JP3916714B2 - Lock confirmation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a locking confirmation device for confirming locking of a building at a remote place.
[0002]
[Prior art]
For example, in a building such as a building containing a plurality of tenants, various people enter and exit through a common entrance. And in a building with this kind of common entrance / exit, for example, the locked state of the common entrance / exit is monitored from a remote place so that the common entrance / exit of the fence that is originally locked is unlocked and people do not inadvertently enter. The lock confirmation device shown in FIG. 2 or FIG. 3 is employed for crime prevention and security.
[0003]
The lock confirmation device of FIG. 2 has the most specifications, and detects the protrusion of the ridge by a mechanical switch. The mechanical switch 51 is provided in a door frame 54 formed with a receiving hole 53 into which the flange 52 is inserted, and an actuator 55 that moves when the flange 52 protrudes, and a micro switch that turns on and off as the actuator 55 moves. 56. A lamp 57 as a display device disposed in a remote place (for example, a management room or a security center) is connected to the micro switch 56 via a power source 58.
[0004]
In this locking confirmation device, when the flange 52 protrudes and fits into the receiving hole 53 by the locking operation, the actuator 55 is pushed by the flange 52. When the micro switch 56 is turned on by the movement of the actuator 55, the circuit is closed and power is supplied to the lamp 57. As a result, the lamp 57 is turned on, and locking can be confirmed.
[0005]
The locking confirmation device of FIG. 3 is one of the improved examples of the locking confirmation device of FIG. 2, and detects the protrusion of the ridge by a reed switch. In addition, the same number is attached | subjected and demonstrated to the same component as the locking confirmation apparatus of FIG.
[0006]
A magnet 61 is provided on the distal end surface of the collar 52 of the lock confirmation device. A reed switch 62 is provided facing the magnet 61 in the door frame 54 in which the receiving hole 53 into which the flange 52 is inserted is formed. The reed switch 62 is connected to a lamp 57 as a display device disposed in a remote place (for example, a management room or a security center) via a power source 58.
[0007]
In this locking confirmation device, when the collar 52 protrudes and fits into the receiving hole 53 by the locking operation, the magnet 61 provided on the distal end surface of the collar 52 approaches the reed switch 62. When the contact of the reed switch 62 is closed by the magnetism of the magnet 61, the circuit is closed and power is supplied to the lamp 57. As a result, the lamp 57 is turned on, and locking can be confirmed.
[0008]
[Problems to be solved by the invention]
However, in the locking confirmation device of FIG. 2, since the protrusion detection of the collar 52 is performed only under completely mechanical conditions, the collar 52 and the foreign object cannot be distinguished. For example, even when paper, resin, wood, metal, or the like presses the actuator 55, it is recognized as a hook 52, and there is a possibility that a foreign object other than the hook 52 may be mistaken for locking.
[0009]
Further, in the locking confirmation device of FIG. 3, it is possible to prevent misidentification due to a foreign matter made of a non-magnetic material such as paper, resin, wood, etc., but when a magnetic foreign matter other than the hook 52 approaches the reed switch 62, In response to the foreign matter, the contact of the reed switch 62 is closed and recognized as a flaw, which may be mistaken for locking.
[0010]
As described above, in any of the conventional lock confirmation devices shown in FIGS. 2 and 3, since the lock state due to the protrusion of the lock collar 52 is detected based on the mechanical condition, an object other than the collar 52 is recognized as the collar 52. There was a risk of mistaking it as a lock. Therefore, it was not possible to surely confirm important locks for crime prevention and security.
[0011]
Then, this invention is made | formed in view of the said problem, and it aims at providing the locking confirmation apparatus which can perform locking confirmation in a remote place reliably.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 includes a resonance circuit that is built in a lock cage and includes a first coil, a capacitor, and a resistor, and resonates at a specific frequency.
A second coil that is provided facing the receiving hole into which the flange is inserted, and that is electromagnetically coupled to the first coil of the resonance circuit when the flange is inserted into the receiving hole;
A plurality of oscillators connected to the second coil and set to different frequencies so that any one frequency is the same as the resonance frequency of the resonance circuit;
The hook is inserted into the receiving hole, the first coil of the resonance circuit is electromagnetically coupled to the second coil, and the lock is applied when the output of the oscillator having the same frequency as the resonance circuit changes. A discrimination circuit for outputting a signal;
And a display for displaying a lock according to a signal indicating that the lock is received from the discrimination circuit.
