US3638571A - Recoilless practice cartridge - Google Patents

Recoilless practice cartridge Download PDF

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Publication number
US3638571A
US3638571A US757902A US3638571DA US3638571A US 3638571 A US3638571 A US 3638571A US 757902 A US757902 A US 757902A US 3638571D A US3638571D A US 3638571DA US 3638571 A US3638571 A US 3638571A
Authority
US
United States
Prior art keywords
bore
bottom piece
projectile
cartridge
practice
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
US757902A
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English (en)
Inventor
Heinz Gawlick
Rudolf Stahlmann
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
Original Assignee
Dynamit Nobel AG
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 Dynamit Nobel AG filed Critical Dynamit Nobel AG
Application granted granted Critical
Publication of US3638571A publication Critical patent/US3638571A/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
    • F42B8/00—Practice or training ammunition
    • F42B8/12—Projectiles or missiles
    • F42B8/20—Mortar grenades

Definitions

  • a dummy projectile having the external shape of the live, self-propelling projectile has a subcaliber barrel for firing the practice subcaliber ammunition.
  • An additional charge is provided at the rear of the subcaliber case threadedly engaging the dummy projectile and in a special casing disposed externally of the dummy projectile for ejecting the dummy projectile from the firearm in the firing direction.
  • the present invention relates to the firing of a subcaliber practice projectile from recoilless firearms.
  • the present invention 'employs a subcaliber barrel insert disposed in the firearm and provided with a practice cartridge chamber formed at its rear end; that is, the present invention does not employ a dummy projectile resembling the live ammunition.
  • the present invention employs a practice cartridge having a tail-stabilized projectile disposed therein.
  • the projectile is provided with a central axially extending bore opening rearwardly and in communication at its front end, by means of radial bores, with the propellant charge behind the head of the projectile and around the projectile tail section.
  • the bottom of the cartridge case extends rearwardly and is provided with at least one bore aligned with the projectile axial bore for transferring ignition from a detonator received within the bottom piece.
  • the bottom piece has a further bore branching off from its first-mentioned bore to receivethe detonator.
  • the barrel insert is of such a construction that its cartridge chamber allows the bottom piece of the practice cartridge to extend the chamber in the rearward direction.
  • the ignition jet first proceeds from the bottom piece through the axial bore of the projectile and, by way of the radial channels, into the propellant charge chamber to ignite the propellant charge.
  • the projectile of the cartridge is set into motion, that is, driven forwardly out of the cartridge case and barrel insert. Simultaneously, a portion of the propellant gases flows rearwardly and escapes rearwardly through the bore or bores in the bottom piece of the practice cartridge case.
  • any recoil of the firearm is negligible or avoided completely.
  • the absence of recoil is desirable not only for simulating the firing of live ammunition in a recoilless rifle, but also with respect to safety because of sights disposed directly in front of the eyes of the person firing the firearm.
  • the rearward flash of the propellant gases exiting through the rear end of the firearm serves the useful purpose of drawing the shooter's attention to the danger of rearwardly projecting gases, which danger is considerably greater with the firing of live ammunition.
  • the bore of the cartridge case bottom piece serving for the recoil escape of the propellant gases is provided with a tamping means to resist escape at least until a predetermined pressure has been reached.
  • a tamping means to resist escape at least until a predetermined pressure has been reached.
  • the present invention employs one or more branched bores with a destructible tamping ring thereover on the outside.
  • these additional branched bores are provided radially so that the escaping propellant gases will impinge on the barrel of the firearm and thereafter flow rearwardly without any danger.
  • extension of the bottom piece of the cartridge case is particularly desirable to construct the extension of the bottom piece of the cartridge case as a separate component and to secure the bottom piece through the remainder of the cartridge case by a threaded portion.
  • the extension or bottom piece may be reused with a new cartridge case, by inserting a new detonator and optionally, attaching a new tamping ring, if the old case should not be reusable. Also, such a construction simplifies the manufacture of the practice cartridge case.
  • the present invention also provides a further embodiment wherein the bottom piece extension is provided with a lateral branched bore having therein a radially extending pin for receiving therein the detonator.
  • the pin is secured in the bottom piece by means of a central axially extending setscrew.
  • the pin will extend through lateral bores in the barrel of the firearm to fixedly secure the practice cartridge within the firearm.
  • FIG. 1 is an axial cross-sectional view taken through a practice cartridge according to the present invention
  • FIG. 2 is an axial cross-sectional view taken through the cartridge chamber of a firearm having therein the barrel insert and practice cartridge of the present invention, on a reduced scale with respect to FIG. 1', and
  • FIG. 3 is an enlarged view similar to FIG. 2, but showing a modified practice cartridge according to the present invention.
  • the recoilless practice cartridge of the present invention is provided with a projectile having a head 2, a tail 3 and stabilizing rear fins 4, which projectile is received within the generally tubular practice cartridge case 1.
  • the practice cartridge case 1 is provided with a bottom piece having a rearward extension 6, which is threadedly received within the rear end 5 of the remainder of the cartridge case.
  • the projectile is provided with a rearwardly opening central axially extending bore 7 aligned with the central axially extending bore 8 in the bottom piece 6.
  • the radial bores 9 are tamped on the outside by means of a ring 11, preferably of synthetic material.
  • the front end of the tail section 3 of the projectile is provided with radially extending bores 12, which provide communicationbetween the central bore 7 and the propellant charge chamber 13 directly adjacent the annular propellant charge 14 disposed around the tail section 3 directly behind the head 2.
  • the propellant charge 14 is rearwardly tamped by means of an annular plate 20 secured to the projectile by means of a tongue and groove connection.
  • the desired center of gravity is accurately obtained by means of the insert 19 in the head 2 of the projectile.
