US1868224A - Julius scbrttrmaun - Google Patents

Julius scbrttrmaun Download PDF

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Publication number
US1868224A
US1868224A US35065029A US1868224A US 1868224 A US1868224 A US 1868224A US 35065029 A US35065029 A US 35065029A US 1868224 A US1868224 A US 1868224A
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Prior art keywords
shunt
fuse
wire
fuses
charge
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Expired - Lifetime
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English (en)
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    • 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
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • 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
    • F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
    • 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
    • F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
    • F42B3/182—Safety initiators resistant to premature firing by static electricity or stray currents having shunting means

Definitions

  • the invention relates to electric blasting fuses and has for its object to provide an improved blasting fuse which shall be reliable in operation, readily testable even when 4 connected for being fired in series with a plurality of fuses, simple in construction and at the same time not liable to be actuated by stray'currents, i. e. such fuses which for being ignited require higher potential and greater o intensity of current than the potential and the intensity which may be supplied by stray currents even under the most unfavorable conditions.
  • these igniters also being desi ed to be fired at comparatively high potentials and further requiring greater current strengths than do high tension fuses, for example, they may be designed to require currents of 100, 150, 200 or more; milliamps;
  • Such high resistance wire bridge fuses have, however, the great disadvantage that even when a powerful shot firing machine is employed, only a relatively small number of fuses can be fired simultaneously.
  • High tension fuses are free from this drawback; they have, however, the disadvantage that although single fuses can be tested accurately. (with sufliciently sensitive testing instruments) ⁇ let in practice it is impossible, to 50 test a plura 'ty of fuses connected in series with a conducting layer the shunt may con 350,650, and in Germany October 1928. W
  • the principal object of the present invention is to provide electrical fuses which are secure against both, comparatively high stray potentials and c'omparativel intense stray currents; larger numbers 0 which can be fired in series connection with certainty; and which can be adequately tested even after having been connected together in series.
  • the essential feature of the invention resides in the provision exterior of the priming composition of a shunt conductor or conductors arranged to shunt or short circuit the ignition portion of the circuit.
  • the said shunt is so designed that it will be fused'or destroyed before it will allow sufficient current and potential to be applied to the ignition circuit proper to fire the priming.
  • the shunt conductor employed can be of any desired form and many will suggest themselves to those skilled in the art.
  • the match-head fuse in which the match-head is carried by an insulating strip having opposite sides coated veniently comprise a thin wire if desired wound in a spiral passing round the edge of the insulating strip and connecting together the two coatings.
  • a lagging for example, an asbestos winding.
  • the shunt is arran ed exterior of the fuse-head it is preferably arran ed sufiiciently near thereto to be includ in theusually provided casing for the complete-fuse so as to be protected from mechanical injury.
  • high tension fuses provided with shunts give the advantages of 0th wire-bridge fusesand high tension fuses, for the shunts may readily be made so uniform that large numbers of in series con nected fuses can be tested prior to ignition by means of ordinary resistance measuring apparatus (e. g. an ohmmeter) while the said shunts may be of such dimensions that they are only fused or burnt through with heavy currents for instance 1,000 to 1,200 milliamps'.
  • the higher resistance ignition circuit proper which is shunted by the shunt conductor provided in accordance with this invention reafter the shunt has been burnt a potential of 10,15, 20 or so volts (sufliciently high to be safe) and only a very low current strength (about 510 milliamps)
  • a potential of 10,15, 20 or so volts susfliciently high to be safe
  • a very low current strength about 510 milliamps
  • Figs. 1 to 6 show high tension fuses and Figs. 7 and 8 wire bridge fuses of the match-head type; Figs. 9 and 10 wire bridge fuses of the loose primer type in accordance with the invention.
  • reference number 1 represents a strip of non-conducting material
  • 2 and 2' represent conducting coatings on opposite sides thereof
  • 4.- represents the incandescent wire bridge. All these parts are as commonly employed and will be obvious from'the figures.
  • a shunt wire 5 passes over the narrow side of the strip 1 and is soldered at its ends to the coatings, 2, 2' as will be clear from a consideration of the sectional plan view shown in Fig. 1a.
  • Fig. 2 differs from that shown'in Figs. 1 and 1a only in that the shunt is formed of several (in the drawing three) parallel wires, 6, 6 and 6".
  • a shunt wire 7 is soldered to the edge of the coating 2, passes around said coating, around the narrow side of the strip 1 and around the coating 2 and is soldered to the edge of the coating 2 opposite the first quires,
  • Fig. 4 shows a modification of that shown in Fig. 3 differing therefrom only in that an asbestos winding or covering 9 is provided so that combustible materials which may be employed in the fuse are not liable to be ignited by the heat developed in the shunt wire.
