Patent Application
20210364258
The present invention relates in general to the field of ammunition, specifically to compositions of matter and methods of making and using polymeric ammunition cartridge casings having at least 2 portions.
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Without limiting the scope of the invention, its background is described in connection with lightweight polymer cartridge casing ammunition. Conventional ammunition cartridge casings for rifles and machine guns, as well as larger caliber weapons, are made from brass, which is heavy, expensive, and potentially hazardous. There exists a need for an affordable lighter weight replacement for brass ammunition cartridge cases that can increase mission performance and operational capabilities. Lightweight polymer cartridge casing ammunition must meet the reliability and performance standards of existing fielded ammunition and be interchangeable with brass cartridge casing ammunition in existing weaponry. Reliable cartridge casings manufacture requires uniformity (e.g., bullet seating, bullet-to-casing fit, casing strength, etc.) from one cartridge to the next in order to obtain consistent pressures within the casing during firing prior to bullet and casing separation to create uniformed ballistic performance. Plastic cartridge casings have been known for many years but have failed to provide satisfactory ammunition that could be produced in commercial quantities with sufficient safety, ballistic, handling characteristics, and survive physical and natural conditions to which it will be exposed during the ammunition's intended life cycle; however, these characteristics have not been achieved.
Shortcomings of the known methods of producing plastic or substantially plastic ammunition include the possibility of the projectile being pushed into the cartridge casing, the bullet being held too light such that the bullet can fall out, the bullet being held insufficient to create sufficient chamber pressure, the bullet pull not being uniform from round to round, and the cartridge not being able to maintain the necessary pressure, portions of the cartridge casing breaking off upon firing causing the weapon to jam or damage or danger when subsequent rounds are fired or when the casing portions themselves become projectiles. To overcome the above shortcomings, improvements in cartridge case design and performance polymer materials are needed.
The present invention provides a method of forming a chamber in a firearm wherein the chamber is adapted to fit a polymer ammunition cartridge comprising the steps of: providing a barrel blank; providing a reamer having the dimensions of the desired polymer ammunition cartridge, wherein the reamer comprising a reamer profile corresponding to an ammunition cartridge having a reduced neck height comprising: a shortened neck having a projectile aperture, wherein the shortened neck is reduced by 25-100% of the neck height of a standard cartridge neck; a shoulder extending from the shortened neck to a cartridge side wall; and wherein the cartridge side wall extends from the shoulder to the base to form an interior propellant chamber; wherein the base comprises an extraction ring, a primer recess positioned in the base in communication with the propellant chamber through a flash hole that extends from the primer recess into the propellant chamber; contacting the reamer with the barrel blank to form a reamed barrel having a chamber having the corresponding profile that mates to the reamer profile; removing the reamer from the reamed barrel.
The chamber is adapted accept a 5.56 mm, 7.62 mm, 12.7 mm, 14.5 mm, .223, .243, .277, .300, .308, .338, or a .50 caliber ammunition cartridge. The polymer ammunition cartridge is a 5.56 mm, 7.62 mm, 12.7 mm, 14.5 mm, .223, .243, .277, .300, .308, .338, or a .50 caliber ammunition cartridge. The shortened neck is reduced by 5 to 100% compared to the neck of a conventional ammunition cartridge. The barrel is further treated with a friction reducing substance. The barrel is further heat treated.
The present invention provides that any of the embodiments may include a nose adapted to fit a 5.56 mm, 7.62 mm, 12.7 mm, 14.5 mm, .223, .243, .277, .300, .308, .338, or a .50 caliber projectile. Similarly, the nose may mate to a middle body of a 5.56 mm, 7.62 mm, 12.7 mm, 14.5 mm, .223, .243, .277, .300, .308, .338, or a .50 caliber ammunition cartridge.
The present invention provides that any of the embodiments may include a shortened neck that is reduced by 5 to 100% compared to the neck of a conventional ammunition cartridge, e.g., 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100% and incremental variations thereof.
The present invention provided polymer ammunition cases (cartridges) injection molded over a primer insert and methods of making thereof. The present invention provided polymer ammunition noses that mate to the polymer ammunition cases to be loaded to make polymer ammunition and methods of making thereof.
