US3205818A - Connector for explosive cords - Google Patents

Connector for explosive cords Download PDF

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US3205818A
US3205818A US299603A US29960363A US3205818A US 3205818 A US3205818 A US 3205818A US 299603 A US299603 A US 299603A US 29960363 A US29960363 A US 29960363A US 3205818 A US3205818 A US 3205818A
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bore
cord
capsule
channel
tube
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John R Coulson
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EIDP Inc
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EI Du Pont de Nemours and Co
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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
    • F42D1/043—Connectors for detonating cords and ignition tubes, e.g. Nonel tubes

Definitions

  • This invention relates to a device for effectively and safely securing a length of low energy connecting cord and a detonating fuse in operative relationship to one another so that a detonation stimulus can be propagated from the fuse to the cord or, conversely, from the cord to the fuse.
  • low-energy connecting cord comprises a continuous core of a detonating explosive, e.g., PETN, RDX, nitromannite, HMX, lead azide, picryl sulfone, etc., at a loading of from 0.5 to 2 grains per foot of length, contained within a sheath of a ductile metal which is subsequently covered with one or more layers of reinforcing and/ or waterproofing material.
  • a detonating explosive e.g., PETN, RDX, nitromannite, HMX, lead azide, picryl sulfone, etc.
  • this cord Due to its ability to propagate a detonation impulse without attendant brisance and because it is free frornthe hazards associated with electric initiators, in many explosive applications, such as blasting operations, this cord has replaced conventional detonating fuse, i.e., Primacord, and electrical initiators. In many applications, it is desirable to use this cord in conjunction with detonating fuse, the low-energy connecting cord being used in sections of the blasting assembly where brisance would be undesirable and the detonating fuse being used where a detonation stimulus of greater magnitude is needed or, in any case, would not be objectionable.
  • detonating fuse i.e., Primacord
  • a connector for explosive cords which comprises a tube of an electrically nonconductive material having at least one open end, a transverse slot intermediate the ends of the tube and communicating with its bore, the walls of the slot providing means for accepting and engaging a first explosive cord in a recessed position in the tube at substantially right angles to its longitudinal axis, and means in said bore for retaining the end of a second explosive cord in said tube in propa gating relationship to said first cord.
  • a booster charge of high velocity detonating explosive is interposed between, and in propagating relationship to, the end of the second cord in the bore of the tube and the slot for the firstcord, the booster charge being adapted to transmit a detonation stimulus from one of said cords to the other.
  • explosive cord as used herein is meant to include both the newly developed low-energy connecting cord and conventional detonating fuse.
  • transverse slot is intended to require that the slot extend completely across the tube at an angle to its longitudinal axis.
  • the first cord should be recessed sufiiciently to allow propagation between it and the second explosive cord or between it and a booster charge if a booster charge is required.
  • the exposed core of the second cord be essentially in contact with the wall of the first cord.
  • low energy connecting cord having a core of PETN will pick up the detonation from Primacord if it is flush or nearly flush; however, low energy connecting cord having a core of 2 gr./ft. lead azide will pick up a detonation from a cord having a cord of PETN at a loading of a 4 gr./ft. contained in a sheath of rayon braid and a polyethylene jacket across a space of about one inch.
  • FIGURE 1 is a view of one form of a connector in accordance with this invention in longitudinal cross section;
  • FIGURE 2 is a perspective view of the assembly with a length of detonating fuse and a length of connecting cord inserted;
  • FIGURE 3 is a view in partial cross-section of an alternative embodiment of the connector of this invention.
  • FIGURE 4 is a view in partial cross-section of still another embodiment of the connector of this invention.
  • FIGURE 5 is an enlarged perspective view of the retaining clip in the connector of FIGURE 4.
  • FIGURE 1 is a tube of a nonconductive material having an open extremity A and a closed extremity B.
  • Slot 2 is provided near extremity B and is essentially perpendicular to the longitudinal axis of the shell.
  • the slot is provided with resilient projections 3 and terminates in recessed channel 4- which is here shown as circular and which is adapted to receive detonating fuse transversely therethrough.
  • the bore 5 of the tube 1 proceeds from open extremity A and communicates with channel 4 through opening 6.
  • a booster charge 7 of a high velocity detonating explosive is contained in capsule 16 which is crimped to the end of low energy connecting cord 8 within the shell and is contiguous to opening 6 which corrnnunicates with channel 4 provided for the detonating fuse.
  • the low energy connecting cord comprises core 9 of detonating composition, metal sheath l0 and .a countering 11 of a waterproof composition.
