Claims
- 1. An explosive coupler for operatively joining a low-energy detonating cord (LEDC) to a percussion-actuated detonator comprising:
- (a) a plastic connecting block housing a coupling charge of shock-sensitive detonating explosive in linear array in a bore therein, said bore being completely spanned by a thin closure membrane so as to adapt it to retain said linear coupling charge; and
- (b) detonator-engaging means on said block adapted to engage a detonator having a percussion-sensitive ignition charge therein at its actuation end in a manner such that said coupling charge is perpendicular to said detonator and held in initiating proximity to said detonator's percussion-sensitive ignition charge.
- 2. An explosive coupler of claim 1 wherein said block contains a cord-receiving aperture lying on a longitudinal axis which is perpendicular to the longitudinal axis of said explosive-containing bore, and parallel to the detonator which said block is adapted to engage, said aperture in said block being adjacent said thin membrane so that LEDC threaded through said aperture is directed to pass in close enough proximity to said coupling charge as to initiate it.
- 3. An explosive coupler of claim 2 wherein said shock-sensitive detonating explosive is lead azide powder.
- 4. An assembly for the delay initiation of an explosive primer by means of a low-energy detonating cord comprising (a) an explosive coupler comprising a plastic connecting block housing a coupling charge of shock-sensitive detonating explosive in linear array in a bore therein, and, (b) in engagement with said block, a delay detonator having a percussion-sensitive ignition charge therein at its actuation end, said coupling charge being perpendicular to said detonator and held in initiating proximity to said detonator's percussion-sensitive ignition charge.
- 5. An assembly of claim 4 wherein said detonator-engaging means is a thin-walled tubular fitting which holds said detonator by interference fit.
- 6. An assembly of claim 4 wherein said detonator-engaging means is a box-like member having a yieldable aperture which grips a circumferential closure crimp in said detonator's shell.
- 7. An assembly of claim 4 wherein said block is in engagement with a circumferential crimp on the outer shell of said detonator.
- 8. An assembly of claim 7 wherein the engagement between said block and said crimp is made via a channel member on said block.
- 9. An assembly of claim 8 wherein said channel member engages said crimp in a slidable manner.
- 10. A connecting block for explosively coupling low-energy detonating cord (LEDC) to a percussion-actuated detonator comprising a substantially L-shaped plastic member having first and second perpendicular arms of substantially tubular configuration, said first arm having an open passageway adapted to have LEDC threaded therethrough, and said second arm having a bore adapted to receive a linearly array a coupling charge of shock-sensitive detonating explosive, and to retain said charge adjacent the passageway in said first arm through which the LEDC is to be threaded, said second arm being adapted to engage a percussion-actuated detonator in a manner such that (a) said detonator is positioned substantially parallel to said first arm and substantially perpendicular to the bore in said second arm, and (b) said detonator's percussion-sensitive ignition charge is held in initiatable proximity with respect to the coupling charge adapted to be linearly arrayed in said bore.
- 11. A connecting block of claim 10 wherein said first arm has gripping means on its external surface adapted to engage the wall of a cord-threading aperture in or associated with a substantially cylindrical explosive primer when said first arm is inserted therein.
- 12. A connecting block of claim 11 wherein stop means projects into the bore in said second arm adjacent said open passageway, said stop means being adapted to position a sealed, explosive-containing shell adjacent said open passageway.
- 13. A connecting block of claim 12 wherein said stop means has an open structure which allows direct communication between said bore and said passageway, whereby a portion of the end of a shell to be positioned in said bore is adapted to be exposed to said passageway.
- 14. A connecting block of claim 12 wherein said second arm is provided with a channel member adapted to slidably engage said detonator.
- 15. A connecting block of claim 14 wherein said channel member is substantially U-shaped in cross-section with the sides of the U turned inward at their ends whereby they are adapted to grip a circumferential closure crimp in a detonator shell at the detonator's actuation end.
- 16. An explosive primer comprising a substantially cylindrical mass of explosive having
- (a) a cord-receiving perforation and a detonator-receiving cavity substantially on or parallel to its longitudinal axis, said perforation and cavity being spaced apart from one another, and said perforation extending substantially from one end of said cylindrical mass to the other; and
- (b) a block-like cavity for receiving a connecting block adjacent said cord-receiving perforation and said detonator-receiving cavity.
- 17. An explosive primer of claim 16 having an outer plastic jacket containing holes in the block-like cavity portion thereof to allow access to said cord-receiving perforation and said detonator-receiving cavity, said cavity portion of said jacket being provided with means for attaching an explosive coupler connecting block thereto.
