LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Thermostatic Electric Iron
Alfred G. Swenson, Frank E. Finlayson · Public domain (expired patent)
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22. september 2026SE
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Thermostatic Electric Iron

The electric flat-iron already published has one state: on. Leave it plugged in and it keeps getting hotter until something scorches - the user is the thermostat. The rung above it puts the Butz idea, a bimetallic strip, inside the iron: the iron holds whatever temperature the dial asks for, and silk and linen each get their own. **US 2,723,336**, "Thermostatically controlled electric flatiron or the like", Swenson and Finlayson, assigned to General Electric, filed 23. July 1953, granted 8. November 1955. **You build the thermostat, not the mains appliance**: a bimetallic strip switching a battery-powered lamp, measured on a hotplate - then you measure a real iron's cycling from the outside.
Byrjandi
2 hours

Leiðbeiningar

1

A switch from a strip

Clamp one end of the bimetallic strip. Set a screw or a stiff wire as the contact so the free end presses it at room temperature. Wire strip and contact in series with the LED, its resistor and the battery holder: the lamp is on while they touch.

Efni fyrir þetta skref:

TvímálmsræmaTvímálmsræma1 stykki
5 mm LED5 mm LED1 stykki
ViðnámasettViðnámasett1 sett
Dupont-tengivírasett (karl-kvenkyns)Dupont-tengivírasett (karl-kvenkyns)1 sett

Nauðsynleg verkfæri:

AA-rafhlöðuhaldari (4 sellur)AA-rafhlöðuhaldari (4 sellur)
FjaðurklemmaFjaðurklemma
2

Heat it and watch

Tape the thermocouple to the strip. Warm it gently on the hotplate and note the temperature when the lamp goes out; let it cool and note when it lights again. Three runs.

Nauðsynleg verkfæri:

HitaplataHitaplata
Hitanemapar með aflestriHitanemapar með aflestri
Tær öryggisglerauguTær öryggisgleraugu
3

Move the contact

Turn the contact screw in by half a turn so the strip must bend further, and repeat. That screw is the iron's fabric dial.

Nauðsynleg verkfæri:

Hitanemapar með aflestriHitanemapar með aflestri
4

Measure a real iron

Stand a steam iron on its heel on a heatproof surface at a mid setting. With the infrared thermometer on the soleplate and a stopwatch, time how long its indicator lamp stays on and off over several cycles, and note the highest and lowest readings.

Nauðsynleg verkfæri:

GufustraujárnGufustraujárn
Innrauður hitamælirInnrauður hitamælir
SkeiðklukkaSkeiðklukka
5

Bend, hysteresis, duty cycle

Hleð Jupyter-vinnubók…
6

History & Context

**What the patent specifies:** a flatiron whose heating element is switched by a thermostat set from a fabric dial, holding the soleplate at the chosen temperature. **Modern build (derived):** the bimetal switch alone, on safe low voltage, plus outside measurements of a working iron. The same bimetal switch went into kettles, ovens, toasters and motor overload protectors. Its limits: the strip switches over a few degrees of swing, it ages with cycling, and it senses its own temperature - not the cloth's.
Skref 6 - Image 1

Efni

4

Nauðsynleg verkfæri

8

Tengd Blueprint

Þessi blueprint deila þekkingu — tækni, efni eða meginreglur

Electric Flat-Iron

Electric Flat-Iron

eftir VoltSE

Rafeindatækni

29
0
0
0
0
0
Butz Thermostat

Butz Thermostat

eftir EdFI

Rafeindatækni

44
0
0
0
0
0

CC0 opinbert ríki

Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.

Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.

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