Measuring and testing – Frictional resistance – coefficient or characteristics – Lubricant testing
Reexamination Certificate
2005-02-22
2005-02-22
Cygan, Michael (Department: 2855)
Measuring and testing
Frictional resistance, coefficient or characteristics
Lubricant testing
C073S009000, C073S053050
Reexamination Certificate
active
06857306
ABSTRACT:
A four-ball test apparatus for evaluation of friction and wear characteristics of lubricants is disclosed. The test apparatus includes a motor and adjustable weight assembly that is supported by the upper test ball on the lower test balls positioned in a test cup. All of the weight of the motor/weight assembly is supported by the test ball itself, and thrust bearings or the like are not required for support of the test cup. The four-ball test apparatus eliminates numerous sources of error found in prior four-ball testers, and permits various instruments or fluid lines to be connected to the test cup without introducing errors into the test measurements.
REFERENCES:
patent: 2019948 (1935-11-01), Boerlage
patent: 2370606 (1945-02-01), Morgan
patent: 3302447 (1967-02-01), Abraham et al.
patent: 3939690 (1976-02-01), Kuss et al.
patent: 4228674 (1980-10-01), Mertwoy
patent: 20030101793 (2003-06-01), Evans
patent: 2183347 (1987-06-01), None
patent: 2075055 (1997-03-01), None
“Four-Ball Top For Testing The Boundary Lubricating Properties Of Oils Under High Mean Pressures”, G.D. Boerlage and H. Blok, Engineering, vol. CXLIV, pp. 1-2, Jul. 2, 1937.
Cygan Michael
Price Heneveld Cooper DeWitt & Litton LLP
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