US3878786A - Safety detonator device for detonating fusecord - Google Patents

Safety detonator device for detonating fusecord Download PDF

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Publication number
US3878786A
US3878786A US428699A US42869973A US3878786A US 3878786 A US3878786 A US 3878786A US 428699 A US428699 A US 428699A US 42869973 A US42869973 A US 42869973A US 3878786 A US3878786 A US 3878786A
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Prior art keywords
housing
charge
aperture
detonating
initiating
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US428699A
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John Jerold Ridgeway
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EXPLO RIDGEWAY INTERNATIONAL L
EXPLO-RIDGEWAY INTERNATIONAL Ltd
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EXPLO RIDGEWAY INTERNATIONAL L
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Priority to US428699A priority Critical patent/US3878786A/en
Priority to DE2458696A priority patent/DE2458696C3/en
Priority to NO744538A priority patent/NO744538L/no
Priority to CA216,745A priority patent/CA1017625A/en
Priority to FR7442858A priority patent/FR2256392B3/fr
Application granted granted Critical
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    • 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
    • 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
    • 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
    • F42B3/195—Manufacture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
    • F42B39/30—Containers for detonators or fuzes
    • 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

Definitions

  • This invention relates to a safety detonator device for initiating detonating fusecord. in which device the initiating explosive charge is enclosed in a safety housing capable of confining theexplosive force consequent on premature ignition of the said explosive charge.
  • Detonating fusecord is widely used as a detonation transmission line in blasting operations and is commercially available, for example, under the names Primacord and Cordtex (Registered Trade Marks). It is normally detonated by means of a commercial blasting cap containing a charge of initiating explosive and. op tionally, a booster charge. These blasting caps are capable of causing grievous harm to personnel if they are accidentally ignited during handling. and for that reason, storage, handling and transporting of blasting caps is strictly controlled. Compliance with the regulations causes long delays in transporting and often precludes the timely and/or economical performance of certain blasting contracts.
  • a further object is to provide a convenient detonator device which is safer to store, transport and handle than the conventional blasting cap.
  • a detonator device for initiating detonating fusecord comprises a closed elongated housing having at one end a charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge, and having in its other end an aperture through which an end of a length of detonating cord may be inserted into position in the housing for initiation by the said explosive charge.
  • said aperture being closed by a movable valve element which is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing, the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation of the said charge of initiating explosive.
  • the aperture is formed axially in a plug located in the end of the housing and the valve element is a flap seated on the inner face of said plug over said aperture, the said inner face preferably being inclined to the aperture axis to facilitate the insertion of the fusecord.
  • the flap is preferably biassed towards the aperture and the biassing means may, for example, comprise a spring such as, for example, a strip of phosphor bronze, spring steel or beryllium-copper.
  • the flap is located with respect to the housing by means of a hinge of spring strip material.
  • the said plug and flap may conveniently be metal or plastics material such as nylon, polyethylene, polypropylene, polyvinyl chloride or the like.
  • the flap may be formed with a sharp edge arranged to resist withdrawal of the detonating cord from the housing by biting into the side of the cord.
  • the charge of initiating explosive composition and ignition means may conveniently be those used conventionally in blasting caps.
  • a small charge of compressed lead azide and an electric fusehead in train therewith may be located in the end of the housing with the electrical leads from the fusehead emerging through the end closure.
  • the minimum charge of lead azide required reduces with the degree of compaction so it is advantageous to use a highly compressed charge of lead azide.
  • FIG. 1 is a diagrammatical longitudinal section of a detonator device of the invention
  • FIG. 2 is a diagrammatical longitudinal section of the device of FIG. I with a length of detonating fusecord in position for detonation.
  • the device comprises of a charge of initiating explosive composition 10 compressed in the base of a metal cup 11 in which an electric fusehead l2 enclosed in a plastics sleeve 13 is juxtaposed to the explosive charge 10.