  • Shoulder projection 17, which may be one continuous annular projection or a plurality of individual projections, provides means in the bore which permit forceful insertion of capsule 16 from the open end A of tube 1 but resist its withdrawal thereby retaining cord 8 in the bore of tube 1.
  • FIGURE 2 the connector of FIGURE 1 is shown with a length of detonating fuse 15 in channel 4 and held in place by projections 3. Low energy connecting cord is contained in bore 5 of tube 1.
  • slot 2 is best defined as terminating in two aligned apertures 4a, one at each of its ends.
  • the alignment of these apertures is such that they position the explosive cord, e.g., detonating fuse, with respect to booster capsule 7 in the same manner as channel 4 (FIGURE 1).
  • slot 2 is angled to provide greater holding power and one or more ribs 19 are provided to insure a snug fit between the booster capsule and the inner wall of tube 1.
  • a thin rib or rudder 2t reinforces the slotted portion of the tube and strengthens the grip of the tubular connector on the detonating fuse. This strengthening also could be accomplished by increasing the wall thickness or by using a more rigid nonconductive material.
  • the booster charge 7 is a pressed pellet contiguous to opening 6 which communicates between bore and channel 4.
  • Clip 12 is provided to engage the low-energy connecting cord with its cut end in propagating relationship to the booster charge 7.
  • the clip has projections 13 which extend from its interior surface and cut into the countering of the low energy connecting cord and an oppositely disposed serrated edge 14 which grips the inner wall of tube 1.
  • FIGURE 5 is an enlarged perspective view of the clip.
  • booster charge 7 can be contained in a capsule which is crimped to the inserted end of the low-energy connecting cord or may be a pressed pellet of an explosive composition.
  • the cord may be forcefully inserted into the bore of the tube past shoulder projections 17 with the capsule containing the booster charge already crimped on the end of the cord.
  • the cord is inserted into the bore of the tube past shoulder 17, i.e., the tube may be slipped over the cord, the capsule containing the booster charge crimped on the end of the cord and the capsule positioned in the bore of the tube with the shoulder 17 and the rib I9 retaining the cord in the bore of the tube.
  • the detonating fuse is inserted into slot 2 which preferably is flared for easy insertion of the fuse and is pulled down past resilient projections 3 which retain the fuse in aperture 4.
  • either the detonating fuse or the low-energy connecting cord can be the main line, the other cord then being the branch line.
  • the detonation impulse is propagated to booster charge 7 by the explosive core 9 of cord 8.
  • booster charge 7 the detonation impulse produced is suflicient to initiate the detonating fuse.
  • the detonating fuse is the main line, the brisance of this fuse, as a detonation impulse passes through opening 6, initiates the core 9 of cord 8 directly so there is no need for a booster charge.
  • the connector of this invention is particularly useful in nonelectric delay blasting assemblies which provide insurance from cut offs due to ground movement and also permit bottom hole priming while avoiding the hazards of accidental actuation by stray electric currents, e.g., electrostatic discharges, radio frequency energy, and stray currents encountered with electric initiators.
  • shell 1 is of an electrically nonconductive plastic material, there is no danger of accidental, premature initiation of the assembly due to the build-up of charges or instantaneous surges of electricity through the unit. Disintegration of the plastic material of the shell upon detonation of the cords is not hazardous to persons or equipment in the vicinity.
  • the tubular nonconductive shell which is critical to our invention must have sufficient flexibility to enable the cords to be connected with relative ease yet must be rigid enough to withstand pressures and abrasive action present in blasting operations. Accordingly, plastic materials such as high density polyethylene, polypropylene, acetal resins, polytetrafiuoroethylene, nylon, unplasticized polyvinyl chloride, polystyrene, acrylic polymers, and phenolic resins having characteristics of rigidity, tear resistance, and a flexibility are suitable for use as tube 1. These materials are particularly suitable because of their high resistance to sear and deterioration in outside use.
  • the shell of the connectors can be machined or, preferably, formed by injection molding.
  • the booster charge present to insure initiation of the receptor charge is a pressed, high velocity detonating explosive, for example a pellet of pressed waxed RDX or a pellet of pressed pentolite or a similar composition. Placing the booster charge in a tubular capsule, which is attached, e.g., by crimping, to the end of the low energy connecting cord, insures against damage to the ends of the cord and maintains a waterproof seal at the ends.
  • the loading of the booster charge will preferably be about 1.5 to 2.0 grains.
  • a booster charge of 1.8 grains of finely divided PETN in a coined bottom shell is particularly preferred.
