US3899977A - Demolition charges - Google Patents

Demolition charges Download PDF

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Publication number
US3899977A
US3899977A US424742A US42474273A US3899977A US 3899977 A US3899977 A US 3899977A US 424742 A US424742 A US 424742A US 42474273 A US42474273 A US 42474273A US 3899977 A US3899977 A US 3899977A
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United States
Prior art keywords
charge
ignition
charges
dovetail
fuse
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Expired - Lifetime
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US424742A
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English (en)
Inventor
Alois Schiessl
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Buck KG
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Buck KG
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/02—Blasting cartridges, i.e. case and explosive adapted to be united into assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition

Definitions

  • a demolition charge suitable for the destruction of Dec. 14. 1972 Germany 22 122 telecommunication equipment includes a housing containing an alumino-thermic mixture.
  • the housing has a [521 US. Cl. 102/90; 102/6; 102/66 plurality of ignition transmission openings and slid- [51] Int. Cl. F42b 11/24; F421) 13/14 ingly engageable coupling means for attaching other 1 1 Field Of Search 102/90, 8 demolition devices such as a fuse or additional charges.
  • the charge has foil coverings across the openings and may include internal interconnectors ex- [56] References Cited tending between selected openings.
  • a charge may be UNITED STATES PATENTS coupled to a fuse or to other charges such that ignition 224L486 2/1880 Spruce 220/234 istransmittedto and from adjacent charges via the ig- 1.771.455 7/1930 Wiley H 102/6 transmlsslon p 3,194 426 7/1965 Brown, Jr. ZED/23.4 1291,0511 12/1966 Ahlert et a1 102 90 6 3 F'gures PATENTED AUG] 91975 3, 899,977
  • the invention relates to a demolition charge and demolition charge assembly in order to destroy machines and equipment, especially telecommunication equipment.
  • the known demolition charges generally consist of an aluminothermic mixture which is housed in a cubeshaped housing.
  • the destructive effect of these charges rests on the development of a very hot, molten reaction product, which flows over equipment and apparatus that is to be destroyed and in doing so, destroys them.
  • the priming of these known demolition charges is accomplished by a fuse or primer connected firmly with the housing for the charge.
  • the known demolition charges have certain disadvantages.
  • the fuse connected firmly with the housing, can be reached only with difficulty after insertion of the charge in the apparatus that is to be destroyed (for example, in a level or deck of shelf-like telecommunication equipment).
  • the apparatus for example, in a level or deck of shelf-like telecommunication equipment.
  • the destruction of fairly large objects it will be necessary in most cases to place several demolition charges side by side or one above the other, whereby difficulties will then develop understandably during the necessary individual priming of the several demolition charges.
  • At least some of these objects are accomplished by perforating at least two lateral surfaces of the housing wall of each demolition charge with an ignition transmission window or opening.
  • Connecting extensions are preferably provided on the lateral surfaces having the ignition transmission windows. for the purpose of receiving a cover for the ignition transmission window.
  • the connecting extensions also couple the ignition transmission window of one charge in alignment with the associated ignition transmission window of a fuse igniter or the window of a corresponding connecting extension of an additional demolition charge.
  • the housing is of a generally flat construction and has a square base surface, that ignition transmission windows he provided (preferably centrally) on all four narrow sides, and that the connecting extensions are male and female extensions. preferably having mutually connective groove and tongue. dovetail connections.
  • the fuse is not necessarily rigidly connected with the housing, but may be attached after installation of the demolition charge into the installation that is to be destroyed.
  • This attachment may be made at the side of the housing most favorable for its handling, by means of a connection extension or a slide and fastening connection, whereby it then will be capable of igniting the alumino-thermic mixture in the hous-,
  • demolition charges according to the invention can be connected together, whereby the ignition transmission windows are in alignment with one another, so that it will be sufficient to attach a fuse igniter only to a single demolition charge, while the other demolition charges are ignited by ignition transmission through the aligned ignition transmission windows.
  • a covering is attached, which provides a protective covering for the ignition transmission window.
  • FIG. 1 shows a partial section through adjacent housing walls of two demolition charges
  • FIG. 2 is a view corresponding to FIG. I of a modified form of the invention.
  • FIG. 3 is a view, partially broken away, of a fuse connected to a demolition charge.
  • the number 10 designates a lateral wall of the housing of a first demolition charge and II a lateral wall of the housing of a second demolition charge.
  • the two demolition charges which have only partly been drawn, each have a flat cube shaped housing with a square base surface, in each of which housing an alumino thermic mixture is housed.
  • the housing wall 10 has a dovetailed tongue 12, which engages with a dovetailed groove 13 of the housing wall 11.
  • In the dovetailed groove 13 there is a perforation 15 likewise defining an ignition transmission window.
  • the ignition transmission window 14 is covered up by a thin foil 16, and the ignition transmission window 15, by a thin foil 17.
  • a small recess 18 in the lateral wall I0 cooperates with a small bulge 19 in the lateral wall 11, forming a stay or restraining connection.
  • the demolition chrages preferably consist of a flat. cube shaped housing with a square base surface, whereby all four narrow sides are developed like the sides or II of FIG. I.
  • two narrow sides each, preferably opposite ones, are provided with a dovetailed tongue, the other two narrow sides with a dovetailed groove 13.
