Measuring and testing – Frictional resistance – coefficient or characteristics
Patent
1975-06-09
1976-08-31
Queisser, Richard C.
Measuring and testing
Frictional resistance, coefficient or characteristics
G01N 1902
Patent
active
039772314
ABSTRACT:
The static coefficient of friction between contacting surfaces of a plurality of bodies is determined by applying a load to the bodies in a direction normal to the contacting surfaces. Opposite ends of a flexible filament are fixedly connected to a load cell and a first of the bodies. A motor continuously moves a second of the bodies away from the load cell at constant velocity to pull the first body at right angles to the force of the normal load so that the first body moves intermittently relative to the second body across a contact surface between them. The load on the surfaces, the nature of the surfaces, and the speed of the first body relative to the load cell are such that the filament is alternately and cyclically tensioned and relaxed as the movement occurs. The maximum tension occurs at the incipient stages of movement of the first body relative to the second body. The load cell derives a series of measurements which are coupled to an x-y recorder, from which the maximum forces of the filament are determined to enable the static coefficient of friction to be determined. From the maximum forces and the normal force, the coefficient is determined. For determining coefficients of friction where there are large compression loads, the normal load is applied with a calibrated compression spring that is deflected by a predetermined amount determined by a spring load vs. deflection calibration curve.
REFERENCES:
patent: 1668593 (1928-05-01), Jones
patent: 2493782 (1950-01-01), Schwarz
patent: 3059464 (1962-10-01), Deane
patent: 3245253 (1966-04-01), Gruber
patent: 3721115 (1973-03-01), Kearns
patent: 3785196 (1974-01-01), Smith
Haehner Carl L.
Tarpley John L.
Manning John R.
Marchant Robert D.
Queisser Richard C.
The United States of America as represented by the Administrator
Tresansky John O.
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