DOUBLE-BARREL PUMP SHOTGUNS
An improved shotgun design that includes at least two barrels, a trigger assembly that allows for individual simultaneous firing of each barrel, a single magazine with parallel ammunition wells that each feed one barrel, and a single slide mechanism that actuates the loading/unloading mechanism and resets the firing mechanism for discharge of subsequent rounds.
This application claims priority to provisional U.S. Application, Ser. No. 61/893,012, filed on Oct. 18, 2013, which is hereby incorporated by reference for all purposes.
BACKGROUNDThe present disclosure relates generally to shotguns. In particular, double-barrel pump shotguns are described.
The Second Amendment to the United States Constitution guarantees American Citizens the right to bear arms. Firearms are a ubiquitous component of American culture and are used for many purposes, including hunting, recreational target shooting, home defense, and personal defense. Common types of firearms include handguns, rifles, assault rifles, and shotguns. Shotguns serve particularly vital peace keeping and defensive roles in law enforcement and military applications.
Known shotguns are not entirely satisfactory for the range of applications in which they are employed. For example, existing shotguns offer limited ammunition capacity. Conventional shotguns are often limited to single round or double round capacities. Further, spent shell casings must be removed from a shotgun barrel prior to loading and firing subsequent rounds.
In addition, although some conventional shotguns allow multi-round capacities, conventional shotguns are limited by maximum round capacity. Conventional multi-round capacities range from 2 rounds in a breach-load double-barrel shotgun to 32 rounds in a drum magazine shotgun. Drum magazines are often undesirable because the drum configuration is large and bulky.
Typically, rounds in a handgun magazine or high-powered rifle magazine are stacked in a staggered configuration. In other words, two columns of rounds are stacked side-by-side inside the magazine. Staggering the rounds in a staggered magazine essentially doubles the capacity of a linear stack magazine of identical dimension. Handgun and rifle rounds incorporate pointed or rounded tips that allow the round to exit the staggered magazine at an angle and to self-guide into the gun barrel.
Unlike handgun and rifle rounds that incorporate round or pointed tips, shotgun rounds are flat on the tip. Existing shotgun magazines have failed to incorporate a staggered configuration for existing shotgun rounds, primarily because the flat-tipped shotgun rounds cannot self-guide into the gun barrel. Thus, when flat-tipped shotgun rounds are pushed out of a staggered magazine, the flat-tipped rounds jam in the firing port causing the shotgun to malfunction.
Therefore, maximum round capacities of existing shotguns are limited by existing magazine configurations. Further, total capacities of existing magazine configurations are limited due to weight distribution and dimension limitations. Existing shotgun magazine configurations include under-barrel tubes, single-stack magazines, and drum magazines.
Conventional under-barrel tubes cannot extend past the shotgun barrel to which they are mated. Under-barrel tubes must not protrude past the exit port of the shotgun barrel because a protruding under-barrel tube would interfere with the trajectory of a round fired from the barrel. A longer under-barrel tube capable of holding more rounds would be awkward to maneuver and would inhibit the accuracy of the shotgun. Currently, a maximum round capacity of 4-16 rounds is feasible with conventional under-barrel tubes.
Additionally, existing single-stack magazines capacities are limited by length. Existing single-stack magazines mount beneath or above the shotgun barrel and are linear. In other words, rounds of ammunition are stacked directly above or below additional rounds and fed into the firing chamber in a linear fashion. The length of existing single-stack magazines must be limited to maintain balance and maneuverability with existing shotguns. A maximum round capacity of 10 rounds is feasible with existing single-stack magazines.
Moreover, conventional drum magazines are large, awkward, and fragile. Live rounds are configured in a coil inside conventional drum magazines. A traditional coil of live rounds feeds into the shotgun barrel through a firing chamber port. The coiled rounds require a large drum size to accommodate multiple rounds. Drum magazines are fragile and malfunction-prone. A maximum round capacity of 32 rounds is feasible with existing drum magazines. Although conventional drum magazines offer larger capacities, drum magazines are flawed due to the large size and unwieldy nature of the awkward drum.
Thus, there exists a need for shotguns that improve upon and advance the design of known shotguns. Particularly, there exists a need for double-barrel pump shotguns that incorporate side-by-side, staggered-stack magazines with large multi-round capacities. Examples of new and useful double-barrel pump shotguns relevant to the needs existing in the field are discussed below.
SUMMARYThe present disclosure is directed to an improved shotgun design. The improved shotgun includes at least two barrels, a trigger assembly that allows for individual or simultaneous firing of each barrel, a single magazine with parallel ammunition wells that each feed one barrel, and a single slide mechanism that actuates the loading/unloading mechanism and resets the firing mechanism for discharge of subsequent rounds.
