Today in 1914, US Patent 1121930 A was issued, an invention of Lewis V. Mather, assigned to Enameled Steel Package Corp., for his “Metal Keg or Cask.” There’s no Abstract, although in the description it includes this summary:

This invention relates to kegs or casks and has for its object a cask in which the hoops and the head rings are applied to the shell in an improved manner.

This invention consists essentially in the utilization of spring tongues on the shell or staves of the cask which spring out and lock with the hoops and the. head rings when the latter have been slipped into place.