JPH0321584Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a key device with an alarm, and more particularly to a key device that issues an alarm when an object other than a compatible key is inserted.

``Problems with the invention'' Conventionally, alarm devices have been proposed that generate a loud alarm when the ignition key is destroyed. This conventional device is effective in preventing theft of the automobile itself.

However, the ignition key was not destroyed, only the door key of the car was destroyed, and this was of no use in preventing damage such as theft of items inside the car.

The present invention has been made to effectively prevent such damage, and an object of the present invention is to provide a key device with an alarm that issues an alarm when an object other than a compatible key is inserted.

"Structure of the invention" The key device with an alarm of the present invention has a first switch means that is activated when a key, etc. is inserted into the receptacle of the key device, and a first switch that is activated when a predetermined amount or more of the key, etc. is inserted into the receptacle. a second switch means comprising a switch means and/or a switch means activated when the key is rotated by more than a predetermined amount; an alarm means for generating an alarm; and the alarm means is activated based on the operation of the first switch means. The present invention is characterized in that it also includes a control circuit for stopping the operation of the alarm means based on the operation of the second switch means.

``Operation'' If the key is compatible, it will be accepted into the receiving part and rotated without any problem, so the time required for the key to be inserted a specified amount into the receiving part or the time required for the key to be rotated for a specified amount or more. is extremely short.

On the other hand, if it is a key other than a compatible key, it will usually not be completely accepted into the receptacle, or even if it is accepted, it will not be able to be rotated completely, so even if you forcefully insert it and rotate it, it will take a long time. It takes.

Therefore, based on this difference in required time, abnormal key operations can be detected and an alarm can be issued.

"Example" The present invention will be described in more detail below based on the example shown in the drawings. Here, FIG. 1 is a sectional view of the cylinder part of a key device with an alarm according to an embodiment of the present invention, and FIG.
The figure is an explanatory diagram of a state in which a suitable key is inserted into the cylinder part shown in Fig. 1, Fig. 3 is a circuit diagram showing the electric circuit part of the key device with alarm shown in Fig. 1, and Fig. 4 is a diagram of the present invention. FIG. 5 is an explanatory view showing the state in which the key is inserted and rotated in the embodiment shown in FIG. 4, and FIG.
FIG. 3 is a circuit diagram of an electric circuit section of the embodiment shown in the figure.
Note that the present invention is not limited to this example.

The cylinder portion 1 of the alarm key device 100 shown in FIG. 1 has basically the same structure as a conventionally known automobile door key. That is, a rotor case 8 is attached to an outer panel 2 of an automobile door via a gasket 3, a cover 4 is placed over the front of the rotor case 8, and a rotor 9 is housed within the rotor case 8. A rotating plate 6 that rotates together with a rotor 9 is in close contact with the cover 4, and a lid 7 that closes the key insertion hole 5 is attached to the rotating plate 6. This lid 7 is for preventing rainwater etc. from entering.

It should be noted that, unlike conventional door keys, a first microswitch 11 is installed in the space between the rotor 9 and the cover 4, and a second microswitch 12 is installed in the inner part of the rotor 9.
is installed.

As shown in FIG. 2, when a suitable key 50 is inserted into the cylinder portion 1, the lid 7 is opened and the first micro switch 11 is actuated. Further, since the suitable key 50 is easily inserted to the innermost part of the rotor 9, the second micro switch 12 is activated immediately. In other words, both the first microswitch 11 and the second microswitch 12 are activated.

However, when a foreign object such as a screwdriver is inserted, the width of the key insertion hole 5 is limited by the width of the keyway of the rotor 9, and the foreign object cannot be inserted all the way. Therefore, in this case, the first microswitch 11 is activated, but the second microswitch 12 is not activated.

Incidentally, in order to save space for incorporating a single micro switch as the micro switches 11 and 12, a contact point is simply provided, and when the key 50 or the lid 7 comes into contact with the contact point, electricity is applied and the switch function is performed. You can do it like this.

As shown in FIG. 3, this alarm key device 10
In the electric circuit section 10 of No. 0, the falling delay circuit 13 is energized when the first micro switch 11 is turned on.

The input of the falling delay circuit 13 is the first
When both the first microswitch 11 and the second microswitch 12 are on, the voltage is at the ground level, and when either is off, the voltage is at the power supply voltage level via the resistor R.

