KUNST
SCHÖNHEIT & WELLNESS
HANDWERK
KULTUR & GESCHICHTE
UNTERHALTUNG
UMFELD
ESSEN & GETRÄNKE
REVERSE ENGINEERING
WISSENSCHAFTEN
SPORT
TECHNOLOGIE
WEARABLES
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.
Fortgeschritten
3 hours
Anweisungen
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.
Materialien für diesen Schritt:
PVC-Rohr1 Stück
PVC-Fittingsortiment1 SetBenötigte Werkzeuge:
Akkubohrschrauber
Bohrersatz
Lineal2
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.
Materialien für diesen Schritt:
Kugellager1 Stück
Klarer Vinylschlauch1 MeterBenötigte Werkzeuge:
Heißklebepistole3
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.
Benötigte Werkzeuge:
Tauchpumpe
Eimer
Messzylinder
Stoppuhr4
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.
Materialien für diesen Schritt:
Weizenmehl50 g
Lebensmittelfarbe5 mlBenötigte Werkzeuge:
Keramikschale5
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.
Benötigte Werkzeuge:
Stoppuhr
Malerkrepp6
6
Reaction speed and coverage
Reaction speed and coverage
Jupyter-Notebook wird geladen …
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.
Materialien
6- 1 StückPlatzhalter
- 1 SetPlatzhalter
- Platzhalter
- 1 MeterPlatzhalter
- 50 gPlatzhalter
- Platzhalter
Benötigte Werkzeuge
10- 1 vendor sell this, none ship to you yetPlatzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
- Platzhalter
Verwandte Blueprints
Diese Blueprints teilen Wissen — Techniken, Materialien oder Prinzipien
CC0 Gemeinfrei
Dieser Blueprint ist unter CC0 veröffentlicht. Sie dürfen dieses Werk für jeden Zweck frei kopieren, ändern, verbreiten und verwenden, ohne um Erlaubnis zu fragen.
Unterstützen Sie den Maker, indem Sie Produkte über seinen Blueprint kaufen, wo er eine Maker-Provision von Anbietern festgelegt, verdient. Oder erstellen Sie eine neue Iteration dieses Blueprints und verbinden Sie ihn in Ihrem eigenen Blueprint, um Einnahmen zu teilen.