Patent ID: 7420133

Claim:
A door interlock mechanism for a circuit breaker actuated by rotation of an actuation shaft that is driven by a handle and is located in an enclosure having a hinged enclosure door, said door interlock mechanism comprising: a housing member for installation in the enclosure, the handle being mountable on a front side of said housing member with the rotating shaft extending from a back side of said housing member to the circuit breaker; a latch plate mounted in said housing member for pivotable movement about an axis between first and second positions, said latch plate being biased by gravity from said first position toward said second position, said latch plate having a notch located therein and a distal portion that extends from said housing member; a tongue fixedly attachable to and rotatable with the actuating shaft, said tongue extending laterally from the actuating shaft and being located in a longitudinal location on the actuating shaft whereby said tongue may be engaged by said notch on said latch plate; and a door hook fixedly attachable to the enclosure door, said door hook being engageable by said distal portion of said latch plate to retain the enclosure door in a closed position.