The subject matter of this specification can be embodied in, among other things, a lock apparatus that includes a latch hook having a catch at a first latch end, a first pivotal mount at a second latch end opposite the first latch end, and a second pivotal mount, a rotary actuator configured to selectably rotate a rotor shaft in a first rotary direction and in a second rotary direction opposite the first rotary direction, a rotor arm coupled to the rotor shaft at a first arm end and extending radially outward from the rotor shaft to a second arm end opposite the first arm end, and a link arm pivotably connected to the second arm end at a first link end, and pivotably connected to the second pivotal mount at a second link end opposite the first link end.