The disclosed double-barrel pump shotguns will become better understood through review of the following detailed description in conjunction with the figures. The detailed description and figures provide merely examples of the various inventions described herein. Those skilled in the art will understand that the disclosed examples may be varied, modified, and altered without departing from the scope of the inventions described herein. Many variations are contemplated for different applications and design considerations; however, for the sake of brevity, each and every contemplated variation is not individually described in the following detailed description.
Throughout the following detailed description, a variety of double-barrel pump shotgun examples are provided. Related features in the examples may be identical, similar, or dissimilar in different examples. For the sake of brevity, related features will not be redundantly explained in each example. Instead, the use of related feature names will cue the reader that the feature with a related feature name may be similar to the related feature in an example explained previously. Features specific to a given example will be described in that particular example. The reader should understand that a given feature need not be the same or similar to the specific portrayal of a related feature in any given figure or example.
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Double-barrel pump shotgun 100 addresses many of the shortcomings existing with conventional shotguns. For example, double-barrel pump shotgun 100 incorporates a staggered-stack, side-by-side magazine with a 50-round capacity. Moreover, shotgun 100 facilitates or allows feeding flat-tipped shotgun rounds from a staggered magazine and eliminates the shortcomings of conventional shotguns.
By incorporating the staggered-stack, side-by-side magazine, shotgun 100 eliminates the magazine shortcomings of existing shotguns. The magazine of shotgun 100 mounts directly under the center of the receiver and eliminates any protrusion risk presented by conventional linear tube magazines. It offers significantly better capacity than a tubular magazine mounted underneath the barrel, which cannot exceed the barrel length, and cannot be removed to allow for quick swapping with a second, preloaded magazine. It offers a shorter length (in exchange for a slightly wider profile) compared with existing non-staggered linear magazines. Finally, compared to existing drum magazine designs, it offers greater mechanical robustness, resistance to adverse handling conditions, and a substantially slimmer profile.
Moreover, the stack configuration of the new magazine ensures shotgun 100 is balanced and stable. Placing the magazine in the center of the receiver just in front of the trigger and grip facilitates or allows carrying and maneuvering shotgun 100 conveniently and easily. Additionally, centering the magazine between the grip and fore-grip distributes the weight of double-barrel pump shotgun 100 and eliminates trigger arm fatigue.
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Lower receiver 112 comprises the lower half of shotgun 100. Lower receiver 112 is complimentarily configured with upper receiver 110 and cooperatively houses the internal mechanics of double-barrel pump shotgun 100. In the
Upper receiver 110 and lower receiver 112 together combine to form the primary housing of shotgun 100. Into this combined primary housing are inserted the first barrel 150, second barrel 155, magazine 130, a trigger assembly comprised of trigger 120, first gear 121, second gear 122, first sprocket 123, second sprocket 124, grip 125, first chain 127, and second chain 128, first bolt 143, and second bolt 144, and bolt stop 176. Butt stock 180 is attached to the outside of the combined primary housing, along with rear sight mount 170 and plate 175. Operating rods 140 protrude into the combined primary housing and attach to the first bolt 143 and second bolt 144 to enable actuation of the bolts, comprising the action of the shotgun 100. The workings of the action will be described further below.
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Shotgun 100 can be reassembled by reversing the foregoing steps. In the example shown in
For triggers 120 implemented as two adjacent halves capable of firing each barrel independently, the foregoing trigger and tire control mechanism is duplicated in mirrored fashion for a second bolt 144 and barrel. In particular slide bar 310, rear shaft 320, and front shaft 330 (shown in
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In the example embodiment, magazine 500 ideally has a maximum capacity of 50 rounds. Alternatively, the magazine may be configured to hold fewer or more rounds. Essentially, the overall length and total weight of the fully loaded magazine will be limiting factors when determining the maximum capacity of the magazine. The components of magazine 510 are ideally made of a material that is lightweight yet strong, such as aluminum, plastic, Nylon 66, Zytel®, a composite, or any other suitable material capable of securely and rigidly holding the weight of ammunition contained therein.
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Many of the above components of double-barrel pump shotgun 100 are identical on opposite sides. In other words, many components on one-half of double-barrel pump shotgun 100 are a mirror image of the same components on the other one-half. It is also contemplated that single components of the double-barrel pump shotgun may be utilized to comprise a single-barrel pump shotgun. Indeed, a single staggered-stack magazine with 25-round capacity may be combined with other components listed above to comprise a robust, single-barrel pump shotgun with firepower and balance superior to existing pump shotguns.
