US3878785A - Propagation device and initiation system for low energy fuses - Google Patents

Propagation device and initiation system for low energy fuses Download PDF

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Publication number
US3878785A
US3878785A US306923A US30692372A US3878785A US 3878785 A US3878785 A US 3878785A US 306923 A US306923 A US 306923A US 30692372 A US30692372 A US 30692372A US 3878785 A US3878785 A US 3878785A
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United States
Prior art keywords
impulse
length
explosive
connecting block
fuse
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Expired - Lifetime
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US306923A
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English (en)
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Hans Krister Lundborg
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Nitro Nobel AB
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Nitro Nobel AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/04—Arrangements for ignition
    • F42D1/043—Connectors for detonating cords and ignition tubes, e.g. Nonel tubes
    • 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

Definitions

  • ABSTRACT [30] Foreign Application Priority Data An explosive assemblage including a first length of Dec. 1. 1971 Sweden 15380/71 fuse having one end which receives an iniiialing pulse and a second end in contact with a detonator in 52 us. (:1. 102/27 R; 102/22 a connecting block which 8189 engages an intermedi- 51 1111. c1. C06c 5/06 ate region of a second length 9f fuse against the [58] Field of Search 102/22.
  • low energy fuses e.g.. with completely filled explosive cores or other embodiments of the gas channel of the conductor.
  • low en ergy fuses denotes fuses with such a low self explosive effect they are not capable of propagating a detonation from one fuse connected to another or to an explosive of the conventional type used for blasting work without the aid of an exploding or initiating device.
  • a low energy fuse In order to initiate e.g., a blasting charge set in a drill hole, a low energy fuse is fitted with a detonator; the explosive or initiating charge of which is initiated by the gas shock wave from the fuse. The explosive charge of the detonator in turn initiates the blasting charge.
  • the gas shock wave is generated in the fuse by means of an appropriately adapted shock wave, spark discharge or the like.
  • a known and commonly used method of simultaneously initiating several low energy fuses in a blasting salvo is, with the aid of appropriately designed fastening devices and possibly initiating detonators, to connect the respective low energy fuses along a detonating fuse (detonating cord) which has such a great self explosive effect that this is capable of initiating the detonation process in the low energy fuses in the respective connection points.
  • the detonating fuse is usually initiated with a detonator.
  • Initiation with detonating fuse involves a number of drawbacks, in the form of great self explosive effect, which can cause damage to the environment or cause the disengaging of connected, but not yet initiated low energy fuses which, in turn, results in the blasting salvo being.
  • Another major drawback consists of the noise made by the detonating fuse, which in many cases makes it impossible to use in densely populated areas.
  • An object of the present invention is to reduce to a considerable extent and in certain cases to eliminate these drawbacks. This is achieved in that the length of detonating fuse required for each igniter in a blasting salvo of the kind described is replaced entirely by an extension of the low energy fuse, an initiating detonator or an explosive charge with its explosive effect having been given a maximum reduction for its purpose and an appropriately designed connection block.
  • connection to form an initiation system according to the invention of several such igniters, each consisting of a detonator, a low energy fuse of a certain length and a propagation device requires that a gas shock wave generated at one point in an igniter is propagated to the fuses of the other igniters for initiation of the respective detonators.
  • the transmission of the gas shock wave takes place without any reduction of its propagation velocity, even if the gas shock wave has an intermittent propagation process.
  • the gas channel or channels along which the gas shock wave is to be propagated must be protected internally.
  • the protection is arranged in such a way that when connecting several individually closed igniters together a coherent fuse system is obtained, which must not be exposed to water or dirt during the connection procedure.
  • Each individual igniter i.e., the ignition function required for each charge or drill. hole, consists of a fuse with detonator and propagation device according to the invention and thus constitutes a moisture-proof closed unit, which can have varying lengths of fuse and delay intervals.
  • the connecting together of igniters to form a continuous initiation system is carried out with the aid of propagation devices (connection blocks with initiating detonators or pressed-in explosive charges) which can be connected to another low energy fuse anywhere along its length.
  • the connection block conmeets the igniters together mechanically.
  • connection block also constitutes a protection from and dampens the explosive effect of the initiating detonator and, finally, constitutes a protectionfor the initiating detonator from external mechanical damage.
  • connection between blasting salvos with different charges, or between charges where the length of the fuse is insufficient can be made with specially manufactured splicing fuses with a propagation device in one end and a moisture-proof closure in the other end.
  • a connection block (or propagation device) for connecting together individual igniters to form an initiation system consists of a body, particularly of plastic, with a recess for the insertion of a fuse with a crimped-on initiating detonator and one or several fuse channels for the insertion of one or several fuses to be initiated.
  • the fuses can appropriately be folded double when they are inserted in the fuse channels.
