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Double-Swing Churn: Swing the Platform, the Toothed Pieces Work Both Dashers

Daniel Osgood, Jr., Bluehill, Maine · Public domain (expired patent)

أنشأه

Woody

6. أكتوبر 2026

Double-Swing Churn: Swing the Platform, the Toothed Pieces Work Both Dashers

Working a dash churn means lifting the dasher, again and again. Daniel Osgood, Jr., of Bluehill, Maine, received US 831, dated 9 July 1838, for what he called "Osgood's Double-Swing Churn": two common churns on a platform swinging in a frame. The side pieces rising from the platform are cut into teeth that mesh with the teeth of two pieces hung above, so as the platform swings backward and forward a lever is alternately raised and depressed, "giving the downward and upward motion to the dashers." The power required, he wrote, "is nearly in proportion to the power required to draw a pendulum in its lateral motion compared with that of raising its weight." This rung compares the swing of his platform and ours, then prints the toothed sectors, builds a tabletop frame for two jars, and makes butter.

متوسط

About 6 hours, plus printing

التعليمات

Swing period and dasher stroke

جارٍ تحميل دفتر Jupyter…

One load balancing another on a lever

The embedded blueprint lifts water with a counterweighted beam. Osgood's beam balances one churn's dasher against the other's, and he says to balance a single churn with a weight.

Read US 831

"This saving of labor is acquired by placing two common churns, Figure 3 (a a) on a swinging platform (b). This platform is made to swing by being suspended in the frame A, B, C, D, by a rod passing through the frame and two pieces (d d) rising from the sides of the platform (b)... The ends of the side pieces (d, d,) and the corresponding upper, pieces (g, g,) are cut into teeth or cogs (l l,) and mesh into each other."

Print four toothed sectors

Print four identical sectors (/uploads/blueprints/double-swing-churn-sector.stl), flat. Each has a 6.6 mm pivot hole at the centre of its teeth and two screw holes in its tail. 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)

Build the frame and platform

Make two A-frames of pine about 420 mm tall, joined at the top by a cross bar. Drill both for two 6 mm steel rods 60 mm apart, one above the other: the lower rod carries the platform and the upper carries the beam. Cut a plywood platform 280 × 130 mm. Screw an upright pine strip to each side of the platform, reaching up to the lower rod, and screw a sector to the top of each strip, teeth up and pivot on the rod.

المواد لهذه الخطوة:

لوح صنوبر1 قطعة

لوح خشب رقائقي1 قطعة

قضيب فولاذ طري1 قطعة

برغي خشب #8 × 1 بوصة1 قطعة

غراء خشب1 قطعة

الأدوات المطلوبة:

منشار يدوي

منشار حديد

مثقاب لاسلكي

طقم لقم ثقب

ملازم

شريط قياس

Hang the beam and dashers

Screw the other two sectors to two short pine pieces hung on the upper rod, teeth down, meshing with the lower ones. Join the hung pieces with a cross bar and fix a beam across it at right angles, 200 mm long. Hang a dowel dasher with a plywood disc from each end on a loose screw, through a hole in each jar's lid. Fit a long handle to the platform.

المواد لهذه الخطوة:

لوح صنوبر1 قطعة

أوتاد من خشب صلب1 قطعة

لوح خشب رقائقي1 قطعة

مرطبان زجاجي2 قطع

برغي خشب #8 × 1 بوصة1 قطعة

الأدوات المطلوبة:

منشار يدوي

مثقاب لاسلكي

طقم لقم ثقب

طقم مفكات

The patent drawing

US 831 drawing sheet, public domain (expired patent).

Swing and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour half into each jar, no more than a third full, and fit the lids. Swing the platform steadily by the handle; the dashers rise and fall in turn. 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.

المواد لهذه الخطوة:

قشدة كاملة الدسم500 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

Teeth that slip, a swing that dies

Double-swing churn troubleshooting.

Flow

History and honest limits

**Daniel Osgood, Jr.** of Bluehill, Hancock County, Maine, received US 831, dated 9 July 1838. He gave the dimensions for common use: a frame 3 ft 1 in high, churns 1 ft 7 in high, 14 inches across at the bottom and 12 at the top, a platform 2 ft 6 in by 1 ft, and the pendulum 1 ft 4 in from its rod to the platform. "When but one churn is necessary, the other may be dispensed with by substituting any other weight in its stead to balance the one that is used." He claimed "the manner in which the dashers are worked by the pendulous motion of the churn." **Honest limits.** Jars on a tabletop frame stand in for his two churns, and printed sectors for his wooden teeth. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.