US3463085A - Underwater explosive charge - Google Patents

Underwater explosive charge Download PDF

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Publication number
US3463085A
US3463085A US769469A US3463085DA US3463085A US 3463085 A US3463085 A US 3463085A US 769469 A US769469 A US 769469A US 3463085D A US3463085D A US 3463085DA US 3463085 A US3463085 A US 3463085A
Authority
US
United States
Prior art keywords
explosive charge
casing
aperture
explosive
underwater
Prior art date
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
US769469A
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English (en)
Inventor
William Stewart Kerr Andrew
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US3463085A publication Critical patent/US3463085A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
    • 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
    • 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
    • F42B3/192—Initiators therefor designed for neutralisation on contact with water

Definitions

  • An explosive charge for underwater use comprises a water-destructible explosive contained in a casing having an aperture and normally closed valve means for opening the aperture at a predetermined exterior pressure so that water will enter the casing upon sinking of the latter to a predetermined depth.
  • the valve may take the form of a flexible flap which is displaceable away from the inner end of the aperture by the hydrostatic pressure outside the casing.
  • an explosive charge for underwater use comprises a water-destructible explosive composition contained in a casing having an aperture controlled by valve means which is capable of being opened by hydrostatic pressure to permit water to enter the casing.
  • the valve means conveniently comprises a valve member obturating said aperture and means yieldably urging the valve member into a position closing the aperture.
  • the valve member may be anchored on the casing by means of a resilient member arranged to bias the valve member to the closing position.
  • valve means comprises a valve member and anchoring means formed as an integral moulding from elastomeric material such as, for example, rubber or a thermoplastic material such as, for example, polyethylene or polyvinyl chloride.
  • moulding comprises a flat, flexible valve member formed on the end of a shank adapted to fit into a corresponding anchoring aperture in the casing.
  • the casing may conveniently be any of the waterresistant casings normally used for underwater explosives. Tinplate, terneplate or aluminum canisters are eminently ICE satisfactory.
  • the explosive may also be any of the explosive powder compositions used for underwater operations. Compositions based on sensitised ammonium nitrate are normally used for seismographic prospecting operations.
  • FIG. 1 shows a longitudinal section of the casing of an explosive charge
  • FIG. 2 is a fragmentary section of the casing of FIG. 1 on a larger scale
  • FIGS. 3 and 4 show end views of the portion of easing shown in FIG. 2 from the interior and exterior respectively.
  • the explosive charge comprises explosive composition (not shown) contained within a casing 1 having a body portion 2 and ends 3 and 4.
  • the end 3 is provided with a pocket 5 adapted to accommodate detonation initiating means (booster, detonator and the like as required) and the end 4 is provided with four apertures 6 closed by a rubber valve member 7.
  • the valve member 7 is an integral moulding providing a cylindrical shank portion 8, plugged into an aperture 9 in the end 4, and a thin flexible annular portion 10 extending over the apertures 6.
  • the depth of immersion at which the explosive charge will be desensitised may be predetermined by variation of the nature, flexibility and dimensions of the portion 10 of the valve member 7.
  • the rate at which the water penetrates the charge may also be controlled by the above factors and also by variation of the size and number of the apertures 6.
  • An explosive charge for underwater use comprising a casing having at least one aperture therethrough, a water-destructible explosive composition in said casing and exposed to said aperture, and means associated with said aperture for permitting water to enter said aperture from the outside upon sinking of said casing to a predetermined depth independent of the length of time of immersion to thereby contact and desensitise said eX- plosive inside said casing, said means including valve means carried by said casing and exposed to ambient pressure, said valve means normally closing said aperture against ingress of water and being responsive to a predetermined pressure outside said casing corresponding to said predetermined depth to open said aperture to the water.
  • valve means comprises a valve member obturating the aperture and means yieldably urging the valve member into a position closing the aperture.
  • valve member is anchored on the casing by means of a resilient member arranged to bias the valve member to the closing position.
  • valve means comprises a valve member and anchoring means formed as an integral moulding from elastomeric material.
  • An explosive charge as claimed in claim 4 wherein the elastomeric material is selected from the group consisting of rubber, polyethylene and polyvinyl chloride.
  • An explosive charge as claimed in claim 4 wherein the moulding comprises a flat, flexible valve memb r formed on the end of a shank adapted to fit into an anchoring aperture in the casing.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Oceanography (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Safety Valves (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US769469A 1966-03-18 1968-10-04 Underwater explosive charge Expired - Lifetime US3463085A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11989/66A GB1118774A (en) 1966-03-18 1966-03-18 Underwater explosive charge

Publications (1)

Publication Number Publication Date
US3463085A true US3463085A (en) 1969-08-26

Family

ID=9996384

Family Applications (1)

Application Number Title Priority Date Filing Date
US769469A Expired - Lifetime US3463085A (en) 1966-03-18 1968-10-04 Underwater explosive charge

Country Status (9)

Country Link
US (1) US3463085A (enrdf_load_stackoverflow)
BE (1) BE695345A (enrdf_load_stackoverflow)
DE (1) DE1295435B (enrdf_load_stackoverflow)
ES (1) ES338142A1 (enrdf_load_stackoverflow)
FR (1) FR1515428A (enrdf_load_stackoverflow)
GB (1) GB1118774A (enrdf_load_stackoverflow)
NL (1) NL6702991A (enrdf_load_stackoverflow)
NO (1) NO116792B (enrdf_load_stackoverflow)
SE (1) SE334568B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948177A (en) * 1974-07-12 1976-04-06 Hercules Incorporated Self-disarming explosive cartridges

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US601604A (en) * 1898-03-29 Marine torpedo
US1314413A (en) * 1919-08-26 Joseph martena
US3322066A (en) * 1966-02-08 1967-05-30 Trojan Powder Co Self-destructive explosive cartridge for underwater seismic exploration
US3358600A (en) * 1966-01-13 1967-12-19 Trojan Powder Co Self-destroying explosive cartridge for underwater seismic exploration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US601604A (en) * 1898-03-29 Marine torpedo
US1314413A (en) * 1919-08-26 Joseph martena
US3358600A (en) * 1966-01-13 1967-12-19 Trojan Powder Co Self-destroying explosive cartridge for underwater seismic exploration
US3322066A (en) * 1966-02-08 1967-05-30 Trojan Powder Co Self-destructive explosive cartridge for underwater seismic exploration

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948177A (en) * 1974-07-12 1976-04-06 Hercules Incorporated Self-disarming explosive cartridges

Also Published As

Publication number Publication date
SE334568B (enrdf_load_stackoverflow) 1971-04-26
FR1515428A (fr) 1968-03-01
NL6702991A (enrdf_load_stackoverflow) 1967-09-19
GB1118774A (en) 1968-07-03
ES338142A1 (es) 1968-04-01
DE1295435B (de) 1969-05-14
BE695345A (enrdf_load_stackoverflow) 1967-09-11
NO116792B (enrdf_load_stackoverflow) 1969-05-19

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