Measuring and testing – Frictional resistance – coefficient or characteristics
Patent
1997-07-30
1998-08-18
Williams, Hezron E.
Measuring and testing
Frictional resistance, coefficient or characteristics
73 10, G01N 356, G01N 1902
Patent
active
057959900
ABSTRACT:
A tester of the invention has a horizontal base with a vertical column that supports vertical guides for guiding a carriage that supports a rotary drive mechanism for an upper specimen which is secured in a chuck and engages a lower specimen supported by an interchangeable bowl. The tester is also provided with a computerized measuring system for precisely measuring characteristics to be tested. The main distinguishing feature of the tester of the invention is a that a flexible coupling that may have at least one degree of freedom (preferably three) is installed in a link between a rotary motion unit and the chuck for fixing the upper specimen. In other words, the upper specimen is fixed in a self-aligning manner so that its flat working surface is always maintained in full surface-to-surface contact with the lower specimen. In addition, a provision of the flexible coupling in the link between the drive unit and the zone of friction contact makes it possible to decrease strictness in requirement of manufacturing accuracy of guides and other parts of the tester.
REFERENCES:
patent: 3372574 (1968-03-01), Armour et al.
patent: 4939922 (1990-07-01), Smalley
patent: 4958511 (1990-09-01), Marcus
patent: 4966030 (1990-10-01), Kobayashi
patent: 5315860 (1994-05-01), Dreilich
patent: 5377525 (1995-01-01), Hutchinson
patent: 5679883 (1997-10-01), Wedeven
An article "Stick-Slip and Machine Tools" by Wolf G.J. (Lubric. Eng. 1965, vol. 21, N7, p. 273).
Dorfman Vlad
Gitis Norm
Levinson Leo
Vinogradov Michael
Center for TriBology, Inc.
Larkin Daniel S.
Williams Hezron E.
Zborovsky Ilya
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