Measuring and testing – Frictional resistance – coefficient or characteristics
Patent
1978-02-03
1978-12-19
Swisher, S. Clement
Measuring and testing
Frictional resistance, coefficient or characteristics
73146, G01N 1902
Patent
active
041300084
ABSTRACT:
A device for measuring the coefficient of friction between a test material and a surface comprises a frame upon which is slidably mounted a test pad holder. The test pad holder has a pad of test material mounted on it so that the test material is in contact with the surface whose coefficient of friction is to be measured when the test pad holder is mounted on the frame. A fillable container fits into the test pad holder, which container is filled with particulate material to thereby provide a force on the test pad in a direction normal to the surface whose coefficient of friction is to be measured. The test pad holder abuts an actuator shaft connected to a piston, which piston abuts a flexible diaphragm that forms one wall of a fluid filled chamber. When the frame is pulled, the test pad holder slides relative to the frame and pushes against the actuator shaft. The actuator shaft in turn urges the piston against the flexible diaphragm, resulting in an increase in pressure within the fluid filled chamber. The increase in pressure is indicated by a pressure gauge fluidly connected to the chamber. As the pulling force applied to the frame is increased, the test pad and holder begin to move relative to the surface. The force required to start the test pad and holder moving relative to the surface, and the force necessary to keep the test pad and holder in motion, as indicated by the pressure gauge, are used to determine the coefficient of friction between the test pad and the surface. The test and holder with test pad attached is easily removable and replaceable and a plurality of holders, each with a test pad of a specific test material, are made available for use. In combination with the above-described apparatus, there is mounted on the frame a device to determine and indicate the distance which the frame travels over the surface whose coefficient of friction is being tested.
REFERENCES:
patent: 2225140 (1940-12-01), Walker
patent: 2496405 (1950-02-01), Foufounis
patent: 3195342 (1965-07-01), Bartelink
patent: 3301039 (1967-01-01), Kummer
patent: 3367170 (1968-02-01), Lynch
patent: 3538742 (1970-11-01), Benning
Corr Denis E.
Swisher S. Clement
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