JPH0353343Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention detects a wire stretched in a security area, a movable part connected to the tip of the wire and displaced according to the tension of the wire, and the movement of the movable part. The present invention relates to a tension detection type alarm device having a tension detector having a detection section that generates a detection signal.

[Prior art]

The tension detection type alarm device described above has advantages such as low cost, easy installation work, and relatively stable operation, so it is widely used for guarding the outer periphery of factories, warehouses, and various plants. It is used. For example, referring to FIG. 2, the tension detector 3 is attached to the pillar 2 of the fence 1, and the tension detector 3
Either stretch the wire 4 between them and run the detection signal output line from the detection section along the wire 4, or use the wire as a conducting wire and also use it as the detection signal output line, or pull it out by a completely different route from the wire. For example, the system guides the user to a security guard's room and displays an alarm.

In such a warning device, when an intruder climbs over the fence 1, the intruder connects to the wire 4.
When the tension detector 3 comes into contact with the tension detector 3, the tension detector 3 is activated and generates a detection signal, so that an alarm is displayed.

By the way, this warning device has the disadvantage that it will issue an alarm even if tension is applied to the wire by something other than an intruder, such as wind, tree branches, birds, etc., so when installing it, be sure to check the surrounding conditions. It is common to adjust the sensitivity of each tension detector. However, since it is rare that the entire surrounding situation is known at the time of installation, if false alarms occur repeatedly after installation, it is often necessary to readjust or replace the tension detector. A similar situation also occurs due to changes in sensitivity due to use.

[Problems with conventional technology]

As shown in Figure 2, such alarm devices often use a number of tension detectors connected in series, so in order to replace or readjust the above, it is necessary to determine which detector is causing the false alarm. I need to know if it will occur.

If there is an alarm, it is normal for security guards to rush to the restricted area, so if the alarm continues to be issued, it is possible to know which tension detector is operating, but in the case of a false alarm, Generally, the cause of the problem is usually gone by the time security guards arrive. Therefore, it is very difficult to find a tension detector that requires readjustment or replacement.

[Purpose of invention]

In view of the above, an object of the present invention is to provide a tension detection type alarm device that makes it easy to know which tension detectors are likely to generate false alarms when installed.

[Structure of the idea]

The present invention is a tension detector that has a wire stretched in a guarded area, a movable part that is connected to the tip of the wire and is displaced by the tension applied to the wire, and a detection part that detects movement of the movable part and generates a detection signal. A tension detection type alarm device comprising: a moving member provided so that the tension detector follows the displacement of the movable part; a stopping mechanism that stops the moving member at the position where the movable part is moved; The tension detection type alarm device is characterized in that it has a display section that displays that the movable member is at a position where it is stopped by the above-mentioned stopping mechanism.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the tension detector 3 is connected to the case 31.
, a magnet 32 as a movable part provided movably within this case 31, and this magnet 32.
The tip of the wire 4 is connected to a magnet 32, and the magnet 32 is connected to the opposite end of the wire by a spring 34 for applying a predetermined tension to the wire 4. being pushed in the direction.

The structure described above is the structure of a tension detector in a known state. When tension is applied to the wire 4 in the state shown in FIG. be pulled and moved. As a result, the reed switch 33 generates an output in response to the displacement of the magnet 32. Thereafter, when the tension on the wire 4 is relaxed, the restoring force of the spring 34 causes the magnet 32 to return to its original position as shown in FIG. 1c.

According to the present invention, the detector 3 shown in FIG. 1 has a mechanism for storing and displaying the displacement of the movable magnet 32 to the outside, and a mechanism for releasing the displacement.

That is, a ratchet plate 35 is provided within the case 31 as a moving member movable in the moving direction of the magnet, and its rear end engages with the magnet 32. The ratchet plate 35 is operated by a compression spring 36 disposed at the front.
It is pressed toward the magnet 35. A protruding rod 37 is provided in front of the ratchet plate 35, which serves both as a guide and support for the compression spring 36 and as a display rod. An arm 38 having a pawl 381 that engages with the teeth of the ratchet plate 35 is pivotally supported within the case 31, and a spring is attached to the arm 38 so as to force the pawl 381 into resilient engagement with the teeth of the ratchet plate 35. 39 is at work. The engagement of the pawl 381 with the teeth of the ratchet plate 35 is such that it allows the ratchet plate 35 to move forward but prevents it from moving backward. The rear end of the arm 38 projects outside the case.

With the above configuration, when tension is applied to the wire 4 from the state shown in FIG. 1a and the magnet 32 moves as shown in FIG. 1b, the ratchet plate 35 simultaneously moves.
follows and moves. At this time, the protruding rod 37 protrudes outside the case, indicating that the detector 3 has operated. Next, the tension in the wire 4 is relaxed, and the magnet 3
2 returns to its original position, the teeth of the ratchet plate 35 engage with the claws 381 of the arm 38, preventing the ratchet plate 35 from returning. Therefore, the ratchet plate 35 is stopped at the position moved together with the displacement of the magnet 32, and this position is memorized.

Therefore, once the detector 3 operates under the tension of the arm 4, that operation is memorized by the movement and stop of the ratchet plate 35. Even if the tension on the wire is loosened afterwards, the display rod 37 can be observed from the outside. By doing this, you can find out which detector is activated.

Note that by pushing up the protruding end of the arm 38 in the state shown in FIG. do.

Above, the present invention has been described with respect to an example in which a stop mechanism and a release mechanism of a specific structure are provided for a detector with a specific structure, but the present invention is not limited to this example. This can be realized by adding various stop mechanisms and release mechanisms to various tension detectors.

[Effect of idea]

According to the present invention, once the movable part is displaced by the tension applied to the wire, the movable member is displaced together with it, and this is a stopping mechanism that maintains the displaced state and displays this externally. , the operating detector can be easily known from the outside. Therefore, it is possible to easily know which detectors are likely to malfunction, and there is an advantage that readjustment and replacement can be easily performed.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, in which Fig. a is a cross-sectional view showing the state before operation, Fig. b is a cross-sectional view showing the state after operation, and Fig. c is the state after the wire tension is relaxed. FIG. 2 is a diagram showing an installation example of a tension detection type alarm device. 3...Tension detector, 4...Wire, 32...Magnet (movable part), 33...Reed switch (detection part), 35...Ratchet plate (movable member),
371...Claw (stopping mechanism), 39...Display rod.

Claims (1)

[Scope of utility model registration request] A tension detector includes a wire stretched in a guarded area, a movable part connected to the tip of the wire and displaced by tension applied to the wire, and a detection part that detects movement of the movable part and generates a detection signal. In the tension detection type alarm device, the tension detector includes a moving member provided so that the tension detector follows the displacement of the movable part, a stopping mechanism that stops the moving member at the position where the movable part is moved, and the moving member A tension detection type alarm device comprising: a display section that displays that the device is at a position stopped by the stopping mechanism.