Patent GB-489876-A (GB)
Title: Improvements in or relating to projectiles
IPC: A41B3/12
Filed: 1937-03-30
Abstract: 489,876. Ammunition projectiles. SAGEB SOC. ANON. DE GESTION ET D'EXPLOITATION DE BREVETS. March 30, 1937, No. 9083. Convention date, March 30, 1936. [Class 9 (i)] A projectile having a driving band situated at a distance of less than 1 calibre from the base and an internal cavity containing a combative charge, comprises a shell which, at its middle portion adjacent the centre of gravity of the projectile, is of homogeneous metal and is thicker than the front and rear portions of the shell, the projectile having an external contour which decreases continuously in diameter from the driving band to the convex forward end. According to one construction, Fig. 1, the projectile comprises a heavy portion 1 to which is attached a thinwalled ogive 2 of a light alloy. As shown, the walls of the portion 1 are thickened adjacent the centre of gravity G. The projectile is fitted with a driving band 4, a guiding band 5a which becomes detached from the projectile, during flight, and a fuze 6 adapted to ignite an explosive or other charge contained in the cavity 2b. In a modification, Fig. 3, the base of the projectile is extended to provide a chamber 9 which contains a propulsive charge. The forward end of the portion 1 is closed by a member 11 carrying a fuze 6a which is actuated by a striker 6b. Alternatively, a time fuze may be employed. In a modification, the base of the portion 1 carries a casing containing a rocket charge and fitted with a nozzle similar to that shown in Fig. 7. The projectile shown in Fig. 7 is of the sub-calibre type and is fitted with a thick driving band adapted to become detached from the projectile when the latter is in flight. The projectile has a chamber 16 containing a jet propulsion charge associated with a nozzle 17, and a further similar charge is contained in a compartment 24. The latter charge escapes through nozzles 25 and is adapted to impart a torque which increases or decreases the gyratory motion of the projectile. In a modification the chamber 16 comprises a casing which extends into the explosive charge and in a further modification the portion 1 contains only the rocket charge.. The Specification as open to inspection under Sect. 91 describes also a number of projectiles in which the forward end of the portion 1 has a pointed nose for armour piercing purposes. Projectiles discharged with and by one another from the same gun, and delay-action ignition devices for the rocket charge are also described. The projectile shown in Fig. 9 (Cancelled) comprises a portion 1 having an armour piercing nose and containing an explosive charge and a fuze 7. The ogive comprises a portion 2 of magnesium and a portion 2a, the latter having a central cavity 15 and an annular compartment 14. The cavity contains an explosive charge which is ignited, on impact, by a primer 6 and which is adapted to expel a charge of sodium, potassium or the like from the compartment 14 so as to give a visual indication of the point at which the projectile falls into the water. Modified forms of armour piercing projectiles and bullets are also described. Fig. 21 (Cancelled) shows a projectile 2 arranged within a forwardly extending sleeve of a projectile 1 from which it is expelled, during flight, by a propulsive charge 40 ignited by a time fuze 7. Modified constructions of this type of projectile are also described. In cases where the projectile is impelled by jet propulsion during flight, the rocket charge may be ignited by a delay-action composition associated with a primer and a striker which sets back by inertia. Alternatively, the gases from the propulsive charge may penetrate a hole 26a, Fig. 17 (Cancelled), to ignite a time fuze 27a which, in turn, ignites a charge 28a. The latter ignites the rocket charge and also expels a member 28 located within the nozzle, this member being formed with indentations 29 adapted to prevent the gases of the propulsive charge from reaching the rocket charge. This subject-matter does not appear in the Specification as accepted.