US3756156A - Bottom wad for cartridge cases, especially shot cartridge cases - Google Patents

Bottom wad for cartridge cases, especially shot cartridge cases Download PDF

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Publication number
US3756156A
US3756156A US00094329A US3756156DA US3756156A US 3756156 A US3756156 A US 3756156A US 00094329 A US00094329 A US 00094329A US 3756156D A US3756156D A US 3756156DA US 3756156 A US3756156 A US 3756156A
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United States
Prior art keywords
cylindrical portion
cylindrical
bottom wad
wad according
plug
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
US00094329A
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English (en)
Inventor
E Schuster
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.)
Dynamit Nobel AG
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Dynamit Nobel AG
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Filing date
Publication date
Priority claimed from DE19691960355 external-priority patent/DE1960355C3/de
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
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Publication of US3756156A publication Critical patent/US3756156A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • ABSTRACT A bottom wad for cartridges, especially shot cartridges, comprising a cylindrical portion of a thermoplastic synthetic material such as synthetic resin having a front recess for the accommodation of a powder charge.
  • a cylindrical plug is inserted in a rear recess of the cylindrical portion, and both the cylindrical plug and cylindrical portion have a common central, coaxial bore for the reception of primer.
  • Cartridge cases such as shot cartridges or the like are in most cases manufactured from several parts, such as a case shank and a bottom section which are joined to each other in a zone of the bottom by pressure.
  • pressed cardboard is employed for the bottom plugs.
  • bottom plugs are known which consist of a hollow body produced from a snythetic resin and provided with a loose filling of wood, shavings, or the like.
  • the bottom plugs in addition to having a sealing function, must often also fulfill the task of transmitting the compressive forces for the formation of the case botton during the manufacture of the cartridge cases.
  • the bottom plugs by means of their hardness as well as by the firmness of their seating in the case shank, influence the percussion sensitivity of the primer and have an effect on the internal ballistics of the cartridges due to the volume and the configuration of these plugs.
  • the bottom plugs must have a sufiicient hardness in the zone of the case bottom as exhibited, for example, by hard-pressed cardboard plugs or massive plugs of a relatively hard plastic.
  • the above-mentioned bottom plugs of hollow bodies of a synthetic resin with fillings of loose materials are, however, unsatisfactory for most of the manufacturing methods employed.
  • the conventional and above-mentioned cardboard plugs cannot be manufactured and processed in any desired or required shape and size, especially not with configurations of the recesses for the powder which are favorable from the viewpoint of internal ballistics, and with elastic sealing lips at the front end.
  • a bottom wad or plug characterized by a cylindrical portion and produced from a thermoplastic synthetic material such as, for example, polyethylene, with a front recess for the accommodation of the powder charge, as well as by a cylindrical plug of cardboard and/or fibrous material and/or a mineral substance inserted in a rear recess of the cylindrical portion, wherein the cylindrical portion and the cylindrical plug have a common central, coaxial' perforation or bore for the reception of the primer.
  • the cylindrical plastic portion can be manufactured very economically in any desired or suitable or required shape and dimension.
  • an elastic, preferably halogen-free thermoplastic synthetic material especially on the basis of olefinic hydrocarbons, such as, for example, polyethylene.
  • the plastic can be colorless or also dyed in any desired manner.
  • the plastic portion is constructed so that it terminates at the front end in a thin, annular lip.
  • the provision can also be made to design the front end of the cylindrical portion as a support or seat for an intermediate substance of the cartridge. In the latter case, it is possible to attain without difficulties a feasible compromise between the elasticity desired for sealing reasons and the size of the supporting surface required for a secure seating of the intermediate medium.
