EP0131863B1 - Douille de munition en matière plastique - Google Patents

Douille de munition en matière plastique Download PDF

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Publication number
EP0131863B1
EP0131863B1 EP84107884A EP84107884A EP0131863B1 EP 0131863 B1 EP0131863 B1 EP 0131863B1 EP 84107884 A EP84107884 A EP 84107884A EP 84107884 A EP84107884 A EP 84107884A EP 0131863 B1 EP0131863 B1 EP 0131863B1
Authority
EP
European Patent Office
Prior art keywords
casing
bullet
diameter
cartridge
bullet end
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
Application number
EP84107884A
Other languages
German (de)
English (en)
Other versions
EP0131863A3 (en
EP0131863A2 (fr
Inventor
Marlo Keith Vatsvog
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CONFEDERATE CREEK, INC.
Original Assignee
Confederate Creek Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Confederate Creek Inc filed Critical Confederate Creek Inc
Priority to AT84107884T priority Critical patent/ATE37602T1/de
Publication of EP0131863A2 publication Critical patent/EP0131863A2/fr
Publication of EP0131863A3 publication Critical patent/EP0131863A3/en
Application granted granted Critical
Publication of EP0131863B1 publication Critical patent/EP0131863B1/fr
Expired legal-status Critical Current

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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
    • 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
    • F42B5/067—Mounting or locking missiles in cartridge cases