  • the cup 11 is inserted to an intermediate position in a metal tube 14 where it abuts an internally bevelled guide bush 15 located in one end of the tube I4 and electrical conductor wires 16 connected to the fusehead l2 are trained through a perforated plug of elastomer I7 in the other end of the tube 14, which is crimped around the plug 17.
  • the guide bush I5 is. at its narrow internal dimension adapted to accommodate, as a sliding fit, an end length of detonating fusecord.
  • the fusehead l2, sleeve 13, cup 11 and metal tube 14 are bonded together by a cement composition 18.
  • the bushed tube I4 is inserted as a sliding fit cement bonded into one end of a tubular housing 19 and the end of housing 19 is crimped around the crimped end of tube 14.
  • An end plug 20 is located as a tight fit in the other end of housing l9 and the end of the housing is swaged as a plug retaining lip 21 over the end of plug 20.
  • the plug 20 is formed with an axial aperture 22 through which a length of detonating fusecord may be readily inserted, and its inner end face is inclined to the longitudinal axis.
  • the inner end of the aperture 22 is covered with a flap valve member 23 which (in FIG. 1) seats on the inner face of the plug 20.
  • the valve member 23 is located by a strip spring member 24 which has one end connected to the valve member 22 and the other fixed between the plug 20 and the housing 19.
  • an end length of the fusecord 25 is inserted through the aperture 22, pushing aside the valve member 23 and into the guide bush 15 to contact the end of cup 11, as shown in FIG. 2.
  • the plug 20 valve member 23 and spring member 24 are inserted into the flanged end of tube 14 or alternatively the plug 20 may be inserted before the plug retaining lip 21 is formed.
  • the metal tube 14 and its contents are conveniently first constructed and assembed as a conventional detonating cord blasting cap and the open end of the tube 14 is subsequently inserted and cemented in the housing I9.
  • the housing and its closures must be sufficiently strong to withstand the explosive force from detonation of the initiating explosive but it will be understood that the material and dimensions thereof used in theconstruction of the device may be widely varied. However. the optimum parameters can readily bedetermined by straight forwardexperiment. I
  • the explosive charge 10 is one grain (0.065 gram) of lead azide pressed in an aluminium cup 11 having an internal diameter of 0.25 inch and a wall thickness of 0.028.
  • the tube 14 and housing 18 are of 0.028 inch thick aluminium, the housing being 0.5 inch diameter and 5 inches long.
  • the cement composition 17 is a silicone cement.
  • the plug 19 is an aluminium bush having an aperture 0.22 inch diameter and the valvemember is a 0. l 5 inch nylon disc in which a phosphor, bronze strip is moulded.
  • a detonator device for initiating detonating fusecord comprising a closed elongated housing having at one end a, charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge. and having in its other end an aperture through which an end of a length of detonating cord may be inserted .into position in the housing for initiation by the said explosive charge.
  • said aperture being closed by an internally movable valve element which is arranged to be forced to a closed position by the force of said charge if accidentally detonatedandwhich is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing.
  • the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation. of the said charge of initiating explosive.
  • biassing means comprises a spring
  • a device as claimed in claim 5 wherein the spring comprises a strip of material selected from the group consisting of phosphor-bronze, spring steel and beryllium-copper 7.
  • the flap is located with respect to the housing by means of a hinge of spring strip material.
  • a device as claimed in claim 2 wherein the flap is made from a member of the group consisting of metal and plastics materials.
  • a device as claimed in claim 8 wherein the flap is made from a plastics material selected from the group consisting of nylon. polyethylene. polypropylene and polyvinyl chloride.
  • a device as claimed in claim 1 wherein the charge of initiating explosive composition comprises lead azide.
  • a device as claimed in claim 11 wherein the .iarge of initiating explosive composition consists of about 1 grain of compressed lead azide.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Air Bags (AREA)
  • Lighters Containing Fuel (AREA)

Abstract

A detonator for detonating fusecord in which the initiating explosive charges are at one end of a closed elongated housing, the other end of the housing having an aperture closed by a movable valve element, for example a flap valve, which is displaceable to permit an end length of detonating cord to be inserted into contact with the initiating explosive charge and the housing is sufficiently strong to confine the explosion pressure in the event of premature detonation of the initiating explosive charge.

