Abstract: A hatch assembly for vehicle roofs in which an opening is covered by a pair of panels disposed in side by side relationship to each other and being held in position by a latch system which permits the panels to be used in a partially open position or to be completely removed and stowed separately of the vehicle. The framed opening and panels incorporate a sealing system which diverts moisture away from the hatch assembly and allows drainage of water that does enter the hatch assembly.

Abstract: There is disclosed a silo door system designed to adapt older silo constructions for automated unloading, or to be employed as a general door system, if desired. The system includes a number of apertured panel sections clamped to the silo wall in aligned relationship, with door members for selectively closing said apertures. In addition, there is disclosed a double arm unloader chute positioning apparatus for maintaining alignment of an unloader discharge chute with the apertures in the panel sections.

Abstract: An end closure system for selectively opening and closing at least one preselected guideway in a treatment chamber. The end closure system includes a plurality of vertically aligned panels, each having opposite ends slidably engaged in vertically disposed guide means. Connecting means are provided on each panel for raising or lowering a preselected panel and any panel above a preselected panel to provide access to the preselected guideway or guideways or to seal the guideway or guideways. In one embodiment of the invention lifting means are provided for engaging the connecting means on the preselected panel to raise and lower the preselected panel and any panels above the preselected panel.