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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.
Ophakathi
3 hours
Imiyalelo
1
1
Drill the arm
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.
Izinto zokwakha zalesi sinyathelo:
Ipayipi Le-PVC1 ucezu
Iqoqo Lezixhumanisi Zepayipi Le-PVC1 isethiAmathuluzi adingekayo:
Ibhola Elingenantambo
Iqoqo Lamakhanda Ebhola
Irula2
2
Hang it on a bearing
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.
Izinto zokwakha zalesi sinyathelo:
I-Bearing Yamabhola1 ucezu
Ishubhu le-vinyl eliqhakazile1 imithaAmathuluzi adingekayo:
Isibhamu sikaglu oshisayo3
3
Measure the flow
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.
Amathuluzi adingekayo:
Iphampu yamanzi engena emanzini
Ibhakede
Isilinda esinezilinganiso
Iwashi Lokumisa Isikhathi4
4
Dirty a plate
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.
Izinto zokwakha zalesi sinyathelo:
Ufulawa ovamile50 g
Umbala wokudla5 mlAmathuluzi adingekayo:
Ithreyi lobumba5
5
Run, count, compare
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.
Amathuluzi adingekayo:
Iwashi Lokumisa Isikhathi
Itheyiphu lokumboza6
6
Reaction speed and coverage
Reaction speed and coverage
Ilayisha incwadi ye-Jupyter…
7
7
History & Context
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.
Izinto
6- 1 ucezuIsibambeli
- Isibambeli
- Isibambeli
- 1 imithaIsibambeli
- 50 gIsibambeli
- 5 mlIsibambeli
Amathuluzi Adingekayo
10- 1 vendor sell this, none ship to you yetIsibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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