Abstract: A projectile has a central part relative to the longitudinal direction of the projectile which is the direction in which it is fired. The projectile contains a pyrotechnic charge in the form of two identical operational charges. These are offset longitudinally relative to the central part of the projectile and symmetrically disposed one on each side of this central part. The projectile further contains a device for initiating the pyrotechnic charge subject to a time-delay. This device is accommodated in the central part of the projectile and adapted to initiate the two operational charges simultaneously.

Abstract: A cartridge comprises a longitudinal tube having a transverse open end. A projectile is accommodated in and can slide longitudinally inside the tube. The projectile is ejected from the tube through the open end by sliding longitudinally relative to the tube. There is a pyrotechnic charge in the projectile. A device for securing delayed initiation of this charge comprises a fuse, a percussion member in the projectile movable between a retracted position in which it is removed from the fuse and a striking position in which it strikes the fuse, a device adapted to hold the percussion member temporarily in its retracted position and complementary mechanical devices on part of the projectile and part of the tube facing the path followed by this part of the projectile as it is ejected.

Abstract: This invention relates to the safety of ammunitions.The projectile of a cartridge has a base which houses a safety stop consisting of a transversely slidable valve. A device ensures that the valve cannot be released until the projectile has been subjected to a powerful acceleration. Another safety device very advantageously ensures that the pyrotechnical chain inserted in the base functions only when the pressure of the ejection charge has been able to release a sealing-block.In particular, the invention may be applied to infra red window releasing cartridges.