Today in 1989, US Patent 4837156 A was issued, an invention of Leo K. Lampinen, for his “Tilting Lauter Tun.” Here’s the Abstract:

A vessel has a central longitudinal axis, a pair of trunnions defining a tilting axis, and a fixed bottom and a false bottom. The false bottom comprises at least one screen. At least one of the screens is affixed to the vessel by a plurality of hinges so as to allow the screens to freely swing from a first position to a second position as said vessel is tilted about the tilting axis.