The present invention relates to a method of manufacturing ammunition for firing from the barrel of a weapon, and in particular, but not exclusively, firearm ammunition.
A common firearm ball type ammunition, as opposed to shotgun ammunition, comprises a metallic cartridge case containing a volume of propellant, with a primer fixed in a base of the case and a bullet or projectile releasable pressed into an opposite end of the case. When this type of ammunition is in use, a firing pin impacts on the primer which in turn produces a flame to initiate deflagration of the propellant. As the propellant deflagrates inside the case, it produces large volumes of gas which ejects the bullet of projectile from the case, propelling the bullet through the barrel of the weapon from which the ammunition is fired.
The manufacturing process for this type of ammunition is well known and relatively straight forward. Typically, the cases are formed by a stamping or drawing process. A primer is loaded into the base of the cartridge, the cartridge filled with propellant, and the bullet or projectile which is usually made by a casting process pressed into the cartridge.
the present invention proposes a different manufacturing process and produces a different type of ammunition.
In the claims of this application and in the description of the invention, except where the context requires otherwise due to express language or necessary implication, the words “comprise” or variations such as “comprises” or “comprising” are used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
According to one aspect of the present invention there is provided a method of manufacturing ammunition for firing from a barrel of a weapon the method comprising:
The method may further comprise sealing the opposite end with a seal. The seal may comprise a primer.
The method may further comprise forming a seat in the cavity for seating the seal. In one embodiment, forming the seat may comprise configuring one or both of the core and the mould in a manner to produce a seat void into which the liquefied material flows to form, upon solidification, the seat. In this embodiment the seat void is circular in shape to produce a circular seat or land. In an alternate embodiment, the core may be provided with a plurality of elongated grooves which create rib voids in the cavity, into which the liquefied material flows to form, upon solidification, corresponding ribs along the inside of the cavity. In this embodiment, the seat is formed by ends of the ribs nearest the opposite end.
However in yet a further embodiment the method of forming the seat may comprise placing an insert into the mould, the insert having an open end disposed inside the cavity and inboard of the opposite end, the open end forming a lip inside of the cavity, the lip constituting the seat.
The placing of the insert into the mould may comprise forming an insert, placing the insert on the core, and inserting the core into the mould, wherein, the insert is retained in the projectile body when the core is removed from the projectile body.
The method may further comprise forming a core with a plug and a spigot extending axially from the plug. In this embodiment, the grooves may be formed along the spigot. The forming of the mould may comprise forming the mould from at least two separate parts which can be brought together to produce the casting void, and moved apart to facilitate removal of the projectile body from the mould.
The forming of the mould may further comprise forming the mould with open opposite first and second ends and wherein the placing of the core in the mould comprises inserting the core into the mould from the first end, and introducing the liquefied material comprising pouring the material into the mould from the second end.
One embodiment of the method may further comprise forming one or more circumferential grooves in the interior surface of the mould into which the liquefiable material flows, to form, upon solidification one or more corresponding circumferential flanges about an outside surface of the projectile body. When the projectile is in use, the or each flange engages rifling, and may act as a seal against an inner surface of a barrel of a weapon from which the ammunition is fired. More particularly in one embodiment the method may comprise configuring the mould so that a maximum diameter D1 of body is less than a bore diameter Db of the barrel. In addition, the circumferential grooves may be formed of a depth so that the corresponding flanges have an outer diameter Db<D2≦Dg(1+≦Δ) where 0.05≧Δ≧0 and where Dg is a groove diameter of the barrel.
In an alternate embodiment, the mould may be provided with a circumferential ridge about its interior surface which, upon solidification of the liquefiable material, forms a corresponding circumferential groove about the projectile body. This embodiment further comprises the step of engaging a sealing ring in the circumferential groove. In use, the sealing ring can form a seal against an inner circumferential surface of a barrel of a weapon from which the ammunition is fired. In a variation to this embodiment, the circumferential ridge may be one of a plurality of ridges each forming a circumferential groove about the projectile body.
Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which:
a is a side elevation of a left half of a mould used in an embodiment of the present method of manufacturing a projectile;
b is a front elevation view of the left hand mould shown in
c is a front elevation view of a right half of the mould;
d is a side elevation of the right half of the mould shown in
a is a side elevation view of a core incorporated in an embodiment of the method;
b is an end elevation view of the core shown in
a is a side elevation of a core incorporated in a further embodiment of the method;
b is an end elevation view of the core shown in
a is a schematic representation of a core and insert that may be used in a further embodiment of the method;
b is a partial section view of a round of ammunition manufactured using the core and insert shown in
Embodiments of the present method facilitate the manufacture of ammunition of the type described in Applicant's co-pending international publication no. WO 2005/095884. An embodiment of a round of ammunition 10 is depicted in
a-2 depict an embodiment of a mould 32 incorporated in the present method for manufacturing the ammunition 10.
The interior surface 40 is in a general configuration complimentary to the exterior shape of the projectile body 12. In order to form the cavity 18 in the projectile body 12 a core 42 (see
In the illustrated embodiment, the interior surface 40 of the mould 32 is formed with two circumferential grooves, formed by semicircular grooves 44a and 44b and the other by semicircular grooves 46a and 46b. Semicircular grooves 44a and 44b in the mould portions 34a and 34b together form one of the circumferential grooves in the interior surface 40 while the semicircular grooves 46a and 46b in the mould portions 34a and 34b when brought together form a second circumferential groove in the interior surface 40. A liquefied solidifiable material such as molten lead is poured into the mould 32 and flows into the casting void 43, including the grooves, to form the body 12 and circumferential flanges, which act as seals 30a and 30b extending about the projectile body 12 shown in
The mould portion 34a is formed with a pair of semicircular dimples 48 which are diametrically opposed about the recess 36a. The mould portion 34b is formed with a pair of hemispherical recesses 50 diametrically opposed about the recess 36b. The dimples 48 and recesses 50 are relatively located so as to register with each other when the portions 34 are brought together to form the mould 32. Channels 52 are formed in a side of the portions 34 opposite the surfaces 38a, 38b for seating a spring or clamp to hold the portions 34 together while the molten lead is poured into the mould 32.
As is apparent from
a and 3b depict an embodiment of the core 42 comprising a plug 62 and a spigot 64 extending coaxially from the plug 62. The plug 62 has a base 65 of a configuration so as to seat in the increased diameter part 60 and abut against circumferential and radial surfaces of the part 60. The plug 62 further includes a reduced diameter portion 66 that is dimensioned to extend into and abut against a corresponding length of an inner circumferential wall of the part 58 of each recess 36. The base 65 and reduced diameter portion 66 in effect seal the open end 54 of the mould 32. This substantially closes the end 54 to prevent or substantially minimise leakage of molten lead.
Extending from the portion 66 is a further step wise reduced diameter portion 68. The spigot 64 extends coaxially with the portion 68 and has a slightly smaller diameter. The difference in the diameter between the portion 68 and the spigot 64 forms the seat 29 in the projectile body 12 (see
To facilitate easy removal of the core 42 from the projectile body 12 the spigot 64 is provided with a slight taper so as to reduce in outer diameter in a direction away from the plug 62. A blind hole 69 is formed in the base 65 coaxial with the spigot 64. The hole 69 receives a tool to assist in gripping and thus extracting the core 42 from the body 12.
A typical sequence of events in the manufacture of the projectile 10 is as follows:
However in a minor variation the core could be removed after opening the mould to remove the body, ie step (3) could be performed before step (4).
