US3213792A - Armor-piercing projectile with hard core - Google Patents

Armor-piercing projectile with hard core Download PDF

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Publication number
US3213792A
US3213792A US321451A US32145163A US3213792A US 3213792 A US3213792 A US 3213792A US 321451 A US321451 A US 321451A US 32145163 A US32145163 A US 32145163A US 3213792 A US3213792 A US 3213792A
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core
casing
projectile
armor
area
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Expired - Lifetime
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US321451A
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Grenander Per Gunnar Guldbrand
Philip Sven Emil
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Saab Bofors AB
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Bofors AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
    • F42B12/06—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type with hard or heavy core; Kinetic energy penetrators

Definitions

  • the present invention relates to an armour-piercing projectile, consisting of a case or a sleeve, containing among other things a core made of a harder material, preferably tungsten carbide.
  • the purpose of the invention is to create a projectile which has a greater armour-piercing capability at oblique angles of impact than previously known projectiles of a similar design.
  • the case of the projectile body which in the design shown is described in more detail in the Swedish Patent No. 164,- 467, consists of an outer case 1, which encloses a core 3.
  • the case 1 is moreover provided with a bottom member 2.
  • a core-supporting member 5 appropriately made of heavy metal.
  • the front end of the core 3 has the form of a hemisphere, with a radius equal to one-half of the diameter of the core.
  • the hemisphere fits articulately directly in a conical or spherical cavity in the end of the core-supporting member 5 which is directed towards the core.
  • the projectile hits the armour plate, not only with the front part of the outer case, but also with the front part 6 of the core-supporting member, and the front part of the core-supporting member 5 is then given a rotating movement around its center of gravity, directed away from the armour plate.
  • the rear part is given a movement which is directed towards the armour plate, which owing to the design mentioned is transmitted to the front part of the core 3.
  • the front part of the core 3 is thereby turned towards the armour plate, in a favourable direction, which gives it a better grip and a shorter way through the armour plate.
  • the internal volume of the projectile case is utilized in the best possible way.
  • the projectile can thus be filled with the greatest possible quantity of metal, while the articulation is retained.
  • a pre-requisite for a good effect is, further, that the outer surface of the core-supporting member, which in the design shown is conical, mainly has one-half of its cone angle smaller than the angle of impact of the projectile against the armour plate.
  • the point angle should appropriately be less than 35, in order to insure good armour-piercing capability at angles of impact of less than 30, i
  • the core 3 can also very well be divided up transversally into one or more parts, e.g., along the dividing line 7, which counteracts the propagation of cracks from the front part to the rear part at the impact.
  • Such a division also production-technically facilitates a design of the core in which the different parts can consist of different metal compositions. It is thereby possible, for instance, to obtain a suitable balance between the hardness, toughness and specific gravity of the different parts.
  • the outer case 1 can also be provided with one or more notches, on the inside or outside, e.g. according to 8. This also counteracts the propagation of cracks from the front part, when ruptured, to the rear part of the outer case 1.
  • the projectile according to the invention has proved to have excellent armour-piercing properties, which, in addition to the design described above, also seems to be due to the fact that the pre-stressing according to the Swedish Patent No. 164,467 contributes towards preventing the core from being broken up too soon.
  • An armor-piercing projectile comprising a casing having a rear portion and a forward portion, the outer wall of the casing including at least one weakened area between the rear portion and the forward portion to Weaken the casing at the transverse plane of said area, a hard core fitted in said rear casing portion, said core having at its forward end a semi-spherical portion protruding past the transverse plane of said area and into said forward portion, and a hard core support in said forward portion disposed above the transverse plane of said area, said support having in its side facing the rear portion of the casing a conical cavity, said semi-spherical core portion protruding into said cavity, the inner wall of the support defining said conical cavity being a pivot bearing for the core portion protruding into the cavity to provide a fulcrum for the forward portion upon fracturing of the casing at said area.
  • a projectile according to claim 1 wherein said core is composed of two portions, one being said semi-spherical portion and the other being substantially cylindrical, the diameters of both portions being equal.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Toys (AREA)

