CARTRIDGE WITH IMPROVED PENETRATION AND EXPANSION BULLET

Abstract

A cartridge with a steel component bullet has desirable penetration capabilities and controlled separation of components upon terminal impact. In embodiments of the invention, the cartridge comprises a steel component, a lead core, and a copper jacket. The lead jacket having a leading edge portion that extends to the cylindrical mid portion. The steel component bullet may have a forward pointed ogive portion, a cylindrical mid portion, and a tapered rearward portion. The rearwardly facing surface may be concave. The leading edge portion may have a taper oriented in a direction opposite the taper of the ogive portion of the steel component. Structure to inhibit spin is positioned on a rearward face of the steel component. The bullet having a concave rear face.

Claims

1. A pistol cartridge comprising a cartridge casing with an open mouth and an interior, propellant disposed in the interior of the cartridge casing, and a bullet secured in the mouth of the cartridge casing, the bullet having a length and comprising: a forward component made of a first metal comprising steel, the forward component having forward ogive portion with a forward tip, a cylindrical mid portion adjoining the forward ogive portion, and a rearward portion adjoining the cylindrical mid portion opposite the forward ogive portion, the rearward portion with a rear end corner, the cylindrical mid portion diametrically larger than the forward ogive portion, the rearward portion having a maximum diameter portion positioned adjacent the rear end corner, the rearward portion having a curved taper extending from the maximum diameter portion to the cylindrical mid portion, the maximum diameter portion extending less than 15% of the length of the bullet and having a diameter greater than the diameter of the cylindrical mid portion; a jacket formed of a second metal comprising copper and defining a cup, the steel component seated in the cup, the jacket having a leading edge portion positioned at the cylindrical mid portion of the forward component; and a lead core disposed in the jacket rearward of and in direct contact with the forward component.

2. (canceled)

3. The pistol cartridge of claim 1, wherein the jacket has a leading edge that is separated from the cylindrical mid portion of the forward component defining a recess between the leading edge portion and the cylindrical mid portion.

4. The pistol cartridge of claim 1 wherein the leading edge portion and the cylindrical mid portion define a forward facing annular recess that facilitates opening of the jacket upon impact with a target.

5. The pistol cartridge of claim 1 wherein a rearward facing end surface of the forward component has structural features thereon that are reflected in a forward facing surface of the lead core inhibiting rotation of the forward component with respect to the lead core.

6. The pistol cartridge of claim 1, wherein the bullet has a rearward facing concavity formed in the jacket facing the propellant.

7. A pistol cartridge comprising a cartridge casing with open mouth and an interior, propellant in the interior of the cartridge casing, and a bullet secured in the mouth of the cartridge casing, the bullet comprising: a steel component made of a steel, the steel component having a forward ogived portion with a forward tip, a cylindrical mid portion, and a rearward portion, the cylindrical mid portion diametrically larger than the forward ogived portion, the rearward portion diametrically larger than the cylindrical portion, the rearward portion having a curved forward taper; a jacket formed of copper and defining a cup, the steel component seated in the cup, the jacket having a forward edge portion extending to the cylindrical mid portion of the steel component, wherein the forward edge portion of the jacket defines a V-shape groove with an acute angle directed forwardly.

8. The pistol cartridge of claim 7, wherein the bullet further comprises: a lead core portion in the jacket rearward of the steel component.

9. The pistol cartridge of claim 7 wherein the rearward portion has a rear end corner and then a cylindrical end portion at the rear end corner, and then a tapered portion extending forwardly from the cylindrical end portion to the cylindrical mid portion.

10. The pistol cartridge of claim 9 wherein the bullet has a concavity at a rearward facing end of the jacket.

11. The pistol cartridge of claim 7 wherein the cylindrical mid portion has a plurality of divots arranged circumferentially around the cylindrical mid portion.

12. The pistol cartridge of claim 11 wherein each of the divots extends into the forward ogive portion.

13. (canceled)

14. The pistol cartridge of claim 11 wherein each of the divots extends radially inward of forward leading edge of the jacket.