  • FIG. 1 is an axial sectional view of a cartridge with the bottom wad of the present invention
  • FIG. 2 is a cross-section axial view of an embodiment of the cylindrical plastic portion
  • FIG. 3 is a cross-sectional axial view of another embodiment of the cylindrical plastic portion
  • the shot cartridge case includes a plastic tube 1 and a cylindrical plastic portion 2 provided in the rear end thereof.
  • a recess 3 which is defined by an annular wall 11 and an end wall 12 of the plastic portion 2 and which is provided with annular grooves 4, the bottom wad 5, which consists of, for example, cardboard, is accommodated.
  • Portion 2 and plug 5 have a common central, axial perforation 6 for receiving primer.
  • the front zone of part 2 is provided with the recess 7 to receive the powder, and the shape of this recess is selected so that the elastic annular lip 8 is formed at the front end of portion 2 to afford the advantage of a particularly good seal between the tube 1 and the portion 2 against the powder gases after the firing of a shot.
  • a bottom capsule 9 which is manufactured from a material of a high strength, especially a metal.
  • the assembly of the individual components can be executed in various ways, such as, for example, first the bottom wad 5 is introduced into the recess 3 of the cylindrical plastic portion 2 and then both of these components are inserted together in the rear end of the plastic tube case 1, whereupon the bottom cap 9 is inverted over the rear end of the tube 1 and all the parts are pressed together so that the wad 5 is pressed into the annular grooves 4 of portion 2 and the tube 1 as well as the portion 2 are deformed at the rear end in the desired manner and finally, the bottom cap 9 obtains the illustrated configuration in the zone of the central perforation 6.
  • the form of the cylindrical plastic portion 2 shown in FIG. 2 corresponds to that of the cartridge of FIG. 1.
  • the front recess 7 for receiving the powder is constructed, in addition to the consideration of the re- 1 quirements of the cartridge to be produced with respect to the internal ballistics thereof, in such a manner that the annular lip 8 is formed at the front end.
  • the rear recess 3 for the reception of the bottom wad is provided with the annular grooves 4 or, in place of these grooves 4, it is also possible to provide differently shaped and designed grooves or the like such as, for example, a helical groove.
  • the plastic portion 2 of FIG. 3 differs from that of FIG. 2 by the somewhat different design of the front zone.
  • the front recess 7 is constructed, again taking into consideration the requirements for the cartridge to be manufactured from the viewpoint of internal ballistics, in such a manner that the annular support surface 10 is formed at the front end for supporting an intermediate substance or the like.
  • the design of FIG. 2 is especially suitable for powder types which are to be loaded under pressure
  • the embodiment of FIG. 3 can be advantageously employed also when using pure nitrocellulose powders.
  • the bottom wad 5 of FIG. 4 which can be made, for example, of cardboard and provided with the continuous central bore 6 has a larger axial extension than the recess 3 of the portions 2 of FIGS. 2 and 3.
  • this axial extension is dimensioned so that the wad adapts itself with an exact fit to the recess 3 during the subsequent axial pressing operation under a simultaneous, corresponding enlargement in its radial dimensions and penetration into the annular grooves 4 of portion 2.
  • plastic tube 1 of FIG. 5 and the bottom cap 9 of FIG. 6, both of which are shown only for the sake of completeness, are designed and dimensioned in correspondence with the respective practical requirements, especially in adaptation to the bottom plug, so that the respectively desired properties of the cartridge to be produced are attained.
  • Bottom wad for cartridge cases comprising a cylindrical portion defining a front recess for the accommodation of a powder charge and a rear recess, and a cylindrical plug of a relatively hard material selected from the group consisting of cardboard, fibrous material and a mineral substance inserted in the rear recess of the cylindrical portion, the rear recess being defined by an annular wall and an end wall, said cylindrical plug abutting only along the annular wall and end wall defining the rear recess.
  • thermoplastic synthetic material is polyethylene

