JP3403148B2 - Double lock device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a double lock device,
In particular, the present invention relates to a double lock device that can lock and unlock the first and second locks with a single key.

[0002]

2. Description of the Related Art Usually, a door that can be locked and unlocked by a key is attached to a front door of a home for crime prevention. Conventionally, a plurality of locks are attached to one door in order to enhance safety.

However, when a plurality of locks are attached, there are a plurality of keys corresponding to the locks,
Storage at home and possession when going out become complicated. Also, when locking and unlocking, the key must be replaced and operated. Moreover, each time, it is necessary to judge which key corresponds to which lock.

Therefore, the attachment of a plurality of locks must accept the complexity and inconvenience in exchange for improved safety.

[0005]

Problems to be Solved by the Invention
Japanese Patent No. 9 discloses a lock device capable of continuously operating locking and unlocking of a bar and locking or unlocking inside a door with one key. According to this, a single key is enough. However, the lock inside the door in this device is a lock with a principle similar to a chain lock, and when locking the lock, it is necessary to manually engage the piece at the free end of the arm that replaces the chain with the slide groove inside the upper part of the door. There is
In a strict sense, it cannot be said that the double locking operation can be performed by only one key operation, and the locking operation is complicated.
Also, if a legitimate key is used due to theft or loss,
Even a forged key may be unlocked relatively easily if the key shapes match.

In addition, when the door is forcibly opened without a normal unlocking operation, it is preferable that a person concerned or a neighborhood can recognize the occurrence of such an abnormal situation by an alarm or the like.

The present invention has been made in such a background, and an object thereof is to lock / unlock a plurality of locks by using a single key, and for one of the locks. Is to provide a double lock device which requires a key operation according to a personal identification number.

Another object of the present invention is to provide a double lock device which can be constructed by adding a second lock to an existing lock device.

Still another object of the present invention is to provide a double lock device which can generate an alarm when a door is opened without a proper procedure.

[0010]

A double lock device according to the present invention is a double lock device in which a second lock is added to a first lock that is mechanically locked / unlocked by the operation of a single key. A locking device, which is electrically controlled by operating the single key.
The second lock to be unlocked, a secret code setting means for setting a secret code in advance, and a rotation operation of the single key in a state where the single key is inserted into the first lock are detected. A first sensor, a counting unit that counts the number of detections of the first sensor, and a locking operation by the first key in the unlocked state of the second lock, and locks the second lock, Control means for comparing the count value of the counting means with the operation of the single key in the locked state of the second lock with the secret code number, and unlocking the second lock when both match. It is characterized by having.

With this configuration, it is possible to lock / unlock a plurality of locks using a single key. In particular, since the locking operation of the second lock is performed using the first locking operation, the locking operation is no different from the conventional locking device for the user. On the other hand, the unlocking operation of the second lock requires the trouble of inputting the personal identification number, but it may occur when a legitimate key is used due to theft or loss, or when a delicate forged key is used. However, it is highly safe because it cannot be unlocked unless the passwords match. Moreover, since it can be configured by adding the second lock to the existing lock device, the installation cost can be suppressed.

The double lock device is associated with, for example, first storage means for non-volatilely storing a multi-digit numerical value as the personal identification number set by the personal identification number setting means, and operation of the single key. A digit shift means for shifting the digit of the count value of the counting means, and a second value for storing the count value of each digit
Storage means, and the control means has a comparison means for comparing the count values of each digit stored in the first and second storage means.

