GB1568545A - Ammunition cartidges and method of manufacturing same - Google Patents
Ammunition cartidges and method of manufacturing same Download PDFInfo
- Publication number
- GB1568545A GB1568545A GB6094/77A GB609477A GB1568545A GB 1568545 A GB1568545 A GB 1568545A GB 6094/77 A GB6094/77 A GB 6094/77A GB 609477 A GB609477 A GB 609477A GB 1568545 A GB1568545 A GB 1568545A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cartridge
- ammunition
- plastics
- projectile
- metal
- 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.)
- Expired
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The cartridge has a cartridge case (14), which consists at least partially of plastic, and a base insert (10) consisting of metal. The base insert, which is preferably formed from sheet metal by deep-drawing, is anchored in a plastic collar (12) and is inserted together with said collar into the lower end of the cartridge case, as a composite insert. This construction of the base insert allows a considerable cost saving to be achieved. In addition, the metal-plastic connection of the composite insert can be achieved relatively without any problems. <IMAGE>
Description
(54) IMPROVEMENTS IN OR RELATING TO AMMUNITION
CARTRIDGES AND METHOD OF MANUFACTURING SAME
(71) We, KUPAG KUNSTSTOFF- PATENT--VERWALTUNGS A.G., a body corporate organised under the laws of Switzerland, of Gartersras,e 7, Zug, Switzerland, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:: This invention relates to improvements in the ammunition art and, specifically, to ammunition cartridges of the type having a plastics cartridge case, i.e. a case that is made, at least in a predominant portion, of a synthetic polymer composition and where the lower end portion of the cartridge case is provided with a bottom insert made of a metal. The term lower end" relates to that end of the cartridge case which is opposed to the projectile bearing or projectile imitationbearing end of the cartridge.
Cartridges of this type are known and have been disclosed, for instance, in Swiss Patent 326,592. cartridges of this type are used in large quantities as blank rifle cartridges in which the head end of the cartridge case contines into the imitation shape of a plastics projectile which constitutes an integral part of the cartridge case and is furnished at its upper end with a notch or similarly formed predetermined rupture point
The use of a plastics material for ammunition cartridge cases offers considerable advantages over usual metal cases in regard to cost and production, but necessitates a bottom insert of metal which is suitable as a groove or edge for engaging the usual cartridge extractor and ejector and for receiving and holding a detonator or percussion cap.
A prior art bottom insert of this type is a generally cylindrically shaped, solid metal component having an opening for receiving the detonator cap, an external groove for interaction with the cartridge extractor, and a generally cylindrical upper end portion with its external surface grooved in the manner of a dowel for anchoring inside the wall of a plastics cartridge case. Generally, such bottom inserts are made from aluminum by machining as relatively large thicknesses of material are required in the cartridge bottom. Thus, production of conventional all-metal bottom inserts for plastics cartridges tends to be relatively costly both in view of the comparatively large mass of metal required and the costs of producing the inserts by conventional machining techniques.
Insertion of such metal inserts into a plastics cartridge case can present problems such as ruptures of the walls of the plastics cartridge case. Further problems in connection with ammunition cartridges of the type having a plastics case for blank cartridges or projectilebearing cartridges are encountered in regard to the projectile-like end portion or the con injection of the projectile and the plastics cartridge case.
Accordingly, it is the main general object of this invention to provide for improvements in connection with blank or live rifle and gun ammunition cartridges of the type having a cartridge case portion of a synthetic plastics material in which the amount of metal used for the bottom insert is reduced as is the cost of producing the cartridges.
According to the present invention there is provided an ammunition cartridge comprising a cartridge case portion of a synthetic plastics material, and a cartridge bottom insert secured in the lower end of the case portion wherein the insert comprises a single metal bottom element having a sleeve element of a synthetic plastics composition moulded thereon, the metal bottom element being an integral structure made of a sheet metal capable of being shaped by deep-drawing and having an annular flange with a diameter sufficient to form an extraction rim, a coaxial chamber for receiving and holding a detonator cap and having an apertured upper wall portion, and laterally projecting means for anchoring the metal element to the sleeve element and the sleeve element being secured in the lower end of the case portion to secure the insert thereto and having a passage placing the apertured upper wall portion of the chamber in communication with the interior of the cartridge case portion.
Preferably, said extraction rim forming annular flange is one of a pair of axially spaced annular flanges connected by a tubular portion enclosing said chamber, the chamber opening through the other annular flange to the passage in the sleeve element, and the other annular flange having a diameter less than that of the extraction rim forming annular flange and constituting at least part of said laterally projecting means.