[0013]
In the present invention, a resonance circuit that resonates at a specific frequency is incorporated in the bag. The plurality of oscillators connected to the second coil in the door frame are set to different frequencies, and one of them is set to be the same as the resonance frequency of the resonance circuit in the bag. When the scissors are inserted into the receiving holes, the second coil connected to the plurality of oscillators and the first coil of the resonance circuit in the scissors are electromagnetically coupled, and signals with a plurality of frequencies are given to the scissors. .
[0014]
When only the output level of the oscillator having the same frequency as the resonance frequency of the resonance circuit changes due to the influence of the resonance circuit in the bag, the determination circuit determines that the bag is inserted into the receiving hole and locked, and a signal indicating that the lock has been obtained. Is output to the display unit, and the display unit displays the lock. On the other hand, if there is a change in the outputs of the oscillators of all frequencies or there is no change in the outputs of all the oscillators, it is determined that the object is not a bag. Thus, it is determined whether the object is a bag or an object other than a bag by changing the output value of the oscillator.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing an embodiment of a lock confirmation device according to the present invention.
[0016]
A resonance circuit 3 is built in the heel 2 provided on the lock door 1. The resonance circuit 3 includes a closed circuit in which a coil (first coil) L1, a capacitor C, and a resistor R are connected in series. The hook 2 protrudes by an actuator (not shown) at the time of locking, and is inserted into a strike receiving hole 5 attached to the door frame 4.
[0017]
A coil (second coil) L2 is disposed in the door frame 4 facing the receiving hole 5 into which the flange 2 is inserted, facing the coil L1 of the resonance circuit 3. One system of transmission lines 6 and 7 is connected to both ends of the coil L2. Between the transmission lines 6 and 7, a first coupler 8, a second coupler 9, and a third coupler 10 each composed of a pair of coils are connected in series.
[0018]
A first oscillator 11 that outputs a signal having a specific frequency f ₁ is connected to the first coupler 8. The signal of the frequency f ₁ of the first oscillator 11 is supplied to the coil L2 through the transmission lines 6 and 7.
[0019]
A second oscillator 12 that outputs a signal having a frequency f ₂ different from that of the first oscillator 11 is connected to the second coupler 9. The signal of the frequency f ₂ of the second oscillator 12 is supplied to the coil L 2 via the transmission lines 6 and 7, similarly to the first oscillator 11.
[0020]
A discrimination circuit 18 having a first filter 13, a second filter 14, a first level discriminator 15, a second level discriminator 16, and a logic circuit 17 is connected to the third coupler 10.
[0021]
The first filter 13 is connected to two transmission lines 19 and 20 extending from the third coupler 10. The first filter 13 allows only the signal of the frequency f ₁ out of the signals of the frequencies f ₁ and f ₂ induced from the transmission lines 6 and 7 to the transmission lines 19 and 20 via the third coupler 10. ing.
[0022]
Similar to the first filter 13, the second filter 14 is connected to two transmission lines 19 and 20 extending from the third coupler 10. The second filter 14 passes only the signal of the frequency f ₂ out of the signals of the frequencies f ₁ and f ₂ induced from the transmission lines 6 and 7 to the transmission lines 19 and 20 via the third coupler 10. ing.
[0023]
The first level discriminator 15 is connected to the output of the first filter 13 and compares the level of the signal of the frequency f ₁ that has passed through the first filter 13 with a preset reference level, and the level of the signal of the frequency f ₁ It is determined whether or not there has been a change. When the two levels match and there is no influence on the frequency f ₁ , an H level determination signal is output. In contrast, it changes the level of the frequency f ₁ of the signal, and outputs the L-level judgment signal when there is the influence on the frequency f _1.
