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TECNOLOGIA VESTÍVEL
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.
Intermediário
3 hours
Instruções
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.
Materiais para este passo:
Tubo de PVC1 peça
Sortido de acessórios para tubo de PVC1 conjuntoFerramentas necessárias:
Berbequim sem fios
Jogo de brocas
Régua2
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.
Materiais para este passo:
Rolamento de esferas1 peça
Tubo de vinil transparente1 metroFerramentas necessárias:
Pistola de cola quente3
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.
Ferramentas necessárias:
Bomba de água submersível
Balde
Proveta graduada
Cronómetro4
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.
Materiais para este passo:
Farinha sem fermento50 g
Corante alimentar5 mlFerramentas necessárias:
Bandeja de cerâmica5
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.
Ferramentas necessárias:
Cronómetro
Fita de máscara6
6
Reaction speed and coverage
Reaction speed and coverage
A carregar o notebook 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.
Materiais
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- 1 metroReferência
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Ferramentas necessárias
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