  • All demolition charges can thus have a completely identical housing and are assembled each time so that a narrow side with a dovetailed tongue meets a narrow side with a dovetailed groove.
  • the four narrow sides of a demolition charge should desirably be the same, then one should make a design according to the modification of FIG. 2, whereby both lateral walls and 21 of adjacent demolition charges are provided with a dovetailed groove 22 or 23 respectively.
  • an ignition transmission element is put into the hollow space formed by the two grooves 22 and 23, which element, in section, has the shape of a dovetailed double tongue.
  • the element 30 then serves both as connector and as an ignition transmitter.
  • the element 30 may be formed of any suitable material capable of coupling the charges together and transmitting ignition from one charge to the other.
  • a fuse igniter 31 can be attached to the narrow side 10 of one of the demolition charges, such as a side 10' which is opposite the side 10 of the first demolition charge (FIG. 3).
  • the fuse 31 can be an electric fuse or a manual friction igniter, and can have an extension 32 corresponding to the connecting extension 12' of the narrow side of the charge housing.
  • a window 34 of the fuse communicates with the interior of the first charge through the window 14' (FIG. 3) and the first charge communicates with the second charge by means of the windows 14, 15.
  • Covers are attached to the free, narrow sides of the charge devices, therefore to such narrow sides which neither carry a fuse nor are connected with the narrow side of another demolition charge.
  • Such covers serve to protect the ignition transmission windows and may, for example, have the shape of contact strips.
  • ignition transmission windows can also be provided on the floor of the housing and on the ceiling of the housing, in order thus to make possible a stacking up of several demolition charges.
  • interconnectors (FIG. 3) within the housing of a charge behind the ignition transmission windows, which internal interconnectors extend effectively from one to the opposite ignition transmission window and bring about or facilitate the ignition of the alumino thermic mixture.
  • the ignition transmission windows are arranged each time centrally with respect to the lateral walls of the housing. Rather, they can indeed also be displaced, but it is essential that the arrangement is such that. upon assembly of demolition charges, the corresponding ignition transmission windows are in alignment.
  • a demolition charge according to the invention is highly versatile.
  • a charge assembly comprising a plurality of adjacently disposed charges, is required for the destruction ofa given piece of equipment, the charges may be conveniently coupled together with their ignition transmission openings aligned. In this fashion, the ignition of a single charge may be transmitted to all of the other charges through the aligned openings. This reduces the required number of fuses as well as the chances of malfunctions of certain fuses.
  • covers for the openings provides protection for the openings when not being used.
  • the transmission of ignition through the charge is facilitated by the use of interconnectors extending from one opening to another.
  • a demolition charge assembly for being mounted on equipment such as machines and telecommunication mechanism and destroying such equipment, said charge assembly comprising:
  • each charge comprising a cube-shaped housing containing an alumino-thermic mixture which, when activated, is operable to produce a molten reaction product for destroying said equipment, at least four of the sides of said housing each including:
  • dovetail tongue portion and dovetail groove portion coupled to a mating one of a dovetail tongue portion and dovetail groove portion of an adjoining side of an adjacently disposed charge to establish a dovetail connection therebetween
  • a dovetail connection portion of a selected charge of said charge assembly being arranged to receive a mating dovetail connection portion of a fuse such that an ignition-transmission opening of the fuse is mutually aligned with an ignitiontransmission opening of said selected charge so that ignition of said fuse is transmitted to said selected charge and to adjacent charges through said mutually aligned ignition-transmission openings;
  • each charge being arranged to connectably receive a plurality of charges to form charge assemblies of diverse sizes and shapes to destroy equipment of diverse sizes and shapes.
  • each charge has dovetail grooves on two of said four sides and dovetail tongues on the two other sides.
  • Apparatus according to claim 1 including covering foils disposed across said ignition transmission openings.
  • Apparatus according to claim 1 including interconnector means passing through the alumino-thermic mixture of each charge and interconnecting at least two of the ignition transmission openings.
  • said fuse comprises one of an electric fuse and a manual friction fuse.
  • a demolition charge assembly for being mounted on equipment such as machines and telecommunication mechanism and destroying such equipment, said charge assembly comprising:
  • each charge comprising a cube-shaped housing containing an alumino-thermic mixture which, when activated, is operable to produce a molten reaction product for destroying said equipment, at least four of the sides of said housing each including:
  • a dovetail groove portion aligned with a mating one of a dovetail groove portion of an adjoining side of an adjacently disposed charge to define a recess therebetween
  • dovetail groove of a selected charge of said charge assembly being arranged to be aligned with a mating dovetail groove of a fuse and receive a dovetail double tongue within a recess defined thereby such that an ignition-transmission opening of the fuse is mutually aligned with an ignition-transmission opening of said selected charge so that ignition of said fuse is transmitted to said selected charge and to adjacent charges through said mutually aligned ignitiontransmission openings;
  • each charge being arranged to be connected to a plurality of charges to form charge assemblies of diverse sizes and shapes to destroy equipment of diverse sizes and shapes.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuses (AREA)
  • Air Bags (AREA)
US424742A 1972-12-14 1973-12-14 Demolition charges Expired - Lifetime US3899977A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2261223A DE2261223C2 (de) 1972-12-14 1972-12-14 Zerstörladung