[0024]
The second level discriminator 16 is connected to the output of the second filter 14, and similarly to the first level discriminator 15, the level of the signal of the frequency f ₂ that has passed through the second filter 14 is set to a preset reference level. By comparison, it is determined whether or not the level of the signal of frequency f ₂ has changed. Then, when both levels coincide with each other and there is no influence on the frequency f ₂ , an H level discrimination signal is output. In contrast, the level changes of the frequency f ₂ of the signal, and outputs the L-level judgment signal when there is the influence on the frequency f _2.
[0025]
The logic circuit 17 includes an inverting circuit 17a and a 2-input AND circuit 17b. The inverting circuit 17 a is connected to the output of the second level discriminator 16. The inverting circuit 17a inverts the discrimination signal from the second level discriminator 16 and inputs the signal to the AND circuit 17b.
[0026]
The AND circuit 17b has one input terminal connected to the first level discriminator 15, and the other input terminal connected to the inverting circuit 17a. The AND circuit 17b outputs a status signal indicating “locked” when an H level determination signal is input to both input terminals. On the other hand, when different levels of discrimination signals are input to both input terminals, a status signal indicating "unlocked" is output.
[0027]
A display 21 such as a lamp is connected to the output terminal of the AND circuit 17b. The indicator 21 is provided at a position away from the lock, such as a management room or a security center. When the status signal indicating “locked” is input from the AND circuit 17b, the indicator 21 lights up to indicate that the display 21 is locked. In addition, as long as the indicator 21 can confirm locking from the outside, you may perform not only the lighting display of a lamp but a character display. Further, the status signal from the AND circuit 17b can be used as a signal input for driving the security device in addition to lighting the display 21.
[0028]
Next, the operation of the lock confirmation device having the above configuration will be described. Here, the frequency of the signal sent from the first oscillator 11 to detect the insertion of the hook 2 into the receiving hole 5 is f ₁ , and the frequency of the signal sent from the second oscillator 12 is f _2. circuit 3 shall be resonant to frequencies f _2.
[0029]
A signal of frequency f ₁ from the first oscillator 11 and a signal of frequency f ₂ from the second oscillator 12 are applied to the coil L2 for detecting the insertion of the flange 2 into the receiving hole 5, respectively. When the flange 2 is inserted into the receiving hole 5 and approaches the coil L <b> 2 in the door frame 4, the coil L <b> 2 is electromagnetically coupled to the coil L <b> 1 of the resonance circuit 3.
[0030]
As a result, the signal of the frequency f ₂ of the second oscillator 12 is loaded by the resistor R of the resonance circuit 3 in the bag 2, the resistor R consumes energy of the frequency f ₂ , and the second oscillator 12 on the sending side The signal having the frequency f ₂ is affected, and the output e2 of the second oscillator 12 changes. That is, since the second oscillator 12 has an output impedance, the load resistance value decreases as the power consumption at the frequency f ₂ increases, and the output e2 of the second oscillator 12 decreases.
[0031]
On the other hand, since the signal of the frequency f ₁ of the first oscillator 11 does not become a load of the resistor R of the resonance circuit 3, the frequency f ₁ of the first oscillator 11 is not affected and the output e1 of the first oscillator 11 is not affected. Does not change.
[0032]
The output e1 of the first oscillator 11 and the output e2 of the second oscillator 12 are sent to the determination circuit 18 via the third coupler 10. In the discrimination circuit 18, only the signal having the frequency f ₁ passes through the first filter 13 and is input to the first level discriminator 15. Further, only the signal of frequency f ₂ passes through the second filter 14 and is input to the second level discriminator 16.
[0033]
Here, since there is no change in the signal of the frequency f ₁ input to the first level discriminator 15, an H level discrimination signal indicating that there is no influence on the frequency f ₁ is output from the first level discriminator 15. Is done. The H level determination signal is input to one input terminal of the AND circuit 17b.
[0034]
On the other hand, since there is a change in the signal of the frequency f ₂ input to the second level discriminator 16, an L level discrimination signal indicating that the frequency f ₂ is affected is output from the second level discriminator 16. Is output. The L level determination signal is inverted by the inverting circuit 17a and input to the other input terminal of the AND circuit 17b as the H level determination signal.
