Measuring and testing – Ductility or brittleness
Patent
1975-08-25
1977-05-03
Ruehl, Charles A.
Measuring and testing
Ductility or brittleness
33DIG1, 33147D, G01B 530
Patent
active
040206815
ABSTRACT:
A portable strain gauge for measuring stress in a bar. The instrument includes a pair of spaced magnetic bases that magnetically adhere to the bar. A pair of mounting pads may be firmly strapped to the bar at suitable spacing in order to mount the bases in situations where the bar is nonmagnetic. An actuator rod has one end fixed to the first base and its other end freely slides in an axial direction relative to the second base. A pivotal lever is spring biased against the actuator rod to pivot in proportion to movement of the rod relative to the second base as the bar is stressed. A dial indicator includes a plunger that is spring biased against the lever at a location offset from the actuator rod. The lever displaces the plunger in proportion to the movement of the actuator rod in order to mechanically convert the strain on the bar into stress which is indicated on the dial indicator.
REFERENCES:
patent: 2099662 (1937-11-01), Slonneger
patent: 2316975 (1943-04-01), Ruge
patent: 2622440 (1952-12-01), Friedman
patent: 2900613 (1959-08-01), Dahl
patent: 3082621 (1963-03-01), Soderholm
patent: 3089066 (1963-05-01), Vc et al.
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