US3757697A - Remotely controlled blasting machine - Google Patents

Remotely controlled blasting machine Download PDF

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Publication number
US3757697A
US3757697A US00222761A US3757697DA US3757697A US 3757697 A US3757697 A US 3757697A US 00222761 A US00222761 A US 00222761A US 3757697D A US3757697D A US 3757697DA US 3757697 A US3757697 A US 3757697A
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assembly
energy storage
energy
storage means
voltage
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US00222761A
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E Phinney
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Bendix Corp
Unison Industries LLC
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Bendix Corp
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Assigned to IGNITION PRODUCTS CORPORATION reassignment IGNITION PRODUCTS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALLIED-SIGNAL INC.
Assigned to HOUSEHOLD COMMERCIAL FINANCIAL SERVICES, INC. reassignment HOUSEHOLD COMMERCIAL FINANCIAL SERVICES, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UNISON INDUSTRIES LIMITED PARTNERSHIP
Assigned to UNISON INDUSTRIES LIMITED PARTNERSHIP, 530 BLACKHAWK PARK AVE., ROCKFORD, ILLINOIS 61108, A DE. LIMITED PARTNERSHIP reassignment UNISON INDUSTRIES LIMITED PARTNERSHIP, 530 BLACKHAWK PARK AVE., ROCKFORD, ILLINOIS 61108, A DE. LIMITED PARTNERSHIP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: IGNITION PRODUCTS CORPORATION
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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
    • F42D1/045—Arrangements for electric ignition
    • F42D1/05—Electric circuits for blasting

