Dust Buildup Resistant Access Door and Door Frame of a Bulk Material Handling System

A bulk material handling system comprising:

• an enclosure adapted for the passage of bulk material, the enclosure comprising a wall having an inner surface and an outer surface, the inner surface of the wall in part defining an interior of the enclosure, the wall including an access opening for providing access to the interior of the enclosure;
• a door frame comprising a plurality of door frame segments, each of the door frame segments comprising a length of angle iron having first and second panels, the first panel of each door frame segment comprising opposite central and outer edges, the second panel of each door frame segment comprising opposite central and outer edges, the central edges of the first and second panels of each door frame segment being coextensive with each other and constituting an apex of the corresponding door frame segment, each door frame segment being secured to the wall of the enclosure and adjacent the access opening such that the apex of such door frame segment protrudes outward and away from the interior of the enclosure, the outer edges of the first and second panels of each door frame segment lying in a plane that is between the apex of the corresponding door frame segment and the interior of the enclosure;
• an access door releasably secured to the door frame, the access door being movable between a closed position and an open position, the access door being surrounded by the door frame and covering the access opening when the access door is in the closed position, the access door being spaced from the door frame sufficient to allow a user to access the interior of the enclosure via the access opening when the access door is in the open position.

A bulk material handling system comprising:

• an enclosure adapted for the passage of bulk material, the enclosure comprising a wall having an inner surface and an outer surface, the inner surface of the wall in part defining an interior of the enclosure, the wall including an access opening for providing access to the interior of the enclosure;
• a door frame comprising a plurality of door frame segments that in combination generally surround the access opening in the wall of the enclosure, each door frame segment comprising a generally planar outwardly facing first surface portion and a generally planar outwardly facing second surface portion, the first surface portion of each door frame segment comprising opposite central and outer edges, the second surface portion of each door frame segment comprising opposite central and outer edges, the central edges of the first and second surface portions of each door frame segment being coextensive with each other and constituting an apex of the corresponding door frame segment, each door frame segment being secured to the wall of the enclosure such that the apex of such door frame segment protrudes outward and away from the interior of the enclosure, the outer edges of the first and second surface portions of each door frame segment lying in a plane that is between the apex of the corresponding door frame segment and the interior of the enclosure;
• an access door releasably secured to the door frame, the access door being movable between a closed position and an open position, the access door being surrounded by the door frame and covering the access opening when the access door is in the closed position, the access door being spaced from the door frame sufficient to allow a user to access the interior of the enclosure via the access opening when the access door is in the open position.