[0035]
As a result, an H level determination signal is input to both input terminals of the AND circuit 17b, and an H level state signal indicating "locked" is output. When the status signal indicating “locked” is output from the AND circuit 17b, the status signal is input to the display device 21 and the display device 21 is turned on.
[0036]
Accordingly, the flange 2 is inserted into the receiving hole 5 and the coil L2 and the coil L1 in the resonance circuit 3 are electromagnetically coupled, so that the frequency f ₁ of the first oscillator 11 is not affected, and the second oscillator 12 When the frequency f ₂ is affected, the display 21 is turned on and can be correctly determined to be locked.
[0037]
In the configuration shown in FIG. 1, the indicator 21 is lit by a status signal indicating “locked” which is the output of the AND circuit 17 b of the determination circuit 18, but the output of the AND circuit 17 b is used as another security device. It can also be used as a signal.
[0038]
Next, when the object other than the cage 2 is a magnetic material such as a metal, the signals of the frequencies f ₁ and f ₂ of both the oscillators 11 and 12 are both directly absorbed and consumed by the metal, and both are on the sending side. The oscillators 11 and 12 are affected, and the outputs e1 and e2 of the oscillators 11 and 12 change. Specifically, the levels of the outputs e1 and e2 of the oscillators 11 and 12 are lowered.
[0039]
The outputs e1 and e2 of the oscillators 11 and 12 are sent to the determination circuit 18 via the third coupler 10. In the discrimination circuit 18, only the signal having the frequency f ₁ passes through the first filter 13 and is input to the first level discriminator 15. Further, only the signal of frequency f ₂ passes through the second filter 14 and is input to the second level discriminator 16.
[0040]
Here, since there is a change in the signal of the frequency f ₁ input to the first level discriminator 15, an L level discrimination signal indicating that the frequency f ₁ is affected is output from the first level discriminator 15. Is done. The L level discrimination signal is input to one input terminal of the AND circuit 17b.
[0041]
Further, since the signal of the frequency f ₂ input to the second level discriminator 16 also changes, the second level discriminator 16 outputs an L level discrimination signal indicating that the frequency f ₂ is affected. The The L level determination signal is inverted by the inverting circuit 17a and input to the other input terminal of the AND circuit 17b as the H level determination signal.
[0042]
As a result, the L level determination signal and the H level determination signal are input to the AND circuit 17b. As a result, the AND circuit 17b outputs an L level state signal that does not indicate “locking”.
[0043]
Therefore, if the object is a magnetic material other than obex 2 state frequency f ₁ may be both significantly affected frequency f ₂ of the second oscillator 12 of the first oscillator 11, is from the discrimination circuit 18 indicating "locked" No signal is output, and it can be accurately determined that the object is not 閂 2.
[0044]
Next, when the object other than the jar 2 is an object other than metal (for example, resin, paper, wood, etc.), the signals of the frequencies f ₁ and f ₂ of both the oscillators 11 and 12 are the resistance R of the resonance circuit 3. And the frequencies f ₁ and f ₂ of both oscillators 11 and 12 on the sending side are not affected, and the outputs e1 and e2 of the oscillators 11 and 12 do not change.
[0045]
The outputs e1 and e2 of the oscillators 11 and 12 are sent to the determination circuit 18 via the third coupler 10. In the discrimination circuit 18, only the signal having the frequency f ₁ passes through the first filter 13 and is input to the first level discriminator 15. Further, only the signal of frequency f ₂ passes through the second filter 14 and is input to the second level discriminator 16.
[0046]
Here, since there is no change in the signal of the frequency f ₁ input to the first level discriminator 15, an H level discrimination signal indicating that there is no influence on the frequency f ₁ is output from the first level discriminator 15. Is done. The H level determination signal is input to one input terminal of the AND circuit 17b.
[0047]
Further, since there is no change in the signal of the frequency f ₂ input to the second level discriminator 16, an H level discrimination signal indicating that there is no influence on the frequency f ₂ is output from the second level discriminator 16. The The H level determination signal is inverted by the inverting circuit 17a and input to the other input terminal of the AND circuit 17b as the L level determination signal.
