Ammunition and explosives – Igniting devices and systems – Electrical primer or ignitor
Reexamination Certificate
1999-06-24
2001-11-20
Nelson, Peter A. (Department: 3641)
Ammunition and explosives
Igniting devices and systems
Electrical primer or ignitor
C102S472000, C102S495000, C102S497000
Reexamination Certificate
active
06318268
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a demolishing apparatus using discharge impulse for demolishing an object to be demolished, such as concrete or rock mass, by using discharge energy.
BACKGROUND ART
So far, dynamite has been known as demolishing means for demolishing an object to be demolished such as concrete or rock mass, however, a danger is involved in handling the dynamite.
A demolishing apparatus using discharge impulse, which uses discharge energy, has been proposed in recent years as a way of eliminating such danger.
This demolishing apparatus using discharge impulse comprises a pair of electrodes connected to each other by means of a metal wire, and an energy supply circuit being connected to these electrodes and adapted to supply electrical energy to the metal wire, wherein the metal wire is immersed in a demolishing material (a liquid such as water or a semisolid material is used) filled in a demolishing container (hereinafter referred to simply as “container”).
Next, the demolishing method for the aforementioned demolishing apparatus using discharge impulse will be explained. According to the method, the metal wire is immersed in the container filled with a demolishing material, the demolishing container is installed in an installation hole formed in an object to be demolished, the supply circuit is connected to the electrodes, a capacitor installed in this supply circuit is charged with a prescribed quantity of electrical energy, and this electrical energy is supplied to the metal wire for a short time (for example, several dozen &mgr;s), that is in other words, electric power is discharged. Whereupon, the metal wire suddenly melts and vaporizes and expands in volume. Following this, the demolishing material also suddenly vaporizes and expands. The volume expansion force of the metal wire is transmitted by this demolishing material, and the sudden volume expansion force of the metal wire and the vaporization and expansion force of the demolishing material act on the walls of the installation hole, for example, in such a manner that the installation hole is pressed outward, thereby demolishing the object to be demolished.
However, with the aforementioned demolishing apparatus, the vaporization and expansion force of the demolishing material filled in the container is used to demolish an object to be demolished, so that resultant physical force such as a shock force cannot be sufficient. Therefore, there are such cases, depending on the kind of object to be demolished, that sufficient demolishing force cannot be obtained, and because of this, further improvement of the demolishing force is desired.
It is an object of the present invention to provide a demolishing apparatus using discharge impulse which is capable of resolving the foregoing problems.
DISCLOSURE OF THE INVENTION
The present invention is a demolishing apparatus using discharge impulse in which electrical energy is supplied for a short time to a melting and vaporizing material (for example, a metal wire is used) placed in a container so as to cause the melting and vaporizing material to suddenly melt and vaporize, thereby demolishing an object to be demolished; wherein a container is filled with a demolishing material which vaporizes and expands following the melting and vaporizing of the melting and vaporizing material, and a granular material (metal balls, pebbles, ceramic balls or the like are used) which transmits a direct force to the surroundings by a volume expansion force generated when the melting and vaporizing material melts and vaporizes.
According to this invention, the melting and vaporizing material melts and vaporizes as the electrical energy is supplied to the melting and vaporizing material; the demolishing material vaporizes and expands following the melting and vaporizing of the melting and vaporizing material; the volume expansion force of the melting and vaporizing material is transmitted to the object to be demolished; and the volume expansion force generated during the melting and vaporization of the melting and vaporizing material causes the granular material to give a shock to the object to be demolished, thereby demolishing the object without fail.
Also, the present invention is a demolishing apparatus using discharge impulse which is constituted to supply electrical energy for a short time to a melting and vaporizing material placed in a container so as to cause the melting and vaporizing material to suddenly vaporize and melt, thereby demolishing an object to be demolished; wherein the container is filled with a demolishing material which vaporizes and expands following the melting and vaporization of the melting and vaporizing material, and a granular material which transmits to the surroundings a volume expansion force generated when the melting and vaporizing material melts and vaporizes and a direct shock force; wherein a synthetic resin or paper, or a metal pipe, is used as a material constituting the container; and wherein a cylindrical holding body made of a hard material and having an opening at least at one end thereof is provided in the container such that the container faces the object to be demolished.
According to this constitution of the invention, the melting and vaporizing material melts and vaporizes as the electrical energy is supplied to the melting and vaporizing material; the demolishing material vaporizes and expands following the melting and vaporizing of the melting and vaporizing material; the volume expansion force of the melting and vaporizing material is transmitted to the object to be demolished; and the granular material is ejected from the opening at one end of the cylindrical holding body toward the object to be demolished by the volume expansion force generated during the melting and vaporization of the melting and vaporizing material, thereby demolishing the object to be demolished reliably with the strong demolishing force.
Also, the present invention is a demolishing apparatus using discharge impulse which is constituted to supply electrical energy for a short time to melting and vaporizing material placed in a cylindrical container so as to cause the melting and vaporizing material to suddenly melt and vaporize, thereby demolishing an object to be demolished; wherein the cylindrical container is filled with a demolishing material which vaporizes and expands following the melting and vaporization of the melting and vaporizing material, and a granular material which transmits to the surroundings a volume expansion force generated when the melting and vaporizing material melts and vaporizes; and wherein the cylindrical container is made of a hard material and includes a soft stopper element provided at an opening at one end of the cylindrical container.
According to this constitution of the invention, the melting and vaporizing material melts and vaporizes as the electrical energy is supplied to the melting and vaporizing material; the demolishing material vaporizes and expands following the melting and vaporizing of the melting and vaporizing material; the volume expansion force of the melting and vaporizing material is transmitted to the object to be demolished; and the granular material is caused to break the stopper element from the opening at one end of the cylindrical holding body so as to be ejected toward the object to be demolished, by the volume expansion force generated during the melting and vaporization of the melting and vaporizing material, thereby demolishing the object to be demolished reliably with the strong demolishing force.
Also, the present invention is a demolishing apparatus using discharge impulse which is constituted to supply electrical energy for a short time to melting and vaporizing material placed in a cylindrical container so as to cause the melting and vaporizing material to suddenly melt and vaporize, thereby demolishing an object to be demolished; wherein the cylindrical container is filled with a demolishing material which vaporizes and expands following the melting and vaporization
Arai Hiroaki
Inoue Tetsuya
Kato Tsuyoshi
Maehata Hidehiko
Sasaki Katsuya
Hitachi Zosen Corporation
Hochberg D. Peter
Holt William H.
Nelson Peter A.
Vieyra Katherine R.
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