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Publication numberUS3750582 A
Publication typeGrant
Publication dateAug 7, 1973
Filing dateSep 3, 1971
Priority dateSep 3, 1971
Publication numberUS 3750582 A, US 3750582A, US-A-3750582, US3750582 A, US3750582A
InventorsKintish I, Marcus I
Original AssigneeUs Army
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Projectile with differential tandem shaped charges
US 3750582 A
A projectile utilizing tandem shaped charges is produced, said projectile having superior armor penetration power than previous shape charge projectiles.
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Description  (OCR text may contain errors)

United States Patent 1 [111 3,750,582

Kintish et a1. Aug. 7, 1973 [54] PROJECTILE WITH DIFFERENTIAL 3,416,449 12/1968 Brothers 102/24 HC TANDEM SHAPED CIHIARGIE Inventors: Irving 1L. Kintislh; Irwin Mlarcns,

both of Rockaway, NJ.

The United States of America as represented by the Secretary of the Army, Washington, DC.

Filed: Sept. 3, 1971 Appl. No.: 177,736


US. Cl. 102/56, 102/24 HC Int. Cl. 1 421) 13/10 Field of Search 102/24 HC, 56

References Cited UNITED STATES PATENTS 11/1965 Robinson, Jr. et a1 102/24 HC FOREIGN PATENTS OR APPLICATIONS 341,743 10/1959 Switzerland i. 102/24 HC Primary Examiner-Verlin R. Pendegrass Attorney-I-Iarry M. Saragovitz, Edward J. Kelly etal.

A projectile utilizing tandem shaped charges is produced, said projectile having superior armor penetration power than previous shape charge projectiles.

ABSTRACT The invention described herein may be manufactured, used and licensed by or for the Government for govermental purposes without the payment to us of any royalties thereon.

4 Claims, 2 Drawing Figures PAH-INTEL] AUG 'IISH 3 75Q,582


INVENTORS IRVING L. KINTISH BY IRWIN MARCUS Z/u/V? 711.- I away-W1 Mal/M wfywm m PROJECTIILE WlITlil DIFFERENTIIAL TANDEM SHAPED ClliiAlltGllEfi DESCRIPTION OF THE INVENTlON In the projectile explosive art it has been found that the armor piercing ability of a given quantity of explosive charge may be optimized by forming the forward portion of the charge with an appropriate configura' tion. Such charges are generally referred to as shaped charges, and their armor piercing effectiveness results from providing that shape in the front of the charge which affords the greatest directivity and concentration ofexplosive force in a localized area. A particularly effective configuration for such shaped charges is that obtained by forming a conical cavity or recess in the forward end of the charge and lining the cavity with some material e.g. copper.

When the end of the explosive charge opposite the liner is initiated, the detonation wave passes over the metal liner causing the liner to collapse upon itself. When the collapsing liner material reaches the axis of the system, it divides into two parts. A small part forms an extremely high-velocity jet and the other part forms a slower but more massive slug.

The high velocity jet is responsible for the relatively deep penetration achieved by the shaped charge. The tip of the jet attains a velocity of about 25,000 feet/sec. and the rear portions of the jet attain velocities of nearly 5,000 feet/sec. This velocity difference within the jet is a result of the physical characteristics of most shaped charges. At the apex of the cone, the ratio of the explosive charge to the liner mass is relatively large. However, as the detonation progresses down the liner, the mass of the liner increases while the amount of ex-- plosive available to move it decreases. The ratio goes to zero at the base of the liner because there is no explosive at the base. Therefore, the various portions of the liner reach the axis at progressively lower velocities and generate a jet having a velocity gradient along its length.

Because the jet impacts a target at such high velocities, an exceedingly high pressure is generated. Typically, this pressure is about 4 X psi. The high pressure causes both the jet and the target to deform hydrodynamically. The jet moves the target material radially and flows with it. Penetration continues in this manner until the jet is used up or until the jet decreases to some critical value. Until our invention, penetration of armor by a high velocity jet was limited by the above mentioned forces to approximately 10-12 inches.

An important object of this invention is to increase the efficiency of shape charge projectiles by introducing a follow-through charge in the jet hole formed by the initial charge.

A further object of this invention is to increase the area of damage in a target by introducing a secondary explosive force through a jet hole made by the initial shape charge in the projectile.

Many other objects and many of the attendant advantages of this invention will be readily appreciated as the same become better understood by reference to the following detailed description.