Description

United States Patent 1 Ridgeway [451 Apr. 22, 1975 SAFETY DETONATOR DEVICE FOR DETONATING FUSECORD [75] Inventor:
[73] Assignee: Explo-Ridgeway International Limited, St. Heliers. J ersey, Channel Islands 221 Filed: Dec.27,l973
211 Appl.No.:428.699
John Jerold Ridgeway, Paris. France [52] US. Cl. 102/27 R; l02/28 R; l02/27 F [5 l] Int. Cl. C06c 5/06 [58] Field of Search 102/27, 28
[56] References Cited UNITED STATES PATENTS 3.188.9l4 6/1965 Dahl 102/28 3.739.724 6/1973 Tlam 102/28 Primary E.\'aminer-Verlin R. Pendegrass Attorney. Agent. or Firm-Cushman, Darby &
Cushman [57] ABSTRACT 12 Claims. 2 Drawing Figures PATENTEUAPR22|915 FIG. 2
FIG. I
SAFETY DETONATOR DEVICE FOR DETONATING FUSECORD This invention'relates to a safety detonator device for initiating detonating fusecord. in which device the initiating explosive charge is enclosed in a safety housing capable of confining theexplosive force consequent on premature ignition of the said explosive charge.
Detonating fusecord is widely used as a detonation transmission line in blasting operations and is commercially available, for example, under the names Primacord and Cordtex (Registered Trade Marks). It is normally detonated by means of a commercial blasting cap containing a charge of initiating explosive and. op tionally, a booster charge. These blasting caps are capable of causing grievous harm to personnel if they are accidentally ignited during handling. and for that reason, storage, handling and transporting of blasting caps is strictly controlled. Compliance with the regulations causes long delays in transporting and often precludes the timely and/or economical performance of certain blasting contracts.
There is therefore a demand for a detonator device for detonating cord which is safeguarded against the effects of premature ignition so that it may be safely transported by air and be generally safer to store and handle and also easy to connect to detonating cord.
Thus, it is an object of the present invention to improve the blasting caps for detonating cord to overcome the hazards associated with accidental ignition of the caps. A further object is to provide a convenient detonator device which is safer to store, transport and handle than the conventional blasting cap.
A detonator device for initiating detonating fusecord comprises a closed elongated housing having at one end a charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge, and having in its other end an aperture through which an end of a length of detonating cord may be inserted into position in the housing for initiation by the said explosive charge. said aperture being closed by a movable valve element which is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing, the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation of the said charge of initiating explosive.
Conveniently, the aperture is formed axially in a plug located in the end of the housing and the valve element is a flap seated on the inner face of said plug over said aperture, the said inner face preferably being inclined to the aperture axis to facilitate the insertion of the fusecord. The flap is preferably biassed towards the aperture and the biassing means may, for example, comprise a spring such as, for example, a strip of phosphor bronze, spring steel or beryllium-copper. In a preferred embodiment the flap is located with respect to the housing by means of a hinge of spring strip material. The said plug and flap may conveniently be metal or plastics material such as nylon, polyethylene, polypropylene, polyvinyl chloride or the like. Advantageously. the flap may be formed with a sharp edge arranged to resist withdrawal of the detonating cord from the housing by biting into the side of the cord.
The charge of initiating explosive composition and ignition means may conveniently be those used conventionally in blasting caps. Thus, a small charge of compressed lead azide and an electric fusehead in train therewith may be located in the end of the housing with the electrical leads from the fusehead emerging through the end closure. The minimum charge of lead azide required reduces with the degree of compaction so it is advantageous to use a highly compressed charge of lead azide.
The invention is further illustrated by the preferred embodiment which is hereinafter described by way of example only, with reference to the accompanying drawings wherein:
FIG. 1 is a diagrammatical longitudinal section of a detonator device of the invention FIG. 2 is a diagrammatical longitudinal section of the device of FIG. I with a length of detonating fusecord in position for detonation.
The device comprises of a charge of initiating explosive composition 10 compressed in the base of a metal cup 11 in which an electric fusehead l2 enclosed in a plastics sleeve 13 is juxtaposed to the explosive charge 10. The cup 11 is inserted to an intermediate position in a metal tube 14 where it abuts an internally bevelled guide bush 15 located in one end of the tube I4 and electrical conductor wires 16 connected to the fusehead l2 are trained through a perforated plug of elastomer I7 in the other end of the tube 14, which is crimped around the plug 17. The guide bush I5 is. at its narrow internal dimension adapted to accommodate, as a sliding fit, an end length of detonating fusecord. The fusehead l2, sleeve 13, cup 11 and metal tube 14 are bonded together by a cement composition 18.