[0048]
As a result, an H level determination signal and an L level determination signal are input to the AND circuit 17b. As a result, the AND circuit 17b outputs an L level state signal that does not indicate “locking”.
[0049]
Therefore, when the object is a non-magnetic material other than the rod 2, neither the frequency f ₁ of the first oscillator 11 nor the frequency f ₂ of the second oscillator 12 is affected, and the “locking” is also performed from the determination circuit 18. The state signal shown is not output, and it can be accurately determined that the object is other than the eyelid 2.
[0050]
As described above, in the lock confirmation device, when any of the frequencies f ₁ and f ₂ of the oscillators 11 and 12 is affected by the 閂 2, the outputs e 1 and e 2 of the oscillators 11 and 12 are the internals of the oscillators 11 and 12. Varies with impedance. Therefore, it is possible to determine whether ｅ2 or other than 閂 2 by changing the values of the outputs e1 and e2 of the oscillators 11 and 12. As a result, the locked state (including the unlocked state) of the lock when the hook 2 is put in and out of the receiving hole 5 can be reliably confirmed even in a remote place without being mistaken as locked by a foreign object other than the hook 2 as in the past. can do.
[0051]
And the said locking confirmation apparatus receives the discrimination | determination signal which shows the locking or unlocking accompanying the entrance / exit of the cage | basket 2 to the receiving hole 5 as an electrical signal at a remote place, and this electrical signal is displayed on the indicator 21 or a security device. It can be used as a signal input for driving the camera, and can be applied to a device for crime prevention.
[0052]
By the way, if the configuration shown in the above embodiment (the configuration of FIG. 1) is adopted as one unit for each lock that needs to be monitored for the locked state, the locked state of each lock (for example, a control room, a security center, etc.) ) Can be centrally managed.
[0053]
In the above-described embodiment, the case where the two oscillators 10 and 11 are connected in series to the pair of transmission lines 6 and 7 has been illustrated and described. However, the two oscillators 10 and 11 are connected to the pair of transmission lines 6. , 7 can be connected in parallel to achieve the same effect.
[0054]
In the example shown in the figure, two oscillators are connected to the transmission lines 6 and 7, but each is set to a different frequency, and one of them is set to the same frequency as the resonance frequency of the resonance circuit 3. A plurality of (three or more) oscillators may be connected.
[0055]
Further, the discrimination circuit 18 is not limited to the configuration shown in the figure, and whether or not there is a change in the outputs (signals of the frequencies f ₁ and f ₂ ) for each of the oscillators 10 and 11 when the basket 2 enters and exits the receiving hole 5. What is necessary is just to be able to discriminate.
[0056]
【The invention's effect】
As is clear from the above description, according to the present invention, as in the prior art, the locked state by inserting the hook into the receiving hole is surely confirmed even in a remote place without being misidentified as locked by a foreign object other than the hook. be able to.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a locking confirmation device according to the present invention. FIG. 2 is a schematic configuration diagram of a conventional locking confirmation device using a mechanical switch. FIG. 3 is a conventional locking confirmation using a reed switch. Schematic configuration diagram of device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Door, 2 ... 閂, 3 ... Resonance circuit, 4 ... Door frame, 5 ... Receiving hole, 11 ... 1st oscillator, 12 ... 2nd oscillator, 18 ... Discrimination circuit, L1 ... 1st coil, L2 ... 1st 2 coils.

Claims (1)

A resonant circuit that is built into the lock cage and comprises a first coil, a capacitor, and a resistor, and resonates at a specific frequency;
A second coil that is provided facing the receiving hole into which the flange is inserted, and that is electromagnetically coupled to the first coil of the resonance circuit when the flange is inserted into the receiving hole;
A plurality of oscillators connected to the second coil and set to different frequencies so that any one frequency is the same as the resonance frequency of the resonance circuit;
The hook is inserted into the receiving hole, the first coil of the resonance circuit is electromagnetically coupled to the second coil, and the lock is applied when the output of the oscillator having the same frequency as the resonance circuit changes. A discrimination circuit for outputting a signal;
A lock confirmation device comprising: a display for displaying a lock according to a signal indicating that the lock is received from the discrimination circuit.

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