  • a connector comprising an electrically-nonconductive tube having a substantially cylindrical bore extending its entire length; a transverse slot for accepting a length of detonating fuse, extending through the side of the tube intermediate its ends in a direction generally normal to the bores longitudinal axis and terminating in two aligned apertures, one at each end of the slot, the alignment being such that a straight line connecting the apertures intersects the longitudinal axis of said bore at substantially right angles, and the Walls of said slot providing resilient projections for positioning and firmly engaging said fuse in said apertures; reinforcing means integral with the exterior surface of said tube opposite said slot and extending in the direction of said longitudinal axis; a single length of low-energy connecting cord extending into said bore through its first end; and a.
  • booster capsule snugly seated in said bore and having an integrally closed extremity contiguous to the side of said apertures nearest the bores said first end, said capsule containing a booster charge at its closed extremity in propagating relationship to the end of said cord in the bore and having its other extremity crimped on said cord; the said first end of the bore being provided with at least one integral projection for abutting the crimped extremity of the capsule and preventing its withdrawal from said first end, said bore being of sufficient diameter from its second end to said projection at its other end to permit insertion of said capsule into the bore through said second end and its passage past the slot until said integrally closed extremity is contiguous to said nearest side of the apertures.
  • a connector comprising an electrically-nonconductive tube closed at one end and having a substantially cylindrical bore extending through its other end and running part of its length; a transverse slot between said closed end and the internal end of said bore for accepting a length of detonating fuse, said slot extending through a side of the tube in a direction generally normal to the bores longitudinal axis and terminating in a channel which communicates with said bore and intersects said axis at substantially right angles, the walls of said slot providing at least one resilient projection intermediate said channel and the outside surface of the tube for positioning and firmly engaging said fuse in said channel at substantially right angles to said axis; a single length of low-energy connecting cord extending into said bore through its open end; and a booster capsule snugly seated in said bore and having an integrally closed extremity adjacent to the side of said channel nearest the bores open end, said capsule containing a booster charge at its closed extremity in propagating relationship to the end of said cord in the bore and having its other extremity crimped on said cord;
  • SAMUEL FEINBERG Primary Examiner.
  • SAMUEL W. ENGLE Examiner.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Description

Sept. 14, 1965 J. COULSON CONNECTOR FOR EXPLOSIVE CORDS Filed Aug. 2, 1963 INVENTOR JOHN R. COULSON United States Patent 3,205,818 CONNECTOR FOR EXPLOSIVE CGRDS John R. Coulson, Wayne, NJ., assiguor to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware Filed Aug. 2, 1963, Ser. No. 299,603 4 Claims. (Cl. 102-47) This invention relates to a device for effectively and safely securing a length of low energy connecting cord and a detonating fuse in operative relationship to one another so that a detonation stimulus can be propagated from the fuse to the cord or, conversely, from the cord to the fuse.
Recently, a novel detonation transmitting cord, termed low-energy connecting cord, has been developed. Such cord is described in U.S. Patent 2,982,210 and comprises a continuous core of a detonating explosive, e.g., PETN, RDX, nitromannite, HMX, lead azide, picryl sulfone, etc., at a loading of from 0.5 to 2 grains per foot of length, contained within a sheath of a ductile metal which is subsequently covered with one or more layers of reinforcing and/ or waterproofing material. Due to its ability to propagate a detonation impulse without attendant brisance and because it is free frornthe hazards associated with electric initiators, in many explosive applications, such as blasting operations, this cord has replaced conventional detonating fuse, i.e., Primacord, and electrical initiators. In many applications, it is desirable to use this cord in conjunction with detonating fuse, the low-energy connecting cord being used in sections of the blasting assembly where brisance would be undesirable and the detonating fuse being used where a detonation stimulus of greater magnitude is needed or, in any case, would not be objectionable. In such assemblies, it is necessary to secure the ends of the lengths of the low energy connecting cord and the detonating fuse together in abutting relationship so that the detonation impulse from one detonation-transmitting means, i.e., the fuse or the cord, will be reliably propagated to the other detonation transmitting means. Heretofore the ends have been held in the requisite abutting relationship by metal clips, for example, of the clothespin type, which have not been satisfactory. Not only do clips of this type fail in many cases to hold the cord and fuse in operative arrangement, they provide a unit in which there is a relatively great susceptibility to accidental actuation by stray electric currents and which will shatter to produce undesirable shrapnel upon detonation.
These and other deficiencies are overcome by this invention which provides a connector for explosive cords which comprises a tube of an electrically nonconductive material having at least one open end, a transverse slot intermediate the ends of the tube and communicating with its bore, the walls of the slot providing means for accepting and engaging a first explosive cord in a recessed position in the tube at substantially right angles to its longitudinal axis, and means in said bore for retaining the end of a second explosive cord in said tube in propa gating relationship to said first cord.
