Patent ID: 7819062

Claim:
A device, comprising: a frame; a contact pad mechanically attached to the frame; and a first shuttle movably connected to the frame by one or more springs, wherein: the one or more springs include a first bowed spring; the first shuttle is adapted to move with respect to the frame in response to an inertial force; the device is adapted to electrically connect the frame and the contact pad; if a projection of the inertial force onto a designated axis is smaller than a first threshold value, then the frame and the contact pad are not electrically connected; if said projection reaches or exceeds the first threshold value, then displacement of the first shuttle produced by the inertial force causes the contact pad to be electrically connected to the frame; the first bowed spring comprises a beam whose shape, in an initial state, deviates from a straight shape; the beam has (i) an end attached to the first shuttle and (ii) a midpoint; and in response to the inertial force, the beam is adapted to deform so that a transverse displacement of the midpoint relative to the frame is larger than a corresponding displacement of the end relative to the frame along the designated axis.