Material hardness testing apparatus

Details Material hardness testing apparatus Material hardness testing apparatus

1984-05-10

1985-08-20

Swisher, S. Clement

Measuring and testing

Hardness

By penetrator or indentor

73 83, G01M 342

Patent

active

045356238

ABSTRACT:
The surface hardness of material is tested by the extent of penetration of a tool thereinto by moving the tool onto the surface from a low to a high value of compressive force and then back to the low value by reversible rotative movements with the penetration being determined from the difference between the two rotative movements, in which the movement may be related to incremental rotative steps with the difference in the number of steps determining the extent of penetration and in which the movement may be automatically performed. The improvements comprise differential thread means comprising a rotatable part and means for revolving the rotatable part to effect linear movement of the penetrating end, and flexure means allowing free axial motion but preventing rotation of the rod (21) therebetween.

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