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Self-Folding Blade Dasher Churn: Six Blades to Churn, Reverse and They Fold to Two That Gather

Robert W. Davis, Rodgersville, New York · Public domain (expired patent)

أنشأه

Woody

6. أكتوبر 2026

Self-Folding Blade Dasher Churn: Six Blades to Churn, Reverse and They Fold to Two That Gather

Robert W. Davis let the cream set the dasher and the butter fold it. Robert W. Davis of Rodgersville, Steuben County, New York, received US 10,566, dated 28 February 1854, for "Churns for Making and Working Butter": a dasher of two end pieces B carrying blades a, and divided end pieces C hung loosely on pins "set eccentric to the axis of the dasher," carrying blades b and scroll-curved blades c. Turned one way, the cream's resistance opens it "so as to present six centripetal cutting or agitating blades"; reversed after the butter comes, the butter's resistance closes it "so as to present but two centrifugal gathering blades," which gather the butter, work it into rolls and expel the buttermilk. This rung works out the strokes and the turning moment, then prints the end pieces, sections and blades, builds the round-bottomed churn, and makes and works butter.

متقدم

About 5 hours, plus printing

التعليمات

Six blades or two

جارٍ تحميل دفتر Jupyter…

A dasher that changes when reversed, before it

The embedded blueprint's floats fall back onto rollers when the crank is reversed. Davis's sections fold six blades into two S-shaped gatherers.

Read US 10,566

"The blades, c, c, have a greater curvature given them in line of a scroll, than those, b, b, as seen in the drawing. This increased curvature commences from the termination of the curve of the blades, b, b, as seen in the drawing. This increased curvature prevents the dasher throwing the butter toward the center of the churn, while gathering and working it."

Print the parts

Print two end pieces B (/uploads/blueprints/self-folding-blade-dasher-churn-end-piece.stl), four sections C (/uploads/blueprints/self-folding-blade-dasher-churn-section.stl), four outer blades for a and b (/uploads/blueprints/self-folding-blade-dasher-churn-outer-blade.stl) and two scroll blades c (/uploads/blueprints/self-folding-blade-dasher-churn-scroll-blade.stl). Print the blades on their lug ends. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

المواد لهذه الخطوة:

خيط PETG1 قطعة

الأدوات المطلوبة:

طابعة ثلاثية الأبعاد بالخيط (FDM)

The round-bottomed churn

Lay a round food-grade container about 180 mm across and 180 mm long on its side in a pine cradle and cut a lid opening in its top. Drill both ends on the axis for a 10 mm square hardwood shaft and fit a crank arm and dowel handle outside.

المواد لهذه الخطوة:

حافظة خزن بدرجة غذائية1 قطعة

لوح صنوبر1 قطعة

أوتاد من خشب صلب1 قطعة

برغي خشب #8 × 1 بوصة1 قطعة

غراء خشب1 قطعة

الأدوات المطلوبة:

منشار تخريم

مثقاب لاسلكي

طقم لقم ثقب

منشار يدوي

Assemble the folding dasher

Slide the two end pieces onto the shaft inside the churn and screw an outer blade a across each pair of ends. On each side, hang a section on each end piece's pin hole with a 4 mm stainless pin, then screw an outer blade b across the sections' outer ends and a scroll blade c across their inner ends. Fit a short pin in each end piece as a stop so the sections open about square to B and fold back flat against it.

المواد لهذه الخطوة:

قضيب فولاذ طري1 قطعة

براغي آلية1 قطعة

الأدوات المطلوبة:

منشار حديد

طقم مفكات

مثقاب لاسلكي

The build in 3D

FreeCAD model of this build, not of the patent: the round-bottomed churn cut open, the end pieces with blades a on the square shaft, and the sections swung open across them on their pins, as for churning.

ملف التصميمBLENDCC0 - Free

تنزيل النموذج

Churn one way, gather the other

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres. Turn the crank the way that opens the sections and time until the butter comes. Draw off the buttermilk, then reverse the crank so the sections fold and the two S-blades gather and roll the butter. 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.

المواد لهذه الخطوة:

قشدة كاملة الدسم1500 مل

ملح بحري خشن1 قطعة

ماء1 قطعة

الأدوات المطلوبة:

مقياس حرارة بمجس يبقى داخل الطعام

ساعة إيقاف

ميزان مطبخ رقمي

وعاء خلط كبير من فولاذ مقاوم للصدأ

Sections that will not swing

Self-folding blade dasher troubleshooting.

Flow

History and honest limits

**Robert W. Davis** of Rodgersville, Steuben County, New York, received US 10,566, dated 28 February 1854. He divided the end pieces C diagonally "in the line of a cima reversa" so the blades' edges always meet them as they open and close; his Fig. 2 showed the open position in red lines, which do not survive in the black-and-white scan. He claimed dividing the end pieces C, eccentric to the dasher's axis, combined with the blades a, b, c, so the dasher adjusts itself by the resistance of the cream and then, reversed, of the butter. **Honest limits.** A container, printed parts and stop pins stand in for his churn and diagonal joints; he gave no sizes, and our blade curves are read from his figures. The notebook's force is illustrative. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.