US20200124388A1 - Method of achieving controlled, variable ballistic dispersion in automatic weapons - Google Patents
Method of achieving controlled, variable ballistic dispersion in automatic weapons Download PDFInfo
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- US20200124388A1 US20200124388A1 US16/660,327 US201916660327A US2020124388A1 US 20200124388 A1 US20200124388 A1 US 20200124388A1 US 201916660327 A US201916660327 A US 201916660327A US 2020124388 A1 US2020124388 A1 US 2020124388A1
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- Prior art keywords
- ammunition cartridges
- different
- ammunition
- adhesive
- predetermined pull
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B33/00—Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor
- F42B33/001—Devices or processes for assembling ammunition, cartridges or cartridge elements from parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B30/00—Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
- F42B30/02—Bullets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
- F42B5/02—Cartridges, i.e. cases with charge and missile
- F42B5/067—Mounting or locking missiles in cartridge cases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
- F42B5/26—Cartridge cases
- F42B5/28—Cartridge cases of metal, i.e. the cartridge-case tube is of metal
- F42B5/285—Cartridge cases of metal, i.e. the cartridge-case tube is of metal formed by assembling several elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A27/00—Gun mountings permitting traversing or elevating movement, e.g. gun carriages
- F41A27/04—Scatter-fire arrangements, i.e. means for oscillating guns automatically during firing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
- F42B5/02—Cartridges, i.e. cases with charge and missile
- F42B5/067—Mounting or locking missiles in cartridge cases
- F42B5/073—Mounting or locking missiles in cartridge cases using an auxiliary locking element
Definitions
- the present invention relates to small arms ammunition, and more particularly, to a method of achieving controlled, variable ballistic dispersion in automatic weapons.
- ballistic dispersion is the pattern of bullet strikes on the target which diverge from the point of aim due to a variety of factors.
- factors that may cause dispersion include a worn or defective firearm, variations in ammunition components or velocity, and wind or atmospheric conditions which result in a spread of impacts in the vertical and horizontal orientations.
- the goal of ammunition and firearm makers has been to decrease dispersion for greater accuracy in firearms.
- the primary mechanism available to ammunition makers to decrease dispersion is by controlling the shot start velocity of the bullets.
- the slower projectile will strike the target at a lower point than the faster projectile. This is due to varying ballistic trajectories which initially coincide at close range and diverge to a greater degree as the distance to the target increases.
- consistent shot start velocity The two factors leading to a consistent shot start velocity are a consistent propellant charge and a consistent pull strength (the force required to remove the bullet from the case mouth).
- a higher propellant charge will generally result in a higher shot start velocity.
- a higher pull strength will in a higher shot start velocity, as a higher pressure is able to build within the cartridge before the bullet is released from the case.
- consistent pull strengths are achieved through consistent case thicknesses, compositions, annealing levels and crimp strength.
- a consistent shot start velocity is particularly critical in long range rifles, where the difference in ballistic trajectories resulting from different velocities will have the most impact upon the actual point of impact. Consequently, great pains are taken to ensure as uniform a possible propellant charge and pull strength in ammunition rounds used by snipers, competition shooters, and the like.
- a method of achieving controlled, variable ballistic dispersion in an automatic weapon includes providing a plurality of cartridges, where each cartridge has a case and a projectile partially inserted into a mouth of the case forming a circumferential joint between the projectile and the mouth of the cartridge and held therein at a different pull strength.
- the method also includes providing a plurality of adhesive sealants, where each adhesive sealant of the plurality of adhesive sealants sets a design bullet pull strength that is different from each other adhesive sealant.
- the method also includes applying a different adhesive sealant to the circumferential joint of each of the plurality of cartridges, exposing the plurality of cartridges to UV radiation or other curing agent until the different adhesive sealants cure to develop the design bullet pull strength, and combining the plurality of cartridges having the different adhesive sealants in an ammunition belt to form a plurality of different velocities and trajectories of respective projectiles when fired in an automatic weapon.
