Today in 1949, US Patent 2466892 A was issued, an invention of Stanley B. Holmes, for his “Beer Tap.” There’s no Abstract, but the description says simply it’s an “invention relat[ing] to beer taps:

First: To provide a beer tap which is adapted to interlock with the conventional latching means provided on beer kegs in a manner to form a sealing connection between the keg and a delivery tube.

Second: To provide a beertap which may be readily and quickly connected or disconnected with a minimum of effort without the aid of tools but which, when connected, cannot read– ily be accidentally loosened.

Third: To provide a beer tap which is particularly simple in its construction and readily cleaned.

Fourth: To provide a beer tap which includes a mounting structure which may be installed or removed without the delivery tube in place, and wherein the delivery tube may be inserted or removed without disturbing the connection between the mounting structure and the beer keg, or, if desired, both may be removed or installed simultaneously, the delivery tube remaining fixed in its position.