JPS5814545B2 - Electronic code lock for safe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic code lock for a safe, in which an unlock code is input by pressing a push button switch, and the safe is unlocked when the correct unlock code is input.

As a way to increase the safety of safes with electronic code locks,
In order to reduce the probability of unlocking due to coincidence of unlocking codes, it is possible to increase the number of digits of the unlocking code.

In order to further increase this safety, it would be better to make it possible to unlock the door only by using two different types of unlocking codes instead of using one type of unlocking code.

In this case, instead of having one manager memorize two types of unlock codes, it is possible to have two managers memorize different unlock codes, and also have them operate the lock separately. , which is desirable from the viewpoint of crime prevention.

Therefore, the present invention proposes an electronic code lock for a safe that emits an unlock signal only when two different correct unlock codes are input.

Further, the present invention simplifies the device by sharing common members such as an unlocking code input unit and a circuit for checking the unlocking codes when performing an unlocking operation using two unlocking codes. This invention proposes an electronic code lock that can effectively perform unlocking operations using two different unlock codes.

Furthermore, the present invention proposes an electronic code lock that can be switched as necessary to issue an unlock signal when one or both of two different unlock codes match.

Hereinafter, the present invention will be described in detail according to embodiments of the present invention shown in the accompanying drawings.

In the drawings, members having the same function are indicated by the same reference numerals.

First, in the code lock of the present invention, two managers A and B perform an unlocking operation using different 8-digit A unlock code and 8-digit B unlock code, respectively.

An unlocking signal is generated when the unlocking codes of both managers A and B match respective preset unlocking codes, or when either one of them matches.

FIG. 1 is a block diagram showing an example of an unlock code matching circuit used in the code lock of the present invention together with its peripheral circuits.

FIG. 2 is a block diagram showing an embodiment of the code lock of the present invention.

FIGS. 3 and 4 are block diagrams showing other embodiments of the code lock of the present invention.

FIG. 5 is a block diagram in the case where a switching section between the AND system and the OR system is added.

FIG. 6 is a circuit diagram showing a part of the code lock of the present invention in which switching between the AND system and the OR system is performed using a different configuration.

First, the block diagram shown in FIG. 1 will be explained.

IIA is a circuit that performs a verification operation for a set unlock code with respect to the A unlock code when performing an unlock operation using the A unlock code, and is called an A channel selection circuit.

Reference numeral 11B denotes a circuit that performs a verification operation on the set unlocking code with respect to the B unlocking code when performing an unlocking operation using the B unlocking code, and is called a B channel selection circuit.

The A channel selection circuit and the B channel selection circuit constitute a channel setting circuit.

20 is provided outside the vault, 1, 2,..., 9, 0
This is an unlocking code input section that has 10 push button switches for generating codes, and includes 10 output leads corresponding to the switches.

30 is an unlock code verification circuit that outputs a signal indicating a match when one of the preset A unlock code or B unlock code and the unlock code input to the unlock code input section 20 match. It is.

Further, this unlock code verification circuit 30 includes A unlock code setting circuits 311A, 312A,..., 318A, B unlock code setting circuits 311B, 312B,..., 318B, and A unlock code matching gates 321A, 322A,... , 328A, B unlock verification gates 321B, 322B,..., 328B, and unlock digits 331, 332,..., 338.
including.

However, it is preferable that the unlock shift section 33 is constructed of a shift register.

Individual A unlocking code setting circuits 311A, 312A,...,3
18A receives signals related to the input unlocking code from the 10 output lines of the unlocking code input section 20, and compares the signal with the one corresponding to the setting A unlocking code among the 10 output lines. The gates 321A, 322A, . . . , 328A are connected.

The A unlock verification gates 321A, 322A, ..., 328A are gates that open upon receiving the output of the A channel selection circuit 11A, and the corresponding A unlock code setting circuits 311A, 3
12A. ..., 318A are sent to the unlocking digits 331, 332, .

Individual B unlock code setting circuits 311B, 312B,...,3
18B receives a signal related to the input unlock code from the unlock code input section 200 and 10 output lines, and connects one of the 10 output lines to one corresponding to the set B unlock code and the B unlock verification game} 321B, 2322B, ..., 328B are connected.

B unlock verification game} 321B, 322B, ..., 328B are gates that open upon receiving the output of the B channel selection circuit 11B, and the corresponding B unlock code setting circuits 311B, 3
The signals from 12B, . . . , 318B are sent to the unlocking digits 331, 332, .