For a more complete understanding of the features and advantages of the present invention, reference is now made to the detailed description of the invention along with the accompanying figures and in which:
While the making and using of various embodiments of the present invention are discussed in detail below, it should be appreciated that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed herein are merely illustrative of specific ways to make and use the invention and do not delimit the scope of the invention.
To facilitate the understanding of this invention, a number of terms are defined below. Terms defined herein have meanings as commonly understood by a person of ordinary skill in the areas relevant to the present invention. Terms such as “a”, “an” and “the” are not intended to refer to only a singular entity, but include the general class of which a specific example may be used for illustration. The terminology herein is used to describe specific embodiments of the invention, but their usage does not delimit the invention, except as outlined in the claims.
Reliable cartridge manufacture requires uniformity from one cartridge to the next in order to obtain consistent ballistic performance. Among other considerations, proper bullet seating and bullet-to-casing fit is required. In this manner, a desired pressure develops within the casing during firing prior to bullet and casing separation. Historically, bullets employ a cannelure, which is a slight annular depression formed in a surface of the bullet at a location determined to be the optimal seating depth for the bullet. In this manner, a visual inspection of a cartridge could determine whether or not the bullet is seated at the proper depth. Once the bullet is inserted into the casing to the proper depth, one of two standard procedures is incorporated to lock the bullet in its proper location. One method is the crimping of the entire end of the casing into the cannelure. A second method does not crimp the casing end; rather the bullet is pressure fitted into the casing.
The polymeric ammunition cartridges of the present invention are of a caliber typically carried by soldiers in combat for use in their combat weapons. The present invention is not limited to the described caliber and is believed to be applicable to other calibers as well. This includes various small and medium caliber munitions, including 5.45 mm, 5.56 mm, 6.5 mm, 6.8 mm, 7 mm, 7.62 mm, 8 mm, 9 mm, 10 mm, 12.7 mm, 14.5 mm, 20 mm, 25 mm, 30 mm, 40 mm, .22, .22-250, .223, .243, .25-06, .270, .277, .300, .30-30, .30-40, 3.06, .300, .303, .308, .338, .357, .38, .380, .40, .44, .45, .45-70, .50 BMG caliber ammunition, cases, cartridges and components of ammunition, cases, cartridges. The ammunition and ammunition cartridge as well as the nose and base used to assemble the ammunition and the cartridge has a standardized size, shape and dimensions based on the caliber and chamber of the gun in which it is chambered. The chamber and the ammunition mate such that they have the same characteristics. The specific neck, shoulder, case diameter projectile aperture, and case length are known to the skilled and those standard measurements are available and known. In other embodiments of the instant application, the ammunition and ammunition cartridge as well as the nose and base used to assemble the ammunition and the cartridge have a nonstandardized size, shape and dimensions as described and illustrated herein.
The middle body component 28 is connected to a substantially cylindrical coupling element 30 of the substantially cylindrical insert 32. Coupling element 30, as shown may be configured as a male element, however, all combinations of male and female configurations is acceptable for coupling elements 30 and coupling end 22 in alternate embodiments of the invention. Coupling end 22 of bullet-end component 18 fits about and engages coupling element 30 of a substantially cylindrical insert 32. The substantially cylindrical insert 32 includes a substantially cylindrical coupling element 30 extending from a bottom surface 34 that is opposite a top surface 36. Located in the top surface 36 is a primer recess 38 that extends toward the bottom surface 34. A primer flash hole 40 is located in the primer flash hole 40 and extends through the bottom surface 34 into the powder chamber 14. The coupling end 22 extends the polymer through the primer flash hole 40 to form an aperture coating 42 while retaining a passage from the top surface 36 through the bottom surface 34 and into the powder chamber 14 to provide support and protection about the primer flash hole 40. When contacted the coupling end 22 interlocks with the substantially cylindrical coupling element 30, through the coupling element 30 that extends with a taper to a smaller diameter at the tip 44 to form a physical interlock between substantially cylindrical insert 32 and middle body component 28. Polymer casing 12 also has a substantially cylindrical open-ended middle body component 28. The middle body component extends from a forward end opening 16 to coupling element 22. The middle body component typically has a wall thickness between about 0.003 and about 0.200 inches and more preferably between about 0.005 and more preferably between about 0.150 inches about 0.010 and about 0.050 inches.
