JPH0453679Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a horn device suitable for use as an alarm sound generation means of a crime prevention system that notifies the intrusion of an illegal intruder into a building by an alarm sound. It is something.

[Prior art]

Generally, a security system includes a sensor device that detects the intrusion of an illegal intruder into a building, a horn device that is attached to the exterior wall of the building, etc., and that generates an alarm sound.
The main body device drives the horn device based on the detection signal of the sensor device. Among these, the horn device, as shown in FIG. 1, houses a horn-shaped sounding unit 3 by a back plate 1 and a horn cover 2 attached to the back plate 1, and the back plate 1 is attached to a wall surface. can be attached to.

[Problem that the invention attempts to solve]

By the way, since the horn device is attached to the outside wall of a building, for example, if a trespasser removes the horn device, the alarm will not sound even if the security system is activated, and the original purpose will not be achieved. become. Here, it is conceivable to provide a switch that detects that the horn device has been removed, and to generate an alarm sound based on the opening and closing of this switch. In this case, there are two possible cases: when the horn device is removed together with the back plate 1, and when only the horn case 2 is removed, so a switch that detects both of these cases is required.

In view of the above-mentioned circumstances, the object of this invention is to provide a horn device that can detect illegal removal of the horn device by a trespasser or the like with a simple and inexpensive configuration.

[Means for solving problems]

This invention consists of a guide hole formed through a base (back plate), a convex part formed on the inner wall of a cover (horn cover), a horn cover that is slidably fitted into the guide hole, and one end of which is inserted into the convex part. At the same time as coming into contact with the
It is characterized by comprising a switch means whose other end protrudes from the back surface of the base and is opened and closed by a compressive force acting between the one end and the other end.

[Operation] When the horn device of the present invention is installed, one end of the switch means, which is made of a member that is extendable and is biased in the extension direction by an elastic member, comes into contact with the convex portion formed on the cover. Also, the other end is
The horn device comes into contact with the object to which it is attached.

Generally, when removing the horn device, there are two possible methods, as described above.
First, the first method is to remove only the cover, and the second method is to remove the entire back plate.

When the horn device of the present invention is removed by the first method, the convex portion of the cover comes off from one end of the switch means, so the switch means is extended by the biasing force of the internal elastic member, thereby operating the sounding unit. do.

Also, when the horn device is removed by the second method, the switch means, which was previously blocked by the object, is extended. This causes the sounding unit to operate in the same manner as in the first method.

〔Example〕

Embodiments of this invention will be described below with reference to the drawings.

FIG. 2 is a side sectional view showing the structure of an embodiment of this invention. In this figure, back plate 1
As shown in FIG. 3, a square hole 1a penetrating through the back surface and a cylindrical portion 1b having a square cross-section are formed at predetermined locations, and the guide is guided by the square hole 1a and the cylindrical portion 1b. A hole 1c is formed. A switch 5 shown in FIG. 4 is slidably fitted into this guide hole 1c. In FIG. 4, reference numeral 6 denotes a case composed of a hollow prismatic member, one end 6a of which is closed and the other end 6b formed with a square hole 6c.
A guide rod 7 is provided on the inner wall of one end 6a of the case 6 and extends in the same direction as the longitudinal direction of the case 6, and a spring 8 is fitted around the outer periphery of the guide rod 7. Further, inside the case 6, a movable member 9 is provided which is guided by the guide rod 7 and the square hole 6c and is movable in the longitudinal direction of the case 6. This movable member 9 has a cylindrical portion 9a into which the guide rod 7 is inserted and is biased by a spring 8, a flange portion 9b that abuts the inner wall of the other end 6b of the case 6, and an external portion from the square hole 6c. A movable contact 10 is attached to the outer periphery of the cylindrical portion 9a. When the protrusion 9c of the movable member 9 protrudes from the case 6 as shown in the figure, the movable contact 10
are spaced apart from a pair of fixed contacts 11a, 11b each attached to case 6, and thereby switch 5 is in an OFF state. In addition, the protrusion 9
When the movable contact 10 contacts the pair of fixed contacts 11a and 11b, the switch 5 is turned on.

