Pass-Through Barrel Churn: A Twisted-Wing Dasher That Comes Out Whole Through a Hatch

Spain set out to keep "the cream when it becomes thick, from revolving with the dasher," and to get the whole dasher out through a small hatch for cleaning. Edward Spain of Philadelphia, Pennsylvania, received US 5,585, dated 16 May 1848, for a barrel churn whose dasher has four beating wings, each broader at one end than the other, joined to a long and a short bar crossed at each end, the long arms at one end opposite the short arms at the other. It runs on a pivot in a bearing box at one end; the crank's axle screws into a nut at the other; unscrewed, the dasher is lifted onto its pivot end and passed out "diagonally into the square aperture in the barrel." This rung looks at the wings' geometry, then prints the dasher, bearing box and hatch, fits them to a container laid on its side, and makes butter.