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Piston-Float Air Churn: Hollow Floats With Pistons Worked by a Fixed Eccentric
D. N. Egbert, Hudson, Ohio · Public domain (expired patent)
Emma

Imeundwa na

Emma

6. Oktoba 2026SE
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Piston-Float Air Churn: Hollow Floats With Pistons Worked by a Fixed Eccentric

Egbert wanted the air "forcibly discharged in small jets at the very point where it is most required, viz, the moving surface of the dasher." D. N. Egbert of Hudson, Ohio, received US 6,727, dated 18 September 1849, for a rotary churn-dasher in a case with a zinc bottom: two sets of arms joined by hollow floats whose sides are pierced with small holes, each fitted with a piston. Connecting rods join the pistons to an eccentric ring running on an eccentric fixed to the end piece, so each float fills with air as it ascends and discharges it as it descends. A strap from a large pulley on the crank shaft to a small one on the dasher's shaft turns it fast. This rung works out the air each float pumps, then prints the floats, pistons, eccentric and arms, builds them over a stainless bottom, and makes butter.
Juu
About 6 hours, plus printing

Maagizo

1

Air per float

Inapakia daftari la Jupyter…
2

A dasher that is also an air pump before it

The embedded blueprint pumps air with a tube over a loose plunger. Egbert builds the pump into each float of a rotary dasher.
3

Read US 6,727

"It will now be perceived that as the floats ascend above their horizontal position by the revolution of the dasher, each piston is in turn withdrawn in its appropriate float and the hollow cavity filled with air; as the floats descend below their horizontal position this air is forcibly discharged through the perforations of the floats, below the surface of the liquid."
4

Print the parts

Print two hollow floats and two pistons, the fixed eccentric and its ring, two arm sets and the crank arm. 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 hollow float

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

Print the piston

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

Print the eccentric

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

Print the eccentric's ring

The eccentric's ring, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
9

Print the arm sets

The arm sets, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
10

Print the crank arm

The crank arm, printed as step 4 describes.
Faili ya UsanifuSTLCC0 - Free
Pakua modeli
11

The case

Make two plywood end pieces with a 90 mm radius half circle grooved in each, and bend a 0.5 mm stainless sheet into the bottom, seated in the grooves with silicone, as his zinc bottom. Screw the eccentric to the inside of one end on the axis, offset upward as printed.

Vifaa kwa hatua hii:

Bati la mbao za kubandikaBati la mbao za kubandika1 kipande
Bati la chuma cha pua - 304Bati la chuma cha pua - 3041 kipande
Kizibo cha SilikoniKizibo cha Silikoni1 kipande
Skrubu ya mti #8 x inchi 1Skrubu ya mti #8 x inchi 11 kipande

Zana zinazohitajika:

Msumeno wa kukata mikunjoMsumeno wa kukata mikunjo
Mkasi wa batiMkasi wa bati
Kifaa cha kuondoa ukingoKifaa cha kuondoa ukingo
Nyundo ya mpiraNyundo ya mpira
Seti ya bisibisiSeti ya bisibisi
12

Dasher, pistons and rods

Slide the two arm sets onto a 10 mm square hardwood shaft and screw a float to the ends of each pair of arms, holes outward. Fit a piston in each float. Fit the ring over the eccentric and join each piston to the ring with two thin pine rods on M3 screws, so the ring is carried round by the arms. Pass the shaft through the other end and glue the crank arm and handle on.

Vifaa kwa hatua hii:

Vijiti vya mbao ngumuVijiti vya mbao ngumu1 kipande
Ubao wa msonobariUbao wa msonobari1 kipande
Skrubu za mashineSkrubu za mashine1 kipande
Nati ya pembe sitaNati ya pembe sita1 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
13

The patent drawing

US 6,727 drawing sheet, public domain (expired patent).
Hatua 13 - Image 1
14

Crank and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres. Crank steadily and watch for jets of bubbles as each float goes down; 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.

Vifaa kwa hatua hii:

Malai nzitoMalai nzito1500 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
15

Pistons that stick, no jets

Piston-float air churn troubleshooting.

Flow

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16

History and honest limits

**D. N. Egbert** of Hudson, Summit County, Ohio, received US 6,727, dated 18 September 1849. A tightening pulley on a spring lever kept the strap taut. He claimed the combination of the pistons moved by stationary eccentrics with the floats of a revolving dasher. **Honest limits.** Our crank turns the shaft directly, without his strap and pulleys; stainless sheet and printed parts stand in for his zinc and wooden floats. The notebook gives an upper bound. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Vifaa

13

Zana Zinazohitajika

13

Faili za muundo

6

Mchoro huu unatengeneza

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

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