In a particularly preferred embodiment of this invention, a booster charge of high velocity detonating explosive is interposed between, and in propagating relationship to, the end of the second cord in the bore of the tube and the slot for the firstcord, the booster charge being adapted to transmit a detonation stimulus from one of said cords to the other.
The term explosive cord as used herein is meant to include both the newly developed low-energy connecting cord and conventional detonating fuse.
"ice
The term transverse slot is intended to require that the slot extend completely across the tube at an angle to its longitudinal axis.
The first cord should be recessed sufiiciently to allow propagation between it and the second explosive cord or between it and a booster charge if a booster charge is required. Although it is not essential in all cases, it is preferred that the exposed core of the second cord be essentially in contact with the wall of the first cord. For example, low energy connecting cord having a core of PETN will pick up the detonation from Primacord if it is flush or nearly flush; however, low energy connecting cord having a core of 2 gr./ft. lead azide will pick up a detonation from a cord having a cord of PETN at a loading of a 4 gr./ft. contained in a sheath of rayon braid and a polyethylene jacket across a space of about one inch.
The parts of the connector may be more clearly illustrated by reference to the accompanying drawings in which:
FIGURE 1 is a view of one form of a connector in accordance with this invention in longitudinal cross section;
FIGURE 2 is a perspective view of the assembly with a length of detonating fuse and a length of connecting cord inserted;
FIGURE 3 is a view in partial cross-section of an alternative embodiment of the connector of this invention;
FIGURE 4 is a view in partial cross-section of still another embodiment of the connector of this invention; and
FIGURE 5 is an enlarged perspective view of the retaining clip in the connector of FIGURE 4.
Referring to the drawings in more detail, in FIGURE 1, 1 is a tube of a nonconductive material having an open extremity A and a closed extremity B. Slot 2 is provided near extremity B and is essentially perpendicular to the longitudinal axis of the shell. The slot is provided with resilient projections 3 and terminates in recessed channel 4- which is here shown as circular and which is adapted to receive detonating fuse transversely therethrough. The bore 5 of the tube 1 proceeds from open extremity A and communicates with channel 4 through opening 6. A booster charge 7 of a high velocity detonating explosive is contained in capsule 16 which is crimped to the end of low energy connecting cord 8 within the shell and is contiguous to opening 6 which corrnnunicates with channel 4 provided for the detonating fuse. As may be seen from the partial cut away view, the low energy connecting cord comprises core 9 of detonating composition, metal sheath l0 and .a countering 11 of a waterproof composition. Shoulder projection 17, which may be one continuous annular projection or a plurality of individual projections, provides means in the bore which permit forceful insertion of capsule 16 from the open end A of tube 1 but resist its withdrawal thereby retaining cord 8 in the bore of tube 1.
In FIGURE 2, the connector of FIGURE 1 is shown with a length of detonating fuse 15 in channel 4 and held in place by projections 3. Low energy connecting cord is contained in bore 5 of tube 1.
In FIGURE 3, the elements are again as in FIGURE 1, however, in this embodiment, both ends of the tube are open and therefore slot 2 is best defined as terminating in two aligned apertures 4a, one at each of its ends. The alignment of these apertures is such that they position the explosive cord, e.g., detonating fuse, with respect to booster capsule 7 in the same manner as channel 4 (FIGURE 1). In addition, slot 2 is angled to provide greater holding power and one or more ribs 19 are provided to insure a snug fit between the booster capsule and the inner wall of tube 1. A thin rib or rudder 2t reinforces the slotted portion of the tube and strengthens the grip of the tubular connector on the detonating fuse. This strengthening also could be accomplished by increasing the wall thickness or by using a more rigid nonconductive material.
In FIGURE 4, the elements are again as in FIGURE 1, however, in this embodiment the booster charge 7 is a pressed pellet contiguous to opening 6 which communicates between bore and channel 4. Clip 12 is provided to engage the low-energy connecting cord with its cut end in propagating relationship to the booster charge 7. The clip has projections 13 which extend from its interior surface and cut into the countering of the low energy connecting cord and an oppositely disposed serrated edge 14 which grips the inner wall of tube 1.
FIGURE 5 is an enlarged perspective view of the clip.
