US3842739A - Metallic mouth for a plastic cartridge case - Google Patents

Metallic mouth for a plastic cartridge case Download PDF

Info

Publication number
US3842739A
US3842739A US00365590A US36559073A US3842739A US 3842739 A US3842739 A US 3842739A US 00365590 A US00365590 A US 00365590A US 36559073 A US36559073 A US 36559073A US 3842739 A US3842739 A US 3842739A
Authority
US
United States
Prior art keywords
mouth member
cartridge case
projectile
forward end
cartridge
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 - Lifetime
Application number
US00365590A
Other languages
English (en)
Inventor
J Scanlon
T Owen
R Anderson
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.)
Remington Arms Co LLC
Original Assignee
Remington Arms Co LLC
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 Remington Arms Co LLC filed Critical Remington Arms Co LLC
Priority to US00365590A priority Critical patent/US3842739A/en
Priority to DE2419881A priority patent/DE2419881A1/de
Priority to CA198,881A priority patent/CA1022000A/en
Priority to SE7406751A priority patent/SE7406751L/xx
Priority to BR4197/74A priority patent/BR7404197D0/pt
Priority to BE145007A priority patent/BE815836A/xx
Application granted granted Critical
Publication of US3842739A publication Critical patent/US3842739A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F42B5/073—Mounting or locking missiles in cartridge cases using an auxiliary locking element

