The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 2017
Filed:
Mar. 26, 2014
Chicago Dial Indicator Company, Des Plaines, IL (US);
Larry K Baxter, Gloucester, MA (US);
Gerardus C. M. Meijer, Delft, NL;
Chicago Dial Indicator Company, Des Plaines, IL (US);
Abstract
A dial indicator for accurately measuring displacement of a part along a measurement axis. The dial indicator includes scale electrodes of a given pitch and reader stationary scale electrodes of a given pitch. A reader carries a plurality of reader bars having a pitch of one half that of the scale electrodes. A set of drive signals of a given frequency are applied in different ways to the scale bar electrodes to achieve coarse and fine positions of the reader relative to the scale. One operating mode involves determining the position of the readerwith a coarse measurement relative to the scale, and a fine measurement. These signals can combined to obtain an accurate position over the reader and position of a spindle reading displaced.