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US3691954A - Explosive cartridge - Google Patents

Explosive cartridge Download PDF

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Publication number
US3691954A
US3691954A US59318A US3691954DA US3691954A US 3691954 A US3691954 A US 3691954A US 59318 A US59318 A US 59318A US 3691954D A US3691954D A US 3691954DA US 3691954 A US3691954 A US 3691954A
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US
United States
Prior art keywords
explosive
charge
flexible tube
detonating cord
booster charge
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Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US59318A
Inventor
Forrest L Kern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BARCLAYS/AMERICAN/BUSINESS CREDIT Inc A CORP OF CT
Commercial Solvents Corp
Original Assignee
Commercial Solvents Corp
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Publication date
Application filed by Commercial Solvents Corp filed Critical Commercial Solvents Corp
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Publication of US3691954A publication Critical patent/US3691954A/en
Assigned to TROJAN CORPORATION, A CORP. OF DE. reassignment TROJAN CORPORATION, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL MINERALS & CHEMICALS CORPORATION
Assigned to BARCLAYS/AMERICAN/BUSINESS CREDIT, INC., A CORP. OF CT. reassignment BARCLAYS/AMERICAN/BUSINESS CREDIT, INC., A CORP. OF CT. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TROJAN CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/087—Flexible or deformable blasting cartridges, e.g. bags or hoses for slurries
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D5/00—Safety arrangements

