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Key transmitter

Device that allows remote transfer of security conditions, obtained with the possession of a a key for a exchange switch or a lock in non-centralized devices. It consists of two parts that are completely equal to one another, one of which is located in the signal control room (Cabin) and the other in a small shelter or in boxes located near the switch or other secured mechanism. Each part is formed by a lock with a key; the movement of the bolt, which allows the extraction of the key, inside the lock is conditioned by the excitation of an electromagnet; the key, turning in the patch, causes the opening or closing of certain electrical contacts. When the tornout is secured by the transmitter, the key, extracted from the exchange stop, is inserted into the lock of the Key transmitter itself (in the part located near the tornout) and turned into the lock. This operation causes the electromagnet of the part of the transmitter located in the signal control station to be energized (key of this part already previously introduced and blocked) making it possible to extract the key of the cab complex. This is the same result that would be obtained if the key were physically transferred from the switch to the steering position. Consequently the extraction of a key in one of the two parts prevents the excitation of the electromagnet of the other, thus making the relative key remain locked. The Key transmitter is particularly useful when there are shifting frequently operated and located very far from maneuvering signals in the cabin

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