UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
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).
Hagati
2 hours
Amabwiriza
1
1
Seat the strip in the casing
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.
Ibikoresho by'iyi ntambwe:
Moulded Insulating Casing1 igice
Igice cy'ubuhangarwe bwa karubone1 igiceIbikoresho bikenewe:
Ipfundo Rifite Umunwa Uringaniye2
2
Bolt the terminals
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.
Ibikoresho by'iyi ntambwe:
Igikoresho cy'uduhuza2 ibice
Contact Plate2 ibiceIbikoresho bikenewe:
Utubariro tw'umunwa muremure3
3
Fit shaft, sleeve, collar and yoke
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.
Ibikoresho by'iyi ntambwe:
Umutambiko w'ubugenzuzi1 igice
Shaft Sleeve1 igice
Shaft Collar1 igice
Shaft Yoke1 igice
Spring Washer1 igiceIbikoresho bikenewe:
Utubariro tw'umunwa muremure4
4
Fit the sprung roller
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.
Ibikoresho by'iyi ntambwe:
Roller Stem1 igice
Contact Roller1 igice
Uruziga Rurambuye1 igice
Coil Spring1 igiceIbikoresho bikenewe:
Utubariro tw'umunwa muremureIbikoresho
13- 1 igiceUmwanya
- Umwanya
- 2 ibiceUmwanya
- 2 ibiceUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
Ibikoresho bikenewe
2- Umwanya
Iki gishushanyo gikora
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CC0 Umurenge rusange
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