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Publication numberUS2348130 A
Publication typeGrant
Publication dateMay 2, 1944
Filing dateFeb 7, 1941
Priority dateFeb 7, 1941
Publication numberUS 2348130 A, US 2348130A, US-A-2348130, US2348130 A, US2348130A
InventorsHardy Jr Charles J
Original AssigneeHardy Jr Charles J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Armor plating
US 2348130 A
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Description  (OCR text may contain errors)

Patented ay 2, i944 ortica 3 Claims.

lvfy invention relates particularly to what is called laminated armor plating, that is, such plating as is built up of a plurality of layers, instead of consisting of a single layer; and objects of my invention are to increase the resistance of the laminated plating to a projectile; to decrease the penetrative power of a projectile striking the plating; to deflect the course of a projectile through the plating so as to diminish its penetrative effect; to scour or remove from the pro.- jectile grease or other similar substance calculated to assist its passage through metal; to diminish the site of the aperture in the back of the plate caused by a projectile passing through it; and to obtain the other` desirable results hereinafter set forth.

As is well known by those familiar with the art, when a soft jacketed steel cored projectile strikes a sheet of steel or similar armor plate substantially at right angles it will punch or drive out of the plate a disk or slug of metal substantially larger than the hard core of the projectile and will probably drive such disk or slug before it through the plating thus causing a hole which is substantially larger thanA the projectile itself. This result is probably due to the slug cr button of hard metal lying in a plane at right angles to the longitudinal axis of the projectile and being driven flatwise against the metal plating ahead of it. f there are a number of steel plates laminated together successive disks or slugs increasing in diameter with each plate are apt to be driven out of them so that the hole made by the projectile is considerably larger.

If, however, the slug can be tipped to one side or the other from its initial plane the projectile will tend to wedge past it and to bend to one side where the resistance of the slug may be least. This results in swerving the projectile from a direct course so that its line of force in the plating will be more or less oblique and will meet with greater resistance from the plating because of that fact. To accomplish this, I introduce between sheets of steel or other suitable hard metal armor a sheet of yieldable material, such, for instance, as rubber, and embed in pockets within the sheet localized quantities of hard, preferably granulated, material, such for instance, as dry sand, iron filings, emery and similar abrasives, held in local masses within the body of the rubber sheet, the rubber of which is sufliciently stili to retain its shape substantially while being inclosed between the hard metal plates after which it may be vulcanized by heat so as to cause it to adhere to the metal plates, holding them together, These pockets of abrasive material may be of any desired form but they are preferably disposed so that neither of them Will completely cross the path of a projectile piercing the armor plating. Consequently, when a projectile strikes the plate and drives before it the disk or slug referred to above, the slug Will not encounter uniform resistance before it because the portion of it which may impinge upon the pocket of abrasive material will be retarded, while the part which encounters only the rubber will go forward more readily, thus causing the disk to tip so that the nose of the projectile will tend to slip past it to one side, thus wedging in between the disk and the hard plating and offering increased resistance to the projectile, which will also be thrown ofi its direct line of force and directed more or less to one side, thereby further diminishing its effective force.

Furthermore, the effect of the abrasive on the hard core of the projectile will be to rub and scour off the grease or other lubricant which is usually placed around the projectile before it receives its soft metal coating. This still further impedes the projectile and diminishes its penetrative power, so that it results that the penetrative damage inflicted by the projectile will be materially diminished.

In the drawing, in all of which similar parts are designated by similar reference numerals, I have illustrated a piece of laminated armor plating made in accordance with my invention, Fig. l being a perspective view of a portion of such a composite plate, partly in section to better illustrate its construction, and Fig. 2 is a cross sectional view, taken as on the line 2 2 of Fig. l. Steel or other hard metal plates l, 2 form the two sides of the laminated plate; and between them is inclosed a layer of rubber 3, in which is formed a plurality of pockets 4, 4 lying within the mass of the rubber. These pockets do not open through the sides of the rubber sheet, which presents uniform, unbroken faces against the adjacent steel plates. These pockets 4, 4 are lled with an abrasive material 5, such as sand, with the result that the abrasive lies in isolated bodies within the rubber sheet and is not brought into direct contact with the steel armor plating, These pockets 4, 4 are shown in the drawing as being rectangular; but it should be understood that they may be cylindrical or of other unitary form. It is preferable that they be disposed more or less regularly throughout the rubber sheet, although groups of them may be separated from adjacent pockets by webs 6, 6 of increased width to aiord greater support to the rubber plate in uniting the steel plates. When the rubber sheet has been placed between the steel armor plating it may be vulcanized by applied heat so as to cause it to adhere to the steel plates holding them in properly assembled relation.