  • shunt is in the form of a fine spiral, wire 10 connecting the coatings 2, 2.
  • the shunt 5 is arranged under the match-head between the fuse wires (fuse legs) 3 and 3 which are bared of insulation for a short distance for this purpose as shown.
  • the present invention does not relate to match head fuses only but as well to blasting fuses with a loose primer as shown in Figs. 9 and 10, Fig. 9 showing a high tension fuse, Fig. 10 showing an incandescent wire bridge fuse.
  • 10 is a case made of cardboard or any suitable material
  • 11 is the loose priming mass.
  • the fuse legs 3, 3' go through the bottom of the case directly into the loose priming mass.
  • the case 13 is made of insulating material as cardboard.
  • the end 14 of the fuse legs 3, 3 are bared of insulation, and inside of the case they are connected by theincandescent wire 4. Outside of the case the shunt 5 is soldered across the uninsulated ends of the fuse legs.
  • ignition circuit designates the circuit by which ignition is effected i. e. the circuit includng tion a priming charge, an ignition circuit for said priming charge and fusible shunt means connected across said ignition circuit exterior to said charge, said shunt means hav ing such dimensions that said ignition circuit cannot fire said charge until said shunt means are destroyed.
  • An electric fuse comprising in combination an insulat'in strip, conductive coatings on opposite si es of said strip, connect- T priming charge upon said strip, extendingin means for said conductive coatings, a
  • An electric fuse comprising in combination an ignition circuit including a bridge glow wire, a priming charge surrounding said glow wire and fusible shunt means con nected across said ignition circuit exterior to said charge.
  • An electric fuse comprising in combination a priming charge, an ignition circuit including a bridge wire embedded in said prim- I ing charge and shunt means 'destructible by electric current connected across said ignition circuit exteriorto said priming charge, said shunt means having such dimensions that said bridge glow wire cannot fire said charge until said shunt means'are destroyed.
  • An electricfuse comprising in combination an insulating strip, conductive coatings on opposite sides of said strip, connection means for said conductive coatings, a bridge glow wire connected between said coatings, a prlmmg charge surrounding said. wire and fusible shunt means connected between said' connecting means across said conducting coatings and said bridge glow wire.
  • An electric fuse comprising in combination an insulating strip, conductive coatings on opposite sides of said strip, connection means for said conductive coatings, a bridge glow'wire connected between said coatings, a priming charge surrounding said wire and fusible shunt means connected between said connecting means across said conducting coatings and said bridge glow. wire, said shunt means having such dimensions that said glow wire cannot fire said char e until said shunt means is fused by the firing current.
  • An electric fuse comprising in combination a priming charge an ignition circuit for said riming charge, and a shunt wire of fusib e material connected across said ignition circuit exterior to said charge said shunt wire having such dimensions that said ignition circuit cannot fire said charge until said shunt wire is burnt out by the firing current.
  • An electric fuse comprising in combination an insulating strip, conductive coatings on opposite sides of said strip, connection wires for said conductive coatings a primin charge upon said strip extending from one o the coatings to the other and fusible shunt means connected across said coatings.
  • An electric fuse comprising in combination an insulating strip, conductive coatings on opposite sides of said strip, connect on wires or said conductive coatings, a priming charge upon said strip and shunt means, of
  • said bridge glow wire has reached firing temperature.
  • An electric fuse comprising in combination an insulating strip, conductive coatings on opposite sides of said strip, connection means for said conductive coatings, a priming charge upon said strip,-fusible shunt means connected in parallel with an ignition circuit includin sa1d coatings and heat insulating means or said shunt means.
  • An electric fuse comprising in combination an insulating strip, conductive coatings on opposite sides of said strip, connection means for said conductive coatings, a priming charge upon said strip, liable to be destroyed by electric current, shunt means connected in parallel with an ignition circuit including sa1d coatings, said shunt means having such dimensions that said i ition circuit cannot fire said charge until sai shunt means are destroyed by the shot firing current and heat insulating means for said shunt means.
  • An electric fuse comprising in combination a priming charge, an igmtion circuit in operative connection with said priming charge, leading-in wires-connected to the ends of said ignition circuit, and fusible shunt means connected across said leading-in wires for inclusion in the usual fuse shell but suiiiciently spaced from the charge to prevent heat of fusion of the shunt from igniting the charge.
  • An electric fuse comprising in combination a metal casing, a loose priming charge in said casing; insulated leading-1n wires leading through said casing into said priming charge; fusible shunt means connected will not be fired until short circuit has been fused, the distance between the charge and fusible short circuit being sufficient to pro- 4 messes vent the heat of fusion from firing the charge.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuses (AREA)
  • Stroboscope Apparatuses (AREA)
US35065029 1929-01-02 1929-03-28 Julius scbrttrmaun Expired - Lifetime US1868224A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB182/29A GB326280A (en) 1929-01-02 1929-01-02 Improvements in or relating to electric blasting fuzes