The bushed tube I4 is inserted as a sliding fit cement bonded into one end of a tubular housing 19 and the end of housing 19 is crimped around the crimped end of tube 14. An end plug 20 is located as a tight fit in the other end of housing l9 and the end of the housing is swaged as a plug retaining lip 21 over the end of plug 20. The plug 20 is formed with an axial aperture 22 through which a length of detonating fusecord may be readily inserted, and its inner end face is inclined to the longitudinal axis. The inner end of the aperture 22 is covered with a flap valve member 23 which (in FIG. 1) seats on the inner face of the plug 20. The valve member 23 is located by a strip spring member 24 which has one end connected to the valve member 22 and the other fixed between the plug 20 and the housing 19.
In the unlikely event of the initiating explosive charge 10 being accidentally detonated the explosive force tends to close the valve member 23 against its seat and the force is thereby contained within the housing 19.
In use for initiation of detonating fusecord, an end length of the fusecord 25 is inserted through the aperture 22, pushing aside the valve member 23 and into the guide bush 15 to contact the end of cup 11, as shown in FIG. 2.
In the assembly of the device the plug 20 valve member 23 and spring member 24 are inserted into the flanged end of tube 14 or alternatively the plug 20 may be inserted before the plug retaining lip 21 is formed. The metal tube 14 and its contents are conveniently first constructed and assembed as a conventional detonating cord blasting cap and the open end of the tube 14 is subsequently inserted and cemented in the housing I9.
The housing and its closures must be sufficiently strong to withstand the explosive force from detonation of the initiating explosive but it will be understood that the material and dimensions thereof used in theconstruction of the device may be widely varied. However. the optimum parameters can readily bedetermined by straight forwardexperiment. I
. As an example. in one construction of the device the explosive charge 10 is one grain (0.065 gram) of lead azide pressed in an aluminium cup 11 having an internal diameter of 0.25 inch and a wall thickness of 0.028. The tube 14 and housing 18 are of 0.028 inch thick aluminium, the housing being 0.5 inch diameter and 5 inches long. The cement composition 17 is a silicone cement. The plug 19 is an aluminium bush having an aperture 0.22 inch diameter and the valvemember is a 0. l 5 inch nylon disc in which a phosphor, bronze strip is moulded.
What is claimed is:
l. A detonator device for initiating detonating fusecord comprising a closed elongated housing having at one end a, charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge. and having in its other end an aperture through which an end of a length of detonating cord may be inserted .into position in the housing for initiation by the said explosive charge. said aperture, being closed by an internally movable valve element which is arranged to be forced to a closed position by the force of said charge if accidentally detonatedandwhich is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing. the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation. of the said charge of initiating explosive. if
2. A device as'claimed in claim 1 wherein aplug defining an axial apertureis locatedin said other end of the housing and the valve element comprises a flap seatedover said aperture on the inner face of said plug.
3. A device as.claimed in .claim lwherein the inner face of the plug is inclined to the.ax,is. v. i W
4. A device as claimedin claim 'Z wherein the flap is biassed towards said aperture. 7
5. A device as claimed in claim 4 wherein the biassing means comprises a spring,
6. A device as claimed in claim 5 wherein the spring comprises a strip of material selected from the group consisting of phosphor-bronze, spring steel and beryllium-copper 7. A device as claimed in claim 2 wherein the flap is located with respect to the housing by means of a hinge of spring strip material.
8. A device as claimed in claim 2 wherein the flap is made from a member of the group consisting of metal and plastics materials.
9. A device as claimed in claim 8 wherein the flap is made from a plastics material selected from the group consisting of nylon. polyethylene. polypropylene and polyvinyl chloride.
10. A device as claimed in claim 2 wherein the flap is formed with a sharp edge arranged to resist withdrawal of the detonating fusecord from the housing.
11. A device as claimed in claim 1 wherein the charge of initiating explosive composition comprises lead azide.
12. A device as claimed in claim 11 wherein the .iarge of initiating explosive composition consists of about 1 grain of compressed lead azide.
ill

