WO1992018828A1 - Procede et dispositif d'amorçage de tubes non electriques - Google Patents

Procede et dispositif d'amorçage de tubes non electriques Download PDF

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Publication number
WO1992018828A1
WO1992018828A1 PCT/GB1992/000721 GB9200721W WO9218828A1 WO 1992018828 A1 WO1992018828 A1 WO 1992018828A1 GB 9200721 W GB9200721 W GB 9200721W WO 9218828 A1 WO9218828 A1 WO 9218828A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubing
nonel
spark
electrodes
bore
Prior art date
Application number
PCT/GB1992/000721
Other languages
English (en)
Inventor
Peter Christian Shann
Original Assignee
Explosive Developments Limited
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 Explosive Developments Limited filed Critical Explosive Developments Limited
Publication of WO1992018828A1 publication Critical patent/WO1992018828A1/fr

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Classifications

    • 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
    • F42D1/045—Arrangements for electric ignition
    • 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
    • F42B3/14—Spark initiators

Definitions

  • ⁇ is invention relates to detonating means .and, more particularly, to a method of .and apparatus for initiating the firing or detonation of a deflagratable or detonatable material, hereinafter referred to as "explosive" material.
  • nonel tubing which comprises a length of plastics tubing the bore of which is dusted or coated with an explosive material.
  • a flame and/or detonation front By firing the explosive material coating at one end of said nonel tubing a flame and/or detonation front, depending upon the nature of the dusting material, progresses very rapidly along the bore of the tubing and a flame/detonation front issues from the remote end of the tubing.
  • the flame/detonation front may directly fire a sensitive explosive material but for other materials the flame/detonation front will fire a primer in close contact with the explosive material.
  • nonel tubing generally has a bore diameter less than 3 nm., co ⁇ monly less than 2 mm and often smaller than 1.5 mm.
  • the prior art detonating means for .initiating the firing of "nonel" tubing generally comprises a percussion or the like detonation cap adjacent the open end of the nonel tubing and a mechanic-al or electrically operated means for firing the detonation cap.
  • a flame/detonation front generated by the cap is directed towards the bore of the nonel tubing to initiate detonation of the dusting material thereof.
  • Nonel tubing has the advantage in that it is inert with respect to the extr-an-e ⁇ us electric-al fields as may be found on, for example, quarry sites -and therefore offers substantial safety features over conventional electrical detonating systems, but the conventional nonel firing arrangements are, as described above, unreliable.
  • ⁇ ie present invention seeks to provide a method for detonating nonel tubing which is safe, reliable .and economical in use.
  • Acc ⁇ rddu ⁇ g to the present invention there is provided a method for .initiating detonation of a length of nonel tubing comprising the steps of generating a spark within the nonel tubing.
  • spark is .intended to mean -any fast, high energy output derived from an electrical discharge and includes the output obtained from an exploding bridge-wire or the like vaporizable device.
  • within when applied to the spark, is intended to mean that the spark is generated wholly or partially within the bore of the nonel tubing .and said term “within” is intended to exclude the effects of energy pulses generated by electrical discharges externally of the nonel tubing.
  • the method includes the steps o entering the ends of two separated electrodes into the bore o the nonel tubing and applying a high voltage potential acros said electrodes to generate said spark across the ends of sai electrodes.
  • the method includes the steps o introducing the separated electrodes, with their said end leading, into the nonel tubing through one open end thereof.
  • the method includes the steps of enterin the said two electrode ends into the bore of the nonel tubin through the wall of said tubing.
  • the method includes the steps o generating a spark in the nonel tubing by vaporizing filament element within the bore of said tubing .
