Patent ID: 8397437

Claim:
A method for installing guide rails, such as car guide rails and/or counterweight guide rails, in an elevator shaft or similar structure, said method comprising the steps of: installing the guide rails by assembly in phases starting from the bottom of the elevator shaft by placing one on top of the other guide rail sections that are shorter than the whole length of the guide rail and by aligning the guide rail sections perpendicularly by means of a laser beam produced by a direction laser; moving the direction laser upwards along with progressive assembly of the guide rail; as assembly progresses, supporting the direction laser on a fixed structure of the elevator shaft, the fixed structure being the wall of the elevator shaft or a fixing element securely fixed to the wall of the elevator shaft, in the proximity of the top end of each topmost perpendicularly aligned guide rail section for alignment of the next guide rail section to be installed in the vertical direction; and repeating the steps of installing, moving and supporting until the whole guide rail is assembled.