US3434418A

US3434418A - Jumping mine

Info

Publication number: US3434418A
Application number: US645829A
Authority: US
Inventors: Paul Madlener; Otto Pecksen
Original assignee: Industrie Werke Karlsruhe Ausburg AG
Current assignee: KUKA AG
Priority date: 1966-07-06
Filing date: 1967-06-13
Publication date: 1969-03-25
Anticipated expiration: 1986-03-25
Also published as: BE700785A; GB1167071A; SE332583B; CH474740A; DE1578156A1

Description

March 25, 1969 P, MADLENER ET AL 3,434,418

JUMPING MINE Filed June 13, 1967 United States Patent Int. c1. F42b 23/06 US. Cl. 102-8 5 Claims ABSTRACT OF THE DISCLOSURE A jumping mine is formed by an interior container filled with a hollow charge explosive body and arranged to be ejected from a buried exterior ejector pot. The upper end of the interior container is provided with a conical cap for penetrating and removing a camouflage layer which covers the buried mine. An annular magneto-igniter is fixed to the bottom of the interior container and is provided with a withdrawable core so as to produce a powerful ignition voltage when the interior container with the explosive body therein is ejected by a propellant charge of pressure gases from the ejector pot. The movable core of the magnet is attached to a trigger wire assuring a detonation of the explosive body at a predetermined distance above the surface of the ground.

The invention relates to a jumping mine provided with an exterior ejector pot from which an interior container is ejected by pressure gases, whereby the interior of the ejectable container is filled with an explosive charge.

The conventional jumping mines whose explosive charge detonates after the interior container has been ejected from the ejector pot at a predetermined height above the surface of the ground are not particularly suitable for fighting of tanks or armored vehicles because the explosive force of the explosive charge is not suflicient to penetrate the armored plate.

For this reason one employs hollow charge mines whose explosive charge has a high penetrating power. This high penetrating power which destroys the armored plate, however, is only obtained when sufficient explosive material is available, and therefore, one is compelled to produce relatively large hollow charge mines which are able to receive this rather substantial amount of explosive material. This has the result, of course, that the hollow charge mines will be relatively heavy and this is a very noticeable disadvantage when these mines are placed in the ground. It ha been proposed heretofore, in order to produce a camouflage placement of the mines which assures an undisturbed production of the hollow charge jet, whose penetrating power is not reduced by the camouflage layer, such as soil, stone and the like, to remove the camouflage layer resting on the hollow charge mine prior to the ignition of the hollow charge by a smaller explosive charge. Only after this smaller explosion of the charge which exposes the mine, a second detonator effects the detonation of the hollow charge. Since now the armored tank or the lower surface of the same is disposed about 40 cm. above the surface of the ground, a large amount of explosive is necessary to penetrate this armor. In addition a further disadvantage of this known arrangement is that the mentioned additional smaller explosive charge is required for removing the camouflage layer which has been placed on top of the mine.

All of these disadvantages and imperfections are overcome by the present invention, Whose object is to create a mine which requires a smaller amount of explosive maice terial than heretofore and which in addition thereto has smaller dimensions. This has the result that the mine of the invention compared with the conventional mines has a considerably smaller weight, so that the placement of the smaller mines is simpler and does not require excessive bodily efforts.

In accordance with the invention, the ejector pot of the mine is provided with an ejectable inner container which is formed as a hollow charge explosive body and is provided with a magneto-igniter disposed in a hollow space formed by a bottom plate which is fixedly connected with the magneto-igniter. The combination of a jumping mine and a hollow charge mine to form a hollow charge jumping mine has the great advantage that in spite of the smaller amount of explosive compared with the prior art the effect of the hollow charge against the armored tank is more intense than heretofore, whereby a small aperture produced in the bottom wall of the tank by the hollow charge has the result that a very substantial portion of the explosive charge is injected into the interior of the tank or the armored vehicle.

According to another object of the invention, the interior container is provided with a recess in its upper end and at the other end with a conical surface, whereby said recess is covered by a conically shaped protective cap. This conical shape of the protective cap which is arranged on the upper end of the mine which faces the ground surface has the result that during the jumping of the interior container from the ejector pot the camouflage layer drops downwardly along the inclined surfaces. In this manner a removal of the camouflage layer by detonation as heretofore practiced is no longer necessary, and therefore, the heretofore employed additional explosive charge used for this purpose can be dispensed with.

