US20230143951A1 - Firearm barrel having a cartridge chamber - Google Patents
Firearm barrel having a cartridge chamber Download PDFInfo
- Publication number
- US20230143951A1 US20230143951A1 US17/524,143 US202117524143A US2023143951A1 US 20230143951 A1 US20230143951 A1 US 20230143951A1 US 202117524143 A US202117524143 A US 202117524143A US 2023143951 A1 US2023143951 A1 US 2023143951A1
- Authority
- US
- United States
- Prior art keywords
- cartridge
- barrel
- shoulder
- chamber
- bore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000004323 axial length Effects 0.000 claims description 29
- 238000010304 firing Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000007704 transition Effects 0.000 abstract description 5
- 239000000843 powder Substances 0.000 description 11
- 238000003466 welding Methods 0.000 description 11
- 238000000605 extraction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 239000003380 propellant Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 210000000746 body region Anatomy 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- 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
- F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
- F41A21/12—Cartridge chambers; Chamber liners
-
- 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
- F42B5/025—Cartridges, i.e. cases with charge and missile characterised by the dimension of the case or the missile
-
- 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
- F42B5/30—Cartridge cases of plastics, i.e. the cartridge-case tube is of plastics
- F42B5/307—Cartridge cases of plastics, i.e. the cartridge-case tube is of plastics formed by assembling several elements
Definitions
- the present invention relates in general to the field of automatic or semi-automatic firearms having a barrel having a cartridge chamber in communication with a bore and a reamer for forming a cartridge chamber.
- a typical firearm includes a barrel, a receiver, and a breech block or bolt.
- the receiver of the weapon is connected to the barrel having a cartridge chamber and the ammunition is placed into the cartridge chamber in the receiver prior to firing.
- the ammunition may be loaded into the cartridge chamber manually or automatically, via a magazine.
- the ammunition is placed in the cartridge chamber so that the bullet faces the entrance to the barrel.
- the rear end of the ammunition which houses the primer, faces the bolt or breech block which contains the firing pin and functions to close off the rear end of the ammunition so that when the ammunition is fired, the bullet is ejected from the barrel.
- the firearm cartridge for rifles and machine guns, as well as larger caliber weapons can be made in various calibers or sizes.
- the firearm cartridge is essential in determining the speed and power of the bullet once the firearm is fired.
- bullet speed and power can be affected by many factors including changing the dimensions of the cartridge which dictate the amount of propellant carried by the cartridge.
- the reliable firearm cartridge require uniformity in manufacturing (e.g., bullet seating, bullet-to-casing fit, casing strength, etc.) to produce consistent pressures within the casing during firing prior to bullet and casing separation to create uniformed ballistic performance.
- the chamber in which the firearm cartridge is placed must have uniform and consistent dimensions to produce uniformed ballistic performance.
- U.S. Pat. No. 8,011,301 entitled “Cartridge for a firearm” issued to Jimmie Sloan discloses a cartridge case for a firearm is formed to contain a .338 caliber bullet.
- the case includes a cylindrical body portion with a central aperture in the head end for receipt of a primer and a cartridge extraction groove formed around the periphery of the body portion adjacent the head end.
- a frustoconical shoulder portion tapers radially inwardly from the body portion and a generally cylindrical neck portion extends longitudinally from the shoulder portion.
- the length of the body portion is approximately 1.8813 inches and the outside diameter of the body portion at the shoulder portion is 0.5709 ⁇ 0.0059 inches.
- the length of the shoulder portion is 0.2727 inches.
- the length of the neck portion is 0.3381 inches and the outside diameter of the neck portion is 0.3669 inches.
- the case encloses a volume designed to receive an amount of propellant in a range of 82.0 grns to 97.8 grns.
- U.S. Pat. No. 9,404,719 entitled “Ammunition cartridge and chamber, and tools for making and reloading same” issued to William R. Bowers discloses a case for an ammunition cartridge including a tubular member having a central axis which includes: a head which includes, a head face which is disposed substantially perpendicular to the central axis, and an extraction groove adjacent to the head face, the extraction groove circumscribing the central axis; a body abutting the head which comprises an internal chamber, a bullet receiving end spaced from the body along the central axis, a convex curved segment abutting the body, the convex curved segment being a first circular curve having a first radius of approximately 0.0263 inches, a frustoconical segment abutting the convex curved segment, and a concave curved segment abutting the frustoconical segment, the concave curved segment being a second circular curve having a second radius of approximately 0.10
- U.S. Patent Application Publication No. 2014/0075805 entitled “Firearm barrel having cartridge chamber preparation facilitating efficient cartridge case extraction and protection against premature bolt failure” issued to Mark C. Lame discloses a barrel to permit ease and efficiency for the extraction of spent cartridge cases from the cartridge chamber of a firearm barrel within a wide range of temperature conditions, the internal tapered surface of the body region of a cartridge chamber by establishing circumferentially spaced longitudinal straight or curved regions of the internal Surface finish to create an internal cartridge chamber geometry having gradually tapered spaced longitudinally relieved linear or spiral areas having longitudinal linear or spiral lands between each of the relieved areas.
- the circumferentially spaced lands develop controlled impedance to rearward cartridge case movement on cartridge firing to effectively protect the bolt and extractor mechanisms of the firearm against early failure.
- Another object of the invention is to provide a new and improved barrel, chamber and reamer for use with a cartridge for a firearm that maximizes bullet speed, resulting in more down range energy and distance, without substantially increasing the size of the case or cartridge.
- the present invention provides a barrel of a firearm, comprising: a barrel bore being defined within said barrel; a cartridge chamber being defined within said barrel from a head face to said barrel bore, said cartridge chamber having a generally tapered internal body wall surface; a cartridge case shoulder support surface; wherein the cartridge case shoulder support surface has a shoulder taper angle of about 30 degrees; and a shoulder transition connecting the cartridge case shoulder support surface to a throat in communication with the barrel bore, wherein the shoulder transition has a radius of circular curve convex segment 138 and a radius of circular curve concave segment 140 .
- the cartridge chamber has an axial length from the head face to the neck is between 1.8 and 2.0.
- the cartridge chamber has an axial length from the head face to the neck is between 1.9.
- the cartridge chamber has an axial length from the head face to the neck is between 1.9530. In one embodiment the cartridge chamber is adapted to receive a cartridge having an axial cartridge length of 2.5-2.9. In one embodiment the cartridge chamber is adapted to receive a cartridge having an axial cartridge length of 2.6-2.81. In one embodiment the cartridge chamber is adapted to receive a cartridge having an axial cartridge length of 2.685-2.81. In one embodiment the cartridge case shoulder support surface has a cartridge case shoulder length of 0.12-0.14. In one embodiment the cartridge case shoulder support surface has a cartridge case shoulder length of 0.1305.
- the barrel further comprises a base-shoulder junction at the junction of the generally tapered internal body wall surface and the cartridge case shoulder support surface, wherein the base-shoulder junction has a diameter of between 0.4-0.5. In one embodiment the base-shoulder junction has a diameter of about 0.4630. In one embodiment the barrel further comprises a throat-shoulder junction at the junction of the cartridge case shoulder support surface and the throat, wherein the throat-shoulder junction has a diameter of between 0.30-0.33. In one embodiment the throat-shoulder junction has a diameter of about 0.318.