  • the block can also have a configuration as above, but with a recess in which an explosive charge has been pressed in, either directly or via a casing (propagation device). The fuse is inserted in the recess, and the block is crimped onto the fuse.
  • the fuse channels can be parallel, at right angles or at a certain angle to the inserted detonator, or the pressed-in explosive charge.
  • the fuse channel can also be arranged axially with the initiating detonator.
  • the connection block can be provided with mechanical locking; members, e.g., protruding parts, for securing the folded fuse.
  • FIGS. 1-4 show four alter-native embodiments of connection blocks
  • FIGS. -7 and 8-13 show two embodiments of connection blocks consisting of two parts which can be fastened together
  • FIG. 14 shows an igniter according to the invention
  • FIG. shows schematically an initiation system according to the invention.
  • the reference figures are common for all of the figures.
  • connection blocks comprise of a body 1, particularly made of plastic, with a recess 2 for the insertion of an initiating detonator, which is connected with a fuse, and one or several fuse channels 3 for the insertion of one or several fuses 4 which have been folded double.
  • the channels are to be arranged in such a way that .some part of the fuse 4 comes into direct contact with the detonator or in close proximity thereto.
  • the fuse channel is arranged axially with the detonator recess 2.
  • FIG. .5 shows another connection block I, viewed frorn the side, FIG. 6 a cross-section view, and FIG. 7 the two parts in cross section.
  • the block consists of the twosparts 5 and 6, which can be fastened together, as ;shown in FIG. -7.
  • One of the parts 5 is made with a central recess 2, for insertion of an initiating detonator, and two fuse channels 3, parallel therewith, for insertion of two fuses 4, folded double.
  • an upper part 6, made with a corresponding cavity 2 for securing the detonator.
  • the part 6 is made with two protrusions 7, over which the folded ends of the fuse 4 can be snapped and secured. See FIGS. 5 and 6.
  • FIGS. 8-13 show another embodiment of a connection blockl, consisting of two parts 5 and 6, which can be fastened together.
  • One of the parts 5 is made with one large central recess 2 and two smaller recesses 3 in the bottom, which constitute part of the fuse channels.
  • the part 6 is made in the form of a plastic body with a central hole 8, into which the explosive charge 10 is pressed down, either directly or via a casing 9.
  • the part 6 is also made with two parallel recesses 11, which together with part 5 constitute the fuse channels 3.
  • protrusions 7 constitute members for securing the folded fuses 4. Parts 5 and 6 arefastened together and secured through snap locking. i
  • the blocks according to FIGS. 5l3 have two channels, for the insertion of two fuses, i'gniters can be connected together, as well as the initiation of two salvos connected in parallel.
  • FIG. 14 An example of an embodiment of an igniter which has previously been described is shown schematically in FIG. 14, in which 9 designates a detonator for initiation of the blasting charge in e.g., a drill hole, 4 designates the low energy fuse and a propagation device consisting of the connection block 1 and the initiating detonator or pressed-in explosive charge 10.
  • the designation propagation device is a common term meaning a connection block enclosing an inserted detonator crimped directly on the fuse, or a connection block with a fixed explosive charge pressed into the block, either directly or via a casing: In the latter case, the block is connected directly to the fuse.
  • FIG. 15 shows schematically an initiation system in which propagation devices according to the invention are used.
  • An initiating detonator is initiated in an appropriate way according to an earlier description.
  • a gas shock wave follows the initiating fuse and initiates the detonator in the propagation device No. 1.
  • Igniter No. l is thereby punctured and initiated in two directions, one direction down to an interval detonator in the drill hole No. 1 and the other direction to the initiating detonator in propagation device No. 2, after which the process and the initiation is repeated to an unlimited number of blasting charges in a series of drill holes.
  • connection blocks, the propagation devices and the initiation system have been developed for low energy fusesaccording to the Swedish'Pat. No. 333,321.
  • the same connection blocks, propagation devices and initiation system can also be used for other fuses of low energy type.
  • An explosive assemblage comprising in combination a first length of impulse propagating means having first and second ends, a first connecting block engaging said first length of impulse propagating means intermediate its first and second ends, said connecting block having an impulse intensifier means operatively adjacent the engaged region of said first length of impulse propagating means, a second length of impulse propagating means having one end for receiving an initiation impulse and a second end engaged by said first connecting block operatively adjacent said impulse intensifier means, a detonator for an explosive charge connected to the first end of said first length of impulse propagating means, and a second connecting block including another impulse intensifier means connected to the second end of said first length of impulse propagating means so that when said one end of said second impulse propagating means receives an initiation impulse it propagates to the impulse intensifier means in said first connecting block which generates an intensified impulse which propagates simultaneously to the first and second ends of said first impulse propagating means.
  • the explosive assemblage of claim 1 wherein at least said first connecting block is provided with a plurality of parallel channels,'two of said'channels housing 6.
  • the explosive assemblage of claim 3 further comprising locking means at one end of said channels for mechanically securing the lengths of impulse propagating means.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuses (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Air Bags (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US306923A 1971-12-01 1972-11-15 Propagation device and initiation system for low energy fuses Expired - Lifetime US3878785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1538071 1971-12-01

