(under subclass 68) Subject matter wherein (1) two or more separate and distinct masses, including grains, of resistance material or (2) a distinct and separate mass of resistance material and a mass of conductive material are in exterior surface engagement with one another, together with means for varying the surface engagement pressure to vary the contact resistance between the engaging surfaces.
(1) Note. The masses may be layers of solids, or granular, or fibrous such as steel wool, or coated materials. The conducting mass may be a terminal.
(2) Note. In this subclass the resistance value is varied by the change in contact pressure between the two masses. While in subclasses 2+ and 114+ the cross section area or length of the element itself may be changed by compression to vary the resistance value.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1, for coherer type resistors.
47+, for force actuated resistors. 51+, for resistors with heat dissipating projections, such as vanes.
70+, for a lamp socket having a compressible type resistor therein or thereon.
93, for a compressible spring type variable resistor whose element is adjustably short-circuited.
114+, for a mechanically variable resistor whose element is deformable to vary the resistance value. See also (2) Note above.
204+, for fixed resistance elements formed of layers piled or stacked between terminals.
SEE OR SEARCH CLASS
323, Electricity: Power Supply or Regulation Systems,
295, for regulation systems including a pressure variable resistor.
