Safety and arming device for projectiles inertial lock with MEMS technology
View Patent ↗The invention relates to a safety and arming device for projectiles and using micro-electromagnetic technology, such device incorporating a slider made mobile by the effect of the centrifugal acceleration with respect to the body of the device and immobilized in a safety position by at least one inertial lock, such lock incorporating at least one means to ensure its blocking in the unlocked position, wherein the inertial lock incorporates a counterweight having at least one straight groove whose longitudinal axis is parallel to the direction of movement of the lock, groove in which a fixed guiding pin integral with the safety and arming device is positioned, since the groove is of sufficient length to allow the displacement of the counterweight with respect to the pin, the slider in its safety position being made integral with the body of the safety and arming device by means of hooking means integral with the counterweight.
1. A MEMS safety and arming device for projectiles that each include a detonator and an explosive, said safety and arming device comprising:
a body;
a slider mobile between: a) a safety position in which the detonator is isolated from the explosive, and b) an arming position in which the detonator is able to communicate with the explosive; and
at least one inertial lock;
wherein the slider is configured to be mobile under the effect of a centrifugal acceleration with respect to the body,
wherein the slider is immobilized in said safety position by the at least one inertial lock configured to release the slider when moving in an unlocked position in which the at least one inertial lock is blocked by a blocking system,
wherein said at least one inertial lock includes a counterweight having at least one straight groove whose longitudinal axis is parallel to a direction of movement of said at least one inertial lock, wherein a fixed guiding pin is positioned in said groove, said guiding pin being integral with said body, wherein said groove is of a length sufficient to allow the displacement of said counterweight with respect to said guiding pin, and
wherein a hooking system is integral with said counterweight, and said slider is maintained in said safety position by said hooking system.
2. The MEMS safety and arming device according to claim 1 , wherein said hooking system comprises at least one first spigot corresponding with at least a first hook shape integral with said slider and at least a second spigot corresponding with at least a second hook shape integral with said body of said safety and arming device, said first and second spigots being oriented in the same direction, the ends of said spigots being oriented in a direction opposite of a direction of movement of said counterweight of said inertial lock moving toward said unlocked position.
3. The MEMS safety and arming device according to claim 1 , wherein said guiding pin comprises a rectangular section substantially occupying the full width of said groove.
4. The MEMS safety and arming device according to claim 1 , wherein said counterweight is suspended between at least two springs whose principal strain axis is parallel to the direction of movement of said inertial lock.
5. The MEMS safety and arming device according to claim 2 , wherein said guiding pin comprises a rectangular section substantially occupying the full width of said groove.
6. The MEMS safety and arming device according to claim 2 , wherein said counterweight is suspended between at least two springs whose principal strain axis is parallel to the direction of movement of said inertial lock.
7. The MEMS safety and arming device according to claim 3 , wherein said counterweight is suspended between at least two springs whose principal strain axis is parallel to the direction of movement of said inertial lock.
8. The MEMS safety and arming device according to claim 1 , wherein said blocking system comprises notches of the body intended to block tongues of the counterweight.