- FIG. 1A is an exploded schematic view of a cartridge
- FIG. 1B is a schematic view of the cartridge of FIG. 1A with a projectile inserted into a case thereof;
- FIG. 2 is a schematic view of a back end of the case of FIG. 1A taken in the direction of line 2 - 2 ;
- FIG. 3 is a schematic view of applicators applying adhesive sealants in accordance with the invention.
- FIG. 4 is a schematic view of a UV light curing the adhesive sealants shown in FIG. 3 ;
- FIG. 5 is a schematic view illustrating a range of dispersion of projectiles.
- a conventional cartridge 100 includes a projectile (i.e., a bullet) 102 held partially within a case 104 forming a circumferential joint 110 between the projectile and the mouth of the case 104 .
- the case 104 contains a propellant for ejecting the bullet 102 from the case 104 when the cartridge 100 is fired.
- the cartridge 100 also includes a back end 106 (surrounded by a rim grippable by a firearm ejector mechanism) opposite the bullet 102 .
- the rim 106 typically houses a primer cup 108 filled with primer which ignites when struck with a firing pin, and which in turn ignites the propellant.
- an adhesive sealant 112 , 115 , 117 , 119 is being applied to a plurality of cartridges 100 A, 1006 on a first production line 120 .
- the adhesive sealant 112 , 115 , 117 , 119 is selected in order to set the bullet pull strength by bonding the projectile 102 to the case 104 in accordance with an aspect of the invention.
- the adhesive sealant 112 , 115 , 117 , 119 is formulated to adhere to the case 104 and the projectile 102 with a defined shear strength along the circumferential joint 110 .
- selecting a particular adhesive sealant 112 , 115 , 117 , 119 determines the pull strength needed to separate the projectile 102 from the case 104 .
- a plurality of adhesive sealants are provided 112 , 115 , 117 , 119 where each adhesive sealant of the plurality of adhesive sealants 112 , 115 , 117 , 119 is formulated to have adhesive properties that will result in a design bullet pull strength that is different from that resulting from each other adhesive sealant.
- each of the adhesive sealants 112 , 115 , 117 , 119 masks crimping variables, reducing their consequences and homogenizing the final bullet pull strength.
- the adhesive sealants 112 , 115 , 117 , 119 accomplish this masking effect through even distribution around the joint 110 formed between the cartridge case mouth and base of the projectile 102 .
- the plurality of adhesive sealants 112 , 115 , 117 , 119 are used in order to achieve varying desired design bullet pull strengths in a group of cartridges. As illustrated in FIG. 3 , the plurality of adhesive sealants are applied using applicators 114 , 118 that include non-contact precision jet valves 113 , 116 . The jet valves 113 , 116 apply the respective adhesive sealant 112 , 115 , 117 , 119 to the cartridge case mouth 110 and bullet 102 at the circumferential joint 110 of each of the cartridges 100 A, 100 B.
- the plurality of adhesive sealants 112 , 115 , 117 , 119 are specially formulated to exhibit very low viscosity and to wick around the cartridge case mouth along circumferential joint 110 resulting in a smooth, consistent distribution of the adhesive sealant 112 , 115 , 117 , 119 .
- more than one variation of adhesive sealant can be applied from different dispensers 114 , 118 or sealant reservoirs 112 A, 115 A, 117 A, 119 A, which alternate in the passing of completed cartridges to achieve different bullet pull strengths.
- this method of sealing for the existing process, the ability to environmentally seal and either increase or decrease bullet pull strength (i.e. neck tension) in any number of variations greater than one may be achieved on the same production line 120 .
- the adhesive sealant 112 , 115 , 117 , 119 is then cured in place on cartridges 100 A, 100 B, 100 C, 100 D on a second production line 130 using a UV light 122 having an array of UV LED curing lights 123 A, 123 B, 123 C, 123 D, 123 E.
- the UV exposure needed is no more than a few seconds. Further subsurface curing occurs anaerobically.
- the particular adhesive sealant 112 , 115 , 117 , 119 is exposed to UV radiation until the particular adhesive sealant cures to develop the design bullet pull strength.
- the cartridges 100 A, 100 B, 100 C, 100 D can be handled, tested, packaged and shipped in minutes without ever leaving the assembly line.
- the present invention is not necessarily limited to UV curing.
- adhesives cured via visible light could be used.
