US PATENT SUBCLASS 338 / 122
.~.~ Coarse and fine resistance elements

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

68  DF  MECHANICALLY VARIABLE (E.G., RHEOSTAT) {24}
118  DF  .~ Movable contact electrically adjustable over length of resistance element {21}
122.~.~ Coarse and fine resistance elements {1}
123  DF  .~.~.~> Plural elements and plural contacts {1}

DEFINITION

Classification: 338/122

(under subclass 118) Subject matter including two electrically connected resistance elements or a single element having relatively small and large resistance values per unit length along the element or elements, so that greater adjustment of a contact over one of the elements or portions thereof will be necessary to effect a given change in resistance value across the resistor terminals.

(1) Note. Vernier actuating structure for the movable contact is not classified here, but in subclasses 181 and 202 below.

(2) Note. The contact may move over one or both resistance elements.

SEE OR SEARCH THIS CLASS, SUBCLASS:

131, for ganged mechanically adjustable resistors with resistance elements individually adjustable.

181, for a variable resistor with a contact rectilinearly slidable, the contact being operated by a screw as a fine adjustment. See also (1) Note above.

202, for movable contact structure for variable resistors, the structure including a vernier mechanism. See also (1) Note above. SEE OR SEARCH CLASS

74, Machine Element or Mechanism,

10+, for radio tuner type shaft operators.