- FIG. 1 is a side, elevation view of a nontraditional ammunition cartridge of the present invention
- FIG. 2 depict a side, cross-sectional view of a nontraditional ammunition cartridges of FIG. 1 ;
- FIG. 3 is a perspective view of a barrel
- FIG. 4 depicts a weapon platform
- FIG. 5 is a side view of the profiles of the ammunition cartridges of FIGS. 1 and 2 ;
- FIG. 6 is a side view of the barrel showing the chamber designed to house the ammunition cartridges of FIGS. 1 and 2 ;
- FIGS. 7 a and 7 b are schematic illustrations of a reamer for use in preparation of a chamber to use the ammunition cartridges of FIGS. 1 and 2 .
- the polymeric ammunition cartridges used in the cartridge chamber of the present invention are of a caliber typically carried by soldiers in combat for use in their combat weapons and common in the sporting field.
- the present invention is not limited to the described caliber and is believed to be applicable to other calibers as well.
- the chamber can be sized and dimensioned to receive any of the calibers listed above.
- the ammunition and ammunition cartridge as well as the nose and base used to assemble the ammunition and the cartridge have the specific 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 match with the corresponding cartridge chamber.
- 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 nonstandardized size, shape and dimensions of the ammunition results from the nose having a nonstandardized size and shape to the shoulder of the nose and to the nonstandardized size of the neck.
- FIG. 1 illustrates an ammunition cartridge 10 having a nonstandardized size, shape and dimensions resulting from the nose 12 having a nonstandardized size and shape to the shoulder 14 of the nose and to the nonstandardized size of the neck 16 and a cartridge body 18 .
- neck is defined as the opening at the top of the cartridge where the projectile sits.
- the neck is a cylindrical portion above the shoulder that supports the projectile and the opening in which the projectile is placed is referenced as the case mouth.
- the shoulder transitions into the case mouth.
- neck and case mouth define the same region in the instant cartridge and may be used interchangeably herein.
- FIG. 2 depicts a side, cross-sectional view of a polymeric cartridge 10 having a nonstandardized size, shape and dimensions resulting from the nose 12 having a nonstandardized size and shape to the shoulder 14 of the nose and to the nonstandardized size of the neck 16 .
- a polymeric cartridge 10 suitable for use with high velocity rifles is shown manufactured with a nose 12 and a cartridge body 18 forming a powder chamber 20 .
- the nose 12 includes a projectile aperture 22 that is in communication with a neck 16 that is in communication with a shoulder 14 that extends to a body coupler 24 .
- the body coupler 24 mates to the body 18 a nose joint 26 .
- the body coupler 24 may have various configurations including lap joints half lap joints and overlapping joints.
- the illustrated joint includes a relative flat surface 30 that mates to the nose coupler 28 at the top of the cartridge body 18 .
- a lip 32 is positioned in communication with the flat surface 30 to contact the cartridge body 18 .
- the flat surface 30 may be sloped, angled or having an alignment aid that mates a corresponding feature on the cartridge body 18 to locate and align the nose 12 .
- the cartridge body 18 extends a side wall 34 from the nose joint 26 toward a base end 36 .
- a projectile (not shown) may be inserted into the projectile aperture 22 .
- the polymeric cartridge 10 has a substantially cylindrical open-ended polymeric nose 12 extending from the projectile aperture 22 rearward to body coupler 24 .
- Body coupler 24 is shown as an overlapping joint but may also be configured as a male element in alternate embodiments of the invention.
- the nose 12 has a shoulder 14 forming chamber neck 16 .
- the nose 12 typically has a wall thickness that is thickened to accept and contact the projectile.
- the cartridge body 38 is connected to the nose 12 at the nose joint 26 by mating the body coupler 24 to the nose coupling element 40 of the cartridge body 38 .
- the cartridge body 38 extends to and overmolds a primer insert 42 to complete the bottom of the polymeric cartridge 10 .
- the primer insert 42 includes a coupling element 44 extending from an insert bottom surface 46 that is opposite an insert top surface 48 . When contacted the polymer overmolding interlocks with the coupling element 44 , through the coupling element 44 that extends with a taper to a smaller diameter at the tip 56 to form a physical interlock between the primer insert 42 and the side wall 34 .
- Located in the insert top surface 48 is a primer recess 50 that extends toward the insert bottom surface 46 .
- a primer flash hole 52 is located in the primer recess 50 and extends through the insert bottom surface 46 into the powder chamber 20 .
- the coupling element 44 extends the polymer through the primer flash aperture 52 to form a primer flash hole 54 while retaining a passage from the insert top surface 48 through the bottom surface 46 and into the powder chamber 20 to provide support and protection about the primer flash hole 54 .
- a groove 56 is positioned around the primer flash aperture 52 in the primer recess 50 to accept the polymer overmolding once it extends through the primer flash aperture 52 to form a primer flash hole 54 .
- the primer insert 42 also has an extraction flange 58 positioned about the insert top surface 48 at the bottom of the polymeric cartridge 10 .
- the primer insert 42 includes the primer recess 50 formed in the insert top surface 48 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 54 communicates through the insert bottom surface 46 of the primer insert 42 into the powder chamber 20 so that upon detonation of primer (not shown) the powder in powder chamber 20 will be ignited.
- the nose 12 , the side wall 34 and primer insert 42 define the interior of powder chamber 20 in which the powder charge (not shown) is contained.
- the interior volume of powder chamber 20 may be varied to provide the volume necessary for complete or partial filling of the powder chamber 20 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.
- Projectile (not shown) is held in place within projectile aperture 22 by an interference fit. Mechanical crimping of the projectile aperture 22 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 20 .
- Projectile (not shown) can also be injection molded directly onto the projectile aperture 22 or may be secured by 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 nose 12 and 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 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 projectile (not shown) is inserted into the projectile aperture 22 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 barrel 60 may include a breech end 62 and a muzzle end 64 .
- the breech end 62 may include a breech (i.e., a chamber opening) 66 and a surrounding breech face 68 .
- Areas of the barrel 164 adjacent to muzzle end 64 may be threaded 70 for receiving a flash hider, compensator, suppressor, or other suitable tactical accessory or part.
- the radial dimension of the barrel's exterior surface 72 may vary along the length of the barrel, the barrel's exterior surface may have generally constant radial dimension.
- Spaced from the breech end may be a circumferential ring 74 that may be formed integrally with the barrel.
- the circumferential ring 74 may be a locking ring that may be used to secure the barrel 60 to an upper receiver of the firearm.
- FIG. 4 depicts a weapon platform 76 that is configured for 6.8 mm ammunition.
- the barrel 60 of the AR-15/M4 weapon platform may be chambered for the ammunition cartridge of FIGS. 1 and 2 .
- the barrel 60 may be configured for straight blowback operation.
- the weapon platform 76 may be capable of semi-automatic and full automatic modes.
- FIG. 5 is a side view of the profiles of the ammunition cartridges of FIGS. 1 and 2 .
- the ammunition cartridge chamber that utilizes the polymeric cartridge 100 of FIGS. 1 and 2 may have nominal dimensions intended to establish a standard cartridge type. Variations from the nominal dimensions may be tolerated by limited amounts. For example, diameters in FIG. 5 may have a tolerance of between +0.020 and ⁇ 0.020 inch which means each and every value from +0.020 to ⁇ 0.020, except as otherwise noted. Below are an exemplary set of nominal dimensions and tolerances for the standard cartridge type of FIGS. 1 and 2 .