Definitions

  • ABSTRACT A remotely controlled blasting machine for detonating explosives.
  • the blasting machine is divided into two modules which are the remote control module and the [52] US. Cl l02/70.2 R, 317/80, 320/1 energy Storage module
  • the energy storage module is [51] Int. Cl. F42c 13/00 located in close proximity to the blasting caps while the [58] Field of Search 320/1; 317/79, 80; lemote control module whieh detonates the blasting 102/702 22 caps is located at a safe distance from the explosion to protect the operator.
  • the remote control module in- [56] References C'ted eludes an indicator light which gives visual indication UNITED STATES PATENTS that the explosives are about to be detonated and a 3,288,068 11/1966 Jefferson et al. 102 702 A switch for pp the detonation of the e"plosives 3,704,393 11/1972 Digney, Jr. et al. 320/1 during the presence of the visual indication.
  • the blast- 3,255,366 6/1966 McNulty et al 317/80 ing machine may be placed close to the explosive de- 3,417,306 1968 a 1 1 320/1 vices to be detonated while the operator controls the 3,575,153 4/1971 Hardtrt 123/148 blasting machine from a safe distance 3,171,063 2/1965 Hutch1son et al. 317/80 2,933,653 4/1960 Carter 317/80 13 Claims, 2 Drawing Figures Patented Sept. 11, 1973 CD050 QZEE N ON w SQOE 401F200 m. .om m
  • This invention relates to an improved blasting machine for detonating blasting caps or the like.
  • the invention is more particularly related to an a-c powered blasting machine of capacitor discharge type that may be remotely controlled from a safe distance.
  • electrical systems for firing explosive devices include a source of power, a transformer for stepping up input voltage, a storage capacitor which is charged by power from the transformer, and a trigger circuit which allows the energy stored in the capacitor to discharge to fire an explosive device.
  • the energy stored in the capacitor is discharged through the explosive device by means of a triggering circuit which may be operated automatically or manually. Examples of such blasting devices may be found in U.S. Pat. No. 3,417,306 entitled Regulated Voltage Capacitor Discharge Circuit, to J. L. Knak, issued Dec. 17, 1968; and U.S. Pat. No. 3,275,884 entitled Electrical Apparatus for Generating Current Pulses", to L. H. Segall et al., issued Sept. 27, 1966.
  • blasting operations of the type requiring 150 blasting caps safety requires that the operator be positioned a considerable distance from the blasting caps.
  • a blasting machine therefore is located at a considerable distance from the blasting caps.
  • up to 90 percent of the energy stored in the blasting machine may be dissipated in the leads going to the blasting caps. Obviously such dissipation distracts from the total number of blasting caps that the machine can fire, and substantially increases the chances of dangerous misfires.
  • This invention provides a blasting machine that can be controlled from a distance so that shorter lead lines may be used between the blasting machine and the blasting caps whereby most of the energy stored in the blasting machine is discharged into the blasting caps and not dissipated by long lead wires.
  • This invention further provides a remotely controlled blasting machine that detonates explosives when it reaches a predetermined energy level.
  • This invention is a blasting machine characterized by a remote control module that is connected to a blaster module by only two wires.
  • the remote control module although connected only by two wires to the blaster module which is connected to one or more blasting caps, controls the energy transferred to a storage capacitor in the blaster module; gives visual indication when the capacitor is approaching a predetermined level at which the blasting caps will be detonated; and provides a switch for preventing the blasting caps from being detonated at any time prior to the capacitor reaching the predetermined energy level.
  • the blasting machine comprises two modules or assemblies.
  • the first assembly includes: a storage capacitor, a transformer and a trigger circuit for automatically discharging the capacitor when it reaches a predetermined voltage level.
  • the second assembly which is connected by only two wires to the first assembly, includes: an electrical circuit that produces a voltage proportional to the voltage on the storage capacitor located in the first assembly, the electrical circuit including an indicator light that illuminates when the storage capacitor in the second assembly is approaching the voltage at which the trigger circuit discharges the capacitor; and a switch for applying and removing the energy supplied to the second assembly.
  • Another object of this invention is to provide a novel blasting machine that allows the operator to place the energy storage portion of the blaster close to the explosives to be detonated, thereby obtaining a maximum transfer of energy from the energy storage device to the device for detonating the explosives while permitting the operator to control the discharge of the energy storage device from a considerable distance.
  • Another object of this invention is to provide a novel blasting machine that may be remotely controlled from a safe distance by a control module which is connected by only two wires to a blasting module which is connected to an explosive bridge wire device or the like.
  • Still another object of this invention is to provide a safe and reliable blasting apparatus which does not discharge its energy until a capacitor therein has reached a predetermined energy level.
  • FIG. 1 is a system block diagram of a blasting machine that utilizes the principles of this invention.
  • FIG. 2 is a schematic diagram of a preferred embodiment of the circuitry for a blasting machine shown in FIG. 1.
  • FIG. 1 illustrates a block diagram of a blasting machine which utilizes the principles of the invention.
  • the basic components of the system include a remote control module and a blaster module 20 which is connected to blasting caps or similar devices.
  • the control module 10 includes a charging circuit 2 and an indicator circuit 4.
  • the blaster module 20 includes: an energy storage circuit 3; and a firing circuit 7 which includes a pulse generator 5 that generates pulses when the energy storage circuit reaches a predetermined energy level and a trigger circuit 8 that permits the energy stored to be discharged through the load 9.
  • the charging circuit 2 receives standard 1 volt a-c power and transfers it to the energy storage circuit 3 of the blaster module 20.
  • the charging circuit 2 is preferably manually operable to permit or interrupt the IIS volt a-c power from passing through the control module 10 to the energy storage device 3.
  • the voltage indicator circuit 4 gives an audio or visual indication when the energy stored in the energy storage circuit 3 reaches a predetermined level.
  • the voltage indicator includes an indicator light that gives visual indication when the energy stored in the energy storage 3 reaches a predetermined energy level.
  • a distinct feature of the remote control module 10 is that it is connected to the blaster module by only two electrical wires. Therefore, the function of both supplying power to the blaster module 20 and indicating the energy level in the energy storage circuit 3 is accomplished by the same two electrical wires.