When the unlocking digit 331 receives a signal, it is carried up to the next unlocking digit 332, and then when the unlocking digit 332 receives a signal, it is carried up to the next unlocking digit 333, and this operation is repeated in sequence until the unlocking digit is finally unlocked. When the lock digit 338 receives the signal, the unlock shift unit 33 outputs a signal indicating that the input unlock code and the set unlock code match.

When the unlocking shift unit 33 outputs a signal, that is, when the unlocking code matching circuit 30 outputs an output, the unlocking code A or B is output.
This means that the unlocking code verification process has ended and the verification results match.

In this way, the unlock code matching circuit 30 outputs a signal indicating a match when the input unlock code matches the corresponding one of the preset A unlock code or the B unlock code. It is.

Next, the embodiment shown in FIG. 2 will be described.

A channel selection circuit 11A, B channel selection circuit 11B, unlocking code input section 20, and unlocking code matching circuit 3
The relationship with 0 is the same as in the first illustrated embodiment.

The A unlocking game 40A opens upon receiving the output of the A channel selection circuit 11A, and allows the signal from the unlocking code verification circuit 30 to pass therethrough.

Also, B unlock game} 40B is the B channel selection circuit 11
When it receives the output from B, it opens and allows the signal from the unlock code matching circuit 30 to pass through.

The A signal holding circuit 50A receives the A signal from the A unlock gate 40A.
This is a circuit that receives a signal and continues to output a signal corresponding to the A signal for a certain period of time.

The B signal holding circuit 50B is a circuit that receives the B signal from the B unlock game 40B and continues to output a signal corresponding to the B signal for a certain period of time. Indicates that there was no matching match for the unlock code, or that there was no matching match for the B unlock code.

The signal holding circuit 50 is a combination of an A signal holding circuit 50A and a B signal holding circuit 50B, and the signal holding circuit 50 includes a signal holding circuit 50A and a B signal holding circuit 50B. It is sufficient to hold either one of them.

That is, when inputting the A unlocking code first and inputting the B unlocking code later, it is sufficient to hold the A signal of the A unlocking gate 40A until the inputting operation of the B unlocking code is completed.
It is not necessary to hold the B signal from the B unlock gate 40B.

The final stage gate 60 emits an unlock signal when it receives both the A signal and the B signal, and is logically an AND gate.

However, an OR gate is provided in parallel with the AND gate,
If the output of the AND gate and the output of the OR gate are switched to output the unlock signal, the switch can be made so that the unlock signal is output when both or one of the two unlock codes match. be able to.

The operation of the second illustrated embodiment will be explained.

First, when the manager A performs an unlocking operation using the unlock code A, when the A channel selection circuit 11A is activated, the part of the electronic code lock of the present invention related to the member for the unlock code A becomes activated, and The gate of unlock game 40A opens.

Next, when the correct A unlock code is input from the unlock code input section 20, the unlock code verification circuit 30 outputs a signal indicating that the input unlock code is correct, and the A signal from the A unlock game 40A is The A signal holding circuit 50A continues to supply the A signal to one input of the final stage gate 60.

Even if the unlock code matching circuit 30 outputs the signal here,
The B unlock gate 40B is open and therefore does not output the B signal.

Next, when the B manager uses the B unlock code to perform an unlock operation, the channel setting circuit sets the B channel, that is, the operation of the A channel selection circuit 11A is switched to the operation of the B channel selection circuit 11B.

Then, the part of the electronic code lock of the present invention relating to the member for the B unlocking code becomes activated, and the gate of the B unlocking game 40B opens.

Next, when the correct B unlock code is input from the unlock code input section 20, the unlock code matching circuit 30 outputs a signal in the same way as in the case of the A unlock code, and the B signal from the B unlock game 40B is It is applied to another input of the final stage gate 60.

Here, since the A signal is also applied to the final stage gate 60, the final stage gate 60 issues an unlock signal.

This unlocking signal is amplified and causes a current to flow through a solenoid (not shown) or the like, thereby shifting the locking device (not shown) from a locked state to an unlocked state.

Furthermore, if an electric member such as a motor that opens and closes the safe door is driven by this unlocking signal, it becomes extremely convenient in combination with the remote operability of the electronic code lock.

Furthermore, since the signal holding time of the signal holding circuit 50 is set constant, even if the second person enters the correct unlocking code, the unlocking signal will not be generated after this certain period of time has elapsed, which is a safety concern. Sufficiently secured.