- 18. An explosive primer of claim 17 wherein said block-attaching means is a linear rib.
- 19. An explosive coupler for operatively joining a low-energy detonating cord (LEDC) to a percussion-actuated detonator comprising:
- (a) a plastic connecting block housing a coupling charge of shock-sensitive detonating explosive in linear array in a bore therein, said bore being at least partially closed by stop means adapted to position a housing shell for said coupling charge at a desired location; and
- (b) a detonator-engaging means on said block adapted to engage a detonator having a percussion-sensitive ignition charge therein at its actuation end in a manner such that said coupling charge is perpendicular to said detonator and held in initiating proximity to said detonator's percussion-sensitive ignition charge.
- 20. An explosive coupler of claim 19 integrally attached to a plastic tubular member adapted to receive a low-energy detonating cord perpendicular to the linear coupling charge, said tubular member being provided with means of attachment to an explosive primer to hold said tubular member longitudinally outside the primer wall.
- 21. An explosive coupler of claim 19 integrally attached to an end closure cap adapted to fit over the end of an explosive primer.
- 22. An explosive coupler of claim 21 wherein said shock-sensitive detonating explosive is lead azide powder.
- 23. An explosive coupler of claim 19 wherein said block contains a cord-receiving aperture lying on a longitudinal axis which is perpendicular to the longitudinal axis of said explosive-containing bore, and parallel to the detonator which said block is adapted to engage, said aperture in said block being adjacent said block's stop means so that LEDC threaded through said aperture is directed to pass in close enough proximity to said coupling charge as to initiate it.
- 24. An explosive coupler of claim 23 wherein said connecting block has peripheral grooves adapted to mate with ribs formed in the surface of a block-like cavity adapted to accommodate said block.
- 25. An explosive coupler of claim 23 wherein said connecting block is a substantially L-shaped member having first and second perpendicular arms of substantially tubular configuration, said first arm having an open passageway adapted to have a low-energy detonating cord threaded therethrough, said cord-threading aperture in said block constituting a part of said open passageway, and said second arm housing said coupling charge in a bore therein.
- 26. An explosive coupler of claim 25 wherein the first arm of said L-shaped block is substantially tubular and is provided with gripping means on its external surface.
- 27. An explosive coupler of claim 23 wherein said detonator-engaging means is a channel member adapted to slidably engage said detonator whereby the distance between said detonator and the cord-threading aperture in said block can be varied.
- 28. An explosive coupler of claim 27 wherein said channel member is substantially U-shaped in cross-section with the sides of the U turned inward at their ends whereby they are adapted to grip a circumferential closure crimp in a detonator shell at the detonator's actuation end.
- 29. An explosive coupler of claim 23 wherein said coupling charge is housed in a self-contained coupling element comprising a metal shell having an integrally closed end, and its opposite end closed with a plug, the integrally closed end of said shell resting against said stop means in the bore of said connecting block adjacent said cord-threading aperture.
- 30. An explosive coupler of claim 29 wherein said stop means has an open structure which allows direct communication between said metal shell and said cord-threading aperture.
- 31. An explosive coupler of claim 29 wherein said metal shell contains a plastic lining tube ending short of the shell's integrally closed end, said coupling charge being located in the bore of said lining tube and in the space adjacent the shell's integrally closed end.
- 32. An explosive coupler of claim 23 wherein said detonator-engaging means is a yieldable fitting which accepts and holds said detonator in fixed position relative to said cord-threading aperture.
- 33. An explosive coupler of claim 32 wherein said fitting is a box-like member having a yieldable aperture adapted to grip a circumferential closure crimp in a detonator shell.
- 34. An explosive coupler of claim 32 wherein said fitting is a thin-walled tube adapted to hold a detonator by interference fit.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a divisional application of Ser. No. 714,505 filed Mar. 25, 1985, now U.S. Pat. No. 4,718,345, which is a continuation-in-part of application Ser. No. 616,138, filed June 1, 1984, now abandoned.
US Referenced Citations (11)
Non-Patent Literature Citations (2)
Entry |
Austin Technical Data Bulletin ADP 1183: Austin Delay Boosters. |
Atlas Data Sheet 701: Deckmaster/Primemaster. |
Divisions (1)
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Number |
Date |
Country |
Parent |
714505 |
Mar 1985 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
616138 |
Jun 1984 |
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