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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

Imeundwa na

Woody

6. Oktoba 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.
Juu
About 6 hours, plus printing

Maagizo

1

How the paddles hang

Inapakia daftari la 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, each with its groove, pivot boss and the two ledges for the frames. Print two frames and eight perforated paddles. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Vifaa kwa hatua hii:

Uzi wa PETGUzi wa PETG1 kipande

Zana zinazohitajika:

Printa ya 3D ya nyuzi (FDM)Printa ya 3D ya nyuzi (FDM)
5

Print the end

The end, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
6

Print the frame

The frame, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
7

Print the paddle

The paddle, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
8

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.

Vifaa kwa hatua hii:

Bati la chuma cha pua - 304Bati la chuma cha pua - 3041 kipande
Kizibo cha SilikoniKizibo cha Silikoni1 kipande
Bati la mbao za kubandikaBati la mbao za kubandika1 kipande

Zana zinazohitajika:

Mkasi wa batiMkasi wa bati
Kifaa cha kuondoa ukingoKifaa cha kuondoa ukingo
Nyundo ya mpiraNyundo ya mpira
VibanoVibano
Msumeno wa kukata mikunjoMsumeno wa kukata mikunjo
9

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.

Vifaa kwa hatua hii:

Skrubu za mashineSkrubu za mashine1 kipande
Nati ya pembe sitaNati ya pembe sita1 kipande
Ubao wa msonobariUbao wa msonobari1 kipande
Skrubu ya mti #8 x inchi 1Skrubu ya mti #8 x inchi 11 kipande
Gundi ya MbaoGundi ya Mbao1 kipande

Zana zinazohitajika:

Msumeno wa mkonoMsumeno wa mkono
Kekee cha BetriKekee cha Betri
Seti ya vichimbuziSeti ya vichimbuzi
Seti ya bisibisiSeti ya bisibisi
Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
10

The patent drawing

US 3,460 drawing sheet, public domain (expired patent).
Hatua 10 - Image 1
11

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.

Vifaa kwa hatua hii:

Malai nzitoMalai nzito500 ml
Chumvi ya Bahari MbichiChumvi ya Bahari Mbichi1 kipande
MajiMaji1 kipande

Zana zinazohitajika:

Kipima joto chenye kijiti kinachobaki ndaniKipima joto chenye kijiti kinachobaki ndani
Saa ya kupima mudaSaa ya kupima muda
Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
Bakuli kubwa la kuchanganyia la chuma cha puaBakuli kubwa la kuchanganyia la chuma cha pua
12

Paddles that stick, a vessel that tips

Ventilating paddle rocking churn troubleshooting.

Flow

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13

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.

Vifaa

12

Zana Zinazohitajika

15

Faili za muundo

3

Mchoro huu unatengeneza

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Spring-Return Rocking Churn: Springs Under Each End Lift the Low One Back

Spring-Return Rocking Churn: Springs Under Each End Lift the Low One Back

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Rocking-Stool Churn: Rock the Churn, the Dashers Ride With It

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Water-Jacketed Churn: Hot or Cold Water Under a Metal Plate Tempers the Cream

Water-Jacketed Churn: Hot or Cold Water Under a Metal Plate Tempers the Cream

na KarenSE

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