Definitions

  • Patent Kern [54] EXPLOSIVE CARTRIDGE [72] inventor: Forrest L. Kern, Allentown, Pa.
  • An explosive cartridge comprising a container having therein a slurry of high explosive charge, a cast booster charge and a loop of detonating cord associated with the cast booster charge and extending outside the container, the cartridge being provided with means to maintain the cast booster charge in contact with the slurry explosive charge upon application of tension on the loop of detonating cord.
  • EXPLOSIVE CARTRIDGE This invention relates to an explosive cartridge useful in mining, quarrying and oil recovery operations wherein explosives are lowered into drill holes. Such operations are described in US. Pat. No. 3,256,814, issued June 21, 1966 to Kruppenbach et al. as are explosive cartridges used therein.
  • a plurality of explosive cartridges are loaded into a drill hole tied to a common fuse that extends the length of the drill hole.
  • tension is applied to the connection between the detonating fuse and the explosive cartridge such that occasionally the explosive cartridge misflres.
  • the explosive cartridge of this invention is designed to obviate misfirings in the drill hole.
  • the explosive cartridge of this invention comprises a container having therein a slurry high explosive charge, a cast booster charge and detonating cord.
  • the slurry explosive charge is confined in the closed lower end of an outer flexible tube.
  • a cast booster charge adapted to receive a loop of detonating cord, and having a closed loop of detonating cord passing through the booster charge and extending upwardly therefrom, is confined in an inner flexible tube.
  • the inner flexible tube containing the cast booster charge and the loop of detonating cord is positioned within the outer flexible tube at least partially submerged in the slurry high explosive charge.
  • a tie closure to close the upper end of the outer flexible tube and form the container is positioned near the upper end of the outer flexible tube and above the booster charge and is drawn tightly around the outer flexible tube, the inner flexible tube and the detonating cord extending upwardly from the booster charge such that the upper end of the loop of detonating cord extends through the tie closure and outside the container.
  • a rigid spacing means surrounding the detonating cord is positioned within the outer flexible tube below the tie closure and above the booster charge, the rigid spacing means being dimensioned to maintain the cast booster charge at least partially submerged in the slurry explosive charge during periods of tension applied to the ring-shaped fuse holder.
  • a ring-shaped fuse holder surrounds the upper end of the loop of detonating cord and is dimensioned to receive the detonating fuse.
  • FIG. I is a longitudinal section of an explosive cartridge of the invention showing the spacing means positioned between the inner and outer flexible tubes;
  • FIG. 2 is a longitudinal section of an explosive cartridge of the invention showing the spacing means positioned within the inner flexible tube;
  • FIG. 3 is a longitudinal cross-section of a distended drill or bore hole showing a train of the explosive cartridges of the invention tied to a detonating fuse downline.
  • the explosive cartridge comprises a cardboard protective sheath 1, an outer flexible tube 4 containing a slurry explosive charge 5, and an inner flexible tube 6 containing a cast booster charge 7.
  • Cast booster charge 7 is of the type described in US Pat. No. 3,359,902 issued Dec. 26, 1967 to Minnick et a1. having passages therethrough adapted to receive a loop of detonating cord. Twin loops of detonating cord 3 pass through cast booster charge 7 and extend upwardly therefrom. Wire tie closure 10 is drawn tightly around outer flexible tube 4, inner flexible tube 6 and detonating cord 3. Surrounding the upper end of the loops of detonating cord 3 are slip-rings l4.
  • Spacing means 8 Positioned between outer flexible tube 4 and inner flexible tube 6 and surrounding detonating cord 3 is rigid spacing means 8 in the form of a section of rigid plastic pipe. Spacing means 8 separates outer flexible tube 4 and inner flexible tube 6 and, bearing against the respective tube surfaces, maintains cast booster charge 7 at least partially submerged in slurry explosive charge 5, i.e., below level 5 of slurry explosive charge 5.
  • FIG. 2 differs from FIG. 1 in that rigid spacing means 8 is positioned within inner flexible tube 6.
  • spacing means 8 bears against the inner surface flexible tube 6 at one end and against cast booster charge 7 at the other end to maintain cast booster charge 7 at least partially submerged in slurry explosive 5.
  • FIG. 3 shows the effect of tension on the explosive cartridge when tied to and strung on a detonating fuse downline in a drill hole.
  • Tension on slip-rings 14 tends to pull cast booster charge 7 out of contact with slurry explosive charge 5.
  • Spacing means 8 maintains cast booster charge 7 at all times at least partially submerged in slurry explosive charge 5.
  • Slurry high explosive charge 5 can be of the relatively insensitive type conventionally employed, preferably a high explosive with a density greater than that of water and a detonating velocity of about 18,000 feet per second.
  • any high explosive can be used, such as TNT sensitized ammonium nitrate type slurry high explosives, smokeless powder sensitized ammonium nitrate type slurry high explosives; nitrostarch sensitized ammonium nitrate type slurry high explosives; and nitrostarch sensitized ammonium nitrate type semisolid high explosives, nitrocarbonitrates, nitroglycerine dynamites, such as semigelatins, ammonia gelatins and ammonia dynamites.
  • the density is not critical, but should exceed that of water by a sufficient amount to ensure that the primer will not float, and will preferably be at least 1.4.
  • the detonating velocity will be sufficiently high to detonate the nitrocarbonitrate cartridges. This is known, and in the case of nitrocarbonitrate cartridges is usually at least 18,000 ft./sec.
  • Cast booster charge 7 can be of the type conventionally employed such as described in US. Pat No. 3,359,902. These are normally composed of cast Primacord-insensitive explosive material of high brisance, e.g., cast or pressed TNT, composition B (59% RDX, 40% TNT and 1% wax) or a mixture thereof, having imbedded therein, for example, tubular material fabricated from any of the Primacord-sensitive explosive materials presently available including pentaerythritol tetranitrate (PETN cyclotrimethylenetrinitramine (RDX tetranitromethylaniline (tetryl pentolite ⁇ 5 0% PETN-50% TNT), etc.
  • the cast booster may, however, be composed entirely of irimacord-sensitive explosive material such as, for example, pentolite.
  • Detonating cord 3 advantageously is Primacord.
  • Flexible tubes 4 and 6 can be fabricated from a flexible plastic such as polyethylene or polypropylene, and rigid spacing means 8 can be fabricated from a plastic such as polypropylene or polystyrene so long as wall thickness is sufficient to impart rigidity.
  • An explosive package comprising a container having therein a slurry high explosive charge, a cast booster charge and detonating cord;
  • a cast booster charge being adapted to receive a loop of detonating cord, a closed loop of detonating cord passing through the booster charge and extending upwardly therefrom,
  • the inner flexible tube containing the cast booster charge and the loop of detonating cord being positioned within the outer flexible tube at least partially submerged within the slurry high explosive charge
  • tie closure to close the upper end of the outer flexible tube and form the container, the tie closure being near the upper end of the outer flexible tube and above the booster charge and being drawn tightly around the outer flexible tube, the inner flexible tube and the detonating cord extending upwardly from the booster charge such that the upper end of the loop of detonating cord extends through the tie closure and outside the container,
  • the rigid spacing means being dimensioned to maintain the cast booster charge at least partially submerged in the slurry explosive charge during periods of tension applied to the ring-shaped fuse holder.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

An explosive cartridge comprising a container having therein a slurry of high explosive charge, a cast booster charge and a loop of detonating cord associated with the cast booster charge and extending outside the container, the cartridge being provided with means to maintain the cast booster charge in contact with the slurry explosive charge upon application of tension on the loop of detonating cord.

