Patent ID: 6945363
Filing Date: 2005-09-20
Classification: B66B

Abstract:
1. A method of monitoring shaft doors of a elevator installation with a elevator shaft and a elevator car vertically movable along one shaft wall, wherein the shaft wall has several shaft doors each with at least one horizontally displaceable shaft door panel, wherein when the elevator car stops at a floor at least one shaft door panel of the shaft door respectively opposite the elevator car is opened and closed by a corresponding car door panel, wherein the elevator installation includes an elevator control by which the movements of the elevator car, the car door panel and thus the respectively corresponding shaft door panel are controlled, and wherein a closed setting of the shaft door panel is monitored by at least one contactlessly-acting shall door monitoring sensor emitting electromagnetic waves, comprising the steps of: a. emitting from an emitter at least during specific detection phases a beam in the form of eleotromagnetic waves, the beam extending along a generally straight line path over several floors in the elevator shaft; b. detecting the beam with a receiver arranged so that when one of the shaft door panels is not completely closed and/or a shaft door lock is not disposed in locking state the beam is influenced in such a manner that it is recognized by the receiver that the one of the shaft doors is not completely closed and/or not locked; and c. generating a disturbance signal from the shaft door monitoring sensor to the elevator control in response to the influenced beam.