F - Mech Eng,Light,Heat,Weapons – 42 – B
Patent
F - Mech Eng,Light,Heat,Weapons
42
B
F42B 10/38 (2006.01) F42B 14/02 (2006.01)
Patent
CA 2444689
The present invention relates to a method and a device for improving- at least in part- the external ballisticds of primarily the type of artillery shells (1) that are fin-stabilised in their trajectory towards the target and thus have a slipping plastic driving band (6) which, during firing of the said shell from a designated barrel, constitutes the shell's direct contact with the inside of the barrel. The problem that it is the function of the present invention to resolve is that the slipping plastic driving band (6) normally detaches immediately outside the muzzle of the barrel used for firing, thereby leavingan open groove (4) that causes distrubing turbulence which is detrimental to the flight of the said shell. The solution to the problem herein proposed is based on a ring-shaped spring-loaded device (5) arranged between the driving band (6) and the bottom of the driving band groove (4) and which device is held pressed against the bottom of teh said driving band groove as long as the driving band (6) is in position but as soon as it detaches from the said driving band groove the said device deploys to re- assume a pre-determined original shape which completely fills the driving band groove (4) up to and level with the outer surface of the shell (1).
L'invention concerne un procédé et un dispositif pour améliorer, au moins partiellement, les paramètres ballistiques externes principalement d'obus d'artillerie (1) stabilisés par ailettes dans leur trajectoire en direction de la cible et possédant ainsi une ceinture de projectile en plastique dérapant (6), laquelle, lors de la mise à feu dudit obus par un canon désigné, assure le contact direct de l'obus avec l'intérieur du canon. Le problème est que normalement la ceinture de projectile en plastique dérapant (6) se détache normalement immédiatement à l'extérieur de la bouche du canon utilisée pour la mise à feu et laisse une rainure ouverte (4) induisant des turbulences perturbatrices nuisant à la trajectoire dudit obus. Pour résoudre ledit problème, on prévoit un dispositif annulaire à ressort (5) disposé entre la ceinture de projectile (6) et le fond de la rainure (4), ledit dispositif étant maintenu comprimé contre le fond de ladite rainure tant que la ceinture est en position, mais dès qu'elle se détache de ladite rainure, ledit dispositif se déploie et reprend sa forme originale prédéterminée, si bien qu'il remplit la rainure (4) jusqu'à la surface extérieure de l'obus (1).
Bofors Defence Ab
Fetherstonhaugh & Co.
LandOfFree
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