SU482779A1 - Code lock - Google Patents

Description

one

The invention relates to the field of automatic signaling, in particular, to the technique of protecting various objects from unauthorized persons.

Known code locks containing the decoding unit and the element "And connected to the Executive unit.

However, the codes of such locks can be visually identified by unauthorized persons watching the set of a secret code combination. Frequency code change is inconvenient for the user, and with long-term use of buttons carrying a code, traces may remain on the latter, distinguishing these buttons from the others, which can also lead to code disclosure.

In addition, code locks of this kind require the need to memorize the code, have increased dimensions, relative structural complexity, and reduced reliability due to the presence of a multi-contact switch.

The proposed code lock is distinguished by the fact that its decoding block is made on two logical nodes consisting of "AND-NOT. The inputs of the first elements “AND- NOT one of the logical nodes are connected via inverters to the input terminals of the code lock, and the inputs of the first elements“ AND-NOT of another logical node are connected to the input terminals of the code lock directly. The outputs of the first elements of the AND-NOT logical nodes are connected via the second elements of the AND-NOT to the inputs of the third elements of the AND-NOT, the outputs of which are connected to the corresponding inputs of the element I.

This improves the reliability of the combination lock. At the inputs of the decoding unit, the same type of elements are used, which are in the same electrical modes, with a large number of code variants that can be implemented in the lock. Thus, the code of the lock can not be decrypted either by iterating through the code variants or by measuring (dialing) its inputs.

In addition, in order to save electricity consumed by a code mark from a stationary power source, the power is turned on automatically only for the time it is inserted into the lock of a removable code key.

A combination lock can also work when there is no stationary power supply or when its tires are short-circuited. In this case, the power to the lock is supplied from a portable source (battery) through the contacts provided in the removable key. To prevent current from flowing from a non-portable source to short-circuited tires

A stationary source in the lock circuit is used diode.

FIG. 1 NEDSTSTAVV ENA functional lock code diagram; in fig. 2 is an electrical circuit of a code lock decoding unit.

The code lock contains a decoding unit 1, the element "AND 2, the executive unit 3, the power source 4, the input part 5 and the key 6.

Unit 1 consists of the first 7, second 8, third 9 elements “AND-NOT and inverters 10.

Works combination lock as follows.

When articulating the connectors of the key 6 and the input part 5, power supply voltage is applied to the lock power buses and logical signals are generated at all inputs of the AND-NOT 7 decoding unit logic elements.

When the key code corresponds to the lock code (i.e., the key is “your own”), 10-low potential is sent to all inverter inputs through this key, which corresponds to the supply of all AND-NOT b elements to one of the logic circuits of the logical unit signals. All inputs of the logic elements 7 of the other of the logic circuits remain unused. This is equivalent to the presence of high potentials on them, corresponding to the logic unit signals for these circuits. Each of the logic circuits implements the same function of conjunction, but in mutually opposite logical modes (corresponding to negative and positive logic). At the outputs of the decoding unit and, accordingly, at the inputs of the coincidence element appear the potentials of the resolution, causing a sequential operation of the coincidence element and the actuator, i.e., "opening the lock."

When using "someone else's key on some inputs of one or both logical

Circuits generate signals that do not correspond to the prescribed conjunction function. By acting on such signals, each of these nodes performs a function opposite to that prescribed, i.e., a disjunction function. This means that in the absence of at least one of the inputs of the low potential inverters 10, an inhibition potential is generated at the input of the decoding unit.

of the element “AND 2 and, therefore, of the execution unit 3. Similarly, for another logic circuit, supplying at least one of the inputs of its elements“ AND – HE 7 of low potential causes the output of the decoding

block the potential prohibition on the operation element matches.

When the key of someone else is keyed to the lock input device, an alarm signal can be activated.

Subject invention

A code lock containing a decoding unit and an And element connected to an execution unit, characterized in that, in order to increase the reliability of operation of a code lock, its decoding unit

made on two logical nodes, consisting of elements "AND-NOT, and the inputs of the first elements" AND-NOT one of the logical nodes are connected via inverters to the input terminals of the code lock, and the inputs

the first elements of the “NAND of another logical node are connected to the input terminals of the code lock directly; the outputs of the first elements of the N – N logical nodes are connected via the second elements of the N I

to the inputs of the third elements "AND-NOT, the outputs of which are connected to the corresponding inputs of the element" I.

SH

1 JT

E,

L

P

En

Vuz.2