Oscillating-Pump Churn: A Half-Round Vane Pump Lifts the Cream Over and Strains It Back Through a Partition

W. H. McClintock of Frankfort, Ohio, received US 24,223, dated 31 May 1859, for a churn that is a pump. A box is divided by a perforated partition into a cream chamber and a butter chamber. In the cream chamber a half-round pump has a vane swung back and forth by a lever: each stroke sucks cream up through a passage round the pump and flap valves into one side, and forces the other side's cream up through valves on top into a channel that runs into the butter chamber. The cream strains back through the partition and goes round again, chafed at every pass, until the butter is left in the butter chamber. Pumping water round the same way rinses the churn and washes the butter. This rung builds it in a pine box with a printed pump.