Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2972948 A
Publication typeGrant
Publication dateFeb 28, 1961
Filing dateSep 16, 1952
Priority dateSep 16, 1952
Publication numberUS 2972948 A, US 2972948A, US-A-2972948, US2972948 A, US2972948A
InventorsKray Raymond H
Original AssigneeKray Raymond H
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Shaped charge projectile
US 2972948 A
Previous page
Next page
Description  (OCR text may contain errors)

Feb. 28, 1961 KRAY 2,972,948


Filed Sept. 16, 1952, Ser. No. 309,957

1 Claim. (Cl. 102-56) (Granted under Title 35, US. Code (1952), see. 266) The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

The present invention relates generally to explosive charges particularly as employed in projectiles, and more specifically to shaped charges.

In the projectile explosive charge 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 wit-h an appropriate configuration. 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 of explosive force in a localized area. A particularly effective configuration for such shaped charges is that obtained by forming a conical hollow or recess in the forward end of the charge. In accordance with the present invention, it is contemplated to improve the pentrating effectiveness of shaped charges by complementing the shaped charge with a pocket of chemical reactants, which when ignited by the explosion or heat of explosion of the charge produce a vigorous,-very high temperature, exothermic reaction and provide a substantial quantity of molten metallic mass in the core of the gaseous products of charge detonation, thus adding to the heat and ehergy of the detonation and at the same time enhancing the penetrating properties of the explosive.

It is therefore one object of the present invention to complement a shaped charge with chemically interreactive materials, which when set off by charge detonation increases the energy content of the explosion.

Another object of the present invention is to complement a shaped charge with exothermically interreactive materials, which when set off by charge detonation enhances the core of the gaseous products of detonation with a molten mass of metal.

Another object of the present invention is to complement a shaped charge with exothermically interreactive materials, such as thermite or a mixture of iron oxide, potassium perchlorate, and metallic titanium, which, when set off by charge detonation, increases the energy content of the explosion and enhances the core of the gaseous products of shaped charge detonation with a molten mass of metal.

Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawing, which is a longitudinal sectional view of the forward portion of a projectile showing the shaped charge, the pocket of reactants complementary thereto, and a ballistic nose or cap for the projectile.

The projectile 10, whose forward portion is shown in the drawing, comprises as conventional components the substantially cylindrical main casing 11, capped by the ballistic nose 13, and containing the shaped explosive charge 12. Other conventional projectile components (not shown) may of course be included in or on the projectile as deemed appropriate or desirable, as for example a detonator and/or a primer, an arming fuse, a turning band, and the like. shaped charge chosen for the purpose of illustrating the present invention is the type wherein a conical recess is formed in the forward portion of the charge, which is referred to above as an effective armor piercing configuration.

In addition to the foregoing conventional components of a shaped charge projectile, there is provided in accordance with the present invention a capsule or pocket 14 containing a composition 17 of exothermically interreactive materials producing, when ignited or set off by the detonation or heat of detonation of the charge 12, a high temperature and a mass of molten metal. Composition 17 may be, for example, thermite (iron oxide and aluminum), or a mixture containing iron oxide, potassium perchlorate, and metallic titanium. In order to fix the location of the composition 17 and to facilitate its positioning in the forward portion of the charge 12, a container, pocket, or capsule is formed therefor, as for example by the nested cones 15 and 16, which preferably is formed of aluminum. It will be noted that in the preferred and illustrated embodiment the use of nested cones to form the pocket 14 provides a configuration which substantially coincides with the desired conical configuration of the forward end of the shaped charge.

In use of the present invention hereinabove described in detail with reference to one specific embodiment, upon detonation of the shaped charge 12, the heat generated ignites the composition 1'7 of thermite or the like, which through its own reaction generates substantial quantities of heat and provides very high temperatures. As a result of this reaction, the energy content of the explosion is elevated and there is produced a substantial quantity of high temperature molten metal mass resulting from disintegration of the metallic cones 15 and 16 plus the products of combustion of composition 17. This combined molten metallic mass is focused by the configuration of the shaped charge onto the core of the gaseous products of the shaped charge detonation such that the penetrating power of the core is exhanced.

Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claim the invention may be practiced otherwise than as specifically described.