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Next, the fore-grip 135 is moved back away from lower receiver 112 towards its forward stop. This in turn causes the operating rods 140 to pull first bolt 143 and second bolt 144 back towards the breach of each associated barrel. First bolt 143 and second bolt 144 simultaneously strip new, live rounds out of magazine 130 into first barrel 150 and second barrel 155, respectively. As the new rounds slide forward, they are pushed up by a combination of the magazine followers 540 and associated springs 550, and the tapered shape of the lower receiver 112. The rounds come into contact with their respective bolts' extractor plate 410 and the control rod opposing the extractor plate 410, which in combination serve to center the new rounds in line with the axis of each bolt's respective barrel, thereby ensuring smooth and accurate feeding of the new round. As fore-grip 135 is returned to the first position, first bolt 143 and second bolt 144 simultaneously complete loading the live rounds into first barrel 150 and second barrel 155, and cock the firing mechanism in each bolt. Following making contact with breaches of their respective barrels, final forward travel of the fore-grip 135 actuates the cam inside each bolt, which causes each bolt's respective locking pin to raise, thereby securing the bolts from rearward movement and making the shotgun 100 ready to fire.
A user may discharge the shotgun 100 by electing to pull one half of trigger 120 initially then the other half of trigger 120 subsequently, or both halves of trigger 120 simultaneously. Pulling trigger 120 fires rounds from first barrel 150 and second barrel 155. Following firing, cycling of fore-grip 135 as described in the foregoing repeats the above extraction, ejection, and loading cycle, rendering double-barrel pump shotgun 100 again capable of firing two new live rounds. This cycle may be repeated sequentially until all rounds in the magazine have been fired.
The disclosure above encompasses multiple distinct inventions with independent utility. While each of these inventions has been disclosed in a particular form, the specific embodiments disclosed and illustrated above are not to be considered in a limiting sense as numerous variations are possible. The subject matter of the inventions includes all novel and non-obvious combinations and subcombinations of the various elements, features, functions and/or properties disclosed above and inherent to those skilled in the art pertaining to such inventions. Where the disclosure or subsequently filed claims recite “a” element, “a first” element, or any such equivalent term, the disclosure or claims should be understood to incorporate one or more such elements, neither requiring nor excluding two or more such elements.
Applicant(s) reserves the right to submit claims directed to combinations and subcombinations of the disclosed inventions that are believed to be novel and non-obvious. Inventions embodied in other combinations and subcombinations of features, functions, elements and/or properties may be claimed through amendment of those claims or presentation of new claims in the present application or in a related application. Such amended or new claims, whether they are directed to the same invention or a different invention and whether they are different, broader, narrower or equal in scope to the original claims, are to be considered within the subject matter of the inventions described herein.
Claims
1. A shotgun, comprising:
- a plurality of barrels;
- a plurality of bolts, where each one of said bolts is associated with one of said plurality of barrels; and each one of said bolts possesses a firing mechanism;
- a slide that is operably connected to said plurality of bolts so as to enable cycling of all of said plurality of bolts simultaneously;
- a magazine comprising a plurality of ammunition wells, where each one of said plurality of ammunition wells is associated with one of said plurality of barrels; and each one of said plurality of ammunition wells is positioned so as to allow feeding of ammunition inserted therein into its associated barrel by the bolt associated with the associated barrel; and
- a plurality of triggers configured so that each one of said triggers is associated with one of said plurality of bolts; and each one of said triggers can be independently actuated so as to release the firing pin of its associated bolt.
2. The shotgun of claim 1, further comprising a receiver wherein said receiver houses the plurality of bolts, and into which the plurality of barrels and plurality of magazines are inserted.
3. The shotgun of claim 2, wherein
- each of said barrels possesses a breach end capable of receiving a round of ammunition that is inserted into said receiver;
- each of said plurality of bolts possesses a face that contacts the base of said round of ammunition to be chambered, said face having two protrusions disposed on opposite sides of the face so as to align said shell with said breach end of said barrel; and
- said receiver further comprises an upper receiver portion and a lower receiver portion, where said upper and lower receiver portions have tapered inner surfaces proximate to the end of said plurality of barrels that is inserted into said receiver.
4. The shotgun of claim 1, wherein said plurality of triggers are physically arranged so that all of said triggers can be actuated simultaneously.
5. The shotgun of claim 1, wherein each of said plurality of triggers is operably connected to its associated bolt through a chain drive.
6. The shotgun of claim 1, wherein said magazine ammunition wells store inserted rounds of ammunition in a stacked configuration.
7. The shotgun of claim 6, wherein said magazine ammunition wells further store inserted rounds of ammunition in a staggered configuration.
