Here is the description of "reconfigurable firearm" from the pdf file above:1. The concept
The idea is based on the difference between bullpup and conventional firearms, which is the positions and the order between the trigger/grip and the feeding port (magazine port, belt tray) of a firearm. This design allows to change this order quickly on the field so customers can reconfigure it as they want.
Currently on the market, people already modify conventional gun to bullpup, e.g. bullpup AK47, M14… It shows that firearm can be reconfigured, but there is no firearm that can be switched back and forth quickly between two configurations until this invention. Because of feature, this new design will be referred as “reconfigurable firearm”.
The following image shows an example:
FIG. 33 shows how a single firearm 3200 can be switched quickly between bullpup (FIG. 33a) and conventional forms (FIG.33b). Firearm 3200 contains barrel 3211 and magazine port 3207, and other internal mechanisms similar to traditional firearms.
The only new components are the collapsible stock 3204, and a detachable trigger/pistol grip 3201 that can be attached in front (FIG.33a) or in the rear (FIG.33b) of feeding port 3207. A simple internal linkage is used to connect the trigger in both positions to the firing mechanism (not shown in the image).
+ When user wants a bullpup gun, the stock 3204 is collapsed, and the trigger/pistol grip 3201 is attached in the front, as shown in FIG. 33a. The linkage will connect the trigger to the firing mechanism in the back.
+ When user wants a conventional gun, the stock 3204 is extended, and the trigger/pistol grip 3201 is attached in the rear, as shown in FIG. 33b. A screw 3217 or other mechanism is used to fix the pistol grip to the receiver.
The design in FIG. 33 is very simple: using only a collapsible stock, a detachable trigger and an internal linkage, but it allows firearm to be reconfigurable on the field, and solves the issue between bullpup versus conventional firearms. 2. Other solutions
All designs to quickly change configurations of a firearm, are summed in the image below:
FIG. 2 illustrates 4 methods to switch quickly between bullpup and conventional forms.
To change the order between the trigger and feeding port, there are 2 approaches: one component is fixed while the other is relocated. To design around, 2 fixed redundant components can be used instead the relocated component, so there are 4 methods, and all of them is shown in FIG. 2.
FIG. 2a shows firearm 201 with two feeding ports 211 and 213, and trigger 212. If user wants to use firearm 201 as conventional gun, user will load magazine into front feeding port 211, and if user want to use it as a bullpup gun, user will load magazine into rear feeding port 213.
The barrel and firing mechanism can be repositioned to the corresponding feeding port in use, e.g. by attaching them to the upper receiver, and then reposition the upper receiver.
FIG. 2b shows a slightly different version of FIG. 2a. Instead of using two feeding ports, the firearm 202 contains a detachable feeding port 221, which can be attached in the front or in the back of trigger 222, depends on user.
FIG. 2c shows firearm 203 with two triggers 231 and 232, and feeding port 233. The gun 203 also contains a collapsible stock 234. When user wants to use the firearm 203 as conventional gun, user uses trigger 232, and extends the stock 234, as shown in FIG. 2c. When user wants a bullpup gun, user uses trigger 231, and collapse stock 234.
FIG. 2d shows a slightly different version of FIG. 2a. Instead of using two triggers, firearm 204 contains a detachable trigger 241 that can be attached in the front or in the back of the feeding port 242.
FIG. 2 shows all possible approaches. To change the order between magazine port and trigger, one of them needs to be repositioned, as 4 designs above. There is no other solutions, these variants already cover all potential designs, which allows exclusive right on the market.
FIG. 3 shows more details about firearm with two feeding ports (FIG. 2a).
FIG. 3a, 3b, 3c show firearm 310 with barrel 311, front feeding port 312, rear feeding port 314, trigger 313, cartridge pusher 315, support 316, cartridge lifter 317, bolt 319.
FIG. 3b shows the gun 310 when used as bullpup firearm. Magazine 3111 is attached to rear feeding port 314.
FIG. 3c shows gun 310 when used as conventional firearm. Magazine 3111 is now attached to front feeding port 312. The cartridge 3112 is pushed backward by cartridge pusher 315 through support 316, to cartridge pusher 317. The whole mechanism works similar to rifles with tubular magazine, but it allows box magazine to be used, which makes firearm more familiar and the reloading is much easier than tubular magazine.