Description

Oct. 26, 1965 P. G. R. G. GRENANDER ETAL ARMOR-PIERCING PROJECTILE WITH HARD CORE Filed Nov. 5, 1963 DR 5 E mmw m w N M R L r H mm r R P A m M N U M 6W N 5 Y B United States Patent 3,213,792 ARMOR-PIERCING PROJECTILE WITH HARD CORE Per Gunnar Richard Guldbrand Grenander, Stockholm, and Sven Emil Philip, Nasbypark, Sweden, assignors to Aktiebolaget Bofors, Bofors, Sweden, a Swedish corporation Filed Nov. 5, 1963, Ser. No. 321,451 Claims priority, application Sweden, Nov. 20, 1962, 12,462/62 4 Claims. (Cl. 102-52) The present invention relates to an armour-piercing projectile, consisting of a case or a sleeve, containing among other things a core made of a harder material, preferably tungsten carbide.
The purpose of the invention is to create a projectile which has a greater armour-piercing capability at oblique angles of impact than previously known projectiles of a similar design.
The invention and its advantages will be described in more detail in conjunction with the attached drawing, which illustrates a design of a projectile according to the invention which has been chosen as an example. The case of the projectile body, which in the design shown is described in more detail in the Swedish Patent No. 164,- 467, consists of an outer case 1, which encloses a core 3. The case 1 is moreover provided with a bottom member 2. In front of the core there is a core-supporting member 5, appropriately made of heavy metal. The front end of the core 3 has the form of a hemisphere, with a radius equal to one-half of the diameter of the core. The hemisphere fits articulately directly in a conical or spherical cavity in the end of the core-supporting member 5 which is directed towards the core.
At an oblique angle of impact, the projectile hits the armour plate, not only with the front part of the outer case, but also with the front part 6 of the core-supporting member, and the front part of the core-supporting member 5 is then given a rotating movement around its center of gravity, directed away from the armour plate. In this Way, the rear part is given a movement which is directed towards the armour plate, which owing to the design mentioned is transmitted to the front part of the core 3. At the impact, the front part of the core 3 is thereby turned towards the armour plate, in a favourable direction, which gives it a better grip and a shorter way through the armour plate. As the front part of the core has been given the form of a hemisphere, as described above, in addition to obtaining an articulated joint, the internal volume of the projectile case is utilized in the best possible way. The projectile can thus be filled with the greatest possible quantity of metal, while the articulation is retained.
A pre-requisite for a good effect is, further, that the outer surface of the core-supporting member, which in the design shown is conical, mainly has one-half of its cone angle smaller than the angle of impact of the projectile against the armour plate. The point angle should appropriately be less than 35, in order to insure good armour-piercing capability at angles of impact of less than 30, i
The core 3 can also very well be divided up transversally into one or more parts, e.g., along the dividing line 7, which counteracts the propagation of cracks from the front part to the rear part at the impact. Such a division also production-technically facilitates a design of the core in which the different parts can consist of different metal compositions. It is thereby possible, for instance, to obtain a suitable balance between the hardness, toughness and specific gravity of the different parts.
In order to facilitate the articulation, the outer case 1 can also be provided with one or more notches, on the inside or outside, e.g. according to 8. This also counteracts the propagation of cracks from the front part, when ruptured, to the rear part of the outer case 1.
The projectile according to the invention has proved to have excellent armour-piercing properties, which, in addition to the design described above, also seems to be due to the fact that the pre-stressing according to the Swedish Patent No. 164,467 contributes towards preventing the core from being broken up too soon.
We claim:
1. An armor-piercing projectile comprising a casing having a rear portion and a forward portion, the outer wall of the casing including at least one weakened area between the rear portion and the forward portion to Weaken the casing at the transverse plane of said area, a hard core fitted in said rear casing portion, said core having at its forward end a semi-spherical portion protruding past the transverse plane of said area and into said forward portion, and a hard core support in said forward portion disposed above the transverse plane of said area, said support having in its side facing the rear portion of the casing a conical cavity, said semi-spherical core portion protruding into said cavity, the inner wall of the support defining said conical cavity being a pivot bearing for the core portion protruding into the cavity to provide a fulcrum for the forward portion upon fracturing of the casing at said area.
2. A projectile according to claim 1 wherein said core is composed of two portions, one being said semi-spherical portion and the other being substantially cylindrical, the diameters of both portions being equal.
3. A projectile according to claim 1 wherein the forward portion of said casing is a conical nose cone, the apex angle of said cone being less than 35.
4. A projectile according to claim 1 wherein said core is made of tungsten carbide.
References Cited by the Examiner UNITED STATES PATENTS 1,089,161 3/14 Shore 102-52 1,301,822 4/19 Dalton 10252 2,724,334 11/55 Norton et al 102-52 FOREIGN PATENTS 224,512 4/62 Austria. 116,856 7/46 Sweden.
SAMUEL FEINBERG, Primary Examiner, BENJAMIN A. BORCHELT, Examiner.