  • the energy storage circuit 3 is preferably a capacitor in combination with a transformer and rectifying circuit.
  • the purpose of the transformer is to step up the 115 volt input voltage.
  • a discharge resistor may be connected to the capacitor to discharge the energy that remains in the capacitor when the blasting machine is not in use.
  • the pulse generator circuit 5 is an electrical circuit that automatically generates a plurality of electrical pulses when the energy storage circuit 3 reaches a predetermined energy level.
  • the predetermined energy level may be fixed by design or by a manual control.
  • the pulse generator produces pulses which are applied to the trigger portion 8 of the firing circuit 7 to discharge the energy stored in the energy storage circuit 3 into the load 9.
  • the trigger circuit 8 may include a gaseous conductor of the 3-electrode type wherein the trigger electrode upon receiving one or more pulses from the pulse generator 5 allows the remaining two electrodes which are in series with the energy storage circuit 3 to conduct, thereby allowing the energy stored in circuit 3 to discharge into the load 9.
  • a preferred 3-eleetrode gaseous conductor is described in US. Pat. Application Docket No.
  • ELC 71/20 filed Sept. 27, l97l (serial number not received) entitled Three Electrode Triggered Spark Gap for Use in Blasting Machines," by l. E. Linkroum.
  • the blasting system shown in this figure will automatically discharge the energy stored in the energy storage circuit 3 when the energy reaches a predetermined value unless the charging circuit 2 of the remote control module 10 is open circuited before the energy storage circuit 3 can reach that predetermined energy level.
  • FIG. 2 is aschematic diagram of a preferred embodiment of a remotely controlled blasting machine that utilizes standard ll5 volt a-c power in combination with a transformer 151 and a bridge rectifier to charge the storage capacitor 160 which will be discharged to fire a blasting cap or other explosive bridge wire device or the like.
  • the dotted lines outlining portions of the circuitry indicate the remote control module assembly 10 which includes the charging circuit 2 and voltage indicator circuit 4 and the blaster module 20 which includes the energy storage circuit 3 and a firing circuit 7.
  • the charging circuit 2 of the remote control module assembly 10 includes: means for receiving l 15 volt a-c power 131, 132; one or more fuses 133, 134 to protect the circuitry from overload; a charging switch 135 for applying and removing power to the control module 10 and hence to blasting module 20; a current limiting network of resistors 111, 112, 113, 114, and a selector switch 116 which may be selectively positioned to a plurality of locations which will increase or decrease the current to the blaster module 20.
  • the output of the charging circuit 2 consists of only two wires 21, 22 which connect the remote module 10 to the blaster module 20.
  • These connecting wires 21, 22 vary in length from zero to 5,000 feet; therefore, the resistance or impedance associated with these leads can have a wide range of effects on the circuitry. Therefore, the function of the resistors 111-115 is to compensate for this effect by selecting the position of the switch 116 that matches the length of the wires 21, 22, thereby keeping the impedance associated with the leads 21, 22 and one of the resistors 1 1 1-115 fairly uniform. For example, this circuit is designed for a maximum lead length of 5,000 feet which corresponds to switch position A. Therefore, when shorter leads are used, which means a reduction in resistance, resistance is added to the circuit to keep the total circuit's resistance fairly uniform.
  • the circuit shown shows adjustment for leads with lengths in multiples of 1,000 feet, from 5,000 feet at point A to 0 feet at point B. Finer or coarser steps may be allowed for by increasing or decreasing the number and/or values of the resistors 111-115.
  • An alternate approach to this would be to have taps on the secondary winding of the'transforrner 119 to compensate for a particular lead length.
  • a continuously adjustable or tapped voltage divider to adjust the compensation voltage for different lead lengths.
  • the voltage indicator circuit 4 includes a voltage network that includes resistors 129, 120 and 121; transformer 119; capacitors 122, diodes 123, 124; and indicator light 118.
  • the transformer 119 is arranged so that the voltage at the secondary winding 126 is 180 degrees out of phase with the voltage across the control module output leads 21, 22.
  • 121 is a voltage indicator light 118 which illuminates when the voltage impressed thereon reaches a voltage proportional to the voltage across capacitor 160 in the blaster module 20.
  • Resistor 120 is preferably manually variable so that the indicator light 118 may be adjusted to illuminate at a plurality of selected voltage values.
  • the purpose of the indicator light 118 is to provide a warning to the operator of the blasting machine that the voltage on the capacitor 160 is nearing the voltage at which the blasting machine will fire. Therefore, the indicator circuit 4 remotely senses the voltage on the storage capacitor 160 and gives a visual and/or audible warning when the storage capacitor 160 voltage is within approximately 300 volts of the predetermined firing voltage.
  • resistor 129 produces avoItage that is proportional to the current flowing in the lead lines and the primary winding 150 of transformer 151.
  • the voltage across resistor 129 is impressed on the primary winding 128 of compensation transformer 1 19.
  • the voltage appearing across the secondary winding 126 of the compensation transformer 119 is therefore proportional to the voltage across resistor 129 and is 180 out of phase with the voltage across points A and E.
  • the turns ratio of windings 126 and 128 is chosen so that the voltage of winding 126 is equal to the resistance voltage drop of the lead lines at maximum length plus the resistance voltage drops in the power transformer 151. Since the voltage across the secondary winding 126 is 180 out of phase with the voltage applied to the blaster module 20 through lines 21 and 22, a resultant voltage is obtained across capacitor 122 that is proportional to the capacitor voltage 160 reflected at the primary winding 150 of the transformer 151. Therefore, this circuit arrangement provides a voltage on capacitor 122 that is proportional to the voltage on capacitor 160.
  • the energy storage circuit 3 includes a transformer 151; a bridge rectifying circuit which includes diodes 153, 154, 155, 156; a storage capacitor 160; and a discharge resistor 161.
  • the primary 150 of the transformer 151 receives the energy transmitted from the remote control module 10 through wires 21 and 22.
  • the secondary 152 of the transformer 151 is the input to the bridge rectifiers 153-156 that supplies the capacitor 160 with energy.
  • Resistor 161 is located in parallel with the capacitor 160 to drain off any charge that may remain on the capacitor 160 when the blaster module is not in use.
  • the maximum charge that can be obtained on capacitor 160 is about 6,000 volts.
  • voltages of this magnitude are not generally required and an additional voltage regulating circuit (not shown) may be added to limit the voltage across the capacitor 160.