- the adhesive sealant 112 , 115 , 117 , 119 may have a composition comprising polyglycol dimethacrylate of 30-60% by weight, polyglycol dioctanoate of 30-60% by weight, saccharin of 1-5% by weight, cumene hydroperoxide of 1-5% by weight, and a photoinitiator of 1-5% by weight.
- the adhesive sealant 112 , 115 , 117 , 119 contains no class 1 ozone depleting chemicals. Accordingly, an additional advantage of the adhesive sealant 112 , 115 , 117 , 119 described herein is that it is 100% active with no solvents. This eliminates the toxic fumes and allows the adhesive sealant 112 , 115 , 117 , 119 to be applied continuously creating efficiency gains over previous batch processing methods.
- the adhesive sealant 112 , 115 , 117 , 119 may maximize bullet pull strength at approximately 300 lbf. As bullet pull strength increases, so does the pressure inside the case 104 prior to the bullet 102 firing. Accordingly, the adhesive sealants 112 , 115 , 117 , 119 may be formulated to achieve a desired range of bullet pull strengths. For example, the bullet pull strength range may be from 125 lbf to 300 lbf. It will be appreciated that the total pull strength is also a result of the bonded surface area in the circumferential joint. This is impacted by caliber and other dimensional factors.
- FIG. 5 illustrates the relationship between velocity and varying impact on the target.
- the same angle of firing with bullets launched at different velocities results in higher or lower impacts on the target.
- a shooter 200 is aiming an automatic weapon 202 at the same angle while firing rounds with each having a different adhesive sealant with different bullet pull strength.
- the cone of dispersion 204 of the bullets strike the ground at varying distances along different trajectories 206 , 208 , 210 and 212 .
- the round having the highest bullet pull strength due to the adhesive sealant will have the highest velocity and the farthest trajectory 206 .
- the round having the least bullet pull strength due to the adhesive sealant will have the lowest velocity and the least trajectory 212 , and so forth.
- an adhesive sealant with a higher bullet pull strength to a cartridge resulted in a gain of 130 feet per second over an unsealed cartridge and 102 feet per second gain over a lower strength sealant which itself exceeded the unsealed cartridge by 28 feet per second.
- the low strength adhesive sealant velocity would be 2,603 and the high strength velocity at 2,705 feet per second.
- the cartridges 100 A, 100 B are presented along a belt 120 which separates and aligns them.
- multiple dispensers 114 , 118 apply different adhesive sealants 112 , 115 , 117 , 119 from respective reservoirs 112 A, 115 A, 117 A, 119 A as determined by a computerized control system.
- every group of four non-tracing cartridges would receive low 112 , low to medium 115 , medium to high 117 or high strength 119 adhesive sealant.
- each of the rounds would then have a different bullet pull strength and therefore a different point of bullet release pressure and velocity as described above, despite being otherwise identical (within manufacturing tolerances) with respect to caliber, construction and propellant load.
- variable dispersion extends beyond the effect of different short start velocities on trajectory.
- dispersion effects to recoil effects and cyclic rate variation.
- recoil in general causes the muzzle of the automatic weapon to rise against the vehicle mount or the shoulder of a ground user, so the lower the recoil impulse the closer the next round is generally to the point of aim. Recoil begins on the bolt face as soon as the primer is impacted.
- the higher shot start pressures will add more significantly to the height of the impacts while the lower pressure impacts should be close to the point of aim or lower.
- a weapon firing for one second at high recoil levels would spread ten rounds wider in impact area on the target than the same weapon firing a lower recoil round.
- the lower pressure ammunition would be expected to have lower dispersion in automatic fire.
- the present invention by including a mix of both, can further achieve controlled dispersion by taking into these recoil effects.
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- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
A method of achieving controlled, variable ballistic dispersion in an automatic weapon is disclosed includes providing a plurality of cartridges, where each cartridge has a case and a projectile partially inserted into a mouth of the case forming a circumferential joint between the projectile and the mouth of the cartridge and held therein at a different pull strength. The method also includes providing a plurality of adhesive sealants, where each adhesive sealant of the plurality of adhesive sealants sets a design bullet pull strength that is different from each other adhesive sealant.