Further, the first and second locks are installed on a door, and abnormality detecting means for detecting that the door is opened in the locked state of the second lock, and the abnormality detecting means. It is preferable to further include means for issuing an alarm when an abnormality is detected by

Further, means for detecting a decrease in operating voltage of the second lock and the control means, and storage means for holding the current locked / unlocked state of the second lock as flag information in a nonvolatile manner. Further, the control means forcibly unlocks the second lock if the second lock is in a locked state when the operating voltage is detected, and the flag retained in the storage means when the operating voltage is restored. It is preferable to restore the locked / unlocked state of the second lock to the original state based on the information. This makes it possible to deal with battery exhaustion, power failure, and the like.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a front view (b), a plan sectional view (a) and a side sectional view (c) of a door to which the present invention is applied. The door 11 is rotatable by a hinge 12 so that the frame 18 can rotate.
Is attached to. The locking piece 19 that is normally protruding from the open side of the door 11 can be retracted inward against the spring force by an external force. The locking piece 19 engages with the opening 17 of the frame 18 in a protruding state. The locking piece 19 retracts in association with the rotation of the knob 13 and separates from the opening 17 to open the door 11. Knob 13
There is a key hole 50 in the vicinity of, and by inserting the key 51 into the key hole and rotating it, the rod-shaped lock piece 43 is moved to the door 11
Door frame 1 by protruding / retracting from inside
Locking / unlocking can be performed with the corresponding opening 42 on the eight side. A first lock device configured by such a key 51, the lock piece 43, and a lock mechanism (not shown) that transmits the rotational movement of the key 51 to the lock piece 43.
The (lock) 40 has the same configuration as that conventionally known.

In the present embodiment, the second lock device (lock) 20, the operation panel 80, the count sensor 41 for counting the number of times the key 51 is operated, the shift sensor 15 for shifting the digit when the personal identification number is input, and the like. To provide. Count sensor 41
Are arranged in the opening 42.

The lock device 20 comprises a main body portion 21, a lock piece 22 which can project and retract from the main body portion 21, and a fastener 24 with which the lock piece 22 is engaged. In the illustrated example, the main body portion 21 is provided on the door frame 18 side, and the fastener 2
Although 4 is provided on the door 11 side, it may be reversed. A detailed configuration example of the lock device 20 will be described in detail later.

The operation panel 80 of the lock device 20 is installed at a predetermined position indoors, and performs setting of a personal identification number, which will be described later, various operations and a predetermined display for the user. The operation panel 80 may be provided on the main body 21 of the lock device 20. In that case, the lock device 20 and the operation panel 80
There is no need to lay out electrical wiring between and. However, the installation position of the lock device 20 needs to be set to a height that the user can normally use.

As best shown in FIG. 1 (c),
A switch operating member 36 is installed inside the upper portion of the door 11. In the closed state of the door 11, a shift sensor 15 and a door opening sensor 35 are installed on the inner wall of the door frame 11 above the door 11 corresponding to the switch operating member 36. Both sensors are push switches (or proximity sensors) that are normally in the protruding state (OFF state).
Normally, the door 11 can be moved back and forth within a slight distance d even in the closed state, and when the door 11 is pushed, the push button portion of the shift sensor 15 is operated by the switch operating member 36.
ON by being pressed by the slope of the angled slope 37 at the tip of the
Then, when the pressure on the door 11 is released, the push button portion of the shift sensor 15 is returned to the projecting position by its spring force, so that the positional relationship among the components is set. Door open sensor 3
In the process of opening the door 11 from the closed state, the angled inclined portion 37 of the switch operating member 36 passes under the sensor 35, and at that time, the push button portion is pressed to turn on 5.
Let Therefore, it is possible to detect the opening of the door based on the change in the output of the door opening sensor 35, and in combination with the outputs of other sensors to be described later, an abnormal state is generated, for example, the door 11 without depending on a normal procedure. It is possible to detect that the is opened.

FIG. 2 is an enlarged schematic view of a main part of the first locking device 40. FIG. 3A shows a state where the rod-shaped lock piece 43 is retracted inside the door 11, and the count sensor 41
The push button portion 44 of is in a state of being projected by the spring force. FIG. 11B shows a state in which the lock piece 43 is projected by inserting the key 51 into the key hole 50 and rotating it by a predetermined angle. In this state, the push button portion 44 of the count sensor 41 is pressed and retracted. As schematically shown in FIG. 7C, the count sensor 41 is in the ON state when the lock piece 43 is projected and the electric contact 49 is closed. However,
ON / OFF may be reversed. The same applies to the other push switches.

