Patent ID: 9611674
Date: 2017-04-04
CPC Classifications: B65D,E05B,E05C,Y10T

Claim:
1. An interlock assembly for a door latch mechanism of a door in a container for bulk material that has an interior lined with a membrane for holding fluid, said interlock assembly comprising: a plunger disposed within an aperture formed through the door, and movable between an extended position, wherein said plunger extends into the interior of the container, and a locked position, wherein said plunger is urged outwardly from of the interior of the container; a spring arranged to apply a force to urge said plunger to said extended position; a lock member coupled to move with said plunger between said extended position and said locked position, and wherein said force is selected to enable the membrane, under static pressure of fluid within the container, to urge said plunger to said locked position thereby engaging said lock member to interlock against operation of the door latch.