Definitions

  • the invention relates to a cartridge according to the preamble of claim 1.
  • Brass casings Conventional cartridges for handguns are made with brass casings.
  • the brass casing includes an integrally formed head containing a primer cup for igniting the powder charged at one end, and at the other end is crimped over a bullet or other projectile.
  • Brass casings have the advantage of being reusable.
  • Brass casings have several disadvantages, however. Brass is expensive and requires special tooling to recrimp or reform the bullet end of the casing over the bullet so that it will fit tightly over the bullet.
  • a cartridge described in the preamble of claim 1 is disclosed in US Patent 3,099,958. This cartridge is not reloadable.
  • the bullet By providing sufficient elasticity at the bullet end of the casing, the bullet will be released when the powder is ignited but will not tear or deteriorate the bullet end of the casing after several repeated firings so that it may be reloadable. It is desirable to reach a reloadability of at least four or five times, and in some instances, it is believed that as many as twenty reloads can be made with the unique plastic casing.
  • the cartridge includes a casing or case 10, including an end cap 14 containing a conventional primer cup 15 and a bullet 12.
  • the primer cup has a small anvil.
  • the firing pin of the gun indents the cup along the anvil to ignite a small charge, which in turn ignites the powder charge 16 within the casing.
  • one unique advantage of this plastic casing is that due to predetermined locations of interlocking rings and grooves the bullet is always seated accurately axially along the length of the casing so that the same volume for powder is created in the casing even after repeated firings.
  • the same gas conditions will exist in the casing so that the bullet always is subjected to substantially equal gas pressures upon repeated firings. This feature provides greater accuracy of the trajectory of the bullet upon firing.
  • the bullet may be of any material, preferably brass-coated lead and is provided with a radially smaller circumferential outer surface 18 having a pair of axially spaced, inwardly protruding grooves 19.
  • the bullet end 10b of the casing 10 is provided with a thinner wall and a pair of matching, axially spaced rings 20.
  • the thinner wall gives the bullet end of the casing increased flexibility, and with the inherent elasticity of the plastic, allows the bullet end to radially expand upon firing, releasing the bullet and then returning to its original shape for reloading.
  • the chamber of a handgun is cylindrical.
  • the stepped bullet end of the casing ( Figures 2 and 5) or the tapered end ( Figure 3) are free to radially expand to release the bullet.
  • the plastic used to ensure the qualities of durability and elasticity is a high-density polyethylene plastic manufactured by DuPont Corporation, having a Young's modulus about 10 10 dynes/cm 2 and a Poisson's ratio of about 0.3.
  • Other plastics having suitable qualities may also be used.
  • the bullet is provided with an inwardly tapering groove 30.
  • the bullet end of the casing 40b is tapered radially inwardly to seat within the bullet groove 30.
  • the rings may be of different dimensions, as shown in Fig. 5.
  • the ring 22 near the end of the casing has an inside diameter slightly greater than the inside diameter of the inner casing ring 24, so that, when the bullet 12a disengages the rings, the base 13 of the bullet will not contact the end ring 22 as the bullet exits the casing.
  • the rings 22 and 24 may have tapered sides, making the rings 22 and 24 annular trapezoidal solids, in effect. The tapered sides strengthen the rings to withstand the violent exiting of the bullet from the casing. Generally, the greater the facing angle opposing exit of the bullet the greater the pressure needed to eject the bullet. While two rings are shown, and are highly preferred, one could use more rings, if desired, for higher pressure, larger calibre cartridges. Those additional grooves may lead to an unbalanced bullet, however.
  • the end cap end of the casing 10e and 40e, respectively, is provided with an inwardly extending flange 21 having an axial dimension shown by the reference character X.
  • the thickness of this axial dimension is critical, as it must be thick enough to withstand perforating and shearing from the high-pressure gases upon firing of the powder charge but thin enough to allow the flange to flex rearwardly to compress and to form a resilient seal around the radial surfaces of the end cap.
  • this axial thickness is 0.8 mm, although a slight range of from about 0.5-1.0 mm has also been successfully tested.
  • the flange 21 has a slight inwardly and axially increasing, curving or straight taper to increase the gas pressure on the cylindrical end surface 25 of the end cap, and to form a crimping surface for a metal end cap 14.
  • the end cap is held onto the casing by slight crimping of the cylindrical surface of the end cap over the flange, as shown by the reference numeral 27.
  • the end cap 14 is a rigid material interlocked to the flange by any other suitable means, such as welding, bonding or mechanically interlocking.
  • a small dimple 28 is provided on the cylindrical end of the end cap so that the casing can be merely snapped over the end cap rather than requiring a crimping tool to attach the end cap to the casing.
  • the crimp or the dimple does not provide a seal, but rather is merely a mechanical attachment mechanism.
  • the seal against escape of gases, which is critical to accurate firing, is provided by the flexibility and compressibility of the flanges 21 so that they seat tightly against the end cap surfaces.
  • the bullet end is merely pressed open by the bullet and the bullet pressed rearwardly until it snaps into place.
  • the old end cap is then pressed out and the new end cap replaced and crimped or seated by the dimples 28 into place.
  • the correct powder charge will precede placement of the bullet into the casing.
  • the seal between the end cap and casing can be achieved with a gasket 34.
  • a thicker flange 32 extends radially inwardly and overlies a flexible gasket 34.
  • the high pressures within the casing usually between about 8,400-15,000 N/cm 2 (12,000-21,800) psi) for a .38 special shell
  • Plastics are highly preferred for the sealing flanges or gaskets because they have a much higher bulk compressibility (K) and intrinsic flexibility than metals.
  • Unoriented polymers such as high density polyethylene, have a Young's modulus (e) of about one to two orders of magnitude less than metals such as steel or aluminum.
  • the Poisson's ratio for polymers generally is between about 0.3-0.4, while for metals, such as steel or aluminum, it is about 0.4-0.5.
  • the bulk compressibility (K) that is, the softness or sponginess) of polymers is far greater than metals. Under pressure, the polymers will tend to seal by elasticity deforming on the end cap.
  • the flange 32 must be capable of transmitting the pressure pulse to the gasket 34 to achieve the desired sealing effect. It is usually about 1.6 mm (1/16 inch) thick.
  • end cap generally has a pillbox shape
  • a corresponding plastic flange 38 on the casing overlies the inner sealing surface 39 of the section 36 and forms a seal on this surface when the cartridge fires.
  • the flange 38 is elastically deformable, as described with reference to Figs. 2 and 3.
  • a gasket seal (not shown) could be made.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Closures For Containers (AREA)
  • Laminated Bodies (AREA)
  • Pens And Brushes (AREA)

Claims (7)