Desirably, the sleeve element is a generally rotationally symmetrical hollow structure having a cylindrical base and a body portion, said cylindrical base bearing against the one annular flange of said pair of annular flanges and having a smaller external diameter than said one annular flange so that an outer rim portion of said one annular flange is provided for engagement with a cartridge ejector.
With advantage, the passage in the sleeve element is of frusto-conical shape.
The end portion of the cartridge case portion may be shaped as an imitation projectile having a predetermined rupture point and an axial length of not more than 25% of the total axial length of said cartridge case portion.
The inner wall of the cartridge case portion may be provided with a plurality of elongated ribs for controlling volume and packing of the charge.
An exterior wall portion of the cartridge case portion may be provided with a plurality of grooves for improved cartridge extractability from the cartridge chamber of a weapon. Preferably, the ribs and the grooves extend in a direction parallel to or helically around the longitudinal cartridge axis.
The cartridge case portion may have a proi jectile protruding therefrom from a neck r- tion formed at the end thereof remote from the lower end with a bond-control coating provided at the interface between the projectile and the neck portion. If the projectile is made of a metal, the bond-control coating is of the bond-improving type. For projectiles made of a plastics material, the bond-control coating is of the type that prevents an undesired interbonding of the plastics projectile and the plastics cartridge case. With either type of projectile a shoulder wall portion may be provided within the case portion for defining the position of the projectile.
Preferably, a plastics projectile has a lower projectile portion situated within the plastics case neck portion, the lower projectile portion having a larger diameter than the upper projectile portion that protrudes from the neck portion for improved projectile guidance upon firing without impeding introduction of the projectile-bearing cartridge into the cartridge chamber of a weapon.
The invention also provides a method of manufacturing an ammunition cartridge which comprises the steps of shaping by deepdrawing a metal sheet material to form, as a unitary structure, a metal bottom element having an annular flange having a gauge substantially equal to that of the sheet material and having a diameter sufficient to form an extraction rim, a coaxial chamber for receiving a detonator cap and having an apertured upper wall portion, and laterally projecting means for anchoring the metal element to a sleeve element of a synthetic plastics composition, moulding the sleeve element on the metal bottom element with a passage therein communicating with the apertured upper wall portion of the chamber and securing the sleeve element in the lower end of a cartridge case portion of a synthetic plastics material with the passage communicating with the interior of the cartridge case portion.
Preferably, the metal sheet material is initially in the form of a disc which is shaped by deepdrawing to form the annular flange and the coaxial chamber with the apertured upper wall portion, the chamber being defined by a tubular wall portion and in which the tubular wall portion is deformed to form a second annular flange axially spaced from and of a diameter less than the extraction rim forming annular flange, the second annular flange constituting at least a part of the laterally projecting means.
The detonator cap may be provided in the coaxial chamber before the sleeve element is secured in the cartridge case portion.
A charge may be provided in the cartridge case portion before the sleeve element is secured in the lower end of the cartridge case portion.
Embodiments of the invention will now be described by way of example, reference being made to the accompanying drawings in which: Fig. 1 is a sectional view of the lower end portion of a cartridge according to the invention,
Fig. 2 is a view similar to Fig. 1 illustrating a modification,
Fig. 3 is a sectional view illustrating a further modification,
Figs. 4a and 4b are sectional views of a cartridge case according to the invention provided with an imitation projectile prior to introduction of the bottom insert, and
Figs. 5a and Sb are sectional views of the top end portion of a cartridge with a projectile.
In Fig. 1, the lower end portion of a cartridge case 14 of a synthetic plastics material (indicated in broken lines with the central and upper cartridge case portions broken away for a simplified presentation) is closed by means of a composite cartridge bottom insert comprising a metal bottom element 10 having two coaxial spaced disc-like parts or annular flanges 101, 102 and a tubular or hollow cylinder member 104 interconnecting the flanges. Flange 101 constitutes the actual cartridge bottom, the upper rim or edge portion of which is exposed for the engagement of a conventional cartridge extractor. Flanges
101, 102 and the interconnecting tubular member 104 enclose a generally cylindrical chamber 100 for receiving and holding a conventional detonator or percussion cap, not
shown in the drawings.
Bottom element 10 is made of metal such
as a light metal or alloy, e.g. aluminum or
aluminum alloy, steel, brass or the like mat
erial capable of being shaped by deep-drawing for mass production purposes. The metal bottom element 10 is embedded or anchored
in a rotationally symmetrical plastics sleeve
element 12 which is moulded thereon and
which has a duct or passage 128 of frustoconical shape for connecting the interior or charge-bearing portion 141 of cartridge case
14 with chamber 100 of the metal bottom
insert 10 so that actuation of a detonator cap
in chamber 100 will cause ignition of a charge
provided in case 14.
