Otis Elevator Company

Sven Knuth

Ralph S Stripling

Peter L Herkel

Mustapha Toutaoui

Raphael Pecek

An elevator systemis provided which comprises: a hoistwayaccessible by at least one hoistway door; at least one elevator carlocated in the hoistway; a hoistway door switchassociated with the at least one hoistway door; at least one inspection switch; at least one emergency stop switch; and an elevator controller. The elevator controlleris configured to monitor the hoistway door switch, the inspection switchand the emergency stop switchand to prevent inspection mode operation of the elevator caruntil at least one change of state is detected of each of the hoistway door switch, the inspection switchand the emergency stop switch

Elevator systems

An elevator safety device () is configured for restricting the movement of an elevator car () of an elevator system () along its pathway in order to prevent the elevator car () from moving beyond at least one limit position. The elevator safety device () is configured for performing at least one learning run () for setting the at least one limit position.

Elevator safety device

A method of updating at least one security certificate of a safety circuit of an elevator system includes: connecting the safety circuit with a communicator which is capable to communicate with a certification server; sending from the communicator to the safety circuit a security certificate update request for updating at least one security certificate stored within the safety circuit; the safety circuit sending a public key of a safety circuit security certificate associated with the safety circuit via the communicator to the certification server; the certification server checking whether the safety circuit security certificate associated with the received public key is included in a data base of known security certificates and not marked as compromised.

Growing community of inventors

Berlin, Germany

Sven Knuth