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US Patent: 5,596,813
Measuring instrument with diamond coated contacts
Eric E. Olson - Bolton, MA
Bela G. Nagy - Acton, MA

USPTO Classifications:
33/783, 33/816, 33/831, 33/DIG.11

Tool Categories:
layout tools : measurement gauges

Saint Gobain/Norton Industrial Ceramics Corp - Worcester, MA

Not known to have been produced

none listed

Patent Dates:
Applied: Aug. 30, 1994
Granted: Jan. 28, 1997

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Norton Co.
Volker R. Ulbrich & David Gordon - patent attorneys


Precision measuring instruments having highly parallel and wear-resistant contact members and a method for fabricating these contact areas are disclosed. The measuring instruments preferably include two contact members each having diamond coated ceramic substrates. The method for diamond coating the contact members of the measuring instruments includes, for each contact member, preparing a ceramic substrate to high tolerance so that it has two surfaces which are parallel within 0.25 microns, diamond coating one surface of the substrate by any one of several chemical vapor deposition (CVD) techniques, and metalizing the other surface of the substrate for affixing it to the contact member of the measuring instrument. The metalized surface of the substrate is preferably affixed to the contact members of the measuring instrument by brazing, gluing or welding. Preferred embodiments of the measuring instruments with diamond coated contact areas include calipers and micrometers. The provided measuring instruments can be used to measure extremely abrasive materials such as sandpaper and grinding wheels without suffering any appreciable wear to their contact surfaces over a long period of time

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