- the polymeric cartridge 10 has an Extraction groove thickness 102 (L eg ) of 0.065 ⁇ 0.020 and an Overall Rim thickness 104 (L RMT ) of 0.054 ⁇ 0.020 with a Rim thickness 106 (L RM ) 0.410 ⁇ 0.020.
- the Rim diameter 108 (D RIM ) is 0.473 ⁇ 0.020 and the diameter of the Head Face/Extraction groove 110 (D HF/EG ) is 0.405 ⁇ 0.020.
- the length from the extractor the head face to the body 112 (L HFB ) is 0.200 ⁇ 0.020.
- the polymeric cartridge 100 has a Base diameter 114 (D B ) of 0.4705 ⁇ 0.020 and a nose joint diameter 116 (D NJ ) of 0.4636+0.020 with a Cartridge Body Length 118 (L CB ) of 1.500 ⁇ 0.020 from the 0.200 from the head face to the Nose Joint.
- the polymeric cartridge 100 has an axial length from head face to base-shoulder junction 120 (L HBSJ ) of 1.8225 ⁇ 0.020 and a base-shoulder junction diameter 122 (D BSJ ) of 0.4630 ⁇ 0.020.
- the polymeric cartridge 100 has an axial length from head face to mid-shoulder 124 (L HMS ) of 1.8840 ⁇ 0.020 and a diameter at the mid-shoulder 126 (D ms ) of 0.392 ⁇ 0.020.
- the polymeric cartridge 100 has an axial length from head face to shoulder-neck junction 128 (L HSNJ ) of 1.9530 ⁇ 0.020.
- As the polymeric cartridge 100 has a shoulder-neck junction diameter 130 (D SNJ ) of 0.318 ⁇ 0.020.
- the axial length from head face to shoulder-neck junction 128 (L HSNJ ) is the same as the case length 134 (L CL ) of 1.9530 ⁇ 0.020.
- the total cartridge length 136 (L TC ) is between 2.685 and 2.810 ⁇ 0.20.
- the polymeric cartridge 100 has a radius of circular curve, convex segment 138 (round)(R 1 ) of 0.140 ⁇ 0.020 and a radius of circular curve, concave segment 140 (fillet)(R 2 ) of 0.006 ⁇ 0.020.
- the polymeric cartridge 100 has a shoulder taper angle 142 ( ⁇ 1 ) of 30° ⁇ 3 and a head taper angle 144 ( ⁇ 2 ) of 36° ⁇ 6.
- the ammunition cartridge 100 of FIGS. 1 and 2 may have nominal dimensions intended to establish a standard cartridge type and these cartridge dimensions will dictate the chamber dimensions defined in the barrel.
- the chamber in the barrel will have dimensions that are slightly larger than the dimensions of the ammunition cartridge to accommodate the ammunition cartridge 100 .
- the dimensions of the chamber may be 1, 2, 3, 4, 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 percent more than the nominal dimensions of the ammunition cartridge.
- the barrel 60 may include a breech face 200 , a breech 202 that provides access to the chamber 204 that extends to a bore 206 .
- the chamber 204 may be configured and dimensioned in accordance with FIG. 5 , and thus may include a profile that comprises a body segment 208 , a shoulder segment 210 , a neck segment 212 , a throat segment 214 , a free bore segment 213 and a lead in segment 216 including grooves (not shown).
- the barrel 60 may include an optional tapered feed section (not shown) disposed between the breech face 200 and the body segment 208 of the chamber 204 .
- the feed section may facilitate loading of ammunition cartridges into the chamber due to the increased diameter of the feed section (not shown) at the breech 202 .
- the barrel 60 includes a breech face 200 that extends to a chamber 208 which has a chamber diameter 0.200 from the bolt face 218 (D NBF ) of 0.4718 ⁇ 0.020 and a chamber diameter near the shoulder 220 (D NS ) of 0.4636 ⁇ 0.020.
- the diameter at the body shoulder junction 221 (D BSJ ) is 0.4629 ⁇ 0.020 with the diameter at the shoulder mid-point 222 (D SM ) 0.392 ⁇ 0.020 and the diameter at the shoulder neck junction 224 (D SNJ ) is 0.3169 ⁇ 0.020.
- the diameter at the throat neck junction 223 a (D TNJ ) is 0.2896 ⁇ 0.020 and the diameter at the throat free-bore junction 223 b (D TFJ ) is 0.2778 ⁇ 0.020 and the diameter at the free-bore lead-in junction 223 c (D FLJ ) is 0.2778 ⁇ 0.020.
- the bore diameter 225 (D B ) is 0.270 ⁇ 0.020 and the groove diameter 226 (D BG ) is 0.277 ⁇ 0.020.
- the chamber 208 has a case length 227 (LNBFss) from the 0.20 from the breech face 200 to the body shoulder junction of 1.500 ⁇ 0.020.
- the chamber 208 has a case length 228 (L BSJ ) from the breech face 200 to the body shoulder junction of 1.8229 ⁇ 0.020 and a mid shoulder length 230 (L BMS ) from the breech face 200 to the mid-shoulder of between 1.884 to 1.894 ⁇ 0.020 with a length from the breech face 200 to the shoulder neck junction 232 (L BSNJ ) of 1.9490 ⁇ 0.020.
- the chamber 208 has a case length 229 (L BTFJ ) from the breech face 200 to the throat free-bore junction is 2.066 ⁇ 0.020.
- the chamber 208 has a case length 231 (L BFLJ ) from the breech face 200 to free-bore lead-in junction is 2.206 ⁇ 0.020.
- the chamber 208 has a case length 233 (L BSJ ) from the breech face 200 to lead-in bore junction is 2.355 ⁇ 0.020.
- the chamber 208 has a Radius of concave circular curve 234 (R 1 ) of 0.140+0.030 and a Radius of convex circular curve 236 (R 2 ) of 0.014 to 0.08+0.020.
- the chamber 208 has a shoulder taper angle 238 ( ⁇ 1 ) of 30° ⁇ 3.
- the body segment 208 may be shorter in length than disclosed, the diameter D BSJ at the base-shoulder junction may be positioned at the same distance L BSJ from the breech face 200 .
- the chamber 204 may have the same headspace dimensions (i.e., Axial length from breech face 200 to shoulder neck junction L BSNJ and diameter at the shoulder neck junction D SNJ ) and shoulder geometry as disclosed in FIG. 5 .
- the neck segment 212 and throat segment 214 may be configured and dimensioned as necessary.
- FIGS. 7 a and 7 b are schematic illustrations of a reamer for use in preparation of a chamber to use the ammunition cartridges of FIGS. 1 and 2 .
- the reamer 300 is illustrated that is specifically designed to ream or form a firearm chamber compatible with cartridge illustrated in FIGS. 1 and 2 .
- the values listed in FIG. 7 may be 10% larger or 10% smaller allow for tolerances.
- the dimensions listed may also be ⁇ 0.02. It will be noted that the chamber has dimensions slightly larger than an unfired in FIGS. 1 and 2 . When cartridge is fired in the chamber formed with reamers 300 the fired dimensions set forth above are achieved.
- the reamer 300 may be configured and dimensioned to form the chamber illustrated in FIG. 6 .
- the reamer 300 has a chamber diameter at the chamber's bolt face end 318 (D NBF ) of 0.4718 ⁇ 0.020.
