Patent ID: 8727459

Claim:
A multiple-door switchgear cabinet mountable to a storage and retrieval device, the switchgear cabinet comprising: a cabinet housing containing electrical equipment and being connectable to an electrical power source; a first door and a second door, the two doors attached to the cabinet housing and providing access to the electrical equipment, the first door, when closed, providing electrical continuity through a main electrical power switch, and removing electrical continuity when the first door is open, wherein said doors are independently openable with respect to each other; a mechanical interlock for controlling the order in which the doors are closed, the mechanical interlock being mounted to the cabinet and in communication with each of said doors when said doors are closed; the mechanical interlock comprising: a shaft rotatably mounted to the cabinet and in proximity to each of the two doors; and two contact levers fixedly attached to the shaft, the number of contact levers corresponding to the number of cabinet doors, the spacing of the contact levers corresponding generally to the spacing of the doors; wherein the contact lever corresponding to the first door includes a shaft end attached to the shaft and a terminal end opposite the shaft end the terminal end having a rigid flag attached thereto; and a locking bar movably attached to the first door, and releasably attached to the second door, wherein attachment to the second door prevents both doors from inadvertent opening.