Ammunition magazine
The present invention is an ammunition magazine, preferably made of a reinforced polymer, utilizing a structurally enhancing ridge, angular guide rails and a follower made to interface with said guide rails to reduce wobble. The preferred embodiment also features a protective cover that distributes forces from the spring to more structurally sound areas of the magazine, thus reducing feed end splay, and an ammunition indication system comprised of at least one window and a noticeable marker on the follower spring. The follower and magazine casing are also designed to interface to prevent the follower from popping out of the feed end and the floor plate of the magazine utilizes a locking plate and sliding relationship between the floor plate, locking plate and magazine to secure the floor plate onto the magazine casing. The cover features built in tools for, among other things, unloading and disassembling the magazine.
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The present Application for Patent is a reissue of U.S. patent application Ser. No. 15/661,620 entitled “Ammunition Magazine” filed Jul. 27, 2017 and issued on Sep. 11, 2018 as U.S. Pat. No. 10,072,903, which is a Continuation of U.S. patent application Ser. No. 14/632,804 entitled “Ammunition Magazine” filed Feb. 26, 2015 and issued on Aug. 29, 2017 as U.S. Pat. No. 9,746,264, which is a Continuation of U.S. patent application Ser. No. 14/461,229 entitled “Ammunition Magazine” filed Aug. 15, 2014 and issued on Mar. 31, 2015 as U.S. Pat. No. 8,991,086, which is a Continuation-in-Part of patent application Ser. No. 14/098,467 entitled “Ammunition Magazine” filed Dec. 5, 2013 and issued on Sep. 23, 2014 as U.S. Pat. No. 8,839,543, which is a Continuation of patent application Ser. No. 13/307,431 entitled “Ammunition Magazine” filed Nov. 30, 2011 and issued on Jan. 28, 2014 as U.S. Pat. No. 8,635,796, which is a Continuation of prior filed U.S. application Ser. No. 12/354,766, filed Jan. 15, 2009 and issued on Dec. 6, 2011 as U.S. Pat. No. 8,069,601 which, in turn, is a Continuation-in-Part of prior filed U.S. application Ser. No. 11/958,274, filed on Dec. 17, 2007 issued on Mar. 22, 2011 as U.S. Pat. No. 7,908,780, which, in turn, claims priority to earlier filed U.S. Provisional Application No. 60/941,646, filed on Jun. 1, 2007. Each of these patents and applications are assigned to the assignee hereof and are hereby expressly incorporated by reference herein.
FIELD OF THE DISCLOSUREThe present invention relates to the field of firearms and more particularly relates to an improved ammunition magazine.
BACKGROUNDAmmunition magazines are well known in the art of firearms. Their basic construction is a containment shell with two open ends. One end is deemed the “floor” of the magazine and is covered by a plate while the opposite end is the “feed” end and interfaces with the weapon. Inside the volume defined by the shell and plate is a spring and follower assembly. When ammunition is loaded into the magazine, the ammunition pushes the follower down towards the floor and thereby compresses the spring. In use, when one cartridge of ammunition is expended, the compressed spring releases and pushes the follower and associated ammunition upwards toward the feed end and the next round of ammunition is thereby readied.
Prior magazines have been manufactured in many different configurations and of different materials. Perhaps the best known in the U.S. are the AK-47 and the USGI AR15/M16 magazines. These magazines function similarly, though they are made with slight variations to interface with their host system. Of notable difference is that the AK-47 magazine has a relatively constant curvature while the AR15/M16 magazine has a less curved lower region that gradually resolves to a more linear function towards the feed end. Both use the same type of internal system. Of particular note with both, and all follower magazine systems, is that the system works well only as the follower smoothly and levelly travels the inside of the magazine. As the follower must move, there is room for the follower in all the known prior art magazines to move axially, or “wobble” and possibly jam. This is notorious in the AR15/M16 magazine style as the geometry of the magazine is inherently not uniform.
The present invention is a polymer magazine with angularly shaped guide rails to interface with the internal follower, thereby restricting axial motion of the follower. The magazine also features a load indicator and a two-piece floor plate locking system. The present invention represents a departure from the prior art in that the magazine of the present invention allows for more stable and level motion of the follower while the magazine is loaded or unloaded.
SUMMARY OF THE DISCLOSUREIn view of the foregoing disadvantages inherent in the known types of ammunition magazines, this invention provides an improved magazine. As such, the present invention's general purpose is to provide a new and improved magazine that is backwards compatible with known weapon platforms and presents a more stable follower and follower path.
To accomplish these objectives, the improved ammunition magazine comprises a plurality of lateral angularly shaped guide rails within the magazine shell and a follower that is configured to abut them. By interfacing with more internal structure, all non-advantageous linear and axial motion is inhibited and the follower is then more stable in its progress. The magazine also features a polymer construction and an ammunition load indicator system. The magazine also features a cover for storage.
The more important features of the invention have thus been outlined in order that the more detailed description that follows may be better understood and in order that the present contribution to the art may better be appreciated. Additional features of the invention will be described hereinafter and will form the subject matter of the claims that follow.
Many objects of this invention will appear from the following description and appended claims, reference being made to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.
Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
With reference now to the drawings, the preferred embodiment of the ammunition magazine is herein described. It should be noted that the articles “a”, “an” and “the”, as used in this specification, include plural referents unless the content clearly dictates otherwise.