Description
- This application claims the benefit of U.S. Provisional Patent Application Ser. No. 62/748,853, filed on Oct. 22, 2018, the contents of which are herein incorporated by reference in their entirety.
- The present invention relates to small arms ammunition, and more particularly, to a method of achieving controlled, variable ballistic dispersion in automatic weapons.
- In firearms, ballistic dispersion is the pattern of bullet strikes on the target which diverge from the point of aim due to a variety of factors. Some examples of factors that may cause dispersion include a worn or defective firearm, variations in ammunition components or velocity, and wind or atmospheric conditions which result in a spread of impacts in the vertical and horizontal orientations.
- Historically, the goal of ammunition and firearm makers has been to decrease dispersion for greater accuracy in firearms. The primary mechanism available to ammunition makers to decrease dispersion is by controlling the shot start velocity of the bullets. When two otherwise identical bullets are fired from the same weapon, at the same target with the same aim point, under the same ambient conditions, but at different velocities, the slower projectile will strike the target at a lower point than the faster projectile. This is due to varying ballistic trajectories which initially coincide at close range and diverge to a greater degree as the distance to the target increases.
- The two factors leading to a consistent shot start velocity are a consistent propellant charge and a consistent pull strength (the force required to remove the bullet from the case mouth). A higher propellant charge will generally result in a higher shot start velocity. Likewise, a higher pull strength will in a higher shot start velocity, as a higher pressure is able to build within the cartridge before the bullet is released from the case. Generally, consistent pull strengths are achieved through consistent case thicknesses, compositions, annealing levels and crimp strength.
- A consistent shot start velocity is particularly critical in long range rifles, where the difference in ballistic trajectories resulting from different velocities will have the most impact upon the actual point of impact. Consequently, great pains are taken to ensure as uniform a possible propellant charge and pull strength in ammunition rounds used by snipers, competition shooters, and the like.
- With automatic firearms, accuracy is generally less important as such weapons are often used produce a suppressive field of fire over a larger area rather to place rounds on a specific target. Users of these weapons are often trained to scan the weapon side-to-side during fire to enhance this effect. While the effectiveness of modern machine guns is unquestioned, further improvements are possible.
- A method of achieving controlled, variable ballistic dispersion in an automatic weapon is disclosed. The method includes providing a plurality of cartridges, where each cartridge has a case and a projectile partially inserted into a mouth of the case forming a circumferential joint between the projectile and the mouth of the cartridge and held therein at a different pull strength. The method also includes providing a plurality of adhesive sealants, where each adhesive sealant of the plurality of adhesive sealants sets a design bullet pull strength that is different from each other adhesive sealant. The method also includes applying a different adhesive sealant to the circumferential joint of each of the plurality of cartridges, exposing the plurality of cartridges to UV radiation or other curing agent until the different adhesive sealants cure to develop the design bullet pull strength, and combining the plurality of cartridges having the different adhesive sealants in an ammunition belt to form a plurality of different velocities and trajectories of respective projectiles when fired in an automatic weapon.
- In view of the foregoing, it is an object of the present invention to provide a method of achieving controlled, variable ballistic dispersion in automatic weapons. These and other objects, aspects and advantages of the present invention will be better appreciated in view of the drawings and following detailed description of preferred embodiments.
-
FIG. 1A is an exploded schematic view of a cartridge; -
FIG. 1B is a schematic view of the cartridge ofFIG. 1A with a projectile inserted into a case thereof; -
FIG. 2 is a schematic view of a back end of the case ofFIG. 1A taken in the direction of line 2-2; -
FIG. 3 is a schematic view of applicators applying adhesive sealants in accordance with the invention; -
FIG. 4 is a schematic view of a UV light curing the adhesive sealants shown inFIG. 3 ; and -
FIG. 5 is a schematic view illustrating a range of dispersion of projectiles. - In the summary of the invention, provided above, and in the descriptions of certain preferred embodiments of the invention, reference is made to particular features of the invention, for example, method steps. It is to be understood that the disclosure of the invention in this specification includes all possible combinations of such particular features, regardless of whether a combination is explicitly described. For instance, where a particular feature is disclosed in the context of a particular aspect or embodiment of the invention, that feature can also be used, to the extent possible, in combination with and/or in the context of other particular aspects and embodiments of the invention, and in the invention generally.
