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Ventilating Paddle Rocking Churn: Hinged Paddles That Strike One Way and Slip the Other
George W. Cook, Schenectady, New York · Public domain (expired patent)
Woody

Dibuat oleh

Woody

6. Oktober 2026NO
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Ventilating Paddle Rocking Churn: Hinged Paddles That Strike One Way and Slip the Other

Cook set out to let "a current of fresh air" into the churn "to hasten the production of the butter and to improve its quality." George W. Cook of Schenectady, New York, received US 3,460, dated 28 February 1844, for "Cook's Ventilating Churn": a semi-cylinder balanced on pivots so it rocks easily, its top closed by thin boards except a narrow opening in the middle. Inside, two frames at about 45° from the vertical, inclined opposite ways, carry perforated paddles hung on gudgeons. As the vessel is canted, one set swings square to its frame and strikes the cream while the other turns flat against its stops. This rung works out how the paddles hang, then prints the ends, frames and paddles, bends a stainless semi-cylinder, and makes butter.
Lanjutan
About 6 hours, plus printing

Instruksi

1

How the paddles hang

Memuat notebook Jupyter…
2

A rocking churn on pivots before it

The embedded blueprint rocks a box on gudgeons with springs to return it. Cook balances his vessel on pivots and puts hinged paddles inside.
3

Read US 3,460

"When the vessel is canted, as represented in Fig. 2 the paddles N drop down or turn on their gudgeons assuming a position nearly at right angles to the sides of the frame of the paddles. At the same time the paddles N2 of the other frame turn until they are in a line parallel with the sides of the frame when they strike against pins or stops O2 inserted into the sides of the frame on the inside thereof."
4

Print the parts

Print two vessel ends flat (/uploads/blueprints/ventilating-paddle-rocking-churn-end.stl), each with its groove, pivot boss and the two ledges for the frames. Print two frames (/uploads/blueprints/ventilating-paddle-rocking-churn-frame.stl) and eight perforated paddles (/uploads/blueprints/ventilating-paddle-rocking-churn-paddle.stl). Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Material untuk langkah ini:

Filamen PETGFilamen PETG1 buah

Alat yang dibutuhkan:

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

Bend and close the vessel

Cut a 0.5 mm stainless sheet 160 mm wide and about 252 mm long, deburr it, and bend it round a 160 mm form into a half circle. Seat it in both ends' grooves in silicone. Cut two thin plywood boards to close the top, sloping 10–15° down toward the middle and leaving a narrow opening there, as his.

Material untuk langkah ini:

Lembaran baja nirkarat - 304Lembaran baja nirkarat - 3041 buah
Sealant SilikonSealant Silikon1 buah
Lembaran kayu lapisLembaran kayu lapis1 buah

Alat yang dibutuhkan:

Gunting sengGunting seng
Alat penghilang duri sisaAlat penghilang duri sisa
Palu karetPalu karet
KlemKlem
Gergaji CopingGergaji Coping
6

Hang the paddles and the vessel

Hang four paddles in each frame on M3 screws through the frame's sides, so they swing freely and lie against the stops one way. Set the two frames on the ledges inside the vessel, inclined opposite ways. Build a pine stand with two posts and hang the vessel on an M8 bolt through each end's boss, so it is nicely balanced.

Material untuk langkah ini:

Sekrup mesinSekrup mesin1 buah
Mur Segi EnamMur Segi Enam1 buah
Papan pinusPapan pinus1 buah
Sekrup kayu #8 x 1"Sekrup kayu #8 x 1"1 buah
Lem KayuLem Kayu1 buah

Alat yang dibutuhkan:

Gergaji TanganGergaji Tangan
Bor Tanpa KabelBor Tanpa Kabel
Set Mata BorSet Mata Bor
Set obengSet obeng
Kunci InggrisKunci Inggris
7

The patent drawing

US 3,460 drawing sheet, public domain (expired patent).
Langkah 7 - Image 1
8

Rock and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour 500 ml through the middle opening. Rock the vessel steadily from side to side; time until the butter comes. Lift out the frames, then 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.

Material untuk langkah ini:

Krim kentalKrim kental500 ml
Garam Laut KasarGaram Laut Kasar1 buah
AirAir1 buah

Alat yang dibutuhkan:

Termometer probe tinggal-pasangTermometer probe tinggal-pasang
StopwatchStopwatch
Timbangan Dapur DigitalTimbangan Dapur Digital
Mangkuk aduk baja nirkarat (besar)Mangkuk aduk baja nirkarat (besar)
9

Paddles that stick, a vessel that tips

Ventilating paddle rocking churn troubleshooting.

Flow

Loading...
10

History and honest limits

**George W. Cook** of Schenectady, New York, received US 3,460, dated 28 February 1844. Blocks on the vessel's convex side met a cross bar of the frame to stop it canting too far; handles in its side rocked it; iron straps strengthened it; a plugged aperture drew off the milk; a button held the two frames in place. He claimed combining with a rocking churn "floats or paddles arranged in and hinged to a frame." **Honest limits.** Stainless sheet, plywood and printed parts stand in for his wooden vessel and frames. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Bahan

12

Alat yang Diperlukan

15

Blueprint terkait

Blueprint ini berbagi pengetahuan — teknik, bahan, atau prinsip

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CC0 Domain Publik

Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.

Dukung Maker dengan membeli produk melalui Cetak Biru mereka di mana mereka mendapatkan Komisi Pembuat yang ditetapkan oleh Penjual, atau buat iterasi baru dari Cetak Biru ini dan masukkan sebagai koneksi di milik Anda sendiri.

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