Ammunition and explosives – Cartridges – Telescoping powder charge
Patent
1994-10-13
1995-11-21
Tudor, Harold J.
Ammunition and explosives
Cartridges
Telescoping powder charge
102430, 102439, F42B 5045
Patent
active
054677165
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The scope of the present invention is that of telescoped-type munitions.
These munitions usually comprise a casing composed of a cylindrical tube, having a plug at each end, in which a projectile and propelling charge are placed.
The projectile is entirely enclosed by the casing and means to ensure that it is held in its position, axially and radially, with respect to the casing envelope must be provided.
Patent FR2679991 describes different means enabling the projectile to be held axially with respect to the envelope.
These means can comprise a rear stop carried by a primer and a front stop constituted by an elastic ring placed in a groove of the front plug.
There are several disadvantages to this solution.
When the munition is being fired the front and back plugs move with respect to the envelope with the danger of causing the projectile to tilt thereby impeding the correct loading of the projectile in the gun barrel.
Document FR2679991 describes other holding means which combine a stop surface fitted on the front plug and an elastic ring placed in a groove in the same plug.
The problem wherein the projectile tilts when the plugs move is thereby avoided.
However, firing tests have demonstrated that the use of an elastic ring was causing disturbances in the projectile.
In fact such rings are usually fitted with a slit enabling them to be inserted into a groove and this slit constitutes an asymmetric band on the ring.
When the projectile is fired the ring does not fracture symmetrically because of its slit. This causes a shock to the projectile which does not follow the axial direction of the latter.
Such a shock disrupts loading in the gun barrel and the later ballistic reaction of the projectile.
SUMMARY OF THE INVENTION
One object of the invention is to provide a telescoped munition comprising axial holding means for the projectile which provide an efficient holding capacity as well as ensuring the smooth release of the projectile upon firing.
These holding means are also of a simple form and enable the projectile to be easily inserted into the casing.
According to one object of the invention there is provided a telescoped-type munition comprising a casing, composed of a cylindrical tube blocked at each end by a plug, in which a projectile and a propelling charge are placed, a munition comprising structure to ensure that the projectile is held in place axially with respect to the envelope, a munition characterized in that the axial holding structure comprises a cap composed of a cylindrical central part integral with a front part of the projectile and fitted with a ring-shaped collar which is made integral with the front plug by fastening means.
According to another characteristic, the ring-shaped collar serves to seal the front of the envelope.
According to a first variant, the fastening means are composed of the welding of the collar onto the front plug.
According to a second variant, the front plug is fitted with a metal reinforcing ring and the fastening structure is composed of the pinching of the collar between the ring and the front plug.
In one preferred embodiment, the cylindrical central part of the cap is fitted with axial slits evenly distributed at an angle as well as corner-shaped segments fitted to one end and designed to be housed in a groove of the projectile as to make the cap integral with the projectile.
According to another characteristic of the invention, the ring-shaped collar is provided with the starting point of a fracture.
This fracture starting point may be a thinning around the collar, wherein the diameter is roughly equal to that of the cylindrical central part of the cap.
In the event that the projectile comprises a sub-caliber shaft placed in the boring of a sabot to caliber, the cap can be made integral with a front part of the sabot on a level with the boring.
In the event that the projectile is fitted with an ogive on its front part whereon is fixed a nose cone comprising a cylindrical outer profile enabling it to be fitted into the fron
REFERENCES:
patent: 2996988 (1961-08-01), Kunz
patent: 2996998 (1961-08-01), Gold et al.
patent: 3272982 (1993-12-01), Desevaux
patent: 3482516 (1969-12-01), Farmer et al.
patent: 3897729 (1975-08-01), Schirneker
patent: 4770098 (1988-09-01), Stoner
patent: 5069137 (1991-12-01), Martwick
patent: 5173571 (1992-12-01), Montgomery
patent: 5192829 (1993-03-01), Suire
patent: 5265540 (1993-11-01), Ducros et al.
Giat Industries
Tudor Harold J.
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