  • the method includes the steps o introducing the said filament element into the bore of th nonel tubing through one end of said tubing.
  • the method includes the steps o introducing the filament element into the nonel tubing throug an opening in the wall of said tubing.
  • the method includes the steps of arrangin a fast discharge capacitor in the spark generating circuit an selecting the capacitor to discharge only at a voltage i excess of one thousand volts.
  • the method includes the steps of chargin the capacitor with a low voltage battery.
  • the method includes th steps of extending electrical signals from an electrica signal generating means at a safe location to a spar generating means between said safe location and an explosiv material to be detonated and arranging said spark generat.in means to generate a spark within the bore of a length of none tubing extend ⁇ g from said spark generating means to th explosive material to be detonated.
  • Such a method includes the steps o •arranging said electrical signal generating means to extend an electrical potential between 150 volts .and 200 volts to said spark generating me.ans.
  • the method includes the steps of f5 cc>nvert.ing the electrical potential received by said spark generating means to a voltage in excess of 1,000 volts within said spark generating means.
  • the present invention also envisages apparatus for .initiation detonation of a length of nonel tubing, cc ⁇ garising 0 means for generating a spark within the nonel tubing
  • said means comprise two electrodes, with ends .arranged to be entered into the bore of the nonel tubing, and me.ans for generating a spark across said electrodes.
  • the two electrodes comprise two generally parallel electrical conductors separated by an electrically insulating member.
  • ends of the said two electrodes are adapted to enter into the bore of the nonel 0 tubing through pre-formed openings in the side wall of said tubing.
  • the said electrodes have pointed tips and are forced through the wall of the nonel tubing to form their own passages of entry to said bore. 5
  • the two electrodes are preferably are entered into the bore of the nonel tubing from diametrically opposite directions.
  • the apparatus includes securing means for retaining the electrodes, in their wall penetrated positions, 0 with the nonel tubing.
  • the said electrodes are in the form of a coaxial cable with one electrode defining the centre core, a continuous sleeve of an electrically insulating material surrounding the core element, and the second electrode 5 in the form of a sleeve surrounding the electrically insulating sleeve and concentric with the core electrode.
  • the apparatus for initiating detonation of a n ⁇ nel tiibing comprises a filament element arranged to be inserted into the bore of the nonel tubing and means for vaporizing said filament element.
  • the said filament element is arranged to be introduc-sd into the bore of the nonel tiibing thr-ough one open end of the n ⁇ nel tiibing .
  • the filament element is arranged to be introduced into the bore of the n ⁇ nel tubing through an opening in the wall of said tubing.
  • the circuit means for generating a spark within the nonel tubing c ⁇ r ⁇ prises a fast discharge capacitor arranged to discharge at a voltage in excess of 1,000 volts.
  • the capacitor is arranged to be charged by a low voltage battery.
  • the means for generating a spark includes a transformer and the said capacitor is arranged to be charged by said transformer.
  • Fig. 1 shows, partially in longitudinal cross section, one means for initiating detonation of nonel tubing in accordance with the invention
  • Fig. 2 shows, partially in longitudinal cross section, a second arrangement for .initiating detonation of a nonel tubing
  • Fig. 3 shows, in longitudinal cross section, a third arrang-sment for initiating detonation of nonel tubing
  • Fig. 4 shows, diay aimiatically, a third circuit arrangement for generating a spark
  • Fig. 5 shows, diagranmatically, a detonation system in accordance with the -invention and,
  • Fig 6 shows a longitudinal cross-section through a further spark generating device in accordance with the invention.
  • a casing generally indicated by broken l.ine 11, presents a boss 12 with an aperture 13 therethrough.
  • the capacitor 20 is a fast discharge capacitor arranged to extend a discharge voltage of 3,000 volts through a switch 21 to the core electrode 15.
