An anti-tip lock assembly for a storage compartment includes a pair of geared actuators mounted on a base abutting against a follower. The follower and the base are configured to travel a limited distance along a vertical track installed in a storage unit. When the compartment is closed, the actuators are aligned with the track. When the compartment is opened, the actuators are moved out of alignment to block access to the moving components of the assembly. When the anti-tip lock assembly is operational, the array of like anti-tip assemblies in the track allow displacement of only one pair of actuators to occupy the limited distance at one time. A security bar array interacts with the actuators and other assemblies in the storage unit, to prevent simultaneous opening of two or more compartments. The security bar is provided with the track to lock and unlock the assembly.