Actuator activated by transversal acceleration

An actuator primarily activated by transversal acceleration arising from rotational acceleration of a rotatable object, wherein the object is rotatable in a plane of rotation (P) about an object pivot point in the plane of rotation (P), the actuator comprising:

• at least two bodies adapted to be rotatably, in or parallel to the plane of rotation (P), coupled to the object at a body pivot point of each body, wherein the body pivot point and/or the body is arranged such that a mass distribution of the body is nonuniform about the body pivot point, and
• at least one coupling arrangement arranged to operatively couple at least two of said at least two bodies, wherein
• due to said nonuniform mass distribution about the body pivot point, the actuator is configured to transition to an activated state, in response to rotational acceleration of the object, by said at least two bodies rotating about their respective body pivot points in a direction opposite to a direction of said rotational acceleration of the object.