Next, an embodiment of the electronic code lock of the present invention shown in FIG. 3 will be described.

The third illustrated embodiment is substantially the same as the second illustrated embodiment, except that the signal holding circuit 50 in the second illustrated embodiment is configured in a different manner.

The retention time control circuit 52 is connected to the A channel selection circuit 11A.
Alternatively, it is a circuit that receives the output of the B channel selection circuit 11B and continuously emits an output signal for a certain period of time while receiving this output and after it ceases to receive this output.

The continuous generation time of the output signal in the holding time control circuit 52 can be adjusted from the outside.

When the A signal gate circuit 51A receives the A signal from the A unlocking game 40A while receiving the output signal from the holding time control circuit 52, it outputs a signal corresponding to the A signal, and then A unlocks the A signal. This circuit continues to send a signal corresponding to the A signal to the final stage gate 60 as long as it is receiving the output signal from the holding time control circuit 52 even if the A signal from the gate 40A is cut off.

When the B signal gate circuit 51B receives the B signal from the B unlocking gate 40B while receiving the output signal from the holding time control circuit 52, it outputs a signal corresponding to the B signal, and then the B unlocking gate circuit 51B outputs a signal corresponding to the B signal. Even if the B signal from the gate 40B is cut off, this circuit continues to send a signal corresponding to the B signal to the final stage gate 60 as long as it receives the output signal from the holding time control circuit 52.

The operation of the third illustrated embodiment will now be discussed.

When the input operation of the correct A unlocking code by the A manager is completed, the A signal is generated from the A unlocking gate 40A.

Further, in this case, the holding time control circuit 52 receives the output of the A channel selection circuit 11A, thereby changing the output signal to A.
It is supplied to the signal gate circuit 51A and the B signal gate circuit 51B.

As a result, the A signal gate circuit 51A and the final stage gate 60
A signal corresponding to the A signal is sent out.

Next, in order to perform an unlock operation using the B unlock code, the B manager stops the operation of the A channel selection circuit 11A, and
The channel selection circuit 11B is activated.

During this switching, the retention time control circuit 52 is designed to continue generating the output signal for a certain short period of time even if the input signal is temporarily lost.

Therefore, during the short time after the A signal is no longer emitted from the A unlock game 40A, the B channel selection circuit 11B
As long as the A signal gate circuit 5iA operates, the A signal gate circuit 5iA continues to send a signal corresponding to the A signal to the final stage gate 60.

Then, when the B unlocking operation using the correct B unlocking code is completed, the B unlocking game 40B outputs the B signal, and the B signal gate circuit 51B receives the output signal from the holding time control circuit 52 and responds accordingly to the B signal. The signal continues to be sent to the final stage gate 60.

When the final stage gate 60 receives a signal corresponding to the A signal and a signal corresponding to the B signal, it issues an unlocking signal.

When manager B completes the unlocking operation in this way, manager B stops the operation of the B channel selection circuit 11B.

Then, after a short period of time, the generation of the output signal from the holding time control circuit 52 stops, and both the signal corresponding to the A signal from the A signal gate circuit 51A and the signal corresponding to the B signal from the B signal gate circuit 51B are in the output stage. The signal is no longer supplied to the gate 60, and the final stage gate 60 no longer outputs the unlock signal.

Next, the embodiment shown in FIG. 4 will be described.

The fourth illustrated embodiment is different from the third illustrated embodiment in that an interlock circuit 12 is added to the rear stage of the A channel selection circuit 11A and the B channel selection circuit 11B for locking signals indicating their operating states.

This interlock circuit 12 maintains the signal state for a certain period of time after operating one of the A channel selection circuit 11A and the B channel selection circuit 11B, and during that time even if the other channel selection circuit is operated, the signal state will not change. It is designed so that it will not happen.

Therefore, the unlocking operation once started will not be disturbed by erroneous operation of the channel selection circuit.

Next, the embodiment shown in FIG. 5 will be described.

The AND method is a method in which an unlock signal is issued only when both the A unlock code and the B unlock code match.
A method of issuing an unlock signal when either the A unlock code or the B unlock code is matched will be referred to as the OR method.

FIG. 5 shows an embodiment of both types of switching circuit.

However, it is assumed that the final stage gate 60 in FIG. 5 logically performs only an AND function.