FIG. 3 shows the main body 2 of the second lock device 20.
1 shows an example of the internal configuration. 3A is a front sectional view of the inside of the main body portion 21, FIG. 4B is a plan sectional view, and FIG. A worm gear 26 is attached to a rotating shaft of a motor 25 fixed to the main body (housing) 21, and the worm gear 26 is engaged with the worm wheel 27. The worm wheel 27 is fixed to a shaft 28 fixed to the housing, and is arranged so as to rotate according to the rotation of the motor 25. At least the free end side of the shaft 28 is provided with a screw thread so as to be screw-engaged with a screw groove of the internal cavity of the lock piece 22. The lock piece 22 is configured to slide in a cavity formed by a part of the housing 21 in accordance with the rotation of the shaft 28 and to project / retract from the main body 21. A protrusion 29 (FIG. 3A) is provided on the base side of the lock piece 22, and this protrudes from a slide groove 39 provided in the cavity wall. The protrusion 29 prevents the lock piece 22 from rotating together with the shaft 28, and also functions as a push button operation portion of the lock sensor 31 and the unlock sensor 32. That is, at the maximum protruding position of the lock piece 22, the protrusion 2
9 pushes the push button portion of the lock sensor 31 to
Let N. Conversely, at the maximum retracted position of the lock piece 22, the protrusion 29 presses the push button portion of the unlock sensor 32 to turn it on.

FIG. 4 is a block diagram showing an example of the control hardware configuration related to the second lock device 20 in the present embodiment.

The system of FIG. 4 associated with the lock device 20 is controlled by a CPU (microprocessor) 61. The CPU 61 is connected to the ROM 6 via the system bus.
2, RAM 63, flash memory 64, voltage drop detection circuit 67, motor drive circuit 71, buzzer drive circuit 73,
It is connected to the input / output (I / O) control unit 75 and the display panel 80.

The ROM 62 is a read-only memory that stores control programs executed by the CPU 61 and fixed data. The RAM 63 is a volatile readable / writable memory that provides a work area used by the CPU 61 and a temporary storage area for data. The flash memory 64 is a readable / writable non-volatile memory.

The motor drive circuit 71 controls the motor 25 under the control of the CPU 61. Buzzer drive circuit 73
Controls the buzzer 74 as an alarm means under the control of the CPU 61.

The CPU 61 receives the count sensor 41, the shift sensor 15, and the
The ON / OFF state of each of the lock sensor 31, the unlock sensor 32, and the door opening sensor 35 is recognized. Also,
ON / OFF of various switches in the operation panel 80 described later
It also recognizes the F state.

The operation panel 80 controls a display 82 using a seven segment display element or a liquid crystal, a display control circuit 81 of this display 82, a key group 84 such as individual push keys or a numeric keypad, and this key group 84. Control circuit 83
In addition, it has various switches (keys). The various switches include an effective switch 85 and a start switch 86, and depending on the configuration of the operation panel 80, as will be described later,
It may include a set switch 87, a reset switch 88, a count switch 89, and a shift switch 90.

Operating power for the system of FIG. 4 is provided by power supply 66. The power supply 66 may be a battery or an adapter that obtains an operating voltage from an AC power supply voltage. Considering the occurrence of battery exhaustion and power failure, it is preferable to have a rechargeable battery charged from an AC power supply. However, since the voltage drop detection circuit 67 is provided and the processing described below is performed, it is possible to deal with battery exhaustion and power failure, so that it is possible to handle AC power supply driving without a rechargeable battery or driving only with dry batteries. is there.

FIG. 5 shows a configuration example of the operation panel 80.
The power ON switch 65 turns on the direct power supply 66 (FIG. 4).
・ Control OFF. The display 82 is used to confirm the personal identification number input when setting the personal identification number. The enable switch 85 is a switch that is set by the user to enable / disable the lock device 20. The ten-key pad 84 is a group of keys used when setting the personal identification number. The start switch 86 is a switch for the user to lock / unlock the lock device 20 indoors without using the key 51. An operation example of this operation panel will be described later.