Publications (1)

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US3899977A true US3899977A (en) 1975-08-19

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US424742A Expired - Lifetime US3899977A (en) 1972-12-14 1973-12-14 Demolition charges

Country Status (6)

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US (1) US3899977A (ja)
DE (1) DE2261223C2 (ja)
FR (1) FR2210758B1 (ja)
GB (1) GB1446078A (ja)
IT (1) IT1002022B (ja)
SE (1) SE388268B (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223377A (en) * 1978-07-03 1980-09-16 Henry Williams Electra brick
GB9404333D0 (en) * 1994-03-07 1994-04-20 Secr Defence Two part ammunition round

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US224486A (en) * 1880-02-10 James spruce
US1771455A (en) * 1929-05-25 1930-07-29 Wiley Samuel Incendiary bomb
US3194426A (en) * 1963-12-12 1965-07-13 Jr Lynn E Brown Laterally interlocked containers
US3291050A (en) * 1965-04-30 1966-12-13 Elektro Thermit Gmbh Apparatus and method for the demolition of objects
US3311054A (en) * 1965-06-21 1967-03-28 John E Foster Smoke marker arrangement
US3338452A (en) * 1964-11-23 1967-08-29 Michael J Oakley Case for storage battery cell
US3611931A (en) * 1969-05-05 1971-10-12 Murell J Bessey Sequential burst air drop cluster

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US224486A (en) * 1880-02-10 James spruce
US1771455A (en) * 1929-05-25 1930-07-29 Wiley Samuel Incendiary bomb
US3194426A (en) * 1963-12-12 1965-07-13 Jr Lynn E Brown Laterally interlocked containers
US3338452A (en) * 1964-11-23 1967-08-29 Michael J Oakley Case for storage battery cell
US3291050A (en) * 1965-04-30 1966-12-13 Elektro Thermit Gmbh Apparatus and method for the demolition of objects
US3311054A (en) * 1965-06-21 1967-03-28 John E Foster Smoke marker arrangement
US3611931A (en) * 1969-05-05 1971-10-12 Murell J Bessey Sequential burst air drop cluster

Also Published As

Publication number Publication date
DE2261223B1 (de) 1973-12-06
FR2210758A1 (ja) 1974-07-12
DE2261223C2 (de) 1974-08-01
IT1002022B (it) 1976-05-20
DE2261223A1 (ja) 1973-12-06
GB1446078A (en) 1976-08-11
SE388268B (sv) 1976-09-27
FR2210758B1 (ja) 1980-01-11

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