US3882778A - Blank cartridge for training purposes - Google Patents

Blank cartridge for training purposes Download PDF

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Publication number
US3882778A
US3882778A US343186A US34318673A US3882778A US 3882778 A US3882778 A US 3882778A US 343186 A US343186 A US 343186A US 34318673 A US34318673 A US 34318673A US 3882778 A US3882778 A US 3882778A
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United States
Prior art keywords
case
longitudinal
grooves
cartridge according
blank cartridge
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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
US343186A
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English (en)
Inventor
Heinz Gawlick
Rudolf Stahlmann
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Dynamit Nobel AG
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Dynamit Nobel AG
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Publication date
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
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Publication of US3882778A publication Critical patent/US3882778A/en
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    • 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
    • F42B8/02—Cartridges
    • F42B8/04—Blank cartridges, i.e. primed cartridges without projectile but containing an explosive or combustible powder charge

Definitions

  • ABSTRACT A blank cartridge for training purposes in the form of an elongated case made of thermoplastic synthetic resin and forming a hollow simulated projectile and a powder chamber.
  • the case is provided with weakening lines for providing a predetermined rupturing of the case in the form of external longitudinal grooves or slots extending from the tip of the simulated projectile over substantially the entire length of the projectile.
  • the powder chamber is provided with a powder charge mass of at least 10 g. and internal longitudinal grooves may also be provided.
  • the present invention relates to a blank cartridge for training purposes having a case of a thermoplastic syn thetic resin forming a powder chamber and a hollow simulated projectile.
  • the cartridge being provided at the tip with defined weakening or rupturing lines. and enclosing a powder charge mass of at least ltl g.
  • the backup of the powder gases in the training cartridge causes a correspondingly great pressure stress on the simulated projectile, which latter is thereby often torn partially or even completely from the remaining portion of the case.
  • Such an uncontrolled destruction of the training cartridge can. however. not be tolerated in practice. since. in view of the case residues remaining in the cartridge chamber, a subsequent training cartridge can no longer be satisfactorily loaded into the firearm in some cases.
  • the automatic firing sequence of the firearm is interrupted and a correspondingly cumbersome and timeconsuming cleaning of the firearm is necessary.
  • the present invention has as an object thereof the avoiding of the above-described disadvantages of the conventional blank training cartridge with a case made of a thermoplastic synthetic resin having a powder chamber and a hollow simulated projectile provided at the tip with defined weakening lines. wherein the mass of the enclosed powder charge is at least It) g.
  • weakening lines are formed as external longitudinal grooves cmanating from the tip and extending at least substantially over the entire simulated projectile.
  • the simulated projectile is ruptured in a defined manner in the longitudinal grooves. i.c.. it is disintegrated into strips of a predetermined shape and predetermined dimensions. which strips remain connected with the other portions of the case with their rear ends.
  • the thus-obtained long exhaust slots make it possible for the powder gases to escape quickly in an advantageous manner so that. on the one hand. the operation ofthc automatic mechanism of the firearm is ensured and. on the other hand. a quick pressure relief of the simulated projectile is obtained and thus the danger of the detachment of more or less large sections of the simulated projectile is avoided.
  • the cartridge case is additionally provided as is known in a conventional manner with a case shoulder and a case neck between the case shank proper. which essentially forms the powder chamber. and the simulated projectile.
  • the external longitudinal grooves are extended over the case neck up to the region of and in close proximity with the case shoulder so as to provide an even more rapid escape of the powder gases as is desirable in individual cases.
  • the simulated projectile is additionally provided with internal longitudinal grooves extending at least substantially over its entire length and optionally also over the case neck in the proximity of the case shoulder. This is provided. for example. in order to advantageously influence the stress distribution in the simulated projectile caused by the manufacturing process wherein the plastic case is produced according to the injection molding method. in the direction toward an optimum mechanical strcss-bcaring capacity of the simulated projectile.
  • the internal longitudinal grooves past the case neck into the zone of the case shoulder.
  • the additional advantage is obtained that the case shoulder under the pressure effect of the powder gases present in the case is pressed more strongly against the corresponding wall portion of the cartridge chamber of the firearm, whereby the rearward sealing of the cartridge chamber. i.e.. in the direction toward the breech. is desirably improved and the undesired cscape of the powder gases toward the rear is reduced.
  • the external and internal longitudinal grooves can be formed of the same or also of a differing cross section.
  • the grooves can be disposed. for example. as seen in cross section. in opposition to each other in such a manner that the bridge remaining between the two grooves is disposed exactly in the center of the wall of the simulated projectile.