The bullet-end 16, middle body 18 and bottom surface 34 define the interior of powder chamber 14 in which the powder charge (not shown) is contained. The interior volume of powder chamber 14 may be varied to provide the volume necessary for complete filling of the chamber 14 by the propellant chosen so that a simplified volumetric measure of propellant can be utilized when loading the cartridge. Either a particulate or consolidated propellant can be used.
The substantially cylindrical insert 32 also has a flange 46 cut therein and a primer recess 38 formed therein for ease of insertion of the primer (not shown). The primer recess 38 is sized so as to receive the primer (not shown) in an interference fit during assembly. A primer flash hole 40 communicates through the bottom surface 34 of substantially cylindrical insert 32 into the powder chamber 14 so that upon detonation of primer (not shown) the powder in powder chamber 14 will be ignited.
Projectile (not shown) is held in place within chamber case neck 26 at forward opening 16 by an interference fit. Mechanical crimping of the forward opening 16 can also be applied to increase the bullet pull force. The bullet (not shown) may be inserted into place following the completion of the filling of powder chamber 14. Projectile (not shown) can also be injection molded directly onto the forward opening 16 prior to welding or bonding together using solvent, adhesive, spin-welding, vibration-welding, ultrasonic-welding or laser-welding techniques. The welding or bonding increases the joint strength so the casing can be extracted from the hot gun casing after firing at the cook-off temperature.
The bullet-end and bullet components can then be welded or bonded together using solvent, adhesive, spin-welding, vibration-welding, ultrasonic-welding or laser-welding techniques. The welding or bonding increases the joint strength so the casing can be extracted from the hot gun casing after firing at the cook-off temperature. An optional first and second annular grooves (cannelures) may be provided in the bullet-end in the interlock surface of the male coupling element to provide a snap-fit between the two components. The cannelures formed in a surface of the bullet at a location determined to be the optimal seating depth for the bullet. Once the bullet is inserted into the casing to the proper depth to lock the bullet in its proper location. One method is the crimping of the entire end of the casing into the cannelures.
The bullet-end and middle body components can then be welded or bonded together using solvent, adhesive, spin-welding, vibration-welding, ultrasonic-welding or laser-welding techniques. The welding or bonding increases the joint strength so the casing can be extracted from the hot gun casing after firing at the cook-off temperature.
The middle body component 28 is connected to a substantially cylindrical coupling element 30 of the substantially cylindrical insert 32. Coupling element 30, as shown may be configured as a male element, however, all combinations of male and female configurations is acceptable for coupling elements 30 and coupling end 22 in alternate embodiments of the invention. Coupling end 22 of bullet-end component 18 fits about and engages coupling element 30 of a substantially cylindrical insert 32. The substantially cylindrical insert 32 includes a substantially cylindrical coupling element 30 extending from a bottom surface 34 that is opposite a top surface 36. Located in the top surface 36 is a primer recess 38 that extends toward the bottom surface 34. A primer flash hole 40 is located in the primer flash hole 40 and extends through the bottom surface 34 into the powder chamber 14. The coupling end 22 extends the polymer through the primer flash hole 40 to form an aperture coating 42 while retaining a passage from the top surface 36 through the bottom surface 34 and into the powder chamber 14 to provides support and protection about the primer flash hole 40. When contacted the coupling end 22 interlocks with the substantially cylindrical coupling element 30, through the coupling element 30 that extends with a taper to a smaller diameter at the tip 44 to form a physical interlock between substantially cylindrical insert 32 and middle body component 28. Polymer casing 12 also has a substantially cylindrical open-ended middle body component 28. The middle body component extends from a forward end opening 16 to coupling element 22. Located in the top surface 36 is a primer recess 38 that extends toward the bottom surface 34 with a diffuser 50 positioned in the primer recess 38. The diffuser 50 includes a diffuser aperture 52 that aligns with the primer flash hole 40. The diffuser 50 is a device that is used to divert the affects of the primer (not shown) off of the polymer. The affects being the impact from igniting the primer as far as pressure and heat to divert the energy of the primer off of the polymer and directing it to the flash hole.
The external shoulder 24a, the external neck 26a, and the external shoulder plane angle 27a have fixed values to mate them to the chamber. The relationship between the external shoulder 24a, an external neck 26a, and external shoulder plane angle 27a are caliber ammunition and weapons platform specific and have values. In contrast, the internal shoulder 24b, the internal neck 26b, and the internal shoulder plane angle 27b have no such constraints and can be varied to form the desired internal shoulder profile.