Publications (1)

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US3878785A true US3878785A (en) 1975-04-22

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US306923A Expired - Lifetime US3878785A (en) 1971-12-01 1972-11-15 Propagation device and initiation system for low energy fuses

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US (1) US3878785A (xx)
AT (1) AT328938B (xx)
AU (1) AU469127B2 (xx)
BR (1) BR7208338D0 (xx)
CA (1) CA985956A (xx)
DE (1) DE2255106C3 (xx)
ES (1) ES409390A1 (xx)
FI (1) FI57741C (xx)
GB (1) GB1420950A (xx)
IT (1) IT975896B (xx)
NO (1) NO134110C (xx)
SU (1) SU656498A3 (xx)
ZA (1) ZA727873B (xx)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987732A (en) * 1975-02-10 1976-10-26 The Ensign-Bickford Company Non-electric double delay borehole downline unit for blasting operations
US3987733A (en) * 1975-02-10 1976-10-26 The Ensign-Bickford Company Millisecond delay surface connector
US4187780A (en) * 1978-05-10 1980-02-12 Ensign-Bickford Company Detonating cord and blasting cap connector block
EP0083165A2 (en) * 1981-12-28 1983-07-06 E.I. Du Pont De Nemours And Company Non-electric blasting assembly
US4481884A (en) * 1981-12-28 1984-11-13 E. I. Du Pont De Nemours And Company Field-connected explosive booster for initiating low-energy explosive connecting cords
US4495867A (en) * 1982-06-18 1985-01-29 E. I. Du Pont De Nemours And Company Assembly for initiating explosives with low-energy detonating cord
US4714018A (en) * 1985-07-01 1987-12-22 Nitro Nobel Ab Method and means for connecting fuses
US4757764A (en) * 1985-12-20 1988-07-19 The Ensign-Bickford Company Nonelectric blasting initiation signal control system, method and transmission device therefor
US4821645A (en) * 1987-07-13 1989-04-18 Atlas Powder Company Multi-directional signal transmission in a blast initiation system
US4953464A (en) * 1987-07-13 1990-09-04 Atlas Powder Company Multi-directional signal transmission in a blast initiation system
US5012741A (en) * 1990-04-16 1991-05-07 The Ensign-Bickford Company Initiator for a transmission tube
US5086702A (en) * 1990-04-12 1992-02-11 Atlas Powder Company Modular blasting system
US5162606A (en) * 1990-04-12 1992-11-10 Atlas Powder Company Modular blasting system
US5204492A (en) * 1991-10-30 1993-04-20 Ici Explosives Usa Inc. Low noise, low shrapnel detonator assembly for initiating signal transmission lines
US5473987A (en) * 1990-08-13 1995-12-12 Imperial Chemical Industries Plc Low energy fuse
US5594196A (en) * 1995-04-20 1997-01-14 Ireco, Inc. Shock tube surface connector
US5659149A (en) * 1996-01-18 1997-08-19 The Ensign-Bickford Company Secure connector for blast initiation signal transfer
