Self-Closing Float Dasher Churn: Floats That Open to Churn and Close to Gather

Davis wanted one dasher that would churn "in the most effectual manner," then gather the butter and work out the buttermilk. Robert W. Davis of Rodgersville, New York, received US 7,233, dated 2 April 1850, for self-adjusting rotary churn-dashers. The dasher's fixed slats are set "at such angles as to force the cream toward the center"; movable floats hinged to its sides stand open when turning that way and move it outward, "which various and contrary motions so agitate it, that the butter is soon formed." Turned backward, the floats close on the slats so the outside forms "a uniform curve concentric to the axis," which throws the butter to the sides and bottom and presses it free of milk. This rung looks at the floats' swing, then prints the sides, slats and floats, assembles the dasher in a box, and makes butter.