US2000617A - Electric time fuse - Google Patents

Electric time fuse Download PDF

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Publication number
US2000617A
US2000617A US657780A US65778033A US2000617A US 2000617 A US2000617 A US 2000617A US 657780 A US657780 A US 657780A US 65778033 A US65778033 A US 65778033A US 2000617 A US2000617 A US 2000617A
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US
United States
Prior art keywords
charge
fuse
retarding
electric time
iron
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
US657780A
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English (en)
Inventor
Schaffler-Glossl Konrad
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2000617A publication Critical patent/US2000617A/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

  • One of the above mentioned' measures is the provision of a match head which, while being capable of easy electric ignition, generates, at the last stage of the combustion an intense heat withmuch gas generation and will ensure ignition of the retarding charge even if the latter should be difilcult to ignite.
  • the intention consists in coating the core of the match head with a layer of. metal powder mixed with an oxygen carrier.
  • Reliable ignition of the retarding charge is further ensured according to the invention by enclosing said charge in a cylinder presenting to the match head a tapered end whereon the heat is concentrated.
  • a further measure essential for the attainment of the object of the invention is the use of a retarding charge which will burn at a slow regular rate and which can be stored without degeneration, and in this respectthe invention consists in forming the charge from iron powder the particles of which are coated with a neutral, readily adhering substance such as chalk or the like, and mixed in coated condition with an oxygen carrier.
  • the attainment of the object of the invention is further conditional onthe provision of an herinetic closure for the different charges so that the internal gas .pressure will remain high and without fluctuations, in order that the combustion or the retarding charge may proceed with the desired speed and regularity.
  • the invention consists in closing the fuse car.- tridge with a plug of lead or other compressible material and sealing said-plug to the cartridge case and to the leading-in wires by pressing circumierential 5 and substantially. continuous grooves into the case and the plug.
  • the ruse comprises a cartridge case I contain-f 5 ing amatch head 2 and a retarding .charge 5.
  • the match head is carried by electric leading-in wires 1 which enter the cartridge through a ing the match head.
  • the match head comprises a core of easily ignitable material which immediatelysurrounds the fuse wire, and an outer coating 3 capable of generating an intense heat.
  • the coating consists of a metal powi5 der of iron, aluminium, zinc,.antimon y, zirconi um, or the like mixed with an oxygen carrier in the form of a chlorate or nitrate, for instance potassium chlorate or barium nitrate.
  • an oxygen carrier in the form of a chlorate or nitrate, for instance potassium chlorate or barium nitrate.
  • a mixture in about equal proportions of metal and oxygen 20 carrier has been shown to give the best results.
  • the thick wall of the surrounding 25 cylinder 4 istapered at the end which faces the match head, as shown in the drawing.
  • the extreme end of the charge will be surrounded by a ring of insulating air, and heat which would otherwise be dissipated through the cylinder I and through the cartridge case, will be available for ensuring a reliable ignition of the retarding charge.
  • a mixture of iron powder and an oxygen carrier for instance potas- 5 sium permanganate
  • an oxygen carrier for instance potas- 5 sium permanganate
  • the iron powder is mixed with a phlegmatizing substance," for instance chalk, capable of enclosing and adhering to the iron particles.
  • the iron powder is mixed with the chalk before the oxygen carrier is added. Treated in this manner the iron will be protected from over-rapid oxidation, and 50 the charge will burn slowly anduniiormly, very little heating of the cartridge will'take, place, and
  • the closing plug 6 which is made of lead or other compressible material, is hermetically sealed to the cartridge case by pressing circumferential and substantially continuous grooves 8 into cartridge case and plug. 1 This compression of the plug is made so that a simultaneous hermetic sealing of the plug to the leading-in wires 7, will be effected.
  • An electric time fuse comprising in combination a fuse case open at one end and closed at the other end, lead-in wires, a plug of yielding material longitudinally traversed by the said lead-in wires and adapted to form a closure of the open end of the saidrcase without any leakage, an electrically fired match head attached to the said wires and coated exteriorly with a mixture of metal powder and an oxygen carrier, a charge of a retarding composition composed of iron particles coated with a neutral phlegmatizing substance and mixed with an oxygen carrier, a shell containing the said retarding composition closely fitting within the said fuse case and having its end nearest to the said match head taperedly reduced in thickness of wall, and a priming charge located between the outer end of the said shell and the closed end of the fuse case, substantially the case.
  • the said retarding composition consisting of iron ⁇ particles coated with chalk and mixed with po-j tassium permanganate. 7
  • the said retarding composition consisting of iron particles coated with chalk and mixed with potassium permanganate, these ingredients being used in the proportions of 15:3:30 respectively.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
US657780A 1932-06-17 1933-02-21 Electric time fuse Expired - Lifetime US2000617A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT2000617X 1932-06-17

Publications (1)

Publication Number Publication Date
US2000617A true US2000617A (en) 1935-05-07

Family

ID=3689580

Family Applications (1)

Application Number Title Priority Date Filing Date
US657780A Expired - Lifetime US2000617A (en) 1932-06-17 1933-02-21 Electric time fuse

Country Status (3)

Country Link
US (1) US2000617A (en, 2012)
BE (1) BE394371A (en, 2012)
FR (1) FR750590A (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547820A (en) * 1945-12-29 1951-04-03 Gustaf W Hammar Fuse and igniter
US2604044A (en) * 1948-06-23 1952-07-22 Atlas Powder Co Blasting cap

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547820A (en) * 1945-12-29 1951-04-03 Gustaf W Hammar Fuse and igniter
US2604044A (en) * 1948-06-23 1952-07-22 Atlas Powder Co Blasting cap

Also Published As

Publication number Publication date
FR750590A (fr) 1933-08-12
BE394371A (en, 2012)

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