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US 4,152,687 AGranted
Conductive plastic multi-turn potentiometer
AssigneeLitton Systems, Inc.
InventorEdwin Drewitz
Life of this patent
Estimating the term…
Abstract
A resistance element comprises an insulating cylinder having a helical thread groove on the outer surface thereof. A resistive channel is supported by the groove and a multi-strand wiper is guided by a follower which rides in the root of the channel. The resistance material on the sides of the groove may be notched for purposes of calibration.
Claims5
A multi-turn potentiometer comprising:
- a core of insulating material having a cylindrical surface,
- a helical groove formed on the cylindrical surface,
- a channel of plastic resistive material supported within the helical groove, said channel having a flat root portion and flat sidewall portions,
- a follower in contact with the channel sidewalls,
- means attached to the follower for maintaining the follower in the channel as the channel is moved relative thereto,
- a wiper fixed to the follower and in riding contact with the root portion of the channel,
- at least one notch formed in the sidewall portion of the channel,
- spaced terminations mounted in said core and contacting said resistive material,
- a plurality of termination leads connected to said terminations, and
- a wiper lead coupled to said wiper.
7 more elements
A multi-turn potentiometer comprising:
- a base of insulating material having a cylindrical surface,
- a helical groove having a root portion and a sidewall portion on the cylindrical surface,
- a resistive channel having a root portion and a sidewall portion supported in the helical groove,
- a wiper in contact with the resistive channel,
- a support means attached to the wiper for positioning the wiper within the resistive channel,
- a follower attached to the support means, said wiper being mounted on the follower, a portion of the follower being in contact with the root portion of the resistive channel, and
- a plurality of conductive strands comprising the wiper.
4 more elements
Dependencies are inferred from the claim text.