a and 4b depict an alternate form of the core, denoted herein as core 42′ that may be used in an alternate embodiment of the present method. The core 42′ is identical with the core 42 with the exception of the inclusion of three elongate and evenly spaced grooves 70 that extend along the length of the spigot 64. The grooves 70 create rib voids in the casting cavity 43 into which molten lead flows to form, upon solidification, corresponding integrally formed ribs 72 (shown in phantom in
a and 5b depict a variation in the method by which an insert or sleeve 80 in the form of a cylindrical tube having a closed end 82 is moulded into the ammunition 10. The insert 80 is carried by a modified core 42″. The core 42″ differs from the core 42 by omission of the reduced diameter part 68 so that the spigot 64 extends directly from the reduced diameter portion 66. The core 42″ with the insert 80 carried on the spigot 64 is inserted into the mould 32. After the molten lead has solidified, and the core 42″ is extracted leaving the insert 80 inside the body 12 as depicted in
An advantage of using the insert 80 is that it may be made from a stronger material than that used for the body 12, for example high tensile steel) providing greater strength to the body 12 for the purposes of confining deflagrating propellant. In particular, the sleeve will minimise radial expansion of the body 12 to reduce the likelihood of the outer surface of the body 12 contacting the rifling in a barrel after commencement of deflagration. The mould 32 may be configured to have an inner diameter D1, corresponding to a maximum outer diameter of the body 12, which is less than or equal to a bore diameter of a weapon from which the ammunition 10 is to be fired, and an inner diameter D2, corresponding to the outer diameter of the seals 30a, 30b, between a minimum which is at least greater than the bore diameter and a maximum which is greater than a groove diameter of the weapon. Thus, for example, if the bore diameter is signified as Db and the groove diameter as Dg, then D1≦Db and Db<D2≦Dg(1+Δ) where 0.05≧Δ≧0. In this way, prior to firing the ammunition 10, the ammunition 10 will have a body 12 of a maximum diameter less than or at most equal to the bore diameter, and seals 30a, 30b will have a diameter that will engage the rifling and also engage the groove diameter of the weapon. When the seals 30a, 30b engage the groove diameter and the rifling, a seal is formed which substantially eliminates the escape of high pressure gas past the ammunition 10. Indeed in a further embodiment the seals may have different diameters to each other. For example, the seal 30b may have a diameter equal to the groove diameter Dg with the rear seal 30a having a diameter equal to or marginally less than a breach diameter. In this way the real seal 30a will centrally position the ammunition with respect to a central axis of the barrel.
In embodiments where the insert 80 is incorporated in the method of manufacturing, after firing of the ammunition 10, the insert 80 may confine radial expansion of the ammunition 10 as it travels along the barrel of the weapon to the extent that D1 is always less than the bore diameter so that the outer surface of the body does not have any substantive contact with the rifling. This minimises drag in the barrel and maximises thrust produced by the propellant.
In the above discussion the term “bore diameter” is intended to define the internal diameter of a barrel measured from the tops of diametrically opposed lands forming the rifling, ie the smallest internal diameter. If the lands are not opposed, then the bore diameter is the diameter of a circle inscribed to touch the top of the lands. The bore diameter is the inside diameter of the barrel before the rifling is cut. The term “groove diameter” is intended to define the diametrical measurement of the bore of a rifled barrel, measured from the bottom of opposing grooves (ie the largest internal diameter). If the grooves are not opposed, the groove diameter is deemed to be the diameter of a circle inscribed to touch the bottoms of the grooves. Now that embodiments of the invention have been described in detail it will be apparent to those skilled in the relevant arts that numerous modifications and variations may be made without departing from the basic inventive concepts. For example, the method described depicts the manufacture of a mould 32 having a single casting cavity 40. However a mould 32 may be formed with any number of cavities so as to form multiple projectile bodies 12 from a single mould. Alternately, a plurality of separate moulds 32 each having a single casting cavity 40 may be cast simultaneously to again form multiple projectile bodies 12 in a single casting step.
All such modifications and variations together with others that would be obvious to a person of ordinary skill in the art are deemed to be within the scope of the present invention the nature of which is to be determined from the above description and the appended claims.
Number | Date | Country | Kind |
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2007901728 | Mar 2007 | AU | national |
This is a continuation-in-part of U.S. Ser. No. 10/557,321, filed Nov. 18, 2005, now U.S. Pat. No. 7,448,325 which was the National Stage of International Application No. PCT/AU05/00473, filed Mar. 31, 2005.
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Number | Date | Country | |
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Parent | 10557321 | US | |
Child | 12079775 | US |