JPH0762413B2 - Barbed fence - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barbed wire fence.

[0002]

2. Description of the Related Art A barbed wire fence is a simple fence in which barbed wire is stretched between columns to form a fence and has been used for a long time. The barbed wire is formed by twisting two iron wires together to form a wire rod, and one of the iron wires is a short wire whose both ends are sharpened at appropriate intervals as a stab member to be wound around the center thereof and attached. The member is made by sandwiching and holding two iron wires between the twisted parts. Most of the columns are made of wood or metal, and the barbed wire is stretched over columns that are erected at appropriate intervals.

When such a barbed wire fence is installed in a place where a lot of radio waves for communication are used, such as an airfield, since many of its constituent members are made of metal, there is a risk of radio wave interference. In particular, the barbed wire itself is stretched around for a long time, and it is likely to cause a failure.

Therefore, Japanese Patent Application Laid-Open No. 55-142876 (Japanese Patent Application No.
-51117), a fence made of fiber reinforced plastic is proposed as a fence fence component such as a pillar, a crosspiece, and a net. It is also described that the barbed wire made of synthetic resin in which the FRP piercing material is fixed by an adhesive is inserted into the FRP wire rod in advance and arranged at predetermined positions.

[0005]

As described above, also in the barbed wire fence, if all the columns and the barbed wire are made of synthetic resin, the fence will not be permanently rusted and will not be a factor of radio interference or lightning strike. Is obtained. However, there is no protection against illegal trespassers who break the barbed wire and enter.

An object of the present invention is to provide a barbed fence in which the disadvantages of the above-mentioned conventional example are eliminated, the influence of radio interference is reduced, and an alarm current can be flown so that illegal intrusion can be sufficiently dealt with. Especially.

[0007]

In order to achieve the above object, the present invention provides a non-conductive synthetic resin along a longitudinal direction of a wire material in which a metal conductive wire serving as a core wire is coated with a non-conductive synthetic resin. A current that activates an alarm when barbed wires are formed by attaching piercing members at appropriate intervals, and the barbed wire is stretched between non-conductive synthetic resin struts and the core wire of the barbed wire is cut off. Or by attaching non-conductive synthetic resin piercing members to the synthetic resin optical fiber cable along the longitudinal direction at appropriate intervals to form a barbed wire. The main point is to provide an optical signal that is installed between the optical fiber cables and activates an alarm when the optical fiber cable is cut off.

[0008]

According to the present invention as set forth in claim 1, a current for triggering an alarm can be applied to the core wire made of a metal conductive wire of the wire material forming the barbed wire, and the barbed wire is broken. In this case, the current flowing through the core wire is also cut off, so that an alarm can be activated to notify that fact. In addition, this core wire is a conductive wire made of metal, but is coated with a non-conductive synthetic resin, the metal part is not exposed to the outside, and other members, barb members forming the barbed wire and columns are also non-conductive. Since it is made of conductive synthetic resin, the influence of radio wave interference can be reduced.

According to the second aspect of the present invention, an optical signal that activates an alarm can be sent to the optical fiber cable when the optical fiber cable is cut off, and when the barbed wire is broken, the optical signal that is also sent to the optical fiber cable is also provided. Since it is cut off, an alarm can be activated to notify that fact. In addition, it does not cause radio wave interference or lightning strike.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a front view showing a first embodiment of a barbed wire fence according to the present invention. In the figure, 1 is a pillar, and 2 is a barbed wire stretched on a pillar 1 standing upright at appropriate intervals.

The barbed wire 2 will be described first with reference to FIG.
As shown in FIG. 3, the piercing members 4 are attached at appropriate intervals along the longitudinal direction of the wire rod 3. The wire rod 3 has a metal conductive wire as a core wire 5, and the core wire 5 is coated with a non-conductive synthetic resin. It is a covered electric wire subjected to 6. The core wire 5 is preferably made of mild steel, stainless steel, copper or the like, and as the non-conductive synthetic resin coating 6, PVC, polyethylene, 6N nylon,
Teflon etc. can be selected. Among them, if mild steel is used as the core wire 5, workability, workability, and economic efficiency are excellent, and if PVC is used as the synthetic resin coating 6, weather resistance and economic efficiency are advantageous.

As shown in FIG. 5, the barb member 4 has the wire 3
A rectangular base 7 having through holes 19 through which the
As shown in FIG. 3 and FIG. 4, the halves 4a, 4a having the same shape in which quadrangular pyramid-shaped stabs 8 are integrally projected from the left and right sides in the same direction at appropriate angles are provided in the directions orthogonal to each other. Will be combined in a cross.

These halves 4a, 4a are molded of a non-conductive hard synthetic resin, and of the upper and lower surfaces of the base portion 7 in which the through hole 19 is opened, which is opposite to the side on which the stab 8 stands. The fitting concavo-convex portion 9 was formed on the surface so that the protrusions of the fitting concavo-convex portion 9 fit into the recesses of the mating parts of the half bodies 4a.