  • the practice cartridge according to FIG. 1 is shown in the cartridge chamber 26 of the barrel insert 25.
  • the practice cartridge has an annular collar 21 provided on the extension of the bottom piece 6 to engage the annular shoulder 22 of the barrel insert 25, which insert 25 is fixedly secured with the barrel 24 of the firearm cartridge chamber by means of a spacer ring 23.
  • the extension 6, although free, is disposed along its entire length within the barrel 24 of the firearm.
  • the ignition jet produced by the detonator 10 will travel from the bore 8 through the bore 7 axially and radially through the bores 12 to ignite the propellant charge 14.
  • a satisfactory ignition of the propellant charge 14 is obtained within the restricted propellant charge chamber because of the tamping annular plate 20.
  • the tamping plate is destroyed so that the propellant gases may occupy the entire space or chamber formed rearwardly of the head 2 between the projectile and the cartridge case 1.
  • the projectile will be set into motion with respect to the cartridge case 1.
  • the signaling charge with its detonating device and lock in the head 2 of the projectile is not a specific part of the present invention and is therefore not described in great detail.
  • the head 2 may carry instruments or other charges, for example a tracer or flare charge; particularly, the tracer or flare charge may be provided in the front portion of the bore 7 of the projectile so that after the tracer charge has been ignited it will either remain in place or slide due to the acceleration of the practice projectile up to an abutment at the tail end where it will be held by means of air flowing into the bore 7 through the radial bores 12 during flight of the projectile.
  • the bottom piece of the practice projectile may-be modified by providing a radial bore in the extension of the bottom piece 6 for receiving therein a radially extending pin 29.
  • the pin 29 will project on both sides through radial bores 30 in the barrel 24 of the firearm to fixedly secure the practice projectile within the firearm.
  • a bore 31 is provided radially within the pin 29 and receives therein a detonator 10.
  • the pin is securely positioned by means of its annular shoulder 32 engaging a similarly formed portion of the bottom piece extension 6, or vice versa, and by means of an axially extending setscrew 33.
  • An additional detonator or booster 34 is provided within the bore 8 of the bottom piece extension 6, which additional detonator 34 is ignited by means of the detonator l0, and in turn will ignite the propellant charge 14.
  • a spacer ring 35 is provided between an annular flange of the firearm barrel 24 and the pin 29, to reinforce the wall of the barrel 24 and support the pin 29 with respect to the rear end of the firearm.
  • a practice cartridge insertable in a cartridge chamber for firing from a subcaliber barrel insert of recoilless firearm comprising: a generally tubular practice cartridge case; a practice projectile axially received within said cartridge case; said practice projectile having an axially extending, rearwardly opening, generally central bore; said practice projectile having a head engaging with said cartridge case to provide a propellant gas expansion chamber between said cartridge case and said practice projectile rearwardly of said head; a propellant charge within said propellant gas expansion chamber; a destructible annular plate being provided in the cartridge case for rearwardly supporting said propellant charge on the head side of said practice projectile; said practice projectile having radial passage means providing gas communication between said projectile bore and said projectile charge; said cartridge case having a bottom piece at its rear end longitudinally spaced from said annular plate and provided with second passage means disposed therein in such a manner that, after the practice cartridge has been inserted in the cartridge chamber, the second passage means are located outside of the cartridge chamber for conducting propellant gases produced by ignition of said
  • said cartridge case includes a tubular sidewall portion with an interiorly threaded rear end, and said bottom piece having a front portion exteriorly threaded into said tubular sidewall portion rear end.
  • said second passage means includes a central axially extending bottom piece bore aligned with said projectile axially extending bore, and an additional bore radially extending between said bottom piece bore and the exterior of said bottom piece; said detonator means being received within said bottom piece axially extending bore; and tamping means exteriorly covering said additional bore to retard the flow of propellant gases radially through said additional bore only until a predetermined propellant gas pressure is obtained that is substantially less than the maximum propellant gas pressure.
  • said bottom piece including a radially extending bore; a radially extending pin received within said bottom piece radially extending bore and being provided with a radial bore partially forming said second passage means; said detonator means being mounted in said pin radial bore.
  • said second passage means includes a central axially extending bottom piece bore aligned with said projectile axially extending bore, and an additional bore radially extending between said bottom piece bore and the exterior of said bottom piece; said detonator means being received within said bottom piece axially ex tending bore; and tamping means exteriorly covering said additional bore to retard the flow of propellant gases radially through said additional bore only until a predetermined propellant gas pressure is obtained that is substantially less than the maximum propellant gas pressure.
  • said bottom piece including a radially extending bore; a radially extending pin received within said bottom piece radially extending bore and being provided with a radial bore partially forming said second passage means; said detonator means being mounted in said pin radial bore.
  • said second passage means includes a central axially extending bottom piece bore aligned with said projectile axially extending bore, and an additional bore radially extending between said bottom piece bore and the exterior of said bottom piece; said detonator means being received within said bottom piece axially extending bore; and an annular synthetic tamping ring exteriorly covering said additional bore to retard the flow of propellant gases radially through said additional bore only until a predetermined propellant gas pressure is obtained that is substantially less than the maximum propellant gas pressure.
  • said second passage means including at least one bottom piece axially extending bore aligned with said projectile bore and an additional bore branching off from said bottom piece bore; sand said detonator means being in one of said bottom piece bore and said additional bore.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US757902A 1967-09-06 1968-09-06 Recoilless practice cartridge Expired - Lifetime US3638571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED0054039 1967-09-06

