US3913488A - Ballistic disc - Google Patents

Ballistic disc Download PDF

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Publication number
US3913488A
US3913488A US397527A US39752773A US3913488A US 3913488 A US3913488 A US 3913488A US 397527 A US397527 A US 397527A US 39752773 A US39752773 A US 39752773A US 3913488 A US3913488 A US 3913488A
Authority
US
United States
Prior art keywords
disc
ballistic
casing
discs
central portion
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
US397527A
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English (en)
Inventor
Bryant R Dunetz
Seymour Kronman
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.)
United States Department of the Army
Original Assignee
United States Department of the Army
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 United States Department of the Army filed Critical United States Department of the Army
Priority to US397527A priority Critical patent/US3913488A/en
Publication of USB397527I5 publication Critical patent/USB397527I5/en
Application granted granted Critical
Publication of US3913488A publication Critical patent/US3913488A/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
    • 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
    • F42B12/10—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 shaped or hollow charge
    • F42B12/14—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 shaped or hollow charge the symmetry axis of the hollow charge forming an angle with the longitudinal axis of the projectile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/028—Shaped or hollow charges characterised by the form of the liner
    • 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
    • F42B12/20—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
    • F42B12/22—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction
    • F42B12/32—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction the hull or case comprising a plurality of discrete bodies, e.g. steel balls, embedded therein or disposed around the explosive charge

Definitions

  • This invention relates generally to a spherically curved metallic ballistic disc capable of being fired at high velocities and altering its shape, upon being fired, to a convex configuration capable of inflicting great anti-personnel and anti-materiel damage and of piercing armor plate of substantial thickness.
  • the disc does not disintegrate prior to impact.
  • This invention also relates to apertured casings for simultaneously launching a plurality of such ballistic discs.
  • a launcher for a single ballistic disc in accordance with the present invention is described in the above-referenced Kronman et al. US. Pat. No. 3,695,141.
  • An ordnance device for simultaneously launching a multiplicity of our ballistic discs will be described hereafter.
  • the ballistic disc of our invention is made of metallic material, preferably steel, e.g., mild steel, such as SAE 1020. It is spherically curved and is thicker at its central portion than at its peripheral portion, is mounted with its concave side facing the target and, upon firing, inverts to a streamlined elliptical ogive configuration during flight toward the target.
  • the casing which may be of frustoconial, cylindrical or other suitable shape, may be of plastic (e.g., polymethylmethacrylate) or other suitable material.
  • the curved side of the casing has a plurality of round apertures, preferably arranged in a circle or in several parallel circles. Each aperture has yieldingly mounted therein a ballistic disc along its thin periphery, either snapped in or adhesively connected.
  • the ballistic discs are launched by a suitable high explosive propellant disposed inside the casing, e.g., percent HMX (cyclotetramethylene tetranitramine) and 30 percent TNT, with or without a booster such as tetryl (tetranitromethyl aniline). Disc velocities of 7,00010,000 feet per second were attained.
  • a suitable high explosive propellant e.g., percent HMX (cyclotetramethylene tetranitramine) and 30 percent TNT, with or without a booster such as tetryl (tetranitromethyl aniline).
  • FIG. 1 is an enlarged (not to scale) cross-sectional view of the ballistic disc portion of the present invention
  • FIG. 2 is a schematic side elevation (not to scale) of the projectile (deformed ballistic disc) after firing;
  • FIG. 3 is a side elevation of a weapon or ordnance device including a number of ballistic discs
  • FIG. 4 is a schematic vertical section through the embodiment of FIG. 3.
  • FIG. 1 there is shown our ballistic disc 10 made of metal, preferably a hard metal such as steel (e.g., mild steel SAE 1020), wherein the central portion is of greater thickness than the thickness around the disc periphery.
  • a hard metal such as steel (e.g., mild steel SAE 1020)
  • SAE 1020 mild steel
  • disc 10 has an outer spherical face 12, an inner spherically curved central portion 14 of constant thickness extending approximately one-half of the total disc diameter, between points 16 and 18, and a peripheral portion 20 extending radially outwardly from the central portion and being of lesser thickness than the cen tral portion.
  • the discs peripheral portion 20 has an inner surface which conforms to a frusto-conical configuration so that the thickness of the peripheral portion 20 diminishes at a constant rate from the thickness of the central portion toward a predetermined lesser thickness at the peripheral edge 22 of the disc.
  • An angle 0 is formed at the peripheral edge 22 between the inner boundary line 24 of the peripheral portion 20 and the chord 26 which connects two diametrically opposite points located on edge 22.
  • the device may be effectively fired at close range or long range.
  • the disc does not disintegrate prior to impact, and retains more than 95 percent of its original mass.
  • An ordnance device capable of simultaneously launching a multiplicity of our ballistic discs for 360 area coverage as shown in FIGS. 3 and 4. It can be used as the warhead of a missile, a submissile, a bomblet, artillery shell, or infantry grenade, or can be used as a stationary weapon in the nature of a land mine.
  • its curved side wall 32 has a plurality of circular apertures 34, arranged in a circle 36 or, preferably, in several parallel circles, 36, 38, 40.
  • the outer dimensions of the frustocone, as illustrated, are 3 9/16 inches (approximately 90mm.) diameter at bottom, 2.29 inches diameter at top, slant height of curved surface of revolution 4 1/16 inches; thickness of side wall 32 is 3/16 inch and of top wall 42 is inch; diameter of each aperture is approximately 1 inch.
  • FIG. 4 There is seated in each aperture a ballistic disc 10, as shown perspectively in FIG. 3, and diagrammatically in dashed lines in FIG. 4, with its concave face facing outwardly.
  • FIG. 4 does not reflect the staggered arrangement of apertures 34 as shown in FIG. 3; either arrangement may obviously be used.
  • a suitable adhesive such as Eastman 910, a thickened and plasticized cyanoacrylate, may be used to adhere disc 10 to the periphery of aperture 34; however, the adhesive can be dispensed with if disc and aperture are machined with sufficient precision to snap the one into the other.
  • a plastic material such as polymethyl methacrylate (Plexiglass; Lucite) may be used for the casing 30, but other suitable plastics or nonplastics materials may obviously be substituted.
  • an explosive train 44 comprising three cylindrical tetryl pellets 46, 48, 50 (being, respectively, inch, 1 inch, and #2 inch height and diameter) at the respective height levels of aperture circles 36, 38, 40; the pellets are connected to each other by a Primacord 52; the explosive train is spaced from the top plate 42 by suitable spacer means 54 (shown in dashed lines).
  • a suitable detonator (not shown) is provided ator near the open base of casing 30.
  • Additional explosive propellant such as a mixture (e.g., 50:50) of RDX (cyclotrimethylene trinitramine) and pentolite [which in turn is a mixture of 50-90 percent TNT and 10-50 percent PETN (pentaerythritol trinitrate) ⁇ , or a mixture of I-IMX and RDX, e.g., :30, may be packed inside casing 30.
  • RDX cyclotrimethylene trinitramine
  • pentolite which in turn is a mixture of 50-90 percent TNT and 10-50 percent PETN (pentaerythritol trinitrate) ⁇
  • I-IMX and RDX e.g., :30
  • the casing and propellant system of above-referenced Kronman et al. U.S. Pat. No. 3,695,141 may be used for launching our ballistic disc 10, with or without a supporting platform.
  • the following table illustrated the effectiveness of our ballistic disc against armor plate, 1% inch ballistic discs (weight 170 grains each), produced in accordance with Example 1, above, were fired against ,41 inch steel plate at various distances, and the effectiveness was measured in terms of the sizes of the holes produced in the armor plate.
  • a substantially spherically curved metallic highvelocity ballistic disc of substantially circular periphery said disc being non-disintegrating prior to impact and having a concave and a convex side, the curved central portion of said disc being of greater thickness than the peripheral portion of said disc, said disc prior to firing being yieldingly retainable about its periphery within a circular aperture of a casing with the concave side of said disc facing outwardly, and said disc upon the diameter of said disc.
  • apertures are arranged in at least one circle in the side of said frustocone.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
US397527A 1973-09-17 1973-09-17 Ballistic disc Expired - Lifetime US3913488A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US397527A US3913488A (en) 1973-09-17 1973-09-17 Ballistic disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US397527A US3913488A (en) 1973-09-17 1973-09-17 Ballistic disc

