US PATENT SUBCLASS 338 / 112-- .~.~.~ Contact surface area of piles variable

US PATENT SUBCLASS 338 / 112
.~.~.~ Contact surface area of piles variable

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

68	DF	MECHANICALLY VARIABLE (E.G., RHEOSTAT) {24}
99	DF	.~ Surfaces pressed together (e.g., compressible type) {2}
101	DF	.~.~ Pile type {9}
112		.~.~.~ Contact surface area of piles variable

DEFINITION

Classification: 338/112

(under subclass 101) Subject matter wherein normally only a portion of the facing surfaces of the pile discs are in actual physical contact, the discs being flexible or resilient, the means for varying the engagement pressure and when actuated increasing and/or decreasing the portion of the facing surfaces in actual physical contact.

SEE OR SEARCH THIS CLASS, SUBCLASS:

96, for a mechanically variable resistor having a contact strip progressively pressed along the resistance element.

114+, for mechanically variable resistors whose elements are deformable.