JPS6319905Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a crime prevention alarm device that includes an unlock alarm circuit that issues an unlock alarm when a locked lock is forcibly unlocked, and a reset circuit that resets the unlock alarm circuit. It is something.

Hitherto, as a reset circuit for this type of security alarm device, a hidden switch installed at an entrance or the like, or one in which the unlocking alarm circuit can be reset by operating a separate lock is known.

However, devices with a hidden switch no longer serve as crime prevention if the hidden switch is discovered, and devices with a separate lock require carrying an extra lock, which is inconvenient.

Therefore, the applicant previously proposed a device in which the unlocking alarm circuit could be reset by operating a switch a preset number of times, but with this device, a third party could press the switch. Sometimes, the unlock alarm circuit may be reset coincidentally with the set number of times, which is undesirable from a security standpoint.

This invention was devised in view of the above circumstances, and its purpose is to reset the unlocking alarm circuit by operating the switch a preset number of times, allowing a specific person to pass freely, but preventing a third party from passing through the door. To provide a crime prevention alarm device which issues an alarm at the time of intrusion and can prevent an accidental reset of an unlock alarm circuit by setting the number of switch operations in multiple digits.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagrammatic configuration explanatory diagram showing an embodiment of the present invention, and 1 ₁ , 1 ₂ , 1 ₃ , and 1 ₄ are locks provided on opening/closing parts of entrance doors, back doors, sliding doors, etc. These are first to fourth locking confirmation switches that detect locking/unlocking, and are turned off (open) and output an H signal when the lock is locked, and turned on (closed) and output an L signal when the lock is unlocked.

The output of each lock confirmation switch 1 is inputted via an inverter 2 to a first AND gate 3 and a chattering prevention circuit 4, via an OR gate 24 to a first hold circuit 5, and directly to a NOR gate 6. The outputs of are input to the first AND gate 3 and the NOR gate 6, respectively, and the output of the first AND gate 3 is input to the unlock alarm 8 via the second hold circuit 7.

9 is a main switch installed indoors, and when it is turned on, it outputs an L signal to the Noah gate 6 and also outputs the first and second
Input the reset signal _R1 to the hold circuits 5 and 7,
The output of the first NOR gate 6 is input to an unlock alarm 10.

Reference numeral 11 denotes a switch installed at the entrance etc., for example, an entrance doorway switch, which is a normally closed type push button switch that opens when operated, and is connected to the entrance doorway 12 installed inside the room.
The comparison circuit 14 counts the number of times the switch 11 is operated when connected to the circuit 14.
Enter.

The number of times the switch is operated, set by the first, second, and third number setting switches 15 ₁ , 15 ₂ , and 15 ₃ , is input to the comparison circuit 14 via the switching circuit 16 , and the comparison result is sent to the coincidence hold circuit 17 . At the same time, the coincidence hold circuit 17 outputs an L signal to the first AND gate 3 when the number of times the dial switch is operated matches the number of times the set dial switch is operated.
Output a signal.

18 is a reset switch that turns ON and OFF in conjunction with the doorknob, and is a normally closed switch that turns OFF (open) when the doorknob is moved to the door release side and outputs an H signal.The H signal is sent to the time check circuit 19. Check the length of the H signal time, and if it is long, operate the entrance chime 12 and send a reset signal to the counter 13, switching circuit 16, and coincidence hold circuit 17 via the OR gate 20.
Input R ₁ and R ₁ respectively. If it is short, the entrance chime 12' with a different tone is operated, and the switching signal R 2 is sent to the switching circuit 16 and coincidence hold circuit 17 via the second AND gate 21, and the switching signal R ₂ is sent via the delay circuit 22 and the OR gate 20. A reset signal _R1 is input to the counter 13.

A night set switch 23 is connected to the first hold circuit 5 via an OR gate 24 and inputs an H signal to the first hold circuit 5 when turned on.

FIG. 2 is a front view of the outdoor side of the entrance, in which the reset switch 18 interlocked with the knob a of door A is provided, as well as the entrance door switch 11, and b is a lock for locking and unlocking from the outdoor side. This is the keyhole.

FIG. 3 is a front view of the indoor side of the entrance, showing the locking confirmation switch 1, the number of times setting switches 15 ₁ , 15 ₂ , 15 ₃ , the entrance chime 12 , and the main switch, which are linked to the locking rod of the lock. 9. A night set switch 23, a reset switch 18 interlocked with a lock that is moved in and out by knob a, etc. are provided.

In addition, the number of times setting switches 15 ₁ , 15 ₂ , 15 ₃ ,
The entrance chime 12, the main switch 9, and the night set switch 23 may be installed at any or all of these locations.

Next, the operation will be described.

Unlocked confirmation operation When all the locks are locked, the first to fourth lock confirmation switches 1 ₁ to 1 ₄ open (OFF) and output an H signal, so the H signal is input to the NOR gate 6.

For this reason, even if the main switch 9 is turned on and an L signal is input to the NOR gate 6, the output will be the L signal, so the unlock alarm 10 will not operate.

