Multi-stage mechanical delay mechanisms for inertial igniters for thermal batteries and the like having a rotatable movable member

An inertia igniter comprising:

• a mechanical delay mechanism having two or more members and a movable member, the two or more members being movable upon at least one of an increasing magnitude and duration of an acceleration to sequentially move the movable member upon sequential movement of the two or more members;
• and
• an ignition member actuatable by the movable member such that rotation of the movable member by the two or more members ignites the ignition members;
• wherein the two or more members are two or more finger members, each cantilevered from a housing at the one end and free to deflect at an other end.

A mechanical delay mechanism comprising:

• two or more members, at least one end of each of the two or more members being sequentially movable upon at least one of an increasing magnitude and duration of an acceleration event;
• a movable member rotatable in an actuation direction by the sequential movement of the two or more members, the movable member preventing each of the two or more members from moving until a previous one of the two or more members has moved the movable member a predetermined distance to release a subsequent one of the two or more members;
• and
• a biasing member configured to bias the movable member opposite to the actuation direction when the movable member rotates less than a predetermined amount and to bias the movable member in the actuation direction when the movable member rotates more than the predetermined amount.