Sleeve 12 is of a plastics material, preferably a thermoplastic polymer composition which
possesses a ball-pressure hardness (60 inch- ball), at ambient (15300C) temperature, of
at least about 500 kp/cm2 and a modulus
of elasticity of at least about 5 X 104 kp/cm'. Non-limiting examples of suitable thermoplastic materials include polyolefins such as polyethylene (high density type), poly propylene and the like, polyamides, polyacetals, polyesters, etc. In general, plastics of the type known to be suitable for manufacture of the cartridge case and including conventional additions such as pigments, dyes, fillers, stabilizers and the like can be used for the sleeve element of the inventive bottom insert.Duroplastics, i.e. cross-linked or thermoset polymers such as epoxy resins and the like may be used for the sleeve element, e.g.
by casting or molding a duroplastically settling composition to form the sleeve element around the metal bottom element so as to form the composite unit. Sleeve elements of thermoplastic polymer compositions can be produced and shaped by conventional thermoplastics processing methods including injection moulding, compression moulding or other shaping processes with simultaneous anchoring of the metal element, e.g. by providing the latter in the sleeve-producing mold prior to introduction of the plastics material. In general, anchoring of the metal element in the plastics sleeve will be obtained by providing projections or grooves on the outer wall of cylinder 104 and/or by flange 102.Preferably, the laterally projecting portion of flange 102 constitutes the main anchoring component of the metal element but the lower face of flange 102 mav be rounded as indicated in broken line 103. However, anchoring projections that have an analogous effect may be formed by continuous or interrupted beadings, ribs, webs or lengths of thread in the outer wall of cylinder 104.
The general shape of sleeve element 12 as illustrated in Fig. 1 is preferred but not critical as long as a sufficiently firm anchorage of metal element 10, on the one hand, and an adequate connection between the sleeve and the cartridge case 14, on the other hand, are ensured. Base portion 121 of sleeve 12 has a generally cylindrical shape, bears against the upper surface 105 of flange 101 and has a smaller outer diameter than flange 101 so as to accord with the desired depth of the extractor groove. Sleeve base 121 widens conically upwards and outwards to form abutment 126 against which the cartridge case 14 bears. A number of beadings 124 is provided at the outer sleeve wall for securing the composite insert in the wall of case 14.
The bottom insert consisting of plastics sleeve 12 and metal element 10 firmly anchored therein is used to close the lower end of case 14 and a plastics-plastics con nection is readily obtained between the plastics cartridge case and the plastics sleeve of the insert. It is surprising indeed that a major portion of the bottom insert of ammunition cartridges can be made of a plastics material without any disadvantage in regard to the suitability of such cartridge for use as blank or live ammunition even though the explosion pressure occurring upon firing of the charge acts upon the plastics sleeve of the insert rather than the metal bottom.As to the thickness of the plastics sleeve material above the metal bottom element, it is sufficient, in general, if the axial depth of aperture 128 and of the surrounding transition portion 123 is at least about as large as the axial depth of metal element 10.
Fig. 2 shows a modification, preferred from its manufacturing aspects, of the metal constituent of the composite insert. This metal element is made from a circular disc of metal sheet, capable of being deep-drawn, for example steel, aluminum or brass, generally having the external dimensions and thickness of bottom plate 27. For producing the metal element shown in Fig. 2, the disc is deepdrawn to form chamber 21 with an axial depth greater than that of the final chamber and then the chamber portion is upset to the desired axial depth while simultaneously forming the external annular beading 23. Aperture 28 in upper wall portion 24 may already be present in the disc or may be formed during upsetting or later.Plastics sleeve 22 repre
sented in a semi-diagrammatical manner for
connection with plastics case 29 can be pro
duced and shaped as explained in connection
with Fig. 1, or have a somewhat simplified
structure as shown in Fig. 2. The axial depth of abutment 226 is increased in a preferred embodiment so as to obtain an enlarged surface of direct contact between the plastics material of sleeve element 22 and the wall of the cartridge chamber of a weapon.
A modified embodiment is illustrated in
Fig. 3 which shows the lower part of plastics sleeve 32 as well as the bottom portion of a plastics cartridge case 34. The structure of the outer wall portion of sleeve 32 and the correspondingly intermeshing part of the inner wall of case 34 can be made in the manner illustrated in Fig. 1 and 2, or by any other means suitable for mutual connection. As both sleeve 32 and case 34 are made of a plastics material, various bonding methods for such connection will be apparent to the expert.
Metal element 30 is made in a manner similar to that explained in connection with
Fig. 2. An upwardly bent external rim 36 is provided having an end face 361 for interaction with the cartridge extractor and ejector mechanism of a weapon. Metal element 30 is anchored in plastics sleeve 32 in the manner explained above. The embodiment of the bottom insert shown in Fig. 3 is especially suitable for gun ammunition cartridges and provides for the use of relatively thin metal sheet materials without detracting from the strength of rim 36 required for ejection of the cartridge case after firing from a weapon.