A single-pole double-throw first switch γ1 of a switching reservoir is provided between the unlocking code matching circuit 30 and the A unlocking gate 40A and the B unlocking gate 40B, and its common pole is connected to the unlocking code matching circuit 3.
0, and one terminal, that is, the D terminal, is connected to the connection point between the input of the A unlocking gate 40A and the input of the B unlocking gate 40B.

Also, one terminal of the second switch 72 for switching, that is, the D terminal, is connected to the output of the final stage gate 60, and the remaining terminal, the S terminal, is connected to the remaining terminal, the S terminal of the first switch 71. The unlocking signal is output from the common pole to subsequent circuits, devices, etc.

Unfortunately, if the output of the unlock code matching circuit 30 and the output of the final stage gate 60 have different polarities, the S of the first switch 71
An inverter γ3 is connected between the terminal and the S terminal of the second switch 72.
It is recommended to insert .

Here, the first switch 71 and the second switch 72 are designed to be interlocked, and when one common pole is connected to the S terminal or the D terminal, the other common pole is also connected to the S terminal or the D terminal, respectively. It is supposed to connect.

If the AND method is used, the first switch 7
Both the first switch 71 and the second switch 72 may be switched to the D terminal, and if it is desired to operate in the OR method, the first switch 71 and the second switch 72 may both be switched to the S terminal.

FIG. 5 shows a case where the OR method is adopted.

Next, FIG. 6, which shows another embodiment of switching between the AND method and the OR method, will be described.

FIG. 6 shows the A signal gate circuits 51A and B in FIG.
It is a diagram showing a signal gate circuit 51B and a final stage gate in more detail.

The final stage gate 60 receives two inputs in parallel.
It has a D gate 601 and a NOR gate 602, and a single-pole double-throw switch 74 that switches the output signals of these two gates.In other words, one terminal of the switch 74 is connected to the output of the NAND gate 601, and the other terminal is connected to the output of the NAND gate 601. is connected to the output of NOR gate 602.

Then, an unlock signal 9 is output from the common terminal of the switch 74.

Here, if it is desired to operate in an AND manner, the switch 74 may be connected to the NAND gate 601, and if it is desired to be operated in an OR manner, it may be connected to the NOR gate 602.

As described above, the present invention has the following effects.

Since it is possible to have two people manage two different unlocking codes and perform the unlocking operations separately, the possibility of the safe being broken into by an internal thief is drastically reduced.

Further, it is convenient because the AND method and the OR method can be freely changed as necessary.

Furthermore, while performing the verification operation for each of the two different unlocking codes, by performing the unlocking operation in chronological order, a part of the circuit can be shared, making the entire electronic code lock inexpensive and simple. It can be configured as follows.

Furthermore, since there is an interlock circuit, the unlocking operations of Manager A and Manager B will not be interfered with even if the channel selection circuit is erroneously operated.

In addition, if the holding time of the signal holding circuit is set to a short time, one of the managers will forget that he or she did the unlocking operation.
It is possible to effectively prevent the problem of the lock being unlocked by the other manager's unlocking operation after a long period of time has elapsed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of an unlock code matching circuit used in the electronic code lock of the present invention together with its peripheral circuits, FIG. 2 is a block diagram showing an embodiment of the code lock of the present invention, and FIGS. FIG. 4 is a block diagram showing other embodiments of the code lock of the present invention, FIG. 5 is a block diagram showing a configuration in which a member for switching between the AND system and the OR system is added, and FIG. It is a circuit diagram showing another example of switching between the method and the OR method. Lock code verification circuit, 40A...A unlocking gate, 40B...B unlocking gate, 50...Signal holding circuit, 50
A...A signal holding circuit, 50B...B signal holding circuit, 51A
...A signal gate circuit, 51B...B signal gate circuit, 52
...Holding time control circuit, 60... Final stage gate, 71... First switch, 72... Second switch.

Claims (1)