Publications (1)

Publication Number Publication Date
US1868224A true US1868224A (en) 1932-07-19

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ID=9699838

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US35065029 Expired - Lifetime US1868224A (en) 1929-01-02 1929-03-28 Julius scbrttrmaun

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US (1) US1868224A (enrdf_load_stackoverflow)
BE (1) BE362434A (enrdf_load_stackoverflow)
FR (1) FR692676A (enrdf_load_stackoverflow)
GB (1) GB326280A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2445032A (en) * 1946-02-26 1948-07-13 Atlas Powder Co Detonating fuse
US3041972A (en) * 1958-12-15 1962-07-03 Atlas Chem Ind Arc resistant electric initiator
US3295447A (en) * 1965-04-06 1967-01-03 Atlas Chem Ind Electric match assembly and electric explosion initiators made therewith
US4049369A (en) * 1975-12-29 1977-09-20 Gte Sylvania Incorporated Photoflash lamp and multilamp unit with electrostatic protection
US5129322A (en) * 1990-05-14 1992-07-14 Jet Research Center, Inc. Explosive tubing cutter and method of assembly
WO2010066672A1 (de) * 2008-12-09 2010-06-17 Dynaenergetics Gmbh & Co. Kg Zünder für bergbau-, seismik- und ölfeldanwendungen und verfahren
US8960093B2 (en) 2011-04-12 2015-02-24 Dynaenergetics Gmbh & Co. Kg Igniter with a multifunctional plug

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2445032A (en) * 1946-02-26 1948-07-13 Atlas Powder Co Detonating fuse
US3041972A (en) * 1958-12-15 1962-07-03 Atlas Chem Ind Arc resistant electric initiator
US3295447A (en) * 1965-04-06 1967-01-03 Atlas Chem Ind Electric match assembly and electric explosion initiators made therewith
US4049369A (en) * 1975-12-29 1977-09-20 Gte Sylvania Incorporated Photoflash lamp and multilamp unit with electrostatic protection
US5129322A (en) * 1990-05-14 1992-07-14 Jet Research Center, Inc. Explosive tubing cutter and method of assembly
WO2010066672A1 (de) * 2008-12-09 2010-06-17 Dynaenergetics Gmbh & Co. Kg Zünder für bergbau-, seismik- und ölfeldanwendungen und verfahren
US8960093B2 (en) 2011-04-12 2015-02-24 Dynaenergetics Gmbh & Co. Kg Igniter with a multifunctional plug

Also Published As

Publication number Publication date
GB326280A (en) 1930-03-13
FR692676A (fr) 1930-11-08
BE362434A (enrdf_load_stackoverflow) 1929-08-31

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