Measuring and testing – Frictional resistance – coefficient or characteristics
Patent
1975-05-02
1977-01-04
Swisher, S. Clement
Measuring and testing
Frictional resistance, coefficient or characteristics
73160, G01N 1902
Patent
active
040006417
ABSTRACT:
A portable frictometer employing the principle of passing a standard yarn sample across a cylindrical surface under test at a fixed wrap angle and detecting the ratio of the yarn tensions at the output and input ends of the wrap. This ratio is related to the coefficient of friction of the surface under test. The apparatus includes a yarn guiding system of two guide pulleys at the extremities of two rigid arms so as to achieve a predetermined fixed yarn wrap on the cylindrical surface under test when the arms are placed to contact and straddle the surface and a tension ratio monitor consisting of a disc rotatably mounted about its center with two small concentric central yarn guide pulleys and two separated peripheral guide pulleys thereon. The disc is coupled with a readout arrangement that provides a reading of the deflection of the disc which is proportional to the ratio of tensions in two yarn sections passing respectively across the peripheral pulleys and thence each around the central pulley and on to or from yarn supply reels.
REFERENCES:
patent: 2378614 (1945-06-01), Zahn
patent: 3324719 (1967-06-01), Segrave
patent: 3556369 (1971-01-01), Ferguson
patent: 3813917 (1974-06-01), Cole
E. I. Du Pont de Nemours and Company
Shoon Frederic
Swisher S. Clement
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