Publications (1)

Publication Number Publication Date
US3638571A true US3638571A (en) 1972-02-01

Family

ID=7055439

Family Applications (1)

Application Number Title Priority Date Filing Date
US757902A Expired - Lifetime US3638571A (en) 1967-09-06 1968-09-06 Recoilless practice cartridge

Country Status (7)

Country Link
US (1) US3638571A (en(2012))
BE (1) BE720455A (en(2012))
DE (1) DE1578122A1 (en(2012))
FR (1) FR1585264A (en(2012))
GB (1) GB1240881A (en(2012))
NL (1) NL6811787A (en(2012))
NO (1) NO120975B (en(2012))

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4088056A (en) * 1976-01-20 1978-05-09 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Defence Gas initiated cartridges
WO1985001341A1 (en) * 1983-09-13 1985-03-28 The Commonwealth Of Australia Care Of The Secretar Sub-calibre training device
US4543885A (en) * 1982-04-01 1985-10-01 Forenade Fabriksverken Increment charge for a finned projectile
US4899660A (en) * 1988-04-11 1990-02-13 Rainier International, Inc. Training round for firearm
US5189250A (en) * 1988-10-05 1993-02-23 Frag, Ltd. Projectile for smooth bore weapon
WO1998055820A1 (en) * 1997-06-05 1998-12-10 Simbal Ab Training weapon system
US7421934B1 (en) * 2005-09-01 2008-09-09 The United States Of America As Represented By The Secretary Of The Army Mortar tube for training

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136935B (en) * 1983-03-26 1986-11-19 Hilton Gun Co Firearms
DE3321233C2 (de) * 1983-06-11 1986-01-30 Mauser-Werke Oberndorf Gmbh, 7238 Oberndorf Gasdichter Verschluß zwischen Adaptionspatrone und Einsteckrohr
DE3642414A1 (de) * 1986-12-11 1988-06-23 Feistel Pyrotech Fab Uebungspatrone fuer rueckstossfreie abwehrwaffen
DE9100116U1 (de) * 1991-01-07 1991-06-06 Josef Lubig GmbH, 5300 Bonn Exerziergranate

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674923A (en) * 1951-07-31 1954-04-13 Energa Instruction device
US2793590A (en) * 1952-04-05 1957-05-28 Energa Practice projectile
US3211098A (en) * 1962-03-03 1965-10-12 Dynamit Nobel Ag Cartridge for practice firing
US3274935A (en) * 1963-08-13 1966-09-27 Dynamit Nobel Ag Practice ammunition

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674923A (en) * 1951-07-31 1954-04-13 Energa Instruction device
US2793590A (en) * 1952-04-05 1957-05-28 Energa Practice projectile
US3211098A (en) * 1962-03-03 1965-10-12 Dynamit Nobel Ag Cartridge for practice firing
US3274935A (en) * 1963-08-13 1966-09-27 Dynamit Nobel Ag Practice ammunition

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4088056A (en) * 1976-01-20 1978-05-09 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Defence Gas initiated cartridges
US4543885A (en) * 1982-04-01 1985-10-01 Forenade Fabriksverken Increment charge for a finned projectile
WO1985001341A1 (en) * 1983-09-13 1985-03-28 The Commonwealth Of Australia Care Of The Secretar Sub-calibre training device
US4899660A (en) * 1988-04-11 1990-02-13 Rainier International, Inc. Training round for firearm
US5189250A (en) * 1988-10-05 1993-02-23 Frag, Ltd. Projectile for smooth bore weapon
WO1998055820A1 (en) * 1997-06-05 1998-12-10 Simbal Ab Training weapon system
US7421934B1 (en) * 2005-09-01 2008-09-09 The United States Of America As Represented By The Secretary Of The Army Mortar tube for training

Also Published As

Publication number Publication date
GB1240881A (en) 1971-07-28
BE720455A (en(2012)) 1969-02-17
NL6811787A (en(2012)) 1969-03-10
DE1578122A1 (de) 1971-10-07
NO120975B (en(2012)) 1970-12-28
FR1585264A (en(2012)) 1970-01-16

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