Ammunition and explosives – Shells – With secondary shells
Patent
1989-12-01
1991-10-08
Brown, David H.
Ammunition and explosives
Shells
With secondary shells
102388, 102393, 102400, F42B 1050
Patent
active
050544004
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a separating aerodynamic braking device applicable in particular to the base or rear section of a projectile having a fast rotational motion. This device is deployed on the trajectory of a carrying projectile at a certain distance from the ground and provides the braking of this body.
The principal application of this device can be carried out on a projectile containing payloads and whose release is carried out by the separation of the forward section and the rear section, held in contact in particular by a pin system, by means of the action of propulsion gas located at the front of the projectile; this separation having taken place, the rear section of the projectile under the effect of aerodynamic forces tends to remain in the vicinity of the payload and thus risks causing problems during subsequent sequences: possibility of collision with the payload travelling in front of it . . . In order to avoid this phenomenon, it is necessary to increase the aerodynamic drag of the rear section of the projectile, preferably accompanied with an impulse to initiate the separation.
It is known to achieve the braking of the rear section of the projectile by means of a parachute; the latter is positioned inside the projectile before the phase of separation of the two sections, front and rear, of the projectile and is attached to the rear section by straps strong enough to resist the forces produced on them. The disadvantages of this type of device are on the one hand the size of the rear section of the projectile which requires a large housing in order to position the parachute and, on the other hand, the fact of using a parachute, in each projectile launched, considerably increases the cost price of the projectile.
Furthermore, another device which is used for the braking of the rear section of a projectile is a device comprising a braking element constituted from a cloth or a sheet of plastic material placed inside a cavity located in the rear section of the projectile and attached to the latter by fixing means. The deployment of this braking element is caused by the rotation of the rear section. The disadvantages of this type of device are, on the one hand, the size of the rear section of the projectile which thus limits the number of sub-munitions located inside the projectile and, on the other hand, its inefficiency in braking projectiles having a low speed of rotation.
The principal object of the invention is on the one hand to separate two bodies and, on the other hand, to brake one section at least of a mobile element while overcoming the above disadvantages.
The object of the invention is a device for separating at least two bodies having a rotational motion, characterized in that thin blades made from a material providing plastic deformation, integral with at least a first body, are fixed by one of their ends to the periphery of this said body by a fixing system in such a way as to be disposed, before separation, at the periphery of the said body and, during the separation, is deployed under the effect of centrifugal and aerodynamic forces ensuring the separation of the two bodies and the braking of the first body.
The invention and its characteristics will be better understood on reading the following description of a particular embodiment given with reference to the appended figures in which:
FIG. 1 is a cross-section of the rear section of a projectile before the separation phase according to the invention;
FIG. 2 is a cross-section of the rear section of a projectile during the separation phase according to the invention;
FIG. 3 is a cross-section of the rear section of a projectile after the separation phase according to the invention;
FIG. 4 is a cross-section of the rear section of a projectile before the separation phase according to another embodiment than that of the invention;
FIG. 5 is a cross-section of the rear section of a projectile after the separation phase according to the device in FIG. 4;
FIG. 6 is a cross-section of the rear section of a projectile after the sepa
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Frehaut Jean-Pierre
Kerdraon Philippe
Pineau Jean-Pierre
Brown David H.
Plottel Roland
Thomson-Brandt & Armements
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