Ordnance – Shields – Shape or composition
Patent
1996-07-19
1998-06-16
Johnson, Stephen M.
Ordnance
Shields
Shape or composition
109 80, F41H 704
Patent
active
057674353
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The technical scope of the present invention is that of splinterproof linings which are placed behind the wall of an armoured structure or vehicle so as to reduce its vulnerability.
Splinterproof linings are mostly used today in armoured troop transport vehicles or infantry combat vehicles. Their purpose is to reduce the angle of the splinter cone generated when the vehicle's armour is pierced by an anti-tank projectile of the kinetic-energy (discarding-sabot) or especially shaped charge dart type. Given the technical scope under consideration, it is easy to understand that there is little bibliographical data describing these linings.
However, it is known that a composite panel with organic matrix and fibres (aramid or polyethylene) or mineral fibres (glass) at a distance of 100 to 360 mm approximately from the inner wall of the vehicle. The main disadvantage of this solution lies in its relatively large bulk which causes a substantial decrease in the inner volume of the vehicle.
Another technology is also known which consists in placing a plate, approximately 50 mm thick, of solid organic material (polyethylene, for example) against the inner wall of the vehicle, which partly absorbs the splinters produced by the wall. However, it generates, when attacked, secondary splinters which are undetectable in the human body by X-ray.
U.S. Pat. No. 5,200,256 is known disclosing a multi-layer laser assembly designed to stop projectiles from small or medium calibres fire arms made up of a first layer of steel, followed by a layer of composite material, a metal mesh and lastly a layer of foam applied onto the structure. This lining is placed outside the structure and forms the armour plating itself and not a splinterproof lining.
Patent WO-A-91 00490 is also known disclosing a multi-layer assembly which is also designed to stop small and medium calibre projectiles in a similar way to the previous patent.
Patent EP-A-0 588 212 is also known relating to a solid type splinterproof lining, placed, as in the invention, against the inner wall of a structure. The lining described comprises, however, several layers made from the same constitutive materials, i.e. an organic matrix in which tungsten particles are incorporated. The impact impedence provided by the layers gradually decreases, in other words the under-layer placed against the structure has a high value near to that of the structure itself.
SUMMARY OF THE INVENTION
The aim of the present invention is to propose a light weight splinterproof lining which is as effective as solid linings but which is considerably thinner by using materials having a much lower density than metals.
The subject of the invention is thus a splinterproof lining for an armoured vehicle notably comprising a adhesive layer of solid organic material placed against the inner wall of the vehicle, characterised in that it comprises an adjacent layer made of a composite material with organic matrix and mineral or organic reinforcement placed in the immediate vicinity of the adhesive layer and between approximately 2 and 30 mm thick.
According to one characteristic of the invention, the adhesive layer of solid organic material is chosen from the group made up of polyethylene, polypropylene, a plate of polyethylene or aramid filaments, a rubber, and is between approximately 2 and 45 mm thick.
According to another characteristic of the invention, the splinterproof lining comprises an absorbing layer of particles chosen from the group made up of a composite material with organic matrix and binder and a plastic film and is between approximately 1 and 5 mm thick.
According to one embodiment of the invention, a dispersion zone between approximately 2 and 30 mm thick filled with a liquid or gaseous fluid, or a polystyrene or polyurethane foam is placed between the adhesive layer and the adjacent layer.
According to a preferred embodiment of the invention, the splinterproof lining comprises: reinforced by glass fibres, approximately 30 mm thick, and
According to a second em
REFERENCES:
patent: 4934245 (1990-06-01), Musante et al.
patent: 5200256 (1993-04-01), Dunbar
patent: 5402703 (1995-04-01), Drotleff
patent: 5440965 (1995-08-01), Cordova et al.
Giat Industries
Johnson Stephen M.
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