When the input falls from the power supply voltage level to the ground level, the falling delay circuit 13 drops the output from the power supply voltage level to the ground level after a predetermined delay time. Otherwise, it follows the input and outputs the same level as the input.

When the output of the falling delay circuit 13 is at the power supply voltage level, the transistor Tr is turned off and the buzzer 14 is not activated, but when it reaches the ground level, the transistor Tr is turned on and the buzzer 14 is activated.

The first microswitch 11 is turned on when activated, and the second microswitch 12 is turned off when activated.

Now, when nothing is inserted into the cylinder section 1, the first micro switch 11 is off, so the falling delay circuit 13 is not energized.
Its output does not fall to ground level. Therefore, the transistor Tr remains off and the buzzer 14 does not operate. In other words, in this state, nothing operates and no power is consumed.

Considering the case where a suitable key 50 is inserted, first the first microswitch 11 is turned on, so that the fall delay circuit 13 is energized. At the same time as the first microswitch 11 is turned on, the input of the fall delay circuit 13 falls to the ground level, but the output remains at the power supply voltage level for a certain delay time.

Therefore, during this delay time, the transistor
The Tr is not turned on and the buzzer 14 is not activated.

Since the suitable key 50 is inserted deep into the rotor 9 without any hindrance, the second micro switch 12 is turned off in a very short time after the first micro switch 11 is turned on. As a result, the input of the falling delay circuit 13 remains at the ground level for a very short time, but immediately returns to the power supply voltage level.

The falling delay circuit 13 has no delay time for the rising edge when the input changes from the ground level to the power supply voltage level.
Its output is never dropped to ground level. Therefore, the transistor Tr is not finally turned on and the buzzer 14 is not activated.

However, when a foreign object such as a screwdriver is inserted, the foreign object is not inserted all the way into the rotor 9, so the second micro switch 12 remains on without being activated, and when the delay time elapses. The output of the falling delay circuit 13 falls to the ground level. Therefore, the transistor Tr
is turned on, and the buzzer 14 is activated.

Thus, when a suitable key 50 is inserted, the buzzer 14 does not sound, but when a foreign object is inserted, the buzzer 14 sounds to alert the surroundings.

From another point of view, it is considered that there is no problem even if the buzzer 14 operates for a very short period of time when the key 50 is inserted deep into the cylinder part 1, so in that case, the fall delay circuit 13 is omitted. You may.

FIG. 4 schematically shows the front of a key device with alarm 100' according to another embodiment of the present invention, as seen from between the cover 4 and the first micro switch 11 in FIG. corresponds to

The rotor case 8, rotor 9, and first microswitch 11 have the same configuration as the embodiment device 100 described above, and are given the same reference numerals.

The difference from the above embodiment device 100 is that instead of the second micro switch 12, optical fibers 15 and 16 are provided facing each other in a part of the rotor case 8 that protrudes from the rotor 9. That is what we are doing.

If nothing is inserted into the cylinder part 1',
Optical fibers are optically coupled. but,
As shown in FIG. 5, when a matching key 50 is inserted into rotor 9 and rotated, it breaks the optical coupling between optical fibers 15 and 16.

FIG. 6 shows the electric circuit section 10' of this key device with alarm 100'.

When the first microswitch 11 is turned on, the falling delay circuit 13 is energized. Also,
The LED 17 is energized and emits light. This light is incident on a phototransistor 18 through optical fibers 15 and 16. The phototransistor 18 turns on when light is incident, and sets the input of the falling delay circuit 13 to the ground level.

When the optical coupling between the optical fibers 15 and 16 is broken, the phototransistor 18 is turned off.
Then, due to the resistance R, the falling delay circuit 1
Input No. 3 becomes the power supply voltage level.

The output side circuit of the falling delay circuit 13 is
This is the same as that in the electric circuit section 10 of the embodiment device 100.

Next, the operation will be explained. First, as shown in Fig. 4, when nothing is inserted into the cylinder part 1',
The first microswitch 11 is off, and the electric circuit section 10' performs no operation and consumes no power.

