Variable stand-off assembly

Patent metadata

Field	Value
Publication number	US-10801822-B2
Application number	US-201816024207-A
Country	US
Kind code	B2
Filing date	Jun 29, 2018
Priority date	Jun 29, 2018
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

A variable stand-off distance explosive cord assembly for a casing is disclosed. In various embodiments, the assembly includes an explosive cord configured for positioning at a stand-off distance from the casing and a thermally responsive material configured to vary the stand-off distance from a first distance to a second distance.

First claim

What is claimed is:

1. A variable stand-off distance explosive cord assembly for a casing, comprising:
an explosive cord configured for positioning at a stand-off distance from the casing;
a first thermally responsive material configured to vary the stand-off distance from a first distance to a second distance, the first thermally responsive material positioned between the casing and the explosive cord; and
a second thermally responsive material, the second thermally responsive material positioned on a side of the explosive cord opposite the casing and having a coefficient of thermal expansion greater or lesser than the coefficient of thermal expansion of the first thermally responsive material.

2. The variable stand-off distance explosive cord assembly of claim 1 , wherein the explosive cord defines a length along the casing and wherein the first thermally responsive material extends along at least a portion of the length of the explosive cord.

3. The variable stand-off distance explosive cord assembly of claim 2 , wherein the first thermally responsive material comprises a plurality of blocks spaced along the length.

4. The variable stand-off distance explosive cord assembly of claim 2 , wherein the first thermally responsive material extends along the length of the explosive cord.

5. The variable stand-off distance explosive cord assembly of claim 2 , wherein, following ignition of the explosive cord, the first distance is configured to result in a scoring of the casing.

6. The variable stand-off distance explosive cord assembly of claim 5 , wherein, following ignition of the explosive cord, the second distance is configured to result in a cutting through of the casing.

7. The variable stand-off distance explosive cord assembly of claim 6 , wherein the explosive cord is a linear shaped charge.

8. The variable stand-off distance explosive cord assembly of claim 1 , wherein the explosive cord is positioned between the first thermally responsive material and the casing.

9. The variable stand-off distance explosive cord assembly of claim 8 , wherein, following ignition of the explosive cord, the first distance is configured to result in a scoring of the casing.

10. The variable stand-off distance explosive cord assembly of claim 9 , wherein, following ignition of the explosive cord, the second distance is configured to result in a cutting through of the casing.

11. The variable stand-off distance explosive cord assembly of claim 10 , wherein the explosive cord is a linear shaped charge.

12. A rocket motor, comprising:
a casing;
an explosive cord configured for positioning at a stand-off distance from the casing;
a first thermally responsive material configured to vary the stand-off distance from a first distance to a second distance, the first thermally responsive material positioned between the casing and the explosive cord; and
a second thermally responsive material, the second thermally responsive material positioned on a side of the explosive cord opposite the casing and having a coefficient of thermal expansion greater or lesser than the coefficient of thermal expansion of the first thermally responsive material.

13. The rocket motor of claim 12 , wherein the explosive cord defines a length along the casing and wherein the first thermally responsive material extends along at least a portion of the length of the explosive cord.

14. The rocket motor of claim 13 , wherein the first thermally responsive material extends along the length of the explosive cord.

15. The rocket motor of claim 13 , wherein, following ignition of the explosive cord, the first distance is configured to result in a scoring of the casing.

16. The rocket motor of claim 15 , wherein, following ignition of the explosive cord, the second distance is configured to result in a cutting through of the casing.

17. A propellant containing device, comprising:
a casing enclosing an explosive charge;
an explosive cord configured for positioning at a stand-off distance from the casing;
a first thermally responsive material configured to vary the stand-off distance from a first distance to a second distance, the first thermally responsive material positioned between the casing and the explosive cord; and
a second thermally responsive material, the second thermally responsive material positioned on a side of the explosive cord opposite the casing and having a coefficient of thermal expansion greater or lesser than the coefficient of thermal expansion of the first thermally responsive material.

18. The propellant containing device of claim 17 , wherein, following ignition of the explosive cord, the first distance is configured to result in a scoring of the casing, and, following ignition of the explosive cord, the second distance is configured to result in a cutting through of the casing.

Assignees

• Goodrich Corp

Inventors

• Wilson Brian
• Ramirez German

Classifications

• F42B1/028

  characterised by the form of the liner · CPC title

• F42B33/06 Primary

  Dismantling fuzes, cartridges, projectiles, missiles, rockets or bombs ({F42B33/004 and} F42B33/04 take precedence; {elimination of undesirable components of explosives C06B21/0091}) · CPC title

• F42B33/067 Primary

  by combustion (incineration apparatuses or processes for used articles F23G7/003) · CPC title

• F42D5/04

  Rendering explosive charges harmless, e.g. destroying ammunition ({F42B39/14 and F42B39/20 take precedence } ; extracting primers, dismantling ammunition F42B33/04, F42B33/06 {; chemical deactivating of explosives C06B21/0091}); Rendering detonation of explosive charges harmless · CPC title

• F42B33/008

  Cutting explosive or propulsive charges · CPC title