  • the external and internal longitudinal grooves. as seen in cross section. can instead be disposed so that they are in alternating succession about the case wall.
  • a similar effect can be attained.
  • a deep groove and a shallow groove, or also a deep groove and two shallow grooves succeed one another alternatingly at mutual spacings.
  • the deep grooves act as predetermined disintegrating or rupturing lines, while the shallow grooves again enhance the deformability of the remaining strips of material and thus the pressing thereof against the wall of the cartridge chamber.
  • the shallow external grooves have the additional effect that the contact surface of the remaining strips of material with the wall of the cartridge chamber is reduced and accordingly, the extraction of the fired cartridge, which is still under an internal excess pressure, out of the cartridge chamber is fa cilitated.
  • an additional longitudinal notch is provided at the web at the base of the groove, preferably along one of its two longitudinal edges, so that the web, the width of which for manufacturing reasons can be reduced to below a certain minimum amount only with difficulties, does not tear apart somewhere in an uncontrolled manner, but rather is torn off under the effect of the powder gases at one of its longitudinal edges and is then flipped toward the outside about the other longitudinal edge.
  • the additional longitudinal notch can be provided in the external and/or internal longitudinal grooves.
  • especially advantageous conditions are generally attained by providing at least 6 and at most 12 external longitudinal grooves acting as predetermined rupturing lines, wherein the total width of all longitudinal grooves, measured on the outer surface and optionally the inner surface of the simulated projectile, is suitably about 60% of the length of the outer circumference of the simulated projectile.
  • the thickness of the connecting web at the bottom of the longitudinal grooves effective as predetermined rupturing lines must not be too large, on the one hand, in order to obtain the desired rupturing effect. On the other hand, this thickness must not be chosen to be too small, either, in order to exclude an unintended rupturing due to inherent stresses, for example during storage of the training cartridge.
  • a web thickness of about 0.3 0.6 mm. has proved to be advantageous.
  • these strips can be formed, together with the adjoining case zone, with an enlarged, for example doubled, wall thickness as compared to the normal case, so that after firing, the external shape of the cartridge case including the simulated projectile is unchanged.
  • FIG. 1 shows, in the left and right-hand portions thereof respectively, a plan view and a longitudinal sectional view of the front end of a blank cartridge for training purposes in accordance with the present invention
  • FIGS. Za-Zg show different cross-sectional shapes of the simulated projectile
  • FIG. 3 shows a fragmentary cross-sectional view of the wall of a simulated projectile
  • FIG. 4 shows a fragmentary cross-sectional view of the wall of a simulated projectile with a longitudinal slot.
  • FIG. 1 the case of a blank cartridge for training purposes in accordance with the present invention and which includes a simulated projectile l, a neck portion 2, a shoulder portion 3, and a shank portion 4.
  • the simulated projectile l is provided with external longitudinal grooves 5 extending over the case neck 2 up to the region of the case shoulder 3.
  • An internal longitudinal groove 6 is also provided and is indicated by the dashed line and extends approximately from the tip of the simulated projectile 1 up to the zone of the case shoulder 3.
  • the blank training cartridge furthermore includes an outer metal sleeve 7 contacting the case shoulder 3 via a metal ring 8 serving as an abutment.
  • an inner case portion 9 forming a powder chamber for receiving the powder charge, not shown.
  • FIG. 2a which illustrates the crosssectional shape of the simulated projectile l
  • the external longitudinal grooves 5 and the internal longitudinal grooves 6 have differing cross-sectional configurations and a web 10 is disposed approximately in the center of the wall of the simulated projectile 1.
  • FIG. 2b shows a configuration wherein shallow external longitudinal grooves 12 are provided in addition to the deep external longitudinal grooves ll.
  • the external grooves 11 are effective as actual predetermined rupturing lines, whereas the external longitudinal grooves 12, together with the internal longitudinal grooves 6, effect on the one hand, an easier deformability of the strips of material 13 and thus an improved obturation, and generally are not ruptured.
  • the extraction of the fired cartridge from its chamber is facilitated.
  • FIG. 20 shows a cross-sectional shape of maximum simplicity, with 6 external longitudinal grooves 11 effective as predetermined rupturing lines. and a smooth inner surface.
  • FIG. 2d shows a modification of FIG. 2: with twice the number of external longitudinal grooves 11, i.e., 12 grooves II and a smooth inner surface.
  • the wall of the simulated projectile is provided with external longitudinal grooves ll effective as predetermined rupturing lines, and the internal longitudinal grooves 6 are disposed respectively between adjacent external grooves, effecting the desired ready deformability of the strip 13 of material.
  • FIGS. 2f and 2g show a cross-sectional configuration with external and internal longitudinal grooves 5 and 6 of identical shape, wherein the web is arranged in the center of the wall of the simulated projectile 1.
  • FIG. 2f an embodiment is shown having 6 predetermined rupturing lines, while in FIG. 2g there is shown a modification with l2 predetermined rupturing lines.