- the reamer 300 has a diameter at the body shoulder junction 321 (D BSJ ) is 0.4625 ⁇ 0.020 with the diameter at the shoulder mid-point 322 (D SM ) 0.392 ⁇ 0.020 and the diameter at the shoulder neck junction 324 (D SNJ ) is 0.3169 ⁇ 0.020.
- the diameter at the throat free-bore junction 323 b (D TFJ ) is 0.2778 ⁇ 0.020 and the diameter at the free-bore lead-in junction 323 c (D FLJ ) is 0.2690 ⁇ 0.020.
- the reamer 300 has a case length 328 (L BSJ ) from the breech face region to the body shoulder junction of 1.8229 ⁇ 0.020 and a mid shoulder length 330 (L BMS ) from the breech face region to the mid-shoulder of between 1.887 to 1.884 ⁇ 0.020 with a length from the breech face region to the shoulder neck junction 332 (L BSNJ ) of 1.9490 ⁇ 0.020.
- the reamer 300 has a case length 329 (L BTFJ ) from the breech face region to the throat free-bore junction is 2.021 ⁇ 0.020.
- the reamer 300 has a case length 331 (L BFLJ ) from the breech face region to free-bore lead-in junction is 2.189 ⁇ 0.020.
- the reamer 300 has a case length 333 (L BSJ ) from the breech face region to lead-in bore junction is 2.2272 ⁇ 0.020.
- the reamer 300 has a Radius of concave circular curve 334 (R 1 ) of 0.140+0.030 and a Radius of convex circular curve 236 a (R 2 ) of 0.010+0.020. Radius of circular curve 236 b of 0.020+0.020.
- the reamer 300 has a shoulder taper angle 238 ( ⁇ 1 ) of 30° ⁇ 3.
- 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.
- A, B, C, or combinations thereof refers to all permutations and combinations of the listed items preceding the term.
- “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.
- expressly included are combinations that contain repeats of one or more item or term, such as BB, AAA, MB, BBC, AAABCCCC, CBBAAA, CABABB, and so forth.
- BB BB
- AAA AAA
- MB BBC
- AAABCCCCCC CBBAAA
- CABABB CABABB
- compositions and/or methods disclosed and claimed herein can be made and executed without undue experimentation in light of the present disclosure. While the compositions and methods of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations may be applied to the compositions and/or methods and in the steps or in the sequence of steps of the method described herein without departing from the concept, spirit and scope of the invention. All such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and concept of the invention as defined by the appended claims.
Abstract
Description
- The present invention relates in general to the field of automatic or semi-automatic firearms having a barrel having a cartridge chamber in communication with a bore and a reamer for forming a cartridge chamber.
- None.
- None.
- Without limiting the scope of the invention, its background is described in connection with cartridge casing, ammunition, a reamer for forming a firing chamber and the chamber in the firearm to receive the ammunition.
- A typical firearm includes a barrel, a receiver, and a breech block or bolt. The receiver of the weapon is connected to the barrel having a cartridge chamber and the ammunition is placed into the cartridge chamber in the receiver prior to firing. The ammunition may be loaded into the cartridge chamber manually or automatically, via a magazine. The ammunition is placed in the cartridge chamber so that the bullet faces the entrance to the barrel. The rear end of the ammunition, which houses the primer, faces the bolt or breech block which contains the firing pin and functions to close off the rear end of the ammunition so that when the ammunition is fired, the bullet is ejected from the barrel.
- The firearm cartridge for rifles and machine guns, as well as larger caliber weapons, can be made in various calibers or sizes. The firearm cartridge is essential in determining the speed and power of the bullet once the firearm is fired. Generally, bullet speed and power can be affected by many factors including changing the dimensions of the cartridge which dictate the amount of propellant carried by the cartridge. The reliable firearm cartridge require uniformity in manufacturing (e.g., bullet seating, bullet-to-casing fit, casing strength, etc.) to produce consistent pressures within the casing during firing prior to bullet and casing separation to create uniformed ballistic performance. In addition, the chamber in which the firearm cartridge is placed must have uniform and consistent dimensions to produce uniformed ballistic performance.
- For example, U.S. Pat. No. 8,011,301 entitled “Cartridge for a firearm” issued to Jimmie Sloan discloses a cartridge case for a firearm is formed to contain a .338 caliber bullet. The case includes a cylindrical body portion with a central aperture in the head end for receipt of a primer and a cartridge extraction groove formed around the periphery of the body portion adjacent the head end. A frustoconical shoulder portion tapers radially inwardly from the body portion and a generally cylindrical neck portion extends longitudinally from the shoulder portion. The length of the body portion is approximately 1.8813 inches and the outside diameter of the body portion at the shoulder portion is 0.5709±0.0059 inches. The length of the shoulder portion is 0.2727 inches. The length of the neck portion is 0.3381 inches and the outside diameter of the neck portion is 0.3669 inches. The case encloses a volume designed to receive an amount of propellant in a range of 82.0 grns to 97.8 grns.
- For example, U.S. Pat. No. 9,404,719 entitled “Ammunition cartridge and chamber, and tools for making and reloading same” issued to William R. Bowers discloses a case for an ammunition cartridge including a tubular member having a central axis which includes: a head which includes, a head face which is disposed substantially perpendicular to the central axis, and an extraction groove adjacent to the head face, the extraction groove circumscribing the central axis; a body abutting the head which comprises an internal chamber, a bullet receiving end spaced from the body along the central axis, a convex curved segment abutting the body, the convex curved segment being a first circular curve having a first radius of approximately 0.0263 inches, a frustoconical segment abutting the convex curved segment, and a concave curved segment abutting the frustoconical segment, the concave curved segment being a second circular curve having a second radius of approximately 0.1049 inches. The entire contents of each of which are incorporated herein by reference.
- For example, U.S. Patent Application Publication No. 2014/0075805 entitled “Firearm barrel having cartridge chamber preparation facilitating efficient cartridge case extraction and protection against premature bolt failure” issued to Mark C. Lame discloses a barrel to permit ease and efficiency for the extraction of spent cartridge cases from the cartridge chamber of a firearm barrel within a wide range of temperature conditions, the internal tapered surface of the body region of a cartridge chamber by establishing circumferentially spaced longitudinal straight or curved regions of the internal Surface finish to create an internal cartridge chamber geometry having gradually tapered spaced longitudinally relieved linear or spiral areas having longitudinal linear or spiral lands between each of the relieved areas. The circumferentially spaced lands develop controlled impedance to rearward cartridge case movement on cartridge firing to effectively protect the bolt and extractor mechanisms of the firearm against early failure.
- Accordingly, it is an object of the present invention to provide a new and improved barrel, chamber and reamer to form the chamber for use with a new and improved cartridge for a firearm.
- Another object of the invention is to provide a new and improved barrel, chamber and reamer for use with a cartridge for a firearm that maximizes bullet speed, resulting in more down range energy and distance, without substantially increasing the size of the case or cartridge.
