Abstract: A coal crushing facility having a coal crusher with an inlet feed chute and a feeding mechanism interposed between the crusher and a storage hopper wherein a top wall of the feed mechanism discharge chute includes a hinged door which is responsive to backup of coal in the crusher inlet chute to open slightly and effect operation of a proximity switch to shut down the feed motor. The circuit for the feed motor control may have a manual switch interposed therein to effect restarting of the feed motor only at will. The door may be moved to a full open position to provide a large opening to bring into operation a hydraulic breaker for breaking up large chunk coal and unclogging the feed chute. The door may be moved between open and closed positions by a motor operated winch.

Abstract: A dust collector housing or baghouse is modified to provide for the removal of increased length filter bags and support cages by providing a removable roof section which is connected to the main housing section by cooperating inwardly projecting flanges formed on the upper transverse edge of the housing section and a lower depending side wall of the roof section. The flanges are accessible from the clean air plenum within the baghouse for insertion and removal of flange connecting bolt assemblies.