Patent ID: 8291825

Claim:
A safety and arming apparatus for use with a projectile, comprising: a housing; a rotor coupled to the housing and pivotable about an axis between a safe position and an armed position, the rotor including a spin-lock engagement structure on a side surface of the rotor and a setback engagement structure; a first biasing element coupled to the housing and for holding a mass engaged with the setback engagement structure to restrain the rotor from rotation, the first biasing element deformable to allow the mass to displace and disengage from the setback engagement structure upon an axial acceleration of the projectile and permit rotation of the rotor; a second biasing element including a fixed end coupled to the housing and a displaceable end for engaging with the spin-lock engagement structure on the rotor to restrain the rotor from rotation, the second biasing element deformable to disengage the displaceable end from the spin-lock engagement structure upon a centrifugal acceleration of the projectile and permit rotation of the rotor; and a piston actuator coupled to the housing for activation against the rotor to rotate the rotor to the armed position upon receipt of an electrical signal if the mass is disengaged and the displaceable end of the second biasing element is disengaged.