US PATENT SUBCLASS 338 / 157
.~.~ Contact rolls along element or taps

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}
157.~.~ Contact rolls along element or taps {1}
158  DF  .~.~.~> Contact rolls rectilinearly

DEFINITION

Classification: 338/157

(under subclass 118) Subject matter wherein the movable contact has a rolling surface which rolls along, or over, and in direct contact with the resistance element or with the intervening structure between the element and contact, such as the element taps.

(1) Note. Subject matter generally found in this subclass includes a contact having a rolling or revolving surface that rolls along or over and remains in direct contact with the resistance element or taps as opposed to the type of contact which slides or rubs along or over the resistance element as classified in subclasses 160+ below. As between this subclass (157) and subclass 155 above, the contact must make at least a complete revolution in its adjustment over the length of the element for classification in this subclass (157). See also (1) Note under subclass 155.

SEE OR SEARCH THIS CLASS, SUBCLASS:

79+, for reel type resistors which may include a rolling contact.

143+, for mechanically variable resistors involving a contact which rolls along a helical resistance element.

155, for mechanically variable resistors whose contact rocks along the element. See also (1) Note, above. 202, for movable contact structure such as contacts, per se.

SEE OR SEARCH CLASS

191, Electricity: Transmission to Vehicles, especially

53, 56 and 63+, for trolley collectors involving rolling contractors.