US3020844A - Explosive device - Google Patents

Explosive device Download PDF

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Publication number
US3020844A
US3020844A US783454A US78345458A US3020844A US 3020844 A US3020844 A US 3020844A US 783454 A US783454 A US 783454A US 78345458 A US78345458 A US 78345458A US 3020844 A US3020844 A US 3020844A
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US
United States
Prior art keywords
shell
detonating fuse
sleeve
low
explosive
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
US783454A
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English (en)
Inventor
Ross J Miller
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US783454A priority Critical patent/US3020844A/en
Priority to GB43604/59A priority patent/GB865756A/en
Priority to DEP24144A priority patent/DE1109069B/de
Priority to FR814406A priority patent/FR1248176A/fr
Application granted granted Critical
Publication of US3020844A publication Critical patent/US3020844A/en
Priority to MY196460A priority patent/MY6400060A/xx
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
    • 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

  • the present invention relates to a novel blasting initiation assembly. More particularly, the present invention relates to a novel connecting assembly whereby a detonation impulse is transmitted from low-energy connecting cord to detonating fuse.
  • the detonation impulse is transmitted to the main explosive charges by means of detonating fuse which contains from 40 to 120 grains of high explosive per linear foot.
  • detonating fuse which contains from 40 to 120 grains of high explosive per linear foot.
  • This transmission is accomplished by a trunk line of fuse to which are attached branch lines of the same fuse leading down into the individual boreholes. Due to the high brisance produced by the exploding core of the described detonating fuse, these attachments may be made satisfactorily by knot-ting the branch detonating fuse to the trunk line.
  • the noise and destructive violence produced by the explosion of such detonating fuse on the surface of the earth has resulted in much dissatisfaction with its use as a trunk line.
  • This connecting cord described in detail in copending application Serial No. 744,586 filed June 25, 1958, now Patent Number 2,982,210 by D. J. Andrew, R. W. Felch, and G. A. Noddin, comprises a continuous core of 0.1 to 2 grains of a cap-sensitive high explosive per foot of length confined within a metal sheath, which preferably is countered with a strengthening and protective coating.
  • the described cord is capable of propagating detonation at the velocity of conventional detonating fuse but without the accompanying destructive shattering or annoying noise.
  • an object of the present invention is to provide an easily practiced means of initiation for cordlike explosive devices, such as detonating fuse and the like.
  • Another object of the present invention is to provide an assembly for connecting low-energy connecting cord and detonating fuse in such a manner that the detonation impulse is transmitted reliably to the detonating fuse from the low-energy connecting cord.
  • a further object of the invention is the provision of an efficient blasting method wherein no objectionable noise or above-ground shattering is encountered.
  • a blasting initiation assembly which comprises a tubular metal shell integrally closed at one end and containing a cap-sensitive detonating explosive therein and concentrically disposed around at least a portion'o-f said shell and contiguously joined therewith a cylindrical sleeve, the end portion of said sleeve opposite said shell having an inside diameter essentially 7 equal to the inside diameter of said shell, and having in tion of detonating fuse of sufiicient length through the apertures provided.
  • crimping of the sleeve may be omitted as the sleeve has been provided with an extension the I inside diameter of which is essentially equal to the outside diameter of low-energy connecting cord and which can retain the cord firmly, particularly if alternate means for retaining the cord are provided in the surface of this portion of the sleeve.
  • the cord should be crimped in the shell to insure initiation of the explosive charge in the shell and to provide a water-tight junction.
  • FIGURE 1 is a top view of one embodiment of the assembly of the present invention
  • FIGURE 2 is a schematic View, partially in cross-section, of the assembly with a length of detonating fuse and two lengths of low-energy connecting cord inserted,
  • FIGURE 3 is a top view, partially in cross section, of the assembly provided with an aperture which is pear shaped and a shell having a delay element interposed adjacent the explosive charge.
  • 1 is a metal shell having one integrally closed end and containing explosive charges 9 and 10.
  • 2 represents a cylindrical metal sleeve having one end concentrically disposed around the closed end portion of shell 1 and having a pair of apertures 3 which form an opening of at least the diameter of detonating fuse and are located in sleeve 2 so as to be contiguous to the closed end of shell 1.
  • 4 represents the other end portion of sleeve 2 and has an inside diameter essentially equal to the inside diameter of shell 1.
  • FIGURE 2 l, 2, 3, and 4 are the same as in FIGURE 1.
  • 5 and 7 represent terminated lengths of low-energy connecting cord inserted into the assembly, the terminal end of cord 7 being retained in the assembly adjacent to the primer charge of a heat-sensitive priming explosive 9 by a circumferential crimp 8.
  • 6 is a length of conventional detonating fuse inserted through the apertures 3.
  • the primer charge 9 is initiable by cord 7 and is above the base charge of a detonating explosive 10 which is disposed at the closed end of shell 1 and which initiates detonating fuse 6.
  • 16 represents the explosive core of the low-energy connecting cord 5.
  • 17 is a metal sheath surrounding the core 25, and 18 is a nonmetallic countering around sheath 17.
  • aperture 3 is preferably somewhat wider than the diameter of ordinary detonating fuse in order that a visual inspection may insure that the terminal portion of cord 5 is closely adjacent to detonating fuse 6, detonating fuse 6 then being firmly maintained between the closed end of shell 1 and the end portion of cord 5 by being squeezed between these two.
  • FIGURE 3 1, 2, 3, 4, 9, and 10 are as in FIGURES 1 or 2.
  • 11 are inwardly directed prongs provided as an aid in retaining the low-energy connecting cord in the portion of smaller diameter 4 of sleeve 2.