US5703320A (en) * 1996-01-18 1997-12-30 The Ensign Bickford Company Connector for blast initiation system
US5708228A (en) * 1996-01-11 1998-01-13 The Ensign-Bickford Company Method and apparatus for transfer of initiation signals
US20040200372A1 (en) * 2001-04-24 2004-10-14 Gladden Ernest L. Non-electric detonator
US9133072B1 (en) * 2013-03-20 2015-09-15 The United States Of America As Represented By The Secretary Of The Army Tactical capsule charge system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7604047L (sv) * 1976-04-06 1977-10-07 Nitro Nobel Ab Anleggning for sprengning av kroppar sasom berg, betong och dermed liknande
US4494392A (en) * 1982-11-19 1985-01-22 Foster Wheeler Energy Corporation Apparatus for forming an explosively expanded tube-tube sheet joint including a low energy transfer cord and booster
DE3520490A1 (de) * 1985-04-10 1986-10-16 Friedrich-Wilhelm Dipl.-Kaufm. 4600 Dortmund Sobbe Vorrichtung zum verbinden von sprengschnur und zuender
PE46296A1 (es) * 1994-10-07 1996-10-31 Austin Powder Co Bloque conector para retener lineas tubulares de transmision
FR2937638B1 (fr) * 2008-10-24 2010-12-17 Davey Bickford Dispositif de connexion d'au moins deux tubes conducteurs a onde de choc
RU2584285C1 (ru) * 2014-12-04 2016-05-20 Акционерное общество "Новосибирский механический завод "Искра"(АО НМЗ "Искра") Соединитель для подрывных инициирующих устройств

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3175491A (en) * 1963-06-08 1965-03-30 Canadian Ind J-shaped detonating fuse connector
US3212439A (en) * 1961-11-24 1965-10-19 Schlumberger Prospection Blasting caps containing only secondary explosive
US3349706A (en) * 1966-07-15 1967-10-31 Du Pont Tailless connector
US3570402A (en) * 1967-10-11 1971-03-16 Ici Ltd Detonator connector
US3614928A (en) * 1969-03-12 1971-10-26 Gulf Oil Corp Cast high explosive primer
US3713384A (en) * 1969-03-31 1973-01-30 Ici Ltd Blasting method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205818A (en) * 1963-08-02 1965-09-14 Du Pont Connector for explosive cords

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3212439A (en) * 1961-11-24 1965-10-19 Schlumberger Prospection Blasting caps containing only secondary explosive
US3175491A (en) * 1963-06-08 1965-03-30 Canadian Ind J-shaped detonating fuse connector
US3349706A (en) * 1966-07-15 1967-10-31 Du Pont Tailless connector
US3570402A (en) * 1967-10-11 1971-03-16 Ici Ltd Detonator connector
US3614928A (en) * 1969-03-12 1971-10-26 Gulf Oil Corp Cast high explosive primer
US3713384A (en) * 1969-03-31 1973-01-30 Ici Ltd Blasting method

