JP2000123695A - Emergency power source cutoff tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disconnect an electric wire laid on a hitting stand to surely cut off a power source by constituting a blade and the hitting stand to which a thrust is applied by the explosion of explosive filled in a cylinder with an insulating material coated metal. SOLUTION: In the emergency power source cutoff tool, when current based on an alarm signal is carried to a blasting cap 8, explosive 2 is exploded, a piston 10 is pushed, a blade 3 is pushed down, cuts an electric wire 4, strikes against a hitting stand 5 and stops. Since the blade 3 and the stand 5 are made of steel having insulating coating 6 of ceramic, cutting quality and strength of the cutter 3 are not damaged, and the blade 3 interposed between the electric wires 4 existing after cutting insulates electricity. Even if a burr is produced at a cut end of the electric wire 4 and touched with the stand 5, insulation is kept with the insulating coating 6 of the stand 5. Since the blade 3 and the stand 5 are insulated and strong, even a stiff and thick electric wire 5 can be cut, and the cut electric wire 4 is surely insulated. A secondary accident caused by an electric power can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cut-off device for instantly disconnecting a wiring cable from a power supply in an emergency such as an accident or disaster.

[0002]

2. Description of the Related Art When a disaster or accident occurs at a place where power is used in some way, such as a house, a meeting place, a factory, a car, or even a rocket, a secondary disaster such as a fire or an electric shock occurs due to the power supply. There is a danger of doing. In order to prevent such a secondary disaster, it is necessary to shut off the power supply instantaneously.

[0003] Conventionally, there has been known an apparatus for cutting a power cable by a blade provided with a thrust by a spring or an explosive in order to prevent the spread of the power cable or the like in a fire. For example, Japanese Patent Laying-Open No. 62-247718 discloses a configuration in which a piston is moved by an explosive and a cable bundle is cut by a metal blade (blade) attached thereto. Since this device prevents the spread of the power cable itself, it is not assumed that the power cable is energized, and even if the power cable is energized, the metal body (knife) is cut off. Even if it is interposed between the cut ends of the power cable, it is possible to achieve the original purpose of preventing the spread of fire. However, since the blade is metal, the power cable is energized even after cutting, and the power cannot be cut off.

On the other hand, as a cutter for cutting a current-carrying electric wire, Japanese Patent Application Laid-Open No. 63-216616 describes a cutter utilizing the fact that ceramics is nonconductive. Since this ceramic cutter is premised on cutting a relatively thin electric wire, it is illustrated as having a staggered structure, and it is possible to cut even a brittle material such as ceramic. However, a brittle ceramic cutter cannot be used for cutting a rigid and thick power cable bundle as described in JP-A-62-247718.

[0005]

The present invention describes that the power cable is instantaneously cut off and the power supply is cut off in order to prevent a secondary disaster such as fire or electric shock caused by the power supply. The purpose of the present invention is to provide an emergency power-off device to achieve the purpose.

[0006]

According to an embodiment of the present invention, there is provided an emergency power cut-off device for achieving the above-mentioned object, as shown in FIG. The blade 3 to which the thrust is given by the explosion is an emergency power cut-off device for cutting the electric wire 4 lying on the hitting table 5, and the blade 3 and the hitting table 5 are made of a material having an insulating coating 6 on metal. .

Further, the cylinder 1 may be made of a material obtained by coating a metal with an insulating coating. The material of the insulating coating 6 is preferably ceramic.

The emergency power cut-off device of the present invention is robust because the blade 3 and the hitting table 5 are made of a material in which an insulating coating 6 is formed on a metal. Therefore, even a thick wire having rigidity that can be cut by the thrust of the explosive 2 can be cut without being damaged, and the blade 3 is interposed between the cut wires (see the chain line in FIG. 1), so that the power supply can be reliably performed. Can be shut off.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an emergency power cutoff device to which the present invention is applied. As shown in the figure, the emergency power cut-off device is provided with a hole in the cylinder 1 through which the electric wire 4 to be cut passes. The upper end of the cylinder 1 is screwed with a cap 7 via a metal O-ring 9.
And a primer 8 is hermetically inserted through a cap 7. A piston 10 is inserted into the cylinder 1, and a blade 3 is attached to the electric wire 4 side of the piston 10. On the other side of the blade 3 via the electric wire 4,
A driving table (anvil) 5 is fitted into the cylinder 1.