  • 12 represents a circumferential crimp which joins shell 1 and sleeve 2 integrally.
  • 13 represents a delay element comprising an exothermic-burning mixture of boron and red lead in terposed adjacent the primer charge 9.
  • 14 represents an open-ended metal capsule having a central aperture 15 interposed adjacent the delay element 13 and which provides static resistance.
  • the low-energy connecting-cord trunk line is severed and one cut end inserted into the open end of the shell, and the shell is crimped. Then detonating fuse of a suitable length is threaded through the apertures provided therefor, one end of the detonating fuse extending to the bottom of the borehole. Next, the other cut end of the low-energy connecting-cord trunk line is inserted into the end portion of the sleeve, firmly abutted against the detonating fuse, and crimped.
  • inwardly directed prongs may be provided in the Wall of the portion of the sleeve having a smaller diameter in order to retain the low-energy connecting cord during the crimping operation.
  • the end of the detonating fuse not extending to the bottom of the borehole is buried in the stemming or is taped or tied to the longer extension to insure against the withdrawal of the fuse from the assembly.
  • the as-, sembly thus formed may be buried to eliminate the escape: of noise from the detonating fuse.
  • Low-energy connecting cord has a larger outside diameter than that of detonating fuse in order to insure against the use of the cord in an assembly or fitting designed for use only with the fuse or vice versa.
  • the apertures In order to provide the maximum side wall and corresponding strength at the portion of the sleeve containing the apertures, the apertures must be in that portion having the larger diameter.
  • the exemplified shell containing an explosive charge is necessary, due to the low brisance produced by exploding low-energy connecting cord, in order to initiate the detonating fuse.
  • a base charge of a cap-sensitive detonating highexplosive of the type conventionally used as the base charge of initiators, i.e., PETN, RDX, lead azide, picryl sulfone, etc. and adjacent the base charge a primer charge of a high explosive which is readily initiated by the low-energy connecting cord.
  • priming compositions are lead azide, diazodinitrophenol, and mercury fulminate.
  • a delay charge may be included adjacent to the primer charge as is shown in FIGURE 3.
  • a delay device is described in copending application Serial No. 749,848 filed on July 21, 1958, by R. J. Miller and G. A. Noddin and assigned to the present assignee and contains as the delay element a layer of a mixture 'of boron and red lead.
  • the low-energy connecting cord and the detonating fuse will have explosive cores comprising a cap sensitive high explosive, for example, PETN, RDX, lead azide, or picryl sulfone.
  • the sleeve cover more than a portion of the shell. However, it may be extended as far as that portion of the shell which is to be crimped. Furthermore, the means by which the two elements are permanently engaged is not critical. An adhesive, :1 circumferential crimp, a friction joint, or any other of the commonly used joining means may be employed.
  • two of the above described assemblies may be used in conjuncture, i.e., tied or taped side-by-side, in order to insure detonation of the charge in the borehole.
  • conjuncture i.e., tied or taped side-by-side
  • the sleeve may be provided with a second shell containing an explosive charge at the end of smaller diameter, the:
  • cylindrical sleeve need not be of' metal as described in the exemplified embodiment of the invention. reinforced paper, or any other material having adequate rigidity also would be suitable.
  • a blasting initiation assembly for cordlike explosive devices which comprises a tubular metal shell closed at one end and containing a cap-sensitive detonating explosive charge and a tubular sleeve having a portion of larger diameter than said shell, one end of which portion is disposed around at least the closed end portion of said shell, and the other end portion of said sleeve being of reduced diameter and having an inside diameter essentially equal to the inside diameter of said shell, said sleeve having a pair of apertures disposed directly opposite each other in said portion of larger diameter so that the axis of said apertures is normal to the longitudinal axis of said sleeve, each of said apertures forming an opening of at least the diameter of conventional detonating fuse and being so located that the closed end of said shell is essentially contiguous to said apertures.
  • a blasting initiation assembly for joining lengths of low-energy connecting cord and for transmitting a detonation impulse from said low-energy connecting cord to detonating fuse which comprises a tubular metal shell having a closed end and an open end, the closed end containing a cap-sensitive detonating explosive and the open end adapted for insertion therein of a low-energy connecting cord for transmitting a detonation impulse to said detonating explosive, a tubular sleeve having a portion of larger diameter than said shell, the end of which portion is disposed around at least the closed end portion of said shell, and the other. end portion of said sleevebeing of reduceddiameter and having an inside A moldable or extrudable plastic material,
  • said sleeve having a pair of apertures in said portion of larger diameter located directly opposite each other and having a portion of their periphery adjacent to said closed end of said shell to permit insertion through said openings, in a direction normal to the longitudinal axis of said sleeve, of a length of detonating fuse contacting said closed end of said shell.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuses (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Air Bags (AREA)
US783454A 1958-12-29 1958-12-29 Explosive device Expired - Lifetime US3020844A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US783454A US3020844A (en) 1958-12-29 1958-12-29 Explosive device
GB43604/59A GB865756A (en) 1958-12-29 1959-12-22 Improvements in or relating to initiating devices
DEP24144A DE1109069B (de) 1958-12-29 1959-12-23 Zuendschnurverbinder
FR814406A FR1248176A (fr) 1958-12-29 1959-12-29 Perfectionnements aux dispositifs d'amorçage
MY196460A MY6400060A (en) 1958-12-29 1964-12-31 Improvements in or relating to initiating devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US783454A US3020844A (en) 1958-12-29 1958-12-29 Explosive device