Fig. 4a shows a longitudinal sectional view of the cartridge case for an improved blank ammunition cartridge made essentially of a plastics material only. The bottom insert which is not shown in Fig. 4a is made as explained in connection with Fig. 1 and 2.
Fig. 4b shows a cross-sectional view of the cartridge case illustrated in Fig. 4cL Cartridge case 41 has an upper end piece 42 shaped as an imitation projectile and is made of plastics material throughout. The top of end piece 42 is furnished with a notch 43 at which the wall of the casing can rupture when a charge (not shown) contained in the chamber 45 is detonated. Preferably, length KL of projectile-shaped end piece 43 is at most 23 Cof of the total length HL of the cartridge case, because this provides for savings in material and space and decreases the danger of an intentional or accidental weakening of case 41 in the transition or neck portion 47.Preferably, the inner wall surface of plastics cartridge case 41 is furnished with a number of ribs or webs 46 extending axially or helically in a continuous or interrupted manner over at least a part of the case wall. The volume of the internal charge-receiving space 45 of the case as well as the charge can be controlled in this manner, i.e. adaption to the intended charge volume and improved uni- formity of charge distribution. In addition, nbs 46 may serve to prevent agglomeration of a charge consisting of particulate explosives.
The outer wall of case 41 may be furnished with a number of troughs or grooves 46 for facilitating extraction of the case from the cartridge chamber of the weapon. Structuring of the cartridge case wall 41 as shown in
Fig. 4b offers additional advantages in regard to manufacture of the cartridge case by injection moulding of thermoplastics as a uniform filling of the injection mould is facilitated by the internally and/or externally situated ribs and grooves, respectively.
In the manufacture of cartridges for live ammunition of the type having a case made of synthetic plastics material problems can arise due to inadequate or excessive strength of the connection between the case and the projectile. These problems can be resolved according to an embodiment illustrated in
Fig. 5a representing a longitudinal sectional view of the top portion of a projectile-bearing ammunition cartridge positioned in the cartridge chamber of a weapon.
A bond control layer 55 is provided at the interface between projectile 51 and neck 53 of cartridge case 57, preferably on the projectile surface. For metal projectiles, layer 55 is made of a bond improving agent, i.e.
a composition capable of increasing adhesion between a metal surface (projectile) and a plastics surface (cartridge case) such as, for example, polymers of the type used for interbonding the metal and plastics constituents of metal-coated plastics laminates. Such polymers include polar groups and can be selected, for example, from the class of copolymers made of olefins and of unsaturated organic acids, unsaturated add esters or salts of unsaturated organic acids (ionomers).
When using projectiles made of synthetic plastics material, on the other hand, the bond control layer will be of the type that decreases plastics/plastics adhesion or interwelding so that the plastics projectile will not be bonded too strongly to the plastics cartridge wall, e.g. when producing the plastics cartridge by injection moulding with the projectile inserted into the mould.
According to a preferred modification, cartridge case 57 is provided with shoulder elements 56 formed as an integral part of the plastics cartridge case so that projectile 51 can be pushed into neck 53 of a preformed case 57 until the lower end of the projectile projects into the internal space 52 of case 57 and bears against the shoulder elements 56.
Fig. 5b further illustrates the arrangement of the shoulder elements in a cross-sectional view of the cartridge case of Fig. 5a.
According to another preferred embodiment of the projectile-bearing type ammunition cartridge having a projectile made of plastics the lower portion 512 of projectile 51 that penetrates into neck 53 and case 57 has a larger cross-sectional diameter than the upper portion 511 of projectile 51 that protrudes from the case, i.e. extends upward beyond edge 58 of neck 53. This embodiment assures that the ammunition cartridge can be inserted into the ammunition chamber of the weapon and easily removed therefrom even if not fired while, at the same time, providing for optimum projectile guidance in the barrel of the weapon upon firing.
It is to be noted that the terms "plastics casing", "plastics projectile" and "made of plastics" are not intended as a restriction to such objects as consist entirely of a plastics material. In fact, the cartridge case or case wall of any embodiment of the cartridge according to this invention may include a re inforcing inlay or layer of fibres such as
glass fibres or of sheets or foils including
reinforcing metal layers of the type known
for reinforcing plastics objects. Cartridge cases
consisting essentially of plastics compositions
that may, or may not include particulate or
fibrous fillers are generally preferred, how
ever, for reasons of economy.Cartridge cases
consisting of thermoplastic polymer com
positions can be shaped by blowmoulding techniques, or may possess a molecular orientation that provides for a more or less pronounced reinforcing effect.