[Claims] 1. An electronic code lock that generates an unlock signal by applying two different unlock codes, A unlock code and B unlock code,
An A channel selection circuit that activates a member associated with the A unlock code when an unlock operation is performed using the A unlock code, and a B channel selection circuit that activates a member associated with the B unlock code when an unlock operation is performed using the B unlock code. When the unlock code input section inputs the unlock code by external operation, and the unlock code input from the unlock code input section matches the corresponding one of the two preset unlock codes. An unlocking code verification circuit that outputs an output to the A channel selection circuit, an A unlocking gate that generates an A signal when receiving the output of the unlocking code verification circuit under the regulation of the A channel selection circuit, and an unlocking gate that generates an A signal under the regulation of the B channel selection circuit. A B unlock gate that generates a B signal upon receiving the output of the code matching circuit, a signal holding circuit that holds and outputs at least one of the A signal and the B signal for a certain period of time, and at least one of the A signal and the B signal. An electronic code lock for a safe, characterized by comprising a final stage gate that issues an unlocking signal when receiving either signal. 2. The electronic code lock for a safe according to claim 1, wherein the final stage gate is composed of an AND gate, and receives both the A signal and the B signal and issues an unlocking signal. 3. The final stage gate includes an AND gate and an OR gate that receive two inputs in parallel, one terminal connected to the output of the AND gate, and the other terminal connected to the output of the OR gate. 2. The electronic code lock for a safe according to claim 1, further comprising a switch member that outputs an unlock code from a common pole. 4. The signal holding circuit is at least one of the A signal holding circuit that holds the A signal for a certain period of time and continues to generate an output, and the B signal holding circuit that holds the B signal for a certain period of time and continues to generate an output.
The electronic code lock for a safe according to any one of claims 1 to 3, characterized in that the electronic code lock includes: 5 The signal holding circuit has a holding time control circuit which outputs an output for a certain period of time after receiving the output of the A channel selection circuit and the output of the B channel selection circuit. Claim 1 characterized in that it includes an A signal gate circuit that continues to output an output when receiving the B signal, and a B signal gate circuit that continues to output an output once it receives the B signal as long as it receives the output of the retention time control circuit. The electronic code lock for a safe according to any one of Items 1 to 3. 6. The electronic safe according to any one of claims 1 to 5, characterized by having an interlock circuit that locks a signal indicating the operation of the A channel selection circuit and the B channel selection circuit. Code lock. 7. The electronic code lock for a safe according to any one of claims 1 to 6, characterized by comprising an electric member for opening the safe door that is activated by an unlocking signal. 8 In an electronic code lock that generates an unlock signal by applying two different unlock codes, A unlock code and B unlock code,
An A channel selection circuit that activates a member associated with the A unlock code when an unlock operation is performed using the A unlock code, and a B channel selection circuit that activates a member associated with the B unlock code when an unlock operation is performed using the B unlock code. When the unlock code input section inputs the unlock code by external operation, and the unlock code input from the unlock code input section matches the corresponding one of the two preset unlock codes. An unlocking code verification circuit that outputs an output to the A channel selection circuit, an A unlocking gate that generates an A signal when receiving the output of the unlocking code verification circuit under the regulation of the A channel selection circuit, and an unlocking gate that generates an A signal under the regulation of the B channel selection circuit. A B unlock gate that generates a B signal upon receiving the output of the code matching circuit, a signal holding circuit that holds and outputs at least one of the A signal and the B signal for a certain period of time, and receives the A signal and the B signal. and a final stage gate that emits an output signal, and a common pole connected to the output of the unlocking code matching circuit, and one of at least two terminals
A first switch having one terminal connected to the connection point between the input of the A unlocking gate and the input of the B unlocking gate, and one terminal of the at least two terminals connected to the output of the final stage gate, and another An electronic code lock for a safe, comprising: a second switch which connects a terminal of the first switch to another terminal of the first switch and takes out an unlocking signal from a common pole. 9 The signal holding circuit is at least one of the A signal holding circuit that holds the A signal for a certain period of time and continues to generate an output, and the B signal holding circuit that holds the B signal for a certain period of time and continues to generate an output.
The electronic code lock for a safe according to claim 8, characterized in that the electronic code lock includes: 10 The signal holding circuit includes a holding time control circuit that outputs an output for a certain period of time after receiving the output of the A channel selection circuit or the output of the B channel selection circuit, and a holding time control circuit that outputs an output for a certain period of time after receiving the output of the A channel selection circuit or the output of the B channel selection circuit, and once receiving the A signal as long as it receives the output of the holding time control circuit. The A signal gate circuit continues to emit an output, and the B signal continues to emit an output once it receives the B signal as long as it receives the output from the retention time control circuit.
The electronic code lock for a safe according to claim 8, characterized in that it includes a signal gate circuit. 11 Claims 8 to 10, characterized by having an interlock circuit that locks signals indicating the operation of the A channel selection circuit and the B channel selection circuit.
An electronic code lock for a safe as described in any one of the paragraphs. 12. The electronic code lock for a safe according to any one of claims 8 to 11, characterized by comprising an electric member for opening the safe door that is activated by an unlocking signal.