Claims (12)

1. A detonator device for initiating detonating fusecord comprising a closed elongated housing having at one end a charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge, and having in its other end an aperture through which an end of a length of detonating cord may be inserted into position in the housing for initiation by the said explosive charge, said aperture being closed by an internally movable valve element which is arranged to be forced to a closed position by the force of said charge if accidentally detonated and which is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing, the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation of the said charge of initiating explosive.
1. A detonator device for initiating detonating fusecord comprising a closed elongated housing having at one end a charge of initiating explosive composition capable of initiating detonating fusecord and ignition means for igniting said charge, and having in its other end an aperture through which an end of a length of detonating cord may be inserted into position in the housing for initiation by the said explosive charge, said aperture being closed by an internally movable valve element which is arranged to be forced to a closed position by the force of said charge if accidentally detonated and which is displaceable from the aperture to permit an end length of detonating cord to be inserted into the housing, the closed housing being sufficiently strong to confine the explosion energy in the event of premature detonation of the said charge of initiating explosive.
2. A device as claimed in claim 1 wherein a plug defining an axial aperture is located in said other end of the housing and the valve element comprises a flap seated over said aperture on the inner face of said plug.
3. A device as claimed in claim 2 wherein the inner face of the plug is inclined to the axis.
4. A device as claimed in claim 2 wherein the flap is biassed towards said aperture.
5. A device as claimed in claim 4 wherein the biassing means comprises a spring
6. A device as claimed in claim 5 wherein the spring comprises a strip of material selected from the group consisting of phosphor-bronze, spring steel and beryllium-copper
7. A device as claimed in claim 2 wherein the flap is located with respect to the housing by means of a hinge of spring strip material.
8. A device as claimed in claim 2 wherein the flap is made from a member of the group consisting of metal and plastics materials.
9. A device as claimed in claim 8 wherein the flap is made from a plastics material selected from the group consisting of nylon, polyethylene, polypropylene and polyvinyl chloride.
10. A device as claimed in claim 2 wherein the flap is formed with a sharp edge arranged to resist withdrawal of the detonating fusecord from the housing.
11. A device as claimed in claim 1 wherein the charge of initiating explosive composition comprises lead azide.
US428699A 1973-12-27 1973-12-27 Safety detonator device for detonating fusecord Expired - Lifetime US3878786A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US428699A US3878786A (en) 1973-12-27 1973-12-27 Safety detonator device for detonating fusecord
DE2458696A DE2458696C3 (en) 1973-12-27 1974-12-11 Detonators for detonating cords
NO744538A NO744538L (en) 1973-12-27 1974-12-16
CA216,745A CA1017625A (en) 1973-12-27 1974-12-23 Safety detonator device for detonating fusecord
FR7442858A FR2256392B3 (en) 1973-12-27 1974-12-26

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US428699A US3878786A (en) 1973-12-27 1973-12-27 Safety detonator device for detonating fusecord

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US3878786A true US3878786A (en) 1975-04-22

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CA (1) CA1017625A (en)
DE (1) DE2458696C3 (en)
FR (1) FR2256392B3 (en)
NO (1) NO744538L (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132171A (en) * 1974-11-04 1979-01-02 Pawlak Daniel E Apparatus for detonating an explosive charge
US4292895A (en) * 1979-10-09 1981-10-06 Schlumberger Technology Corporation Explosive safe-arming apparatus for perforating guns
US4311096A (en) * 1980-05-05 1982-01-19 Atlas Powder Company Electronic blasting cap
US4335652A (en) * 1979-02-26 1982-06-22 E. I. Du Pont De Nemours & Company Non-electric delay detonator
US4445435A (en) * 1980-05-05 1984-05-01 Atlas Powder Company Electronic delay blasting circuit
US5005694A (en) * 1987-10-19 1991-04-09 Goex, Inc. System for packaging detonating cord for transport
US5636692A (en) * 1995-12-11 1997-06-10 Weatherford Enterra U.S., Inc. Casing window formation
US5709265A (en) * 1995-12-11 1998-01-20 Weatherford/Lamb, Inc. Wellbore window formation
US5791417A (en) * 1995-09-22 1998-08-11 Weatherford/Lamb, Inc. Tubular window formation
US20080083342A1 (en) * 2006-11-07 2008-04-10 Munoz Saldarriaga Daniel R Protector for detonator, and method of use
CN103822552A (en) * 2014-03-20 2014-05-28 武汉科技大学 Wired detonation line sealing device of container for simulating deepwater environment explosion test
CN103837046A (en) * 2014-03-20 2014-06-04 武汉科技大学 Detonating network of container used for simulating explosion test in deepwater environment
EP3163249A1 (en) * 2015-10-29 2017-05-03 Nexter Munitions Igniter for propellant
US20200025544A1 (en) * 2017-04-13 2020-01-23 Fr. Sobbe Gmbh Ignition Device with a Compact Design