The essential advantages of the novel car
tridge according to the invention can be
realised in any ammunition cartridge that has a plastics case, notably for use in blank or
live rifle ammunition. In addition to reduced
costs of materials and production, the cartridge provides functional improvements which are believed to be due to the fact that the metal/plastics connection is situated within the bottom insert rather than between the bottom insert and the cartridge case.
Preferably, the novel cartridge according to the invention is formed first by shapingly deforming by deepdrawing, of a metal sheet material, e.g., aluminium, aluminium alloy, steel, brass or the like, having a gauge substantially equal to that of the lower base portion of the metal bottom element, e.g., typi
cally in the order of 1 mm (+ 0.3 mm) for
rifle ammunition cartridges, and secondly, by
anchoringly securing the metal element in the plastics sleeve element which is formed of a suitable thermoplastics composition and moulded around the upper or anchoring portion of the metal element. Subsequently, a conventional detonator cap can be pressed into the cap-receiving and cap-holding chamber provided in the metal bottom element.
Then, the completed assembly of cartridge bottom insert plus detonator cap is introduced into the lower end of a plastics cartridge case that may have a conventional structure or be designed in accordance with one of the preferred cartridge case embodiments disclosed herein. In general, a suitable charge will be provided within the case prior to closing its lower end with the cartridge bottom. Alternatively, the charge can be introduced via the top end of the cartridge case.
According to a preferred embodiment, the metal sheet for producing the metal bottom element is provided in the form of a disc that may, or may not, have a central aperture, and the disc is deep-drawn to produce a generally tubular cylindrical protrusion which, in a subsequent shaping step is pressingly deformed so as to form a flanged or rimmed upper portion 23 as depicted in
Fig. 2. Aperture 28 may be formed in connection with this second step unless the discshaped blank used has such an aperture to start with, or produced subsequently.
WHAT WE CLAIM IS:- 1. An ammunition cartridge comprising a
cartridge case portion of a synthetic plastics
material, and a cartridge bottom insert secured
in the lower end of the case portion wherein
the insert comprises a single metal bottom
element having a sleeve element of a syn
thetic plastics composition moulded thereon,
the metal bottom element being an integral
structure made of a sheet metal capable of
being shaped by deep-drawing and having
an annular flange with a diameter sufficient
to form an extraction rim, a coaxial chamber
for receiving and holding a detonator cap and
having an apertured upper wall portion, and
laterally projecting means for anchoring the
metal element to the sleeve element and the
sleeve element being secured in the lower
end of the case portion to secure the insert
thereto and having a passage placing the
apertured upper wall portion of the chamber
in communication with the interior of the
cartridge case portion.
2. A cartridge according to Claim 1 in
which said extraction rim forming annular
flange is one of a pair of axially spaced an
nular flanges connected by a tubular portion
enclosing said chamber, the chamber opening
through the other anuular flange to the passage
in the sleeve element, and the other annular
flange having a diameter less than that of the
extraction rim forming annular flange and
constituting at least part of said laterally pro
jecting means.
3. An ammunition cartridge according to
Claim 2 suitable for use in rifles, wherein
the sleeve element is a generally rotationally
symmetrical hollow structure having a cylin
drical base and a body portion, said cylindrical
base bearing against the one annular flange
of said pair of annular flanges and having
a smaller external diameter than said one
annular flange so that an outer rim portion
of said one annular flange is provided for
engagement with a cartridge ejector.
4. An ammunition cartridge according to
Claim 1, 2 or 3 wherein the body portion
of the sleeve element comprises at least one
annular beading engaged with an inner wall
portion of the cartridge case portion.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (23)
1. An ammunition cartridge comprising a
cartridge case portion of a synthetic plastics
material, and a cartridge bottom insert secured
in the lower end of the case portion wherein
the insert comprises a single metal bottom
element having a sleeve element of a syn
thetic plastics composition moulded thereon,
the metal bottom element being an integral
structure made of a sheet metal capable of
being shaped by deep-drawing and having
an annular flange with a diameter sufficient
to form an extraction rim, a coaxial chamber
for receiving and holding a detonator cap and
having an apertured upper wall portion, and
laterally projecting means for anchoring the
metal element to the sleeve element and the
sleeve element being secured in the lower
end of the case portion to secure the insert
thereto and having a passage placing the
apertured upper wall portion of the chamber
in communication with the interior of the
cartridge case portion.
2. A cartridge according to Claim 1 in
which said extraction rim forming annular
flange is one of a pair of axially spaced an
nular flanges connected by a tubular portion
enclosing said chamber, the chamber opening
through the other anuular flange to the passage
in the sleeve element, and the other annular
flange having a diameter less than that of the
extraction rim forming annular flange and
constituting at least part of said laterally pro
jecting means.
