Today in 1957, US Patent 2818185 A was issued, an invention of Carl F. Mickey and Lawrence E. Mickey, for their “Dispenser Truck Body For Beer Kegs.” There’s no Abstract, although in the description it includes these claims:

The primary object of the present invention resides in the provision of a dispenser truck body for beer kegs to facilitate loading and unloading of beer kegs by loading and unloading from the outside by means of racks and a chain to control and release the beer kegs.

A further object of the invention resides in the provision of a truck body which is so arranged as to enable beer kegs to be placed in the truck body through a raised opening and which will permit the dispensing of the beer kegs in a convenient manner with complete control so that the beer kegs may be removed or replaced with a minimum possibility of accidents which may result in injuries to persons loading or unloading the beer kegs.

An additional object of the present invention resides in the provision of means for lowering either full or empty beer kegs whereby the empty beer kegs may be quickly lowered by means of a spring mechanism yet which includes a shock absorbing means for slowly and safely lowering full beer kegs.