Hardness tester

A hardness tester for measuring hardness of a material by pressing an indenter attached to the lower end of a load application shaft into the test specimen. A reference cylinder is coaxially and slidably fitted around the load application shaft, and a datum plane, to be in contact with the specimen, is formed at the lower end of the reference cylinder, so as to limit the penetration depth of the indenter into the specimen to a predetermined constant depth. A stop device is provided for regulating the descending of the load application shaft relative to the reference cylinder. 

The present invention relates to a hardness tester that measures hardness of a material by pressing an indenter attached to the lower end of a load application shaft into the test specimen.

With the conventional hardness testers of this type, a predetermined test load has been applied to produce an indentation of variable dimensions in the surface of the specimen. Then, the area or the depth of the indentation was measured to determine the hardness of the material being tested. A high degree of technical skill was needed to accomplish accurate measurement of the area or depth of such indentation.

2015-08-11 16:36