A lock device has a pair of locking elements with internal locking teeth, a pair of shafts with external locking teeth configured for meshing engagement with the internal locking teeth, a pair of housing portions configured to receive and retain the respective shafts, and a case configured to receive the locking elements. The locking elements are permitted to undergo sliding movement within the case between first and second states of the lock device. In the first state, the internal locking teeth of the locking elements are disposed in respective meshing engagement with the external locking teeth of the shafts so that the case cannot undergo rotational movement relative to the shafts. In the second state, the internal locking teeth of the locking elements are not disposed in meshing engagement with the external locking teeth of the shafts so that the case can undergo rotational movement relative to the shafts.