JPS5868192A - Burglarproof key switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a security key switch. As shown in Figure 1, the security key switch When a caretaker needs to pass through entrance B for inspection, a warning circuit including the detection output of the optical detector C and security door switch D is opened so that no alarm is issued even if the caretaker passes through. It is used to release the alarm.

Conventional security key switches only have a built-in switch that closes or opens the circuit when the key is operated, so even a manager must open the security key switch and release the alarm before the alarm can be activated. I couldn't get into location A. Therefore, when using this security key switch in a building or residence, the security key switch had to be installed outdoors because if it was installed indoors, it would go into an alarm state when entering the building. Mounting it outdoors is not preferable from a security perspective, and if a security key switch mounted outdoors is left in the open state, it will not be able to be put into the alert state even if you are indoors. Therefore, the circuit configuration (Figure 3) was to use two security key switches, one installed outdoors and the other indoors, but this required two security key switches and required wiring work. Not only was it cumbersome, but it also had drawbacks such as the possibility that the outdoor security key switch could be deactivated.

The purpose of the present invention is to provide a crime prevention key switch that improves the above-mentioned drawbacks, and after closing the crime prevention key switch,
To provide a crime prevention key switch which does not issue an alarm output signal for a predetermined period of time even when a detection signal of an alarm device is input, and can release the alarm during that period. The present invention will be described in detail below according to one embodiment thereof.

In FIG. 4, 1 is a switch operated by a key, and when the key is operated to close the circuit, switch 1 maintains the closed circuit state. It then supplies power to other circuits. Reference numeral 2 denotes a warning device attached to the security location, and 3 and 3' designate input terminals for receiving output signals from the warning device 2. In this diagram,
An example is shown in which the alarm device 2 is composed of a reed switch 2a and a permanent magnet 2b attached to a door. When the door is opened, the alarm 2 detects that the door is opened by moving the permanent magnet 2b attached to the door away from the reed switch 2a and opening the contacts of the reed switch 2a. 4 is an alarm output circuit, and 4a is its output contact. A first control circuit 5 stops the operation of the alarm output circuit 4 for a predetermined period of time (time t1) after the switch 1 operated by the key is turned on. Reference numeral 6 denotes a second control circuit, which controls the alarm output circuit 4 for a predetermined period of time (12 hours) from the time when the detection signal of the alarm device 2 is taken in from the input terminals 3 and 3' via the loop monitoring circuit 7. Configure to stop working. 8 is a switch that closes when an attempt is made to destroy this security key switch. 4b is an alarm output terminal to which, for example, a siren S is connected to issue an alarm. 1a is a warning output terminal to which, for example, a lamp L is connected to display a warning state. The specific circuits of the first and second control circuits, loop monitoring circuit, and alarm output circuit are constructed as shown in FIG. That is, the alarm output circuit 4 is composed of a relay R provided with a contact 4a, and a series circuit of an SCR and a transistor Tr1. The first control circuit 5 is composed of a one-shot circuit, and by closing the switch 1 operated by a key, a voltage is applied to the input terminal A of the 1C1.
Q output changes from H level to L level. Then, when the capacitor C2 is charged via the resistor R2 and the time (t1 time) until the voltage becomes equal to or lower than the threshold voltage of the T2 terminal has elapsed, the Q output is restored to the H level. Since this Q output is connected to the base of the alarm resistor Tr1 of the alarm output circuit 4, even if there is an output from the alarm, the relay of the alarm circuit 4 remains for the time t1 after the key-operated switch 1 is closed. R does not work. FIG. 6 shows this state. Detection signal N of alarm device 2 during time t1 after closing switch 1 operated by the key [see Fig. 6 (IV)]
is taken in from the input terminals 3 and 3', no output is output from the alarm output circuit 4 [see FIG. 6 (IV)]. Then the second
The control circuit 6 shown in the figure will also be explained. Like the first control circuit 5, this second control circuit 6 is also constituted by a one-shot circuit. When the reed switch 2a, which is an embodiment of the warning device 2, is opened [see Fig. 6 (IV)], the transistor Tr2 of the loop monitoring circuit 7 becomes non-conductive, and the input terminal A of 1C2 becomes H level. 1C2
The Q output of is at the L level for a predetermined time (t2), and when the capacitor C4 becomes lower than the threshold voltage of the terminal T2, it is reversed to the H level, and the current that charges the capacitor C3 flows into the gate G of the SCR. , SCR becomes conductive.