3. An ammunition cartridge according to
Claim 2 suitable for use in rifles, wherein
the sleeve element is a generally rotationally
symmetrical hollow structure having a cylin
drical base and a body portion, said cylindrical
base bearing against the one annular flange
of said pair of annular flanges and having
a smaller external diameter than said one
annular flange so that an outer rim portion
of said one annular flange is provided for
engagement with a cartridge ejector.
4. An ammunition cartridge according to
Claim 1, 2 or 3 wherein the body portion
of the sleeve element comprises at least one
annular beading engaged with an inner wall
portion of the cartridge case portion.
5. An ammunition cartridge according to
any one of the preceding claims wherein the sleeve element has a projecting edge portion having an external diameter substantially equal to that of said cartridge case portion.
6. An ammunition cartridge according to any one of the preceding claims wherein the passage in the sleeve element is of frustoconical shape.
7. An ammunition cartridge according to any one of the preceding claims wherein the passage in the sleeve element has an axial depth at least equal to the axial depth of said metal bottom element.
8. An ammunition cartridge according to any one of the preceding claims wherein the sleeve element consists of a synthetic organic thermoplastics composition having a ballpressure hardness (60 inch) of at least about 500 kp/cm2 and a modulus of elasticity of at least about 5 X 104 kp/cm2.
9. An ammunition cartridge according to any one of the preceding claims wherein an end portion of said cartridge case portion remote from said bottom insert is shaped as an imitation projectile having a predetermined rupture point and an axial length of not more than 25% of the total axial length of said cartridge case portion.
10. An ammunition cartridge according to any one of the preceding claims in which an inner wall portion of said cartridge case portion is provided with a plurality of elongated ribs for controlling volume and packing of an explosive charge provided within said inner wall portion.
11. An ammunition cartridge according to any one of the preceding claims wherein said cartridge case portion has an exterior wall portion provided with a plurality of longitudinally extending grooves for improved ex tractability of said cartridge from a cartridge chamber of a weapon.
12. An ammunition cartridge according to
Claims 10 and 11, wherein said ribs and said grooves extend in a direction generally parallel to the longitudinal axis of said cartridge.
13. An ammunition cartridge according to
Claims 10 and 11, wherein said ribs and said grooves extend helically around the longitudinal axis of said cartridge.
14. An ammunition cartridge according to any one of Claims 1 to 8 including a metal projectile received in a neck portion formed at the end of the cartridge case portion remote from the lower end thereof with a bondimproving coating at the interface between the projectile and the neck portion.
15. An ammunition cartridge according to any one of Claims 1 to 8 including a projectile made of a synthetic organic polymer material received in a neck portion formed at the end of the cartridge case portion remote from the lower end portion thereof with a coating at the interface between the projectile and the neck portion for preventing undesired interbonding of said projectile and said cartridge case portion.
16. An ammunition cartridge according to
Claim 14 or 15 wherein said projectile extends into an internal space portion of the cartridge case portion for support on a shoulder wall portion of the cartridge case portion.
17. An ammunition cartridge according to any one of Claims 1 to 8 including a projectile made of a synthetic organic polymer material and having a lower projectile portion disposed within the cartridge case portion at the end remote from the lower end thereof and an upper projectile portion protruding from the cartridge case portion, said lower projectile portion having a larger diameter than said upper projectile portion for improved guidance of said projectile in a weapon's barrel upon firing without impeding introduction of said cartridge into a cartridge chamber.
18. A method of manufacturing an ammunition cartridge according to Claim 1 which comprises the steps of shaping by deepdrawing a metal sheet material to form, as a unitary structure, a metal bottom element having an annular flange having a gauge substantially equal to that of the sheet material and having a diameter sufficient to form an extraction rim, a coaxial chamber for receiving a detonator cap and having an apertured upper wall portion, and laterally projecting means for anchoring the metal element to a sleeve element of a synthetic plastics composition, moulding the sleeve element on the metal bottom element with a passage therein communicating with the apertured upper wall portion of the chamber and securing the sleeve element in the lower end of a cartridge case portion of a synthetic plastics material with the passage communicating with the interior of the cartridge case portion.
19. A method according to Claim 18 in which the metal sheet material is initially in the form of a disc which is shaped by deepdrawing to form the annular flange and the coaxial chamber with the apertured upper wall portion, the chamber being defined by a tubular wall portion and in which the tubular wall portion is deformed to form a second annular flange axially spaced from and of a diameter less than the extraction rim forming annular flange, the second annular flange constituting at least a part of the laterally projecting means.