  • "Hie external electrode 17 extends into the casing 11 and is connected to a suitable earth connection within said casing 11.
  • ⁇ diode 22 is provided ⁇ n the casing 11 and arran-ged to illuminate when the capacitor 20 is charg-ad to its -dis-charge voltage.
  • One end of a length of nonel tiibing 23 is slideably inserted onto the coaxial cable 14 until the leading face 23a_ of the tubing 23 abuts the boss 12, whereupon the length of coaxial cable 14 extending from the boss 12 is fully inserted into the bore of the n ⁇ nel tiibing 23.
  • the boss 12 supports a leaf spring 24, with a beak end 24a on its end remote from the connection with boss 12 and directed towards the axis of the boss 12.
  • the beak 24a presents an incline surface 24b for engagement by the leading face 23ja of n ⁇ nel tubing 23 being axially displaced towards the boss 24, and which surface 24b when engaged by the end face 23a_ flexes the spring 24 to allow the beak 24a to be displaced out of the path of the tubing 23.
  • the capacitor 20 is charged to its predetermined discharge voltage, the ready condition of the capacitor 20 is indicated by illumination of the LED 22 and, thereafter, the operator has s.imply to actuate the manual switch 21 to discharge the capacitor 20 via the core electrode 15, the potential between the electrode 15 and the outer electrode 17 causes a spark between said electrodes 15 and 16 at the free end of the coaxial cable 14, and the spark initiates detonation of the explosive material dusting the bore of the nonel tubing 23, whereupon the n ⁇ nel tubing 23 detonates to discharge a flame/detonation front from that end of the n ⁇ nel tubing 23 remote from the casing 11.
  • the spring 24 can be flexed, conveniently by a thumb nail or a tool appli- ⁇ d to the inclined surface 24b, to displace the beak 24a_ out of the path of the fired nonel tubing 23, whereupon said spent tubing 23 can be removed from the coaxial cable 14.
  • the coaxial cable 14 can be of any desired length and, for many uses where the firing personnel can be in relatively close proximity to the explosive material to be detonated such as when detonating many deflagratable materials or small explosive material masses, the length of nonel tubing 23 can be relatively short.
  • the system can provide a roost reliable, safe and cheap method for effecting detonation.
  • a casing 31 contains a 1.5 volt battery 32, a voltage multiplier 33, a capacitor 34 and a manual switch 35.
  • the battery 32 extends electrical power to the voltage multiplier 33 which is directly connected to the capacitor 34 and the capacitor 34 is selected to discharge at a voltage of 3,000 volts.
  • a light emitting diode 36 is provided .in the casing 31 to illuminate when the capacitor 34 is fully charged.
  • Hie manual switch 35 when actuated, connects the capacitor 34 to a the first electrode 37 via a conductor 38 and an electrode 39 is rigidly supported in parallel, spaced- apart relationship with respect of the electrode 37 via an insulator 40.
  • An electrical conductor 41 connects the electrode 39 to an earth location within the cas.ing 31.
  • the electrodes 37 and 39 are of such length extending from the insulator 40 as to extend through the thickness of the wall defining a n ⁇ nel tubing 42 and into the bore of the nonel tiibing 42.
  • the lengths of the electrodes 37 and 39 are such that when the said electrodes 37 and 39 pass through the wall of the nonel tubing 42 .and the insulator 40 is in contact with the outer surface of the nonel 42 the tips of the electrodes 37 and 39 lie substanti-ally on the axis of the bore of the nonel tubing 42.
  • ⁇ ie electrodes 37 and 39 may pass through apertures pre-cut ⁇ n the wall of the n ⁇ nel tiibing 42 by a special tool or said apertures can be formed manually with a hand tool, such as an awl, or the tips of the electrodes 37 and 39 may be conical in form so as to form their own apertures through the wall of the nonel tubing 42 when the insulator 40 is forced towards the n ⁇ nel tiibing 42.
  • the insulator When the electrodes 37 and 39 have been fully inserted into the nonel tubing 42 the insulator may be secured to the nonel tubing 42 by a cord, tape or clamping ring 43. It will be seen that with this arrangement the electrodes 37 and 39 are connected to the casing 31 via the electrical conductors 38, 41, and which may be of any desired length.