With reference to
Inside the body 10, along the fore side of the magazine 1, is a ridge 19, shown in
As shown in
At the top of ridge 19 is a slight tab 29 (
In an embodiment, the magazine body is comprised of a reinforced thermoplastic polymer selected to resist damage from use (e.g., the ejection of a magazine which causes the magazine to impact a hard surface, which may occur during a speed reload). However, other polymers may be used and the magazines may be made in any color or opacity (which can reduce or eliminate the need for a magazine level indicator). Some polymers may be used without reinforcement. Various reinforcement materials, such as glass, carbon (e.g., carbon fiber or carbon nanotubes), minerals, or metals (e.g., steel, titanium, aluminum, etc.) may also be used to reinforce the magazine. Likewise, the magazine body may be made of other materials having suitable strength and durability, such as titanium, ceramics, laminates, amorphous metals, etc. The follower is preferred to be made of polyoxymethylene, or acetal resin, available commercially from DuPont under the trade name DELRIN, though other materials are suitable, just not preferred.
The magazine 1 is structured to increase its structural integrity. To that end, fore ridge 19 provides added durability to the magazine. Protective cover 40 also provides reinforcement during storage, as pressures from the stored ammunition and spring 35 would normally force the feed lips 21 of the magazine 1 apart. Protective cover 40, shown in
The cover 40 also serves as a magazine tool as the cover latch 43 will fit between the feed lips 21 so as to push rounds of ammunition 50 out of the magazine 1 (
It should also be noted that magazine body 10 presents a constant internal curve, with slight straightening near the interior rear face of the feed lips only to allow interface with a weapon. As such, the follower 30 and associated ammunition travel more smoothly through the magazine body 10 with lessened round stack variation.
Although the present invention has been described with reference to preferred embodiments, numerous modifications and variations can be made and still the result will come within the scope of the invention. No limitation with respect to the specific embodiments disclosed herein is intended or should be inferred.
Claims
1. An ammunition magazine comprising:
- a casing with fore and aft sides and two longer lateral sides longer than the fore and aft sides and first and second open ends, the casing further comprising a ridge, centrally located on an interior side of the fore side, guide rails running along insides of the longer lateral sides, the casing further comprising a stop tab projecting internally from a front of the casing constant internal curve initiating at or near the second open end and continuing through a majority of the casing of the magazine; and
- a follower residing within the casing, said follower further comprising a follower platform with one to four tines, one of the one to four tines being at a fore position that extends generally perpendicularly from the follower platform, the guide rails contacting the follower to act as a guide for the follower, a groove serving as a detent situated in the follower platform to interface with the stop tab.
2. The ammunition magazine of claim 1, wherein the casing further comprises a constant internal curve initiating initiates at the second open end and continuing through a majority of the casing of the magazine.
3. The ammunition magazine of claim 2, wherein one of the one to four tines is arranged at an aft position of the follower platform that extends generally perpendicularly from the follower platform.
4. The ammunition magazine of claim 2, wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.
5. The ammunition magazine of claim 1, wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.
6. The ammunition magazine of claim 1, wherein one of the one to four tines is arranged at an aft position of the follower platform that extends generally perpendicularly from the follower platform.
7. The ammunition magazine of claim 1 6, wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of another one of the one to four tines presses against the ridge.
8. The ammunition magazine of claim 1, wherein one or more of the one to four tines is split into two regions via a vertical gap arranged at a center of the one or more tines.
9. An ammunition magazine comprising:
- a casing with fore and aft sides and two longer lateral sides longer than the fore and aft sides and first and second open ends, the casing further comprising a ridge, centrally located on an interior side of the fore side, the casing further comprising guide rails running along insides of the longer lateral sides, the casing further comprising a constant internal curve initiating at the second open end and continuing through a majority of the casing of the magazine, and the casing further comprising a stop tab projecting internally from a front of the casing; and
- a follower residing within the casing, said follower further comprising a follower platform with one to four tines, one of the one to four tines being at a fore position that extends generally perpendicularly from the follower platform, another of the one or more tines being at an aft position and shaped to fit into a trough in at least a portion of the aft side, the guide rails contacting the follower to act as a guide for the follower, a groove serving as a detent situated in the follower platform to interface with the stop tab, thereby preventing the follower from eiting the magazine through the first end.
10. The ammunition magazine of claim 9, wherein the follower platform comprises a second tine at an aft position of the follower that extends generally perpendicularly therefrom.
11. The ammunition magazine of claim 10 9, wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.
12. The ammunition magazine of claim 9, wherein the casing further comprises a ridge, centrally located on an interior side of the fore side, wherein a front face of one of the one to four tines presses against the ridge.
13. The ammunition magazine of claim 9, wherein one or more of the one to four tines is split into two regions via a vertical gap arranged at a center of the one or more tines.
14. The ammunition magazine of claim 1, further comprising a stop tab projecting internally from a front of the casing.
15. The ammunition magazine of claim 14, further comprising a groove serving as a detent situated in the follower platform to interface with the stop tab.
16. The ammunition magazine of claim 9, further comprising a groove serving as a detent situated in the follower platform to interface with a stop tab, thereby preventing the follower from exiting the ammunition magazine through the first end.
17. The ammunition magazine of claim 9, wherein the casing further comprises a constant internal curve initiating at the second open end and continuing through a majority of the casing of the ammunition magazine.
18. The ammunition magazine of claim 9, wherein the casing further comprises a stop tab projecting internally from a front of the casing.
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Type: Grant
Filed: Sep 10, 2020
Date of Patent: Jun 14, 2022
Assignee: Magpul Industries Corp. (Austin, TX)
Inventors: Richard M. Fitzpatrick (West Lake Hills, TX), Michael T. Mayberry (Denver, CO), Brian L. Nakayama (Arvada, CO), Eric C. Burt (Broomfield, CO)
Primary Examiner: Jeffrey R Jastrzab
Application Number: 17/017,408
International Classification: F41A 9/65 (20060101); F41A 9/70 (20060101); F41A 9/62 (20060101); F41A 9/67 (20060101); F41A 9/69 (20060101); F41A 9/83 (20060101);