US2563491A - Blasting assembly - Google Patents

Blasting assembly Download PDF

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Publication number
US2563491A
US2563491A US2563491DA US2563491A US 2563491 A US2563491 A US 2563491A US 2563491D A US2563491D A US 2563491DA US 2563491 A US2563491 A US 2563491A
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United States
Prior art keywords
powder
hydrox
blasting
fuse
charge
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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
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure
    • F42B3/06—Blasting cartridges, i.e. case and explosive for producing gas under pressure with re-utilisable case

Definitions

  • the present invention relatesto Hydron blasting assemblies.
  • Hydrox powder' is a mixture in granu lar form consisting essentially of a mixture ofA ammonium-chlorideand sodium nitrite stabilsed by the inclusion of a small percentage of a. faintly alkaline materiah ⁇
  • U. S. Patent No.' 2,038,772 d1s closes a charge of sodium nitrite :andammonium chloride and U. S. Patent 1 ⁇ To.'2,190,460 d1scloses mixtures of sodium nitrite and ammonium chloride stabilized with magnesium oxide as the "Hydrox powder set forth in this application.
  • the Hydrox blasting device normally includes a ported discharge head separated from the pressure resisting containerby, means 'of a steel disc adapted to yield a predetermined presrality -of Hydrox blasting assemblies connected together in a single electric circuit.
  • the object of the present invention is to enable lHyd'rox blasting to be carried out with simultaneousoccurrence of a plurality of shots.- We have now found that the time interval .between the completion of the electric circuit and the Venting of the products of decomposition of the fHydroxpowder can be reduced to a period short enough to enable simultaneous blasting effects to be' obtained from a plurality of Hydrox blasting devices electrically connected together -for simultaneous shot ring when the electricblack powder fuse is provided witlra j sheathing consisting of or comprising a perchlorate, particularly ammonium perchlorate.
  • the Hydrox blasting device normally includes also a nring head through which an electrically v actuated localheating means embedded in the Hydrox powder and adapted toinitiate its decomposition is connected with a source of current external to the device.
  • a charge consisting of or comprisl .ing a perchlorate, particularly ammonium per- 55 may conveniently contain up to. 60 grains of Under the rising :pressure condi- In a. Hydrox blasting device, therefore, ac-
  • the electric black powder fuse is provided with a sheathing consisting of., or comprising a perchlorate par#- ticularly ammonium perchlorate.
  • Tliel invention also comprises a-plurality of like"Hydrox blasting devices electrically 'connected for simultaneous shot firing, said Hy drox ⁇ blasting'devices having each in addition. to an electric powder fuse and a chargeof Hyohlorate sheathing said electric powder fuse.4
  • composition of the Hydrox powderfis greatly.
  • the electric powder fuse should contain not less thanaboutthe usual 60 50 milliseconds grains of black powder for a 460 gram 'charge of Hydroxpowder and the amount of 'ammonium perchlorate should be more than the quantity theoretically suillcient to oxidise the gases fronrthe black powder and its paper container to carbon dioxide, water andsulphur dioxide, but not so great scattered in an actively decomposing condition.
  • About 20 grams is a suitable charge'un'der these.A conditions.
  • the Hydrox powder 4 is preferably in a granulated ⁇ condition. Under these conditions the time interval between completion. oi.' the circuit and the venting of the gases is about- 30 milliseconds..4
  • Figure 1 is a longitudinal section of a Hydrox blasting device embodying the invention and matic drawing showing .how a heater unitcomprising an electric powder fusel is ensheathed in a charge of ammonium perchlorate.
  • i is the pressure resisting container portion
  • 2 is the ring head
  • 3 is the discharge head
  • 4 is the bursting disc of a Hydroxf blastingv tube.
  • 5 are the insulated leads from the firing head ands seen in greater detain in Figure 2 is the heater unit.
  • .1 is a charge of Hydrox powder N0. 2.
  • v 5 are the insulated leads
  • 6 is a paper tube
  • 9 is a of a polychloro-naphthalene wax.
  • disc and II is a rate.
  • Il is a paper harge oi' ammonium perchloi2 is a paper tube
  • Il andv il are plugs of polychloro-naphthalene wax, I5. Vis a low tensionelectric fusehead. Isis a charge of black powto I6 constitutes. 60 grain electric powder fuse, and the charge of Aammonium perchlorate H amounts to 20 grams.
  • a blasting device ci' the kind comprising a pressure resisting steel contained having a closure adapted to yield at'a predetermined and' delay intervals as to prevent its beingchlorate being scattered by thevexplosion of the a vconsiderable internal gas pressure and con ⁇ taining a charge in granular form consisting essentially of a mixture of sodium nitrite and ammonium chloride stabilized by the inclusion of asmall percentage of a faintly alkaline-material and electrically actuated local heating means -wherein the local heating means comprises an l electric black powder 2.
  • a blasting device asset'forth in claim 1 having a weight of ammonium perchlorate sheathing in excess to that quantity theoretically products resulting from the ignition of the black powder and yet a quantity not so great as to prevent it being scattered in an actively decomposing condition.
  • An electric black powder fuse having a sheathing consisting substantially of ammonium in ablasting device of the kind comprising a pressure resisting s teel container having-.a closure adapted to yield at a predetermined and a. considerable internal gas pressure .andcontaining a 'charge in granular consisting. essentially of .a mixture of sodium nitrite. andammonium chloride stabilized bythe inclusion of a small percentage of' faintly
  • Figure 2 is a detailed diagramcork plug and 8 and i1 plugs black .powder surrounded by .alkaline material and an electrically actuated heating means.
  • An electric fuse for use in a blasting device.
  • a pressure resisting steel container having a closure adapted to yield at a predetermined-and a considerable internal gas pressure and containing a charge in granular form consisting essentially of :a mixture of sodium nitrite and ammonium chloride stabilized by the inclusion of a small percentage of a alkaline material, said fuse comprising a core oi' a tubular casing, an electrical fuse head imbedded in the core, an ammonium perchlorate sheathing about said casing, and a second tubular casing enclosing said sheathing, each end of the .said casings being sealed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
US2563491D 1946-07-26 Blasting assembly Expired - Lifetime US2563491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22299/46A GB614761A (en) 1946-07-26 1946-07-26 Improvements in or relating to blasting assemblies

