Patent ID: 9599467
Date: 2017-03-21
CPC Classifications: B66B,G01C

Claim:
1. A method for testing the functionality of an elevator in which a car having a lower side is movable in an elevator shaft having an elevator shaft excavation space and a characteristic value is ascertained under predefined test conditions to determine the proper functionality of the elevator, comprising measuring a change of distance between the car and a fixed measuring point in the elevator shaft in a movement direction of the car by an optical distance measuring device and a reflector, the optical measuring device being attached either to the fixed measuring point or to the car and the reflector is correspondingly attached to the car or the fixed measuring point, whereby said optical distance measuring device transmits a light beam to the reflector and received a reflected light of the reflector for measuring said distance, and automatically keeping the transmitted light beam of the transmitted light beam of the optical distance measuring device in alignment with the reflector by a closed-loop control for detecting whether or not the transmitted light beam is reflected at the reflector while moving the transmitted light beam in accordance with a predetermined algorithm along a first straight line and thereafter along a second straight line which is perpendicular to the first straight line and thereafter along a circle.