The invention is also characterized by a magnetoigniter which is constructed as an annular magnet provided with a withdrawable magnetic core which in turn is attached to a spirally wound trigger wire. The magnetoigniter is arranged within a cap attached to a plate attached to the bottom of the interior container, and this cap is engaged by a bottom dish which receives the trigger wire spirally wound in its inoperative position. The bottom dish is fixedly attached to the bottom of the ejector pot. The fact that the magneto-igniter is constructed as an annular magnet permits the construction of the igniter in a fiat shape, and this again has the advantage that the entire mine can be constructed with a minimum of height. After the ignition of a propelling charge, the developed powder gases eject the interior container constructed as a hollow charge explosive body from the ejector pot, whereby at the same time, for the purpose of producing the ignition voltage, the core of the magnet is pulled from the magneto-igniter by the trigger wire when it straightens out. In order to prevent that in view of the produced pressure the bottom dish in which the trigger wire is arranged is not also ejected, this bottom disc is attached to the bottom of the ejector pot with a special adhesive. In this manner it is assured that no troubles can develop, so that the trigger wire connected with the bottom cap will always pull the core from the magneto-igniter. As a result of the jump of the interior container from the ejector pot, the distance between the tank or the bottom of the armored vehicle and the hollow charge can be made small. Experiments will determine the most favorable distance for obtaining an optimum effect from the hollow charge of the explosive body, so that then the trigger wire has been made of a predetermined length, the hollow charge will always explode at the same distance from the armored tank.

For detonation of the hollow charge is employed an electrical ignitable detonator cap which is threadedly attached to the center of the lower end of the conically shaped face of the interior container in an extension of the core of the magnet of the magneto-igniter.

The drawing illustrates in:

FIG. 1 a vertical sectional view one embodiment of a jumping mine made in accordance with the present invention; and

FIG. 2 is a diagram of the ignition circuit.

Referring to the drawing, an ejector pot 1 circular in cross-section is provided with an ejectable interior container 2, the major portion of the side wall of which engages the inner surface of the circumferential wall of the ejector pot 1. The interior container 2 is constructed as a hollow charge explosive body C, and an upper conical recess 3 in the same is covered by a reversely conically shaped protective cap 4. A conical lining covers the hollow charge and by means of a marginal folding or beading operation the margins of the cap 4 and lining 5 are united with the upper circumferential margin of the inner container 2. The lower conical bottom wall 7 of the inner container 2 has attached thereto by a threaded connection an electrically ignitable primer cap 8 which is used for igniting the hollow charge C. The conical bot tom wall 7 has attached to its outer surface by means of spot welds 7a a cup-shaped plate member 9 to the lower plane face of which is secured a horizontal bottom plate 10 by means of bolts 10a. The outer edge of the plate 10 is provided with a downwardly extending annular flange 11 which forms in the lowermost portion of the pot 1 a hollow chamber 12 in which is disposed a magneto-igniter. Below the latter is arranged a spirally wound trigger wire 13. The bolts 10a at the same time attach a cap 14 to the plate 10. This cap 14 contains the magneto-igniter which latter comprises a permanent annular magnet 15 and a pole-plate 16. In the center of this magneto-

igniter

15, 16 is arranged an axially movable core 17 around which is placed an ignition coil 18, the ends of which are connected by suitable conductors 17a, 1711 with an incandescent exploder 29 in the primer cap 8. The lower end of the core 17 has a centrally disposed projection 19 with a transverse hole 19a therethrough in which one end of the trigger wire 13 is secured. A bottom dish 21 with an upwardly extending marginal flange 20 and in which the trigger wire 13 is placed is pressed against the bottom face of the cap 14 and as a result of the beading of the upper marginal edge of the interior container is also pressed against the bottom 22 of the ejector pot 1. As a result of this construction, the bottom dish 21 will engage the bottom of the ejector pot. In addition, the bottom dish 21 is fastened to the bottom 22 of the ejector pot 1 by means of a special adhesive in order that the core 17 of the magnet is pulled by the trigger wire 13 from the closed magneto-igniter during the firing of the hollow charge explosive body. The other end of the trigger wire 13 is fixedly secured to the inner bottom wall of the dish 21.