Publications (1)

Publication Number Publication Date
US3020844A true US3020844A (en) 1962-02-13

Family

ID=25129292

Family Applications (1)

Application Number Title Priority Date Filing Date
US783454A Expired - Lifetime US3020844A (en) 1958-12-29 1958-12-29 Explosive device

Country Status (5)

Country Link
US (1) US3020844A (xx)
DE (1) DE1109069B (xx)
FR (1) FR1248176A (xx)
GB (1) GB865756A (xx)
MY (1) MY6400060A (xx)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103884A (en) * 1962-03-16 1963-09-17 Thomas Q Ciccone Cartridge for more nearly uniform projectile velocities
US3129663A (en) * 1961-08-11 1964-04-21 Aircraft Armaments Inc Fittings for low energy detonating cord
US3169480A (en) * 1962-05-01 1965-02-16 Commercial Solvents Corp Safety device for detonator cord
US3205818A (en) * 1963-08-02 1965-09-14 Du Pont Connector for explosive cords
US3238873A (en) * 1964-10-13 1966-03-08 Teledyne Inc Detonating fuse termination
DE1236987B (de) * 1964-02-14 1967-03-16 Nitroglycerin Ab Verzoegerungszuendsystem
US3349706A (en) * 1966-07-15 1967-10-31 Du Pont Tailless connector
US3776135A (en) * 1972-06-29 1973-12-04 Hercules Inc Non-electric blasting cap assembly
EP0015067A1 (en) * 1979-01-24 1980-09-03 E.I. Du Pont De Nemours And Company Field-connected explosive booster, booster-connector assembly and detonating cord assembly comprising such booster-connector assembly
US4350097A (en) * 1980-05-19 1982-09-21 Atlas Powder Company Nonelectric delay detonator with tubular connecting arrangement
US4495867A (en) * 1982-06-18 1985-01-29 E. I. Du Pont De Nemours And Company Assembly for initiating explosives with low-energy detonating cord
US4681036A (en) * 1986-01-07 1987-07-21 Bintech (Pty) Ltd. Delay starters

