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Spray-Jet Dishwasher Arm
Robert L. Tatham · Public domain (expired patent)
Martin

Dicipta oleh

Martin

22. September 2026NO
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Spray-Jet Dishwasher Arm

Josephine Cochrane's machine, already published, held the dishes in wire racks and threw water at them from fixed jets while the rack was turned. Robert Tatham's rung makes the water do the moving: jets angled off the radius push the arm round, so a pump and one moving part wash a stationary load from every direction. **US 1,900,529**, "Dishwasher", Robert L. Tatham, filed 29. June 1929, granted 7. March 1933: apparatus for "washing dishes by discharging water with considerable force, in the form of jets or sprays", delivered by a pump. Every domestic dishwasher since has a reaction-driven spray arm. **You build the arm** from PVC pipe on a bearing, fed by a submersible pump, and measure its speed and how much of a dirty plate it actually cleans.
Pertengahan
3 hours

Arahan

1

Drill the arm

Cap both ends of a 200 mm length of 20 mm PVC pipe. Drill six 2 mm holes along it, three each side of centre, all angled about 20 degrees off straight-out and all the same way round.

Bahan untuk langkah ini:

Paip PVCPaip PVC1 keping
Set Penyambung Paip PVCSet Penyambung Paip PVC1 set

Alatan diperlukan:

Gerudi Tanpa WayarGerudi Tanpa Wayar
Set Mata GerudiSet Mata Gerudi
PembarisPembaris
2

Hang it on a bearing

Fit a ball bearing at the arm's centre on a short stub of pipe so it spins freely, and connect the pump to the stub with vinyl tubing. Keep the tubing slack so it cannot drag.

Bahan untuk langkah ini:

Galas BebolaGalas Bebola1 keping
Tiub vinil jernihTiub vinil jernih1 meter

Alatan diperlukan:

Penembak gam panasPenembak gam panas
3

Measure the flow

Run the pump into a graduated cylinder for 15 seconds and work out litres per minute. Do it again with the pump half-throttled by pinching the tube.

Alatan diperlukan:

Pam air rendamPam air rendam
BaldiBaldi
Silinder penyukatSilinder penyukat
Jam RandikJam Randik
4

Dirty a plate

Paint a ceramic plate with a paste of flour and food colouring and let it dry hard. Stand it in the bucket above the arm.

Bahan untuk langkah ini:

Tepung biasaTepung biasa50 g
Pewarna makananPewarna makanan5 ml

Alatan diperlukan:

Dulang seramikDulang seramik
5

Run, count, compare

Run for one minute, counting arm revolutions in 30 seconds. Photograph the plate and estimate the share cleaned. Repeat with the arm locked still, and at half flow.

Alatan diperlukan:

Jam RandikJam Randik
Pita pelekat kertasPita pelekat kertas
6

Reaction speed and coverage

Memuatkan buku nota Jupyter…
7

History & Context

**What the patent specifies:** washing by forceful jets or sprays delivered by a pump against dishes held in a tray. **Modern build (derived):** a reaction-driven PVC arm and an aquarium pump. Later machines added a second arm above, a heater to keep the wash hot, and a detergent dispenser timed to the cycle. Its limits: a jet cannot clean what it cannot reach, so loading matters; burnt-on food still needs soaking; and the arm stalls if cutlery drops through the rack.
Langkah 7 - Image 1

Bahan

6

Alatan Diperlukan

10

Blueprint berkaitan

Blueprint ini berkongsi pengetahuan — teknik, bahan atau prinsip

Dishwasher

Dishwasher

oleh MaryFI

Pembinaan

45
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CC0 Domain Awam

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