- Referring initially to
FIGS. 1A-1B and 2 , aconventional cartridge 100 includes a projectile (i.e., a bullet) 102 held partially within acase 104 forming acircumferential joint 110 between the projectile and the mouth of thecase 104. Thecase 104 contains a propellant for ejecting thebullet 102 from thecase 104 when thecartridge 100 is fired. Thecartridge 100 also includes a back end 106 (surrounded by a rim grippable by a firearm ejector mechanism) opposite thebullet 102. Therim 106 typically houses aprimer cup 108 filled with primer which ignites when struck with a firing pin, and which in turn ignites the propellant. - Referring additionally to
FIG. 3 , anadhesive sealant cartridges 100A, 1006 on afirst production line 120. Theadhesive sealant projectile 102 to thecase 104 in accordance with an aspect of the invention. Theadhesive sealant case 104 and theprojectile 102 with a defined shear strength along thecircumferential joint 110. Thus, selecting a particularadhesive sealant projectile 102 from thecase 104. - In this example, a plurality of adhesive sealants are provided 112, 115, 117, 119 where each adhesive sealant of the plurality of
adhesive sealants adhesive sealants adhesive sealants joint 110 formed between the cartridge case mouth and base of theprojectile 102. This even distribution, due to the low viscosity and wicking properties of theadhesive sealants adhesive sealants - The plurality of
adhesive sealants FIG. 3 , the plurality of adhesive sealants are applied usingapplicators precision jet valves jet valves adhesive sealant cartridge case mouth 110 andbullet 102 at thecircumferential joint 110 of each of thecartridges adhesive sealants circumferential joint 110 resulting in a smooth, consistent distribution of theadhesive sealant - Accordingly, more than one variation of adhesive sealant can be applied from
different dispensers sealant reservoirs same production line 120. - Referring now to
FIG. 4 , theadhesive sealant cartridges second production line 130 using aUV light 122 having an array of UVLED curing lights adhesive sealant cartridges - In a particular aspect of the invention, the
adhesive sealant - The
adhesive sealant adhesive sealant adhesive sealant - The
adhesive sealant case 104 prior to thebullet 102 firing. Accordingly, theadhesive sealants - Referring additionally to
FIG. 5 , increasing or decreasing bullet pull strength has been shown to increase or decrease velocity of the projectile significantly without propellant loading variations.FIG. 5 illustrates the relationship between velocity and varying impact on the target. The same angle of firing with bullets launched at different velocities results in higher or lower impacts on the target. For example, ashooter 200 is aiming anautomatic weapon 202 at the same angle while firing rounds with each having a different adhesive sealant with different bullet pull strength. As a result the cone ofdispersion 204 of the bullets strike the ground at varying distances alongdifferent trajectories farthest trajectory 206. The round having the least bullet pull strength due to the adhesive sealant will have the lowest velocity and theleast trajectory 212, and so forth. - In one aspect, application of an adhesive sealant with a higher bullet pull strength to a cartridge resulted in a gain of 130 feet per second over an unsealed cartridge and 102 feet per second gain over a lower strength sealant which itself exceeded the unsealed cartridge by 28 feet per second. With a base velocity of 2,575 for the unsealed cartridge, the low strength adhesive sealant velocity would be 2,603 and the high strength velocity at 2,705 feet per second.
- According to ballistic tables for the .30 caliber 147 grain Full Metal Jacketed NATO projectile, applying low strength yields −12.86 Minute of Angle (MOA) of drop at 500 yards while higher strength results in −11.74 MOA of drop, which is a difference of 1.12 MOA or a 5.6″ difference through the adhesive sealant alone.