For example, when the internal shoulder plane angle 27b is the same as the external shoulder plane angle 27a the external shoulder 24a and internal shoulder 24b are parallel. When the internal shoulder plane angle 27b is the same as the external shoulder plane angle 27a, the external shoulder 24a and internal shoulder 24b are parallel. When the internal shoulder plane angle 27b is the larger than the external shoulder plane angle 27a, internal shoulder 24b is longer than the external shoulder 24a such that the internal shoulder 24b transitions to the internal side wall 29b at a distance further away from the external shoulder 24a. Thus making a larger distance from the internal shoulder 24b to the external shoulder 24a as you move toward the shoulder bottom 25c. Conversely, when the internal shoulder plane angle 27b is the smaller than the external shoulder plane angle 27a, there is a larger distance from the internal shoulder 24b to the external shoulder 24a as you move up the shoulder toward internal shoulder 24b. As a result, the internal shoulder length 25a is determined by the distance from the internal shoulder top 25b that extends from the internal neck 26b to internal shoulder bottom 25c that extends from the internal side wall 29b. This internal shoulder length 25a may be varied as necessary to achieve the desired properties (e.g., pressure, velocity, temperature, etc.). The internal shoulder plane angle 27b is defined as the angle between the internal shoulder 24b, and the internal neck 26b or the angle between the internal shoulder 24b and the internal side wall 29b.
Therefore the internal shoulder 24b is parallel to the external shoulder 24a over the internal shoulder length. The skilled artisan will readily understand that the transition plane angle 27c can be adjusted to move the transition bottom 25d up and down the interior side wall 29b. Similarly the number of transition segments 24c can be varied to adjust to move the transition bottom 25d up and down the interior side wall 29b. In addition, the transition segments 24c may be a plethora of short segments connected together to from an arc or radii. The number of transition segments 24c may be such that an almost smooth arc is formed or so few that an angular profile is formed. Similarly, the angle of each transition segments 24c relative to the adjacent transition segments may be similar or different as necessary.
The external shoulder 24a, the external neck 26a, and the external shoulder plane angle 27a have fixed values to mate them to the chamber. The relationship between the external shoulder 24a, an external neck 26a, and external shoulder plane angle 27a are caliber ammunition and weapons platform specific and have values. In contrast, the internal shoulder 24b, the internal neck 26b, and the internal shoulder plane angle 27b have no such constraints and can be varied to form the desired internal shoulder profile.
For example, when the internal shoulder plane angle 27b is the same as the external shoulder plane angle 27a the external shoulder 24a and internal shoulder 24b are parallel. When the internal shoulder plane angle 27b is the same as the external shoulder plane angle 27a, the external shoulder 24a and internal shoulder 24b are parallel. When the internal shoulder plane angle 27b is the larger than the external shoulder plane angle 27a, internal shoulder 24b is longer than the external shoulder 24a such that the internal shoulder 24b transitions to the internal side wall 29b at a distance further away from the external shoulder 24a. Thus making a larger distance from the internal shoulder 24b to the external shoulder 24a as you move toward the shoulder bottom 25c. Conversely, when the internal shoulder plane angle 27b is the smaller than the external shoulder plane angle 27a, there is a larger distance from the internal shoulder 24b to the external shoulder 24a as you move up the shoulder toward internal shoulder 24b.
In another embodiment of the present invention the ammunition, ammunition cartridge, and components may chamber a standard projectile (e.g., 0.45 mm, 5.56 mm, 6.5 mm, 6.8 mm, 7 mm, 7.62 mm, 8 mm, 9 mm, 10 mm, 12.7 mm, 14.5 mm, 20 mm, 25 mm, 30 mm, 40 mm, .22, .22-250, .223, .243, .25-06, .270, .277, .300, .30-30, .30-40, 3.06, .300, .303, .308, .338, .357, .38, .380, .40, .44, .45, .45-70, .50 caliber) or a nonstandard projectile in a non-traditional cartridge. The nontraditional cartridge may be a result of the neck diameter, neck length, neck thickness, shoulder angle, shoulder length, shoulder angle, shoulder thickness may be varied to form a unique ammunition, ammunition cartridge, and components.
