Patent ID: 7735620

Claim:
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 secured to the wall of the enclosure adjacent the access opening, the door frame having an exterior surface protruding outward from the wall, the exterior surface of the door frame being devoid of horizontal surface portions when the enclosure is oriented with the wall of the enclosure in a vertical position; 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, the access door having an exterior surface, the exterior surface being devoid of horizontal surface portions when the access door is in the closed position and the enclosure is oriented with the wall of the enclosure in the vertical position, the access door comprising a central region having a generally planar inner surface, the inner surface of the central region being generally coplanar with the inner surface of the wall of the enclosure when the access door is in the closed position, the access door comprising edge margins surrounding the central region of the access door, each edge margin having an inner surface that is oblique to the planar inner surface of the central region of the access door.