Safety and arming device for a spin-stabilised explosive projectile and a priming device implementing such a safety and arming device

A safety and arming device for a spin-stabilized explosive projectile, said device incorporating a screen obstructing a transmission channel linking a detonator and a pyrotechnic relay, said screen being constituted by two half-screens able to move with respect to one another and transversally with respect to said transmission channel, said two half-screens obstructing said channel when they are in contact with one another, wherein said two half-screens are mounted able to slide in a bore hole carried by a rotor coaxial to said projectile, said rotor which is itself mounted able to pivot with respect to the axis of said projectile and which carries said transmission channel, said two half-screens being furthermore locked into the position in which they obstruct said transmission channel by at least two locks, a first lock or inertial lock which retracts when said projectile is fired and a second lock or centrifugal lock that is formed by a spiral spring surrounding an external cylindrical surface of said rotor and thus applied against the ends of said half-screens, said spiral unwinding under the effect of the centrifugal force.