Description

United States" Patent Kern [54] EXPLOSIVE CARTRIDGE [72] inventor: Forrest L. Kern, Allentown, Pa.
[73] Assignee: Commercial Solvents Corporation [22] Filed: July 29, 1970 [2i] Appl. No.: 59,318
[52] US. Cl. ..l02/24 [51] Int. Cl. ..F42b 3/00 [58] H Field of Search l02/22-24, 27
[56] References Cited UNITED STATES PATENTS 3,256,814 6/1966 Kruppenbach et al......l02/24 [4 1 Sept. 19, 1972 Primary Examiner-Verlin R. Pendegrass Attorney-John W. Behringer, Eugene L. Bernard, Martin J. Brown, James N. Dresser, W. Brown Morton, Jr., John T. Roberts, Malcolm L. Sutherland and Morton, Bernard, Brown, Roberts 8L Sutherland [5 7 1 ABSTRACT An explosive cartridge comprising a container having therein a slurry of high explosive charge, a cast booster charge and a loop of detonating cord associated with the cast booster charge and extending outside the container, the cartridge being provided with means to maintain the cast booster charge in contact with the slurry explosive charge upon application of tension on the loop of detonating cord.
1 Claim, 3 Drawing Figures PATENTED SEP 1 9 I972 I\'\'E\'TOR.
FORREST L. KERN BYW 5, 7 M
EXPLOSIVE CARTRIDGE This invention relates to an explosive cartridge useful in mining, quarrying and oil recovery operations wherein explosives are lowered into drill holes. Such operations are described in US. Pat. No. 3,256,814, issued June 21, 1966 to Kruppenbach et al. as are explosive cartridges used therein.
As described in that patent, in common practice a plurality of explosive cartridges are loaded into a drill hole tied to a common fuse that extends the length of the drill hole. During the loading operation and in distended holes, tension is applied to the connection between the detonating fuse and the explosive cartridge such that occasionally the explosive cartridge misflres. The explosive cartridge of this invention is designed to obviate misfirings in the drill hole.
STATEMENT OF INVENTION The explosive cartridge of this invention comprises a container having therein a slurry high explosive charge, a cast booster charge and detonating cord.
The slurry explosive charge is confined in the closed lower end of an outer flexible tube. A cast booster charge adapted to receive a loop of detonating cord, and having a closed loop of detonating cord passing through the booster charge and extending upwardly therefrom, is confined in an inner flexible tube.
The inner flexible tube containing the cast booster charge and the loop of detonating cord is positioned within the outer flexible tube at least partially submerged in the slurry high explosive charge.
A tie closure to close the upper end of the outer flexible tube and form the container is positioned near the upper end of the outer flexible tube and above the booster charge and is drawn tightly around the outer flexible tube, the inner flexible tube and the detonating cord extending upwardly from the booster charge such that the upper end of the loop of detonating cord extends through the tie closure and outside the container.
A rigid spacing means surrounding the detonating cord is positioned within the outer flexible tube below the tie closure and above the booster charge, the rigid spacing means being dimensioned to maintain the cast booster charge at least partially submerged in the slurry explosive charge during periods of tension applied to the ring-shaped fuse holder.
A ring-shaped fuse holder surrounds the upper end of the loop of detonating cord and is dimensioned to receive the detonating fuse.
A preferred embodiment of the explosive cartridge of this invention is shown in the accompanying drawings wherein:
FIG. I is a longitudinal section of an explosive cartridge of the invention showing the spacing means positioned between the inner and outer flexible tubes;
FIG. 2 is a longitudinal section of an explosive cartridge of the invention showing the spacing means positioned within the inner flexible tube; and
FIG. 3 is a longitudinal cross-section of a distended drill or bore hole showing a train of the explosive cartridges of the invention tied to a detonating fuse downline.
Referring to FIG. 1, the explosive cartridge comprises a cardboard protective sheath 1, an outer flexible tube 4 containing a slurry explosive charge 5, and an inner flexible tube 6 containing a cast booster charge 7.
Cast booster charge 7 is of the type described in US Pat. No. 3,359,902 issued Dec. 26, 1967 to Minnick et a1. having passages therethrough adapted to receive a loop of detonating cord. Twin loops of detonating cord 3 pass through cast booster charge 7 and extend upwardly therefrom. Wire tie closure 10 is drawn tightly around outer flexible tube 4, inner flexible tube 6 and detonating cord 3. Surrounding the upper end of the loops of detonating cord 3 are slip-rings l4.
Positioned between outer flexible tube 4 and inner flexible tube 6 and surrounding detonating cord 3 is rigid spacing means 8 in the form of a section of rigid plastic pipe. Spacing means 8 separates outer flexible tube 4 and inner flexible tube 6 and, bearing against the respective tube surfaces, maintains cast booster charge 7 at least partially submerged in slurry explosive charge 5, i.e., below level 5 of slurry explosive charge 5.
FIG. 2 differs from FIG. 1 in that rigid spacing means 8 is positioned within inner flexible tube 6. In this embodiment, spacing means 8 bears against the inner surface flexible tube 6 at one end and against cast booster charge 7 at the other end to maintain cast booster charge 7 at least partially submerged in slurry explosive 5.
