Abstract: An improved dock shelter comprising a pair of side panels and a top panel which are hinged to the dock and border a doorway in the dock. The panels are each biased to a storage position where the panel extends laterally outward from the dock. The panels are pivoted inwardly from the storage position to an operative sealing position by inflatable bags which are operably connected to the panels. A blower mounted above the doorway operates through a duct system to inflate the bags and pivot the panels into sealing engagement with the sides and top of a truck parked in front of the dock. When the loading operation is completed, operation of the blower is discontinued and the biasing mechanism acts to return the panels to the storage position. Corner panels are carried by the top panel and are mounted for flatwise sliding movement relative to the respective side panels.

Abstract: A hydraulically operated dockboard comprising a ramp which is hinged at its rear edge to the frame of the dockboard, and a lip is hinged to the forward edge of the ramp. A main hydraulic cylinder unit connects the frame and the ramp, and by operating the cylinder unit the ramp can be pivoted upwardly from a horizontal cross traffic position to an upwardly inclined position. A lip cylinder interconnects the ramp and the lip and acts to pivot the lip from a downwardly hanging pendant position to an extended position. A hydraulic line is connected to the lip cylinder, and a control valve interconnects the hydraulic line to either a supply line or a return line that is connected to the reservoir of the hydraulic system. The control valve is normally biased to a first position where the lip cylinder is connected to the return line.