15-17. (canceled)

18. The pistol cartridge of claim 7 wherein the steel component has a rearward facing surface and said surface has a locking feature thereon to rotationally secure the steel component to the core.

19-37. (canceled)

38. A pistol cartridge comprising a cartridge casing with a forward mouth and an interior, propellant disposed in the interior of the cartridge casing, and a bullet secured in the mouth of the cartridge casing, the bullet having a length and comprising: a forward component made of a first metal comprising steel, the forward component having forward ogive portion with a forward tip, a cylindrical mid portion adjoining the forward ogive portion, and a rearward portion adjoining the cylindrical mid portion opposite the forward ogive portion, the rearward portion with a rear end corner, the cylindrical mid portion diametrically larger than the forward ogive portion, the rearward portion having a maximum diameter portion positioned adjacent the rear end corner, the rearward portion having a curved taper extending from the maximum diameter portion to the cylindrical mid portion, the maximum diameter portion extending less than 15% of the length of the bullet and having a diameter greater than the diameter of the cylindrical mid portion; a lead core rearwardly of the forward component; and a jacket formed of a second metal comprising copper and defining a cup, the steel component and lead core seated in the cup, the jacket having a rearwardly facing concavity.

39. The pistol cartridge of claim 38 wherein the rearward portion has a rear end corner and then a cylindrical end portion at the rear end corner, the maximum diameter portion being at the cylindrical end portion.

40. The pistol cartridge of claim 38, wherein the jacket has a leading edge portion that engages the cylindrical mid portion and that is separated from the cylindrical mid portion of the forward component defining a recess between the leading edge portion and the cylindrical mid portion that facilitates the opening of the jacket upon impact with a target.

41. The pistol cartridge of claim 38 wherein a rearward facing end surface of the forward component has structural features thereon that are reflected in a forward facing surface of the lead core inhibiting rotation of the forward component with respect to the lead core.

42. The pistol cartridge of claim 38 wherein the component has an axial length and the cylindrical mid portion has an axial length that is 4 to 20 percent of the axial length of the component.

43. The pistol cartridge of claim 39 wherein the component has an axial length and the rearward portion has an axial length that is 35 to 55 percent of the axial length of the component.

44. The pistol cartridge of claim 40 wherein the component has an axial length and the forward ogive portion has an axial length that is 30 to 50 percent of the axial length of the component.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0014] FIG. 1A is a front elevational view of a cartridge according to embodiments of the invention.

[0015] FIG. 1B is a front perspective view of a cartridge according to embodiments of the invention.

[0016] FIG. 1C is a front elevational view of the cartridge of FIG. 2.

[0017] FIG. 2 is a cross-sectional view of the cartridge of FIG. 1.

[0018] FIG. 3 is an exploded view of the cartridge of FIGS. 1 and 2.

[0019] FIG. 4A is an exploded view of components of a bullet prior to assembly according to an embodiment of the invention.

[0020] FIG. 4B is an exploded view of components of a bullet prior to assembly according to an embodiment of the invention.

[0021] FIG. 5A is a perspective view of a bullet according to embodiments of the invention.

[0022] FIG. 5B is a front elevational view of a bullet according to embodiments of the invention.

[0023] FIG. 5C is a perspective view of a bullet according to embodiments of the invention.

[0024] FIG. 6A is a cross-sectional view of the bullet of FIG. 5A.

[0025] FIG. 6B is a cross-sectional view of the bullet of FIG. 7B.

[0026] FIG. 6C is a cross-section view of a bullet having a recess in the rearward facing end surface of the forward component.

[0027] FIG. 6D is a cross-section view of a bullet having a plurality of recesses in the rearward facing end surface of the forward component.

[0028] FIG. 6E is a cross-section view of a bullet having a plurality of projections in the rearward facing end surface of the forward component.

[0029] FIG. 7A is a perspective view of a forward component with a non-spin feature on the rearward facing end.

[0030] FIG. 7B is a perspective view of a forward component with separate ribs as the non-spin feature on the rearward facing end.

[0031] FIG. 7C is a perspective view of a forward component with a non-spin feature on the rearward facing end.