At this time, if there is an unlocked lock, the lock confirmation switch 1 of that lock is closed (ON), and its output becomes an L signal, so that the L signal is input to the NOR gate 6. Further, the output of the first hold circuit 5 remains an L signal until the rising edge of the locking signal is detected.

Therefore, when the main switch 9 is operated, an L signal is output to the Noah gate 6, and the output of the Noah gate 6 becomes an H signal, which activates the unlock alarm 10 and detects that there is an unlocked lock. It can prevent theft due to forgetting.

Unlock Alarm Operation When all the locks are locked and each lock confirmation switch 1 is opened, an H signal is output and an L signal converted by the inverter 2 is input to the first AND gate 3.

On the other hand, since the main switch 9 is in the OFF state, the H signal from the lock confirmation switch 1 indicates that the first hold circuit 5 is in the reset state, and the first hold circuit 5 is not held and the first AND gate 3
Since the L signal is input to , and the H signal is input from the coincidence hold circuit 17 to the first AND gate 3, the first AND gate 3 does not output an H signal.

When one lock is unlocked in this state, the output is L.
The signal is converted by the inverter 2, and the H signal is input to the first AND gate 3. However, since the output of the first hold circuit 5 is held at the L signal, the L signal is input to the first AND gate 3. First
The AND gate 3 outputs an L signal and the unlock alarm 8 does not operate.

At this time, if the main switch 9 is turned on, the unlocked alarm 10 will operate in the same manner as described above, and a power supply check (determination as to whether the alarm circuit is normal or abnormal) can be made.

When the lock is locked again, an H signal is output, which is converted by the inverter 2 and an L signal is input to the first AND gate 3.The first hold circuit 5 outputs an H signal to the first AND gate 3 to unlock it. Alarm circuit is set. In other words, the unlocking alarm circuit is set by the rising signal at the time of locking.

In other words, the first hold circuit 5 becomes an R-S flip-flop, and when all the locks are locked, the unlock alarm circuit is not set without inputting the H signal to the first OR gate 3, and once the locks are unlocked, the unlock alarm circuit is not set. When the door is locked again, an H signal is output to the first AND gate 3 to set an unlock alarm circuit.

Therefore, when the user is indoors with all the locks locked, even if he or she unlocks one of the locks to go out, the unlock alarm 8 will not operate, which is preferable.

In addition, if the door is forcibly opened in the above-mentioned set state, the lock confirmation switch 1 turns on and outputs an L signal, which is converted by the inverter 2 to the first
Since the H signal is input to AND gate 3, the first
The AND gate 3 outputs an H signal and the unlock alarm 8 operates.

Since the H signal is held for a certain period of time by the second hold circuit 7, such as a timer, the unlocking alarm 8 operates for a certain period of time.

At this time, since the H signal is input from the first hold circuit 5 to the NOR gate 6, the main switch 9 is
Even if it is ON, the unlock alarm 10 does not operate.

Note that the unlock alarm 10 may also be used as the entrance chime 12, and the entrance chime 12 may be activated when the door is unlocked.

In this way, there is no need to install an extra bell or chime, and the wiring becomes simple. Also, by using the wiring path of the entrance door switch, you can easily install the main switch near the entrance, and you can check if the door is unlocked when you go out. It becomes convenient.

Further, when no one goes out such as at night, the unlock alarm circuit can be set by turning the night set switch 23 ON and OFF and switching and inputting the L-H signal to the first hold circuit 5.

Resetting operation of unlocking alarm circuit When the doorbell switch 11 is operated, the doorbell 12 is activated, and the counter 13 counts the number of operations. are compared by the comparator 14, and if they match, the match signal is sent to the match hold circuit 17.
is held and the L signal is input to the first AND gate 3.

Even if the lock is unlocked in this state, the 1st AND gate 3
does not output an H signal, so the unlock alarm 8 does not operate.

In other words, when the entrance door switch 11 is operated a preset number of times, the unlock alarm circuit is reset, and the unlock alarm 8 does not operate even if the lock is unlocked.

Therefore, the unlock alarm circuit can be reset using the entrance door switch 11, and there is no need to use a hidden switch or separate lock as in the past, so it is possible to reliably prevent the unlock alarm circuit from being reset by someone else. In addition, there is no need to carry extra locks, and accidents such as loss of locks do not occur.

Resetting the unlock alarm circuit and recovering from erroneous operation When the above operation occurs, the entrance door switch 11
If you accidentally operate the doorbell switch 11 a different number of times than the set number of times (for example, if someone else has operated the doorbell switch 11 several times, it will not be reset even if you operate it the set number of times). 18 is unlocked for a long time.

As a result, counter 1 passes through OR gate 20.
3, the switching circuit 16, and the coincidence hold circuit 17 are inputted with the reset signal _R1 to return to the initial state, so the unlocking alarm circuit can be reset by operating the entrance chime 11 a set number of times again.

At this time, since the entrance chime 12 operates, it is possible to sense that the reset switch 18 has been operated for a long time.