Claims (1)

1. AN ARMOR-PIERCING PROJECTILE COMPRISING A CASING HAVING A REAR PORTION AND A FORWARD PORTION, THE OUTER WALL OF THE CASING INCLUDING AT LEAST ONE WEAKENED AREA BETWEEN THE REAR PORTION AND THE FORWARD PORTION TO WEAKEN THE CASING AT THE TRANSVERSE PLANE OF SAID AREA, A HARD CORE FITTED IN SAID REAR CASING PORTION, SAID CORE HAVING AT ITS FORWARD END A SEMI SPHERICAL PORTION PROTRUDING PAST THE TRANSVERSE PLANE OF SAID AREA AND INTO SAID FORWARD PORTION, AND A HARD CORE SUPPORT IN SAID FORWARD PORTION DISPOSED ABOVE THE TRANSVERSE PLANE OF SAID AREA, SAID SUPPORT HAVING IN ITS SIDE FACING THE REAR PORTION OF THE CASING A CONICAL CAVITY, SAID SEMI-SPHERICA
US321451A 1962-11-20 1963-11-05 Armor-piercing projectile with hard core Expired - Lifetime US3213792A (en)

Applications Claiming Priority (1)

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SE1246262 1962-11-20

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CH (1) CH441052A (en)
DE (1) DE1194292B (en)
GB (1) GB1002869A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4108072A (en) * 1964-12-29 1978-08-22 Deutsch-Franzosisches Forschungsinstitut Armor-piercing projectile having spaced cores
US4353305A (en) * 1978-11-23 1982-10-12 Etat Francais Represente Par Le Delegue General Pour L'armement Kinetic-energy projectile
US4643099A (en) * 1980-10-04 1987-02-17 Rheinmetall Gmbh Armored-piercing projectile (penetrator)
US4671181A (en) * 1972-07-12 1987-06-09 Rheinmetall Gmbh Anti-tank shell
US4671180A (en) * 1980-09-27 1987-06-09 Rheinmetall Gmbh Armor-piercing inertial projectile
US4708064A (en) * 1977-09-29 1987-11-24 Rheinmetall Gmbh Impact projectile
US4716834A (en) * 1980-03-27 1988-01-05 Rheinmetall Gmbh Inertial penetrator projectile
US4770102A (en) * 1980-09-23 1988-09-13 Rheinmetal Gmbh Piercing projectile with a weakened head
US4895077A (en) * 1988-05-24 1990-01-23 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Projectile core for a sabot projectile
US4920888A (en) * 1982-03-17 1990-05-01 Rheinmetall Gmbh Subcaliber, finstabilized penetrator projectile
US5299501A (en) * 1990-09-28 1994-04-05 Bei Electronics, Inc. Frangible armor piercing incendiary projectile
WO2003102491A1 (en) * 2002-05-30 2003-12-11 Vlastimil Libra Piercing bullet and method for manufacturing thereof

