FIELD: transportation.
SUBSTANCE: creation of safety device (14) to be mounted nearby the auxiliary unlocking mechanism of the lift door to prevent actuating the auxiliary unlocking mechanism in normal operating conditions Safety device (14) contains an excitation circuit reacting to changes in operating conditions of the lift systems, and can contain additionally a protecting element (28) made to move initiated by the excitation circuit between the first position, preventing insertion of a key through a keyhole in normal operating conditions, and the second position allowing the key insertion in extreme operating conditions. So, the key can be inserted into the keyhole to actuate the unlocking head of the auxiliary unlocking mechanism to unlock the lift doors in extreme operating conditions.
EFFECT: higher reliability of preventing unauthorized access to the lift well.
11 cl, 16 dwg
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