- In a particular aspect, the
cartridges belt 120 which separates and aligns them. Instead of a single dispenser applying the same adhesive sealant,multiple dispensers adhesive sealants respective reservoirs - For example, since four rounds of non-tracing ammunition are later combined with a single tracing round in a pattern described as “4+1” and the tracing ammunition would typically be sealed separately in its own run, for example with a further differing strength, every group of four non-tracing cartridges would receive low 112, low to
medium 115, medium to high 117 orhigh strength 119 adhesive sealant. When combined in the machine gun ammunition linking machine, each of the rounds would then have a different bullet pull strength and therefore a different point of bullet release pressure and velocity as described above, despite being otherwise identical (within manufacturing tolerances) with respect to caliber, construction and propellant load. - The ability of the present invention to achieve variable dispersion extends beyond the effect of different short start velocities on trajectory. For example, in practical use of a firearm including rounds with intentionally varied bullet strengths, there will be increased dispersion effects to recoil effects and cyclic rate variation.
- In the case of the former, recoil in general causes the muzzle of the automatic weapon to rise against the vehicle mount or the shoulder of a ground user, so the lower the recoil impulse the closer the next round is generally to the point of aim. Recoil begins on the bolt face as soon as the primer is impacted. When also considering the response of the weapon to different recoil impulses, it will be appreciated that the higher shot start pressures will add more significantly to the height of the impacts while the lower pressure impacts should be close to the point of aim or lower. For example, a weapon firing for one second at high recoil levels would spread ten rounds wider in impact area on the target than the same weapon firing a lower recoil round. Without as much muzzle rise, the lower pressure ammunition would be expected to have lower dispersion in automatic fire. The present invention, by including a mix of both, can further achieve controlled dispersion by taking into these recoil effects.
- In the case of the latter, it is believed that the “dwell time” between rounds is affected by increases or decreases in shot start pressures in gas and recoil operated weapons. The use of adhesive sealant, as described herein, to control the shot start pressure is will consequently further increase dispersion due to variable response of the weapon to the prior round's gas pressure level. For example, a weapon loaded with all low strength sealants would be expected to operate at a lower cyclic rate than those loaded with high strength sealant due to higher pressures generated internally from more complete propellant burn. A mixed belt of ammunition would then be expected to operate at a variable cyclic rate from round to round, amplifying the effect of shot pressures alone on ballistic dispersion.
- In general, the foregoing description is provided for exemplary and illustrative purposes; the present invention is not necessarily limited thereto. Rather, those skilled in the art will appreciate that additional modifications, as well as adaptations for particular circumstances, will fall within the scope of the invention as herein shown and described and of the claims appended hereto.
Claims (20)
1. A method of achieving variable ballistic dispersion from an automatic weapon, the method comprising:
assembling a plurality of ammunition cartridges such that each of the plurality of ammunition cartridges has a different respective predetermined pull strength;
packaging the plurality of ammunition cartridges into a group for firing sequentially from an automatic weapon.
2. The method of claim 1 , wherein assembling the plurality of ammunition cartridges includes applying a respective adhesive sealant to each of the plurality of ammunition cartridges in a respective circumferential joint between a respective case mouth and a respective projectile thereof, the respective adhesive sealants being formulated with different adhesive properties so as to achieve the different respective predetermined pull strengths.
3. The method of claim 2 , wherein applying the respective adhesive sealant to each of the plurality of ammunition cartridges includes injecting the respective adhesive sealant into the respective circumferential joint with an applicator having a non-contact jet valve.
4. The method of claim 3 , wherein each of the respective adhesive sealants is formulated to wick around the respective circumferential joint upon injection.
5. The method of claim 2 , wherein applying the respective adhesive sealant to each of the plurality of ammunition cartridges includes passing each of the plurality of ammunition cartridges down a common production line and applying each of the respective adhesive sealants from a respective applicator.
6. The method of claim 5 , wherein each of the respective applicators uses a non-contact jet valve to inject the respective adhesive sealant into the respective circumferential joint.
7. The method of claim 2 , wherein assembling the plurality of ammunition cartridges further includes at least partially curing each of the respective adhesive sealants using ultraviolet (UV) radiation.
8. The method of claim 1 , wherein each of the different respective predetermined pull strengths is at least 125 pounds force (lbf).
9. The method of claim 8 , wherein the different respective pull strengths vary from 125 lbf to 300 lbf.
10. The method of claim 1 , wherein the plurality of ammunition cartridges include at least three ammunition cartridges having the different respective predetermined pull strengths.
