US3125954A - Vilbajo - Google Patents

Vilbajo Download PDF

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Publication number
US3125954A
US3125954A US3125954DA US3125954A US 3125954 A US3125954 A US 3125954A US 3125954D A US3125954D A US 3125954DA US 3125954 A US3125954 A US 3125954A
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United States
Prior art keywords
electrodes
conductor
gap
electrode
graphite
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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
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English (en)
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    • 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
    • F42B3/12—Bridge initiators
    • F42B3/124—Bridge initiators characterised by the configuration or material of the bridge
    • 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

Definitions

  • this line, stroke or thin strip of graphite comprising a gap acts as an electrical conductor bridging-over both electrodes.
  • aforesaid electrodes are concentric, whereas the strip of graphite is fitted radially to both, so that at one of its ends it is in permanent contact with one of the electrodes, and with its other end it is in permanent contact with the second electrode, the line, stroke or strip of graphite being cut across at some part of its length between both electrodes, and at least at the location of the resulting gap, comes into direct contact with the explosive charge.
  • FIGURE 1 is a radial section of a detonator conforming to the present invention
  • FIGURE 2 is a cross-section by a plane normal to the axis and containing line IIII of FIGURE 1;
  • FIGURE 3 is a partial radial cross-section drawn at a larger scale.
  • electrode 1 assumes the shape of a cylindrical envelope, the bottom edge 2 of which is curved inward so as to act as a retainer for a mass 3 of substance which is an electrical insulator, such as an appropriate synthetic material, into which the second electrode 4 is axially embedded.
  • Aforesaid insulating mass 3 is thus held between aforesaid lower edge 2 and a shoulder 5 extending to the corresponding bore of aforesaid cylindrical electrode.
  • a radial line or stroke 6 of graphite, or of some composition containing graphite is drawn and extends from the central electrode 4 right to the periphery of aforesaid insulating mass 3, so as to be in contact with the adjacent part of the outer electrode 1.
  • This line or stroke of graphite 6 is cut across at 7.
  • the edges of this gap will be cut at a slant as shown diagrammatically in 8 and 9 of FIGURE 3, this particular shape having proved to be the most effective.
  • the graphite stroke 6 with a gap at 7 is thus formed of two separate sections of which one is in contact with the outer electrode 1 whereas the other is in contact with the central electrode 4.
  • Explosive charges 10, 11 and 12 are stacked upon the insulating mass 3 and the electrode 4 and are located within the container formed by the electrode 1; they are held in place by a lid 13 engaging an annular slot formed by the electrode 1.
  • this line or stroke of graphite or graphite compound, or of any other substance fulfilling the same functions can be made or applied in a continuous way starting from the center of the axial electrode 4 and extending to the periphery of the insulating mass 3, this line or stroke being then provided with a gap, i.e. cut-across by means of an appropriate blade.
  • the present invention covers all and sundry embodiments of the characteristics which have been described above.
  • An electrical detonator comprising a tubular electrode having an inwardly curved bottom edge, another stem-like electrode having a head and partly located within the tubular electrode and extending axially thereto, insulating material carried by said curved bottom edge of the tubular electrode and separating said tubular electrode from said stem-like electrode, said stem-like electrode extending through said insulating mass, a line-shaped electrical conductor extending upon said insulating mass between said electrodes and adapted to constitute an electrical connection therebetween, said conductor having a gap separating it into a portion connected with said tubular electrode and another portion connected with the head of said stem-like electrode, explosive substances stacked upon said insulating material within said tubular electrode and in contact with said conductor, said conductor being chemically neutral with respect to the explosive substance with which it is in contact, and a lid closing said tubular electrode to maintain in place said explosive substances.
  • An electrical detonator comprising two separated electrodes, a line-shaped electrical conductor extending between said electrodes and adapted to constitute an electrical connection therebetween, said conductor having a gap separating it into a portion connected with one of said electrodes and another portion connected with the other one of said electrodes, and at least one explosive substance in contact with said conductor, said conductor being chemically neutral with respect to said substance, said gap having slanting edges.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Automotive Seat Belt Assembly (AREA)
US3125954D 1958-07-28 Vilbajo Expired - Lifetime US3125954A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE38241 1958-07-28

Publications (1)

Publication Number Publication Date
US3125954A true US3125954A (en) 1964-03-24

Family

ID=3840098

Family Applications (1)

Application Number Title Priority Date Filing Date
US3125954D Expired - Lifetime US3125954A (en) 1958-07-28 Vilbajo

Country Status (6)