The polymeric ammunition cartridges of the present invention are of a caliber typically carried by soldiers in combat for use in their combat weapons. The present invention is not limited to the described caliber and is believed to be applicable to other calibers as well. This includes various small and medium caliber munitions, including 5.45 mm, 5.56 mm, 6.5 mm, 6.8 mm, 7 mm, 7.62 mm, 8 mm, 9 mm, 10 mm, 12.7 mm, 14.5 mm, 20 mm, 25 mm, 30 mm, 40 mm, .22, .22-250, .223, .243, .25-06, .270, .277, .300, .30-30, .30-40, 3.06, .300, .303, .308, .338, .357, .38, .380, .40, .44, .45, .45-70, .50 BMG caliber ammunition, cases, cartridges and components of ammunition, cases, cartridges. The ammunition and ammunition cartridge as well as the nose and base used to assemble the ammunition and the cartridge has a standardized size, shape and dimensions based on the caliber and chamber of the gun in which it is chambered. The chamber and the ammunition mate such that they have the same characteristics. The specific neck, shoulder, case diameter projectile aperture, and case length are known to the skilled and those standard measurements are available and known. In other embodiments of the instant application, the ammunition and ammunition cartridge as well as the nose and base used to assemble the ammunition and the cartridge have a nonstandardized size, shape and dimensions as described and illustrated herein.
To illustrate some embodiments of the nontraditional cases various nose configurations are shown in
These configurations can be used to effectively form a nose with no shoulder (e.g., 30A), shoulder with no nose (38A) and every variation in-between. When the nontraditional ammunition of the present invention is made the corresponding platform chamber must have the mating profile of the ammunition to allow the fitting of the ammunition, firing and ejecting of the ammunition. The present invention includes automatic and semiautomatic rifles having a chamber that mates and fits the nontraditional ammunition of the instant invention.
In addition, the interior neck, exterior neck, external shoulder and the nose junction may individually be textured in the form of one or more selected from etching, grooves, hatching, knurling, a texture, rings, and free formed textures.
The chamber neck 26 and the internal neck 26b are shown as generally parallel to each other; however, the chamber neck 26 and the internal neck 26b may be tapered such that at the mouth 58 the distance from the chamber neck 26 to the internal neck 26b is less than the distance from the chamber neck 26 to the internal neck 26b at the shoulder 24. In addition, the mouth 58 may include a groove (not shown) that extends around the internal neck 26b. The internal neck 26b may include a texturing; however, distance from the internal neck 26b to the chamber neck 26 may be accessed using the average distance from the top texture surface (not shown) to the bottom texture surface (not shown) of the texturing, the top texture surface (not shown) of the texturing or the bottom texture surface (not shown) of the texturing.
The insert may be made by any method including MIM, cold forming, milling, machining, printing, 3D printing, etching and so forth.
The polymeric and composite casing components may be injection molded including overmolding into the flash aperture. Polymeric materials for the bullet-end and middle body components must have propellant compatibility and resistance to gun cleaning solvents and grease, as well as resistance to chemical, biological and radiological agents. The polymeric materials must have a temperature resistance higher than the cook-off temperature of the propellant, typically about 320° F. The polymeric materials must have elongation-to-break values that to resist deformation under interior ballistic pressure as high as 60,000 psi in all environments (temperatures from about −65 to about 320° F. and humidity from 0 to 100% RH). According to one embodiment, the middle body component is either molded onto or snap-fit to the casing head-end component after which the bullet-end component is snap-fit or interference fit to the middle body component. The components may be formed from high-strength polymer, composite or ceramic.
Examples of suitable high strength polymers include composite polymer material including a tungsten metal powder, nylon 6/6, nylon 6, and glass fibers; and a specific gravity in a range of 3-10. The tungsten metal powder may be 50%-96% of a weight of the bullet body. The polymer material also includes about 0.5-15%, preferably about 1-12%, and most preferably about 2-9% by weight, of nylon 6/6, about 0.5-15%, preferably about 1-12%, and most preferably about 2-9% by weight, of nylon 6, and about 0.5-15%, preferably about 1-12%, and most preferably about 2-9% by weight, of glass fibers. It is most suitable that each of these ingredients be included in amounts less than 10% by weight. The cartridge casing body may be made of a modified ZYTEL resin, available from E.I. DuPont De Nemours Co., a modified 612 nylon resin, modified to increase elastic response.