The blade 3 is made of a steel material and is coated with a ceramic coating 6 so as to be insulative. The driving table 5 is also made of steel, and has a coating 6 made of ceramic on the upper surface with which the electric wire 4 contacts.

[0011] This emergency power cut-off device is a wiring branch that avoids the emergency power distribution wiring, just before entering the indoor wiring, before and after the distribution board, or in a building such as a house or a factory that receives power from an external power supply. Is located near. In a device equipped with a battery power supply such as an automobile or a rocket, the device is disposed near a terminal of the battery. Emergency power cutoff primer 8
Is connected to a device that generates a signal when the power needs to be shut off urgently. For example, when it is placed in a house or a factory, it is connected to a power supply controlled by a warning signal of a fire alarm or an earthquake alarm. In the emergency power cut-off device arranged in the automobile, the primer 8 is connected to a power source controlled by the signal of the collision sensor.

With this emergency power cut-off device, when a current derived from a warning signal flows through the primer 8, the explosive 2 explodes and the piston 10
Is pressed, the blade 3 is knocked down and cuts the electric wire 4,
It hits the hitting table 5 and stops. At this time, since the blade 3 and the hitting table 5 are coated with a ceramic coating 6 on steel, the sharpness and strength of the blade are not impaired, and the blade 3 interposed between the cut electric wires 4 insulates electricity. . Even if the cut of the electric wire 4 is burred and comes into contact with the table 5, the insulation is maintained by the ceramic coating 6 of the table 5.

As a preferred specific example of the insulating ceramic coating, a material having a large specific resistance and a high hardness, such as alumina, zirconia, veria, magnesia, and boron nitride, can be used.

The results of confirming the performance of a prototype of the emergency power cutoff device of the embodiment are shown below. The blade 3 and the hitting table 5 are each made of a steel material coated with 0.05 mm of alumina ceramic. The electric wire cable of the sample to be cut has a diameter of 0.8 mm and a core wire of 0.55 mm wound with 30 pieces of aluminum tape. In order to determine the amount of explosive 2, a blade coated with alumina ceramic was attached to the compression tester in the same manner as above, and the same electric cable as the sample was set at the tip of the blade. This force was converted to the amount of explosive to be obtained with the blade 3 of the emergency power cutoff device, and the cylinder 1 was filled with 100 mg of the explosive 2 with a margin. The electric wire cable of the sample was inserted into the emergency power cutoff as the electric wire 4, and when a current was applied to the primer 8, the explosive 2 exploded and the electric wire cable was instantly cut by the blade 3. While maintaining the state after cutting, complete electrical insulation was obtained before and after the cable.

[0015]

As described in detail above, the emergency power cut-off device of the present invention can cut even a rigid and thick electric wire because the blade and the struts are insulative and strong. Can be reliably insulated from each other. Therefore, when a disaster or accident occurs in a place where the power supply wiring is present, the current from the power supply can be reliably shut off, so that a secondary disaster caused by the power supply can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of an emergency power cutoff device to which the present invention is applied.

[Explanation of symbols]

1 is a cylinder, 2 is an explosive, 3 is a blade, 4 is an electric wire, 5 is a hitting table, 6 is an insulating coating, 7 is a cap, 8 is a primer, 9 is a metal O-ring, and 10 is a piston.

Claims (3)

[Claims] 1. An emergency power cut-off device for cutting an electric wire lying on a hitting plate, wherein the blade and the hitting plate are provided with an insulative coating on a metal. An emergency power cut-off device characterized by being made of a material which has been subjected to the following. 2. The emergency power cut-off device according to claim 1, wherein said tube is made of a material obtained by coating a metal with an insulating coating. 3. The emergency power cut-off device according to claim 1, wherein the material of the insulating coating is ceramics.