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Valved Hollow-Staff Plunger Churn: A Valve at the Top, Air Forced Out at the Foot
Ellicott's dasher draws its air down through its own handle.
Peter F. Ellicott of Philadelphia, Pennsylvania, received US 7,454, dated 25 June 1850, for an atmospheric churn: "in any ordinary vertical churn," an upright hollow staff connected at the bottom to a square or round hollow plunger open below, with air holes in its sides "1/2 inch in diameter," and a valve inside the staff at its top "so arranged that when the said staff and plunger are raised, the valve will open," and when forced down "the valve will close, and the atmospheric air in the plunger will be forced through the body of the milk or cream."
This rung works out the air per stroke, then prints the plunger and valve cap, fits them to a hollow staff, and makes butter.
Beginner
About 1 hour, plus printing
Instructions
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Air per stroke
Air per stroke
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A hand dasher that pumps air before it
A hand dasher that pumps air before it
The embedded blueprint pumps air with a tube over a loose plunger. Ellicott's air comes down a hollow staff through a valve at its top.
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Read US 7,454
Read US 7,454
"C, Fig. 1 is a square or round dasher or plunger being hollow and open at the lower end with air holes, in the sides, 1/2 inch in diameter, and knobs outside. D, Fig. 2 is a full size section of valve placed on the top of the staff B, Fig. 1."
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Print the parts
Print the parts
Print the hollow plunger open end down (/uploads/blueprints/valved-hollow-staff-plunger-churn-plunger.stl), with its twelve side holes and a socket for the staff, and the valve cap (/uploads/blueprints/valved-hollow-staff-plunger-churn-valve-cap.stl). Print in PLA at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.
Materials for this step:
PLA Filament1 pieceTools needed:
FDM 3D Printer5
5
Staff and valve
Staff and valve
Cut a length of 12–13 mm food-grade tube as the hollow staff, as long as the churn is deep plus 150 mm, and glue it into the plunger's socket. Glue a small leather flap inside the valve cap over its port, hinged on the cap's pin, so it lifts to let air in as the staff rises and seats as it falls; glue the cap on the staff's top.
Materials for this step:
PVC Pipe1 piece
Leather Strip1 piece
Two-Part Epoxy1 pieceTools needed:
Hacksaw
Sandpaper6
6
The churn
The churn
Drill a food-grade bucket's lid at the centre for the staff, a little larger than it.
Materials for this step:
20-Liter Bucket1 pieceTools needed:
Cordless Drill
Hole Saw Kit7
7
The build in 3D
The build in 3D
FreeCAD model of this build, not of the patent: the churn cut away to show the hollow plunger with its side holes, the hollow staff through the lid and the valve cap on top.
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Dash and make butter
Dash and make butter
Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 2 litres. Work the staff up and down; bubbles should burst from the plunger's holes on each down-stroke. Time until the butter comes. Pour off the buttermilk, add cold water, churn a little and pour off again until it runs clear; work in a pinch of salt and weigh the butter.
Materials for this step:
Heavy Cream2000 ml
Coarse Sea Salt1 piece
Water1 pieceTools needed:
Leave-In Probe Thermometer
Stopwatch
Digital Kitchen Scale
Stainless Steel Mixing Bowl (Large)9
9
No bubbles, cream up the staff
No bubbles, cream up the staff
Valved hollow-staff plunger churn troubleshooting.
Flow
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History and honest limits
History and honest limits
**Peter F. Ellicott** of Philadelphia, Pennsylvania, received US 7,454, dated 25 June 1850. His drawing shows the plunger with knobs outside and a full-size section of the valve. He claimed "a hollow staff connected with a square or round hollow plunger, with a valve placed at the top, or at any point inside of said staff," to be used in any vessel containing milk or cream.
**Honest limits.** Food-grade tube and printed parts stand in for his staff, plunger and valve; our holes are smaller than his half inch. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.
Materials
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Tools Required
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Design Files
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CC0 Public Domain
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