Examples of suitable polymers include polyurethane prepolymer, cellulose, fluoro-polymer, ethylene inter-polymer alloy elastomer, ethylene vinyl acetate, nylon, polyether imide, polyester elastomer, polyester sulfone, polyphenyl amide, polypropylene, polyvinylidene fluoride or thermoset polyurea elastomer, acrylics, homopolymers, acetates, copolymers, acrylonitrile-butadinen-styrene, thermoplastic fluoro polymers, inomers, polyamides, polyamide-imides, polyacrylates, polyatherketones, polyaryl-sulfones, polybenzimidazoles, polycarbonates, polybutylene, terephthalates, polyether imides, polyether sulfones, thermoplastic polyimides, thermoplastic polyurethanes, polyphenylene sulfides, polyethylene, polypropylene, polysulfones, polyvinylchlorides, styrene acrylonitriles, polystyrenes, polyphenylene, ether blends, styrene maleic anhydrides, polycarbonates, allyls, aminos, cyanates, epoxies, phenolics, unsaturated polyesters, bismaleimides, polyurethanes, silicones, vinylesters, or urethane hybrids. Examples of suitable polymers also include aliphatic or aromatic polyamide, polyeitherimide, polysulfone, polyphenylsulfone, poly-phenylene oxide, liquid crystalline polymer and polyketone. Examples of suitable composites include polymers such as polyphenylsulfone reinforced with between about 30 and about 70 wt %, and preferably up to about 65 wt % of one or more reinforcing materials selected from glass fiber, ceramic fiber, carbon fiber, mineral fillers, organo nanoclay, or carbon nanotube. Preferred reinforcing materials, such as chopped surface-treated E-glass fibers provide flow characteristics at the above-described loadings comparable to unfilled polymers to provide a desirable combination of strength and flow characteristics that permit the molding of head-end components. Composite components can be formed by machining or injection molding. Finally, the cartridge case must retain sufficient joint strength at cook-off temperatures. More specifically, polymers suitable for molding of the projectile-end component have one or more of the following properties: Yield or tensile strength at −65° F.>10,000 psi Elongation-to-break at −65° F.>15% Yield or tensile strength at 73° F.>8,000 psi Elongation-to-break at 73° F.>50% Yield or tensile strength at 320° F.>4,000 psi Elongation-to-break at 320° F.>80%. Polymers suitable for molding of the middle-body component have one or more of the following properties: Yield or tensile strength at −65° F.>10,000 psi Yield or tensile strength at 73° F.>8,000 psi Yield or tensile strength at 320° F.>4,000 psi.
Commercially available polymers suitable for use in the present invention thus include polyphenylsulfones; copolymers of polyphenylsulfones with polyether-sulfones or polysulfones; copolymers and blends of polyphenylsulfones with polysiloxanes; poly(etherimide-siloxane); copolymers and blends of polyetherimides and polysiloxanes, and blends of polyetherimides and poly(etherimide-siloxane) copolymers; and the like. Particularly preferred are polyphenylsulfones and their copolymers with poly-sulfones or polysiloxane that have high tensile strength and elongation-to-break to sustain the deformation under high interior ballistic pressure. Such polymers are commercially available, for example, RADEL R5800 polyphenylesulfone from Solvay Advanced Polymers. The polymer can be formulated with up to about 10 wt % of one or more additives selected from internal mold release agents, heat stabilizers, anti-static agents, colorants, impact modifiers and UV stabilizers.
The polymers of the present invention can also be used for conventional two-piece metal-plastic hybrid cartridge case designs and conventional shotgun shell designs. One example of such a design is an ammunition cartridge with a one-piece substantially cylindrical polymeric cartridge casing body with an open projectile-end and an end opposing the projectile-end with a male or female coupling element; and a cylindrical metal cartridge casing head-end component with an essentially closed base end with a primer hole opposite an open end having a coupling element that is a mate for the coupling element on the opposing end of the polymeric cartridge casing body joining the open end of the head-end component to the opposing end of the polymeric cartridge casing body. The high polymer ductility permits the casing to resist breakage.
