JPS5929271Y2 - alarm device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm device that has an alarm function for door lock abnormality when the power is turned on.

2. Description of the Related Art Conventionally, there is a device that warns of an intrusion, etc. If there is an abnormality in the door lock when the power is turned on, the device identifies this as an intrusion, etc., and issues an alarm as an abnormality in the door lock.

FIG. 1 is a circuit diagram showing a conventional example of this type of device, in which when the warning switch SW is turned on, the security sensors D1, D2, 0, etc. such as door switches are activated. ..., if even one contact of Dn is open, thyristor 5CR1 is turned off, transistor Tr2 is turned on, and transistor Tr3 is turned off.
f, and the indoor and outdoor alarm circuits (2) and (2) do not operate, but the door abnormality alarm circuit (2) operates and notifies the door of abnormality.

■ is a warning means such as a hussar.

After all the security sensors D1...Dn are closed and the security switch SWl is turned on to enter the security state, the crime prevention switch D1. If any contact of D2...Dn is opened, the thyristor SCR is turned on, l'
Run sister Tr2 is 0ff1 Transistor Tr3
It's on! : Alarm circuits ■ and ■ are activated, but door lock abnormality alarm circuit m does not operate.

In this way, the conventional device of this kind has a door lock abnormality alarm circuit.
It was necessary to provide the alarm circuits separately from the alarm circuits ① and ②, which had the disadvantage of requiring a large number of parts.

This invention does not require a separate door lock abnormality alarm circuit, and has been devised so that if there is a door lock abnormality when the warning power switch is turned on, a door lock abnormality alarm is issued by simply providing a normally closed switch. It is something.

The drawings will be explained in detail below.

FIG. 2 shows an embodiment of the present invention, in which the alarm circuit I includes a normally closed security sensor D1, such as a door switch. D2...
...This is a circuit that issues an alarm indoors when one or more contacts of Dn open, and the alarm circuit (■) is a circuit that issues an alarm outdoors.

R1, R2, R3 are resistors, Tr4 is a transistor, 5
CR2 is a thyristor, and C1 is a capacitor.

5W21.5W2-2 is a warning switch that works together,
5W2-1 is a normally open contact, and 5W2-2 is a normally closed contact, and their operation order is such that they open after 5W2-1 closes.

With this configuration, the warning switch 5W2-1
When I closed the door and went into alert mode, the door was not fully locked and the security sensor D1. If one or more contacts among D2.-Dn are open, the transistor Tr4 activates the ONL alarm circuit through the resistors R, , R2 to notify indoors of an abnormality.

At the same time, the thyristor 5CR is connected to the differential circuit of C1 and R3.
Trigger power enters gate 2, warning switch 5W
Since it is short-circuited by 2-2, thyristor 5CR2
is not turned on and the alarm circuit (■) is not activated, so no alarm is issued outdoors.

Even if the contact of the warning switch 5W2-2 opens a while after the contact of the warning switch 5W2-1 is closed, the alarm circuit (2) does not operate because there is no trigger force.

In this way, it is possible to know that there is an abnormality in the door locking when only the alarm circuit (2) is activated.

Next, security sensor D1. D2......When all Dn contacts are closed, turn on the warning switch 5W2-1.5W.
When 2-2 is turned on, sw, -i is closed, and 5W2-2 is opened and the system is on alert, if an intruder opens the door or window and enters, the security sensors D1, D2...・
・When one of the contacts of Dn opens, the transistor Tr4 turns on and the alarm circuit I is activated to notify indoors of an intrusion, and the trigger by the differential circuits C1 and R3 activates the thyristor 5CR2 or onL alarm circuit and the alarm circuit is activated outdoors. will also be notified.

The switching element actuated by the trigger is the second
It is not limited to the iris shown in the embodiment shown in the figure, but includes monostable multivibrators, flip-flops,
Of course, it may be a device having a self-holding function or a timer function such as a timer.

As explained above, according to the present invention, a door lock abnormality can be detected simply by using a set of normally open contacts and normally closed molded contacts having an operating order as a warning switch, and the number of parts can be reduced.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional alarm device having a door lock abnormality alarm function, and FIG. 2 is a circuit diagram of an embodiment of the present invention. Dl, D2...Dn is a security sensor, ■ is an alarm circuit that issues an alarm indoors, ■ is an alarm circuit that issues an alarm outdoors, ■
indicates door lock abnormality alarm circuit, ■ indicates alarm means such as buzzer, SW
l, 5W2-1.5W2-2 is a warning switch, R1,
R2 and R3 are resistors, C1 is a capacitor Tr1 rTr
2 jTr3 y Tr4 is a transistor, 5CR
1,5CR2 is Cyrisk.

Claims (1)

[Scope of utility model registration request] 1. Means for short-circuiting the trigger signal input circuit only at the moment the power is turned on, comprising an alarm circuit (■) that operates when the security sensor is activated, and an alarm circuit (■) that activates in response to a trigger signal at the moment the security sensor is activated. An alarm device characterized by having. 2. The alarm device according to claim 1, in which the anti-wake sensor has a normally closed contact. 3. The alarm device according to claim 2, which short-circuits the trigger signal input circuit by means of a normally closed molded switch that is linked to a power switch and opens after the power is turned on.