FIG. 3 shows the effect of tension on the explosive cartridge when tied to and strung on a detonating fuse downline in a drill hole. Tension on slip-rings 14 tends to pull cast booster charge 7 out of contact with slurry explosive charge 5. Spacing means 8 maintains cast booster charge 7 at all times at least partially submerged in slurry explosive charge 5.
Slurry high explosive charge 5 can be of the relatively insensitive type conventionally employed, preferably a high explosive with a density greater than that of water and a detonating velocity of about 18,000 feet per second. As described in U. S. Pat. No. 3,256,814, any high explosive can be used, such as TNT sensitized ammonium nitrate type slurry high explosives, smokeless powder sensitized ammonium nitrate type slurry high explosives; nitrostarch sensitized ammonium nitrate type slurry high explosives; and nitrostarch sensitized ammonium nitrate type semisolid high explosives, nitrocarbonitrates, nitroglycerine dynamites, such as semigelatins, ammonia gelatins and ammonia dynamites. The density is not critical, but should exceed that of water by a sufficient amount to ensure that the primer will not float, and will preferably be at least 1.4. The detonating velocity will be sufficiently high to detonate the nitrocarbonitrate cartridges. This is known, and in the case of nitrocarbonitrate cartridges is usually at least 18,000 ft./sec.
Cast booster charge 7 can be of the type conventionally employed such as described in US. Pat No. 3,359,902. These are normally composed of cast Primacord-insensitive explosive material of high brisance, e.g., cast or pressed TNT, composition B (59% RDX, 40% TNT and 1% wax) or a mixture thereof, having imbedded therein, for example, tubular material fabricated from any of the Primacord-sensitive explosive materials presently available including pentaerythritol tetranitrate (PETN cyclotrimethylenetrinitramine (RDX tetranitromethylaniline (tetryl pentolite {5 0% PETN-50% TNT), etc. The cast booster may, however, be composed entirely of irimacord-sensitive explosive material such as, for example, pentolite.
Detonating cord 3 advantageously is Primacord.
Flexible tubes 4 and 6 can be fabricated from a flexible plastic such as polyethylene or polypropylene, and rigid spacing means 8 can be fabricated from a plastic such as polypropylene or polystyrene so long as wall thickness is sufficient to impart rigidity.
I claim:
1. An explosive package comprising a container having therein a slurry high explosive charge, a cast booster charge and detonating cord;
the slurry explosive charge being confined in the closed lower end of an outer flexible tube,
a cast booster charge being adapted to receive a loop of detonating cord, a closed loop of detonating cord passing through the booster charge and extending upwardly therefrom,
the cast booster charge and the loop of detonating charge extending therefrom being confined in an inner flexible tube,
the inner flexible tube containing the cast booster charge and the loop of detonating cord being positioned within the outer flexible tube at least partially submerged within the slurry high explosive charge,
a tie closure to close the upper end of the outer flexible tube and form the container, the tie closure being near the upper end of the outer flexible tube and above the booster charge and being drawn tightly around the outer flexible tube, the inner flexible tube and the detonating cord extending upwardly from the booster charge such that the upper end of the loop of detonating cord extends through the tie closure and outside the container,
rigid spacing means surrounding the detonating cord and positioned within the outer flexible tube below the tie closure and above the booster charge,
and a ring-shaped fuse holder surrounding the upper end of the loop of detonating cord and dimensioned to receive a detonating fuse,
the rigid spacing means being dimensioned to maintain the cast booster charge at least partially submerged in the slurry explosive charge during periods of tension applied to the ring-shaped fuse holder.
US59318A 1970-07-29 1970-07-29 Explosive cartridge Expired - Lifetime US3691954A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880080A (en) * 1973-04-06 1975-04-29 Ireco Chemicals Booster for explosive blasting agents
US3949673A (en) * 1974-04-16 1976-04-13 E. I. Dupont De Nemours And Company Semi-rigid sinuous blasting charge and borehole loading method
US4790890A (en) * 1987-12-03 1988-12-13 Ireco Incorporated Packaged emulsion explosives and methods of manufacture thereof
US5259316A (en) * 1992-11-09 1993-11-09 Nelson James E Method and apparatus for wet/dry, small bore hole explosive device
USH1457H (en) * 1992-09-29 1995-07-04 The United States Of America As Represented By The Secretary Of The Army Fuel air explosive canister
US20130199393A1 (en) * 2010-04-06 2013-08-08 Sandvik Mining And Construction Rsa (Pty) Ltd Rock Breaking Product
US10927627B2 (en) 2019-05-14 2021-02-23 DynaEnergetics Europe GmbH Single use setting tool for actuating a tool in a wellbore
US11204224B2 (en) 2019-05-29 2021-12-21 DynaEnergetics Europe GmbH Reverse burn power charge for a wellbore tool
US11255147B2 (en) 2019-05-14 2022-02-22 DynaEnergetics Europe GmbH Single use setting tool for actuating a tool in a wellbore
US11578549B2 (en) 2019-05-14 2023-02-14 DynaEnergetics Europe GmbH Single use setting tool for actuating a tool in a wellbore
US11753889B1 (en) 2022-07-13 2023-09-12 DynaEnergetics Europe GmbH Gas driven wireline release tool
US11761281B2 (en) 2019-10-01 2023-09-19 DynaEnergetics Europe GmbH Shaped power charge with integrated initiator
US12000267B2 (en) 2021-09-24 2024-06-04 DynaEnergetics Europe GmbH Communication and location system for an autonomous frack system
US12139984B2 (en) 2023-04-13 2024-11-12 Dbk Industries, Llc Fixed-volume setting tool