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987732A (en) * 1975-02-10 1976-10-26 The Ensign-Bickford Company Non-electric double delay borehole downline unit for blasting operations
US3987733A (en) * 1975-02-10 1976-10-26 The Ensign-Bickford Company Millisecond delay surface connector
US4187780A (en) * 1978-05-10 1980-02-12 Ensign-Bickford Company Detonating cord and blasting cap connector block
EP0083165A2 (en) * 1981-12-28 1983-07-06 E.I. Du Pont De Nemours And Company Non-electric blasting assembly
EP0083165A3 (en) * 1981-12-28 1984-05-30 E.I. Du Pont De Nemours And Company Non-electric blasting assembly
US4481884A (en) * 1981-12-28 1984-11-13 E. I. Du Pont De Nemours And Company Field-connected explosive booster for initiating low-energy explosive connecting cords
US4495867A (en) * 1982-06-18 1985-01-29 E. I. Du Pont De Nemours And Company Assembly for initiating explosives with low-energy detonating cord
US4714018A (en) * 1985-07-01 1987-12-22 Nitro Nobel Ab Method and means for connecting fuses
US4757764A (en) * 1985-12-20 1988-07-19 The Ensign-Bickford Company Nonelectric blasting initiation signal control system, method and transmission device therefor
US4821645A (en) * 1987-07-13 1989-04-18 Atlas Powder Company Multi-directional signal transmission in a blast initiation system
US4953464A (en) * 1987-07-13 1990-09-04 Atlas Powder Company Multi-directional signal transmission in a blast initiation system
US5086702A (en) * 1990-04-12 1992-02-11 Atlas Powder Company Modular blasting system
US5162606A (en) * 1990-04-12 1992-11-10 Atlas Powder Company Modular blasting system
US5012741A (en) * 1990-04-16 1991-05-07 The Ensign-Bickford Company Initiator for a transmission tube
US5473987A (en) * 1990-08-13 1995-12-12 Imperial Chemical Industries Plc Low energy fuse
US5204492A (en) * 1991-10-30 1993-04-20 Ici Explosives Usa Inc. Low noise, low shrapnel detonator assembly for initiating signal transmission lines
US6123025A (en) * 1991-10-30 2000-09-26 Orica Explosives Technology Pty Ltd. Low noise, low shrapnel detonator assembly for initiating signal transmission lines
US5594196A (en) * 1995-04-20 1997-01-14 Ireco, Inc. Shock tube surface connector
US5708228A (en) * 1996-01-11 1998-01-13 The Ensign-Bickford Company Method and apparatus for transfer of initiation signals
US5659149A (en) * 1996-01-18 1997-08-19 The Ensign-Bickford Company Secure connector for blast initiation signal transfer
US5703320A (en) * 1996-01-18 1997-12-30 The Ensign Bickford Company Connector for blast initiation system
US20040200372A1 (en) * 2001-04-24 2004-10-14 Gladden Ernest L. Non-electric detonator
US7188566B2 (en) 2001-04-24 2007-03-13 Dyno Nobel Inc. Non-electric detonator
US9133072B1 (en) * 2013-03-20 2015-09-15 The United States Of America As Represented By The Secretary Of The Army Tactical capsule charge system

Also Published As

Publication number Publication date
FI57741C (fi) 1980-10-10
IT975896B (it) 1974-08-10
BR7208338D0 (pt) 1973-09-25
ATA951972A (de) 1975-06-15
ES409390A1 (es) 1976-03-16
AU469127B2 (en) 1976-02-05
CA985956A (en) 1976-03-23
DE2255106C3 (de) 1981-09-10
GB1420950A (en) 1976-01-14
DE2255106A1 (de) 1973-06-07
NO134110C (xx) 1976-08-18
AU4937772A (en) 1974-05-30
FI57741B (fi) 1980-06-30
SU656498A3 (ru) 1979-04-05
NO134110B (xx) 1976-05-10
DE2255106B2 (de) 1980-10-09
ZA727873B (en) 1974-06-26
AT328938B (de) 1976-04-12

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