Reference-load variable hardness tester

Details Reference-load variable hardness tester Reference-load variable hardness tester

1977-05-11

1979-01-30

Ciarlante, Anthony V.

Measuring and testing

Hardness

By penetrator or indentor

G01N 344

Patent

active

041365550

ABSTRACT:
A reference-load variable hardness tester for measuring Rockwell hardness and Rockwell superficial hardness, having an internal coil spring and an external coil spring disposed coaxially with a load shaft for each reference-load. When measuring Rockwell hardness, both the internal coil spring and the external coil spring work for the reference-load, and when measuring Rockwell superficial hardness, only the internal coil spring works for the reference-load.

REFERENCES:
patent: 2667065 (1954-01-01), Ernst
patent: 3416367 (1968-12-01), Ernst
patent: 3939700 (1976-02-01), Anderson
patent: 4023401 (1977-05-01), Ernst

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