[0032] FIG. 7D is a perspective view of a forward component with a non-spin feature on the rearward facing end and a pad for accommodating a tip of an adjacent bullet during manufacturing processes.

[0033] FIG. 7E is a perspective view of a forward component with a plurality of divots providing the non-spin feature on the rearward facing end of a forward component.

[0034] FIG. 7F is a cross-sectional view of a forward component with a plurality of divots providing the non-spin feature on the rearward facing end of a forward component.

[0035] FIG. 7G is a cross-sectional view of a forward component with a plurality of divots providing the non-spin feature on the rearward facing end of a forward component.

[0036] FIG. 7H is a cross-sectional view of a forward component with a plurality of forward flutes and a plurality of divots providing the non-spin feature on the rearward facing end of a forward component.

[0037] FIG. 7I is a side elevational view of a forward component with suitable dimensions.

[0038] FIG. 8 is cross-sectional detail view of the jacket front edge engaging the cylindrical end portion of the forward component according to embodiments.

[0039] FIG. 9A is an illustration of a step in the process of manufacturing a bullet according to embodiments of the invention.

[0040] FIG. 9B is an illustration of another step in the process of manufacturing a bullet according to embodiments of the invention.

[0041] FIG. 9C is an illustration of another step in the process of manufacturing a bullet according to embodiments of the invention.

[0042] FIG. 9D is an illustration of a bullet, according to embodiments of the invention, traveling down a barrel.

[0043] FIG. 10 is a cross-sectional view of a bullet according to embodiments of the invention traveling down a rifled barrel of a handgun.

DETAILED DESCRIPTION

[0044] Referring to FIGS. 1A-2, a handgun cartridge 20, for example a 9 mm cartridge, has a bullet 22, a casing 24, propellant 30, and a primer assembly 34. The casing 24 has a rim 35 with a diameter 35.2 and a wall portion 36 having a diameter 36.2. In embodiments, the rim diameter is the same as the wall portion diameter. The bullet is comprised of a forward component 40, a core component 42, and a jacket 44. The forward component may be formed of steel but other materials are also suitable in particular embodiments. The jacket may comprise copper and the core may comprise lead. In embodiments the core can also be copper and may be unitary with the jacket. In the embodiment of FIG. 2, the bullet is illustrated with a concavity 48 in the rearward facing end 50 of the bullet and in jacket. In other embodiments, the rearward facing end of the bullet may be flat or have other shapes.

[0045] Referring to 2, 5A-6E, and 8, the jacket has a leading edge portion 51, a leading edge 52, and a reverse tapered surface 52.2 that may be a frustoconical concave surface. In embodiments, the leading edge is separated from the steel component such that a recess 53, in embodiments a V-shaped recess, in cross-section, faces forward defining a circumferential scoop. One leg of the V is directly in line with the axis 53.3 of the bullet as well as the trajectory path. The V-shaped recess promotes opening of the jacket when the bullet impacts fluidic material which then urges the jacket to open, essentially by hydraulic force. The opened jacket can release the steel component and also the lead core increasing the damage imparted to the target.

[0046] Referring to FIGS. 2-8, in embodiments, the forward component 40 has a forward ogive portion 54, a cylindrical mid portion 56 adjoining and unitary with the forward ogive portion, a rearward facing end surface 57, and a rearward portion 58 adjoining and unitary with the cylindrical mid portion 56. In embodiments, the rearward portion 58 of the forward component has a maximum diameter portion 59 rearwardly positioned on the rearward portion, the rearward portion then tapers forwardly to adjoin the cylindrical mid portion with a curved taper. In embodiments, the forward ogive portion of the forward component being contiguous, without any intermediate structure, with the mid portion, the mid portion being contiguous, without any intermediate structure, with the rearward portion. The maximum diameter portion may extend axially defining a maximum diameter cylindrical end portion 59.2. The forward component has an axial length l, and the forward ogive portion extends an axial distance of l1, the cylindrical mid portion an axial distance of l2, and the rearward portion extends an axial distance of l3. In embodiments, l1 is 30 to 50% of l. In embodiments, l2 is 5 to 20% of l. In embodiments, l3 is 35 to 55% of l. In embodiments, l1 is 35 to 45% of l. In embodiments, l2 is 10 to 15% of l. In embodiments, l3 is 40 to 50% of l. The cylindrical end portion, in embodiments, extends axially a distance l4 of less than 10% of the axial length l of the steel component. In embodiments, the maximum diameter cylindrical end portion of the forward component extends axially less than 20% of the axial length l of the steel component. In embodiments, the axial length l4 of maximum diameter cylindrical end portion of the forward component extends axially less than 30% of the axial length l of the steel component. In embodiments, the maximum diameter cylindrical end portion 59.2 of the steel component extends axially a distance l4 less than 5% of the axial length l of the steel component. Forward of the maximum diameter portion is a tapering portion 60 that leads to the cylindrical mid portion 56. In embodiments, the tapering portion 60 is a curved taper with a compound radius. As best illustrated in FIG. 7I, the tapering portion may have a first radius of curvature 60.2 with a greater radius positioned rearwardly of a second radius of curvature 60.3 having a second radius, less than the first radius, defining a curve with an increasing taper. The tapering portion 60 of the rearward portion and the cylindrical mid portion defining a radially outwardly facing recess 61.

