Today in 1877, US Patent 192539 A was issued, an invention of John Staugler, for his “Improvement in Beer-Coolers.” There’s no Abstract, although in the description it includes this summary:

This invention consists in the peculiar construction of’ a cooling-box, resting on a frame or horse, with a rounded cover hinged to the box.

The shape of the box, and especially the cover, follows the form of the cask as closely as convenient, and leaves only in the lower part of the box sufficient space to put in a few pieces of ice, for the purpose of keeping the contents of the cask cool while on draft.