FIG. 3d, 3e, 3f show another version with two feeding ports. FIG. 3d shows gun 320 with barrel 321, front feeding port 322, rear feeding port 324, trigger 323. FIG. 3e shows gun 320 when used as bullpup gun, wherein magazine 325 is loaded into rear feeding port 324. Barrel 321 is fixed in the back, as shown in FIG. 3d and 3e. FIG. 3f shows when gun 320 is used as a conventional firearm, wherein magazine 325 is loaded into front feeding port 322.
Unlike gun 310, there is no mechanism to push cartridge backward, but the barrel 321 and firing mechanism 328 are moved to match the position of front feeding port 322. This can be done by detaching those components from old locations and then attaching them to new locations. Another way is attaching all those components to the upper receiver, and attaches the upper receiver to the lower receiver at different locations.
FIG. 36 shows a firearm with detachable feeding port. Firearm 3610 in FIG. 36a, 36b contains lower receiver 3611 and upper receiver 3612. The upper receiver 3612 houses barrel 3613 and firing mechanism, while lower receiver 3611 contains trigger, pistol grip and a detachable feeding port 3614.
In FIG. 36a, firearm 3610 is configured as a bullpup, the feeding port 3614 and upper receiver 3612 are attached in the rear of trigger. To reconfigure it to conventional firearm, the upper receiver 3612 and feeding port 3614 are detached, and repositioned to the front, as shown in FIG. 36b.
FIG. 36c, 36d show similar version of firearm 3610. The barrel 3623 and firing mechanism are attached to internal receiver 3622. The upper receiver 3625 can now be fixed to lower receiver 3621, which allows sighting device 3626 and optical sight 3627 to work in both configurations.
FIG. 7 shows firearms with two triggers.
FIG. 7a, 7b illustrate gun 710 with two triggers 711, 712, feeding port 713, extendable stock 714, two pistol grips 715, 716. Trigger 711 is in front of feeding port 713 while trigger 712 is in the back of feeding port 713. Magazine 717 is loaded into feeding port 713. Both triggers are connect together by linkage 718, and is connected to firing mechanism (not shown).
FIG. 7a illustrates the gun when used as conventional gun, with stock 714 extended. Pistol grip 716 and trigger 712 are used to handle and fire the gun 710. FIG. 7b illustrates the gun when used as bullpup, pistol grip 715 and trigger 711 are used to control the gun 710.
FIG. 7c, 7d illustrate firearm 720, similar to firearm 710. FIG. 7c shows gun 720 in bullpup form, as trigger 722 and pistol grip 726 are folded into collapsed stock 724, while trigger 721 and pistol grip 725 are used to handle the gun.
FIG. 7d shows gun 720 in convention form, the stock 724 is extended, trigger 721 and pistol grip 725 are folded to clear space, which may be used for other attachment, e.g. a grenade launcher. In this form, trigger 722 and pistol grip 726 are used to handle the gun 720.
FIG. 7e, 7f illustrate firearm 730, similar to firearm 710, but it uses a detachable trigger 732 instead of two triggers 711, 712. Firearm 720 is used in conventional gun in FIG. 7e, stock 734 is extended, trigger 732 and pistol grip 734 are attached to the rear. In FIG. 7f, to switch to bullpup form, stock 734 is collapsed, trigger 732 and pistol grip 734 are reattached in the front.
FIG. 10 illustrates details of firearm 1000 with detachable trigger 1001 and pistol grip 1003, they can be attached in front or in the rear of magazine port 1002. The linkage 1005 is used to connect trigger 1001 to firing mechanism in the back. The stock 1010 can be collapsed or extended to match the form of firearm 1000.
FIG. 10 shows that it only needs a detachable trigger and a linkage to reconfigure a gun between bullpup and conventional form. The method can be implemented in new design or used to modify old firearms (e.g. people often mod bullpup M14 or AK47). It is very simple and low cost.
FIG. 12 illustrates firearm 1000, is switched from bullpup in FIG. 12a to conventional firearm in FIG. 12d. Pistol grip 1003 is detachable, and can be slide back and forth along rail 1015. The stock can be collapsed in FIG. 12a, 12b or extended in FIG. 12c, 12d.
The designs above are just conceptual. Actual design can be made differently for different purposes, e.g. with better aesthetic looking or using simpler mechanisms. For business opportunities, please see the business analysis file. For more details, explanation or information, please contact me the inventor.