One embodiment includes a 2 cavity prototype mold having an upper portion and a base portion for a 5.56 case having a metal insert over-molded with a Nylon 6 (polymer) based material. In this embodiment the polymer in the base includes a lip or flange to extract the case from the weapon. One 2-cavity prototype mold to produce the upper portion of the 5.56 case can be made using a stripper plate tool using an Osco hot spur and two subgates per cavity. Another embodiment includes a subsonic version, the difference from the standard and the subsonic version is the walls are thicker thus requiring less powder.
This will decrease the velocity of the bullet thus creating a subsonic round.
The extracting inserts is used to give the polymer case a tough enough ridge and groove for the weapons extractor to grab and pull the case out the chamber of the gun. The extracting insert is made of 17-4 ss that is hardened to 42-45rc. The insert may be made of aluminum, brass, cooper, steel or even an engineered resin with enough tensile strength.
The insert is over molded in an injection molded process using a nano clay particle filled Nylon material. The inserts can be machined or stamped. In addition, an engineered resin able to withstand the demand on the insert allows injection molded and/or even transfer molded.
One of ordinary skill in the art will know that many propellant types and weights can be used to prepare workable ammunition and that such loads may be determined by a careful trial including initial low quantity loading of a given propellant and the well known stepwise increasing of a given propellant loading until a maximum acceptable load is achieved. Extreme care and caution is advised in evaluating new loads. The propellants available have various burn rates and must be carefully chosen so that a safe load is devised.
The description of the preferred embodiments should be taken as illustrating, rather than as limiting, the present invention as defined by the claims. As will be readily appreciated, numerous combinations of the features set forth above can be utilized without departing from the present invention as set forth in the claims. Such variations are not regarded as a departure from the spirit and scope of the invention, and all such modifications are intended to be included within the scope of the following claims.
It will be understood that particular embodiments described herein are shown by way of illustration and not as limitations of the invention. The principal features of this invention can be employed in various embodiments without departing from the scope of the invention. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, numerous equivalents to the specific procedures described herein. Such equivalents are considered to be within the scope of this invention and are covered by the claims.
The use of the word “a” or “an” when used in conjunction with the term “comprising” in the claims and/or the specification may mean “one,” but it is also consistent with the meaning of “one or more,” “at least one,” and “one or more than one.” The use of the term “or” in the claims is used to mean “and/or” unless explicitly indicated to refer to alternatives only or the alternatives are mutually exclusive, although the disclosure supports a definition that refers to only alternatives and “and/or.” Throughout this application, the term “about” is used to indicate that a value includes the inherent variation of error for the device, the method being employed to determine the value, or the variation that exists among the study subjects. As used in this specification and claim(s), the words “comprising” (and any form of comprising, such as “comprise” and “comprises”), “having” (and any form of having, such as “have” and “has”), “including” (and any form of including, such as “includes” and “include”) or “containing” (and any form of containing, such as “contains” and “contain”) are inclusive or open-ended and do not exclude additional, unrecited elements or method steps.
The term “or combinations thereof” as used herein refers to all permutations and combinations of the listed items preceding the term. For example, “A, B, C, or combinations thereof” is intended to include at least one of: A, B, C, AB, AC, BC, or ABC, and if order is important in a particular context, also BA, CA, CB, CBA, BCA, ACB, BAC, or CAB. Continuing with this example, expressly included are combinations that contain repeats of one or more item or term, such as BB, AAA, AB, BBC, AAABCCCC, CBBAAA, CABABB, and so forth. The skilled artisan will understand that typically there is no limit on the number of items or terms in any combination, unless otherwise apparent from the context.
