SU771315A1 - Coded lock control device - Google Patents

Description

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The invention relates to the field of security automation.

A control device for a combination lock, a series-connected coding unit, a switching unit and an AND circuit whose output is connected to the input of the actuator 1, is known.

A disadvantage of the known device is the low level of reliability due to the possibility of opening the lock by simultaneously turning on all the buttons constituting the code combination.

The purpose of the present invention is to increase scoria.

The goal is achieved by the fact that the code lock control device has a selector-multiplexer, an RS flip-flop and a counter, the outputs of which are connected to the control inputs of the selector-multiplexer and circuit inputs NI, the output of the switching unit is connected to the information inputs of the multiplexer selector, and its the output is connected to the 5-input trigger, the R-input of which is connected to the output of the coding block, and the output of the RS flip-flop is connected to one of the counter inputs.

to the other input of which is connected the output of the switching unit.

The drawing shows a combination lock control device.

5 The control unit comprises, in series, a coding unit 1 and a switching unit 2, circuit 3, the output of which is connected to the input of the actuator 4,

10 selector multiplexer 5, whose information inputs are connected to the excitation outputs of switching unit 2, RS flip-flop 6, whose input is connected to the output of selector 15 of multiplexer 5, and input Rc to an additional output of encoding unit 1, and counter 7, whose outputs are connected with the control inputs of the selector-multiplexer 5, and the input

The counting 20 and the reset input are connected to the output of the RS flip-flop b and the output of the switching unit 2 of the switching, respectively, and the inputs of the circuit 3 are connected to the outputs of the counter 7 and the last excitation output of the switching unit 2.

The control device operates as follows.

It is necessary to open the lock.

30 dial the key code combination on the buttons of the coding unit 1, which is preset on the dial pad of the switching unit 2. Before starting the set of key code combinations, the counter 7 is in the initial zero state of the scientific research institute, and in this state of the counter 7, the zero excitation output of the switching unit 2 is connected to the input S of the RS flip-flop 6 via the selector-multiplexer 5. The signal at the zero output of the switching unit 2 appears only when the first digit of the key code combination is correctly entered. This signal affects the S input of the RS flip-flop 6 and switches it to state 1. When the button-block 1 of the coding corresponding to the first digit of the key code combination is turned off, the RS-flip-flop 6 is transferred from the auxiliary output of the coding block 1 to the state O. At the output of the RS flip-flop b, a signal is generated that switches the counter 7 to the next (first) state. In the first state of the counter 7, the first excitation output of the switching unit 2 is connected to the input S of the RS flip-flop 6 via the selector-multiplexer 5. When the next digit of the key code combination is correctly entered, the signal from the first excitation output of the switching unit 2 through the selector-multiplexer 5 acts on the input S of the Trigger 6, switching it to state 1. When the button corresponding to the second digit of the key combination is connected, the output RS signal -trigger 6, the counter 7 switches to the next state, connected to the S input of the RS flip-flop b, the next excitation output of the switching unit 2. The correct set of all subsequent digits of the key code combination is done in the same way. Before dialing the last digit of the key code combination, the counter 7 is in the state decoded by the IZ circuit. With the correct set of the last digit at the output of the circuit MJ And 3, a signal is generated that the actuator 4 carries out to open the code lock. When the button corresponding to the last digit of the key code combination is turned off, the counter 7 goes to the original zero state, i.e. the combination lock is being prepared for the next opening. If any digit of the code combination is incorrectly entered, a sigissh appears at the output of the blanking of the switching unit 2, by which the counter 7 is set to the initial zero state. At the same time, in order to open the lock, it is necessary to carry out a set of a key code combination with the start.

Claims (1)

1. USSR author's certificate 511614, cl. G 08 B 21/01, 1974. f b-j f. .four.- 1 i I I t 4 q "". "4 0-OY O