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Dry Development In Electrophotography (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Closures For Containers (AREA)
  • Buffer Packaging (AREA)
US00094329A 1969-12-02 1970-12-02 Bottom wad for cartridge cases, especially shot cartridge cases Expired - Lifetime US3756156A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691960355 DE1960355C3 (de) 1969-12-02 Bodenpfropfen für Patronenhülsen, insbesondere Schrotpatronenhülsen

Publications (1)

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US3756156A true US3756156A (en) 1973-09-04

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US00094329A Expired - Lifetime US3756156A (en) 1969-12-02 1970-12-02 Bottom wad for cartridge cases, especially shot cartridge cases

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US (1) US3756156A (enExample)
FR (1) FR2072734A5 (enExample)
GB (1) GB1271469A (enExample)

Cited By (99)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020763A (en) * 1975-04-29 1977-05-03 Antonio Iruretagoyena Cartridge construction
US4332766A (en) * 1980-02-01 1982-06-01 Federal Cartridge Corporation One-piece shotshell
US4481885A (en) * 1980-02-01 1984-11-13 Federal Cartridge Corporation One-piece shotshell
US4509428A (en) * 1981-01-16 1985-04-09 Federal Cartridge Corporation Shotshell casing with partially telescoped basewad
US4532175A (en) * 1983-08-22 1985-07-30 Corning Glass Works Collector membrane
US4569288A (en) * 1983-07-05 1986-02-11 Olin Corporation Plastic cartridge case
US5988070A (en) * 1996-05-04 1999-11-23 Rheinmetall W & M Gmbh Plasma injection device for an electrothermal gun
US8156870B2 (en) 2008-06-12 2012-04-17 The United States Of America As Represented By The Secretary Of The Army Lightweight cartridge case
US20160245626A1 (en) * 2014-11-14 2016-08-25 Alcoa Inc. Aluminum shotgun shell case, methods of making, and using the same
US9506735B1 (en) * 2016-03-09 2016-11-29 True Velocity, Inc. Method of making polymer ammunition cartridges having a two-piece primer insert
US9513096B2 (en) 2010-11-10 2016-12-06 True Velocity, Inc. Method of making a polymer ammunition cartridge casing
US9518810B1 (en) * 2016-03-09 2016-12-13 True Velocity, Inc. Polymer ammunition cartridge having a two-piece primer insert
US9523563B1 (en) * 2016-03-09 2016-12-20 True Velocity, Inc. Method of making ammunition having a two-piece primer insert
US9551557B1 (en) * 2016-03-09 2017-01-24 True Velocity, Inc. Polymer ammunition having a two-piece primer insert
US9587918B1 (en) 2015-09-24 2017-03-07 True Velocity, Inc. Ammunition having a projectile made by metal injection molding
US9835423B2 (en) 2010-11-10 2017-12-05 True Velocity, Inc. Polymer ammunition having a wicking texturing
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
USD813975S1 (en) * 2015-08-05 2018-03-27 Mark White Low volume subsonic bullet cartridge case
US10041770B2 (en) 2010-11-10 2018-08-07 True Velocity, Inc. Metal injection molded ammunition cartridge
US10048049B2 (en) 2010-11-10 2018-08-14 True Velocity, Inc. Lightweight polymer ammunition cartridge having a primer diffuser
US10048052B2 (en) 2010-11-10 2018-08-14 True Velocity, Inc. Method of making a polymeric subsonic ammunition cartridge
US10081057B2 (en) 2010-11-10 2018-09-25 True Velocity, Inc. Method of making a projectile by metal injection molding
US20190011231A1 (en) * 2015-09-18 2019-01-10 Baschieri & Pellagri S.P.A. Method for making cases for firearms
US10190857B2 (en) 2010-11-10 2019-01-29 True Velocity Ip Holdings, Llc Method of making polymeric subsonic ammunition
US10365074B2 (en) 2017-11-09 2019-07-30 True Velocity Ip Holdings, Llc Multi-piece polymer ammunition cartridge
US10408592B2 (en) 2010-11-10 2019-09-10 True Velocity Ip Holdings, Llc One piece polymer ammunition cartridge having a primer insert and methods of making the same
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US10429156B2 (en) 2010-11-10 2019-10-01 True Velocity Ip Holdings, Llc Subsonic polymeric ammunition cartridge
US10480915B2 (en) 2010-11-10 2019-11-19 True Velocity Ip Holdings, Llc Method of making a polymeric subsonic ammunition cartridge
US10591260B2 (en) 2010-11-10 2020-03-17 True Velocity Ip Holdings, Llc Polymer ammunition having a projectile made by metal injection molding
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US10704872B1 (en) 2019-02-14 2020-07-07 True Velocity Ip Holdings, Llc Polymer ammunition and cartridge having a convex primer insert
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US10921106B2 (en) 2019-02-14 2021-02-16 True Velocity Ip Holdings, Llc Polymer ammunition and cartridge having a convex primer insert
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US11067370B2 (en) 2018-01-21 2021-07-20 Sig Sauer, Inc. Multi-piece cartridge casing and method of making
US11118875B1 (en) 2010-11-10 2021-09-14 True Velocity Ip Holdings, Llc Color coded polymer ammunition cartridge
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US11215430B2 (en) 2010-11-10 2022-01-04 True Velocity Ip Holdings, Llc One piece polymer ammunition cartridge having a primer insert and methods of making the same
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US11248885B2 (en) 2010-11-10 2022-02-15 True Velocity Ip Holdings, Llc Subsonic polymeric ammunition cartridge
US11293732B2 (en) 2010-11-10 2022-04-05 True Velocity Ip Holdings, Llc Method of making polymeric subsonic ammunition
US11300393B2 (en) 2010-11-10 2022-04-12 True Velocity Ip Holdings, Llc Polymer ammunition having a MIM primer insert
US11313654B2 (en) 2010-11-10 2022-04-26 True Velocity Ip Holdings, Llc Polymer ammunition having a projectile made by metal injection molding
US11340053B2 (en) 2019-03-19 2022-05-24 True Velocity Ip Holdings, Llc Methods and devices metering and compacting explosive powders
US11435171B2 (en) 2018-02-14 2022-09-06 True Velocity Ip Holdings, Llc Device and method of determining the force required to remove a projectile from an ammunition cartridge
US11543218B2 (en) 2019-07-16 2023-01-03 True Velocity Ip Holdings, Llc Polymer ammunition having an alignment aid, cartridge and method of making the same
US11614314B2 (en) 2018-07-06 2023-03-28 True Velocity Ip Holdings, Llc Three-piece primer insert for polymer ammunition
US11733015B2 (en) 2018-07-06 2023-08-22 True Velocity Ip Holdings, Llc Multi-piece primer insert for polymer ammunition
US12066279B2 (en) 2022-05-06 2024-08-20 Innovative Performance Applications, Llc Polymer ammunition casing

