US3587467A - Delayed action detonator - Google Patents

Delayed action detonator Download PDF

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Publication number
US3587467A
US3587467A US754115A US3587467DA US3587467A US 3587467 A US3587467 A US 3587467A US 754115 A US754115 A US 754115A US 3587467D A US3587467D A US 3587467DA US 3587467 A US3587467 A US 3587467A
Authority
US
United States
Prior art keywords
igniting
charge
delay
detonator
silicon
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
US754115A
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English (en)
Inventor
Helmut Menke
Hans Florin
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 US3587467A publication Critical patent/US3587467A/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
    • F42B3/16—Pyrotechnic delay initiators

Definitions

  • ABSTRACT A safe delayed action detonator having an igniter, a delay composition and at least a primary explosive where the igniter and the delay charge are mixtures of silicon [5 1] int. with either titanium, zirconium or both.
  • a delayed action detonator is constructed according to the following principle; it contains an igniting charge, a delay composition, a primary explosive and a secondary explosive.
  • the igniting charge is usually ignited by friction (friction cap) or electric current (bridge igniters, gap igniters, spark igniters).
  • the flame thereby produced starts the burning of the time-delay charge.
  • the latter then initiates a primary explosive which detonates the secondary explosive which is the actual charge that supplies the explosive force.
  • the processes occurring both in the electric fuse head and in the delay composition are chemical reactions.
  • the delay charges often involve a combustion process and such charges are often made of a mixture containing one component that contains oxygen and another component that reacts with oxygen.
  • one aspect of this invention resides in the use of certain alloyable metals and for metalloids for the igniting and delay charges of a detonator.
  • alloying heat is in the prior art.
  • an electrical squib a small electrical igniting unit
  • a powdered metal mixture of palladium and aluminum which performs the function of an electrical resistance wire (cf. electrical resistance wire delayed-action detonators) and of an igniting charge.
  • the igniting and delay charges are made of a mixture silicon powder with titanium and/or zirconium powder with the silicon being present in proportion of about 5 to 35 weight percent.
  • the mixtures according to the invention when sufficiently heated, enter into an alloy, whereupon so much alloying heat is released that the reaction (alloy formation) initiated in the igniting and delay charges formed by the said mixture reliably progresses.
  • the initiator mate 1 consists of a silicon-titamum igniting charge. It is embedded in a cylindrical plastic plug 2 in such a manner that at one end only the head of the match assembly protrudes, while at the other ,end the igniting wires 3 emerge. At the igniting pellet end of the plastic plug, a metal cap 4 is closely fitted over the latter; this cap is also filled with the silicon-titanium mixture as an igniting charge 5, and is compressed with low pressure (approx.' 5,000 lb./in.") against the igniter pellet, so that the latter is well embedded in the charge.
  • the delay charge 6, also consists of a silicon-titanium mixture. This charge is pressed in with increasing pressure up to 16,300 lb./in.”.
  • suitable incendiary charges or explosives In the lower portion 7 of the metal cap 8 are contained suitable incendiary charges or explosives. A plastic plug 9 crimped with the cap assures a tight closure of the cap.
  • the igniting pellet bridge wire made of materials which, like tungsten or molybdenum, have a sufficiently high melting point.
  • copper wires can also be used, because when copper is used as the bridge wire, it forms an alloy with the silicon when heated. The alloying heat thereby produced suffices to initiate the intended alloying with the silicon with titanium or zirconium.
  • the grain sizes of the metal powders amount to about 0.5 to 20' microns, and the surface area thereof is about 0.5 to 10 square meters per gram.
  • a detonator containing an igniting charge, a delay charge, and at least one explosive; the improvement which comprises utilizing as said igniting charge and said delay charge an alloyable powder mixture consisting essentially of about 5 to 35 weight percent silicon and at least one member selected from the group consisting of titanium and zirconium.
  • the improved detonator claimed in claim 1 having in addition bridge wire igniting wires selected from the group consisting of tungsten and molybdenum.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Closures For Containers (AREA)
US754115A 1967-08-17 1968-08-16 Delayed action detonator Expired - Lifetime US3587467A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED0053872 1967-08-17

Publications (1)

Publication Number Publication Date
US3587467A true US3587467A (en) 1971-06-28

Family

ID=7055314

Family Applications (1)

Application Number Title Priority Date Filing Date
US754115A Expired - Lifetime US3587467A (en) 1967-08-17 1968-08-16 Delayed action detonator

Country Status (5)

Country Link
US (1) US3587467A (nl)
BE (1) BE719493A (nl)
FR (1) FR1576201A (nl)
GB (1) GB1168419A (nl)
NO (1) NO118428B (nl)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299168A (en) * 1980-03-20 1981-11-10 The United States Of America As Represented By The United States Department Of Energy Resistance after firing protected electric match
US4402776A (en) * 1980-08-22 1983-09-06 Hughes Aircraft Company Silicon-containing compositions for self-sustained intermetallic reactions
US4429632A (en) 1981-04-27 1984-02-07 E. I. Du Pont De Nemours & Co. Delay detonator
US6841015B1 (en) 2003-10-09 2005-01-11 The United States Of America As Represented By The Secretary Of The Navy Delay element and ignition composition

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3800455A1 (de) * 1988-01-09 1989-07-20 Dynamit Nobel Ag Zuendelement, vorzugsweise mit langer verzoegerungszeit
TR23769A (tr) * 1989-11-20 1990-09-12 Baykal Makina San Ve Tic A S Hidrolik abkant preslerde mekanik stop ve reduektoer ince ayar kumandali hidromekanik dengeleme sistemi
NO905331L (no) * 1990-01-30 1991-07-31 Ireco Inc Forsinkelsesdetonator.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299168A (en) * 1980-03-20 1981-11-10 The United States Of America As Represented By The United States Department Of Energy Resistance after firing protected electric match
US4402776A (en) * 1980-08-22 1983-09-06 Hughes Aircraft Company Silicon-containing compositions for self-sustained intermetallic reactions
US4429632A (en) 1981-04-27 1984-02-07 E. I. Du Pont De Nemours & Co. Delay detonator
US6841015B1 (en) 2003-10-09 2005-01-11 The United States Of America As Represented By The Secretary Of The Navy Delay element and ignition composition

Also Published As

Publication number Publication date
NO118428B (nl) 1969-12-22
DE1646341A1 (de) 1971-07-08
BE719493A (nl) 1969-01-16
DE1646341B2 (de) 1975-07-31
FR1576201A (nl) 1969-07-25
GB1168419A (en) 1969-10-22

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