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US 5,212,452 AGranted
Rotatable capacitance sensor
AssigneeModern Controls, Inc.
InventorsDaniel W. Mayer, Roger C. Oestreich
Life of this patent
Estimating the term…
Abstract
A rotatable capacitance sensor preferably constructed of a generally cylindrical body mounted on bearings to a carriage assembly. The body has a number of parallel, spaced apart conductive plates having edges extending through the exterior body surface, and alternate ones of the plates are connected via a bearing to a conductor in one part of the carriage assembly, and the remaining ones of the plates are connected via a bearing to a second conductor in another part of the carriage assembly.
Claims6
A rotatable sensor adapted for positioning against a moving film material, comprising:
- a) a generally cylindrical body aligned along a first axis;
- b) a pair of bearing assemblies in said body, said assemblies positioned at respective opposite ends of said body along said first axis;
- c) a plurality of spaced apart conductive plates in said body between said bearing assemblies, alternate ones of said plates being commonly connected to a first conductor and the remainder of said plates being commonly connected to a second conductor;
- edges of said conductive plates extending to the exterior surface of said body;
- d) a dielectric insulator material interleaved between said spaced apart conductive plates, thereby forming a predetermined capacitance between alternate ones of said plates;
- e) means for connecting said first conductor to one of said bearing assemblies and means for connecting said second conductor to the other of said bearing assemblies;
- f) carriage means adjacent respective ends of said body, for attaching to said bearing assemblies;
- whereby to provide freely rotatable movement of said body about said first axis;
- and
- g) means connected to said bearing assemblies for applying an electrical signal thereto and for measuring changes in said signal caused by capacitance changes between said plates.
7 more elements
Dependencies are inferred from the claim text.