CODE LOCK FOR CONTAINERS Russian patent published in 2004 - IPC

FIELD: closing devices. SUBSTANCE: the code lock for containers has a code device on the container including ferreed contacts connected to the control circuit of the electromechanical closing device, magnetic key made in the form of a block of magnets isolated from one another, the master oscillator, modulating code generator, phase manipulator and the power amplifier via the make contacts of the alarm system are connected to a power supply source, on the control station series-connected receiving antenna, high-frequency amplifier, phase doubler, phase detector, whose second input is connected to the output of a narrow-band filter, and a detection unit, as well as a phase scale-of-two circuit connected to the output of the phase doubler. On the control station the lock is provided with a frequency detector, flip-flop and a double balance switch, series-connected to the output of the phase scale-of-two circuit are the frequency detector, flip-flop and the double balance switch, whose second input is connected to the output of the phase scale-of-two circuit, and the output is connected to the narrow-band filter. EFFECT: enhanced noise immunity. 3 dwg