Trimming potentiometers with coarse and fine adjustment means

Electrical resistors – Mechanically variable – Movable contact electrically adjustable over length of...

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Details

74 1054, 74 108, H01C 1032

Patent

active

040443272

ABSTRACT:
A trimming potentiometer having a resistive member and a rotatable member attached to a wiper in contact with the resistive member for varying the position of the wiper thereon, wherein the rotatable member has a peripherally toothed portion and the non-rotatable part of the potentiometer is formed with a plurality of structures defining pivot points for a rotatable adjusting tool, each of the pivot points being spaced from the peripherally toothed portion of the rotatable member by less than the radius of this portion, whereby a toothed adjusting tool can be engaged with any one of the structures and with the toothed portion of the rotatable member for adjustment of the rotatable member by rotation of the tool, the structures being positioned to define different adjustment directions for the tool.

REFERENCES:
patent: 1450566 (1923-04-01), Smith
patent: 1501454 (1924-07-01), Hunt
patent: 1575153 (1926-03-01), Dobbins
patent: 1805154 (1931-05-01), Webster
patent: 3187287 (1965-06-01), Weidenman
patent: 3235827 (1966-02-01), Baker
patent: 3360757 (1967-12-01), Wahlberg
patent: 3576512 (1971-04-01), Michik

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