US3376817A - Electric spark detonators - Google Patents

Electric spark detonators Download PDF

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Publication number
US3376817A
US3376817A US374537A US37453764A US3376817A US 3376817 A US3376817 A US 3376817A US 374537 A US374537 A US 374537A US 37453764 A US37453764 A US 37453764A US 3376817 A US3376817 A US 3376817A
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US
United States
Prior art keywords
electrodes
mass
priming
detonators
electric spark
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
US374537A
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English (en)
Inventor
Vilbajo Jean
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.)
Contigea SA
Original Assignee
Contigea SA
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Filing date
Publication date
Application filed by Contigea SA filed Critical Contigea SA
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Publication of US3376817A publication Critical patent/US3376817A/en
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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
    • F42B3/12—Bridge initiators
    • 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
    • F42B3/14—Spark initiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/12—Primers; Detonators electric

Definitions

  • the electric detonators according to the present invention are essentially characterized by the fact that between both electrodes a thin layer of some electric insulating material is inserted, which is essentially characterized by the fact that there is at least one hole going right through this material and that this hole is disposed in the vicinity of the junction between one of the electrodes and an inflammable or explosive material.
  • FIGURE 1 is a diagrammatic radial cross-section of the essential elements which are part of an electric spark detonator according to the present invention
  • FIGURE 2 is a Cross-section "by a plane whose trace follows the straight line II-II of FIGURE 1;
  • FIGURE 3 illustrates in radial cross-section the essential elements of the invention in an application which is decidedly different from the preceding one;
  • FIGURE 4 is a cross-section by a plane whose trace follows the straight line IV-1V of FIGURE 3;
  • FIGURE 5 illustrates in a radial cross-section a practical application of the design according to FIGURE 1;
  • FIGURE 6 is a cross-section by a plane whose trace follows the straight line VI-VI of FIGURE 5.
  • an electrode 1 of an electric detonator for projectiles is separated from the mass 2 by an insulating material 3.
  • This electrode 1 lies on top of a priming mixture 4 surrounded by the second electrode 5 which is in contact with aforesaid mass 2.
  • Aforesaid priming mass 4 lays in turn on top of the secondary charges 6.
  • Aforesaid priming mixture 4 may be either conducting or not. If it is conducting, the detonator will have a lesser electric resistance and therefore a higher sensitivity. If on the contrary, aforesaid priming mixture is nonconducting,
  • the electrical resistance of the detonator will be practically infinite and its sensitivity considerably less.
  • At least one thickness 7 of some insulating material such as for instance paper or mica or some synthetic resin or other is inserted between the first elec trode 1 and its insulating wrapping 3 on the one hand, and the second electrode 5 and its priming load 4 on the other hand.
  • At least one hole 8 goes right through this thickness 7 and is disposed in the vicinity not only of both electrodes 15 but also of the priming load 4.
  • aforesaid channel 8 slightly overlaps the junction between the priming mass 4 and the second electrode 5 whilst having on top the corresponding part of the first electrode 1 and the insulating mas 3.
  • the dimension of the thickness 7 determines systematically, without any difiiculty whatever and with a high degree of precision that of the interelectrode gap 1-5.
  • the manufacturing of such an electric detonator is extremely easy, fast and cheap.
  • the channel or channels 8 can be made either before or after mounting the detonator.
  • FIGURES 3 and 4 a very summary and diagrammatic illustration has been given of a form of embodiment based exactly on the same fundamental design but of very different morphology in order to show the universal character of the invention. It shows again the first electrode 1, the second electrode 5', the insulating insert 7, the channel or channels 8' which go right through aforesaid insert and the primary priming mixture 4'. Also, in this same form of embodiment, the channel or channels are disposed in the vicinity of the two electrodes and of the primary priming mixture 4'. If, in the first example illustrated in FIG- URES 1 and 2, the insert 7 assumed to shape of a very thin disc, in the example of FIGURES 3 and 4, it is coiled up cylindrically.
  • FIGURES 5 and 6 illustrate a practical application of aforesaid electric detonator to a primary device for projectiles.
  • first electrode 1 the outer Wrapping 2" forming the mass of the detonator
  • the primary priming mixture 4" the second electrode 5"
  • the secondary charges 6"6' the insulating insert 7" with its channels 8" which latter in this case are two diametrically opposite openings.
  • the two electrodes 1"5", the insulator 3", the primary priming charge 4" and the inserts 7"8" are mutually held together by a jacket 9" adjusted in the outer jacket 2" which forms the mass.
  • the object of the invention is to provide the means as such, consisting in establishing with precision the interelectrode gap by means of at least one insert of an insulating material pierced right through, at least in one spot, by a channel disposed in the vicinity both of the two electrodes and of the primary priming charge, as well as all and sundry applications of this means.
  • Electric spark detonator comprising a priming mass, a first ring-shaped electrode surrounding said mass, a second cylindrical electrode located above said priming mass and a disc-shaped layer of an electrically insulating material having at least one hole, said layer being interposed between one of said electrodes and said priming mass, on the one hand, and the other of said electrodes, on the other hand, whereby said hole establishes a path for a spark between an edge of one of said electrodes and the other of said electrodes through said priming mass.
  • said second electrode is embedded in a mass of 1,, VOLODYMYR Y. M AYEWSKY Examineran electrically insulating material.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Materials For Medical Uses (AREA)
  • Spark Plugs (AREA)
US374537A 1963-06-18 1964-06-11 Electric spark detonators Expired - Lifetime US3376817A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE633725 1963-06-18
BE42713 1963-06-18
BE519452 1964-04-23