FIG. 6 shows another configuration example of the operation panel 80. In this example, instead of the numeric keypad 84 in FIG. 5, the set switch 8 as an individual key (push button switch) is used.
7, a reset switch 88, a count switch 89, and a shift switch 90 are provided.

A specific operation example of the above system configuration will be described in detail below.

FIG. 7 is a flow chart showing an example of processing when the user sets a personal identification number using the operation panel 80 as shown in FIG. 5 or 6. Although various methods can be considered for starting this processing, for example, the power ON switch 65 is used.
After turning on, the start key 86 is pressed for a predetermined time (for example, 3
Start by pressing and holding for more than 2 seconds. Of course, a dedicated key for starting the personal identification number setting process may be provided.

In FIG. 7, first, the variable j representing the digit position of the numerical value of the personal identification number is reset to 0 (S11), and the input of a numerical key from the user is awaited (S12). Preferably,
The display device 80 indicates the digit position to be input to the user by performing processing such as blinking a predetermined display (for example, numeral 8) at the digit position to be input. In the case of the operation panel of FIG. 5, the user operates the ten key 84. The numerical value (n) input from the ten key 84 is input to the array D9 (j) (S14). In the case of the operation panel shown in FIG. 6, the number of ONs by pressing the count key 89 is counted, and the count value when the shift key 90 is pressed is set as the numerical value n of the digit. The entered numerical value is confirmed and displayed at the relevant digit position.

After that, the digit position j value is incremented (S15) until the j value exceeds 2 (S16, Ye
s) and repeat the input of the above numerical values. In this example, j =
An example is shown in which a three-digit number of 0, 1, 2 is used as the personal identification number. If the reset key is pressed in the middle of this loop processing (S13, Yes), the process returns to step S11 and the secret code is input again from the beginning.

If the reset key is pressed after j> 2 (S17, Yes), the process returns to step S11. When the set key is pressed (S18, Yes), the array value input at that time, that is, D (0), D
(1) and D (2) are stored in the flash memory 64 in a nonvolatile manner (S19).

Although the personal identification number is three digits in this example, it is not limited to three digits, and one digit, two digits other than three digits,
It is possible to have an arbitrary number of digits of 4 digits or more. Also,
The number of digits may be a fixed value in advance, or the number of digits itself may be selected and set by the user. In the latter case, it is sufficient to allow the user to input a numerical value of a desired digit when setting the personal identification number.

Next, a normal process which is always executed while the power of the second lock device 20 in the present embodiment is turned on will be described with reference to the flowchart of FIG.

First, it is checked whether the lock sensor 31 is in the ON state (S21). If it is not in the ON state, it is checked whether the valid switch 85 is in the "valid" state (S22). If it is not in the valid state, nothing is performed and the process returns to step S21. If it is in the valid state, it is checked whether or not the count sensor 41 has changed from the OFF state to the ON state (S23). Count sensor 41 is O
The change from the FF state to the ON state corresponds to the user locking the first lock device 40 with the key 51. When the change of the count sensor 41 from the OFF state to the ON state is not detected, nothing is performed and the step S21 is performed.
Return to. When it is detected that the count sensor 41 has changed from the OFF state to the ON state, the second lock device 20
That is, the electric lock is locked (S24). After confirming that the lock sensor 31 is turned on (S25), the buzzer 74 (FIG. 4) is activated (S26). This buzzer sound is for notifying the user that the electric lock has been locked, and sounds, for example, “boo” for a relatively long time. Further, the flag F is set to 1 in order to store that the electric lock is turned on, and the flag F is stored in the flash memory 64 (S27). After that, the process returns to the first step S21.