20. A method according to Claim 18 or 19 in which a detonator cap is provided in the coaxial chamber before the sleeve element is
secured in the lower end of the cartridge case portion.
21. A method according to Claim 18, 19 or 20 in which a charge is provided in the cartridge case portion before the sleeve element is secured in the lower end of the cartridge case portion.
22. An ammunition cartridge constructed, arranged and adapted to operate substsntially as herein described with reference to Fig. 1,
Fig. 2, Fig. 3, Figs. 4a and 4b, or Figs. 5a and 5b of the accompanying drawings.
23. A method of manufacturing an ammunition cartridge substantially as herein des onbed with reference to Fig. 1, Fig. 2, Fig. 3,
Figs. 4a and 4b or Figs. Sa and 5b of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO760525 | 1976-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1568545A true GB1568545A (en) | 1980-05-29 |
Family
ID=19882725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6094/77A Expired GB1568545A (en) | 1976-02-17 | 1977-02-14 | Ammunition cartidges and method of manufacturing same |
Country Status (13)
| Country | Link |
|---|---|
| AU (1) | AU503006B2 (en) |
| BE (1) | BE851488A (en) |
| CA (1) | CA1092440A (en) |
| CH (1) | CH611703A5 (en) |
| DE (1) | DE2706010A1 (en) |
| DK (1) | DK65677A (en) |
| ES (1) | ES455967A1 (en) |
| FI (1) | FI770490A (en) |
| FR (1) | FR2341834A1 (en) |
| GB (1) | GB1568545A (en) |
| IT (1) | IT1078216B (en) |
| NL (1) | NL7701594A (en) |
| SE (1) | SE7701673L (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008073058A1 (en) * | 2006-12-14 | 2008-06-19 | Advanced Material Engineering Pte Ltd | Adaptor for coupling projectile and propulsion unit |
| US7750091B2 (en) | 2005-03-07 | 2010-07-06 | Solvay Advanced Polymers, L.L.C. | Polyphenylene-poly(aryl ether sulfone) blends, articles and method |
| US9182204B2 (en) | 2011-07-28 | 2015-11-10 | Mac, Llc | Subsonic ammunition casing |
| US9335137B2 (en) | 2011-07-28 | 2016-05-10 | Mac, Llc | Polymeric ammunition casing geometry |
| US9453714B2 (en) | 2014-04-04 | 2016-09-27 | Mac, Llc | Method for producing subsonic ammunition casing |
| US9528799B2 (en) | 2014-01-13 | 2016-12-27 | Mac Llc | Neck polymeric ammunition casing geometry |
| GB2606368A (en) * | 2021-05-05 | 2022-11-09 | Bae Systems Plc | Lightweight end cap |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT393163B (en) * | 1990-02-27 | 1991-08-26 | Steyr Daimler Puch Ag | CARTRIDGE SLEEVE |
| FR2702555B1 (en) * | 1993-03-12 | 1995-04-28 | Giat Ind Sa | Case for a telescoped type ammunition. |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE732216C (en) * | 1940-02-11 | 1943-02-25 | Heinrich Krieghoff | Cartridges designed for firearms, especially automatic firearms |
| NL181534B (en) * | 1953-06-27 | Hochtemperatur Kernkraftwerk | SIDE REFLECTOR FOR A HIGH TEMPERATURE NUCLEAR REACTOR. | |
| DE1875055U (en) * | 1958-12-31 | 1963-07-04 | Gustav Genschow & Co A G | CARTRIDGE CASE MADE OF PLASTIC. |
| AT223075B (en) * | 1958-12-31 | 1962-08-27 | Gustav Genschow & Co Ges Mit B | Cartridge case made of plastic |
| DE2214092A1 (en) * | 1972-03-23 | 1973-09-27 | Dynamit Nobel Ag | MANOEVER CARTRIDGE |
| DE2233043A1 (en) * | 1972-06-13 | 1973-12-20 | Lars Ringdal | END PIECE FOR CARTRIDGE CASE |
-
1976
- 1976-12-06 CH CH1529776A patent/CH611703A5/en not_active IP Right Cessation
-
1977
- 1977-02-10 CA CA271,785A patent/CA1092440A/en not_active Expired
- 1977-02-12 DE DE19772706010 patent/DE2706010A1/en not_active Ceased
- 1977-02-14 GB GB6094/77A patent/GB1568545A/en not_active Expired
- 1977-02-15 FI FI770490A patent/FI770490A/fi not_active Application Discontinuation
- 1977-02-15 NL NL7701594A patent/NL7701594A/en not_active Application Discontinuation
- 1977-02-15 SE SE7701673A patent/SE7701673L/en unknown
- 1977-02-15 IT IT20289/77A patent/IT1078216B/en active
- 1977-02-16 ES ES455967A patent/ES455967A1/en not_active Expired