When SCR becomes conductive, since transistor Tr1 is already conductive, relay R1 is energized, output contact 4a is closed, and alarm output P [see Figure 6 (IV)]
is output.

In this embodiment, voltage is supplied to each circuit by closing switch 1 operated by a key. Voltage is supplied to the circuits in advance, and when switch 1 is turned on, after time t1 has elapsed, It is also possible to apply only a voltage that turns on the transistor Tr1. Also, a loop monitoring circuit is not necessarily required.

Next, the operating state of this security key switch when it is installed indoors will be explained.

Closes the switch and supplies voltage to the circuit.

Then, the first control circuit 5 operates for a predetermined time (t1 time).
The warning output circuit becomes inactive. During this time, you can open the door and go out from security location A. Next, when going indoors, the operation of the alarm output circuit 4 is stopped for a predetermined time (time t1) when the detection signal is input to the loop monitoring circuit 7 from the terminal 3', so during that time, open the door, enter the house, and lock the door. Open the switch operated by . As a result, the alarm output circuit becomes completely de-energized and no output is produced.

As mentioned above, according to the present study, the key-operated switch is equipped with at least a key-operated switch, an input terminal for receiving an output signal from a warning device installed at a security location, and an alarm output circuit. In the crime prevention key switch, the alarm output circuit is activated when a detection signal is input from an input terminal that takes in the output signal of the alarm after being placed in a closed circuit state, and the switch operated by the key is placed in a closed circuit state. a first control circuit that stops the operation of the alarm output circuit for a predetermined period of time from the time of the alarm, and a second control circuit that stops the operation of the alarm output circuit for a predetermined period of time after the detection signal of the warning device is received from the input terminal. Since this security key switch is equipped with , the first or second control circuit 5 of the security key switch
, 6, during the time t1 during which the alarm output circuit 4 is in the stopped state, the alarm state can be changed to the canceled state or the detection means of the alarm device can be returned to the clean state. It is possible to provide an excellent security key switch that has improved the above-mentioned drawbacks.

[Brief explanation of drawings]

1 to 3 are diagrams showing a conventional example of the present invention, in which FIG. 1 is an explanatory diagram for use, and FIGS. 2 to 3 are electrical circuit diagrams. 4 to 7 are drawings for explaining the present invention in detail, in which FIGS. 4 to 5 are electric circuit diagrams, and FIGS. 6 to 7 are time charts. 1...Switch operated with a key, 2: Alarm device, 3,
3'... Input terminal that takes in the detection signal of alarm device 2,
4... Alarm output circuit, 5... First control circuit,
6...Second control circuit 7...Loop monitoring circuit,
8...Tamper switch. Fig. 3 v Fig. 4 Fig. 5 r--'-2α 7-] and) 3 -r , 1 1,, -'7-\ ↑ 7S Ty2'U□ □ j ← -→Ya Cape N, 2 -□-□ □□ I BA 1 , ,olIc・”j ) enter. Ki=-1□ 1 +RGl-41 1

Claims (3)

[Claims] (1) At least a key-operated switch, an input terminal for receiving an output signal from a warning device installed at a security location, and an alarm output circuit are provided, and after the key-operated switch is closed, the warning device is activated. In the security key switch, the alarm output circuit is activated when a detection signal is input from an input terminal that receives an output signal of a device, and the alarm output circuit operates for a predetermined period of time from when the switch operated by the key is closed. A first control circuit that stops the operation of the alarm output circuit, and a second control circuit that stops the operation of the alarm output circuit for a predetermined period of time after the detection signal of the alarm is taken in from the input terminal. Security key switch. (2) The security key switch according to claim 1, characterized in that the first and second control circuits are constructed as one-shot multi-circuits. (3) By closing the switch operated by the key,
3. The security key switch according to claim 1, wherein voltage is supplied to each of the first and second control circuits, the alarm output circuit, the loop monitoring circuit, and the alarm device.