Patent ID: 8883071
Filing Date: 2014-11-11
Classification: B22D,F27D

Abstract:
1. A molten metal containment structure, comprising: a vessel having an internal volume for containing molten metal and an open upper end; and a cover for the vessel having an underside facing said internal volume, said cover being movable between a closed position, covering said open upper end of the vessel with the underside of the cover, and an open position in which said cover is remote from said open upper end of the vessel to allow access to the internal volume from one side of the structure; wherein said cover is attached to at least one elongated lifting arm and at least one elongated rotation control arm, wherein the at least one elongated lifting arm and the at least one elongated rotation control arm are attached to the vessel; wherein the at least one lifting arm is configured to rotate along a first path to guide the cover from said closed position to said open position, and vice versa, and wherein the at least one rotation control arm is configured to rotate along a second path that is substantially parallel to the first path to control pivoting of the cover from a generally horizontal position during movement from said open position to said closed position, and vice versa, to prevent exposure of said underside of the cover to a person positioned adjacent to the structure at said one side, and wherein said at least one lifting arm or said at least one rotation control arm provides a force that at least partially counterbalances a weight of the cover.