Safe elevator shaft and car roof access

An elevator installation comprising:

• an elevator controller;
• a drive system;
• an elevator car coupled to the drive system and movable under control of the elevator controller within an elevator shaft between floors of a building, wherein a shaft door is provided on each floor and includes a receptacle to receive a service tool of a technician;
• a safety circuit coupled to the elevator controller;
• and
• a detector mounted at the elevator car and coupled to the safety circuit,
• wherein the elevator controller is configured to:
• operate the drive system to move the elevator car along the elevator shaft in response to a call entered by the technician on a first floor;
• and
• deactivate the drive system in response to a control signal generated by the elevator controller when the safety circuit is interrupted, wherein interrupting the safety circuit is caused by the detector detecting a signal transmitted by the service tool positioned at the receptacle of the shaft door of the first floor and having an intensity value that below a predetermined threshold value, and wherein after deactivation of the drive system the moving elevator car comes to a halt with a roof being at a level to allow the technician to step on top of the roof from the first floor.

An elevator service tool comprising:

• a housing having an elongated part and a grip part, the elongated part configured to be introduced into a receptacle of a shaft door of a first floor of an elevator installation;
• a processor, a battery, and an indicator equipment arranged within the grip part;
• and
• a transducer arranged at a distal end of the elongated part, the transducer configured to deactivate a drive system of the elevator installation in response to a control signal generated by an elevator controller when a safety circuit is interrupted, wherein interrupting the safety circuit is caused by the detector detecting a signal transmitted by the transducer positioned at the receptacle of the shaft door of the first floor and having an intensity value that below a predetermined threshold value, and wherein after deactivation of the drive system the moving elevator car comes to a halt with a roof being at a level to allow the technician to step on top of the roof from the first floor.