[0047] In embodiments, the forward component is retained in the jacket forward of the lead core, the forward component having a forward ogive portion, a cylindrical mid portion adjoined to the forward ogive portion, and a rearward portion adjoined to the cylindrical mid portion, the entirety of the rearward portion diametrically larger than the cylindrical mid portion, the entirety of the cylindrical mid portion diametrically larger than the forward ogive portion,

[0048] In embodiments, the diameter of the cylindrical mid portion is 80 percent or greater of the diameter of the maximum diameter portion of the forward component. In embodiments, the diameter of the cylindrical mid portion is 85 percent or greater of the diameter of the maximum diameter portion. In embodiments, the diameter d1 of the cylindrical mid portion is 70 percent or greater of the diameter d of the maximum diameter portion. In embodiments the ratio of the length of the forward component to the diameter of the forward component is in the range of 1.65 to 1.05. In embodiments the ratio of the length of the forward component to the diameter of the forward component is in the range of 1.50 to 1.20. In embodiments the ratio of the length of the forward component to the diameter of the forward component is in the range of 1.32 to 1.40.

[0049] In embodiments, the mid portion rather than being cylindrical, may have a slight taper forwardly of, for example, 2 degrees or less, as measured from a line parallel to the axis. In such embodiments, the mid portion is conical. In embodiments the mid portion may be conical with a taper of 5 degrees or less, as measured from a line parallel to the axis. Such conical mid portions may be substituted for all embodiments described or claimed herein.

[0050] Referring to FIGS. 1B, 1C, 5B, and 5C, the jacket may have scores or skives 62 extending axially on the forward portion 63 of the jacket. In embodiments, the skives will terminate at a point before where the bullet will engage barrel rifling, before the cylindrical end portion of the bullet. The skives may be cuts extending partially or completely through the jacket, folds in the jacket, indentations in the jacket, or other weakening of the jacket axially to facilitate tearing and opening of the jacket. U.S. Pat. Nos. 6,805,057 and 6,305,292 illustrate such skives and these patents are incorporated herein by reference for all purposes.

[0051] Referring to FIGS. 4B, 5A, 5C, 6A, and 6B, an embodiment of the invention is illustrated. FIG. 4A illustrates the use of a lead ball 66 to provide the lead core and a jacket cup preform 68. The lead ball and jacket are deformed during manufacturing as discussed below. The forward component, which may be steel, has recesses or divots 70 in the cylindrical mid portion 56 and into the ogive portion 54. The recesses or divots increase the forward facing area intermediate the outer surface 74 of the jacket and the forward component thereby increasing the hydraulic force for opening the jacket. FIG. 6 illustrate the V-shaped recess and the enhanced scoop areas 77 provided by the divots and the resulting significant increase in hydraulic forces to open the jacket. Thus, embodiments of the invention include circumferentially distributed fluid scoop areas that facilitate jacket pedaling. The fluid scoop area 77 may be defined by the gap or open region between the steel component and the leading edge of the jacket.

