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Potentiometer: Podolsky Roller-Contact Unit in a Moulded Casing
Leon Podolsky · Public domain (expired patent)
Ed

Creato da

Ed

21. ottobre 2026FI
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Potentiometer: Podolsky Roller-Contact Unit in a Moulded Casing

Podolsky's variable resistor (Wirt Company, US 2,060,114, 1936). The carbon strip is bent into a ring inside a moulded casing, and instead of a sliding wiper a small roller runs round it. A coil spring presses the roller out against the strip with even pressure in every position, even over slight irregularities. The patent gives no sizes; the parts are named by what they do. The picture: the patent's drawing (Figs. 8 and 9).
Intermedio
2 hours

Istruzioni

1

Seat the strip in the casing

Bend the resistance strip into a ring against the round inner wall of the moulded casing. A small rib across the wall stops both ends of the strip so it cannot shift; the thick part at the rib has a hole for bolting the casing to a panel. Ours: flat-nose pliers to ease the strip in.

Materiali per questo passaggio:

Moulded Insulating CasingMoulded Insulating Casing1 pezzo
Elemento resistivo in carbonioElemento resistivo in carbonio1 pezzo

Strumenti necessari:

Pinze a becchi piattiPinze a becchi piatti
2

Bolt the terminals

Put two terminal bolts through the casing wall, one at each end of the strip. Under each bolt head a small contact plate rests on the coated end of the strip.

Materiali per questo passaggio:

Bullone terminaleBullone terminale2 pezzi
Contact PlateContact Plate2 pezzi

Strumenti necessari:

Pinza a becchi lunghiPinza a becchi lunghi
3

Fit shaft, sleeve, collar and yoke

The shaft turns in a sleeve fixed in the base of the casing. A collar on the shaft rests on the outer end of the sleeve; on the inner end the shaft carries a yoke, with a spring washer between yoke and sleeve so the shaft cannot slide. Ours: pliers to seat the spring washer.

Materiali per questo passaggio:

Albero di comandoAlbero di comando1 pezzo
Shaft SleeveShaft Sleeve1 pezzo
Shaft CollarShaft Collar1 pezzo
Shaft YokeShaft Yoke1 pezzo
Spring WasherSpring Washer1 pezzo

Strumenti necessari:

Pinza a becchi lunghiPinza a becchi lunghi
4

Fit the sprung roller

The yoke's slotted ends guide a flat stem. The roller sits in the stem's forked outer end. A washer on shoulders of the stem, pushed out by a coil spring, holds the roller on the strip with even pressure all the way round.

Materiali per questo passaggio:

Roller StemRoller Stem1 pezzo
Contact RollerContact Roller1 pezzo
Rondella pianaRondella piana1 pezzo
Coil SpringCoil Spring1 pezzo

Strumenti necessari:

Pinza a becchi lunghiPinza a becchi lunghi

Materiali

13

Strumenti richiesti

2

Questo progetto realizza

Thumbnail
Segnaposto

Potenziometro

Free

148
0
1

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