11. The method of claim 10 , wherein the plurality of ammunition cartridges include four ammunition cartridges having the different respective predetermined pull strengths.
12. A method of achieving variable ballistic dispersion from an automatic weapon, the method comprising:
passing a plurality of ammunition cartridges along a production line with at least first and second portions of the plurality of ammunition cartridges having respective adhesive sealants applied to respective circumferential joints between respective case mouths and respective projectiles thereof;
wherein the respective adhesive sealants are formulated with different adhesive properties such that the first and second portions of the plurality of ammunition cartridges will have different respective predetermined pull strengths.
13. The method of claim 12 , wherein each of the respective adhesive sealants is applied from a different applicator.
14. The method of claim 12 , wherein each of the respective adhesive sealants is applied from at least one applicator having a non-contact jet valve.
15. The method of claim 14 , wherein each of the respective adhesive sealants is formulated to wick around the respective circumferential joints upon injection.
16. The method of claim 12 , further comprising passing the plurality of ammunition cartridges past at least one ultraviolet (UV) light and at least partially curing each of the respective adhesive sealants using UV radiation.
17. The method of claim 12 , further comprising packaging the plurality of ammunition cartridges into a group for firing sequentially from an automatic weapon with ammunition cartridges from the first and second portions being interspersed.
18. A group of ammunition cartridges arranged for firing sequentially from an automatic weapon, the group comprising:
a first ammunition cartridge having a first predetermined pull strength of a first circumferential joint between a first case mouth and a first projectile; and
a second ammunition cartridge having a second predetermined pull strength of a second circumferential joint between a second case mouth and a second projectile, the first and second predetermined pull strengths being different.
19. The group of claim 18 , wherein the first and second predetermined pull strengths are determined by first and second adhesive sealants located, respectively, in first and second circumferential joints.
20. The group of claim 18 , further comprising a third ammunition cartridge having a third predetermined pull strength of a third circumferential joint between a third case mouth and a third projectile, the third predetermined pull strength being different from both the first and second predetermined pull strengths.
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US16/660,327 US20200124388A1 (en) | 2018-10-22 | 2019-10-22 | Method of achieving controlled, variable ballistic dispersion in automatic weapons |
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WO2020149909A1 (en) * | 2018-10-22 | 2020-07-23 | Harry Arnon | Method of achieving controlled, variable ballistic dispersion in automatic weapons |
DE102021103150A1 (en) | 2021-02-10 | 2022-08-11 | Ruag Ammotec Ag | Projectile cartridge, method for manufacturing a projectile cartridge and plant for manufacturing projectile cartridges |
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US7845281B2 (en) * | 2006-01-23 | 2010-12-07 | Richard Frank Sexton | Gun firing method for the simultaneous dispersion of projectiles in a pattern |
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US9360284B1 (en) * | 2013-03-15 | 2016-06-07 | Vista Outdoor Operations Llc | Manufacturing process to produce metalurgically programmed terminal performance projectiles |
EP3246656A1 (en) * | 2016-05-18 | 2017-11-22 | RUAG Ammotec | Projectile cartridge and method for producing a projectile cartridge |
US20200124387A1 (en) * | 2018-10-19 | 2020-04-23 | Harry Arnon | Achieving desired bullet pull strength using adhesive sealants and related methods |
US20200124388A1 (en) * | 2018-10-22 | 2020-04-23 | Harry Arnon | Method of achieving controlled, variable ballistic dispersion in automatic weapons |
-
2019
- 2019-10-22 US US16/660,327 patent/US20200124388A1/en not_active Abandoned
- 2019-10-22 WO PCT/US2019/057435 patent/WO2020149909A1/en active Application Filing
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020149909A1 (en) * | 2018-10-22 | 2020-07-23 | Harry Arnon | Method of achieving controlled, variable ballistic dispersion in automatic weapons |
DE102021103150A1 (en) | 2021-02-10 | 2022-08-11 | Ruag Ammotec Ag | Projectile cartridge, method for manufacturing a projectile cartridge and plant for manufacturing projectile cartridges |
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WO2020149909A1 (en) | 2020-07-23 |
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