Ammunition magazine

Patent metadata

Field	Value
Publication number	US-9915487-B2
Application number	US-201615207409-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jan 17, 2012
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

The present disclosure provides ammunition magazine casing and follower systems. The magazine casing may comprise a pair of spines running along a length of an interior rear wall of the magazine casing, the spines being raised in relation to other portions of the interior rear wall and stopping at a point in the magazine casing where an exterior geometry of the magazine casing changes from substantially curved to substantially straight.

First claim

What is claimed is:

1. An ammunition magazine casing comprising:
a pair of spines running along a length of an interior rear wall of the magazine casing, the spines being raised in relation to other portions of the interior rear wall and stopping at a point in the magazine casing where an exterior geometry of the magazine casing changes from substantially curved to substantially straight, wherein the spines and the interior rear wall together define:
a trench between the spines, and
a pair of channels, one on either side of the spines.

2. The ammunition magazine casing of claim 1 ,
further comprising a magazine follower,
wherein the pair of spines are shaped such that a portion of the magazine follower can travel along the spines such that a space created by the channels between an end portion of the follower and the interior rear wall is larger than any space between:
the end portion of the follower and the spines and
the end portion of the follower and the interior rear wall defining the trench.

3. The ammunition magazine casing of claim 1 , wherein the magazine casing is made out of polymer.

4. The ammunition casing of claim 1 , wherein the pair of spines extends to a bottom end of the magazine casing.

5. The ammunition casing of claim 1 , wherein the trench between the spines is wider than each of the channels.

6. An ammunition magazine casing comprising:
a pair of spines running lengthwise along an interior rear wall of the casing, the spines protruding from at least a portion of the interior rear wall and stopping at a point on the interior wall adjacent to an over-insertion stop on an exterior of the casing, wherein the spines and the interior rear wall together define:
a trench between the spines, and
a pair of channels, one on either side of the spines.

7. The ammunition magazine casing of claim 6 ,
wherein the pair of spines are shaped such that a portion of a magazine follower can travel along the spines such that a space created by the channels between an end portion of the follower and the interior rear wall is larger than any space between both:
the end portion of the follower and the spines and
the end portion of the follower and the interior rear wall defining the trench.

8. The ammunition magazine casing of claim 6 , wherein the magazine casing is made out of polymer.

9. The ammunition casing of claim 6 , wherein the pair of spines extends to a bottom end of the magazine casing.

10. The ammunition casing of claim 6 , wherein the trench is wider than either of the channels.

11. An ammunition magazine casing and follower system comprising:
a parallel set of spines located on an interior rear length of the casing, the set of spines defining channels on either side of each spine, the parallel set of spines along with the interior length of the casing defining a trench between the spines;
a follower configured to interface with the spines while traveling along at least some of the length of the magazine casing such that a space created by the channels between an end portion of the follower and a wall of the casing is larger than any space between both:
the end portion of the follower and the spines and
the end portion of the follower and the wall of the casing that is not part of the channels.

12. The ammunition magazine casing and follower system of claim 11 , wherein
the spines end at a location on the interior of the magazine that is insertable into a magazine well.

13. The ammunition magazine casing and follower system of claim 11 , wherein the parallel set of spines comprises two spines.

14. The ammunition magazine casing and follower system of claim 11 , wherein
the end portion of the follower is configured to nest within at least two of the spines.

15. The ammunition magazine casing and follower system of claim 14 , wherein the follower and the casing are configured to allow the end portion of the follower to nest within at least two of the spines as the follower travels the entire distance of the magazine.

16. The ammunition magazine casing and follower system of claim 11 , wherein the parallel set of spines extends to a bottom end of the magazine casing.

17. The ammunition magazine casing and follower system of claim 11 , wherein an end of the channels at a top end of the magazine creates an internal follower stop.

18. The ammunition magazine casing and follower system of claim 11 , wherein the casing is made of polymer.

19. The ammunition magazine casing and follower system of claim 11 , wherein the trench is wider than each of the channels.

Assignees

• Magpul Ind Corp

Inventors

• Fitzpatrick Richard M
• Mayberry Michael T
• Nakayama Brian L

Classifications

• F41A9/70 Primary

  Arrangements thereon for discharging, e.g. cartridge followers or discharge throats · CPC title

• F41A9/64

  for unbelted ammunition · CPC title

• F41A9/65

  Box magazines having a cartridge follower · CPC title

• F41A9/62

  having means for indicating the number of cartridges left in the magazine, e.g. last-round indicators (last-round safeties F41A17/40) · CPC title