  • the electrodes 37 and 39 may penetrate the wall of the n ⁇ nel tubing 42 close to one end of said tubing 42, for use when the n ⁇ nel tubing 42 is to detonate a single explosive material at the other end of the nonel 42, or the electrodes 37, 39 may penetrate the nonel tubing 42 at any desired location along the length of the nonel tubing 42 and the two ends of the n ⁇ nel tubing 42 may extend to two different explosive materials, whereupon the generation of a single spark across the electrodes 37 and 39 will detonate the nonel tubing 42 in both directions to detonate both -explosive materials substantially simultaneously.
  • the battery -32 discharges through the voltage multiplier 33 to charge the capacitor 34 and, when fully charged, the LED 36 illuminates to illustrate to the operator the ready condition of the electrical circuit. There-after, the operator has only to actuate the switch 35 to discharge the capacitor 34 whereupon to generate a spark across the electrodes 37, 39 to effect detonation of the n ⁇ nel tubing 42.
  • a collar 51 which may be of solid construction and threaded onto a nonel tubing 52 from one end thereof or made in two parts arranged to be secured together define the .annular collar 51 on a mid- length region of the n ⁇ nel tubing 52, presents two diametrically opposite threaded radial bores 53 and 54.
  • An electrode 55 has a threaded part 55a, engageable in the threaded bore 53, a head part 55b, which when engaged with the collar 51 limits the entry of the screw part 55a into the i U
  • an el-sctrode 56 includes a threaded part 56a engaged in the threaded bore 54, a head part 55b which limits the entry of the threaded part 56a_ into the threaded bore 54 and an electrode 56c_ extending from the threaded part 56a remote from the head part 55b.
  • electrodes 55c and 56c pass through apertures 57, 58 respectively in the wall of nonel tubing 52.
  • apertures 57, 58 may be formed by removing the electrodes 55 and 56 from their respective bores 53, 54, locating the sleeve 51 to the des.ired position along the length of the nonel tubing 52 and inserting screws, cooperable with thr-saded bores 53 and 54, and which screws present a cutter on their leading ends so that, by utilizing such cutter screws the apertures 57 and 58 can be cut through the wall 57 and 58 of the nonel tubing 52.
  • One of said cutter screws can then be removed and replaced by the appropriate electrode 55 or 56, the other cutting screw maintaining the axial positioning of the collar 51 on the n ⁇ nel tubing 52, and with the first electrode 55 or 56 inserted the second cutting s-crew can be removed and replaced by th**-* second electrode 55 or 56.
  • Fig. 3 can be fired by an arrangement identical with that ⁇ n Fig. 2, with the exception that the conductors 38 ad 41 will connect to the heads 55b, 56b in the Fig. 3 embodiment, and whereupon, on actuation of the switch 35 with the capacitor fully charged, a spark is g-snerated across the electrodes 55c_ -and 56c_ to detonate the n ⁇ nel tubing 52.
  • the coll.ar 51 may be located adjacent one end of a nonel tubing 52, to effect detonation of an explosive material at the end of nonel tubing 52 remote from the sleeve 51, or the sleeve 51 can be located on the n ⁇ nel tubing 52 at a mid-length position of said means 52, whereupon the two ends of the nonel tubing 52 can extend to an explosive material individual thereto and whereupon both explosive materials will be detonated substantially simultaneously.
  • the spark generating means is powered by -an external power source 61, and which may conveniently comprise a battery-powered electrical circuit delivering an electrical potential at between 150 and 200 volts to the spark generating means.
  • the powering circuit 61 extends potential signals via electrical conductors 62 and 63 to a transformer 64 within the spark generating circuit.
  • One output conductor 65 from the transformer extends directly to a spark generating electrode 66 and the other output side of the transformer 64 extends, via a lead 67, to a capacitor 68.
  • ⁇ ie output from capacitor 68 extends via a conductor 69 to a diode 70 and from diode 70 the potential is extended via a line 71 to the second spark generating electrode 72.
  • a conductor 73 including a diode 74, extends from the conductor 65 to the conductor 69.
  • a second capacitor 75 has one side connected to the conductor 65 via a conductor 76 and its other side connected to the conductor 71 via a conductor 77.