Operation to prevent the unlocking alarm circuit from being reset by another person The number setting switch 15 includes first, second, and third number setting switches 15 ₁ , 15 ₂ , and 15 ₃ and has a three-digit number of operations. It is configurable.

Therefore, first, when the entrance door switch 11 is operated N ₁ ' by the first setting number of operations N ₁ set by the first number setting switch 15 ₁ , the number of operations is
N ₁ ' is counted by the counter 13 and sent to the comparator circuit 1.
Sent to 4.

On the other hand, the first set number of operations N ₁ is sent from the switching circuit 16 to the comparison circuit 14, where N ₁ and N ₁ ' are compared.

After this, when the reset switch 18 is operated for a short time, the input of the comparator circuit 14 is checked and N ₁
When and N ₁ ' match, the match hold circuit 17
is held by the first hold circuit, and no L signal is output to the first AND gate 3. At the same time, the match signal of the comparison circuit 14 and the second AND gate 21
AND, input the switching signal R ₂ to the switching circuit 16 and the coincidence hold circuit 17, and send the second set number of operations N ₂ from the switching circuit 16 to the comparison circuit 14, and the second hold circuit of the coincidence hold circuit 17. is connected to the output side of the comparison circuit 14.

At the same time, the reset signal _R1 is input to the counter 13 via the delay circuit 22 and the OR gate 20 with a time delay, and the counter 13 is reset.

At this time, the entrance chime 12' with a different tone operates, and it is possible to sense that the reset switch 18 has been operated for a short time.

Then, turn the entrance door switch 11 again to the second
Perform the operation N ₂ ′ for the set number of operations N ₂ .

After that, when the reset switch 18 is operated for a short time, the input of the comparator circuit 14 is checked in the same manner as described above, and the coincidence signal is held in the second hold circuit of the coincidence hold circuit 17, and the first AND gate 3 is No signal is output. Along with that,
The third set number of operations _N3 is input from the switching circuit 16 to the comparison circuit 14, the output side of the comparison circuit 14 is connected to the third hold circuit of the coincidence hold circuit 17, and the counter 13 is reset with a time delay. Ru.

Later, when the entrance door switch 11 is operated again by the third set number of operations N _{3 '} , the coincidence signal is inputted to the third coincidence hold circuit of the coincidence hold circuit 17, and the first AND gate 3
An L signal is input to the lock, and the unlocking alarm circuit is reset.

In this way, the number of 3-digit setting operations N ₁ , N ₂ , N ₃
The unlock alarm circuit will not be reset unless the entrance door switch 11 is operated the same number of times as .
It is possible to prevent someone else from performing a reset operation.

The present invention is as described above, and the unlocking alarm circuit can be reset by operating the switch 11 a preset number of times.

Therefore, certain people can pass freely, but the unlock alarm circuit can be prevented from being reset by others, which is good for crime prevention as it will issue an alarm in the event of a third party's intrusion. It is convenient because it is not necessary.

In addition, since a reset signal is output when each set number of times set by the plurality of number of operation setters 15 and the number of times of operation of the entrance door switch 11 match each other, it is possible to ensure that the reset signal is not accidentally reset by someone else. It becomes a crime prevention alarm device that can prevent crime and has extremely high reliability.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention,
FIG. 2 is a front view of the entrance door from the outside, and FIG. 3 is a front view of the entrance door from the inside. 1 is a lock confirmation switch, 8 is an unlock alarm, 11 is a lock switch, 12 is a lock switch, 13 is a lock switch, 14 is a lock switch, 15 is a lock switch, 16 is a lock switch, 17 is a lock switch, 18 is a lock switch, 19 is a lock switch, 20 is a lock switch
indicates a switch, 13 indicates a counter, 14 indicates a comparison circuit,
Reference numeral 15 denotes an operation count setting device, 16 denotes a switching circuit, 17 denotes a coincidence hold circuit, and 18 denotes a reset switch.

Claims (1)

[Scope of utility model registration request] A lock confirmation switch 1 that detects whether the lock is locked or unlocked provided in each opening/closing part, an unlock alarm circuit that operates an unlock alarm 8 based on a detection signal from the lock confirmation switch 1, and the unlock alarm circuit. In a crime prevention alarm device equipped with a reset circuit, the reset circuit is connected to a counter 13 for counting the number of operations of the switch 11, a plurality of operation number setting devices 15 for setting the number of operations in advance, and each operation number setting device. 1
a switching circuit 16 that sequentially switches and outputs the set number of times from 5 to 5, a comparison circuit 14 that compares the set number of times outputted from the switching circuit 16 and the number of operations from the counter 13 and outputs a matching signal, and a matching signal from the comparing circuit 14; Coincidence hold circuit 1 that holds sequentially and outputs a reset signal when the last coincidence signal is input
7. A security alarm system comprising a reset switch 18 which sends a switching signal to the switching circuit 16 and the coincidence hold circuit 17 and a reset signal to the counter 13.