What is claimed is:

in an explosive projectile, the combination of a casing having a nose detachably secured thereto, a portion of said casing. and nose forming a circumferential groove, a shaped charge having a cone shaped recess in the forwardend thereof with the wall defining said recess converging in a rearwardly direction, said charge being disposed and confined within said casing and capable of producing a jet having a potent and concentrated striking force when fired, a sealed cone shaped capsule disposed within said recess and having inner and outer mutually spaced walls diverging in a rearwardly direction, a flange on each of said walls at the base of said cone shaped capsule in snug engagement with respect to each other and disposed within said groove and in snug Patented Feb. 28, 1 961,,

As will be noted, the

engagement with said casing and nose for locking said capsule to said casing and maintaining the capsule within said recess, a chemically inter-reactive metallic material sealed Within said capsule contiguous With said shaped charge and activated thereby and concurrently therewith for producing a mass of molten metal, the heavier molecules of which intermingle With said jet sufiiciently to form an integral part thereof at the leading end of the jet thereby to increase the striking force of the jet.

References Cited in the file of this patent UNITED STATES PATENTS Cook July 22, 1952 Jasse Feb. 17, 1953 Weiss Feb. 16, 1954 FOREIGN PATENTS Great Britain Nov. 6, 1945 'Jreat Britain Oct. 10, 1951

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2604042 *Jul 30, 1948Jul 22, 1952Ici LtdDetonating explosive charge and method of impressing surfaces employing same
US2628559 *Feb 12, 1946Feb 17, 1953Ct D Etudes M B A SocExplosive drill
US2669182 *May 26, 1949Feb 16, 1954Brevets Aero MecaniquesShattering and incendiary shell
GB573078A * Title not available
GB658625A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3135205 *Mar 3, 1959Jun 2, 1964Hycon Mfg CompanyCoruscative ballistic device
US3165057 *Jul 2, 1962Jan 12, 1965Ling Temco Vought IncLinear shaped charge unit
US3235005 *Dec 29, 1961Feb 15, 1966Schlumberger ProspectionShaped explosive charge devices
US3675575 *May 23, 1969Jul 11, 1972Us NavyCoruscative shaped charge having improved jet characteristics
US3730093 *Dec 27, 1966May 1, 1973North American RockwellExplosive apparatus
US4111126 *Jun 20, 1973Sep 5, 1978Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter HaftungWarhead for use against armored targets
US4259906 *Jan 12, 1979Apr 7, 1981The United States Of America As Represented By The Secretary Of The ArmyShape charge agent disposing process
US4487130 *Jan 10, 1983Dec 11, 1984Ab BoforsHollow charge
US5852256 *Mar 16, 1979Dec 22, 1998The United States Of America As Represented By The Secretary Of The Air ForceNon-focusing active warhead
US6644203Jun 30, 2000Nov 11, 2003Kevin Mark PowellExplosive device and method of using such a device
US6786157Sep 29, 2000Sep 7, 2004Kevin Mark PowellHollow charge explosive device particularly for avalanche control
US7658148 *Oct 5, 2007Feb 9, 2010Surface Treatment Technologies, Inc.Reactive shaped charges comprising thermal sprayed reactive components
US7712416Jan 21, 2009May 11, 2010Owen Oil Tools LpApparatus and method for penetrating oilbearing sandy formations, reducing skin damage and reducing hydrocarbon viscosity
US8122833Oct 4, 2006Feb 28, 2012Alliant Techsystems Inc.Reactive material enhanced projectiles and related methods
US8220394Oct 8, 2004Jul 17, 2012Qinetiq LimitedOil well perforators
US8544563Feb 18, 2008Oct 1, 2013Qinetiq LimitedOil well perforators
DE10251676B4 *Nov 7, 2002Jun 6, 2007TDW Gesellschaft für verteidigungstechnische Wirksysteme mbHFokussierte Unterwasserladung
EP1682846A2 *Oct 21, 2004Jul 26, 2006Owen Oil Tools LPApparatus and method for penetrating oilbearing sandy formations
EP2439482A2 *Oct 21, 2004Apr 11, 2012Owen Oil Tools LPApparatus and method for penetrating oilbearing sandy formations, reducing skin damage and reducing hydrocarbon viscosity
WO2001025717A1 *Sep 29, 2000Apr 12, 2001Kevin Mark PowellHollow charge explosive device particularly for avalanche control
U.S. Classification102/476
International ClassificationF42B12/02, F42B1/00, F42B1/032, F42B12/44
Cooperative ClassificationF42B12/44, F42B1/032
European ClassificationF42B12/44, F42B1/032