Publications (2)

Publication Number Publication Date
USB397527I5 USB397527I5 (OSRAM) 1975-01-28
US3913488A true US3913488A (en) 1975-10-21

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610204A (en) * 1984-06-25 1986-09-09 Dunne Brian B Method and apparatus for generating a high-speed metallic jet
US4622901A (en) * 1983-11-30 1986-11-18 Rheinmetall Gmbh. Warhead
EP0244507A1 (de) * 1986-03-12 1987-11-11 Rheinmetall GmbH Sprengladung mit einer projektilbildenden Einlage
US4711181A (en) * 1985-12-18 1987-12-08 Diehl Gmbh & Co. Warhead with rotationally-symmetrical hollow charge
EP0180734A3 (en) * 1984-09-08 1989-02-01 Diehl Gmbh & Co. Ammunition, particularly mortar ammunition
US4919050A (en) * 1988-12-14 1990-04-24 Dobrinski John W Well perforating device
US4974515A (en) * 1988-07-14 1990-12-04 Diehl Gmbh & Co. Warhead
US5045851A (en) * 1988-12-21 1991-09-03 General Signal Corporation Analog signal multiplexer with noise rejection
US5153373A (en) * 1989-12-14 1992-10-06 Rheinmetall Gmbh Warhead
US5320044A (en) * 1985-06-17 1994-06-14 The United States Of America As Represented By The Secretary Of The Army Three radii shaped charge liner
US5559304A (en) * 1985-08-16 1996-09-24 Rheinmetall Gmbh Insert for a warhead
US5744747A (en) * 1995-10-20 1998-04-28 Giat Industries Slug generating charge
US20050045057A1 (en) * 2000-05-25 2005-03-03 Daniel Casenave Explosive round with controlled fragments
US8869916B2 (en) 2010-09-09 2014-10-28 National Oilwell Varco, L.P. Rotary steerable push-the-bit drilling apparatus with self-cleaning fluid filter
US9016400B2 (en) 2010-09-09 2015-04-28 National Oilwell Varco, L.P. Downhole rotary drilling apparatus with formation-interfacing members and control system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2736424B1 (fr) * 1995-07-07 1997-08-08 Giat Ind Sa Tete militaire a charge formee