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DE2832879A1 (de) * 1978-07-27 1980-02-14 Dynamit Nobel Ag Treibladungsanzuender

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Cited By (224)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020763A (en) * 1975-04-29 1977-05-03 Antonio Iruretagoyena Cartridge construction
US4332766A (en) * 1980-02-01 1982-06-01 Federal Cartridge Corporation One-piece shotshell
US4481885A (en) * 1980-02-01 1984-11-13 Federal Cartridge Corporation One-piece shotshell
US4509428A (en) * 1981-01-16 1985-04-09 Federal Cartridge Corporation Shotshell casing with partially telescoped basewad
US4569288A (en) * 1983-07-05 1986-02-11 Olin Corporation Plastic cartridge case
US4532175A (en) * 1983-08-22 1985-07-30 Corning Glass Works Collector membrane
US5988070A (en) * 1996-05-04 1999-11-23 Rheinmetall W & M Gmbh Plasma injection device for an electrothermal gun
US8156870B2 (en) 2008-06-12 2012-04-17 The United States Of America As Represented By The Secretary Of The Army Lightweight cartridge case
US10704877B2 (en) 2010-11-10 2020-07-07 True Velocity Ip Holdings, Llc One piece polymer ammunition cartridge having a primer insert and methods of making the same
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US11821722B2 (en) 2010-11-10 2023-11-21 True Velocity Ip Holdings, Llc Diffuser for polymer ammunition cartridges
US11733010B2 (en) 2010-11-10 2023-08-22 True Velocity Ip Holdings, Llc Method of making a metal injection molded ammunition cartridge
US9631907B2 (en) 2010-11-10 2017-04-25 True Velocity, Inc. Polymer ammunition cartridge having a wicking texturing
US9835423B2 (en) 2010-11-10 2017-12-05 True Velocity, Inc. Polymer ammunition having a wicking texturing
US11719519B2 (en) 2010-11-10 2023-08-08 True Velocity Ip Holdings, Llc Subsonic polymeric ammunition with diffuser
US11614310B2 (en) 2010-11-10 2023-03-28 True Velocity Ip Holdings, Llc Metal injection molded ammunition cartridge
US9927219B2 (en) 2010-11-10 2018-03-27 True Velocity, Inc. Primer insert for a polymer ammunition cartridge casing
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US9933241B2 (en) 2010-11-10 2018-04-03 True Velocity, Inc. Method of making a primer insert for use in polymer ammunition
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US11454479B2 (en) 2010-11-10 2022-09-27 True Velocity Ip Holdings, Llc Subsonic polymeric ammunition
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US10048049B2 (en) 2010-11-10 2018-08-14 True Velocity, Inc. Lightweight polymer ammunition cartridge having a primer diffuser
US10048052B2 (en) 2010-11-10 2018-08-14 True Velocity, Inc. Method of making a polymeric subsonic ammunition cartridge
US11340050B2 (en) 2010-11-10 2022-05-24 True Velocity Ip Holdings, Llc Subsonic polymeric ammunition cartridge
US11340049B2 (en) 2010-11-10 2022-05-24 True Velocity Ip Holdings, Llc Method of making a metal primer insert by injection molding
US10081057B2 (en) 2010-11-10 2018-09-25 True Velocity, Inc. Method of making a projectile by metal injection molding
US11333469B2 (en) 2010-11-10 2022-05-17 True Velocity Ip Holdings, Llc Polymer ammunition and cartridge primer insert
US11333470B2 (en) 2010-11-10 2022-05-17 True Velocity Ip Holdings, Llc Polymer ammunition and cartridge primer insert
US10145662B2 (en) 2010-11-10 2018-12-04 True Velocity Ip Holdings, Llc Method of making polymer ammunition having a metal injection molded primer insert
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Also Published As

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DE1960355A1 (de) 1971-06-09
FR2072734A5 (enExample) 1971-09-24
DE1960355B2 (de) 1976-01-02
GB1271469A (en) 1972-04-19

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