- The present invention provides a barrel of a firearm, comprising: a barrel bore being defined within said barrel; a cartridge chamber being defined within said barrel from a head face to said barrel bore, said cartridge chamber having a generally tapered internal body wall surface; a cartridge case shoulder support surface; wherein the cartridge case shoulder support surface has a shoulder taper angle of about 30 degrees; and a shoulder transition connecting the cartridge case shoulder support surface to a throat in communication with the barrel bore, wherein the shoulder transition has a radius of circular curve convex
segment 138 and a radius of circular curveconcave segment 140. In one embodiment the cartridge chamber has an axial length from the head face to the neck is between 1.8 and 2.0. In one embodiment the cartridge chamber has an axial length from the head face to the neck is between 1.9. In one embodiment the cartridge chamber has an axial length from the head face to the neck is between 1.9530. In one embodiment the cartridge chamber is adapted to receive a cartridge having an axial cartridge length of 2.5-2.9. In one embodiment the cartridge chamber is adapted to receive a cartridge having an axial cartridge length of 2.6-2.81. In one embodiment the cartridge chamber is adapted to receive a cartridge having an axial cartridge length of 2.685-2.81. In one embodiment the cartridge case shoulder support surface has a cartridge case shoulder length of 0.12-0.14. In one embodiment the cartridge case shoulder support surface has a cartridge case shoulder length of 0.1305. In one embodiment the barrel further comprises a base-shoulder junction at the junction of the generally tapered internal body wall surface and the cartridge case shoulder support surface, wherein the base-shoulder junction has a diameter of between 0.4-0.5. In one embodiment the base-shoulder junction has a diameter of about 0.4630. In one embodiment the barrel further comprises a throat-shoulder junction at the junction of the cartridge case shoulder support surface and the throat, wherein the throat-shoulder junction has a diameter of between 0.30-0.33. In one embodiment the throat-shoulder junction has a diameter of about 0.318. - 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:
-
FIG. 1 is a side, elevation view of a nontraditional ammunition cartridge of the present invention; -
FIG. 2 depict a side, cross-sectional view of a nontraditional ammunition cartridges ofFIG. 1 ; -
FIG. 3 is a perspective view of a barrel; -
FIG. 4 depicts a weapon platform; -
FIG. 5 is a side view of the profiles of the ammunition cartridges ofFIGS. 1 and 2 ; -
FIG. 6 is a side view of the barrel showing the chamber designed to house the ammunition cartridges ofFIGS. 1 and 2 ; and -
FIGS. 7 a and 7 b are schematic illustrations of a reamer for use in preparation of a chamber to use the ammunition cartridges ofFIGS. 1 and 2 . - It is to be noted however, that the appended drawings illustrate only a typical embodiment of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
- 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.
- The polymeric ammunition cartridges used in the cartridge chamber of the present invention are of a caliber typically carried by soldiers in combat for use in their combat weapons and common in the sporting field. 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, .17 caliber, .22 caliber, .243 caliber, .257 caliber, .270 caliber, .277 caliber, .30 caliber, .303 caliber, .308 caliber, .338 caliber, .357 caliber, .38 caliber, .375 caliber, .40 caliber, .416 caliber, .43 caliber, .44 caliber, .45 caliber, .475 caliber, and .50 caliber ammunition, cases, cartridges and components of ammunition, cases, cartridges. The chamber can be sized and dimensioned to receive any of the calibers listed above. The ammunition and ammunition cartridge as well as the nose and base used to assemble the ammunition and the cartridge have the specific 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 match with the corresponding cartridge chamber. 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. In one embodiment the nonstandardized size, shape and dimensions of the ammunition results from the nose having a nonstandardized size and shape to the shoulder of the nose and to the nonstandardized size of the neck.
-
FIG. 1 illustrates anammunition cartridge 10 having a nonstandardized size, shape and dimensions resulting from thenose 12 having a nonstandardized size and shape to theshoulder 14 of the nose and to the nonstandardized size of theneck 16 and acartridge body 18. As used herein the term neck is defined as the opening at the top of the cartridge where the projectile sits. In a traditional cartridge the neck is a cylindrical portion above the shoulder that supports the projectile and the opening in which the projectile is placed is referenced as the case mouth. As the instant cartridge does not have a traditional neck the shoulder transitions into the case mouth. The term neck and case mouth define the same region in the instant cartridge and may be used interchangeably herein. -
FIG. 2 depicts a side, cross-sectional view of apolymeric cartridge 10 having a nonstandardized size, shape and dimensions resulting from thenose 12 having a nonstandardized size and shape to theshoulder 14 of the nose and to the nonstandardized size of theneck 16. Apolymeric cartridge 10 suitable for use with high velocity rifles is shown manufactured with anose 12 and acartridge body 18 forming a powder chamber 20. Thenose 12 includes aprojectile aperture 22 that is in communication with aneck 16 that is in communication with ashoulder 14 that extends to abody coupler 24. Thebody coupler 24 mates to the body 18 a nose joint 26. Thebody coupler 24 may have various configurations including lap joints half lap joints and overlapping joints. The illustrated joint includes a relativeflat surface 30 that mates to the nose coupler 28 at the top of thecartridge body 18. Alip 32 is positioned in communication with theflat surface 30 to contact thecartridge body 18. - In other embodiments the
flat surface 30 may be sloped, angled or having an alignment aid that mates a corresponding feature on thecartridge body 18 to locate and align thenose 12. Thecartridge body 18 extends aside wall 34 from the nose joint 26 toward abase end 36. A projectile (not shown) may be inserted into theprojectile aperture 22. Thepolymeric cartridge 10 has a substantially cylindrical open-endedpolymeric nose 12 extending from theprojectile aperture 22 rearward tobody coupler 24.Body coupler 24 is shown as an overlapping joint but may also be configured as a male element in alternate embodiments of the invention. Thenose 12 has ashoulder 14 formingchamber neck 16. Thenose 12 typically has a wall thickness that is thickened to accept and contact the projectile. Thecartridge body 38 is connected to thenose 12 at the nose joint 26 by mating thebody coupler 24 to the nose coupling element 40 of thecartridge body 38. - The