  • the capacitor 160 can be charged to an energy level of 400 joules within 12 seconds.
  • the pulse generator 5 of the firing circuit 7 includes a 2-electrode spark discharge device 170, resistor 182, capacitor 181 and one winding 183 of a transformer 184.
  • the 2-electrode spark discharge device 170 will remain in a nonconducting state as long as the voltage on the storage capacitor 160 is less than the breakdown voltage of the spark discharge device 170.
  • the device conducts, allowing current to pass through capacitor 181 and the primary winding 183 of the transformer 184.
  • the voltage across the spark discharge device 170 decreases until the spark device 170 returns to the original nonconducting stage. At this time capacitor 181 then discharges through resistor 182.
  • the trigger circuit 8 of the firing circuit 7 includes a 3-electrode spark discharge device 180, the secondary winding 185 of the transformer 184 for raising the voltage of the pulses received from the pulse generator 5 and applying them to the trigger electrode of the spark discharge device 180 through resistor 186.
  • a 3-electrode spark gap discharge device 180 for raising the voltage of the pulses received from the pulse generator 5 and applying them to the trigger electrode of the spark discharge device 180 through resistor 186.
  • the circuit operates as follows: when the remote control module is plugged into a source of alternating current (standard 1 15 volts a-c applied at inputs 131) and switch is open, resistor 161 removes the energy stored in capacitor 160. When switch 135 is closed, current flows into the remote control module 10 and to the blaster module 20. As the capacitor voltage increases there is a corresponding increase in voltage across capacitor 122 and resistors 120 and 121. As the voltage across capacitor 160 approaches the breakdown potential of spark gap discharge device the voltage across resistors 120 and 121 is selected to be sufficient to cause the indicator light 118 to illuminate. At this point in time the operator knows the capacitor is about to discharge and detonate the explosives.
  • the operator may allow the discharge to occur or may open switch 135 which will stop the transfer of energy from the control module 10 to the capacitor 160 and begin the discharge of the energy stored in the capacitor 160 through resistor 161.
  • the pulse generating circuit begins generating trigger pulses. This occurs when the spark gap discharge device 170 reaches its breakdown potential. Meanwhile, the indicator light 118 has been and is still illuminated.
  • trigger pulses are applied to transformer 184 causing spark gap device 180 to conduct, thereby allowing the energy in capacitor 160 to discharge into the blasting caps (not shown) attached to the outputs 190 and detonate explosives.
  • the blasting machine described in FIG. 2 was powered by standard 1 15 volt a-c and the circuit elements had the values or were of the types indicated below:
  • a first assembly which comprises:
  • a first transformer means having a primary winding and a secondary winding, said secondary winding being connected in electrical circuit relationship with said energy storage means;
  • said second assembly including:
  • said means for indicating when said energy storage means is approaching said predetermined energy level including:
  • circuit means for indicating the voltage at the primary winding of said first transformer
  • circuit means for producing a second alternating voltage which is equal to but out of phase with said alternating voltage received by said second assembly
  • blasting machine for detonating blasting caps, said blasting machine comprising:
  • a first assembly which comprises:
  • a first transformer means having a primary winding and a secondary winding, said secondary winding being connected in electrical circuit relationship with said energy storage means;
  • said second assembly including:
  • said first and second assemblies being electrically connected by only two wires
  • said means for indicating when said energy storage means is approaching said predetermined energy level including:
  • circuit means for indicating the voltage at the primary winding of said first transformer
  • circuit means for producing a second alternating voltage which is equal to but 180 degrees out of phase with said alternating voltage received by said second assembly;
  • said second assembly includes switching means operable to prevent the transfer of energy to said energy storage means from said second assembly whereby an operator may interrupt the transfer of energy to said energy storage means and prevent said blasting caps from being detonated.
  • said second assembly includes switching means operable to prevent the transfer of energy to said energy storage means from said second assembly whereby an operator may interrupt the transfer of energy to said energy storage means and prevent said blasting caps from being detonated.
  • a blasting machine as recited in claim 1 wherein said means for indicating when said energy storage means is approaching said predetermined energy level includes:
  • circuit means for producing a voltage proportional to the energy level of the energy storage means, said circuit means including:
  • a second transformer having a primary winding and a secondary winding and operable to produce an alternating voltage at the secondary winding thereof that is 180 degrees out of phase with the voltage applied to the primary winding of said first transformer:
  • an indicator circuit responsive to the voltages produced at the secondary winding of said second transformer, said circuit having means for adjusting said indicator to provide an indication at a plurality of selected energy levels below said predetermined energy levels at which said energy storage means discharges and detonates said blasting caps.
  • a blasting machine as recited in claim 2 wherein said means for indicating when said energy storage means is approaching said predetermined energy level includes:
  • circuit means for producing a voltage proportional to the energy level of the energy storage means, said circuit means including:
  • a second transformer having a primary winding and a secondary winding and operable to produce an alternating voltage at the secondary winding thereof that is 180 degrees out of phase with the voltage applied to the primary winding of said first transformer;
  • a blasting machine which comprises:
  • a first assembly which comprises:
  • a first transformer means having a primary winding and a secondary winding, said secondary winding being connected in electrical circuit relationship with said energy storage means;
  • said second assembly including:
  • switching means operable to stop the transfer of energy to said energy storage means from said second assembly.
  • a blasting machine which comprises:
  • At least one electro-explosive device At least one electro-explosive device
  • a first assembly which comprises:
  • said second assembly including:
  • said second assembly includes switching means operable to stop the application of energy to said first assembly whereby an operator of said blasting machine having an indication that said blasting caps are about to be detonated may prevent detonation of said blasting caps by operation of said switching means.