  • a resistance 78 is arranged in parallel with the capacitor 75.
  • the spark generating electrodes 66 and 72 may conveniently comprise a spark generating assembly identical with that shown in Fig. 2 (electrodes 37, 39 with insulator 40, ) or the assembly illustrated in Fig. 3 (the electrodes 55c, 56c ).
  • the capacitor 68 conveniently comprises a 2,000 volt capacitor
  • the capacitor 75 conveniently comprises a 3,000 volt capacitor
  • the diodes 70 and 74 conveniently comprise 3,000 volt, 8 -amp diodes.
  • the resistor 78 comprises a 3,000 volt resistor.
  • the circuit also includes a manual actuable switch 79 and a light emitting diode 80, .arranged to illuminate when the capacitor 75 is fully charged.
  • the capacitor 75 In operation, and with the supply circuit 61 supplying power to the transformer 64, the capacitor 75 becomes fully charged and the fully charged condition is visually displayed by the T.TD 80. With the circuit charged it is only necessary for the operator to actuate the manual switch 79 to discharge the capacitor 75, whereupon to generate a spark a-cross the electrodes 66.and 72.
  • a mass of explosive material 91 is arranged to be detonated by a primer 92.
  • a length of nonel tubing 93 extends from the pr.imer 92 to a spark device 94, which may be identical to the spark device 37, 39, 40, illustrated in Fig. 2 or the spark device 51 to 56 illustrated in Fig. 3, attached to the nonel tubing 93 remote from the primer 92.
  • ⁇ ie electrodes of the spark device 94 are c ⁇ nnf ⁇ t- ⁇ d by conductors 95 -and 96 to a spark generating circuit device 97, which may be identical to the spark generating device 32 to 36 illustrated in Fig. 2.
  • the only part of the apparatus which cannot be salvaged and re-used is the length of nonel tubing 93 between the primer 92 .and the spark device 94 and, as the spark device 94 is relatively robust, such length may be relatively short.
  • the spark device 94 is relatively simple and cheap, some operators may be prepared to sacrifice the spark device 94 in order to use a very short length of n ⁇ nel tubing 93.
  • the spark generating device 102 comprises an electrically insulating body 103 with an aperture 103a_ therethrough and a filament element 104 supported at both its ends in said body 103 with its mid-regions exposed through said aperture 103a_.
  • Ihe body 103 is secure at one end thereof to the radial end face 105a of a cylindrical body 105, the body
  • 105 is constructed from an electrically insulating material, and said body 105 has its cylindrical surface of such diameter as to constitute a relatively tight fit in the bore 101a of nonel tubing 101.
  • a first conductor 106 from a two conductor cable 107, extends through a bore 105b .in body 105 -and along a slot 103b in body 103 to an electrical connection with the end of filament element 104 remote from the body 105.
  • the second conductor 108 from cable 107 extends through a bore 105£ in body 105 to an electrical connection with the end of filament
  • a clamping band 109 may surround the nonel tubing to retain the body 105 securely in the bore 101a of the n ⁇ nel tubing 101.
  • the spark generating device illustrated in Fig. 6 may conveni- ⁇ ntly be substituted for the spark generating device in the system illustrated ⁇ n. Fig. 5. It will now be seen that the arr-angement proposed by the present invention, and wherein a spark is generated in the bore of a nonel tubing, is a most reliable method for firing a nonel tubing.
  • the power source may supply the spark generating means with relatively high voltages, conveniently in the region of 150 volts to 200 volts, so that voltages induced into the conductors between the power source and the spark generating means cannot fire the spark generating means, resulting in a very safe method for detonation.
  • the apparatus may include a plurality of spark generating devices in the n ⁇ nel tubing, .arranged to spark simultaneously or in succession, to ensure detonation of the nonel tiibing.
  • a single spark generating circuit can extend con-ductors to a plurality of spark generating devices, each associat-ed with a n ⁇ nel tubing indivi-dual thereto, and whereupon said spark generating devices can be arranged to spark simultaneously, or in succession, to cause detonation of a plurality of explosive masses.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

