Patent ID: 8511230

Claim:
A safety and arming device for a spin-stabilized explosive projectile, said device comprising: 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 having ends and obstructing said channel when the two half-screens are in contact with one another, wherein said two half-screens are configured to slide in a bore hole, which is perpendicular to the transmission channel and is carried by a rotor coaxial to said projectile, said rotor is configured to pivot with respect to a longitudinal axis of said projectile and carry said transmission channel, said two half-screens are locked into a position in which the two half-screens 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 two half-screens, said spiral spring unwinding under an effect of a centrifugal force and allowing the two half-screens to move to a position in which the two half-screens do not obstruct the transmission channel.