In operation, the low-energy connecting cord is inserted into the bore of the tubular shell so that the cut end of the cord is in propagating relationship to the slot for the detonating fuse, either directly or through booster charge 7. As shown, booster charge 7 can be contained in a capsule which is crimped to the inserted end of the low-energy connecting cord or may be a pressed pellet of an explosive composition. When the booster charge is contained in a capsule, the cord may be forcefully inserted into the bore of the tube past shoulder projections 17 with the capsule containing the booster charge already crimped on the end of the cord. Alternatively, in embodiments where the tube is open at both ends, as in FIGURE 3, the cord is inserted into the bore of the tube past shoulder 17, i.e., the tube may be slipped over the cord, the capsule containing the booster charge crimped on the end of the cord and the capsule positioned in the bore of the tube with the shoulder 17 and the rib I9 retaining the cord in the bore of the tube. The detonating fuse is inserted into slot 2 which preferably is flared for easy insertion of the fuse and is pulled down past resilient projections 3 which retain the fuse in aperture 4. According to the requirements of the blasting assembly, either the detonating fuse or the low-energy connecting cord can be the main line, the other cord then being the branch line. In situations in which the low-energy connecting cord is used as the main line, the detonation impulse is propagated to booster charge 7 by the explosive core 9 of cord 8. When booster charge 7 is initiated, the detonation impulse produced is suflicient to initiate the detonating fuse. On the other hand, if the detonating fuse is the main line, the brisance of this fuse, as a detonation impulse passes through opening 6, initiates the core 9 of cord 8 directly so there is no need for a booster charge.
The connector of this invention is particularly useful in nonelectric delay blasting assemblies which provide insurance from cut offs due to ground movement and also permit bottom hole priming while avoiding the hazards of accidental actuation by stray electric currents, e.g., electrostatic discharges, radio frequency energy, and stray currents encountered with electric initiators. Since shell 1 is of an electrically nonconductive plastic material, there is no danger of accidental, premature initiation of the assembly due to the build-up of charges or instantaneous surges of electricity through the unit. Disintegration of the plastic material of the shell upon detonation of the cords is not hazardous to persons or equipment in the vicinity.
The tubular nonconductive shell which is critical to our invention must have sufficient flexibility to enable the cords to be connected with relative ease yet must be rigid enough to withstand pressures and abrasive action present in blasting operations. Accordingly, plastic materials such as high density polyethylene, polypropylene, acetal resins, polytetrafiuoroethylene, nylon, unplasticized polyvinyl chloride, polystyrene, acrylic polymers, and phenolic resins having characteristics of rigidity, tear resistance, and a flexibility are suitable for use as tube 1. These materials are particularly suitable because of their high resistance to sear and deterioration in outside use. The shell of the connectors can be machined or, preferably, formed by injection molding.
The booster charge present to insure initiation of the receptor charge is a pressed, high velocity detonating explosive, for example a pellet of pressed waxed RDX or a pellet of pressed pentolite or a similar composition. Placing the booster charge in a tubular capsule, which is attached, e.g., by crimping, to the end of the low energy connecting cord, insures against damage to the ends of the cord and maintains a waterproof seal at the ends. The loading of the booster charge will preferably be about 1.5 to 2.0 grains. A booster charge of 1.8 grains of finely divided PETN in a coined bottom shell is particularly preferred.
Many variations of the above described assembly are within the scope of the invention. It is intended therefore to be limited only by the following claims.
What is claimed is:
1. In combination, a connector comprising an electrically-nonconductive tube having a substantially cylindrical bore extending its entire length; a transverse slot for accepting a length of detonating fuse, extending through the side of the tube intermediate its ends in a direction generally normal to the bores longitudinal axis and terminating in two aligned apertures, one at each end of the slot, the alignment being such that a straight line connecting the apertures intersects the longitudinal axis of said bore at substantially right angles, and the Walls of said slot providing resilient projections for positioning and firmly engaging said fuse in said apertures; reinforcing means integral with the exterior surface of said tube opposite said slot and extending in the direction of said longitudinal axis; a single length of low-energy connecting cord extending into said bore through its first end; and a. booster capsule snugly seated in said bore and having an integrally closed extremity contiguous to the side of said apertures nearest the bores said first end, said capsule containing a booster charge at its closed extremity in propagating relationship to the end of said cord in the bore and having its other extremity crimped on said cord; the said first end of the bore being provided with at least one integral projection for abutting the crimped extremity of the capsule and preventing its withdrawal from said first end, said bore being of sufficient diameter from its second end to said projection at its other end to permit insertion of said capsule into the bore through said second end and its passage past the slot until said integrally closed extremity is contiguous to said nearest side of the apertures.
2. The combination of claim 1 wherein the detonating fuse is firmly engaged in said apertures in propagating relationship to said booster charge.