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256814A (en) * 1964-02-10 1966-06-21 Trojan Powder Co Explosive primer package with slip fit fuse holder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256814A (en) * 1964-02-10 1966-06-21 Trojan Powder Co Explosive primer package with slip fit fuse holder

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880080A (en) * 1973-04-06 1975-04-29 Ireco Chemicals Booster for explosive blasting agents
US3949673A (en) * 1974-04-16 1976-04-13 E. I. Dupont De Nemours And Company Semi-rigid sinuous blasting charge and borehole loading method
US4790890A (en) * 1987-12-03 1988-12-13 Ireco Incorporated Packaged emulsion explosives and methods of manufacture thereof
USH1457H (en) * 1992-09-29 1995-07-04 The United States Of America As Represented By The Secretary Of The Army Fuel air explosive canister
US5259316A (en) * 1992-11-09 1993-11-09 Nelson James E Method and apparatus for wet/dry, small bore hole explosive device
US20130199393A1 (en) * 2010-04-06 2013-08-08 Sandvik Mining And Construction Rsa (Pty) Ltd Rock Breaking Product
US9062953B2 (en) * 2010-04-06 2015-06-23 Sandvik Mining And Construction Rsa (Pty) Ltd Rock breaking product
US11578549B2 (en) 2019-05-14 2023-02-14 DynaEnergetics Europe GmbH Single use setting tool for actuating a tool in a wellbore
US10927627B2 (en) 2019-05-14 2021-02-23 DynaEnergetics Europe GmbH Single use setting tool for actuating a tool in a wellbore
US11255147B2 (en) 2019-05-14 2022-02-22 DynaEnergetics Europe GmbH Single use setting tool for actuating a tool in a wellbore
US11204224B2 (en) 2019-05-29 2021-12-21 DynaEnergetics Europe GmbH Reverse burn power charge for a wellbore tool
US11761281B2 (en) 2019-10-01 2023-09-19 DynaEnergetics Europe GmbH Shaped power charge with integrated initiator
US12000267B2 (en) 2021-09-24 2024-06-04 DynaEnergetics Europe GmbH Communication and location system for an autonomous frack system
US11753889B1 (en) 2022-07-13 2023-09-12 DynaEnergetics Europe GmbH Gas driven wireline release tool
US12065896B2 (en) 2022-07-13 2024-08-20 DynaEnergetics Europe GmbH Gas driven wireline release tool
US12139984B2 (en) 2023-04-13 2024-11-12 Dbk Industries, Llc Fixed-volume setting tool

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AS Assignment

Owner name: TROJAN CORPORATION, P.O. BOX 310 SPANISH FORK, UT.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL MINERALS & CHEMICALS CORPORATION;REEL/FRAME:003962/0694

Effective date: 19820122

AS Assignment

Owner name: BARCLAYS/AMERICAN/BUSINESS CREDIT, INC., 111 FOUND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TROJAN CORPORATION;REEL/FRAME:003984/0057

Effective date: 19820122