  • FIG. 3 shows a fragmentary cross-sectional configuration of another embodiment of the present invention wherein a longitudinal notch 14 is provided at a longitudinal edge of the web 10 and
  • FIG. 4 shows an embodiment wherein a longitudinal slot 15 is provided in place of the longitudinal grooves 11.
  • Blank cartridge for training purposes comprising an elongated case of thermoplastic synthetic resin, said case forming an elongated hollow simulated projectile and a powder chamber, longitudinal extending rupturing means provided in the wall of said case and extending from the tip of said simulated projectile over at least substantially the entire length of said simulated projectile, said rupturing means being rupturable along the length thereof in response to a predetermined internal gas pressure, and longitudinal extending weakening means provided in the wall of said case for enhancing the deformability of said case, said weakening means being constructed so that the wall portion provided with said weakening means remains intact at the predetermined gas pressure.
  • Blank cartridge according to claim 1, wherein said rupturing means includes a plurality of spaced external longitudinal rupturing grooves in the external wall of said case.
  • Blank cartridge according to claim 2 further cornprising a powder charge mass of at least 10 g. provided in said powder chamber.
  • Blank cartridge according to claim 3 wherein said case includes a case shoulder portion, a case neck portion and a case shank portion, said case shoulder portion and case neck portion being arranged between said case shank portion and said simulated projectile, said external longitudinal grooves extending from said simulated projectile over said case neck portion and into close proximity with said case shoulder portion.
  • Blank cartridge according to claim 4 wherein said weakening means includes a plurality of spaced longitudinal extending weakening grooves in the internal wall of said case and extending at least substantially over the entire length of said simulated projectile.
  • Blank cartridge according to claim 4 wherein said external longitudinal rupturing grooves are provided with two longitudinal edge portions terminating in a base portion, said base portion forming a web extending between said two longitudinal edge portions, and a longitudinal extending notch being provided in said web portion adjacent one of said two longitudinal edge portions of said grooves.
  • said weakening means includes a plurality of spaced longitudinal extending weakening grooves provided in the internal wall of said case extending at least substantially over the entire length of said simulated projectile.
  • Blank cartridge according to claim 2 wherein said case includes a case shoulder portion, a case neck portion and a case shank portion, said case shoulder portion and case neck portion being arranged between said case shank portion andsaid simulated projectile, said external longitudinal rupturing grooves extending from said simulated projectile over said case neck portion and into close proximity with said case shoulder portion.
  • Blank cartridge according to claim 12 wherein said internal longitudinal weakening grooves extend past the case neck portion into the region of said case shoulder portion.
  • Blank cartridge according to claim 2 wherein said weakening means includes a plurality of spaced longitudinal extending weakening grooves in the internal wall of said case and extending at least substantially over the entire length of said simulated projectile.
  • Blank cartridge according to claim 14 wherein said internal longitudinal weakening grooves are disposed between adjacent external longitudinal rupturing grooves about the wall of said casing such that said external and internal longitudinal grooves are arranged in alternating succession about the wall of said casing.
  • Blank cartridge according to claim 2 wherein said external longitudinal rupturing grooves are provided with two longitudinal edge portions terminating in a base portion. said base portion forming a web ex tending between said two longitudinal edge portions. and a longitudinal extending notch being provided in said web portion adjacent one of said two longitudinal edge portions of said grooves.
  • Blank cartridge according to claim 2 wherein the total width of the external longitudinal grooves is approximately 540% of the length of the outer circumference of said simulated projectile.
  • Blank cartridge according to claim 2 wherein said external longitudinal grooves terminate in a base, said base forming a web portion in the wall of the case, said web portion having a case wall thickness of about 0.3-0.6 mm.
  • Blank cartridge according to claim 1 further comprising an elongated casing portion closed at a front end thereof and disposed within said case to form a powder chamber for receiving a powder charge.
  • said rupturing means being in the form of a plurality of spaced longitudinal slots.
  • Blank cartridge according to claim I wherein the wall of said case forming said simulated projectile is provided with portions of increased wall thickness disposed between the longitudinal extending rupturing means.
  • Blank cartridge according to claim 1 wherein said rupturing means includes in the external wall of said case a plurality of spaced external longitudinal rupturing grooves of one depth and said weakening means includes in the external wall of said case a plurality of spaced external weakening grooves of another depth.
  • Blank cartridge according to claim 1 wherein said weakening means includes a plurality of spaced longitudinal extending weakening grooves provided in the internal wall of said case extending at least substantially over the entire length of said simulated projectile.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Toys (AREA)
US343186A 1972-03-23 1973-03-21 Blank cartridge for training purposes Expired - Lifetime US3882778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2214092A DE2214092A1 (de) 1972-03-23 1972-03-23 Manoever-platzpatrone