Definitions

  • a cartridge case having a plastic body has a metallic tubular mouth member affixed thereto.
  • a generally cylindrical projectile-receiving portion may be crimped to securely hold a projectile and a rear portion of the mouth member is tapered to match the inner contour of the plastic case.
  • Interaction of a circumferentia lrib with 5 Forward gunfcliarhber wall and the interaction of matching shoulders on the mouth member and the plastic body prevent separation of the mouth member from the cartridge case during firing, extraction and ejection.
  • the mouth member provides enhanced reloadability for the cartridge case and produces a center of gravity matching that of metallic cartridge cases for optimum ejection characteristics.
  • This invention relates to ammunition and, more particularly, to a metallic mouth member for a plastic cartridge case.
  • cartridge cases for ammunition have been made from suitable metals,-such as brass.
  • suitable metals such as brass.
  • these metals have increased in cost to such a great extent that it has become desirable, if not necessary, to seek less expensive substitute materials. This has been particularly true in large caliber ammunition wherein the volume of material utilized for the cartridge case is much higher.
  • the metallicmouth member has a rearwardly extending annular flange which is molded into the synthetic resin material of the cartridge case.
  • a metallic mouth member for attachment to a plastic cartridge case body.
  • the mouth member has a thickened external rib which interacts with a forward wall of the chamber to prevent any motion of the mouth member into the bore upon firing.
  • a tapered rear portion of the mouth member has an outer contour matching the inner contour of the plastic body and a forward end portion of the plastic cartridge case body surrounds a frusto-conical attachment portion of the mouth memher to provide positive interaction between the body and the mouth member and prevent separation during extraction.
  • the mouth member by adding metal to the forward end of the cartridge case, makes center of gravity control a simple matter, thus ensuring proper ejection characteristics for the case, and may, if desired, be thermally or chemically bonded to the plastic body.
  • FIG. 1 is a partially sectioned side elevation of a round of ammunition having a cartridge case made in accordance with this invention
  • FIG. 2 is a perspective view'of a metallic mouth member for use in the cartridge case of FIG. 1;
  • FIG. 3 is a fragmentary sectional view of the cartridge of FIG. 1 chambered in a gun.
  • FIG. 4 is a fragmentary sectional view, similar to FIG. 3, of a chambered cartridge case.
  • a cartridge 10 is made with a multicomponent cartridge case 11, which, for the purposes of this description, may be of a size for use in a 20 mm. gun.
  • the cartridge case 11 has a nonmetallic body portion 12, preferably moldedfrom a suitable plastic, and may have a metal head 14.
  • the head 14 may be substantially unitary in construction or may, as shown, be of a multi-component construction such as is disclosed in the above-identified U.S. Pat. application Ser. No. 320,328.
  • a primer 15 is secured in the breech end of the cartridge case 11 for igniting a charge of a suitable propellant 16 when the primer 15 is struck by a firing pin (not shown).
  • a metallic mouth member 20' is secured to a forward end portion of the body 12 and receives a projectile 21' in a generally cylindrical projectile-receiving portion 22 of the mouth member 20.
  • the projectile 21 may be secured to the mouth member 20 by forming a crimp 24 in the projectile-receiving portion 22 in a conventional manner.
  • the rib 26 is preferably in abutment with an inwardly tapered forward end portion of the plastic body 12 which forms the remainder of the shoulder portion 25 of the cartridge case.
  • a rear portion 29 of the mouth member 20 extends rearwardly fromthe interlocking portion 27 and is outwardly tapered to match the inner contour of the body 12.
  • the mouth member 20 is preferably machined or drawn from a single piece of steel, or other suitable material, and may be secured to the body 12 by any suitable method consistent with the mode of manufacture of the cartridge case, such as by insert molding or by positioning the mouth member 20 within the forward end of the body 12 before necking down the forward end portion 12a.
  • the contiguous surfaces of the mouth member 20 and body 12 may be further secured to each other by induction welding in a manner well known to those skilled in the art.
  • induction welding in a manner well known to those skilled in the art.
  • additional securement is not necessary to maintain the structural integrity of the cartridge case 11 during firing and extraction.
  • the cartridge When the cartridge is to be fired, it is placed in the chamber 30 (see FIG. 3) of a suitable caliber gun with the shoulder portion 25 of the cartridge case 11 abutting a tapered forward wall 31 of the chamber 30 and with the projectile-receiving portion 22 of the mouth member and the attached projectile 21 extending into the bore 32 of a barrel 33.
  • combustion of the propellant 16 produces copious quantities of expanding gases which increase the pressure in the cartridge case 11 to a level, generally on the order of about 50,000 psi, sufficient to open the crimp 24 and cause the separation of the projectile 21 from the mouth member 20.
  • the mouth member 20 is urged forwardly by the projectile 21, the circumferentially thickened rib 26 is pulled in the direction shown by an arrow 34 in FIG. 4. It can be clearly seen that the rib 26 is immediately engaged by the tapered forward wall 31 0f the chamber 30 thus preventing any forward motion which could otherwise separate the mouth member 20 from the body 12.
  • Extraction of the empty cartridge case is accomplished by the application of a rearward force on an extractor rim of the cartridge case 11 by an extractor claw (not shown). This rearward force pulls the cartridge case 11 from the chamber 30 and it is important that the mouth member 20 be withdrawn with the cartridge case 11 without separation from the body 12.
  • the folding of the forward end portion 12a of the body 12 around the central interlocking portion 27 of the mouth member 20 provides a positive interaction of components to ensure that proper securement of the mouth member 20 to the body 12 is maintained throughout extraction and ejection.
  • the forward end portion 12a applies a rearwardly directed force against the central attachment portion 27 of the mouth member 20, as shown by an arrow 35 in FIG. 4.
  • the interaction of the mouth member 20 and body 12 is strengthened during firing, as has been shown, so that mouth pull-out, often experienced with prior art plastic-steel cartridges, will not occur.
  • the body 12 positively grasps the mouth member 20 for removal.
  • the position of the center of gravity of the cartridge case 11 can be accurately and easily controlled. It will be readily understood that a plastic-steel cartridge case having the same center of gravity as a comparable brass cartridge case will exhibit ejection characteristics substantially identical to the brass cartridge case, even though the plastic-steel case is substantially lighter in weight.
  • a metallic mouth member is provided for a plastic-steel cartridge case which provides enhanced reloadability for the cartridge case, prevents mouth pull-out during firing, extraction and ejection, and produces a center of gravity enabling the cartridge case to duplicate the ejection characteristics of brass cartridge cases.
  • a multi-component cartridge case is intended to include any cartridge case having two or more components, including a body (which may have an integral head) and a mouth member. While a plastic body and metal mouth member are utilized in the preferred embodiment, other combinations of similar or dissimilar materials may be utilized without departing from the spirit and scope of this invention.
  • a tubular mouth member having a generally cylindrical projectile-receiving portion and a generally frusto-conical interlocking portion, the mouth member being secured within the plastic body with the inwardly tapered forward end portion of the plastic body engaging the interlocking portion of the mouth member and with the projectile-receiving portion extending forwardly of the plastic body.
  • a mouth member for a multi-component cartridge case comprising a tubular projectile-receiving portion, a tubular rear portion, a generally frusto-conical interlocking portion joining the projectile-receiving portion and the rear portion, and a circumferential rib positioned at one' end of the interlocking portion adjacent to the projectile-receiving portion.
  • a cartridge case comprising a body having an inwardly tapered forward end portion and a mouth member having a tubular projectile-receiving portion, a generally frusto-conical interlocking portion for positioning within the tapered forward end portion of the body, and a circumferential rib joining the projectilereceiving portion and the interlocking portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Toys (AREA)
US00365590A 1973-05-31 1973-05-31 Metallic mouth for a plastic cartridge case Expired - Lifetime US3842739A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00365590A US3842739A (en) 1973-05-31 1973-05-31 Metallic mouth for a plastic cartridge case
DE2419881A DE2419881A1 (de) 1973-05-31 1974-04-24 Patronenhuelse
CA198,881A CA1022000A (en) 1973-05-31 1974-05-03 Metallic mouth for a plastic cartridge case
SE7406751A SE7406751L (sv) 1973-05-31 1974-05-21 Patronhylsa.
BR4197/74A BR7404197D0 (pt) 1973-05-31 1974-05-23 Capsula de cartucho
BE145007A BE815836A (fr) 1973-05-31 1974-05-31 Douille de cartouche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00365590A US3842739A (en) 1973-05-31 1973-05-31 Metallic mouth for a plastic cartridge case

