b is connected to the small piston side chamber 4g through a pump 5, change-over valve 6 and piping members 7-9. A controller 11 drives a motor 12 to controllably drive the pump 5 according to a signal from a position detector 10 so that working oil reciprocally flows between the large piston side chamber 2b and small piston side chamber 4g. Thus, the position of a plunger 2a is vertically controlled so that the positional correction of a car to a floor 1 can be performed.