Penetration hardness tester with digital readout

Details Penetration hardness tester with digital readout Penetration hardness tester with digital readout

1978-09-18

1980-01-08

Myracle, Jerry W.

Measuring and testing

Hardness

By penetrator or indentor

G01N 348

Patent

active

041821645

ABSTRACT:
A semi-automatic penetration hardness tester for measuring hardness of a test specimen in a selected one of a number of hardness number scales. A digital display indicates penetrator displacement during application of a minor load in a first mode of operation and may be monitored by an operator to achieve a penetrator displacement within a preselected range corresponding to application of a minor load of desired magnitude. A control circuit senses manual initiation of a major load application and automatically scales the minor load penetrator reference position to a reference hardness number corresponding to and correlated with the selected hardness number scale. The control circuit also senses an operator error during the test procedure and automatically aborts the test.

REFERENCES:
patent: 2554206 (1951-05-01), Pearson et al.
patent: 2858696 (1958-11-01), Underwood
patent: 3590630 (1971-07-01), Ericksson

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