In the subsequent processing, since the lock sensor is ON when returning to step S21, the Yes
Proceed to the side branch. First, the count sensor 41 goes from ON to O
It is checked whether it has changed to FF (S31). The fact that the count sensor 41 has changed from ON to OFF means
This means that the user has unlocked the first lock device 40. If the count sensor 41 does not change from ON to OFF, the process returns to step S21. When the change from ON to OFF is confirmed, the count value variable i and the digit position variable j
Are initialized to 0 (S32), and the following processing is performed.

First, the count sensor 41 is turned from OFF to ON.
→ A change of OFF is detected (S33). Such a change means that the user performs the locking operation with the key 51 inserted in the key hole and immediately after that the unlocking operation is performed. Every time such an operation is performed, the count value i is incremented (S34). If the count value i exceeds 9 (S35, Yes), it is an erroneous operation, so the buzzer sounds (S36) and the process returns to step S32. This number "9"
Corresponds to the case where the one-digit numerical value is 0 to 9. The one-digit numerical value does not need to be 9 at maximum, and may be 7, for example. The buzzer sound in step S36 is for notifying a user's erroneous operation, and is different from the buzzer sound in step S26, for example, a buzzing sound. When the shift sensor 15 is turned on with the count value i reaching a certain value (S41, Yes), it is a signal of a digit shift by the user. Therefore, a buzzer sound is generated to inform the user (S4).
2) The digit shift process starts from step S44. The buzzer sound at this time is preferably different from those of the above two types, for example, a sound of “buzz”. It should be noted that the way of sounding the buzzer is an example, and the present invention is not limited to this.

In the present embodiment, the shift sensor 15 is used when the user voluntarily wants to input a numerical value again from the beginning.
Push switch for a predetermined time (for example, about 2 or 3 seconds)
It is sufficient to continuously press the above. Therefore, in step S42, when the shift sensor 15 is continuously in the ON state for the predetermined time or longer (S43, Yes), the digit shift process (after S44) is not proceeded to, but the step S is performed.
After 36, the process returns to step S33.

In the digit shift process, first, the current count value i is stored in the array d (j) as the numerical value of the digit before shift (S44). Then, the digit position j is incremented (S45). The count value i is set to 0 until the value of the incremented new digit position j becomes 3 (S46).
To step S33, and the input operation of the count value at the new digit position is accepted.

If j = 3 in step S46, it means that all the digits of the personal identification number have been input, so that the personal identification numbers D (0), D (1), D previously stored in a nonvolatile manner are stored.
(2) is compared with the input d (0), d (1), d (2), respectively (S48). If any one of the corresponding digit values does not match, it is determined that the personal identification number entered by the user is incorrect, and the buzzer O in step S36.
The process returns to step S33 via N processing.

When the numerical values at all the digit positions match, the electric lock 20 is unlocked (S49). At this time, it is confirmed that the unlock sensor 32 is turned on (S50, Ye
s), the buzzer is turned on (S51). The buzzer sound at this time is, for example, a comparatively long ringing sound “boo” like the buzzer sound at the time of locking in step S26. Of course, this buzzer sound may be different from any other buzzer sound. After the buzzer sounds, the flag F is reset to 0, and this flag value is stored in the flash memory in a nonvolatile manner (S52). After that, the process returns to the first step S21.

By the way, the lock device 2 which is an electric lock
It is desirable that 0 can be operated by the key 51 from outside and can be locked and unlocked arbitrarily without using the key 51 indoors. Such operation processing will be described with reference to the flowchart of FIG. With the power of the operation panel 80 of FIG. 5 or 6 turned on, the start key 86
When is pressed for a short time, the CPU 61 is interrupted,
The process of FIG. 9 is started as an interrupt process. At this time, if the valid switch 85 is in the "valid" state (S6
1, Yes), until the lock sensor is confirmed to be ON (S63, Yes), the motor 25 is driven to lock the electric key (S62). Then, the flag F is set to 1 and stored again in the flash memory (S64). If the valid switch 85 is in the "invalid" state, the motor 25 is operated until the ON state of the unlock sensor is confirmed (S66, Yes).
Is driven in the reverse direction to unlock the electric key (S65). Then, the flag F is set to 0 and stored again in the flash memory (S67). In this way, the lock device 2
0 can be operated without using the key 51.

