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Valved Hollow-Staff Plunger Churn: A Valve at the Top, Air Forced Out at the Foot
TheChef

Erstellt von

TheChef

6. Oktober 2026DK
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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.
Anfänger
About 1 hour, plus printing

Anweisungen

1

Air per stroke

Jupyter-Notebook wird geladen …
2

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.
3

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."
4

Print the parts

Print the hollow plunger open end down, with its twelve side holes and a socket for the staff, and the valve cap. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Materialien für diesen Schritt:

PETG-FilamentPETG-Filament1 Stück

Benötigte Werkzeuge:

FDM-3D-DruckerFDM-3D-Drucker
5

Print the plunger

The plunger, printed as step 4 describes.
DesigndateiSTLCC0 - Free
6

Print the valve cap

The valve cap, printed as step 4 describes.
DesigndateiSTLCC0 - Free
7

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.

Materialien für diesen Schritt:

PVC-RohrPVC-Rohr1 Stück
LederstreifenLederstreifen1 Stück
ZweikomponentenepoxidZweikomponentenepoxid1 Stück

Benötigte Werkzeuge:

Bügelsäge (Metallsäge)Bügelsäge (Metallsäge)
SchleifpapierSchleifpapier
8

The churn

Drill a food-grade bucket's lid at the centre for the staff, a little larger than it.

Materialien für diesen Schritt:

20-Liter-Eimer20-Liter-Eimer1 Stück

Benötigte Werkzeuge:

AkkubohrschrauberAkkubohrschrauber
Lochsägen-SetLochsägen-Set
9

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.
DesigndateiBLENDCC0 - Free
10

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.
Schritt 10 - Image 1

Materialien für diesen Schritt:

SchlagsahneSchlagsahne2000 ml
Grobes MeersalzGrobes Meersalz1 Stück
WasserWasser1 Stück

Benötigte Werkzeuge:

Einsteck-FühlerthermometerEinsteck-Fühlerthermometer
StoppuhrStoppuhr
Digitale KüchenwaageDigitale Küchenwaage
Große Rührschüssel aus EdelstahlGroße Rührschüssel aus Edelstahl
11

No bubbles, cream up the staff

Valved hollow-staff plunger churn troubleshooting.

Flow

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12

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.

Materialien

8

Benötigte Werkzeuge

9

Designdateien

3

Dieser Bauplan stellt her

CC0 Gemeinfrei

Dieser Blueprint ist unter CC0 veröffentlicht. Sie dürfen dieses Werk für jeden Zweck frei kopieren, ändern, verbreiten und verwenden, ohne um Erlaubnis zu fragen.

Unterstützen Sie den Maker, indem Sie Produkte über seinen Blueprint kaufen, wo er eine Maker-Provision von Anbietern festgelegt, verdient. Oder erstellen Sie eine neue Iteration dieses Blueprints und verbinden Sie ihn in Ihrem eigenen Blueprint, um Einnahmen zu teilen.

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