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1244298A (en) * 1917-05-23 1917-10-23 Thomas J Farero Bullet.
US1301098A (en) * 1918-11-12 1919-04-22 Archer A Bull Bomb.
US2379257A (en) * 1943-04-29 1945-06-26 Scott James Lloyd Aerial bomb
US3386380A (en) * 1967-01-04 1968-06-04 Francis Gus Method and apparatus for propelling projectiles for space and other applications
US3489088A (en) * 1967-07-26 1970-01-13 Oerlikon Buehrle Ag Explosive projectile containing at least one secondary projectile
US3517615A (en) * 1961-07-14 1970-06-30 Us Navy Explosive wave shaper
US3683809A (en) * 1970-06-30 1972-08-15 Hercules Inc Detonator fuse initiated aqueous slurry explosive system
US3695141A (en) * 1970-11-06 1972-10-03 Us Navy Explosive ordnance demolition weapon

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1244298A (en) * 1917-05-23 1917-10-23 Thomas J Farero Bullet.
US1301098A (en) * 1918-11-12 1919-04-22 Archer A Bull Bomb.
US2379257A (en) * 1943-04-29 1945-06-26 Scott James Lloyd Aerial bomb
US3517615A (en) * 1961-07-14 1970-06-30 Us Navy Explosive wave shaper
US3386380A (en) * 1967-01-04 1968-06-04 Francis Gus Method and apparatus for propelling projectiles for space and other applications
US3489088A (en) * 1967-07-26 1970-01-13 Oerlikon Buehrle Ag Explosive projectile containing at least one secondary projectile
US3683809A (en) * 1970-06-30 1972-08-15 Hercules Inc Detonator fuse initiated aqueous slurry explosive system
US3695141A (en) * 1970-11-06 1972-10-03 Us Navy Explosive ordnance demolition weapon

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622901A (en) * 1983-11-30 1986-11-18 Rheinmetall Gmbh. Warhead
US4610204A (en) * 1984-06-25 1986-09-09 Dunne Brian B Method and apparatus for generating a high-speed metallic jet
EP0180734A3 (en) * 1984-09-08 1989-02-01 Diehl Gmbh & Co. Ammunition, particularly mortar ammunition
US5320044A (en) * 1985-06-17 1994-06-14 The United States Of America As Represented By The Secretary Of The Army Three radii shaped charge liner
US5559304A (en) * 1985-08-16 1996-09-24 Rheinmetall Gmbh Insert for a warhead
US4711181A (en) * 1985-12-18 1987-12-08 Diehl Gmbh & Co. Warhead with rotationally-symmetrical hollow charge
EP0244507A1 (de) * 1986-03-12 1987-11-11 Rheinmetall GmbH Sprengladung mit einer projektilbildenden Einlage
US4776278A (en) * 1986-03-12 1988-10-11 Rheinmetall Gmbh Explosive charge having a projectile forming insert
US4974515A (en) * 1988-07-14 1990-12-04 Diehl Gmbh & Co. Warhead
US4919050A (en) * 1988-12-14 1990-04-24 Dobrinski John W Well perforating device
US5045851A (en) * 1988-12-21 1991-09-03 General Signal Corporation Analog signal multiplexer with noise rejection
US5153373A (en) * 1989-12-14 1992-10-06 Rheinmetall Gmbh Warhead
US5744747A (en) * 1995-10-20 1998-04-28 Giat Industries Slug generating charge
US20050045057A1 (en) * 2000-05-25 2005-03-03 Daniel Casenave Explosive round with controlled fragments
US7036432B2 (en) * 2000-05-25 2006-05-02 Etienne Lacroix Tous Artifices S.A. Explosive round with controlled explosive-formed fragments
US8869916B2 (en) 2010-09-09 2014-10-28 National Oilwell Varco, L.P. Rotary steerable push-the-bit drilling apparatus with self-cleaning fluid filter
US9016400B2 (en) 2010-09-09 2015-04-28 National Oilwell Varco, L.P. Downhole rotary drilling apparatus with formation-interfacing members and control system
US9476263B2 (en) 2010-09-09 2016-10-25 National Oilwell Varco, L.P. Rotary steerable push-the-bit drilling apparatus with self-cleaning fluid filter

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Publication number Publication date
USB397527I5 (OSRAM) 1975-01-28

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