Explosive assembly systems including a linear shaped charge end prime cap apparatus and related methods

Patent metadata

Field	Value
Publication number	US-9778008-B2
Application number	US-201514953312-A
Country	US
Kind code	B2
Filing date	Nov 28, 2015
Priority date	Nov 2, 2015
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

Generally, embodiments of the invention can include a linear shaped charge (LSC) end cap coupling structure adapted for holding an initiator structure adapted to initiate a booster explosive material, the booster explosive material, and the LSC in abutting contact with each other. One embodiment includes a rubber body formed with cavities adapted to receive the LSC, booster, and initiator structure (e.g., detonation cord). One internal cavity can be formed with a plurality of flexible protrusions or fins which are oriented towards a center axis of the preferred embodiment of three cavities configured to impart an interference fit with the initiator structure. Methods related to the invention are also provided.

First claim

The invention claimed is:

1. An explosive assembly structure comprising:
an initiator structure adapted to initiate a booster explosive material;
said booster explosive material;
a linear shaped charge; and
a body comprising an elastomeric material formed with a first and second body portion wherein said second body portion extends away from said first body portion and is formed with stiffening structures coupled to a side of said first body portion and coupled with said second body portion's external surface;
wherein said body forms a first, second, and third cavity section, wherein said first cavity section is formed by a first interior cavity wall having a first distance between opposing sides of said first cavity section, wherein said second cavity section is formed by a second interior cavity wall having a second distance between opposing sides of said second cavity section, wherein said third cavity section is formed by a third interior cavity wall having a third distance between opposing sides of said third cavity section;
wherein said first cavity section is formed to insertably receive said linear shaped charge with a flexible interference fit, wherein said second cavity section is formed to insertably receive said booster explosive material, wherein said first, second and third cavity sections are formed to retain said initiator structure in contact with said booster explosive material and retain said linear shaped charge with an opposing side of said booster explosive material;
wherein said first cavity section is volumetrically larger than said second cavity section, said second cavity section is volumetrically larger than said third cavity section, wherein said third cavity section is formed with a plurality of flexible protrusions configured to impart a flexible interference fit with said initiator structure;
wherein said second and third cavity sections are formed respectively with a common center axis, wherein one side each of said first and third cavity sections respectively define a first and second external opening in said body on opposing sides of said body, wherein said second external opening is formed with a beveled or internally tapering edge surrounding the third interior cavity wall, wherein said first external opening is formed with an edge surrounding the first interior cavity wall.

2. An explosive assembly as in claim 1 , wherein said elastomeric material comprises rubber.

3. A method of assembling and using an explosive assembly comprising:
providing an explosive assembly structure comprising:
an initiator structure adapted to initiate a booster explosive material;
said booster explosive material;
a linear shaped charge; and
a body comprising an elastomeric material formed with a first and second body portion wherein said second body portion extends away from said first body portion and is formed with stiffening structures coupled to a side of said first body portion and coupled with said second body portion's external surface;
wherein said body forms a first, second, and third cavity section, wherein said first cavity section is formed by a first interior cavity wall having a first distance between opposing sides of said first cavity section, wherein said second cavity section is formed by a second interior cavity wall having a second distance between opposing sides of said second cavity section, wherein said third cavity section is formed by a third interior cavity wall having a third distance between opposing sides of said third cavity section;
wherein said first cavity section is formed to insertably receive said linear shaped charge with a flexible interference fit, wherein said second cavity section is formed to insertably receive said booster explosive material, wherein said first, second and third cavity sections are formed to retain said initiator structure in contact with said booster explosive material and retain said linear shaped charge with an opposing side of said booster explosive material;
wherein said first cavity section is volumetrically larger than said second cavity section, said second cavity section is volumetrically larger than said third cavity section, wherein said third cavity section is formed with a plurality of flexible protrusions configured to impart a flexible interference fit with said initiator structure;
wherein said second and third cavity sections are formed respectively with a common center axis, wherein one side each of said first and third cavity sections respectively define a first and second external opening in said body on opposing sides of said body, wherein said second external opening is formed with a beveled or internally tapering edge surrounding the third interior cavity wall, wherein said first external opening is formed with an edge surrounding the first interior cavity wall;

positioning said explosive assembly in proximity to a target; and
detonating said explosive assembly by actuating an initiator structure.

4. A method as in claim 3 , wherein said elastomeric material comprises rubber.

5. An explosive assembly structure comprising:
an initiator structure adapted to initiate a booster explosive material;
said booster explosive material;
a linear shaped charge (LSC) comprising a primary explosive material, wherein said LSC has a central longitudinal axis within said primary explosive material of said LSC, wherein said central longitudinal axis is on a symmetrical plane of said LSC; and
a body comprising an elastomeric material formed with a first and second body portion wherein said second body portion extends away from said first body portion and is formed with stiffening structures coupled to a side of said first body portion and coupled with said second body portion's external surface;
wherein said body forms a first, second, and third cavity section, wherein said first cavity section is formed by a first interior cavity wall having a first distance between opposing sides of said first cavity section, wherein said second cavity section is formed by a second interior cavity wall having a second distance between opposing sides of said second cavity section, wherein said third cavity section is formed by a third interior cavity wall having a third distance between opposing sides of said third cavity section;
wherein said first cavity section is formed to insertably receive said LSC with a flexible interference fit, wherein said second cavity section is formed to insertably receive said booster explosive material, wherein said first, second and third cavity sections are formed to retain said initiator structure in contact with said booster explosive material and retain said LSC with an opposing side of said booster explosive material;
wherein said first cavity section is volumetrically larger than said second cavity section, said second cavity section is volumetrically larger than said third cavity section, wherein said third cavity section is formed with a plurality of flexible protrusions configured to impart a flexible interference fit with said initiator structure;
wherein said second and third cavity sections are formed respectively with a common center axis, wherein one side each of said first and third cavity sections respectively define a first and second external opening in said body on opposing sides of said body, wherein said second external opening is formed with a beveled or internally tapering edge surrounding the third interior cavity wall, wherein said first external opening is formed with an edge surrounding the first interior cavity wall;
wherein said central longitudinal axis is aligned with said common center axis.

6. An explosive assembly structure comprising:
an initiator structure adapted to initiate a booster explosive material;
said booster explosive material;
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Assignees

• Us Navy

Inventors

• Scheid Eric
• Thomas Dan
• Moan Brad
• Gailey Tom

Classifications

• F42D1/043 Primary

  Connectors for detonating cords and ignition tubes, e.g. Nonel tubes (mounting of detonators in blasting cartridges F42B3/26) · CPC title

• F42B3/08

  with cavities in the charge, e.g. hollow-charge blasting cartridges · CPC title

• F42B3/26

  Arrangements for mounting initiators; Accessories therefor, e.g. tools · CPC title

• F42B1/028

  characterised by the form of the liner · CPC title

• F42B3/087

  Flexible or deformable blasting cartridges, e.g. bags or hoses {for slurries}(loaded cartridge bags F42B5/38) · CPC title