Publications (1)

Publication Number Publication Date
US3882778A true US3882778A (en) 1975-05-13

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US343186A Expired - Lifetime US3882778A (en) 1972-03-23 1973-03-21 Blank cartridge for training purposes

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US (1) US3882778A (it)
BE (1) BE797217A (it)
DE (1) DE2214092A1 (it)
FR (1) FR2177022B1 (it)
IT (1) IT979943B (it)
NO (1) NO136319C (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565131A (en) * 1984-09-17 1986-01-21 Buchner Delmer B Cartridge assembly
US4593621A (en) * 1984-09-17 1986-06-10 Buchner Delmer B Cartridge assembly
US4681038A (en) * 1986-02-03 1987-07-21 Aerojet-General Corporation Ammunition cartridge case
US4867065A (en) * 1987-09-19 1989-09-19 Rheinmetal Gmbh Training cartridge
US5309842A (en) * 1991-10-25 1994-05-10 Wilhelm Brenneke Kg Fabrikation Von Jagdgeschossen Device for firing a diabolo form bullet from a firearm
US5841063A (en) * 1994-03-10 1998-11-24 Bofors Ab Cased ammunition
JP2009229022A (ja) * 2008-03-25 2009-10-08 Showa Kinzoku Kogyo Kk 空包
US20110016763A1 (en) * 2004-04-27 2011-01-27 Ducastel Jr Charles J Cartridge and chamber for simulated firearm
US20110072996A1 (en) * 2008-06-03 2011-03-31 Diehl Bgt Defence Gmbh & Co. Kg Propellant charge
US11976911B2 (en) 2011-01-14 2024-05-07 Pcp Tactical, Llc Polymer-based cartridge casing for subsonic ammunition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH611703A5 (en) * 1976-02-17 1979-06-15 Kupag Kunststoff Patent Verwal Cartridge for firearms, especially rifles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918868A (en) * 1955-04-30 1959-12-29 Ringdal Lars Cartridge
US3144827A (en) * 1962-11-19 1964-08-18 John T Boutwell Blank cartridge
US3410213A (en) * 1965-05-15 1968-11-12 Dynamit Nobel Ag Propellant cartridge for commerical powder driven apparatus
US3435765A (en) * 1966-04-28 1969-04-01 Dynamit Nobel Ag Cartridge

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE57806C (de) * feller & SCHOY in Beriin S., Sebastianstrafse 72 Hohles Holzgeschofs für Platzpatronen
DE92913C (it) *
NL130823C (it) * 1962-09-26

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918868A (en) * 1955-04-30 1959-12-29 Ringdal Lars Cartridge
US3144827A (en) * 1962-11-19 1964-08-18 John T Boutwell Blank cartridge
US3410213A (en) * 1965-05-15 1968-11-12 Dynamit Nobel Ag Propellant cartridge for commerical powder driven apparatus
US3435765A (en) * 1966-04-28 1969-04-01 Dynamit Nobel Ag Cartridge

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565131A (en) * 1984-09-17 1986-01-21 Buchner Delmer B Cartridge assembly
US4593621A (en) * 1984-09-17 1986-06-10 Buchner Delmer B Cartridge assembly
US4681038A (en) * 1986-02-03 1987-07-21 Aerojet-General Corporation Ammunition cartridge case
US4867065A (en) * 1987-09-19 1989-09-19 Rheinmetal Gmbh Training cartridge
US5309842A (en) * 1991-10-25 1994-05-10 Wilhelm Brenneke Kg Fabrikation Von Jagdgeschossen Device for firing a diabolo form bullet from a firearm
US5841063A (en) * 1994-03-10 1998-11-24 Bofors Ab Cased ammunition
US20110016763A1 (en) * 2004-04-27 2011-01-27 Ducastel Jr Charles J Cartridge and chamber for simulated firearm
US8430035B2 (en) * 2004-04-27 2013-04-30 Charles J. Ducastel, JR. Cartridge and chamber for simulated firearm
JP2009229022A (ja) * 2008-03-25 2009-10-08 Showa Kinzoku Kogyo Kk 空包
US20110072996A1 (en) * 2008-06-03 2011-03-31 Diehl Bgt Defence Gmbh & Co. Kg Propellant charge
US8161882B2 (en) * 2008-06-03 2012-04-24 Diehl Bgt Defense Gmbh & Co. Kg Propellant charge
US11976911B2 (en) 2011-01-14 2024-05-07 Pcp Tactical, Llc Polymer-based cartridge casing for subsonic ammunition

Also Published As

Publication number Publication date
BE797217A (fr) 1973-07-16
FR2177022B1 (it) 1977-12-30
NO136319C (no) 1977-08-17
FR2177022A1 (it) 1973-11-02
IT979943B (it) 1974-09-30
NO136319B (it) 1977-05-09
DE2214092A1 (de) 1973-09-27

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