Country Link
US (1) US3125954A (de)
BE (1) BE569814A (de)
CH (1) CH356380A (de)
DE (1) DE1125816B (de)
FR (1) FR1230317A (de)
GB (1) GB923534A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3264990A (en) * 1965-04-13 1966-08-09 Robert E Betts Focused exploding bridge wire
US3286631A (en) * 1963-09-12 1966-11-22 Dynamit Nobel Ag Electrical primer
US3332311A (en) * 1966-01-19 1967-07-25 Du Pont Electrically fired explosive fasteners
US3793920A (en) * 1972-11-16 1974-02-26 Du Pont Process for making a conductive-mix electrical initiator
US3795195A (en) * 1970-01-21 1974-03-05 J Silva Electrical initiator
WO1990013529A1 (en) * 1989-05-08 1990-11-15 Olin Corporation Electric primer with intrinsic conductive mix
US4994125A (en) * 1989-05-08 1991-02-19 Olin Corporation Electric primer with intrinsic conductive mix
US5144893A (en) * 1991-08-06 1992-09-08 The United States Of America As Represented By The Secretary Of The Army Safe ordnance initiation system
US20040231546A1 (en) * 2003-05-23 2004-11-25 Ofca William W. Safe electrical initiation plug for electric detonators
US7055434B1 (en) * 2003-03-04 2006-06-06 The United States Of America As Represented By The Secretary Of The Navy Electrical initiation system
US20160054111A1 (en) * 2013-11-07 2016-02-25 Saab Ab Electric detonator and method for producing an electric detonator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169482A (en) * 1963-08-14 1965-02-16 Eitelmccullough Inc Electro explosive device having a surface spark gap
DE1646337C1 (de) * 1967-05-30 1973-07-05 Deutsch Franz Forsch Inst Detonator
DE2654619C2 (de) * 1976-12-02 1982-09-09 Dynamit Nobel Ag, 5210 Troisdorf Kontaktierung eines elektrischen Zündmittels

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR982837A (fr) * 1948-04-03 1951-06-15 Bofors Ab Procédé pour allumer des explosifs et allumeur pour sa réalisation
US2687667A (en) * 1951-08-31 1954-08-31 Inventa Ag Primer for igniting explosives
US2708877A (en) * 1948-06-23 1955-05-24 Smitsvonk Nv Low tension igniter for explosives
US2754757A (en) * 1951-11-16 1956-07-17 Norman A Macleod Electrical detonator for explosives
GB805118A (en) * 1957-04-20 1958-11-26 Dynamit Nobel Ag Improvements in or relating to electric primers for ammunition
US2921520A (en) * 1953-06-18 1960-01-19 Donald M Stonestrom Detonator plug

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1084745A (en) * 1913-09-08 1914-01-20 Union Metallic Cartridge Co Electric primer.
DE1016605B (de) * 1953-07-14 1957-09-26 Inventa Ag Elektrischer Geschosszuender
NL181741B (nl) * 1953-07-16 Colgate Palmolive Co Vloeibaar reinigingsmiddel voor harde oppervlakken.
BE540685A (de) * 1954-08-23
DE961959C (de) * 1955-09-14 1957-04-11 Wasagchemie Ag Elektrischer Zuender

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR982837A (fr) * 1948-04-03 1951-06-15 Bofors Ab Procédé pour allumer des explosifs et allumeur pour sa réalisation
US2708877A (en) * 1948-06-23 1955-05-24 Smitsvonk Nv Low tension igniter for explosives
US2687667A (en) * 1951-08-31 1954-08-31 Inventa Ag Primer for igniting explosives
US2754757A (en) * 1951-11-16 1956-07-17 Norman A Macleod Electrical detonator for explosives
US2921520A (en) * 1953-06-18 1960-01-19 Donald M Stonestrom Detonator plug
GB805118A (en) * 1957-04-20 1958-11-26 Dynamit Nobel Ag Improvements in or relating to electric primers for ammunition

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286631A (en) * 1963-09-12 1966-11-22 Dynamit Nobel Ag Electrical primer
US3264990A (en) * 1965-04-13 1966-08-09 Robert E Betts Focused exploding bridge wire
US3332311A (en) * 1966-01-19 1967-07-25 Du Pont Electrically fired explosive fasteners
US3795195A (en) * 1970-01-21 1974-03-05 J Silva Electrical initiator
US3793920A (en) * 1972-11-16 1974-02-26 Du Pont Process for making a conductive-mix electrical initiator
US4994125A (en) * 1989-05-08 1991-02-19 Olin Corporation Electric primer with intrinsic conductive mix
WO1990013529A1 (en) * 1989-05-08 1990-11-15 Olin Corporation Electric primer with intrinsic conductive mix
US5027707A (en) * 1989-05-08 1991-07-02 Olin Corporation Electric primer with reduced RF and ESD hazard
US5144893A (en) * 1991-08-06 1992-09-08 The United States Of America As Represented By The Secretary Of The Army Safe ordnance initiation system
US7055434B1 (en) * 2003-03-04 2006-06-06 The United States Of America As Represented By The Secretary Of The Navy Electrical initiation system
US20040231546A1 (en) * 2003-05-23 2004-11-25 Ofca William W. Safe electrical initiation plug for electric detonators
US20160054111A1 (en) * 2013-11-07 2016-02-25 Saab Ab Electric detonator and method for producing an electric detonator
EP3066412A4 (de) * 2013-11-07 2017-07-12 Saab AB (publ) Elektrischer detonator und verfahren zur herstellung eines elektrischen detonators
US10180313B2 (en) * 2013-11-07 2019-01-15 Saab Ab Electric detonator and method for producing an electric detonator

Also Published As

Publication number Publication date
DE1125816B (de) 1962-03-15
BE569814A (de)
FR1230317A (fr) 1960-09-15
GB923534A (en) 1963-04-10
CH356380A (fr) 1961-08-15

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