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

Dibuat 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.
Menengah
3 hours

Instruksi

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.

Material untuk langkah ini:

Pipa PVCPipa PVC1 buah
Aneka Sambungan Pipa PVCAneka Sambungan Pipa PVC1 set

Alat yang dibutuhkan:

Bor Tanpa KabelBor Tanpa Kabel
Set Mata BorSet Mata Bor
PenggarisPenggaris
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.

Material untuk langkah ini:

Bantalan PeluruBantalan Peluru1 buah
Selang vinil beningSelang vinil bening1 meter

Alat yang dibutuhkan:

Pistol lem panasPistol lem 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.

Alat yang dibutuhkan:

Pompa air celupPompa air celup
EmberEmber
Gelas ukurGelas ukur
StopwatchStopwatch
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.

Material untuk langkah ini:

Tepung terigu serbagunaTepung terigu serbaguna50 g
Pewarna makananPewarna makanan5 ml

Alat yang dibutuhkan:

Nampan keramikNampan keramik
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.

Alat yang dibutuhkan:

StopwatchStopwatch
Selotip kertasSelotip kertas
6

Reaction speed and coverage

Memuat notebook 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

Alat yang Diperlukan

10
  • 1
    Bor Tanpa Kabel
    1 vendor sell this, none ship to you yet
    Placeholder
  • 1
    Set Mata Bor
    Placeholder
  • 1
    Penggaris
    Placeholder
  • 2
    Pistol lem panas
    Placeholder
  • 3
    Pompa air celup
    Placeholder
  • 3
    Ember
    Placeholder
  • 3
    Gelas ukur
    Placeholder
  • 35
    Stopwatch
    Placeholder
  • 4
    Nampan keramik
    Placeholder
  • 5
    Selotip kertas
    Placeholder

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Blueprint ini berbagi pengetahuan — teknik, bahan, atau prinsip

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Konstruksi

44
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CC0 Domain Publik

Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.

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