It should be understood that additional rubber sheets similar to the one above described may be inserted between successive layers of steel plates to increase the thickness and resistance of the laminated plating; for, as already pointed out, the upsetting of the slugs punched from the hard metal plates and the scouring and resisting action of the abrasive will continue to occur as the hard core of the projectile encounters successive layers of hard metal.

I wish it to be understood that the embodiment of my invention that I have described is to be considered as typical and not as exclusive', for

details may be varied, as by the use of equivalents, without departing from the spirit of my invention or the scope of my claims.

Having thus described my invention what I claim and desire to secure byV Letters Patent of the United States is:

1. A projectile-resistant structure comprising at least two layers of armor plate between which is interposed a layer of relatively yieldable material in which are located isolated masses of material having abrasive qualities adapted to upset a disk or slug driven out of one plate before such disk 'or slug reaches the second plate.

2. A structure as specified in claim 1 in which the yieldable material is vulcanized rubber.

3. A structure as specied in claim 1 in which the abrasive material is sand.

CHARLES J. HARDY, JR.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3228361 *Jun 1, 1964Jan 11, 1966Avco CorpLightweight sandwich armor plating
US3324768 *May 22, 1950Jun 13, 1967Eichelberger Robert JPanels for protection of armor against shaped charges
US4835033 *Mar 1, 1988May 30, 1989General Dynamics Land Systems, Inc.Armor plate having triangular holes
US4857119 *Mar 1, 1988Aug 15, 1989General Dynamics Lands Systems, Inc.Carbiding, nitriding surface treatment
US5014593 *Oct 18, 1989May 14, 1991General Dynamics Land Systems, Inc.Perforated plate armor
US5533781 *Jun 20, 1994Jul 9, 1996O'gara-Hess & Eisenhardt Armoring Co., Inc.Armoring assembly
US5663520 *Jun 4, 1996Sep 2, 1997O'gara-Hess & Eisenhardt Armoring Co.Vehicle mine protection structure
US6477934Aug 30, 2000Nov 12, 2002Rheinmetall Landsysteme GmbhApparatus for protecting against the effect of land mine
US6779431 *Apr 4, 2002Aug 24, 2004Krauss-Maffei Wegmann Gmbh & Co. KgArrangement for protecting the crew of a military vehicle from mine explosion consequences
US7695053Oct 4, 2004Apr 13, 2010Bae Systems Survivability Systems, LlcLethal threat protection system for a vehicle and method
US7827897 *Dec 20, 2005Nov 9, 2010Protaurius AktiebolagLight ballistic protection as building elements
US7856762 *Sep 24, 2004Dec 28, 2010Ulf DeisenrothModular shelter system, particularly for transport of persons and/or objects
US7878104Sep 29, 2006Feb 1, 2011Armor Holdings, Inc.Armored shell kit and associated method of armoring a vehicle
US7905534Apr 13, 2010Mar 15, 2011Bae Systems Survivability Systems, LlcLethal threat protection system for a vehicle and method
US7934766Oct 16, 2009May 3, 2011Bae Systems Survivability Systems, LlcLethal threat protection system for a vehicle and method
US7992924Jan 26, 2011Aug 9, 2011Bae Systems Survivability Systems, LlcLethal threat protection system for a vehicle and method
US8091465 *Oct 7, 2008Jan 10, 2012Plasan Sasa Ltd.Armor module and an armor array used therein
US8205933Jan 26, 2011Jun 26, 2012Bae Systems Survivability Systems, LlcLethal threat protection system for a vehicle and method
US8246106Oct 16, 2009Aug 21, 2012Bae Systems Survivability Systems, LlcLethal threat protection system for a vehicle and method
DE1042430B *Oct 3, 1957Oct 30, 1958Ver Leichtmetallwerke GmbhBeschusssicherer Werkstoff
DE3122367C1 *Jun 5, 1981Dec 22, 1994Deutsche AerospaceWall for protection against shaped charges and kinetic-energy projectiles
EP0699887A2 *Sep 1, 1995Mar 6, 1996A.F.H. Investment Ltd.Ballastic laminated armour
EP1081452A2 *Jul 5, 2000Mar 7, 2001MaK System Gesellschaft mbHDevice for protection against land mines
EP1536199A1 *Nov 25, 2003Jun 1, 2005Sgl Carbon AgBallistic ceramic layer
WO1989008140A1 *Feb 17, 1989Sep 8, 1989Gen Dynamics Land Systems IncCase-hardened plate armor
Classifications
U.S. Classification109/84, 89/36.2
International ClassificationF41H5/04, F41H5/00
Cooperative ClassificationF41H5/0492, F41H5/04
European ClassificationF41H5/04, F41H5/04H