1. Cartouche formée à partir d'un étui tubulaire (10) en matière plastique et d'une balle métallique (12) logée à l'intérieur de l'étui (10) pour être utilisée dans une chambre à cartouche ayant une paroi latérale cylindrique, ledit étui (10) ayant une extrémité balle ouverte sur une partie centrale dudit étui (10), une partie (10b) de ladite extrémité balle, où la balle est logée, ayant un diamètre extérieur réduit et une épaisseur de paroi réduite vis-à-vis de la partie centrale de l'étui (10), le diamètre extérieur de celui-ci correspondant au diamètre intérieur de la paroi latérale de la chambre à cartouche, caractérisée en ce que l'étui (10) est conçu pour être rechargé, en ce que la différence entre le diamètre extérieur de la partie centrale de l'étui (10) et le diamètre plus faible de la partie (10b) de l'extrémité balle est faible et en ce que la partie (10b) de l'extrémité balle est flexible radialement et élastiquement vers l'extérieur afin que la partie (10b) de l'extrémité balle - puisse s'expanser en fléchissant vers la paroi latérale de la chambre à cartouche lors du tir de la cartouche, sans dépasser la limite élastique de la matière de l'étui (10).
2. Cartouche selon la revendication 1, caractérisée en ce que la différence entre le diamètre de la paroi latérale de la chambre à cartouche entourant la partie flexible (10b) de plus faible diamètre de l'extrémité balle de l'étui (10) et le diamètre de la partie (10b) de plus faible diamètre de l'extrémité balle de l'étui (10) est d'environ 3-5% du diamètre de la paroi latérale de la chambre entourant la partie flexible (10b) de plus faible diamètre de l'extrémité balle de l'étui (10).
3. Etui selon la revendication 1 ou 2, caractérisé en ce que ladite partie flexible (10b) de plus faible diamètre de l'extrémité balle de l'étui (10) présente un diamètre globalement constant sur toute la longueur de l'extrémité balle.
4. Etui selon l'une des revendications 1-3, caractérisé en ce que l'extrémité balle de l'étui (10) comporte au moins un anneau circonférentiel (20, 22, 24) s'étendant vers l'intérieur.
5. Cartouche selon l'une des revendications 1-4, caractérisée en ce que l'extrémité balle de l'étui (10) comporte au moins deux anneaux circonférentiels (22, 24), espacés axialement, s'étendant vers l'intérieur, l'anneau axialement extérieur (22) étant d'un diamètre plus grand que l'anneau axialement intérieur (24).
6. Cartouche selon l'une des revendications 1-5, caractérisée en ce que l'extrémité étui de la balle (12) présente deux gorges espacées axialement ayant des diamètres extérieurs, chacun plus petit que la partie d'appui de la balle (12), l'extrémité balle de l'étui (10) comportant au moins deux anneaux circonférentiels intérieurs (22, 24), espacés axialement, l'extrémité étui, située axialement le plus à l'intérieur, de la balle étant plus petit que le diamètre de l'anneau circonférentiel axialement extérieur (22) de l'extrémité balle de l'étui (10) afin de se dégager de l'anneau circonférentiel axialement extérieur (22) de l'extrémité balle de l'étui (10) lors du tir.
7. Cartouche selon l'une des revendications 1-5, caractérisée en ce que ladite balle (12) présente une surface circonférentielle vers l'arrière s'effilant axialement et radialement vers l'intérieur pour former un siège (30) d'étui, ladite extrémité balle (40b) dudit étui (40) ayant une paroi s'effilant radialement vers l'intérieur pour recevoir ledit siège (30) de la balle, afin que l'extrémité balle de l'étui puisse s'expanser élastiquement lors du tir pour libérer la balle (12), puis revenir vers sont état effilée pour le rechargement.
EP84107884A 1983-07-15 1984-07-05 Douille de munition en matière plastique Expired EP0131863B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84107884T ATE37602T1 (de) 1983-07-15 1984-07-05 Patronenhuelse aus kunststoff.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US51425783A 1983-07-15 1983-07-15
US514257 1983-07-15
US56982484A 1984-01-11 1984-01-11
US569824 1995-12-08

Publications (3)

Publication Number Publication Date
EP0131863A2 EP0131863A2 (fr) 1985-01-23
EP0131863A3 EP0131863A3 (en) 1986-04-09
EP0131863B1 true EP0131863B1 (fr) 1988-09-28

