US3596598A - Self-destroying blasting cap - Google Patents

Self-destroying blasting cap Download PDF

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Publication number
US3596598A
US3596598A US776382A US77638268A US3596598A US 3596598 A US3596598 A US 3596598A US 776382 A US776382 A US 776382A US 77638268 A US77638268 A US 77638268A US 3596598 A US3596598 A US 3596598A
Authority
US
United States
Prior art keywords
blasting cap
metal
shell
blasting
magnesium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US776382A
Other languages
English (en)
Inventor
Josef Prior
Gottfried Prasnik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dynamit Nobel AG
Original Assignee
Dynamit Nobel AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
Application granted granted Critical
Publication of US3596598A publication Critical patent/US3596598A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F42B3/192—Initiators therefor designed for neutralisation on contact with water
    • 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
    • F42B3/11—Initiators therefor characterised by the material used, e.g. for initiator case or electric leads

Definitions

  • the disadvantage of the use of this known type of blasting cap lies in the fact that it is not detonatable only in the wet state and therefore constitutes no hazard only when wet; it they should float or be driven ashore, they might dry out completely and become entirely operative again.
  • a blasting cap that can be used without danger for underwater blasting in coastal waters must accordingly meet the following requirements: it must prevent the penetration of water over a certain defined period of time so as to maintain the association existing between the primary charge, the secondary charge and the plug containing the electrical primer. It must also permit the penetration of water after a number of hours for the purpose of destroying the ready-tooperate association between the individual charges. Furthermore, however, after the penetration of water into the individual charges, the assurance must be provided that these charges are permanently separated from one another and not capable of reuniting upon drying out.
  • a blasting cap which meets these requirements has, according to the invention, an outer shell of magnesium or its binary and/or ternary alloys which are not resistant to water, as for example magnesium alloys with silicon, bismuth, zinc or calcium.
  • magnesium alloys with silicon, bismuth, zinc or calcium as for example magnesium alloys with silicon, bismuth, zinc or calcium.
  • other base metals or their alloys which can be destroyed by water can be used for the shell.
  • the rate of decomposition of the blasting cap shell can be regulated according to the invention by bringing the blasting cap shell in close contact with a metal whose normal electrical potential is greater than that of the blasting cap shell. This more noble metal then forms with the metal or alloy of the blasting cap shell, due to the contact between the two metals, a local electric cell.
  • the contact can be brought about, for example, by drawing rings or sleeves of such a metal over the blasting cap shell, or simply by making a certain portion of the shell, which is intended to contain the explosive charge, out of such a metal (cf. example).
  • an electrolytic decomposition of the less noble metal blasting cap shell commences immediately. Depending upon the combination of the metal or alloy of the shell with a more or less noble metal, a more or less strong electrical potential is produced, which leads to a rapid or slower disintegration of the blasting cap shell.
  • blasting cap shell which is also of a metal whose normal electrical potential is greater than that of the blasting cap shell.
  • EXAMPLE 1 Blasting caps were used as per the drawing hereof which is a sectioned elevation thereof.
  • the blasting cap was made up of the following parts: (1) primer, (2) sleeves of nickeled copper, (3) inner shell, also of nickeled copper, (4) primary charge of lead azide, (5) secondary charge of tetryl, (6) magnesium shell. it should be noted that no sleeves 2. were present in this cap. After an immersion time of 1 hour in sea water, it was still possible to fire a blasting cap electrically.
  • blasting caps were used according to the annexed drawings, and were equipped with nickel plated copper sleeves 2. They were treated in the same manner as in Example 1. After an hour of immersion in sea water, a blasting cap could still easily be fired. Twelve hours of immersion in sea water, however, resulted in decomposition of the shell and the charges were no longer held together. The blasting cap could no longer be fired.
  • a blasting cap adapted for use in underwater applications and comprising a primer, a primary charge, a secondary charge, detonator means and housing means all in operative association with each other; the improvement which comprises said housing means comprising a shell of a first metal which is decomposable in contact with water, a second metal whose normal electrical potential is higher than said first metal in electrical contact with said first metal, which shell surrounds said blasting cap components.
  • said housing comprises a shell of said first metal surrounding said blasting cap components and at least one sleeve of said second metal over said shell.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Air Bags (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
US776382A 1967-12-01 1968-11-18 Self-destroying blasting cap Expired - Lifetime US3596598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671646347 DE1646347A1 (de) 1967-12-01 1967-12-01 Selbstzerstoerende Sprengkapsel

Publications (1)

Publication Number Publication Date
US3596598A true US3596598A (en) 1971-08-03

Family

ID=5684585

Family Applications (1)

Application Number Title Priority Date Filing Date
US776382A Expired - Lifetime US3596598A (en) 1967-12-01 1968-11-18 Self-destroying blasting cap

Country Status (10)

Country Link
US (1) US3596598A (enrdf_load_stackoverflow)
AT (1) AT282447B (enrdf_load_stackoverflow)
BE (1) BE724498A (enrdf_load_stackoverflow)
DE (1) DE1646347A1 (enrdf_load_stackoverflow)
DK (1) DK119696B (enrdf_load_stackoverflow)
ES (1) ES360298A1 (enrdf_load_stackoverflow)
FR (1) FR1598207A (enrdf_load_stackoverflow)
GB (1) GB1253048A (enrdf_load_stackoverflow)
NL (1) NL6817128A (enrdf_load_stackoverflow)
NO (1) NO119626B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099464A (en) * 1976-03-01 1978-07-11 Imperial Chemical Industries Limited Shaped explosive charge casing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484960A (en) * 1983-02-25 1984-11-27 E. I. Du Pont De Nemours And Company High-temperature-stable ignition powder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358601A (en) * 1966-06-29 1967-12-19 Hercules Inc Initiator systems
US3372640A (en) * 1966-08-03 1968-03-12 Du Pont Water-desensitized blasting caps
US3415188A (en) * 1967-03-31 1968-12-10 Atlas Chem Ind Sea water destructible booster assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358601A (en) * 1966-06-29 1967-12-19 Hercules Inc Initiator systems
US3372640A (en) * 1966-08-03 1968-03-12 Du Pont Water-desensitized blasting caps
US3415188A (en) * 1967-03-31 1968-12-10 Atlas Chem Ind Sea water destructible booster assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099464A (en) * 1976-03-01 1978-07-11 Imperial Chemical Industries Limited Shaped explosive charge casing

Also Published As

Publication number Publication date
GB1253048A (enrdf_load_stackoverflow) 1971-11-10
AT282447B (de) 1970-06-25
BE724498A (enrdf_load_stackoverflow) 1969-05-02
NO119626B (enrdf_load_stackoverflow) 1970-06-08
NL6817128A (enrdf_load_stackoverflow) 1969-06-03
ES360298A1 (es) 1970-07-01
FR1598207A (enrdf_load_stackoverflow) 1970-07-06
DE1646347A1 (de) 1971-08-05
DK119696B (da) 1971-02-08

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