Single turn potentiometer with helical coil spring wiper

Details Single turn potentiometer with helical coil spring wiper Single turn potentiometer with helical coil spring wiper

1977-05-20

1979-06-19

Goldberg, E. A.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338202, H01C 1034

Patent

active

041588312

ABSTRACT:
A single turn potentiometer is constructed as either an open frame or a housed unit. Both units incorporate a helical coil spring wiper mounted within a rotor and supported by a hollow resilient pad. In the open-frame unit, the rotor includes a shaft which extends through a corresponding hole on a ceramic substrate. The ceramic substrate cooperates with the rotor and includes a deposited cermet resistance element and a circular collector ring. A stop arrangement is built into the rotor in the open-frame unit. The closed-frame unit includes a housing having a moulded-in stop for cooperation with a similar stop for cooperation with a similar stop on the rotor. In the open-frame unit, the shaft which protrudes through the hole in the substrate is of split configuration and is spread by an insert to hold the rotor to the substrate in riveting fashion. The closed-frame unit employs a peened-over portion of the housing which is used to constrain the assembly. Means and method for affixing the conductor leads to the substrate are disclosed.

REFERENCES:
patent: 2118112 (1938-05-01), Schellenger
patent: 2155309 (1939-04-01), Henton et al.
patent: 3296356 (1967-01-01), McAdams
patent: 3531753 (1970-09-01), Geese
patent: 3581265 (1971-05-01), Falco
patent: 3772630 (1973-11-01), Falco
patent: 3890590 (1975-06-01), Van Benthuysen et al.

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