Patent ID: 7140470

Claim:
Safety system for the elevator landing doors of an elevator fitted with an elevator control unit ( 5 ), and at each elevator landing door ( 21 ), electrical contacts ( 11 , 12 ) that indicate the locking state and the closing state of the elevator landing door, characterised in that it comprises: alarm signal devices ( 13 , 14 ), elevator landing door surveillance units ( 10 ), installed on each elevator landing door ( 12 ), each surveillance unit ( 10 ) comprising measuring modules ( 36 ) respectively connected to the electrical contacts ( 11 , 12 ) so as to receive the locking state and the closing state of the elevator landing door ( 21 ), the measuring modules ( 36 ) being connected to a processing unit ( 31 ) of the surveillance unit ( 10 ), and synthesis unit ( 4 ) connected to the surveillance units ( 10 ) to receive the state of the elevator landing door electrical contacts ( 11 , 12 ), and connected to the elevator control unit ( 5 ) to receive other information on the working order of the elevator, the synthesis unit ( 4 ) comprising means of determining ( 41 ) an operating state of the elevator based on the information received from the surveillance units ( 10 ) and the elevator control unit ( 5 ), the operating state being one of a plurality of predetermined operating states, and to actuate the signal devices ( 13 , 14 ) if the operating state of the elevator is determined to be critical to users of the elevator.