Next, when a suitable key 50 is inserted into the cylinder part 1', the first micro switch 11 is opened by the lid 7.
is activated and turned on. Then, the LED 17 is turned on, and the light is guided to the phototransistor 18 by the optical fibers 15 and 16, and the phototransistor 18 is turned on, so that the input of the falling delay circuit 13 becomes the ground level. Therefore, the falling delay circuit 13 tries to lower the output to the ground level after a predetermined delay time. However, since the matching key 50 is immediately rotated and breaks the optical coupling between the optical fibers 15 and 16, the phototransistor 18 is immediately turned off and the falling delay circuit 13 is turned off, as shown in FIG. The input becomes the power supply voltage level via the resistor R.

Eventually, a matching key 50 is inserted and
If it is rotated immediately, the output of the falling delay circuit 13 will never reach the ground level, the transistor Tr will be off, and the buzzer 14 will not be activated.

However, even if a key other than the compatible key 50 is inserted and attempted to be turned, the rotor 9 will not rotate easily, so the falling delay circuit 1
After a predetermined delay time of 3 has elapsed, the output of the falling delay circuit 13 falls to the ground level, the transistor Tr is turned on, and the buzzer 14 is activated.

Thus, if a matching key 50 is inserted and immediately rotated, no action will occur, but if a key other than the matching key is inserted, the buzzer 1 will be activated.
4 will sound and an alarm will be issued.

Note that this key device with alarm 100' can also prevent forgetting to remove the key. In other words, after inserting the matching key 50 and turning it to open the door, there are cases where the key 50 is returned to its original position and forgotten without being removed.
As can be seen from the figure, when the key 50 is returned to its original position, the phototransistor 18 is turned on again, so that the buzzer 14 is activated after a predetermined delay time. Therefore, if the key 50 is not removed within the predetermined delay time, the buzzer 14 will sound, which can be used as a warning in case the key 50 is forgotten.

If the insertion of the key is detected and the warning device is activated, and the rotation of the key is detected and the activation is stopped, it is very preferable to prevent forgetting to remove the key.

As another embodiment, instead of operating the first micro switch 11 with the lid 7, an object inserted into the cylinder portion 1 may perform the switch function by blocking the optical path of the photo interrupter.
One example is the one used as a switch means.

The key device with an alarm according to the present invention can be applied not only to a door key of an automobile but also to a trunk key of an automobile, a locker, a key for a car, and the like.

"Effects of the Invention" According to the invention, there is a first switch means that operates when a key or the like is inserted into the receptacle of the key device, a switch means that operates when a predetermined amount or more of the key or the like is inserted into the receptacle, and and/or a second switch means comprising a switch means which is activated when the key is rotated by more than a predetermined amount; an alarm means which generates an alarm; and based on the operation of the first switch means, the alarm means is activated and the second There is provided a key device with an alarm, characterized in that it is equipped with a control circuit that stops the operation of the alarm means based on the operation of the switch means described in item 2, whereby an object other than a suitable key is inserted into the cylinder side. This is a good key for crime prevention, as it will issue an alarm when something happens.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the cylinder part of a key device with alarm according to an embodiment of the present invention, Fig. 2 is an explanatory view of the cylinder part shown in Fig. 1 with a matching key inserted, and Fig. 3 is an explanatory view of the cylinder part shown in Fig. 1. FIG. 1 is a circuit diagram showing the electric circuit section of the key device with alarm, FIG. 4 is a schematic front view of the cylinder section of another embodiment of the present invention, and FIG. 5 is a diagram showing the embodiment shown in FIG. 4. An explanatory diagram showing a state in which the key is inserted and rotated, and FIG. 6 is a circuit diagram of the electric circuit section of the embodiment shown in FIG. 4. Explanation of symbols: 1...Cylinder section, 4...Cover, 7...Lid, 8...Rotor case, 9...Rotor, 10...Electric circuit section, 11...First micro switch, 12... second micro switch,
14...buzzer, 15,16...optical fiber,
100, 100'...Key device with alarm.

Claims (1)

[Claims for Utility Model Registration] 1. A first switch means that operates when a key, etc. is inserted into a receiving portion of a key device, a switch means that operates when a predetermined amount or more of a key, etc. is inserted into a receiving portion of a key device, and/or a second switch means which is activated when the key is rotated by more than a predetermined amount; an alarm means which generates an alarm; the alarm means is actuated based on the operation of the first switch means; A key device with an alarm, comprising a control circuit that stops the operation of the alarm means based on the operation of the switch means. 2. A key device with an alarm according to claim 1 of the utility model registration, which is used as a door key for an automobile.