3. In combination, a connector comprising an electrically-nonconductive tube closed at one end and having a substantially cylindrical bore extending through its other end and running part of its length; a transverse slot between said closed end and the internal end of said bore for accepting a length of detonating fuse, said slot extending through a side of the tube in a direction generally normal to the bores longitudinal axis and terminating in a channel which communicates with said bore and intersects said axis at substantially right angles, the walls of said slot providing at least one resilient projection intermediate said channel and the outside surface of the tube for positioning and firmly engaging said fuse in said channel at substantially right angles to said axis; a single length of low-energy connecting cord extending into said bore through its open end; and a booster capsule snugly seated in said bore and having an integrally closed extremity adjacent to the side of said channel nearest the bores open end, said capsule containing a booster charge at its closed extremity in propagating relationship to the end of said cord in the bore and having its other extremity crimped on said cord; the open end of said bore being provided with at least one integral projecting means for permitting forceful insertion of said crimped capsule into the bore, said means abutting the crimped extremity of the inserted capsule and resisting its withdrawal from the bore, and said booster charge within the inserted capsule being in propagating relationship to said channel.
4. The combination of claim 3 wherein the detonating fuse is firmly engaged in said channel in propagating relationship to said booster charge.
References Cited by the Examiner UNITED STATES PATENTS 1,021,934 4/12 Kellogg 102-27 2,587,694 3/52 Chalmers et al 102-27 2,715,365 8/55 Godchaux et a1. 10227 2,952,206 9/60 Becksted 10227 3,020,844 2/62 Miller 10227 FOREIGN PATENTS 741,868 12/55 Great Britain.
SAMUEL FEINBERG, Primary Examiner. SAMUEL W. ENGLE, Examiner.

Claims (1)

  1. 3. IN COMBINATION, A CONNECTOR COMPRISING AN ELECTRICALLY-NONCONDUCTIVE TUBE CLOSED AT ONE END AND HAVING A SUBSTANTIALLY CYLINDRICAL BORE EXTENDING THROUGH ITS OTHER END AND RUNNING PART OF ITS LENGTH; A TRANSVERSE SLOT BETWEEN SAID CLOSED END AND THE INTERNAL END OF SAID BORE FOR ACCEPTING A LENGTH OF DETONATING FUSE, SAID SLOT EXTENDING THROUGH A SIDE OF THE TUBE IN A DIRECTION GENERALLY NORMAL TO THE BORE''S LONGITUDINAL AXIS AND TERMINATING IN A CHANNEL WHICH COMMUNICATES WITH SAID BORE AND INTERSECTS SAID AXIS AT SUBSTANTIALLY RIGHT ANGLES, THE WALLS OF SAID SLOT PROVIDING AT LEAST ONE RESILIENT PROJECTION INTERMEDIATE SAID CHANNEL AMD THE OUTSIDE SURFACE OF THE TUBE FOR POSITIONING AND FIRMLY ENGAGING SAID FUSE IN SAID CHANNEL AT SUBSTANTIALLY RIGHT ANGLES TO SAID AXIS; A SINGLE LENGTH OF LOW-ENERGY CONNECTING CORD EXTENDING INTO SAID BORE THROUGH ITS OPEN END; AND A BOOSTER CAPSULE SNUGLY SEATED IN SAID BORE AND HAVING AN INTEGRALLY CLOSED EXTREMITY ADJACENT TO THE SIDE OF SAID CHANNEL NEAREST THE BORE''S OPEN END, SAID CAPSULE CONTAINING A BOOSTER CHARGE AT ITS CLOSED EXTREMITY IN PROPAGATING RELATIONSHIP TO THE END OF SAID CORD IN THE BORE AND HAVING ITS OTHER EXTREMITY CRIMPED ON SAID CORD; THE OPEN END OF SAID BORE BEING PROVIDED WITH AT LEAST ONE INTEGRAL PROJECTING MEANS FOR PERMITTING FORCEFUL INSERTION OF SAID CRIMPED CAPSULE INTO THE BORE, SAID MEANS ABUTTING THE CRIMPED EXTREMITY OF THE INSERTED CAPSULE AND RESISTING ITS WITHDRAWAL FROMN THE BORE, AND SAID BOOSTER CHARGE WITHIN THE INSERTED CAPSULE BEING IN PROPAGATING RELATIONSHIP TO SAID CHANNEL.