L'invention se rapporte à un procédé servant à provoquer la détonation d'un tube de détonation non electrique en produisant une étincelle à l'intérieur dudit tube, ainsi qu'à un dispositif de mise en application dudit procédé. Dans un mode de réalisation décriit, un câble coaxial (14), comprenant une électrode centrale (15) entourée par une gaine d'isolation électrique (16) et une deuxième électrode (17) entourant ladite gaine d'isolation électrique (16), est introduit dans le perçage situé à l'une des extrémités d'une longueur du tube non électrique (23) et une décharge électrique à travers les extrémités des électrodes (15, 17) situées à l'intérieur du tube non électrique (23) produit une étincelle à l'intérieur dudit tube (23), afin de provoquer la détonation et/ou déflagration du matériau de revêtement et/ou de poudrage du tube non électrique (23).
PCT/GB1992/000721 1991-04-20 1992-04-21 Procede et dispositif d'amorçage de tubes non electriques WO1992018828A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9108502.7 1991-04-20
GB919108502A GB9108502D0 (en) 1991-04-20 1991-04-20 Improvements in or relating to detonation means

Publications (1)

Publication Number Publication Date
WO1992018828A1 true WO1992018828A1 (fr) 1992-10-29

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ID=10693659

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/000721 WO1992018828A1 (fr) 1991-04-20 1992-04-21 Procede et dispositif d'amorçage de tubes non electriques

Country Status (3)

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AU (1) AU1546192A (fr)
GB (1) GB9108502D0 (fr)
WO (1) WO1992018828A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993023718A2 (fr) * 1992-05-21 1993-11-25 Explosive Developments Limited Moyen de declenchement electrique pour tube a onde de choc
FR2751065A1 (fr) * 1996-07-09 1998-01-16 Lacroix Soc E Dispositif de declenchement d'initiateurs de compositions pyrotechniques
EP0777102A3 (fr) * 1995-10-30 1998-01-28 Soosan Special Purpose Vehicle, Co., Ltd. Système de fragmentation de roche utilisant la méthode Gold-Schmidt
EP1309830A1 (fr) * 2000-08-09 2003-05-14 McCormick Selph, Inc. Systeme d'allumage lineaire
US7568429B2 (en) 2005-03-18 2009-08-04 Orica Explosives Technology Pty Ltd Wireless detonator assembly, and methods of blasting
EP2912403A4 (fr) * 2012-10-23 2016-06-22 Mas Zengrange Nz Ltd Récepteur à déclencheur à distance

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB652802A (en) * 1947-07-02 1951-05-02 Smitsvonk Nv A device for electrically igniting explosives
US3955505A (en) * 1950-05-31 1976-05-11 The United States Of America As Represented By The United States Energy Research And Development Administration Detonating apparatus
US4292896A (en) * 1979-05-31 1981-10-06 Cxa Ltd./Cxa Ltee Detonating device
US5052301A (en) * 1990-07-30 1991-10-01 Walker Richard E Electric initiator for blasting caps

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB652802A (en) * 1947-07-02 1951-05-02 Smitsvonk Nv A device for electrically igniting explosives
US3955505A (en) * 1950-05-31 1976-05-11 The United States Of America As Represented By The United States Energy Research And Development Administration Detonating apparatus
US4292896A (en) * 1979-05-31 1981-10-06 Cxa Ltd./Cxa Ltee Detonating device
US5052301A (en) * 1990-07-30 1991-10-01 Walker Richard E Electric initiator for blasting caps

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993023718A2 (fr) * 1992-05-21 1993-11-25 Explosive Developments Limited Moyen de declenchement electrique pour tube a onde de choc
WO1993023718A3 (fr) * 1992-05-21 1994-01-20 Explosive Dev Ltd Moyen de declenchement electrique pour tube a onde de choc
EP0777102A3 (fr) * 1995-10-30 1998-01-28 Soosan Special Purpose Vehicle, Co., Ltd. Système de fragmentation de roche utilisant la méthode Gold-Schmidt
FR2751065A1 (fr) * 1996-07-09 1998-01-16 Lacroix Soc E Dispositif de declenchement d'initiateurs de compositions pyrotechniques
EP1309830A1 (fr) * 2000-08-09 2003-05-14 McCormick Selph, Inc. Systeme d'allumage lineaire
EP1309830A4 (fr) * 2000-08-09 2005-02-09 Mccormick Selph Inc Systeme d'allumage lineaire
US7568429B2 (en) 2005-03-18 2009-08-04 Orica Explosives Technology Pty Ltd Wireless detonator assembly, and methods of blasting
EP2912403A4 (fr) * 2012-10-23 2016-06-22 Mas Zengrange Nz Ltd Récepteur à déclencheur à distance

Also Published As

Publication number Publication date
GB9108502D0 (en) 1991-06-05
AU1546192A (en) 1992-11-17

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