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Potentiometer: Podolsky Roller-Contact Unit in a Moulded Casing

Leon Podolsky · Public domain (expired patent)

작성자

21. 10월 2026

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).

중급

2 hours

안내

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.

이 단계의 재료:

Moulded Insulating Casing1 개

카본 저항체1 개

필요한 도구:

평집게

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.

이 단계의 재료:

단자 볼트2 개

Contact Plate2 개

필요한 도구:

롱노즈 플라이어

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.

이 단계의 재료:

제어 샤프트1 개

Shaft Sleeve1 개

Shaft Collar1 개

Shaft Yoke1 개

Spring Washer1 개

필요한 도구:

롱노즈 플라이어

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.

이 단계의 재료: