Top module and method for closing off an elevator shaft of an elevator system

A method for installing an elevator system having an elevator shaft to be closed off at a top with a top module, the method comprising the following steps:

• providing the top module having a first top module side wall adjoining a top module ceiling, a first guide rail piece fixed to the first top module side wall by a bracket, and a drive unit connected to the first guide rail piece;
• wherein the top module is adapted to assume an operating state in which the first guide rail piece and the drive unit are in operating positions and a car of the elevator system can be moved in the elevator shaft closed off with the top module, sAs the top module is adapted to assume a transport state in which the first guide rail piece and the drive unit are in transport positions that deviate from the operating positions, and the drive unit and the first guide rail piece remain immovably connected in both the operating state and the transport state;
• bringing the top module into the transport state before placement on the elevator shaft;
• placing the top module on top of an unfinished part of the elevator shaft to close off the elevator shaft;
• and
• bringing the top module into the operating state after the placement on the elevator shaft.