Publications (1)

Publication Number Publication Date
US3842739A true US3842739A (en) 1974-10-22

Family

ID=23439491

Family Applications (1)

Application Number Title Priority Date Filing Date
US00365590A Expired - Lifetime US3842739A (en) 1973-05-31 1973-05-31 Metallic mouth for a plastic cartridge case

Country Status (6)

Country Link
US (1) US3842739A (de)
BE (1) BE815836A (de)
BR (1) BR7404197D0 (de)
CA (1) CA1022000A (de)
DE (1) DE2419881A1 (de)
SE (1) SE7406751L (de)

Cited By (123)

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Publication number Priority date Publication date Assignee Title
US3977326A (en) * 1975-02-06 1976-08-31 Remington Arms Company, Inc. Composite cartridge casing and method of assembly
US3990366A (en) * 1975-02-06 1976-11-09 Remington Arms Company, Inc. Composite ammunition casing with forward metallic portion
US4187271A (en) * 1977-04-18 1980-02-05 Owens-Corning Fiberglas Corporation Method of making same
WO1986006466A1 (en) * 1985-04-22 1986-11-06 Action Manufacturing Company Stress modulator ring and microgrooved base for an ammunition cartridge having a plastic case
US4640195A (en) * 1983-12-27 1987-02-03 General Defense Corporation Rocket launching cartridge case and assembly
FR2620214A1 (fr) * 1987-09-09 1989-03-10 France Etat Armement Bague de liaison entre un projectile et une douille
WO1994020814A1 (fr) * 1993-03-12 1994-09-15 Giat Industries Etui pour munition de type telescopee
US6752084B1 (en) 1999-01-15 2004-06-22 Amtech, Inc. Ammunition articles with plastic components and method of making ammunition articles with plastic components
US20040255502A1 (en) * 1997-03-17 2004-12-23 Jamison John R. Ultra-short-action firearm for high-power firearm cartridge
US20050081704A1 (en) * 2003-05-29 2005-04-21 Nabil Husseini Ammunition articles and method of making ammunition articles
US20050188879A1 (en) * 2003-10-29 2005-09-01 Polytech Ammunition Company Lead free, composite polymer based bullet and cartridge case, and method of manufacturing
US20050257711A1 (en) * 1999-01-15 2005-11-24 Natec, Inc. 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
US20060075919A1 (en) * 2002-10-29 2006-04-13 Polytech Ammunition Company Composite polymer based cartridge case having an overmolded metal cup, polymer plug base assembly
WO2008091245A2 (en) * 2007-01-19 2008-07-31 General Dynamics Ordnance And Tactical Systems - Simunition Operations, Inc. Thin-walled cartridge casing with exterior reinforced head end
US20090044717A1 (en) * 1999-01-15 2009-02-19 Development Capital Managment Company 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
FR2942032A1 (fr) * 2009-02-12 2010-08-13 Nexter Munitions Procede de fixation d'un projectile en matiere plastique sur un etui metallique et projectile permettant la mise en oeuvre de ce procede
US20110179965A1 (en) * 2009-11-02 2011-07-28 Mark Mason Ammunition assembly
US20120111219A1 (en) * 2010-11-10 2012-05-10 True Velocity, Inc. Lightweight polymer ammunition cartridge casings
US8443730B2 (en) 2011-01-14 2013-05-21 Pcp Tactical, Llc High strength polymer-based cartridge casing and manufacturing method
US8573126B2 (en) 2010-07-30 2013-11-05 Pcp Tactical, Llc Cartridge base and plastic cartridge case assembly for ammunition cartridge
US8763535B2 (en) 2011-01-14 2014-07-01 Pcp Tactical, Llc Narrowing high strength polymer-based cartridge casing for blank and subsonic ammunition
US8807008B2 (en) 2011-01-14 2014-08-19 Pcp Tactical, Llc Polymer-based machine gun belt links and cartridge casings and manufacturing method
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US20150192394A1 (en) * 2014-01-09 2015-07-09 Randy R. Fritz Hollow Slug and Casing
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US9506735B1 (en) * 2016-03-09 2016-11-29 True Velocity, Inc. Method of making polymer ammunition cartridges having a two-piece primer insert
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US9523563B1 (en) * 2016-03-09 2016-12-20 True Velocity, Inc. Method of making ammunition having a two-piece primer insert
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US9835427B2 (en) * 2016-03-09 2017-12-05 True Velocity, Inc. Two-piece primer insert for polymer ammunition
US9869536B2 (en) * 2016-03-09 2018-01-16 True Velocity, Inc. Method of making a two-piece primer insert
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Also Published As

Publication number Publication date
SE7406751L (sv) 1974-12-01
DE2419881A1 (de) 1974-12-19
BR7404197D0 (pt) 1975-10-07
BE815836A (fr) 1974-12-02
CA1022000A (en) 1977-12-06

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