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Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3342133A (en) * 1964-02-14 1967-09-19 Nitroglycerin Ab Low energy cord assemblies
US3426681A (en) * 1967-06-15 1969-02-11 Combustion Eng Expansion of tubes into tube sheet by use of explosives
US3455242A (en) * 1967-08-24 1969-07-15 Atlas Chem Ind Self-adjusting detachable fuse clip for cartridges
DE2255106A1 (en) * 1971-12-01 1973-06-07 Nitro Nobel Ab CONNECTING ELEMENT FOR IGNITING A LOW ENERGY CONNECTOR
US3789761A (en) * 1973-02-02 1974-02-05 Us Army Propagation transfer arrangement
US3993001A (en) * 1975-08-18 1976-11-23 Tetra Plastics, Inc. Explosive expansion means for attaching tubes to tube sheets
US4112845A (en) * 1976-07-28 1978-09-12 The United States Of America As Represented By The Secretary Of The Navy Apparatus for detonating across a gap
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
US4299167A (en) * 1980-04-28 1981-11-10 E. I. Du Pont De Nemours & Co. Nonelectric delay initiator
US4426933A (en) 1981-04-27 1984-01-24 E. I. Du Pont De Nemours And Company Non-electric blasting assembly
US4442776A (en) * 1982-04-21 1984-04-17 The United States Of America As Represented By The Secretary Of The Air Force Detonator block
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
US4714017A (en) * 1986-09-26 1987-12-22 Cxa Ltd./Cxa Ltee Pyrotechnic variable delay connector
US4815382A (en) * 1987-11-25 1989-03-28 Eti Explosives Technologies International Inc. Connector and detonator/connector assembly for initiating explosive primers with low-energy detonating cord
US5171935A (en) * 1992-11-05 1992-12-15 The Ensign-Bickford Company Low-energy blasting initiation system method and surface connection thereof
GB2249372B (en) * 1990-11-05 1995-01-18 Ensign Bickford Co Low-energy blasting initiating system surface connector block
US5423263A (en) * 1994-04-01 1995-06-13 Dyno Nobel, Inc. Detonator-to-shock tube ignition transfer connector
US5463955A (en) * 1994-02-08 1995-11-07 Ici Canada Inc. Transmission tube connector
US5499581A (en) * 1994-05-26 1996-03-19 The Ensign-Bickford Company Molded article having integral displaceable member or members and method of use
WO1996011375A1 (en) * 1994-10-07 1996-04-18 Austin Powder Company Method and apparatus for transmission of a detonator initiation to a detonating cord
US5524547A (en) * 1994-06-03 1996-06-11 Ici Canada Inc. Signal tube and detonator cord connector
US5594196A (en) * 1995-04-20 1997-01-14 Ireco, Inc. Shock tube surface connector
WO1997015537A1 (en) * 1995-10-27 1997-05-01 The Ensign-Bickford Company Connector block for blast initiation systems
US5703320A (en) * 1996-01-18 1997-12-30 The Ensign Bickford Company Connector for blast initiation system
US5792975A (en) * 1994-05-26 1998-08-11 The Ensign-Bickford Company Connector block having detonator-positioning locking means
US6123025A (en) * 1991-10-30 2000-09-26 Orica Explosives Technology Pty Ltd. Low noise, low shrapnel detonator assembly for initiating signal transmission lines
WO2001084070A1 (en) * 2000-04-28 2001-11-08 Orica Explosives Technology Pty Ltd Blast initiation device
US20040055494A1 (en) * 2002-09-25 2004-03-25 O'brien John P. Detonator junction for blasting networks
US20080257191A1 (en) * 2004-05-19 2008-10-23 Jose Maria Ayensa Muro Direct Load, Detonator-Less Connector For Shock Tubes
US8033222B1 (en) * 2006-09-27 2011-10-11 Dyno Nobel Inc. Line-locking connector clip

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1021934A (en) * 1912-04-02 W B Kellogg Cap and fuse holder for dynamite cartridges.
US2587694A (en) * 1949-09-23 1952-03-04 Canadian Safety Fuse Company L Fuse igniting and connecting device
US2715365A (en) * 1947-05-09 1955-08-16 Ii Paul Leon Godchaux Demolition firing device
GB741868A (en) * 1952-10-24 1955-12-14 Ici Ltd Improvements in or relating to prepared safety fuses
US2952206A (en) * 1957-05-10 1960-09-13 Austin Powder Co Fuse connector
US3020844A (en) * 1958-12-29 1962-02-13 Du Pont Explosive device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1021934A (en) * 1912-04-02 W B Kellogg Cap and fuse holder for dynamite cartridges.
