Inertial igniters for low-G and long duration firing acceleration munitions and the like

An inertial mechanism comprising:

• an activating mechanism;
• and
• a time delay mechanism coupled to the activating mechanism for delaying a time in which the activating mechanism is activated after a predetermined acceleration profile occurs;
• the activating mechanism comprising:
• a first mass body movable between a first position and a second position, the first mass body having a first surface and a second surface;
• a first biasing member for biasing the first mass body in the first position;
• a second mass body movable between a third position corresponding to the first position of the first mass body and a fourth position corresponding to the second position of the first mass body, the second mass body having a third surface and a fourth surface engaged with the first surface of the first mass body when the second mass body is in the third position;
• and
• a second biasing member for biasing the second mass body in the third position;
• and
• the time delay mechanism comprising:
• a third mass body movable in a direction of acceleration, the third mass body having a fifth surface;
• a fourth mass body having a sixth surface for engaging with the fifth surface of the third mass body when the third mass body moves from a fifth position to a sixth position upon occurrence of the predetermined acceleration profile, the forth mass body having a seventh surface engaging with the third surface of the second mass body to activate the activating mechanism after a time delay;
• and
• a third biasing member for biasing the seventh surface towards engagement with the third surface;
• wherein the fifth and sixth surfaces are configured such that the fifth surface engaging with the sixth surface upon the occurrence of the predetermined acceleration profile causes the seventh surface to initially move away from engagement with the third surface before moving the seventh surface to engage with the third surface after the time delay;
• and
• the second surface of the first mass body is configured to one of:
• ignite a pyrotechnic upon occurrence of the predetermined acceleration profile;
• or
• one of open or close an electrical circuit upon occurrence of the predetermined acceleration profile.