Measuring and testing – Surface and cutting edge testing – Roughness
Patent
1975-06-06
1976-09-28
Myracle, Jerry W.
Measuring and testing
Surface and cutting edge testing
Roughness
G01N 332
Patent
active
039824276
ABSTRACT:
A means and method or process are described in which a sample of solid curable elastomeric material, such as raw or compounded vulcanizable rubber or equivalent, is worked or shear stressed between dies which hold its opposite faces firmly while one of them is gyrated or moved in a small-diameter path about the axis of the other. By this means, a continuous shear stress is applied to the sample over its entire transverse area, there being no relaxing or reversal of the applied forces as in the conventional oscillating systems. The apparatus comprises an upper die, mounted for axial movement towards or away from a lower die whose central vertical axis is slightly offset from the axis of the former. Elastic means bonding the lower die to its mount prevent its rotation but permit flexing and shifting laterally as the lower die is rotated or gyrated in a small circle about the axis of the upper die. This gyration but non-rotation of the lower die stresses the sample uniformly throughout its transverse area, permitting a greater rate of energy input into the sample than earlier systems in which the stress was predominantly in the peripheral area of the sample. Reaction to working in the sample is measured in the form of torque set up in the gyration drive motor; this is sensed and recorded by conventional strain gauge and recording means.
REFERENCES:
patent: 2595069 (1952-04-01), Fritz
patent: 2735295 (1956-02-01), Piety
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