Publications (1)

Publication Number Publication Date
US3376817A true US3376817A (en) 1968-04-09

Family

ID=27158421

Family Applications (1)

Application Number Title Priority Date Filing Date
US374537A Expired - Lifetime US3376817A (en) 1963-06-18 1964-06-11 Electric spark detonators

Country Status (7)

Country Link
US (1) US3376817A (es)
BE (2) BE646962A (es)
CH (1) CH404470A (es)
DE (1) DE1236986B (es)
FR (1) FR1398643A (es)
GB (1) GB1021487A (es)
SE (1) SE309179B (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809964A (en) * 1971-11-12 1974-05-07 Ministre Charge De La Defense Electrically actuated priming device
US4271453A (en) * 1978-07-01 1981-06-02 Nissan Motor Company, Limited Igniter with coupling structure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708877A (en) * 1948-06-23 1955-05-24 Smitsvonk Nv Low tension igniter for explosives
US2918871A (en) * 1953-08-04 1959-12-29 Beckman Instruments Inc Electrical detonator
US3019732A (en) * 1957-10-29 1962-02-06 Brevets Aero Mecaniques Electrical primers
US3118375A (en) * 1959-05-04 1964-01-21 High-tension or spark-type electric igniter
US3196041A (en) * 1960-11-25 1965-07-20 Gen Lab Associates Inc Method of making a semiconductor gap for an initiator

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE957735C (de) * 1957-01-17 Philips Patentverwaltung G.M.B.H., Hamburg Zündelement zum Auslösen der Verbrennung von schwer entzündbaren Stoffen
GB831827A (en) * 1957-04-30 1960-04-06 Beckman Instruments Inc Electrical detonator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708877A (en) * 1948-06-23 1955-05-24 Smitsvonk Nv Low tension igniter for explosives
US2918871A (en) * 1953-08-04 1959-12-29 Beckman Instruments Inc Electrical detonator
US3019732A (en) * 1957-10-29 1962-02-06 Brevets Aero Mecaniques Electrical primers
US3118375A (en) * 1959-05-04 1964-01-21 High-tension or spark-type electric igniter
US3196041A (en) * 1960-11-25 1965-07-20 Gen Lab Associates Inc Method of making a semiconductor gap for an initiator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809964A (en) * 1971-11-12 1974-05-07 Ministre Charge De La Defense Electrically actuated priming device
US4271453A (en) * 1978-07-01 1981-06-02 Nissan Motor Company, Limited Igniter with coupling structure

Also Published As

Publication number Publication date
BE633725A (es)
BE646962A (es) 1964-08-17
DE1236986B (de) 1967-03-16
FR1398643A (fr) 1965-05-07
GB1021487A (en) 1966-03-02
SE309179B (es) 1969-03-10
CH404470A (fr) 1965-12-15

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