Ammunition and explosives – Cartridges – Telescoping powder charge
Patent
1994-10-24
1995-07-18
Tudor, Harold J.
Ammunition and explosives
Cartridges
Telescoping powder charge
102430, 102464, F42B 5045
Patent
active
054331480
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The scope of the present invention is that of casings for telescoped-type munitions.
Patent FR2679991 features a telescoped-type munition having a casing composed of plastic material, blocked at each end by a plug, also made of plastic material.
Choosing plastic material for the casing makes it easier to unload after firing. In fact the plastic casing does not present any residual radial deformation.
However, the problem arises of the mechanical resistance of the plugs under firing, the plugs also acting as a seal for the propellent gases.
Patent FR2679991 proposes providing metal reinforcing structure for the part of the plugs situated to the outside of the casing envelope. This reinforcing structure is composed of a ring which may be completed by a base plate.
However such reinforcing structure proves to be insufficient to deal with the pressure build-up of the propellent gases generated during firing. A plastic flow of the constituent material of the plugs can be observed, in that case, between the envelope and the reinforcing structure, this material thereafter forming a small wad likely to make unloading the casing more difficult.
Moreover, regarding the front plug, material constituting the plug has been torn off by the projectile.
SUMMARY OF THE INVENTION
An object of the invention is to provide a casing in plastic material designed for a telescoped munition, a casing wherein the mechanical resistance of the plugs under firing has been improved.
Thus, an object of the invention is to provide a casing for telescoped-type munitions composed of a cylindrical envelope in plastic material blocked at each end by a plug in plastic material fitted with metal reinforcing structure comprising a peripheral cylindrical part and an outer edge or base, reinforcing structure that entirely covers one end of the plug projecting from the envelope, a casing including at least one ring-shaped hollow, fitted in the plug near to one end of the envelope which is in contact with the reinforcing structure, a hollow designed to absorb the deformation of the plug under firing thereby avoiding the formation of a wad.
The reinforcing structure shall be composed of a metal ring for the front plug comprising a peripheral cylindrical part and an outer edge and a metal plate for the rear plug comprising a base and a peripheral cylindrical part.
In entirely covering the top end of the front plug, the ring ensures that this part of the plug, designed to come into contact with the gun, is held in place.
The cylindrical part and the outer edge prevent a ring-shaped wad from forming in the front part of the casing during firing. The ring-shaped hollow absorbs the deformation of the plastic material of the plug thereby preventing a wad from forming between the casing and the reinforcing structure of the plug.
In a similar way, the plate entirely covers the bottom end of the rear plug and ensures that this part of the plug, designed to come into contact with the gun, is held in place.
The cylindrical part and the base thereby prevent a ring-shaped wad from forming at the rear of the casing, the ring-shaped hollow absorbing the deformation of the plastic material of the plug.
According to one particular embodiment of the invention, the ring-shaped hollow is marked out by two ring-shaped surfaces roughly flattened and perpendicular to the axis of the munition, one supported by the reinforcing structure, the other by the plug.
According to a further characteristic the reinforcing structure is made integral with the plug by catching a ring-shaped rim on the ring in a peripheral groove of the plug.
The external diameter of the reinforcing structure is at least equal to that of the nominal diameter of the envelope at the maximum operational temperature of the munition.
According to a further characteristic of the invention, there is at least one internal ring-shaped cavity provided between the front ring and the reinforcing ring in such a way as to absorb the axial and radial deformations of the plug caused by th
REFERENCES:
patent: 676000 (1901-06-01), Henneberg
patent: 3842739 (1974-10-01), Scanlon et al.
patent: 3897729 (1975-08-01), Schirneker
patent: 4691638 (1987-09-01), Meyer et al.
patent: 5127331 (1992-07-01), Stoops
Barratault Bruno
Baubois Michel
Boual Roland
Giat Industries
Tudor Harold J.
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