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3505937A1 (en) * 1985-02-21 1986-08-21 Friedrich-Wilhelm Dipl.-Kaufm. 4600 Dortmund Sobbe Electrically operable pressure trigger

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188914A (en) * 1963-08-30 1965-06-15 Du Pont Explosive release ignition assembly
US3739724A (en) * 1971-08-23 1973-06-19 Explosives Corp America Safety detonating apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188914A (en) * 1963-08-30 1965-06-15 Du Pont Explosive release ignition assembly
US3739724A (en) * 1971-08-23 1973-06-19 Explosives Corp America Safety detonating apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132171A (en) * 1974-11-04 1979-01-02 Pawlak Daniel E Apparatus for detonating an explosive charge
US4335652A (en) * 1979-02-26 1982-06-22 E. I. Du Pont De Nemours & Company Non-electric delay detonator
US4292895A (en) * 1979-10-09 1981-10-06 Schlumberger Technology Corporation Explosive safe-arming apparatus for perforating guns
US4311096A (en) * 1980-05-05 1982-01-19 Atlas Powder Company Electronic blasting cap
US4445435A (en) * 1980-05-05 1984-05-01 Atlas Powder Company Electronic delay blasting circuit
US5005694A (en) * 1987-10-19 1991-04-09 Goex, Inc. System for packaging detonating cord for transport
US5791417A (en) * 1995-09-22 1998-08-11 Weatherford/Lamb, Inc. Tubular window formation
US5709265A (en) * 1995-12-11 1998-01-20 Weatherford/Lamb, Inc. Wellbore window formation
US5636692A (en) * 1995-12-11 1997-06-10 Weatherford Enterra U.S., Inc. Casing window formation
US6024169A (en) * 1995-12-11 2000-02-15 Weatherford/Lamb, Inc. Method for window formation in wellbore tubulars
US20080083342A1 (en) * 2006-11-07 2008-04-10 Munoz Saldarriaga Daniel R Protector for detonator, and method of use
US8006622B2 (en) 2006-11-07 2011-08-30 Orica Explosives Technology Pty Ltd Protector for detonator, and method of use
CN103822552A (en) * 2014-03-20 2014-05-28 武汉科技大学 Wired detonation line sealing device of container for simulating deepwater environment explosion test
CN103837046A (en) * 2014-03-20 2014-06-04 武汉科技大学 Detonating network of container used for simulating explosion test in deepwater environment
EP3163249A1 (en) * 2015-10-29 2017-05-03 Nexter Munitions Igniter for propellant
FR3043191A1 (en) * 2015-10-29 2017-05-05 Nexter Munitions IGNITER FOR THRUSTER
US10180311B2 (en) 2015-10-29 2019-01-15 Nexter Munitions Igniter for propulsion unit
US20200025544A1 (en) * 2017-04-13 2020-01-23 Fr. Sobbe Gmbh Ignition Device with a Compact Design
US11098995B2 (en) * 2017-04-13 2021-08-24 Fr. Sobbe Gmbh Ignition device with a compact design

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Publication number Publication date
DE2458696A1 (en) 1975-08-21
DE2458696B2 (en) 1978-09-21
NO744538L (en) 1975-07-21
FR2256392B3 (en) 1977-09-23
CA1017625A (en) 1977-09-20
DE2458696C3 (en) 1979-05-17
FR2256392A1 (en) 1975-07-25

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