A contractible shape memory alloy (SMA) wire is used to throw a lever in a
latch. The SMA actuator provides weight and space savings. In one
embodiment, the SMA actuator is incorporated in the handle of the latch
in order to provide a child lock or double lock function. The handle has
a lever which includes a relatively short slot leg and a relatively long
slot leg. A toggle sits in the slot. At least one SMA wire is connected
to the toggle to move it between the relatively short slot leg, wherein
the lever is prevented from pivoting, and the relatively long slot leg,
where the lever is enabled to pivot. In another embodiment, the SMA
actuator is embedded in the latch itself, and used to throw a lever that
controls the child lock function.