cartridge body 38 extends to and overmolds aprimer insert 42 to complete the bottom of thepolymeric cartridge 10. Theprimer insert 42 includes a coupling element 44 extending from aninsert bottom surface 46 that is opposite aninsert top surface 48. When contacted the polymer overmolding interlocks with the coupling element 44, through the coupling element 44 that extends with a taper to a smaller diameter at thetip 56 to form a physical interlock between theprimer insert 42 and theside wall 34. Located in the inserttop surface 48 is a primer recess 50 that extends toward theinsert bottom surface 46. A primer flash hole 52 is located in the primer recess 50 and extends through theinsert bottom surface 46 into the powder chamber 20. The coupling element 44 extends the polymer through the primer flash aperture 52 to form aprimer flash hole 54 while retaining a passage from the inserttop surface 48 through thebottom surface 46 and into the powder chamber 20 to provide support and protection about theprimer flash hole 54. Agroove 56 is positioned around the primer flash aperture 52 in the primer recess 50 to accept the polymer overmolding once it extends through the primer flash aperture 52 to form aprimer flash hole 54. Theprimer insert 42 also has anextraction flange 58 positioned about the inserttop surface 48 at the bottom of thepolymeric cartridge 10. Theprimer insert 42 includes the primer recess 50 formed in the inserttop surface 48 for ease of insertion of the primer (not shown). Theprimer recess 38 is sized so as to receive the primer (not shown) in an interference fit during assembly. Aprimer flash hole 54 communicates through theinsert bottom surface 46 of theprimer insert 42 into the powder chamber 20 so that upon detonation of primer (not shown) the powder in powder chamber 20 will be ignited. - The
nose 12, theside wall 34 and primer insert 42 define the interior of powder chamber 20 in which the powder charge (not shown) is contained. The interior volume of powder chamber 20 may be varied to provide the volume necessary for complete or partial filling of the powder chamber 20 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. - Projectile (not shown) is held in place within
projectile aperture 22 by an interference fit. Mechanical crimping of theprojectile aperture 22 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 20. Projectile (not shown) can also be injection molded directly onto theprojectile aperture 22 or may be secured by 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
nose 12 and 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 projectile (not shown) is inserted into theprojectile aperture 22 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. - Referring to
FIG. 3 , thebarrel 60 may include abreech end 62 and amuzzle end 64. Thebreech end 62 may include a breech (i.e., a chamber opening) 66 and a surroundingbreech face 68. Areas of the barrel 164 adjacent to muzzleend 64 may be threaded 70 for receiving a flash hider, compensator, suppressor, or other suitable tactical accessory or part. Although, the radial dimension of the barrel'sexterior surface 72 may vary along the length of the barrel, the barrel's exterior surface may have generally constant radial dimension. Spaced from the breech end, however, may be acircumferential ring 74 that may be formed integrally with the barrel. Thecircumferential ring 74 may be a locking ring that may be used to secure thebarrel 60 to an upper receiver of the firearm. -
FIG. 4 depicts aweapon platform 76 that is configured for 6.8 mm ammunition. Thebarrel 60 of the AR-15/M4 weapon platform, however, may be chambered for the ammunition cartridge ofFIGS. 1 and 2 . Thebarrel 60 may be configured for straight blowback operation. Theweapon platform 76 may be capable of semi-automatic and full automatic modes. -
FIG. 5 is a side view of the profiles of the ammunition cartridges ofFIGS. 1 and 2 . The ammunition cartridge chamber that utilizes thepolymeric cartridge 100 ofFIGS. 1 and 2 may have nominal dimensions intended to establish a standard cartridge type. Variations from the nominal dimensions may be tolerated by limited amounts. For example, diameters inFIG. 5 may have a tolerance of between +0.020 and −0.020 inch which means each and every value from +0.020 to −0.020, except as otherwise noted. Below are an exemplary set of nominal dimensions and tolerances for the standard cartridge type ofFIGS. 1 and 2 . Thepolymeric cartridge 10 has an Extraction groove thickness 102 (Leg) of 0.065±0.020 and an Overall Rim thickness 104 (LRMT) of 0.054±0.020 with a Rim thickness 106 (LRM) 0.410±0.020. The Rim diameter 108 (DRIM) is 0.473±0.020 and the diameter of the Head Face/Extraction groove 110 (DHF/EG) is 0.405±0.020. The length from the extractor the head face to the body 112 (LHFB) is 0.200±0.020. Thepolymeric cartridge 100 has a Base diameter 114 (DB) of 0.4705±0.020 and a nose joint diameter 116 (DNJ) of 0.4636+0.020 with a Cartridge Body Length 118 (LCB) of 1.500±0.020 from the 0.200 from the head face to the Nose Joint. Thepolymeric cartridge 100 has an axial length from head face to base-shoulder junction 120 (LHBSJ) of 1.8225±0.020 and a base-shoulder junction diameter 122 (DBSJ) of 0.4630±0.020. Thepolymeric cartridge 100 has an axial length from head face to mid-shoulder 124 (LHMS) of 1.8840±0.020 and a diameter at the mid-shoulder 126 (Dms) of 0.392±0.020. Thepolymeric cartridge 100 has an axial length from head face to shoulder-neck junction 128 (LHSNJ) of 1.9530±0.020. As thepolymeric cartridge 100 has a shoulder-neck junction diameter 130 (DSNJ) of 0.318±0.020. The axial length from head face to shoulder-neck junction 128 (LHSNJ) is the same as the case length 134 (LCL) of 1.9530±0.020. The total cartridge length 136 (LTC) is between 2.685 and 2.810±0.20. Thepolymeric cartridge 100 has a radius of circular curve, convex segment 138 (round)(R1) of 0.140±0.020 and a radius of circular curve, concave segment 140 (fillet)(R2) of 0.006±0.020. Thepolymeric cartridge 100 has a shoulder taper angle 142 (α1) of 30°±3 and a head taper angle 144 (α2) of 36°±6. - The
ammunition cartridge 100 ofFIGS. 1 and 2 may have nominal dimensions intended to establish a standard cartridge type and these cartridge dimensions will dictate the chamber dimensions defined in the barrel. As a result, the chamber in the barrel will have dimensions that are slightly larger than the dimensions of the ammunition cartridge to accommodate theammunition cartridge 100. Thus the dimensions of the chamber may be 1, 2, 3, 4, 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 percent more than the nominal dimensions of the ammunition cartridge. -
Nominal Dimensions for Exemplary Cartridge Description Dimension Tolerance ± Extraction groove thickness 102 LEG 0.065 0.020 Overall rim thickness, 104 LRMT 0.054 0.020 Rim thickness 106 LRM 0.410 0.020 Rim diameter 108 DRIM 0.473 0.020 Axial length from head face to extraction groove 110 DHF/EG 0.405 0.020 Axial length from the head face to the body 112 LHFB 0.200 0.020 Diameter at the base 114 DB 0.4705 0.020 Diameter of the cartridge body 116 Dcb 0.4636 0.020 Axial length from of the cartridge body 118 LCB 1.500 0.020 Axial length from the head face to the shoulder 120 LHBSJ 1.8225 0.200 Diameter at the base-shoulder junction 122 DBSJ 0.4630 0.020 Axial length from the head face to the mid-shoulder 124 LHMS 1.884 0.020 Diameter at the mid-shoulder 126 Dms 0.392 0.020 Axial length from the head face to the neck 128 LHSNJ 1.9530 0.020 Diameter at the shoulder-neck junction 130 DSNJ 0.318 0.020 Axial case length 134 LCL 1.9530 0.020 Axial cartridge length 136 LTC 2.685-2.81 0.200 Radius of circular curve, convex segment (round) 138 R1 0.140 0.020 Radius of circular curve, concave segment (fillet) 140 R2 0.006 0.020 Shoulder taper angle 142 α 130° 3 Head taper angle 144 α 236° 6 - Referring to