Family

ID=27058155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107884A Expired EP0131863B1 (fr) 1983-07-15 1984-07-05 Douille de munition en matière plastique

Country Status (6)

Country Link
EP (1) EP0131863B1 (fr)
DE (1) DE3474344D1 (fr)
ES (2) ES290658Y (fr)
FI (1) FI842736A (fr)
NO (1) NO842873L (fr)
PT (1) PT78902B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11118851B2 (en) 2016-03-25 2021-09-14 Vista Outdoor Operations Llc Reduced energy MSR system

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3507643A1 (de) * 1985-03-05 1986-09-11 Nico-Pyrotechnik Hanns-Jürgen Diederichs GmbH & Co KG, 2077 Trittau Patronierte munition
DE4131285C2 (de) * 1991-09-20 1997-05-28 Rheinmetall Ind Ag Anzünderbuchse für eine Treibladung
US6752084B1 (en) 1999-01-15 2004-06-22 Amtech, Inc. Ammunition articles with plastic components and method of making ammunition articles with plastic components
US7059234B2 (en) 2003-05-29 2006-06-13 Natec, Inc. Ammunition articles and method of making ammunition articles
US9470485B1 (en) 2004-03-29 2016-10-18 Victor B. Kley Molded plastic cartridge with extended flash tube, sub-sonic cartridges, and user identification for firearms and site sensing fire control
US8186273B2 (en) * 2009-05-04 2012-05-29 Roger Blaine Trivette Plastic ammunition casing and method
US8443730B2 (en) * 2011-01-14 2013-05-21 Pcp Tactical, Llc High strength polymer-based cartridge casing and manufacturing method
US8763535B2 (en) 2011-01-14 2014-07-01 Pcp Tactical, Llc Narrowing high strength polymer-based cartridge casing for blank and subsonic ammunition
US10197366B2 (en) 2011-01-14 2019-02-05 Pcp Tactical, Llc Polymer-based cartridge casing for blank and subsonic ammunition
US9921017B1 (en) 2013-03-15 2018-03-20 Victor B. Kley User identification for weapons and site sensing fire control
WO2014203216A1 (fr) * 2013-06-20 2014-12-24 Atlantis Manufacturing Management Services Proprietary Limited Munition de type grenade
EP3433561B1 (fr) 2016-03-25 2021-03-17 Vista Outdoor Operations LLC Système msr à énergie réduite
WO2020028187A1 (fr) 2018-07-30 2020-02-06 Pcp Tactical, Llc Cartouche de polymère avec insert métallique à ajustement par encliquetage amélioré et rapports d'épaisseur améliorés

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099958A (en) * 1960-01-12 1963-08-06 Remington Arms Co Inc Firearm cartridges

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026802A (en) * 1958-12-16 1962-03-27 Fredrick R Barnet Plastics lightweight cartridge case
GB1015516A (en) * 1963-07-16 1966-01-05 Remington Arms Co Inc Improvements in or relating to firearm cartridges
SE394512B (sv) * 1971-06-04 1977-06-27 Bofors Ab Tetningsanordning vid ammunition
DE2705235A1 (de) * 1977-02-08 1978-08-17 Dynamit Nobel Ag Leichte patrone

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099958A (en) * 1960-01-12 1963-08-06 Remington Arms Co Inc Firearm cartridges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11118851B2 (en) 2016-03-25 2021-09-14 Vista Outdoor Operations Llc Reduced energy MSR system
US11713935B2 (en) 2016-03-25 2023-08-01 Federal Cartridge Company Reduced energy MSR system

Also Published As

Publication number Publication date
ES290658U (es) 1986-10-01
DE3474344D1 (en) 1988-11-03
PT78902B (en) 1986-06-05
NO842873L (no) 1985-01-16
FI842736A (fi) 1985-01-16
ES294112Y (es) 1987-06-16
ES290658Y (es) 1987-06-01
EP0131863A3 (en) 1986-04-09
PT78902A (en) 1984-08-01
EP0131863A2 (fr) 1985-01-23
ES294112U (es) 1986-10-16
FI842736A0 (fi) 1984-07-06

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