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851589A (en) * 1973-04-25 1974-12-03 Texaco Inc Electronic delay blaster
US3893013A (en) * 1972-06-01 1975-07-01 Bovard & Cie Electric discharge machining circuit incorporating means for pre-ignition of the discharge channel
US3898514A (en) * 1972-05-30 1975-08-05 Ricoh Kk Strobo discharge device with audio signal generator
DE3511075A1 (de) * 1985-03-27 1986-10-02 Westfälische Berggewerkschaftskasse, 4630 Bochum Handgeraet zur elektrischen pruefung von zuendmaschinen, insbesondere in schlagwettersicherer ausfuehrung, vorzugsweise fuer den untertagebetrieb
EP0241151A1 (en) * 1986-04-10 1987-10-14 Ici Australia Limited Blasting apparatus
EP0274231A1 (en) * 1986-12-10 1988-07-13 Nippon Oil And Fats Company, Limited Method of electrically blasting a plurality of detonators and electric blasting apparatus for use in said method
AU585701B2 (en) * 1986-04-10 1989-06-22 Ici Australia Limited Blasting method
US4960183A (en) * 1985-08-16 1990-10-02 Exxon Production Research Company Seismic source firing control system
US5146104A (en) * 1988-08-26 1992-09-08 Robert Bosch Gmbh Electronic device for triggering a safety device
EP0651229A2 (en) * 1993-09-01 1995-05-03 Schlumberger Limited Firing system for a perforating gun including an exploding foil detonator
US5641935A (en) * 1995-08-16 1997-06-24 The United States Of America As Represented By The Secretary Of The Army Electronic switch for triggering firing of munitions
US7021218B2 (en) * 2002-11-21 2006-04-04 The Regents Of The University Of California Safety and performance enhancement circuit for primary explosive detonators
CN101964140A (zh) * 2010-09-29 2011-02-02 山东隆泰矿业设备有限公司 具有联锁和自动加压功能的遥控放炮装置
EP1488190B1 (en) * 2002-03-11 2014-05-14 Detnet South Africa (Pty) Ltd Detonator system and method in connection with the same
US9939235B2 (en) 2013-10-09 2018-04-10 Battelle Energy Alliance, Llc Initiation devices, initiation systems including initiation devices and related methods
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US11577287B1 (en) 2018-04-16 2023-02-14 AGI Engineering, Inc. Large riser extended reach sluicer and tool changer

