US3070013A - Electrical igniter for effecting the ignition of explosive charges - Google Patents

Electrical igniter for effecting the ignition of explosive charges Download PDF

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Publication number
US3070013A
US3070013A US27747A US2774760A US3070013A US 3070013 A US3070013 A US 3070013A US 27747 A US27747 A US 27747A US 2774760 A US2774760 A US 2774760A US 3070013 A US3070013 A US 3070013A
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US
United States
Prior art keywords
ignition
face
capacitor
effecting
pole
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
US27747A
Other languages
English (en)
Inventor
Backstein Gunter
Berger Fritz
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.)
Rheinmetall Industrie AG
Original Assignee
Rheinmetall GmbH
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 Rheinmetall GmbH filed Critical Rheinmetall GmbH
Application granted granted Critical
Publication of US3070013A publication Critical patent/US3070013A/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
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/12—Primers; Detonators electric
    • 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
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/24—Cartridge closures or seals

Definitions

  • the present invention relates to an electrical igniter for effecting the ignition of explosive charges, of the type comprising a capacitor in the form of a coiled package which consists of spirally wound metal foil with an insulating intermediate layer, the capacitor including inner and outer poles, the metal foil being formed at one end in such a manner as to provide a plurality of sparking gaps across which sparking occurs when the capacitor is discharged.
  • the outer pole of the ignition capacitor has been provided by a metallic outer casing enclosing the coiled foil package, and the inner pole by a metallic former illing the inside of the coil, both the outer and the inner poles being the same length as the coil so that the end faces of the poles and the end face of the coil which comprises the ignition zone, were substantially located in the same plane.
  • an electrical igniter of the kind referred to for effecting the ignition of an explosive charge is so arranged that the end face of the coiled metal foil which comprises the ignition Zone is insulated from the inner or outer poles or from both said poles.
  • the arrangement according to the invention prevents the tendency for a strong electric field to build up between the two pole ends in the neighbourhood of the ignition zone. This was particularly likely in previously known igniters if the coil had thin walls so that the two poles were close together. Such an electric field has an adverse effect on the spark formation when the capacitor was discharged, ⁇ since the capacitor coil located between the two poles tended, due to the skin effect obtaining in the vicinity of the ignition zone, to discharge wholly or in part through the poles themselves, and thus no, or only a feeble sparking would occur which was insuliicient for the ignition of the explosive charge.
  • ⁇ FIGURE 1 is a sectional View of an electrical igniter according to one embodiment of the invention, incorporating a coiled capacitor and an outer pole in the form of a strip located below the ignition zone,
  • FIGURE 2 is a section viewof another embodiment of the invention incorporating an outer pole in the form of a ring enclosing the coil, and
  • FIGURE 3 is a sectional view of an assembly including a further embodiment of the invention including an igniter with a chamber for the priming charge formed by an insulating ring.
  • the electrical igniters illustrated in FIGURES 1 to 3 of the accompanying drawing consist essentially in the manner known per se of a coiled capacitor 1 which is formed by two metal foils with an interposed dielectric.
  • the two metal foils and their intermediate layer are coiled round part of a metallic former 2 which is connected electrically to the inner foil and e.g. to the positive terminal of a source of current.
  • This former 2 constitutes the inner pole of the igniter.
  • the outer metal foil is connected to the negative terminal of the source of current by means as described below.
  • the end face 3 of the capacitor 1 has the form of a coarsely cut surface, so that when a predetermined voltage is exceeded the energy stored in the capacitor will be discharged by sparking between the cut ends of the metal foils.
  • the formation of the end face 4 may be effected at the same time that the end face 3 of the metal foils are out.
  • the outer pole takes the form of a metallic strip 6 partly enclosing the outer surface 5 of the coil and so located that contact is made at some distance below the end face Ii of the coil which comprises the ignition zone.
  • the upper face 7 of the strip 6 is spaced at such distance from the end face 4 of the inner pole that the electric field building up between the poles cannot exert an adverse effect on the formation of sparks at the end face 3.
  • the air gap between the faces '3 and 7 forms an insulating layer.
  • the outer pole takes the form of a metallic ring 8 enclosing the coiled capacitor.
  • the upper face 9 of this ring is spaced from'the ignition end face 3 of the coiled package so that an air gap is formed between the end faces 4 and 9 of the poles 2 and Thus, here again the air forms an insulating layer in the vicinity of the ignition end face 3 and the outer pole 8.
  • An advantage of the ring Shaped pole is that it serves as a protection against damage.
  • the bore of the ring is tapered as shown at 10.
  • the inner pole 2 is separated from the outer pole 8 by a disc 11 made of electrically insulated material.
  • the coil is enclosed in the vicinity of the ignition zone by a ring 12 made of an insulating material, preferably a synthetic plastic, whichl extends beyond the end face 3 of the coil so that it provides a chamber for accommodating a primer charge 13.
  • the outer pole which in this embodiment comprises an annular body 14, also extends beyond the end face of the coil its upper end terminating in the plane of the end face of the insulating ring.
  • the member 14 has an annular recess which serves to locate the ring 12. In this arrangement the insulating ring 12 insulates the ignition zone from the outer pole 14, at and above the ignition zone.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)
US27747A 1959-05-15 1960-05-09 Electrical igniter for effecting the ignition of explosive charges Expired - Lifetime US3070013A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER25554A DE1082843B (de) 1959-05-15 1959-05-15 Elektrisches Zuendelement

Publications (1)

Publication Number Publication Date
US3070013A true US3070013A (en) 1962-12-25

Family

ID=7401945

Family Applications (1)

Application Number Title Priority Date Filing Date
US27747A Expired - Lifetime US3070013A (en) 1959-05-15 1960-05-09 Electrical igniter for effecting the ignition of explosive charges

Country Status (4)

Country Link
US (1) US3070013A (fr)
BE (1) BE590720A (fr)
DE (1) DE1082843B (fr)
GB (1) GB953336A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249049A (en) * 1964-07-31 1966-05-03 Zimmerman Theodore Ballistic primer
US3277824A (en) * 1964-07-15 1966-10-11 Hi Shear Corp Exploding bridgewire device
US3295446A (en) * 1964-03-12 1967-01-03 Rheinmetall Gmbh Electric primer
US4393779A (en) * 1977-10-20 1983-07-19 Dynamit Nobel Aktiengesellschaft Electric detonator element
WO2009106694A1 (fr) * 2008-02-28 2009-09-03 Patria Land & Armament Oy Élément de support et procédé pour le lancement de munitions

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963970A (en) * 1956-09-11 1960-12-13 Wasag Chemie A G Fa Electric detonator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963970A (en) * 1956-09-11 1960-12-13 Wasag Chemie A G Fa Electric detonator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295446A (en) * 1964-03-12 1967-01-03 Rheinmetall Gmbh Electric primer
US3277824A (en) * 1964-07-15 1966-10-11 Hi Shear Corp Exploding bridgewire device
US3249049A (en) * 1964-07-31 1966-05-03 Zimmerman Theodore Ballistic primer
US4393779A (en) * 1977-10-20 1983-07-19 Dynamit Nobel Aktiengesellschaft Electric detonator element
WO2009106694A1 (fr) * 2008-02-28 2009-09-03 Patria Land & Armament Oy Élément de support et procédé pour le lancement de munitions

Also Published As

Publication number Publication date
GB953336A (en) 1964-03-25
DE1082843B (de) 1960-06-02
BE590720A (fr) 1960-09-01

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