FIG. 6 , thebarrel 60 may include abreech face 200, a breech 202 that provides access to thechamber 204 that extends to abore 206. Thechamber 204 may be configured and dimensioned in accordance withFIG. 5 , and thus may include a profile that comprises abody segment 208, ashoulder segment 210, aneck segment 212, athroat segment 214, afree bore segment 213 and a lead insegment 216 including grooves (not shown). Thebarrel 60, however, may include an optional tapered feed section (not shown) disposed between thebreech face 200 and thebody segment 208 of thechamber 204. The feed section (not shown) may facilitate loading of ammunition cartridges into the chamber due to the increased diameter of the feed section (not shown) at the breech 202. Thebarrel 60 includes abreech face 200 that extends to achamber 208 which has a chamber diameter 0.200 from the bolt face 218 (DNBF) of 0.4718±0.020 and a chamber diameter near the shoulder 220 (DNS) of 0.4636±0.020. In thechamber 208, the diameter at the body shoulder junction 221 (DBSJ) is 0.4629±0.020 with the diameter at the shoulder mid-point 222 (DSM) 0.392±0.020 and the diameter at the shoulder neck junction 224 (DSNJ) is 0.3169±0.020. The diameter at thethroat neck junction 223 a (DTNJ) is 0.2896±0.020 and the diameter at the throat free-bore junction 223 b (DTFJ) is 0.2778±0.020 and the diameter at the free-bore lead-injunction 223 c (DFLJ) is 0.2778±0.020. The bore diameter 225 (DB) is 0.270±0.020 and the groove diameter 226 (DBG) is 0.277±0.020. - The
chamber 208 has a case length 227 (LNBFss) from the 0.20 from thebreech face 200 to the body shoulder junction of 1.500±0.020. Thechamber 208 has a case length 228 (LBSJ) from thebreech face 200 to the body shoulder junction of 1.8229±0.020 and a mid shoulder length 230 (LBMS) from thebreech face 200 to the mid-shoulder of between 1.884 to 1.894±0.020 with a length from thebreech face 200 to the shoulder neck junction 232 (LBSNJ) of 1.9490±0.020. Thechamber 208 has a case length 229 (LBTFJ) from thebreech face 200 to the throat free-bore junction is 2.066±0.020. Thechamber 208 has a case length 231 (LBFLJ) from thebreech face 200 to free-bore lead-in junction is 2.206±0.020. Thechamber 208 has a case length 233 (LBSJ) from thebreech face 200 to lead-in bore junction is 2.355±0.020. Thechamber 208 has a Radius of concave circular curve 234 (R1) of 0.140+0.030 and a Radius of convex circular curve 236 (R2) of 0.014 to 0.08+0.020. Thechamber 208 has a shoulder taper angle 238 (α1) of 30°±3. -
Nominal Dimensions for Exemplary Cartridge Chamber Description Dimension Tolerance ± Chamber diameter near the breech face 218 DNBF 0.4718 0.020 Chamber diameter near the shoulder 220 DNS 0.4636 0.020 Chamber diameter at the body shoulder junction 221 DBSJ 0.4629 0.020 Chamber diameter at the shoulder mid-point 222 DSM 0.3920 0.020 Chamber diameter at the shoulder neck junction 224 DSNJ 0.3169 0.020 Chamber diameter at the throat neck junction 223a DTNJ 0.2896 0.020 Chamber diameter at the throat free bore junction 223b DTFJ 0.2778 0.020 Chamber diameter at the free bore lead injunction 223c DFLJ 0.2778 0.020 Chamber diameter of the bore 225 DB 0.2700 0.020 Diameter of the groove 226 DBG 0.2770 0.020 Axial length from near breech face to the body shoulder junction 227 LNBFSJ 0.1500 0.020 Axial length from breech face to body-shoulder junction 228 LBSJ 1.8229 0.020 Axial length from breech face to mid-shoulder 230 LBMS 1.884-1.894 0.020 Axial length from breech face to the throat free-bore junction 229 LBTFJ 2.066 Axial length from breech face to free-bore lead-in junction 231 LBFLJ 2.206 Axial length from breech face to lead-in bore junction 233 LBSJ 2.355 Axial length from breech face to shoulder neck junction 232 LBSNJ 1.9490 0.020 Radius of circular curve, convex segment (round) 234 R1 0.140 0.020 Radius of circular curve, concave segment (fillet) 236 R2 0.014-0.008 0.020 Radius of circular curve, convex segment (round) 234 R3 0.005 0.020 Shoulder taper angle 238 α1 30° 3 - Although the
body segment 208 may be shorter in length than disclosed, the diameter DBSJ at the base-shoulder junction may be positioned at the same distance LBSJ from thebreech face 200. Similarly, thechamber 204 may have the same headspace dimensions (i.e., Axial length frombreech face 200 to shoulder neck junction LBSNJ and diameter at the shoulder neck junction DSNJ) and shoulder geometry as disclosed inFIG. 5 . Additionally, theneck segment 212 andthroat segment 214 may be configured and dimensioned as necessary. -
FIGS. 7 a and 7 b are schematic illustrations of a reamer for use in preparation of a chamber to use the ammunition cartridges ofFIGS. 1 and 2 . Thereamer 300 is illustrated that is specifically designed to ream or form a firearm chamber compatible with cartridge illustrated inFIGS. 1 and 2 . The values listed inFIG. 7 may be 10% larger or 10% smaller allow for tolerances. The dimensions listed may also be ±0.02. It will be noted that the chamber has dimensions slightly larger than an unfired inFIGS. 1 and 2 . When cartridge is fired in the chamber formed withreamers 300 the fired dimensions set forth above are achieved. -
Nominal Dimensions for Exemplary Chamber Reamer Description Dimension Tolerance ± Reamer diameter near the breech face 318 DNBF 0.4718 0.020 Reamer diameter at the body shoulder junction 321 DBSJ 0.4625 0.020 Reamer diameter at the shoulder mid-point 322 DSM 0.3920 0.020 Reamer diameter at the shoulder neck junction 324 DSNJ 0.3169 0.020 Reamer diameter at the throat free bore junction 323b DTFJ 0.2778 0.020 Reamer diameter at the free bore lead in junction 323c DFLJ 0.2690 0.020 Axial length from breech face to body-shoulder junction 328 LBSJ 1.8229 0.020 Axial length from breech face to mid-shoulder 330 LBMS 1.887-1.884 0.020 Axial length from breech face to the throat free-bore junction 329 LBTFJ 2.021 0.020 Axial length from breech face to free-bore lead-in junction 331 LBFLJ 2.189 0.020 Axial length from breech face to lead-in bore junction 333 LBSJ 2.2272 0.020 Axial length from breech face to shoulder neck junction 332 LBSNJ 1.9490 0.020 Radius of circular curve, convex segment (round) 334 R1 0.140 0.020 Radius of circular curve, concave segment (fillet) 336a R2 0.014-0.008 0.020 Radius of circular curve, concave segment (fillet) 336b R3 0.020-0.005 0.020 Shoulder taper angle 338 α1 30° 3 - The
reamer 300 may be configured and dimensioned to form the chamber illustrated inFIG. 6 . Thereamer 300 has a chamber diameter at the chamber's bolt face end 318 (DNBF) of 0.4718±0.020. Thereamer 300 has a diameter at the body shoulder junction 321 (DBSJ) is 0.4625±0.020 with the diameter at the shoulder mid-point 322 (DSM) 0.392±0.020 and the diameter at the shoulder neck junction 324 (DSNJ) is 0.3169±0.020. The diameter at the throat free-bore junction 323 b (DTFJ) is 0.2778±0.020 and the diameter at the free-bore lead-injunction 323 c (DFLJ) is 0.2690±0.020. - The
reamer 300 has a case length 328 (LBSJ) from the breech face region to the body shoulder junction of 1.8229±0.020 and a mid shoulder length 330 (LBMS) from the breech face region to the mid-shoulder of between 1.887 to 1.884±0.020 with a length from the breech face region to the shoulder neck junction 332 (LBSNJ) of 1.9490±0.020. Thereamer 300 has a case length 329 (LBTFJ) from the breech face region to the throat free-bore junction is 2.021±0.020. Thereamer 300 has a case length 331 (LBFLJ) from the breech face region to free-bore lead-in junction is 2.189±0.020. Thereamer 300 has a case length 333 (LBSJ) from the breech face region to lead-in bore junction is 2.2272±0.020. Thereamer 300 has a Radius of concave circular curve 334 (R1) of 0.140+0.030 and a Radius of convex circular curve 236 a (R2) of 0.010+0.020. Radius of circular curve 236 b of 0.020+0.020. Thereamer 300 has a shoulder taper angle 238 (α1) of 30°±3. - 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.
- All publications and patent applications mentioned in the specification are indicative of the level of skill of those skilled in the art to which this invention pertains. All publications and patent applications are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference.