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ208080A (en) * 1983-05-20 1986-10-08 Ici Australia Ltd Connector between detonating cord and low energy impulse propagating tubing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1887122A (en) * 1931-01-20 1932-11-08 Hercules Powder Co Ltd Connecter for cordeau bickford
US1991856A (en) * 1931-06-26 1935-02-19 Du Pont Fuse connection
US1991857A (en) * 1933-05-02 1935-02-19 Du Pont Detonator
US2424374A (en) * 1942-07-29 1947-07-22 Ici Ltd Explosive booster
US2739535A (en) * 1950-07-14 1956-03-27 Atlas Powder Co Electric explosion initiators

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR9653E (fr) * 1908-01-21 1909-01-05 Jean Harle Mèche ou cordeau à double effet pour explosifs
DE418001C (de) * 1923-07-21 1925-10-14 Bickford Anordnung zum gleichzeitigen Abtun mehrerer detonierender Zuendschnuere
FR652765A (fr) * 1927-09-23 1929-03-13 Davey Bickford Ets Raccord pour cordeaux détonnants ou mèches instantanées
FR1000774A (fr) * 1949-11-18 1952-02-15 Artifices Titan Soc D Perfectionnement aux artifices de mise de feu
DE891221C (de) * 1951-12-14 1953-09-24 Canadian Ind Vorrichtung zur Verbindung und zur Zuendungsuebertragung zwischen Zuendschnueren
DE915197C (de) * 1952-03-19 1954-07-15 Dynamit Nobel Ag Verzoegerungsstueck als Verbindung zwischen Sprengschnueren
DE964936C (de) * 1954-08-05 1957-05-29 Du Pont Verzoegerungselement fuer Sprengschuesse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1887122A (en) * 1931-01-20 1932-11-08 Hercules Powder Co Ltd Connecter for cordeau bickford
US1991856A (en) * 1931-06-26 1935-02-19 Du Pont Fuse connection
US1991857A (en) * 1933-05-02 1935-02-19 Du Pont Detonator
US2424374A (en) * 1942-07-29 1947-07-22 Ici Ltd Explosive booster
US2739535A (en) * 1950-07-14 1956-03-27 Atlas Powder Co Electric explosion initiators

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129663A (en) * 1961-08-11 1964-04-21 Aircraft Armaments Inc Fittings for low energy detonating cord
US3103884A (en) * 1962-03-16 1963-09-17 Thomas Q Ciccone Cartridge for more nearly uniform projectile velocities
US3169480A (en) * 1962-05-01 1965-02-16 Commercial Solvents Corp Safety device for detonator cord
US3205818A (en) * 1963-08-02 1965-09-14 Du Pont Connector for explosive cords
DE1236987B (de) * 1964-02-14 1967-03-16 Nitroglycerin Ab Verzoegerungszuendsystem
US3238873A (en) * 1964-10-13 1966-03-08 Teledyne Inc Detonating fuse termination
US3349706A (en) * 1966-07-15 1967-10-31 Du Pont Tailless connector
US3776135A (en) * 1972-06-29 1973-12-04 Hercules Inc Non-electric blasting cap assembly
EP0015067A1 (en) * 1979-01-24 1980-09-03 E.I. Du Pont De Nemours And Company Field-connected explosive booster, booster-connector assembly and detonating cord assembly comprising such booster-connector assembly
US4350097A (en) * 1980-05-19 1982-09-21 Atlas Powder Company Nonelectric delay detonator with tubular connecting arrangement
US4495867A (en) * 1982-06-18 1985-01-29 E. I. Du Pont De Nemours And Company Assembly for initiating explosives with low-energy detonating cord
US4681036A (en) * 1986-01-07 1987-07-21 Bintech (Pty) Ltd. Delay starters

Also Published As

Publication number Publication date
FR1248176A (fr) 1960-12-09
DE1109069B (de) 1961-06-15
MY6400060A (en) 1964-12-31
GB865756A (en) 1961-04-19

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