Since the through-holes 19 are aligned with each other in the halves 4a which are joined together in a cross shape to form the piercing member 4, the wire 3 is inserted therein. In this way, the barbs 4 are attached to the wire 3 at appropriate intervals along the longitudinal direction to form the barbed wire 2.

On the other hand, the column 1 is made of fiber reinforced plastic (F
RP) is a pipe-shaped member made of a non-conductive synthetic resin such as RP).
Then, although not shown in the drawing, an appropriate number of them are arranged at appropriate intervals according to the construction distance.

The barbed wire 2 forms a barbed wire fence by tensioning a plurality of steps between the columns 1 with a vertical interval.

In such a barbed wire fence, the barbed wire 2
An electric current that activates an alarm is sent to the core wire 5 of the wire 3 when the wire is cut off. FIG. 6 shows an example of such a current circuit. Each barbed wire 2 is incorporated into one side of the bridge circuit 11 together with the other three resistors 12, 13 and 14 via lead wires connected to both ends of the core wire 5. The bridge circuit 11 is connected to the comparison circuit 15 to which the output is applied, and the output side of the comparison circuit 15 is connected to the alarm device 16. In the figure, 17 is a power source, but for this, a new type of condenser that can generate instantaneous power by concentrating weak electric power by combining a current collector, activated carbon, and dilute sulfuric acid can be used. Combinations are possible.

When a copper wire is used for the core wire 5, the barbed wire 2
It is possible that it is too soft and unsuitable. If mild steel is used as the core wire 5, this is not the case, but since it cannot be formed into a coil shape, it is transported and attached in a straight line of an appropriate length. Then, as shown in FIG. 6, the barbed wires 2 are connected to each other by connecting the ends of the core wires 5 with a connector 18 to make them long.

Next, usage and operation will be described. Normally, the barbed wire 2 is incorporated into the bridge circuit 11 with the resistance value of the core wire 5, the output voltage generated from the two terminals of the bridge circuit 11 maintains an appropriate value, and the comparison circuit 15
No more output.

Further, the core wire 5 is a conductive wire made of metal, but is coated with a non-conductive synthetic resin coating 6, so that the metal portion is not exposed to the outside, and other members and the barb constituting the barbed wire 2 are provided. Since the member 4 and the pillar 1 are also made of non-conductive synthetic resin,
The entire fence does not cause radio interference or lightning strike.

On the other hand, if the barbed wire 2 is broken by an illegal intruder, the core wire 5 is naturally cut, and the bridge circuit 11 loses its balance to generate an output, and the alarm 16
Drive to generate an alarm.

FIG. 7 shows a second embodiment of the present invention.
An optical fiber cable 20 is used in place of the wire 3 of the first embodiment, and non-conductive synthetic resin stick members 4 are attached along the longitudinal direction of the optical fiber cable 20 at appropriate intervals to form the barbed wire 2. .

As in FIG. 1, the barbed wire 2 is stretched between the non-conductive synthetic resin columns 1 and the optical fiber cable 20 of the barbed wire 2 is provided with an optical signal for activating an alarm when cut off.

When an illegal intruder breaks the optical fiber cable 20 constituting the barbed wire 2, the optical signal is cut off and the alarm 16 is driven to generate an alarm.

[0025]

As described above, the barbed wire fence of the present invention does not become a factor of radio interference, and moreover, it can flow an alarm current or an optical signal for alarm to prevent illegal intrusion. Can be dealt with sufficiently.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a barbed wire fence according to the present invention.

FIG. 2 is a front view in which a barbed wire portion is partially cut away.

FIG. 3 is a front view of a piercing member portion.

FIG. 4 is a side view of a piercing member portion.

FIG. 5 is a perspective view of a half of a pricking member.

FIG. 6 is a circuit diagram.

FIG. 7 is a partially cutaway front view of a barbed wire portion in a second embodiment of the barbed wire fence according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Strut 2 ... Barbed wire 3 ... Wire material 4 ... Piercing member 4a ... Half body 5 ... Core wire 6 ... Synthetic resin coating 7 ... Base portion 8 ... Stab piece 9 ... Uneven portion for fitting 10 ... Basic concrete 11 ... Bridge circuit 12 , 13, 14 ... Resistor 15 ... Comparison circuit 16 ... Alarm device 17 ... Power supply 18 ... Connector 19 ... Through hole 20 ... Optical fiber cable

Claims (2)

[Claims] 1. A barbed wire is constructed by attaching non-conductive synthetic resin piercing members at appropriate intervals along a longitudinal direction of a wire material in which a non-conductive synthetic resin coating is applied to a metal conductive wire to be a core wire. , Stretch this barbed wire between non-conductive synthetic resin columns,
A barbed wire fence, characterized in that a current is supplied to the core wire of the barbed wire to activate an alarm when the wire is cut off. 2. A barbed wire is formed by attaching non-conductive synthetic resin piercing members to a synthetic resin optical fiber cable at appropriate intervals along the longitudinal direction, and the barbed wire is made of non-conductive synthetic resin struts. A barbed fence that is stretched between the optical fiber cables and emits an optical signal that activates an alarm when it is cut off.