- 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, MB, 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.
- All of the compositions and/or methods disclosed and claimed herein can be made and executed without undue experimentation in light of the present disclosure. While the compositions and methods of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations may be applied to the compositions and/or methods and in the steps or in the sequence of steps of the method described herein without departing from the concept, spirit and scope of the invention. All such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and concept of the invention as defined by the appended claims.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/524,143 US20230143951A1 (en) | 2021-11-11 | 2021-11-11 | Firearm barrel having a cartridge chamber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/524,143 US20230143951A1 (en) | 2021-11-11 | 2021-11-11 | Firearm barrel having a cartridge chamber |
Publications (1)
Publication Number | Publication Date |
---|---|
US20230143951A1 true US20230143951A1 (en) | 2023-05-11 |
Family
ID=86229932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/524,143 Pending US20230143951A1 (en) | 2021-11-11 | 2021-11-11 | Firearm barrel having a cartridge chamber |
Country Status (1)
Country | Link |
---|---|
US (1) | US20230143951A1 (en) |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040237827A1 (en) * | 2000-09-28 | 2004-12-02 | Smalley Robert B. | Firearm cartridge and case-less chamber |
US7210260B1 (en) * | 2000-09-28 | 2007-05-01 | Robert B. Smalley, Jr. | Firearm cartridge and case-less chamber |
US20110214583A1 (en) * | 2008-07-16 | 2011-09-08 | Kenneth Dutch | Improved Firearm Cartridges and Delivery System |
US20120024183A1 (en) * | 2010-07-30 | 2012-02-02 | Mnp Corporation | Cartridge Base and Plastic Cartridge Case Assembly for Ammunition Cartridge |
US20120180687A1 (en) * | 2011-01-14 | 2012-07-19 | Pcp Ammunition Company Llc | High strength polymer-based cartridge casing for blank and subsonic ammunition |
US20120180688A1 (en) * | 2011-01-14 | 2012-07-19 | Pcp Ammunition Company Llc | High strength polymer-based cartridge casing and manufacturing method |
US20130014664A1 (en) * | 2011-01-14 | 2013-01-17 | PCP Ammunition Company, LLC | Narrowing high strength polymer-based cartridge casing for blank and subsonic ammunition |
US20140060372A1 (en) * | 2011-01-14 | 2014-03-06 | Pcp Tactical, Llc | Variable inside shoulder polymer cartridge |
WO2014062256A2 (en) * | 2012-07-13 | 2014-04-24 | Pcp Tactical, Llc | Narrowing high strength polymer-based cartridge casing for blank and subsonic ammunition |
US20150241183A1 (en) * | 2011-01-14 | 2015-08-27 | Pcp Tactical, Llc | Overmolded high strength polymer-based cartridge casing for blank and subsonic ammunition |
US20160091288A1 (en) * | 2013-05-15 | 2016-03-31 | Etat Français Represente Par Le Delegue General Pour L'armement | Neckless cartridge |
US20180245891A1 (en) * | 2011-01-14 | 2018-08-30 | Pcp Tactical Llc | Polymer-based cartridge casing for blank and subsonic ammunition |
-
2021
- 2021-11-11 US US17/524,143 patent/US20230143951A1/en active Pending
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040237827A1 (en) * | 2000-09-28 | 2004-12-02 | Smalley Robert B. | Firearm cartridge and case-less chamber |
US7210260B1 (en) * | 2000-09-28 | 2007-05-01 | Robert B. Smalley, Jr. | Firearm cartridge and case-less chamber |
US20110214583A1 (en) * | 2008-07-16 | 2011-09-08 | Kenneth Dutch | Improved Firearm Cartridges and Delivery System |
US20120024183A1 (en) * | 2010-07-30 | 2012-02-02 | Mnp Corporation | Cartridge Base and Plastic Cartridge Case Assembly for Ammunition Cartridge |
US20120180687A1 (en) * | 2011-01-14 | 2012-07-19 | Pcp Ammunition Company Llc | High strength polymer-based cartridge casing for blank and subsonic ammunition |
US20120180688A1 (en) * | 2011-01-14 | 2012-07-19 | Pcp Ammunition Company Llc | High strength polymer-based cartridge casing and manufacturing method |
US20130014664A1 (en) * | 2011-01-14 | 2013-01-17 | PCP Ammunition Company, LLC | Narrowing high strength polymer-based cartridge casing for blank and subsonic ammunition |
US20140060372A1 (en) * | 2011-01-14 | 2014-03-06 | Pcp Tactical, Llc | Variable inside shoulder polymer cartridge |
US20150241183A1 (en) * | 2011-01-14 | 2015-08-27 | Pcp Tactical, Llc | Overmolded high strength polymer-based cartridge casing for blank and subsonic ammunition |
US20180245891A1 (en) * | 2011-01-14 | 2018-08-30 | Pcp Tactical Llc | Polymer-based cartridge casing for blank and subsonic ammunition |
WO2014062256A2 (en) * | 2012-07-13 | 2014-04-24 | Pcp Tactical, Llc | Narrowing high strength polymer-based cartridge casing for blank and subsonic ammunition |
US20160091288A1 (en) * | 2013-05-15 | 2016-03-31 | Etat Français Represente Par Le Delegue General Pour L'armement | Neckless cartridge |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10782107B1 (en) | Lightweight cartridge case and weapon system | |
US20210364258A1 (en) | Method of Forming a Chamber for Polymer Ammunition | |
US11300388B2 (en) | Advanced modular ammunition and cartridges and systems | |
US9329003B2 (en) | Muzzleloader systems | |
US10030956B2 (en) | Muzzleloader systems | |
US11047660B2 (en) | Muzzleloader systems | |
US11846485B2 (en) | Rifles and muzzle loading rifles receiving propellant charge with an extended primer cap in a bolt action configuration, and method of loading | |
US5171934A (en) | Shortened shotshell with double-cupped wadding | |
US7526888B1 (en) | Breach plug for muzzleloading rifle | |
US11187509B2 (en) | Bullet and casing projectile for rifled barrel | |
US20230142727A1 (en) | Method of making a firearm barrel | |
US6367389B1 (en) | Cartridge for a firearm | |
US11668549B2 (en) | Muzzleloader systems | |
US20230143951A1 (en) | Firearm barrel having a cartridge chamber | |
US20230147902A1 (en) | Firearm barrel reamer having a cartridge chamber | |
US7444942B2 (en) | Saboted projectile with external ridges and/or internal locking edge for muzzleloading firearms | |
US9939223B1 (en) | Pistol with short barrel and deep groove rifling | |
US11340039B2 (en) | Cartridge breech plug for inline muzzle loading firearm | |
US11656063B2 (en) | Reduced-energy cartridge with exterior sealing member for fluted chamber | |
US20230384070A1 (en) | Firearm ammunition component and method of use | |
RU2259535C1 (en) | Fixed ammunition | |
KR20240022498A (en) | Ammunition casing with steps within deep shell grooves | |
CA2828683C (en) | Muzzleloader systems | |
GB2044896A (en) | Round of ammunition; air guns |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TRUE VELOCITY IP HOLDINGS, LLC, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BURROW, LONNIE;OVERTON, CHRISTOPHER WILLIAM;OVERTON, KENNETH J.;SIGNING DATES FROM 20211119 TO 20211123;REEL/FRAME:058693/0355 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: ADVISORY ACTION MAILED |