Geometrical instruments – Distance measuring – Opposed contacts
Patent
1994-08-30
1997-01-28
Fulton, Christopher W.
Geometrical instruments
Distance measuring
Opposed contacts
33783, 33831, 33DIG11, G01B 318, G01B 320
Patent
active
055968139
ABSTRACT:
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.
REFERENCES:
patent: 2376118 (1945-05-01), Brown
patent: 3987552 (1976-10-01), Raiteri
patent: 4621656 (1986-09-01), Suzuki et al.
patent: 5029402 (1991-07-01), Lazecki et al.
patent: 5351125 (1994-09-01), Karanian et al.
Nagy Bela G.
Olson, Jr. Eric E.
Fulton Christopher W.
Gordon David
Saint Gobain/Norton Industrial Ceramics Corp.
Ulbrich Volker R.
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