- 1977-02-16 AU AU22348/77A patent/AU503006B2/en not_active Expired
- 1977-02-16 FR FR7704390A patent/FR2341834A1/en active Granted
- 1977-02-16 DK DK65677A patent/DK65677A/en unknown
- 1977-02-18 BE BE174980A patent/BE851488A/en unknown
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7750091B2 (en) | 2005-03-07 | 2010-07-06 | Solvay Advanced Polymers, L.L.C. | Polyphenylene-poly(aryl ether sulfone) blends, articles and method |
| US8240252B2 (en) | 2005-03-07 | 2012-08-14 | Nikica Maljkovic | Ammunition casing |
| US8813650B2 (en) | 2005-03-07 | 2014-08-26 | Solvay Advanced Polymers, L.L.C. | Ammunition casing |
| US8850985B2 (en) | 2005-03-07 | 2014-10-07 | Solvay Advanced Polymers, L.L.C. | Polymeric material suitable for making ammunition cartridge casings |
| WO2008073058A1 (en) * | 2006-12-14 | 2008-06-19 | Advanced Material Engineering Pte Ltd | Adaptor for coupling projectile and propulsion unit |
| US9182204B2 (en) | 2011-07-28 | 2015-11-10 | Mac, Llc | Subsonic ammunition casing |
| US9335137B2 (en) | 2011-07-28 | 2016-05-10 | Mac, Llc | Polymeric ammunition casing geometry |
| US9395165B2 (en) | 2011-07-28 | 2016-07-19 | Mac, Llc | Subsonic ammunition casing |
| US9528799B2 (en) | 2014-01-13 | 2016-12-27 | Mac Llc | Neck polymeric ammunition casing geometry |
| US9453714B2 (en) | 2014-04-04 | 2016-09-27 | Mac, Llc | Method for producing subsonic ammunition casing |
| GB2606368A (en) * | 2021-05-05 | 2022-11-09 | Bae Systems Plc | Lightweight end cap |
Also Published As
| Publication number | Publication date |
|---|---|
| ES455967A1 (en) | 1978-01-16 |
| FR2341834A1 (en) | 1977-09-16 |
| AU503006B2 (en) | 1979-08-16 |
| CA1092440A (en) | 1980-12-30 |
| FR2341834B3 (en) | 1979-03-09 |
| AU2234877A (en) | 1978-08-24 |
| BE851488A (en) | 1977-06-16 |
| IT1078216B (en) | 1985-05-08 |
| CH611703A5 (en) | 1979-06-15 |
| SE7701673L (en) | 1977-08-18 |
| DK65677A (en) | 1977-08-18 |
| FI770490A (en) | 1977-08-18 |
| NL7701594A (en) | 1977-08-19 |
| DE2706010A1 (en) | 1977-08-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4147107A (en) | Ammunition cartridge | |
| US6752084B1 (en) | Ammunition articles with plastic components and method of making ammunition articles with plastic components | |
| US7441504B2 (en) | Base for a cartridge casing body for an ammunition article, a cartridge casing body and an ammunition article having such base, wherein the base is made from plastic, ceramic, or a composite material | |
| CA1066131A (en) | Cartridge | |
| US4867065A (en) | Training cartridge | |
| US7059234B2 (en) | Ammunition articles and method of making ammunition articles | |
| US4208968A (en) | Projectile for practice ammunition | |
| US3935816A (en) | Construction for cartridge | |
| US20050257711A1 (en) | A Cartridge Casing Body And An Ammunition Article Having A Cartridge Casing Body Wherein The Cartridge Casing Body Is Plastic, Ceramic, Or A Composite Material | |
| US3485170A (en) | Expendable case ammunition | |
| US3491691A (en) | Shell casing and its method of manufacture | |
| US6119600A (en) | Projectile and method for producing it | |
| US20200363172A1 (en) | Lightweight cartridge case | |
| US4108074A (en) | Frangible target practice projectile | |
| US4419318A (en) | Process for forming projectiles for smooth bore shooting guns | |
| US20120174813A1 (en) | Modular case ammunition and methods of assembly | |
| GB1568545A (en) | Ammunition cartidges and method of manufacturing same | |
| US10072916B2 (en) | Methods and apparatus for making molded objects, and molded objects made therefrom | |
| US5183963A (en) | Two piece projectile | |
| US5164540A (en) | Slipping driving band for projectiles of any caliber | |
| US3722420A (en) | Tapered cup wad | |
| US4007686A (en) | Cartridge casing | |
| US2915972A (en) | Ammunition | |
| US3125924A (en) | Charles e | |
| US3611938A (en) | Plastic shot shell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |