Patent Application
20180292153
This invention relates generally to magazines for use with firearms, and more particularly to magazines that are fixed to a firearm such that the magazine is not removable from the firearm.
Firearm laws have been passed in states such as California and New York which require that certain rifles and pistols must be modified to remain legal. In particular, semi-automatic firearms, such as AR-15 rifles and pistols, are being subject to more restrictions, including a prohibition against “detachable magazines”. Instead, the California law, for example, requires a “fixed magazine, where “fixed magazine” means an ammunition feeding device contained in, or permanently attached to, a firearm in such a manner that the device cannot be removed without disassembly of the firearm action. Standard semi-automatic firearms have typically been made and sold for use with detachable magazines. In response to the restrictions of the newer firearms laws, semiautomatic firearms are being made and sold with fixed magazines. Further, conversion kits are being sold to convert a firearm with a detachable magazine to a firearm with a fixed magazine. For example, Hager U.S. Pat. No. 5,806,224 teaches a semi-automatic firearm with a non-removable magazine. Also, Stone U.S. Pat. No. 7,941,955 B2 teaches a pivoting, non-detachable magazine. Further, Harris et al. U.S. Pat. No. 8,756,845 B2 teaches method and device for converting a firearm with detachable magazine to a firearm with a fixed magazine.
By providing a fixed magazine according to the new firearms laws of many states, citizens of those states will be able to legally own a firearm, such as an AR-15.
The fixed magazine of the invention satisfies the new firearms laws, while also being loadable in a way that does not violate the law.
The fixed magazine of the invention is a plastic or metal magazine for centerfire rifles which can be fixed into position so as to become a non-removable magazine, yet it can open while attached to the rifle for easy loading of cartridges.
The method of attachment of the fixed magazine will vary in accordance with the different makes and models of each rifle. The end result of the fixing of the magazine will be compliance with state or local laws, while also facilitating loading of the magazine in a convenient manner.
The fixed magazine of the invention allows a user to easily load the fixed magazine with ammunition without removing the magazine from the firearm, disassembling the action, or using tools. (If this is not legal in your state, a fixed magazine will be provided that requires a tool to open it to load ammunition, but it will open in the same manner as a fixed magazine that does not require a tool.)
A general aspect of the invention is an ammunition magazine for use with a firearm with an upper receiver and a lower receiver, the lower receiver having a magazine well for receiving the ammunition magazine. The ammunition magazine includes: an extension portion configured to contain a stack of cartridges, the extension portion having a loading end and a feeding end, the extension portion including an attachable blocking tab at the feeding end for blocking removal of the ammunition magazine from the magazine well, the attachable blocking tab being attached after insertion of the ammunition magazine into the magazine well, and before re-engaging the upper receiver with the lower receiver; a cartridge-loading portion configured to accept a sequence of cartridges for loading into the extension portion, the cartridge-loading portion including: an opening, and a cover configured to alternately cover or reveal the opening; a follower compartment including: a finger-pull slot with a bottom hook; and a follower assembly having: a follower, a finger-pull, attached to the follower, the finger-pull extending through the finger-pull slot, the finger-pull being movable when released from the bottom hook, and a spring configured to be compressed by the follower when the finger-pull is engaged with the bottom hook, and configured to expand when the finger-pull is disengaged from the bottom hook, thereby allowing the follower to urge the stack of cartridges towards the feeding end of the ammunition magazine.
In some embodiments, the extension portion is configured to limit capacity of the ammunition magazine to no more than ten cartridges.
In some embodiments, the follower assembly includes: a spring guide, configured to provide support and stability for the spring and to provide alignment for the spring when in an extended position and when in a compressed position, the spring guide having a shape that fits inside the follower when the spring is in the compressed position; and a follower arm, fixedly attached to the finger-pull, with the follower arm also configured to flexibly attach to the follower, so as to allow movement of the finger-pull into the bottom hook.
In some embodiments, the cover has a pair of cover grooves, the pair of cover grooves being configured to be slidably supported by a pair of slide rails on the follower compartment.
In some embodiments, the cover has a raised cover stop ridge, that in cooperation with a cover stop groove in the follower compartment prevents the cover from moving beyond the cartridge-loading portion opening.
In some embodiments, the follower compartment has a magazine bottom cap which supports and protects the follower assembly.
In some embodiments, the extension portion, the cartridge-loading portion, the follower compartment, and the follower assembly are each made from at least one of: metal or plastic.
The invention will be more fully understood from the following detailed description, in conjunction with the following figures, wherein:
This view shows that at the top of an ammunition magazine 100 is a follower top plate 112 which supports a stack of cartridges. On the upper side of an extension portion 102 is a magazine insertion grip 116 which snaps into a corresponding shape in the lower receiver when the ammunition magazine 100 is inserted into the lower receiver.
The cartridge-loading portion has a cover 104 which can be moved up or down along an at least one side rail 106. In this view, the cover 104 is in the up and closed position. The extent to which the cover 104 can be moved downward is limited by a cover stop groove 108.
At the bottom of the follower assembly is a magazine bottom cap 110 which forms the structural bottom of the follower assembly.
This view shows one end of a cover 104 which can be moved up or down along an at least one side rail 106. The cover 104 is in the up and closed position.
Also shown is a finger-pull slot 206 along the side of the follower assembly. The finger-pull slot 206 guides the travel of a finger-pull 204 which controls the position of the follower top plate 112. In this view, the finger-pull 204 is in the topmost position within the finger-pull slot 206.
At the bottom of the follower assembly is a magazine bottom cap 110 which forms the structural bottom of the follower assembly.
This view shows a cover 104 in the down position on at least one side rail 106. The cover 104 is in an open position, showing the insertion of a stack of cartridges 302. At the bottom of the follower assembly is a magazine bottom cap 110 which forms the structural bottom of the follower assembly.
This view shows one end of a cover 104 which can be moved up or down along an at least one side rail 106. The cover 104 is in the down and open position. Also shown is a finger-pull slot 206 along the side of the follower compartment. The finger-pull slot 206 guides the travel of a finger-pull 204. In this view, the finger-pull 204 is in the bottom hook 402 within the finger-pull slot 206.
At the bottom of the follower assembly is a magazine bottom cap 110 which forms the structural bottom of the follower assembly.
To allow the finger-pull 204 to change in position into the finger-pull slot's bottom hook, a follower arm T-mount 506 provides flexible attachment points for the top of the follower arm 504. In addition, the follower arm flexible stem 512 is thin and flexible so that the finger-pull 204 can move flexibly within the finger-pull slot's bottom hook.
A follower assembly 500 includes a spring 508 to push up the follower 502, and thereby securely push the stack of cartridges up inside the magazine cavity. A spring guide 510 is configured to provide support for a spring lower end 514 and to provide alignment for the spring 508 when in an extended position and when in a compressed position, with the spring guide 510 having a shape that fits inside the follower 502 when the spring 508 is in the compressed position;
A magazine bottom cap 110 supports the spring guide 510, in addition to forming the structural bottom of the follower assembly.
A follower assembly 500 includes a spring 508. A spring upper end 602 is configured to push up the follower 502, and thereby securely push the stack of cartridges up inside the magazine cavity. A spring guide 510 is configured to provide support for a spring lower end 514 and to provide alignment for the spring 508 when in an extended position and when in a compressed position, with the spring guide 510 having a shape that fits inside the follower 502 when the spring 508 is in the compressed position; A magazine bottom cap 110 supports the spring guide 510, in addition to forming the structural bottom of the follower assembly.
To allow the finger-pull 204 to change in position into the finger-pull slot's bottom hook, the follower 502 includes a follower arm T-mount 506 which provides flexible attachment points for the top of the follower arm 504. In addition, a follower arm flexible stem 512 is thin and flexible so that the finger-pull 204 can move flexibly within the finger-pull slot's bottom hook.
A movable finger-pull cutout 702 provides and open cutout to allow the follower arm 504 to move horizontally, and to allow the finger-pull 204 to move flexibly within the finger-pull slot's bottom hook.
In this embodiment, also shown are a pair of cover grooves 802 which fit over a pair of side rails that are on the pair of magazine side ends, and which slidably support the cover 104.
Installing the Fixed Magazine
To install the fixed magazine on the firearm, the upper receiver is first separated from the lower receiver. Once the top of the lower receiver is exposed, the fixed magazine of the invention is inserted up into the magazine well.
In one embodiment of the invention, a blocking tab is then placed over the top of the fixed magazine such that the blocking tab overlaps a portion of the upper side of the lower receiver. The blocking tab is then attached to the fixed magazine using a screw which fixes the tab to both the lower receiver and the fixed magazine, so that the fixed magazine cannot be removed from the firearm without separating the upper receiver and the lower receiver.
Loading the Magazine
Because the magazine is fixed to the firearm, the magazine cannot be loaded from the top of the fixed magazine. Instead, a side-loading method is used. A sliding cover located on one side of the magazine is opened to allow the magazine to be side-loaded with cartridges.
In addition, to load the magazine, one uses a finger-pull located in a slot on one side of the magazine to retract the spring-loaded cartridge follower. Having the finger-pull on one side of the magazine allows one to conveniently grip the other side of the magazine with one's other hand while retracting the cartridge follower.
During the loading process, the finger-pull is pulled down along a slot in the side of the magazine. The finger-pull is locked in the down position by moving the finger-pull into a bottom hook, located at the bottom of the finger-pull slot. When the finger-pull is in the down and hooked position, the magazine spring is compressed, and the cartridge follower is locked in the down position.
The cover on the side of the magazine is then opened by sliding the cover down, which reveals the cartridge opening. This also reveals the cartridge cavity in the upper part of the magazine, providing space for loading the stack of ammunition cartridges. Once this cavity is opened, the user can easily load ammunition cartridges into the cavity in the upper extension portion of the magazine.
Once the stack of cartridges is loaded, the cover is closed by sliding it upwards, and the finger-pull is unhooked from the bottom hook. Once the finger-pull is released from the bottom hook, the cartridge follower pushes up against the stack of cartridges, allowing the magazine and the firearm to work normally.
Other modifications and implementations will occur to those skilled in the art without departing from the spirit and the scope of the invention as claimed. Accordingly, the above description is not intended to limit the invention, except as indicated in the following claims.
This application claims priority to three provisional patent applications, i.e., Application No. 62/483,814, Filed Apr. 10, 2017, entitled “Fixed Firearms Magazine Loadable Via a Downward-Sliding Wall”; Application No. 62/483,822, Filed Apr. 10, 2017, entitled “Fixed Firearms Magazine Loadable Via a Downward-Sliding Sleeve”; and Application No. 62/483,827, Filed Apr. 10, 2017, entitled “Fixed Firearms Magazine Loadable Via a Hinged-Door”, the entire contents of each being herein incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| 62483814 | Apr 2017 | US | |
| 62483822 | Apr 2017 | US | |
| 62483827 | Apr 2017 | US |
