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Interraking Plunger Churn: Two Rakes Worked Oppositely by a Double Crank
Jason B. Schermerhorn, Deerfield, New York · Public domain (expired patent)
Martin

Dicipta oleh

Martin

6. Oktober 2026NO
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Interraking Plunger Churn: Two Rakes Worked Oppositely by a Double Crank

Schermerhorn did not claim churning with plungers, "either by hand, or by crank motion"; he claimed two of them shaped like rakes. Jason B. Schermerhorn of Deerfield, New York, received US 3,616, dated 5 June 1844, for a dairy churn with "two rake-formed plungers with teeth interraking, and with oppositely reciprocating motions communicated to them by a cranked shaft." Standards on two sides of a square box carry the crank shaft; the teeth of one plunger pass between those of the other, "the one ascending while the other is descending," which "will produce a violent commotion in the cream." This rung checks his proportions, then prints the rake heads, crank discs and yokes, builds the standards on a box, and makes butter.
Pertengahan
About 5 hours, plus printing

Arahan

1

His proportions

Memuatkan buku nota Jupyter…
2

A double crank before it

The embedded blueprint uses a double crank to pull two pitmen. Schermerhorn's double crank works two plungers up and down oppositely.
3

Read US 3,616

"The teeth of the plunger pass through the head piece horizontally, and at right angles therewith, projecting on both sides of the head-piece, but unequally; the projection on the side next the center of the churn being twice or thrice as great as on the other side. The length of the pieces forming the teeth should be equal to about two thirds of the width of the box."
4

Print the parts

Print two identical rake heads (/uploads/blueprints/interraking-plunger-churn-rake-head.stl): their teeth are set off-centre, so one turned round passes between the other's. Print two crank discs (/uploads/blueprints/interraking-plunger-churn-crank-disc.stl) and two yokes (/uploads/blueprints/interraking-plunger-churn-yoke.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Bahan untuk langkah ini:

Filamen PETGFilamen PETG1 keping

Alatan diperlukan:

Pencetak 3D filamen (FDM)Pencetak 3D filamen (FDM)
5

Box and standards

Take a food-safe box about 150 mm square and 200 mm deep. Screw a pine standard to each of two opposite sides, rising about 200 mm above the top, and drill both for a 10 mm square hardwood crank shaft. Cut two oblong openings in the lid for the plunger rods.

Bahan untuk langkah ini:

Bekas simpanan gred makananBekas simpanan gred makanan1 keping
Papan painPapan pain1 keping
Skru kayu #8 x 1"Skru kayu #8 x 1"1 keping

Alatan diperlukan:

Gergaji TanganGergaji Tangan
Gerudi Tanpa WayarGerudi Tanpa Wayar
Set Mata GerudiSet Mata Gerudi
Gergaji LengkungGergaji Lengkung
Set pemutar skruSet pemutar skru
6

Crank and plungers

Slide the crank discs onto the shaft with their pins on opposite sides, half a turn apart, and glue them 60 mm apart. Glue a rake head on each of two 12 mm dowel rods, long sides of the teeth toward the centre, and a yoke on each rod's top. Pass the rods through the lid, hang the yokes on the crank pins, and glue the crank arm and a dowel handle on the shaft's end.

Bahan untuk langkah ini:

Pasak kayu kerasPasak kayu keras1 keping
Gam KayuGam Kayu1 keping

Alatan diperlukan:

Gergaji TanganGergaji Tangan
Kertas PasirKertas Pasir
7

The build in 3D

FreeCAD model of this build, not of the patent: the box cut away to show the two rake heads with their teeth interleaving, one at the bottom and one rising, their rods up to the two crank discs on the shaft between the standards, and the crank.
Fail Reka BentukBLENDCC0 - Free
Muat turun model
8

Crank and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1 litre, fit the lid, and crank steadily; 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.
Langkah 8 - Image 1

Bahan untuk langkah ini:

Krim pekatKrim pekat1000 ml
Garam Laut KasarGaram Laut Kasar1 keping
AirAir1 keping

Alatan diperlukan:

Termometer prob kekalTermometer prob kekal
Jam RandikJam Randik
Penimbang Dapur DigitalPenimbang Dapur Digital
Mangkuk adun keluli tahan karat (besar)Mangkuk adun keluli tahan karat (besar)
9

Teeth that clash, rods that bind

Interraking plunger churn troubleshooting.

Flow

Loading...
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History and honest limits

**Jason B. Schermerhorn** of Deerfield, Oneida County, New York, received US 3,616, dated 5 June 1844. His crank was a round iron rod "from one half to five-eighths of an inch in diameter" bent into a double crank "somewhat like a fulling mill crank"; the handles were forked over the cranks and pinned, so the plungers could be withdrawn; the tooth pieces might be one inch wide by half an inch. **Honest limits.** Printed crank discs on a wooden shaft stand in for his bent iron crank, and a food-safe box for his wooden one. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Bahan

9

Alatan Diperlukan

11

Fail reka bentuk

1

Blueprint ini membuat

Thumbnail
Pemegang tempat

Tong pengocak mentega

Free

19
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Blueprint berkaitan

Blueprint ini berkongsi pengetahuan — teknik, bahan atau prinsip

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CC0 Domain Awam

Blueprint ini dikeluarkan di bawah CC0. Anda bebas menyalin, mengubah, mengedar, dan menggunakan karya ini untuk sebarang tujuan, tanpa meminta kebenaran.

Sokong Pembuat dengan membeli produk melalui Blueprint mereka di mana mereka memperoleh Komisen Pembuat ditetapkan oleh Penjual, atau cipta iterasi baru Blueprint ini dan sertakan ia sebagai sambungan dalam Blueprint anda sendiri untuk berkongsi hasil.

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