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
• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
  • C06C5/00—Fuses, e.g. fuse cords
  • C06C5/06—Fuse igniting means; Fuse connectors
• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
  • C06C7/00—Non-electric detonators; Blasting caps; Primers
• • 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

• the invention concerns industrial detonators, both electric and nonelectric ones. This involves electrical detonators, which in their electrical design after the initiation by electric current or in their non-electric design after being initiated by a pulse from detonating tubes, burning fuses or detonating cords, generate by explosive conversion of their charges into detonating and impulse wave that consequently, along with fragments of explosive charge coat of the relevant industrial detonator, influence initiatively to other explosive objects forming detonating networks.
• 5182417 has its secondary explosive charge placed under its primary one, directly in the metal cup - here concretely in an aluminium casing.
• a similar arrangement is also used in detonator types according to RU Patents No. 2066829, No. 2089828, No. 2120101 , No. 2148239, No. 2148240, No. 2149341 and No. 2156945, or according to EP Patent Application No. 0679858.
• Certain specific directing of initiation pulses is achieved in the detonator type according to US Pat. No.
• the cup in its section-through arrangement, is designed in a combined surface consisting of grooves and crests but with its explosive charge placed again directly in the cup so that, beside an improved control of space-orientated effects, no progress in the control of detonator initiation power is achieved here.
• the detonator contains, placed in a line, a delay-action pyrotechnic, primary and secondary explosive charges, and where the principle consists in that both primary and secondary explosive charges are placed in the detonator cup in the first internal casing, which is shaped, at least along its part containing the secondary explosive charge, a prismatic shape.
• the cavity in the first internal casing may gradually widen towards the delay-action pyrotechnic. The delay-action pyrotechnic may be then, to further advantage, placed in a second internal casing.
• This second internal casing may be advantageously shaped into a ring tube.
• the first internal casing may have its cavity shaped to circular, star, or cross-like sections-through.
• First internal casing perimeter walls may have advantageously the same thickness as the casing bottom thickness.
• the first internal casing may be manufacture advantageously from non-metal materials.
• the first internals casing contains advantageously the explosive charge, consisting of primary and secondary explosives; the charge is loosely poured in this casing.
• the first internal casing may contain the explosive charge, consisting of primary and secondary explosives, compacted to densities from 0.5 to 3.0 g/cm 3 . This way the very detonator, providing reliable detonation and impact power for initiation acting to other explosive subjects forming blast distribution network and, at the same time, enabling an easy setting of initiation power so as not to damage other network neighbouring elements, can be accomplished.
• the detonator prepared according to this invention is formed in the jacket
• the first internal casing 2 containing the explosive (secondary) charge 3 is loaded, and furthermore, where in its funnelling top part the jacket contains the primary explosive charge 4 is located. Above this assembly of first internal casing 2, the second internal casing 5 is loaded; this casing is filled with delaying pyrotechnic 6.
• the first internal casing 2 is shaped as a cylinder, the bottom of which is thinner than the perimeter walls.
• the perimeter walls of the first internal casing 2 are shaped to form a star-like section-through cavity inside.
• the first internal casing 2 is shaped to form a cross-like section-through cavity inside.
• both second and third typical designs have their thinnest spots at the perimeter walls of the first internal casing 2, in such thicknesses as that of its bottom.
• plastics are used in this case.
• the second internal casing 5 is made of metal.
• the explosive charges they consist here of secondary explosive 3, represented by pentaerythrite tetranitrate and primary explosive 4, represented by plumbous azide and, in the above typical designs, the explosive charge is pressed in the first internal casing 2.
• the second internal casing 5, into which the delayed-action pyrotechnic 6 is bulk placed, has in all the typical designs a cylindrical section-through.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Air Bags (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (3)

Citations (10)

• 2001
  • 2001-08-06 CZ CZ20012859A patent/CZ292545B6/cs not_active IP Right Cessation
• 2002
  • 2002-08-05 WO PCT/CZ2002/000047 patent/WO2003014652A1/en not_active Application Discontinuation
  • 2002-08-05 EP EP02758051A patent/EP1488187A1/en not_active Withdrawn

Patent Citations (10)

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