High velocity ignition system for ammunition

Patent metadata

Field	Value
Publication number	US-9921039-B2
Application number	US-201615175885-A
Country	US
Kind code	B2
Filing date	Jun 7, 2016
Priority date	Mar 15, 2013
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A high velocity ignition system for ammunition including an casing, a primer, a payload, a first propellant region, a flash tube, a second propellant and at least one channel. The casing has a base portion and a forward portion. The primer is provided in the base portion. The payload is provided proximate the forward portion. The first propellant region is located in the casing intermediate the primer and the payload. The flash tube substantially extends between the primer and the first propellant region. The second propellant region is located in the casing intermediate the first propellant region and the base portion. The at least one channel extends between the first propellant region and the second propellant region. A separator with a forward extending cup and a rearward extending cup has a cylindrical portion that engages the inside surface of the casing, spans the internal distance in the casing, and defines flash pathways between the primer and main propellant and between the main propellant and the secondary propellant.

First claim

The invention claimed is:

1. A shotgun shell comprising:
a shotgun shell casing having a base portion and a forward portion configured for a shotgun;
a primer provided in the base portion;
a payload being one of a plurality of shotgun shell shot pellets and a shotgun shell slug provided in the forward portion;
separation structure provided rearward of the payload, the separation structure defining
a first propellant region located in the casing intermediate the primer and the payload; and
a second propellant region located in the casing intermediate the first propellant region and the base portion;

the separation structure having:
a flash tube substantially extending between the primer and the first propellant region;
a divider separating the first propellant region from the second propellant region, at least one channel extending between the first propellant region and the second propellant region;

the shotgun shell further comprising propellant in the first propellant region and propellant in the second propellant region.

2. The shotgun shell of claim 1 , wherein the second propellant region extends at least partially around the flash tube.

3. The shotgun shell of claim 1 , wherein the second propellant region has a height that is less than a height of the flash tube.

4. The shotgun shell of claim 1 , wherein the first propellant region and the second propellant region are in a spaced-apart relationship.

5. The shotgun shell of claim 1 , and further comprising a separator with an integral flash tube for confronting the primer and defining a plurality of flash path ways between the first propellant region and the second propellant region, wherein the separator provides an upwardly facing cup portion and a downwardly facing cup portion.

6. The shotgun shell of claim 1 , wherein propellant in the first propellant region is different than propellant in the second propellant region.

7. A method of increasing velocity of ammunition without increasing a maximum pressure rating for a gun system in which the ammunition is used, the method comprising:
activating a primer to cause a first flame to be emitted therefrom;
directing the first flame through a flash tube towards a first propellant region and past a second propellant region, the second propellant region position laterally of the flashtube and rearward of the first propellant region;
igniting the first propellant region with the first flame;
directing a second flame from the first propellant region to the second propellant region through at least one channel, wherein the second propellant region is in a spaced-apart configuration from the first propellant region;
igniting the second propellant region with the second flame; and
propelling the payload away from the casing with a combined force generated by the ignition of the first propellant region and the second propellant region.

8. The method of claim 7 , wherein the payload is propelled away from the casing at a rate that is greater than a rate at which igniting the first propellant region would propel the payload from the casing.

9. The method of claim 7 , wherein sequential igniting of the first propellant region and the second propellant region flattens a pressure time curve compared to a pressure time curve generated only by ignition of the first propellant region.

10. The method of claim 7 , wherein a total pressure generated by sequential igniting of the first propellant region and the second propellant region is less than a total pressure generated by simultaneous ignition of the first propellant region and the second propellant region.

11. The method of claim 7 , wherein the flash tube substantially extends between the first propellant region and the second propellant region.

12. The method of claim 7 , wherein there is a delay between igniting the first propellant region and igniting the second propellant region.

13. The method of claim 12 , wherein upon firing the payload has left the casing when the secondary propellant is ignited.

14. The method of claim 7 , wherein the second propellant region extends at least partially around the flash tube.

15. The method of claim 7 , wherein the second propellant region has a height that is less than a height of the flash tube.

16. The method of claim 7 , and further comprising placing wading between the first propellant region and the second propellant region, wherein the wading extends around the at least one channel.

17. The method of claim 7 , wherein propellant in the first propellant region is different than propellant in the second propellant region.

18. The method of claim 7 , wherein the payload comprises a plurality of shot, a slug or combination thereof.

19. The method of claim 7 , and further comprising mounting the primer, the flash tube, the first propellant region, the second propellant region, and the at least one channel in an casing.

Assignees

• Vista Outdoor Operations Llc

Inventors

• Billings Chris

Classifications

• F42B7/04 Primary

  of pellet type · CPC title

• F42B5/16 Primary

  characterised by composition or physical dimensions or form of propellant charge, {with or without projectile,} or powder (chemical composition C06B; {F42B5/24 takes precedence}) · CPC title

• F42B7/02

  Cartridges, i.e. cases with propellant charge and missile · CPC title