8. The shotgun of claim of claim 1, further comprising a grip attached to said slide to facilitate operating said slide.
9. A shotgun, comprising:
- a shoulder stock;
- two barrels, each capable of receiving a round of ammunition;
- two bolts, each one of said two bolts paired to one of said two barrels and positioned so as to hold said round of ammunition into the end of said barrel, and possessing a firing mechanism for discharging said round of ammunition;
- a magazine capable of holding a plurality of rounds of ammunition;
- a foregrip disposed below said two barrels so as to slide axially relative to said barrels;
- one or more pushrods connected to said foregrip and said bolts, and positioned so as to move said bolts in response to sliding said foregrip, said movement allowing said bolt to insert and remove said round of ammunition into said barrel; and
- a housing wherein said shoulder stock is attached; said two bolts are enclosed and positioned so as to facilitate loading and unloading of said plurality of rounds of ammunition into the ends of said two barrels in response to sliding said foregrip; said barrels are inserted so as to allow said two bolts to load and unload said rounds of ammunition into the ends of said two barrels; and said magazine is inserted so as to hold said rounds of ammunition held therein between said two bolts and two barrels in a position that allows said bolts to transfer said rounds of ammunition into the ends of said two barrels.
10. The shotgun of claim 9, further comprising a trigger mechanically linked to each of said two bolts so as to cause said firing mechanism in each of said two bolts to discharge said rounds of ammunition simultaneously.
11. The shotgun of claim 10, wherein said mechanical link is comprised of a chain and at least two sprockets.
12. The shotgun of claim 9, further comprising two triggers, each of said two triggers mechanically linked to one each of said two bolts so as to cause said firing mechanism in said linked bolt to discharge its associated round of ammunition.
13. The shotgun of claim 12, wherein said two triggers are arranged so as to facilitate actuating both triggers simultaneously.
14. The shotgun of claim 13, wherein said mechanical linkages are comprised of a plurality of chains and sprockets.
15. The shotgun of claim 9, wherein
- each of said two bolts possesses an extractor positioned opposite to said pushrod, said extractor and pushrod arranged so as to center a round of ammunition to be loaded into the barrel associated with said bolt along the center axis of said barrel; and
- said housing further comprises an upper receiver and a lower receiver, with each of said upper receiver and lower receiver having a tapered inner surface proximate to the end of said barrels that are inserted into said housing, said tapered inner surfaces positioned so as to guide a round of ammunition to be loaded into either of said barrels along the center axis of said barrel.
16. The shotgun of claim 9, wherein said magazine possesses a partition that divides said magazine into two ammunition wells, with each of said ammunition wells associated with one of said two barrels.
17. The shotgun of claim 16, wherein each of said ammunition wells holds said rounds of ammunition in a stacked configuration.
18. The shotgun of claim 17, wherein each of said ammunition wells holds said rounds of ammunition in a staggered stacked configuration.
19. The shotgun of claim 9, further comprising a trigger mechanically linked to each of said two bolts so as to cause said firing mechanism in each of said two bolts to discharge said rounds of ammunition sequentially, with one round discharged for each actuation of said trigger.
20. A shotgun, comprising:
- an adjustable shoulder stock;
- two barrels, each capable of receiving a round of ammunition;
- two bolts, each one of said two bolts paired to one of said two barrels and positioned so as to hold said round of ammunition into the end of said barrel, possessing a firing mechanism for discharging said round of ammunition, and two oppositely disposed protrusions arranged so as to align said round of ammunition with the center axis of said barrel;
- a magazine with two independent wells, each associated with one of the said two barrels and capable of holding a plurality of rounds of ammunition;
- a foregrip disposed below said two barrels so as to slide axially relative to said barrels;
- one or more pushrods connected to said foregrip and said bolts, and positioned so as to move said bolts in response to sliding said foregrip, said movement allowing said bolt to insert and remove said round of ammunition into said barrel; and
- a housing comprised of an upper and lower receiver, wherein said shoulder stock is attached; said two bolts are enclosed and positioned so as to facilitate loading and unloading of said plurality of rounds of ammunition into the ends of said two barrels in response to sliding said foregrip; said barrels are inserted so as to allow said two bolts to load and unload said rounds of ammunition into the ends of said two barrels; said upper and lower receiver have inner surfaces that are tapered towards the portion of said two barrels that is inserted into said housing so as to align a round of ammunition inserted into either of said two barrels with the center axis of said barrel; and said magazine is inserted so as to hold said rounds of ammunition held therein between said two bolts and two barrels in a position that allows said bolts to transfer said rounds of ammunition into the ends of said two barrels; and
- two latch levers disposed to enable disassembly of the shotgun.
Type: Application
Filed: Oct 20, 2014
Publication Date: Oct 22, 2015
Inventor: Jerry Carson (Beaverton, OR)
Application Number: 14/518,202