The present invention involves the use of two shape charges in one projectile. The first shape charge upon initiation will form the aforementioned jet which proceeds through a small central hole in a perforated disc, said disc separating the two charges. The slower and later formed slug of the initial change will be impeded by the separating disc causing formation of a shock wave sufficient to detonate the second shape charge. The second shape charge is chosen from explosives having explosive velocities greater than those of the first shape charge such that the jet created by the second charge will precede the slower slug of the first charge and enhance the penetration caused by the jet of the first charge.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. l is a sectional view of such a tandem shape charge system.

FIG. 2 presents a frontal view of the perforated disc used to separate the charges.

DETAILED DESCRIPTION OF THE INVENTION Referring now more particularly to the drawings, a projectile container 1 is shown in FIG. 1 and therein an initial shape charge 6 having a conical liner 7'. The projectile container may be made ofa low carbon steel or other fragmentation metals. The shape charge 6 is preferably conical in shape although it may also be fluted. The metallic linerfor the above shape charge may be any material designed to increase the depth of shape charge penetration e.g. copper, aluminum, antimony or alloys of the above and the liner configuration is chosen to conform to the particular shape charge used. A conical shape charge and liner with an angle of 42 is preferable.

The explosive for the shape charge may be any noninitiating high explosive known to the art such as ali' phatic, aromatic and heterocyclic nitrates, nitrocompounds and nitramines, binary explosives (mixtures of 2&6 trinitrotoluene and a second explosive such as cyclotrimethylene trinitramine), and plastisol explosives such as PBX percent cyclotrimethylene trinitramine, 8.5 percent polystyrene and 1.5 percent dioctylphthelate).

The disc 4 may be made of reinforced fiberglass or various metals such as steel, copper and alloys thereof. The disc is approximately 1/8 1/4 inches thick and is perforated as shown in FIG. 2. The free space 8 or aperture in the center of the disc is so calculated in size as to allow the jet, formed by the initial shape charge detonation, to pass through unhampered while retarding any slug formed by the initial shape charge and liner particles.

The initial shape charger 6 is positioned in the projectile such that the distance between 4 and 5 shown in FIG. 11 is about 1-1 1/2 cone diameters. This distance provides a sufficient stand-off between the initial shape charge and the projectile nose such that optimum effectiveness can be attained from the initial shape charge detonation.

Initiation of shape charge 6 is accomplished by initial detonating agents such as lead azide, mercury fulmimate and diazodinitrophenol. These detonating agents are in turn initiated by piezoelectric or base fuzing techniques known to the art.

The secondary shape charge 3 and shape charge liner 7 may be conical, fluted or hemispherical (as shown in FIG. 1) in configuration. As in the initial shape charge system the liner material may be copper, aluminum, antimony, or alloys thereof. The shape charge explosive as in the initial shape charge may be an aliphatic, aromatic or heterocyclic nitrate, nitro compound, or nitra- 3 mine, a binary explosive, or a plastic explosive provided that the explosive chosen must have a greater detonation rate than the explosive chosen for the initial charge and secondly that the explosive is susceptible to shock wave detonation.

The standoff distance between the secondary shape charge and the projectile nose is about 34 cone diameters. This distance will allow sufficient time for initiation and jet formation of the secondary charge. Initiation of the secondary charge is accomplished by the shock wave formed when the slug from the initial shape charge impacts with the disc which divides the two charges. The perforations in the disc as shown in FIG. 2 allow for extrusion of the slug such that a near planar shock wave is produced which will not cause excessive breakup of the secondary charge while initiating it.

The second charge when detonated will form a jet that will penetrate and enhance the perforation of the target already accomplished by the jet of the initial charge.

Thusly through the practice of our invention a projectile is produced which has greater perforation power and which is more efficient than previous shape charge projectiles.

We wish it to be understood that we do not desire to be limited to the exact detail of construction shown and described for obvious modification will occur to a person skilled in the art.

We claim:

1. A projectile comprising:

a hollow shell having longitudinally disposed therein a pair of spaced apart shaped charges each provided with an abutting forward liner and having a rearwardly convergent configuration, wherein the forward shaped charge possesses a greater explosion velocity than the rear shaped charge and is susceptible to shock wave detonation from the rear shaped charge,

means for initiating the rear shaped charge explosive,

a disc adjacent the rear end of the forward charge having a central aperture which is smaller than the slug from the rear charge, said forward charge and liner being provided with coaxial openings therethrough which are aligned with said aperture,

whereby when the rear charge is detonated and a jet and slug are formed therefrom, the central aperture and openings allow passage of the jet while the disc retards passage of the slug and thereby imparts a shock wave which detonates the forward shape charge.