[0052] Referring to FIGS. 6B-7H, the forward component 40.1, 40.2, 40.3, 40.4, 40.5, 40.6, and 40.7 may have rotation inhibiting features 82, 83, 84 on the rearward facing end surface 57. The rotation inhibiting features may be configured as ribs 86 and project outwardly as shown in FIGS. 7A and 7B. Alternately, the feature may be a recess 87 in the surface as illustrated by FIGS. 7C, 77E, 7F, and 7H. Projections 87.5, such as nubs, partial spheres, or other surface structure may also be utilized to lock the forward steel component, or other material component, to the core. The bullets may be axially stacked during manufacturing processes, and the central pad 88 of FIG. 7D can facilitate such stacking such that the bullets do not misalign. FIG. 6B corresponds to the ribs of FIG. 7A and FIG. 6C corresponds to segmented recess, not shown in perspective. These interface feature will inhibit or prevent the steel component 40 from rotating with respect to the core 42.

[0053] Referring to FIGS. 4A-4B, 9A-9D, steps suitable for manufacturing the bullets described herein are illustrated. A jacket preform 68 is inserted into a die 90. A lead ball 66 is inserted into the jacket. A steel forward component 40 is held by a suitable tool 92 to punch down onto the ball in the jacket deforming the ball and deforming the rearward face of the jacket. The combined steel component, lead core, and jacket 94 are then removed and inserted steel component end first into a skiving die, and then a finishing die 96 to obtain the final bullet shape. Other and additional steps may, of course, be utilized. During this process, the features on the rearward facing end surface of the steel component, as illustrated in FIGS. 7A-7C, will be readily imparted in the forward facing surface 99 of the lead core which was the lead ball before deformation. In another embodiment of the invention, this would also occur in a bullet configuration with a jacket and a copper core in the jacket rather than the lead core.

[0054] Referring to FIG. 10, a bullet according to embodiments of the invention traveling down a barrel 100 is illustrated. The concavity 48 allows the forces from the ignition of the propellant to present a radial component 106 at the rear end of the bullet that pushes against the barrel providing a radial expansion of the rear end 107 of the bullet resulting in a gas seal. Also, the maximum diameter cylindrical end portion 59.2 of the steel component 40 is minimally deformable and provides a hard ring of contact 110 with the barrel. The radial expansion at the rear end provides another ring of contact 112 is believed to minimize yaw as the bullet travels down the barrel. When viewed in cross-section, this provides four principle regions of engagement 114 of the bullet with the rifled barrel, resulting in very stable bullet trajectory traveling down the barrel and toward the target. It has been observed that performance of steel component bullets with the concavity compared to steel component bullets with a flat rearward surface provides a significant increase in bullet accuracy.

[0055] In embodiments of the invention, the lead core can weigh about 1.4 to 2.2 times the weight of the jacket. The steel component can weigh 1.3 to 2.4 times the weight of the lead core. Weight may be approximately (within 20%) of the following for a 9 mm bullet: [0056] Jacket=19.3 grains [0057] Lead Core=36.2 grains [0058] Steel Component=47.5

[0059] Referring to FIG. 7I, suitable dimensions for the forward component are provided. In embodiments, the dimensions may vary within 10% of the given dimensions. For different sized bullets and cartridges, the dimensions will vary proportionally. The bullets herein may also be formed of other materials other than those specifically.

[0060] All of the features disclosed in this specification (including the references incorporated by reference, including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.

[0061] Each feature disclosed in this specification (including references incorporated by reference, any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

[0062] The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any incorporated by reference references, any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed The above references in all sections of this application are herein incorporated by references in their entirety for all purposes.

[0063] Although specific examples have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that any arrangement calculated to achieve the same purpose could be substituted for the specific examples shown. This application is intended to cover adaptations or variations of the present subject matter. Therefore, it is intended that the invention be defined by the attached claims and their legal equivalents, as well as the following illustrative aspects. The above described aspects embodiments of the invention are merely descriptive of its principles and are not to be considered limiting. Further modifications of the invention herein disclosed will occur to those skilled in the respective arts and all such modifications are deemed to be within the scope of the invention.