Centrifugal and Centripetal Churn Dasher: Paired Blades That Squeeze the Cream Through

Robbins wrote that in all other churns butter gathers round the dasher and clogs it, so churning stops "before the cream has parted with all the butter it contains." Z. C. Robbins of St. Louis, Missouri, received US 7,006, dated 8 January 1850, for what he called the "Centrifugal and Centripetal Churn-Dasher": broad outer blades on the ends of the arms with their inner faces at right angles to the radii, and inner blades whose outer edges lie on the circle of motion a short distance behind the outer blades' after edges, passing obliquely forward under them. Turned, the cream is forced between each pair; reversed, the inner blades gather the butter "into a roll in the center of the dasher." It followed his telegraph churn of June 1849. This rung works out the squeeze, then prints the dasher in one piece, fits it in a box, and makes butter.