Publications (1)

Publication Number Publication Date
US2563491A true US2563491A (en) 1951-08-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US2563491D Expired - Lifetime US2563491A (en) 1946-07-26 Blasting assembly

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US (1) US2563491A (en(2012))
BE (1) BE474847A (en(2012))
FR (1) FR949410A (en(2012))
GB (1) GB614761A (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645181A (en) * 1950-01-04 1953-07-14 Materials Blasting Company Inc Blasting shell and firing mechanism therefor
US2916993A (en) * 1953-11-06 1959-12-15 Ici Ltd Blasting device
US2953448A (en) * 1953-01-14 1960-09-20 Ici Ltd Compositions for safety heating elements

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR15512E (fr) * 1911-03-25 1912-07-25 Peuble Et Durif Soc Cartouche pour fusil électrique
US1950038A (en) * 1932-02-24 1934-03-06 Scott Alexander Crnickshank Explosive
GB424785A (en) * 1933-08-30 1935-02-28 Albert Greville White Improvements in or relating to blasting explosive cartridges or borehole charges
US2038772A (en) * 1933-12-15 1936-04-28 Ici Ltd Blasting charge
US2075969A (en) * 1933-07-24 1937-04-06 Ici Ltd Blasting explosive cartridge and borehole charge
US2190460A (en) * 1935-08-21 1940-02-13 Ici Ltd Blasting charge
GB544252A (en) * 1940-07-01 1942-04-03 Walter Anderson Caldwell Improvements in or relating to the manufacture of non-detonating fuzes for blasting and similar purposes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR15512E (fr) * 1911-03-25 1912-07-25 Peuble Et Durif Soc Cartouche pour fusil électrique
US1950038A (en) * 1932-02-24 1934-03-06 Scott Alexander Crnickshank Explosive
US2075969A (en) * 1933-07-24 1937-04-06 Ici Ltd Blasting explosive cartridge and borehole charge
GB424785A (en) * 1933-08-30 1935-02-28 Albert Greville White Improvements in or relating to blasting explosive cartridges or borehole charges
US2038772A (en) * 1933-12-15 1936-04-28 Ici Ltd Blasting charge
US2190460A (en) * 1935-08-21 1940-02-13 Ici Ltd Blasting charge
GB544252A (en) * 1940-07-01 1942-04-03 Walter Anderson Caldwell Improvements in or relating to the manufacture of non-detonating fuzes for blasting and similar purposes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645181A (en) * 1950-01-04 1953-07-14 Materials Blasting Company Inc Blasting shell and firing mechanism therefor
US2953448A (en) * 1953-01-14 1960-09-20 Ici Ltd Compositions for safety heating elements
US2916993A (en) * 1953-11-06 1959-12-15 Ici Ltd Blasting device

Also Published As

Publication number Publication date
FR949410A (fr) 1949-08-30
GB614761A (en) 1948-12-22
BE474847A (en(2012))

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