If the lock device 20 remains in the locked state at the time of power failure or battery exhaustion, even a legitimate user cannot unlock the lock. According to FIG. 10 and FIG.
A process for dealing with such a problem will be described.

FIG. 10 shows the CPU interrupt processing performed when the voltage drop detection circuit 67 of FIG. 1 detects that the operating voltage has dropped to a preset level. The power supply 66 may be equipped with a rechargeable battery or capacitor having a predetermined capacity or more so that this process is executed before the voltage drops to a voltage level at which the power supply becomes inoperable even in the case of a sudden power failure when using an AC power supply. preferable. First, it is checked whether the lock sensor is in the ON state (S71). If it is ON, the electric lock is forcibly released (S72). After confirming that the unlock sensor is turned on (S7
3, Yes), an alarm is issued to the user (S7)
4). This alarm is indicated by the buzzer 74 and / or the indicator 8
Perform by 0.

FIG. 11 shows a process performed after a power failure recovery or battery replacement. First, the current value of the flag F is read from the flash memory to check the state of the lock device 20 immediately before (S81). If F = 1 (S
82, Yes), which means that the electric lock is in the locked state. Therefore, when the unlock sensor is ON, that is, in the unlocked state at present (S83, Yes), the electric lock is locked (S84). As a result, it is confirmed that the lock sensor has been turned on (S85), and this processing ends.

If F = 1 in step S82, the electric lock is in the unlocked state. Therefore, if the lock sensor is ON, that is, in the locked state for some reason (S86, Yes), the electric lock is set. The lock is unlocked (S87). This confirms that the unlock sensor is turned on (S88). In any case, since the purpose of this process is to return the lock device 20 to the original state based on the flag value, the value of the flag F is not manipulated.

FIG. 12 shows a processing flow for detecting an abnormal situation in which the door is illegally opened. This process is an interrupt process executed when the door opening sensor 35 (FIG. 1C) is turned on. Door open sensor 35
When is turned on, first, the state of the lock sensor at that time is checked (S91). The fact that the door opening sensor 35 is turned on means that the door 11 has been opened, and in the normal state, the lock piece 22 of the locking device 20 should be retracted and the lock sensor should be in the off state. Therefore, if the lock sensor is ON, it means that the door has been opened without unlocking the electric lock, and thus the buzzer is continuously rung, for example (S92). On the other hand, the unlock sensor should be in the ON state. Further, in the normal state, the unlock sensor should be in the ON state. Therefore, even if the unlock sensor is not ON (S93), the buzzer is continuously rung (S92). In this process, the lock sensor and the unlock sensor double check the electric lock status, but if only one of the lock sensor and the unlock sensor is checked, it is normal.
It is also possible to judge an abnormal state.

Although the preferred embodiments of the present invention have been described above, various modifications and changes other than those described above can be made without departing from the scope of the invention described in the claims. For example, the installation positions of the lock device 20 and the shift sensor 15 are not limited to the illustrated positions.

Further, although the shift sensor 15 for shifting the digit is operated by using a slight gap in the door, it is possible to use other means. For example, another sensor for detecting the movement of the key 51 along the longitudinal direction may be provided. Alternatively, the digit shift may be performed by detecting that the count sensor 41 is continuously turned on for a predetermined time or longer with the key 51.

Although the buzzer is used as the alarm means, it is also possible to use other means such as a light emitting means.

A motor was used for the electric lock device,
Other electrically controllable drive means such as a solenoid may be used.

[0056]

According to the present invention, not only can a plurality of locks be locked and unlocked using a single key, but one of the locks must be operated by a key corresponding to a personal identification number. Therefore, the safety can be improved. Also,
Since it can be configured by adding the second lock to the existing lock device, the double lock device can be realized at a relatively low cost.