An interiorly threaded nipple 23 is welded at 23' to the lower end of the upright wall of the ejector pot 1. The bore of this nipple 23 permits the insertion of the propellant charge 24 which comes to lie between the bottom of the hollow charge explosive body and the bottom 22 of the ejector pot 1. The threaded nipple 23 is closed in a waterproof manner by a threaded plug 26 which is removed for the reception of a not illustrated igniter.

The operation of the jumping mine is as follows:

The hollow charge jumping mine is buried a predetermined depth into the ground and is camouflaged. Previously, however, the closure plug 26 in the nipple is removed and the igniter is inserted which responds to predetermined loads or contact elements on its transverse surface. Upon ignition of the propellant charge 24, the powder gases exert upon the bottom plate 10 of the inner container 2 such a pressure that the container 2 is separated at the beaded fold 27 from the ejector pot 1 and is propelled upwardly and jumps from the ground, whereby at the same time the magneto-igniter is actuated by the straightened trigger wire 13 and operates the core 17 of the magnet. When the core is pulled from the magneto-igniter, the closed magnetic field collapses, so that the magnetic flux lines intersect perpendicularly the windings of the ignition coil 18 and produce an ignition voltage. As a result, the electrically ignitable blasting cap 8 receives a powerful ignition impulse which causes an ignition of the interior container 2 formed as hollow charge explosive body at a predetermined distance above the surface of the ground below the underside of the tank or below the armored vehicle.

What we claim is:

1. A jumping mine comprising an exterior ejector pot, an ejectable interior container in said pot, an explosive charge formed as a hollow charge explosive body in said ejectable container, means forming a chamber in the lower portion of said ejector pot, and a magneto-igniter disposed in said chamber and attached fixedly to the lower portion of said ejectable container and adapted to ignite the explosive body therein, said megneto-igniter including an annular magnet fixedly connected with said ejectable interior container, and a withdrawable core in the center thereof, a flexible trigger wire attached with one of its ends to said core of said magneto-igniter and with its other end to said exterior ejector pot and means in the chamber for ejecting said ejectable interior container to thereby actuate the magneto-igniter..

2. A jumping mine according to claim 1, including a horizontal bottom plate attached to the lower end of said ejectable interior container, a cap attached to the lower face of said bottom plate, said cap containing said annular magnet of said magneto-igniter and an ignition coil within said annular magnet, said ignition coil surrounding said withdrawal core, and a flanged bottom dish fixedly attached to the bottom of said ejector pot and forming a space below said cap for receiving said trigger wire whose one end is attached to the lower end of said core while the other end of said wire is attached to said flanged bottom dish.

3. A jumping mine according to claim 2, in which said annular magnet is provided with a pole plate which is urged in engagement with the lower face of said annular magnet by said cap which also urges the upper face of said annular magnet against the lower face of said horizontal bottom plate of said ejectable interior container.

4. A jumping mine according to claim 2, in which said horizontal bottom plate of said ejectable interior container is provided with a downwardly extending annular flange which engages the inner wall of said exterior ejector pot, while the lower edge of said annular flange engages the bottom wall of said ejector pot thereby forming a closed chamber in the lower part of said pot, and said ejection means being a propellant charge extending from the exterior of said pot into said closed chamber, which chamber also contains said magneto-igniter extending downwardly from said horizontal bottom plate.

5. A jumping mine according to claim 1, in which said trigger wire has a predetermined length and causes a withdrawal of said core from said annular magnet and an ignition of said explosive body in said ejectable container after the latter has been ejected a predetermined distance from said exterior ejector pot.

References Cited UNITED STATES PATENTS 2,830,538 4/1958 Dodge 1028 3,035,520 5/1962 Koeppen 10270.2 3,229,582 1/1966 Schlie 10270.2

SAMUEL W. ENGLE, Primary Examiner.

US. C .Xls-

tog-19.2, 70.2,