On the other hand, on the inner wall of the horn cover 2 attached to the back plate 1, as shown in FIGS. 2 and 5, there is a convex portion 2a that comes into contact with one end 6a of the case 6 of the switch 5 and restricts the movement of the case 6. is formed.

In the above configuration, the switch 5 and the sound unit 3 are connected to the security system main unit so that the sound unit 3 is activated to generate an alarm sound when the switch 5 is turned off, and the horn device is connected to the main unit of the security system. The plate 1 is attached so as to be in contact with the wall surface indicated by the dashed line B in FIG. In this case, the protrusion 9c of the switch 5 is pushed in the direction of the arrow A, so the switch 5 is in the on state.
Now, if a trespasser or the like forcibly removes the horn device together with the back plate 1 from the wall, the protrusion 9c will protrude, the switch 5 will be turned off, and the sound unit 3 will emit an alarm sound. Furthermore, if a trespasser or the like forcibly removes only the horn case 2 from the back plate 1, the protrusion 2a separates from one end 6a of the case 6 of the switch 5, causing the case 6 to move in the direction of arrow A. The protrusion 9c protrudes, the switch 5 turns off, and the sound unit 3 emits an alarm sound.

Note that if the sound unit 3 is also attached to the main unit side of the security system so that the alarm sound is emitted at the same time as the sound unit 3 in the horn case 2, the sound unit 3 in the horn case 2
The alarm will not stop sounding even if it is removed. Further, in the above-described embodiment, the normally open switch 5 was explained as an example, but the invention is not limited to this, and for example, the normally closed switch 5 as shown in FIG.
In addition, a switch as shown in FIGS. 7 to 10 may be used. 7 to 10, 20 is a case, 21 is a reed switch, 22 is a spring, 23a, 23b are permanent magnets, and 24a, 24b are movable members.

[Effect of idea]

As explained above, according to this invention, a guide hole is formed through the base, a convex portion is formed on the inner wall of the cover, and one end is slidably fitted into the guide hole. A switch means is provided which abuts the convex portion and whose other end protrudes from the rear surface of the base and opens and closes by a compressive force acting between the one end and the other end, so that the base and the cover can be opened and closed at the same time. Both the case where the cover has been removed or the case where only the cover has been removed can be detected by a single switch means, and therefore the horn device can be easily and inexpensively installed by illegal intruders. This has the effect of being able to detect illegal removal acts.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the configuration of a conventional horn device, Fig. 2 is a side sectional view showing the structure of a horn device according to an embodiment of the present invention, and Fig. 3 is a view taken from the direction of arrow C in Fig. 2. FIG. 4 is a cross-sectional view showing the configuration of the switch 5 in FIG. 2, and FIG. 5 is an inner surface of the horn cover 2 as seen from the direction of arrow D in FIG. 2. FIGS. 6, 7 and 9 are cross-sectional views showing other configuration examples of the switch 5 in FIG. 2, and FIGS. FIG. 10 is a perspective view showing the structure of the movable members 24a and 24b, and FIG. 10 is a perspective view showing the structure of the permanent magnet 23b in FIG. 1... Back plate (base), 1a... Square hole,
1b...Cylindrical part, 1c...Guide hole, 2...Horn cover (cover), 2a...Convex part, 3...Sounding unit, 5...Switch (switch means), 6...
...Case, 6a...One end, 9...Movable member, 9
c... Protrusion.

Claims (1)

[Scope of utility model registration request] A horn device including a sound generating unit housed in a base and a cover attached to the base, including a guide hole formed through the base and a convex formed on the inner wall of the cover. and a switch means slidably fitted into the guide hole, the switch means being telescopic and biased in the direction of extension by an elastic member;
One end of the horn device is in contact with the convex portion and the other end is in contact with the object to which the horn device is attached, so that the horn device is attached in a contracted state, and the switch is configured to be driven when transitioning from this state to an extended state. A horn device characterized by: