Patent ID: 8166880

Claim:
A micro-machined or micro-engraved safety and arming device for a pyrotechnic train of a projectile to which axial spin is imparted after firing, said device comprising a substrate onto which a shutter to block a direction of an action of said pyrotechnic train is positioned, said shutter being mobile in translation on said substrate, said device in which said shutter being held immobile by at least two locks, a first lock, or axial acceleration lock, which is released further to the application of the acceleration communicated to said projectile during firing, and a second lock, wherein said second lock is a centrifugal lock that is released further to said projectile being made to spin, wherein said centrifugal lock comprises at least one locking finger integral with said substrate, said finger being held in an indentation in said shutter when said finger is in its locking position, said finger being held in place by a micro-machined centrifugal counterweight which is itself mounted able to slide in a housing in said shutter.