Hardness tester

Details Hardness tester Hardness tester

1975-09-04

1977-04-26

Gill, James J.

Measuring and testing

Hardness

By penetrator or indentor

G01N 348

Patent

active

040193764

ABSTRACT:
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. A load detector for hardness measurement is interposed on the load application shaft, to measure the hardness of the specimen by measuring the force applied to produce an indentation of a predetermined size on it.

REFERENCES:
patent: 1661718 (1928-03-01), Davis
patent: 2520387 (1950-08-01), Dobry et al.
patent: 2536632 (1951-01-01), Ernst
patent: 3077771 (1963-02-01), Ernst
patent: 3934463 (1976-01-01), Venderjagt

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