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH627550A5 (en) * 1978-05-30 1982-01-15 Oerlikon Buehrle Ag SPIRAL-STABILIZED DRIVING MIRROR BULLET TO OVERCOME A HETEROGENEOUS RESISTANCE.
DE2948375A1 (en) * 1979-12-01 1984-02-23 Rheinmetall GmbH, 4000 Düsseldorf PENETRATOR FOR A LOW-CALIBRATION BULLET STOCK TO COMBAT - ESPECIALLY MULTIPLE - ARMORED TARGETS
DE3126399A1 (en) * 1981-07-04 1983-01-13 Rheinmetall GmbH, 4000 Düsseldorf ARMORING BULLET
DE3209593A1 (en) * 1982-03-17 1983-09-29 Rheinmetall GmbH, 4000 Düsseldorf LOW-CALIBRAL ARMORED BULLET RIFLE (PENETRATOR)
DE4230070A1 (en) * 1992-09-09 1994-03-10 Rheinmetall Gmbh Drive cage projectile with low calibre core - has insert fixed centrally on projectile point in hood with blunt conical indentation accommodating projectile point

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1089161A (en) * 1913-12-10 1914-03-03 Albert F Shore Projectile.
US1301822A (en) * 1917-12-22 1919-04-29 Washington Steel & Ordnance Company Armor-piercing projectile.
US2724334A (en) * 1949-12-12 1955-11-22 William C Norton High velocity armor piercing shot
AT224512B (en) * 1961-02-01 1962-11-26 Oerlikon Buehrle Ag Impact fuse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US580570A (en) * 1897-04-13 Armor-piercing projectile
FR405281A (en) * 1908-11-10 1909-12-24 Uves-Maisons Bursting shell
FR454822A (en) * 1912-09-26 1913-07-16 Robert Abbott Hadfield Breast Piercing Projectile Hats Improvements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1089161A (en) * 1913-12-10 1914-03-03 Albert F Shore Projectile.
US1301822A (en) * 1917-12-22 1919-04-29 Washington Steel & Ordnance Company Armor-piercing projectile.
US2724334A (en) * 1949-12-12 1955-11-22 William C Norton High velocity armor piercing shot
AT224512B (en) * 1961-02-01 1962-11-26 Oerlikon Buehrle Ag Impact fuse

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4108072A (en) * 1964-12-29 1978-08-22 Deutsch-Franzosisches Forschungsinstitut Armor-piercing projectile having spaced cores
US4671181A (en) * 1972-07-12 1987-06-09 Rheinmetall Gmbh Anti-tank shell
US4708064A (en) * 1977-09-29 1987-11-24 Rheinmetall Gmbh Impact projectile
US4353305A (en) * 1978-11-23 1982-10-12 Etat Francais Represente Par Le Delegue General Pour L'armement Kinetic-energy projectile
US4716834A (en) * 1980-03-27 1988-01-05 Rheinmetall Gmbh Inertial penetrator projectile
US4770102A (en) * 1980-09-23 1988-09-13 Rheinmetal Gmbh Piercing projectile with a weakened head
US4671180A (en) * 1980-09-27 1987-06-09 Rheinmetall Gmbh Armor-piercing inertial projectile
US4774889A (en) * 1980-09-27 1988-10-04 Rheinmetall Gmbh Armor-piercing projectile
US4643099A (en) * 1980-10-04 1987-02-17 Rheinmetall Gmbh Armored-piercing projectile (penetrator)
US4920888A (en) * 1982-03-17 1990-05-01 Rheinmetall Gmbh Subcaliber, finstabilized penetrator projectile
US4895077A (en) * 1988-05-24 1990-01-23 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Projectile core for a sabot projectile
US5299501A (en) * 1990-09-28 1994-04-05 Bei Electronics, Inc. Frangible armor piercing incendiary projectile
WO2003102491A1 (en) * 2002-05-30 2003-12-11 Vlastimil Libra Piercing bullet and method for manufacturing thereof

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CH441052A (en) 1967-07-31
DE1194292B (en) 1965-06-03
GB1002869A (en) 1965-09-02

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