[Brief description of drawings]

FIG. 1 is a plan sectional view (a) of a door to which the present invention is applied,
It is a front sectional view (b) and a side sectional view (c).

FIG. 2 is an enlarged schematic view of a main part of the first lock device according to the embodiment of the present invention.

FIG. 3 is a diagram showing an example of an internal configuration of a main body portion of a second lock device according to the embodiment of the present invention.

FIG. 4 is a block diagram showing an example of a control hardware configuration related to a second lock device according to the embodiment of the present invention.

FIG. 5 is a diagram showing a configuration example of an operation panel in the embodiment of the present invention.

FIG. 6 is a diagram showing another configuration example of the operation panel in the embodiment of the present invention.

FIG. 7 is a flowchart showing a processing example when a user sets a personal identification number using the operation panel according to the embodiment of the present invention.

FIG. 8 is a flowchart showing an example of normal processing that is always executed during power-on of the second lock device according to the embodiment of the present invention.

FIG. 9 is a flowchart showing a processing example for locking and unlocking the second lock device indoors according to the embodiment of the present invention.

10 is a flowchart of a processing example performed when the voltage drop detection circuit of FIG. 1 detects that the operating voltage has dropped to a preset level.

FIG. 11 is a flowchart of an example of processing performed when power is restored or when batteries are replaced in the embodiment of the present invention.

FIG. 12 is a flowchart of a processing example for detecting an abnormal situation in which a door is illegally opened according to the embodiment of the present invention.

[Explanation of symbols]

11 ... Door, 12 ... Hinge, 13 ... Knob, 15 ... Shift sensor, 17 ... Opening part, 18 ... Frame, 19 ... Locking piece,
20 ... Lock device, 21 ... Main body part, 22 ... Lock piece, 2
4 ... Fastener, 25 ... Motor, 35 ... Door opening sensor, 3
6 ... Switch operation member, 37 ... Angled slope portion, 40 ... Lock device, 41 ... Count sensor, 42 ... Opening portion, 43 ...
Lock piece, 50 ... Key hole, 51 ... Key, 66 ... Power supply, 74 ...
Buzzer, 80 ... Operation panel

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E05B 35/12 E05B 45/06 E05B 47/00 E05B 49/00 E05B 65/08 E05B 17/22

Claims (4)

(57) [Claims] 1. A double lock device in which a second lock is added to a first lock that is mechanically locked / unlocked by operating a single key, wherein the single key operation is performed. The second lock which is locked / unlocked by electric control by means of, a personal identification number setting means for setting a personal identification number in advance, and the single key in a state where the single key is inserted in the first lock. A first sensor for detecting the rotational movement of the second sensor, a counting unit for counting the number of detections by the first sensor, and a second locking operation by the first key in the unlocked state of the second lock. While locking the lock, the count value of the counting means associated with the operation of the single key in the locked state of the second lock is compared with the secret code number, and when the two match, the second lock is locked. A double lock device comprising: control means for unlocking. 2. The double lock device comprises a first storage means for storing in a nonvolatile manner a numerical value of a plurality of digits set as a personal identification number by the personal identification number setting means, and an operation of the single key. A digit shift means for shifting the digit of the count value of the counting means and a second storage means for storing the count value of each digit are provided, and the control means is provided in the first and second storage means. 2. The double lock device according to claim 1, further comprising a comparison means for comparing the stored count values of each digit. 3. The first and second locks are installed on a door, and an abnormality detecting means for detecting that the door is opened in a locked state of the second lock; 3. A means for issuing an alarm when an abnormality is detected, further comprising:
The described double locking device. 4. A means for detecting a decrease in operating voltage of the second lock and the control means, and a storage means for non-volatilely holding the current locked / unlocked state of the second lock as flag information. Further, the control means forcibly unlocks the second lock if the second lock is in a locked state when the operating voltage is detected, and the flag held in the storage means when the operating voltage is restored. The double lock device according to claim 1, 2 or 3, wherein the locked / unlocked state of the second lock is returned to the original state based on the information.