Measuring and testing – Hardness – By penetrator or indentor
Patent
1979-08-03
1981-01-27
Goldberg, Gerald
Measuring and testing
Hardness
By penetrator or indentor
73821, G01N 348
Patent
active
042467772
ABSTRACT:
A machine for testing a container such as a paper or plastic cup. The cup rests upon a platform and its stiffness is measured by applying a given load to the side of the cup by means of a motor driven load applying arm. The applied load and the resulting deflection are determined by the direct coupling together of the cores of a force cell and a linear variable displacement transformer. The load applying arm and the coil of the linear variable displacement transformer are coupled together to compensate for an initial preload condition. The ultimate load for the predetermined deflection is monitored by a force cell and the electrical signal thus generated is converted to a direct reading digitally displaced valve.
A method for testing a cup-like container by supporting the container on a set of rollers and applying a first small force normal to the side of the container. A second greater force is applied to the side of the container until a preselected overall deflection of the container side is attained. The force existing after the container has deflected the preselected amount is converted to an electrical signal which is displayed as grams on a digital meter.
REFERENCES:
patent: 2685197 (1954-08-01), Mennesson
patent: 3438250 (1969-04-01), Boutron
patent: 3464260 (1969-09-01), Heyman
patent: 3470737 (1969-10-01), Fridley
patent: 4061020 (1977-12-01), Fridley et al.
patent: 4159640 (1979-07-01), Leveque et al.
Birner Richard A.
Einfalt Arthur C.
Birchall David R.
Click Myron E.
Goldberg Gerald
Owens--Illinois, Inc.
Roskos Joseph W.
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