JPS5922629Y2 - alarm device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an easily installed alarm device for detecting the rotation of a knob or the like when a door is opened or closed.

Conventional devices of this kind include those that turn a microswitch ON and OFF when the door is opened and closed, which sounds a buzzer, those that use a magnet to activate a reed relay and sound an alarm, and those that use light on a sensor to notify when the device is activated. However, there are disadvantages in practical use, such as the setting being difficult or expensive, and the screw marks left during installation.

The present invention was devised to eliminate these drawbacks, and according to the present invention, an extremely simple and inexpensive alarm device can be provided.

An embodiment of the present invention will be described below in detail with reference to an embodiment shown in the drawings.

FIG. 1 shows an embodiment of the present invention.

1 is an alarm, 2 is a buzzer ON/OFF switch, and 3 is a hole provided in the protrusion of the alarm housing.

Reference numeral 4 denotes a hook forming a buzzer operating portion of the alarm device 1, and when this hook is pressed downward, the buzzer inside the alarm device sounds.

5 ties both ends to the hole 3 and the hook 4 with a fiber (for example, thread).

6 is a door knob that opens and closes the door by rotating it.

FIG. 2 is a diagram showing one embodiment of the alarm device 1.

In the figure, 7 is a buzzer, 8 is a battery, 9 is a switch that turns the circuit on and off, 10 is a stopper that stops the alarm, and 4 is inserted through the housing 1 with one end protruding outside the housing to suspend the housing. A hook that forms a lower part and whose other end is inside the housing and forms a switch actuating part; 11 is a spring that always tries to push down the hook 4; 1 is a housing that accommodates parts 7 to 11; 3 is a This is a hole provided in the protrusion of the alarm housing.

The buzzer 7, the battery 8, and the switch 9 are electrically connected, and when the hook 4 presses the push button of the microswitch 9, the circuit of the buzzer'-7° battery 8 and the switch 9 is closed, and the buzzer 7 emits an alarm sound. A circuit is formed to emit .

The stopper 10 is inserted between the push button of the switch 9 and the hook 4 when the alarm is not in use, and is used to push up the hook 4 and prevent the generation of an alarm sound when the alarm is not in use. OFF switch 2 is formed.

As shown in FIG. 1, the alarm device of the present invention is used by wrapping the fiber 5 around the knob 6 more than 50% times and suspending the alarm device 1.

When the alarm device 1 is hung, the hook 4 resists the spring 11 due to the weight of the alarm device 1 to turn off the contact point of the switch 9.

Now, when the knob 6 is turned in the direction of the arrow from the outside of the door, the fiber 5 moves in the direction of the arrow and the tension on the hook 4 is loosened, so the hook 4 is lowered and the contact of the switch 9 is turned ON to sound the buzzer.

FIG. 3 shows an embodiment in which two alarm devices are used.

As shown in FIG. 3, if two alarm devices are used and the respective fibers are wound in opposite directions around the door knob 6, detection can be made even when the knob 6 is rotated in either the left or right direction.

Further, another embodiment is shown in FIG.

If you use two microswitches or a selector switch as shown in Figure 4, and can turn on the circuit by moving the hook 4 up and down, when the knob is turned left and right with one alarm,
It is possible to sound an alarm.

As explained above, the alarm device according to the present invention has a great effect when put into practical use because it can easily and inexpensively detect intrusion into a room by opening or closing a door, etc.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the alarm device of the present invention, Fig. 2 is a diagram of an embodiment of the alarm device used in Fig. 1, and Figs. 3 and 4 are diagrams showing an embodiment of the alarm device of the present invention. It is another Example figure. 1...Alarm, 2...Switch, 3.
...hole of alarm protrusion, 4 ... hook,
5...Fiber 6...Knob.

Claims (1)

[Scope of utility model registration request] An alarm having a buzzer whose switch contacts are connected by pressing a hook to form a closed circuit and emit an alarm sound, one end of which is engaged with the hook and the other end of which is engaged with a casing of the alarm, and the hook and the casing are engaged with each other. and a fiber that suspends the alarm so that the hook is actuated by tension or relaxation of the hook when the rotating body rotates, the fiber engaging the outer periphery of a rotating body.