Method and apparatus for quantitatively evaluating roll hardness
Patent 5079728 Issued on January 7, 1992. Estimated Expiration Date: 
January 31, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 31, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2737048 2834202 3425263 3425267 3540270 3822588 3879982 Method of an apparatus for testing the hardness of materials Strike diagnosis apparatus Testing of structures by impact InventorsAssigneeApplicationNo. 472780 filed on 01/31/1990US Classes:702/42, Stress or strain measurement73/79, Scleroscope or rebound73/82Impact typeExaminersPrimary: Black, Thomas G.Assistant: Ramirez, Ellis B. Attorney, Agent or FirmForeign Patent References
International ClassG01N 003/30AbstractA method and apparatus for testing the hardness of wound rolls, such as paper rolls, which yields quantitative information which is reproducible from roll to roll and under various conditions of testing. The apparatus can be operated much like a backtender's stick, to simply strike the roll at a point where hardness is to be determined with a force variable between certain limits as determined by the operator using the stick. The apparatus includes an accelerometer mounted in a striker associated with circuitry for producing signals relating to (a) the energy of the impact between the striker and roll and (b) the peak deceleration of the striker. Those signals are processed to produce a roll hardness measure, which can be correlated to a commonly used Rho scale if desired, and which is repeatable irrespective of the force used by the operator to cause the impact.Other References
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