2. The projectile of claim 1 wherein the distance between the disc and the liner of the rear charge is between 1 and 1.5 shape charge diameters, I

3. The projectile of claim 1 wherein the 'disc is a material selected from the group consisting of steel, copper, alloys of steel, alloys of copper and reinforced fiberglass.

4. The projectile of claim 1, wherein the disc is provided with a plurality of openings therethrough in addition to said central aperture.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3215074 *Jun 13, 1963Nov 2, 1965Exxon Production Research CoApparatus for well drilling operations with explosives
US3416449 *Dec 7, 1966Dec 17, 1968Army UsaTandem effect anti-tank projectile
CH341743A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4102271 *Feb 10, 1977Jul 25, 1978Rheinmetall Gmbh.Armor-piercing tandem shell or projectile
US4327642 *Jan 28, 1980May 4, 1982Diehl Gmbh & Co.Inserts for cutting charges
US4466353 *Mar 24, 1983Aug 21, 1984The United States Of America As Represented By The Secretary Of The ArmyHigh velocity jet shaped charge
US4494459 *Sep 5, 1980Jan 22, 1985General Electric CompanyExplosive projectile
US4497253 *Feb 4, 1981Feb 5, 1985Rheinmetall GmbhArmor-piercing projectile
US4714022 *Sep 4, 1985Dec 22, 1987Etat FrancaisWarhead with tandem shaped charges
US4833994 *Jan 14, 1988May 30, 1989Honeywell, Inc.Dual purpose explosive lead for a projectile having a shaped charge warhead
US4848238 *Jun 18, 1987Jul 18, 1989Rheinmetall GmbhActive element for combating, in particular, active armored targets
US4989517 *Mar 29, 1982Feb 5, 1991The United States Of America As Represented By The Secretary Of The ArmyTandem bomblet
US5223666 *Jun 4, 1992Jun 29, 1993The United States Of America As Represented By The Secretary Of The NavyApparatus for clearing mines
US5394804 *Jul 21, 1993Mar 7, 1995Thomson-Brandt ArmementsExplosive device with a hollow charge, designed for penetrating armor protected by active primary armor
US5522319 *Jul 5, 1994Jun 4, 1996The United States Of America As Represented By The United States Department Of EnergyFree form hemispherical shaped charge
US6186070 *Nov 27, 1998Feb 13, 2001The United States Of America As Represented By The Secretary Of The ArmyCombined effects warheads
US6910421 *Dec 1, 1993Jun 28, 2005Bae Systems PlcGeneral purpose bombs
US7493861Jul 24, 1989Feb 24, 2009The United States Of America As Represented By The Secretary Of The ArmyTandem shaped charge warhead having a confined forward charge and a light-weight blast shield
US7739955 *Jun 3, 2004Jun 22, 2010Bae Systems Bofors AbDevice adjacent to an explosive charge with at least two liners
US7779760 *Feb 23, 2006Aug 24, 2010Armaments Corporation Of South Africa LimitedShaped charge assembly and method of damaging a target
US7987789Mar 8, 2007Aug 2, 2011Saab AbMethod for reducing the amount of ammunition types to be used and an ammunition device
DE3835147A1 *Oct 15, 1988Apr 26, 1990Diehl Gmbh & CoProjectile-forming ammunition
DE3923075A1 *Jul 13, 1989Jan 17, 1991Diehl Gmbh & CoPlug following molten metal jet from hollow charge - is sepd. by explosive plate ignited by arriving jet
EP0193427A1 *Jan 28, 1986Sep 3, 1986ETAT-FRANCAIS représenté par le DELEGUE GENERAL POUR L'ARMEMENT (DPAG)Warhead with shaped charges arranged in tandem
EP1087203A1 *Sep 27, 1999Mar 28, 2001Bofors Carl Gustaf ABMethod for a multiple hollow charge and a multiple hollow charge for implementing the method
EP1832838A1 *Mar 9, 2006Sep 12, 2007Saab ABA method for reducing the amount of ammunition types to be used and an ammunition device
U.S. Classification102/476
International ClassificationF42B12/02, F42B12/18
Cooperative ClassificationF42B12/18
European ClassificationF42B12/18