Patent ID: 11912539
Assignee: INVENTIO AG
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A method for erecting an elevator installation, wherein the elevator installation includes a first guide rail strand and a second guide rail strand for guiding an elevator car along a travel path in an elevator shaft, the method comprising the steps of:
providing a self-propelled elevator car and a drive system in the elevator shaft, the drive system having a primary part attached to the elevator car and a secondary part including the first and second guide rail strands attached along the travel path, wherein the primary part of the drive system has a plurality of driven friction wheels with at least two of the driven friction wheels pressed against each of two opposing guide surfaces of the first and second guide rail strands to drive the elevator car;
controlling a first rotational speed of the driven friction wheels pressing on guide surface of the first guide rail strand and controlling a second rotational speed of the driven friction wheels pressing on the guide surface of the second guide rail strand to move the elevator car along the travel path;
adjusting the first rotational speed and the second rotational speed independently of one another;
wherein the first guide rail strand lies in a first plane and the second guide rail strand lies in a second plane extending parallel with the first plane, and, in a centered state of the elevator car, a center of the elevator car is located on a center plane extending in parallel with the first and second planes; and
when a deviation of the elevator car center from the center plane is detected, changing at least one of the first rotational speed and the second rotational speed such that as the elevator car moves along the travel path, the elevator car center moves toward the center plane.