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DE3342818A1 (de) * 1983-11-26 1985-06-05 kabelmetal electro GmbH, 3000 Hannover Schaltungsanordnung und verfahren zum ausloesen einer sprengladung

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US3171063A (en) * 1962-07-20 1965-02-23 Jersey Prod Res Co Remote trigger arrangement for blaster
US3255366A (en) * 1960-11-25 1966-06-07 Gen Lab Associates Inc Pulse forming apparatus
US3288068A (en) * 1964-04-30 1966-11-29 Donald E Jefferson Triggered exploding wire device
US3337755A (en) * 1964-04-10 1967-08-22 Gen Electric Pulse generator
US3417306A (en) * 1965-02-09 1968-12-17 Bendix Corp Regulated voltage capacitor discharge circuit
US3575153A (en) * 1968-11-18 1971-04-20 Eltra Corp Regulated voltage converter
US3704393A (en) * 1971-12-30 1972-11-28 Frank J Digney Jr Capacitor discharge type blasting machines

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Publication number Priority date Publication date Assignee Title
US2933653A (en) * 1955-02-04 1960-04-19 Du Pont Blasting machine
US3255366A (en) * 1960-11-25 1966-06-07 Gen Lab Associates Inc Pulse forming apparatus
US3171063A (en) * 1962-07-20 1965-02-23 Jersey Prod Res Co Remote trigger arrangement for blaster
US3337755A (en) * 1964-04-10 1967-08-22 Gen Electric Pulse generator
US3288068A (en) * 1964-04-30 1966-11-29 Donald E Jefferson Triggered exploding wire device
US3417306A (en) * 1965-02-09 1968-12-17 Bendix Corp Regulated voltage capacitor discharge circuit
US3575153A (en) * 1968-11-18 1971-04-20 Eltra Corp Regulated voltage converter
US3704393A (en) * 1971-12-30 1972-11-28 Frank J Digney Jr Capacitor discharge type blasting machines

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898514A (en) * 1972-05-30 1975-08-05 Ricoh Kk Strobo discharge device with audio signal generator
US3893013A (en) * 1972-06-01 1975-07-01 Bovard & Cie Electric discharge machining circuit incorporating means for pre-ignition of the discharge channel
US3851589A (en) * 1973-04-25 1974-12-03 Texaco Inc Electronic delay blaster
DE3511075A1 (de) * 1985-03-27 1986-10-02 Westfälische Berggewerkschaftskasse, 4630 Bochum Handgeraet zur elektrischen pruefung von zuendmaschinen, insbesondere in schlagwettersicherer ausfuehrung, vorzugsweise fuer den untertagebetrieb
US4960183A (en) * 1985-08-16 1990-10-02 Exxon Production Research Company Seismic source firing control system
EP0241151A1 (en) * 1986-04-10 1987-10-14 Ici Australia Limited Blasting apparatus
AU585701B2 (en) * 1986-04-10 1989-06-22 Ici Australia Limited Blasting method
EP0274231A1 (en) * 1986-12-10 1988-07-13 Nippon Oil And Fats Company, Limited Method of electrically blasting a plurality of detonators and electric blasting apparatus for use in said method
US4848232A (en) * 1986-12-10 1989-07-18 Nippon Oil And Fats Company, Limited Method of electrically blasting a plurality of detonators and electric blasting apparatus for use in said method
US5146104A (en) * 1988-08-26 1992-09-08 Robert Bosch Gmbh Electronic device for triggering a safety device
EP0651229A2 (en) * 1993-09-01 1995-05-03 Schlumberger Limited Firing system for a perforating gun including an exploding foil detonator
EP0651229A3 (en) * 1993-09-01 1995-11-02 Schlumberger Ltd Ignition system for perforated perforator, this ignition system having an explosive foil-encompassing detonator.
US5641935A (en) * 1995-08-16 1997-06-24 The United States Of America As Represented By The Secretary Of The Army Electronic switch for triggering firing of munitions
EP1488190B1 (en) * 2002-03-11 2014-05-14 Detnet South Africa (Pty) Ltd Detonator system and method in connection with the same
US7021218B2 (en) * 2002-11-21 2006-04-04 The Regents Of The University Of California Safety and performance enhancement circuit for primary explosive detonators
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Also Published As

Publication number Publication date
GB1423303A (en) 1976-02-04
CA950527A (en) 1974-07-02
DE2305252A1 (de) 1973-08-09
FR2170164A1 (US07122603-20061017-C00045.png) 1973-09-14
IT978714B (it) 1974-09-20

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