This application is a Continuation application of U.S. patent application Ser. No. 17/068,832 filed Oct. 30, 2020, which is a Divisional application of Ser. No. 15/808,859 filed on Nov. 9, 2017 now U.S. Pat. No. 10,876,822, and claims the benefit of U.S. patent application Ser. No. 29/644,794 filed on Apr. 20, 2018 now U.S. Pat. No. D882,019, and claims the benefit of U.S. patent application Ser. No. 29/644,797 filed Apr. 20, 2018 now U.S. Pat. No. D881,323, and claims the benefit of U.S. patent application Ser. No. 29/644,798 filed Apr. 20, 2018 now U.S. Pat. No. D882,020, and claims the benefit of U.S. patent application Ser. No. 29/644,805 filed Apr. 20, 2018 now U.S. Pat. No. D881,324, and claims the benefit of U.S. patent application Ser. No. 29/644,808 filed Apr. 20, 2018 now D882,021, and claims the benefit of U.S. patent application Ser. No. 29/644,810 filed Apr. 20, 2018 now U.S. Pat. No. D881,325, and claims the benefit of U.S. patent application Ser. No. 29/644,811 filed Apr. 20, 2018 now U.S. Pat. No. D881,326, and claims the benefit of U.S. patent application Ser. No. 29/644,816 filed Apr. 20, 2018 now U.S. Pat. No. D882,022, and claims the benefit of U.S. patent application Ser. No. 29/644,820 filed Apr. 20, 2018 now U.S. Pat. No. D881,327, and claims the benefit of U.S. patent application Ser. No. 29/644,824 filed Apr. 20, 2018 now U.S. Pat. No. D881,328, and claims the benefit of U.S. patent application Ser. No. 29/644,825 filed Apr. 20, 2018 now U.S. Pat. No. D882,023, and claims the benefit of U.S. patent application Ser. No. 29/644,828 filed Apr. 20, 2018 now U.S. Patent No. D882,024, and claims the benefit of U.S. patent application Ser. No. 29/644,831 filed Apr. 20, 2018 now U.S. Pat. No. D882,025, and claims the benefit of U.S. patent application Ser. No. 29/644,835 filed Apr. 20, 2018 now U.S. Pat. No. D882,026, and claims the benefit of U.S. patent application Ser. No. 29/644,838 filed Apr. 20, 2018 now U.S. Pat. No. D882,027, and claims the benefit of U.S. patent application Ser. No. 29/644,840 filed Apr. 20, 2018 now U.S. Pat. No. D882,720, and claims the benefit of U.S. patent application Ser. No. 29/644,842 filed Apr. 20, 2018 now U.S. Pat. No. D884,115, and claims the benefit of U.S. patent application Ser. No. 29/644,843 filed Apr. 20, 2018 now U.S. Pat. No. D882,028, and claims the benefit of U.S. patent application Ser. No. 29/644,844 filed Apr. 20, 2018 now U.S. Pat. No. D913,403, and claims the benefit of U.S. patent application Ser. No. 29/644,847 filed Apr. 20, 2018 now U.S. Pat. No. D882,721, and claims the benefit of U.S. patent application Ser. No. 29/644,849 filed Apr. 20, 2018 now U.S. Pat. No. D882,029, and claims the benefit of U.S. patent application Ser. No. 29/644,853 filed Apr. 20, 2018 now U.S. Pat. No. D882,030, and claims the benefit of U.S. patent application Ser. No. 29/644,855 filed Apr. 20, 2018 now U.S. Pat. No. D882,031, and claims the benefit of U.S. patent application Ser. No. 29/644,859 filed Apr. 20, 2018 now U.S. Pat. No. D903,038, and claims the benefit of U.S. patent application Ser. No. 29/644,862 filed Apr. 20, 2018 now U.S. Pat. No. D882,722, and claims the benefit of U.S. patent application Ser. No. 29/644,863 filed Apr. 20, 2018 now U.S. Pat. No. D882,723, and claims the benefit of U.S. patent application Ser. No. 29/644,864 filed Apr. 20, 2018 now U.S. Pat. No. D882,724, and claims the benefit of U.S. patent application Ser. No. 29/644,865 filed Apr. 20, 2018 now U.S. Pat. No. D903,039, and claims the benefit of U.S. patent application Ser. No. 29/644,867 filed Apr. 20, 2018 now U.S. Pat. No. D882,032, and claims the benefit of U.S. patent application Ser. No. 29/644,869 filed Apr. 20, 2018 now U.S. Pat. No. D882,033, and claims the benefit of U.S. patent application Ser. No. 29/646,297 filed May 3, 2018, and claims the benefit of U.S. patent application Ser. No. 29/646,298 filed May 3, 2018, and claims the benefit of U.S. patent application Ser. No. 29/646,299 filed May 3, 2018, and claims the benefit of U.S. patent application Ser. No. 29/646,300 filed May 3, 2018, the contents of each are hereby incorporated by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17068832 | Oct 2020 | US |
| Child | 17376510 | US | |
| Parent | 16184519 | Nov 2018 | US |
| Child | 17068832 | US | |
| Parent | 15808859 | Nov 2017 | US |
| Child | 16184519 | US |