US2715365A (en) * 1947-05-09 1955-08-16 Ii Paul Leon Godchaux Demolition firing device
US2587694A (en) * 1949-09-23 1952-03-04 Canadian Safety Fuse Company L Fuse igniting and connecting device
GB741868A (en) * 1952-10-24 1955-12-14 Ici Ltd Improvements in or relating to prepared safety fuses
US2952206A (en) * 1957-05-10 1960-09-13 Austin Powder Co Fuse connector
US3020844A (en) * 1958-12-29 1962-02-13 Du Pont Explosive device

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3342133A (en) * 1964-02-14 1967-09-19 Nitroglycerin Ab Low energy cord assemblies
US3426681A (en) * 1967-06-15 1969-02-11 Combustion Eng Expansion of tubes into tube sheet by use of explosives
US3455242A (en) * 1967-08-24 1969-07-15 Atlas Chem Ind Self-adjusting detachable fuse clip for cartridges
DE2255106A1 (en) * 1971-12-01 1973-06-07 Nitro Nobel Ab CONNECTING ELEMENT FOR IGNITING A LOW ENERGY CONNECTOR
US3789761A (en) * 1973-02-02 1974-02-05 Us Army Propagation transfer arrangement
US3993001A (en) * 1975-08-18 1976-11-23 Tetra Plastics, Inc. Explosive expansion means for attaching tubes to tube sheets
US4112845A (en) * 1976-07-28 1978-09-12 The United States Of America As Represented By The Secretary Of The Navy Apparatus for detonating across a gap
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
US4248152A (en) * 1979-01-24 1981-02-03 E. I. Du Pont De Nemours & Company Field-connected explosive booster for propagating a detonation in connected detonating cord assemblies containing low-energy detonating cord
US4299167A (en) * 1980-04-28 1981-11-10 E. I. Du Pont De Nemours & Co. Nonelectric delay initiator
US4426933A (en) 1981-04-27 1984-01-24 E. I. Du Pont De Nemours And Company Non-electric blasting assembly
US4442776A (en) * 1982-04-21 1984-04-17 The United States Of America As Represented By The Secretary Of The Air Force Detonator block
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
US4714017A (en) * 1986-09-26 1987-12-22 Cxa Ltd./Cxa Ltee Pyrotechnic variable delay connector
US4815382A (en) * 1987-11-25 1989-03-28 Eti Explosives Technologies International Inc. Connector and detonator/connector assembly for initiating explosive primers with low-energy detonating cord
GB2249372B (en) * 1990-11-05 1995-01-18 Ensign Bickford Co Low-energy blasting initiating system surface connector block
US6123025A (en) * 1991-10-30 2000-09-26 Orica Explosives Technology Pty Ltd. Low noise, low shrapnel detonator assembly for initiating signal transmission lines
US5171935A (en) * 1992-11-05 1992-12-15 The Ensign-Bickford Company Low-energy blasting initiation system method and surface connection thereof
US5463955A (en) * 1994-02-08 1995-11-07 Ici Canada Inc. Transmission tube connector
US5423263A (en) * 1994-04-01 1995-06-13 Dyno Nobel, Inc. Detonator-to-shock tube ignition transfer connector
AU696967B2 (en) * 1994-04-01 1998-09-24 Dyno Nobel, Inc Detonator-to-shock tube ignition transfer connector
US5792975A (en) * 1994-05-26 1998-08-11 The Ensign-Bickford Company Connector block having detonator-positioning locking means
US5499581A (en) * 1994-05-26 1996-03-19 The Ensign-Bickford Company Molded article having integral displaceable member or members and method of use
US5524547A (en) * 1994-06-03 1996-06-11 Ici Canada Inc. Signal tube and detonator cord connector
WO1996011375A1 (en) * 1994-10-07 1996-04-18 Austin Powder Company Method and apparatus for transmission of a detonator initiation to a detonating cord
US5594196A (en) * 1995-04-20 1997-01-14 Ireco, Inc. Shock tube surface connector
WO1997015537A1 (en) * 1995-10-27 1997-05-01 The Ensign-Bickford Company Connector block for blast initiation systems
US5703319A (en) * 1995-10-27 1997-12-30 The Ensign-Bickford Company Connector block for blast initiation systems
US5703320A (en) * 1996-01-18 1997-12-30 The Ensign Bickford Company Connector for blast initiation system
WO2001084070A1 (en) * 2000-04-28 2001-11-08 Orica Explosives Technology Pty Ltd Blast initiation device
US6513437B2 (en) 2000-04-28 2003-02-04 Orica Explosives Technology Pty Ltd. Blast initiation device
US20040055494A1 (en) * 2002-09-25 2004-03-25 O'brien John P. Detonator junction for blasting networks
US20080257191A1 (en) * 2004-05-19 2008-10-23 Jose Maria Ayensa Muro Direct Load, Detonator-Less Connector For Shock Tubes
US7699004B2 (en) * 2004-05-19 2010-04-20 Maxamcorp, S.A.U. Direct load, detonator-less connector for shock tubes
US8033222B1 (en) * 2006-09-27 2011-10-11 Dyno Nobel Inc. Line-locking connector clip

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