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US 6,142,010 AGranted
Penetration hardness tester
AssigneeInstron Corporation
InventorsJohn J. Merck, Jr., Jon Wyman, Richard Conti
Life of this patent
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Abstract
A hardness tester is disclosed which conducts its hardness test through a penetrator impinging upon the surface of a test specimen. Enhanced accuracy and repeatability is achieved through the use of a closed loop system and directly mounting a load cell to the indentor, connecting a linear displacement transducer directly to the load cell and eliminating an elevating screw in initially positioning and applying load to the specimen to be tested.
Claims20
A hardness tester for performing materials hardness testing on a test specimen, said hardness tester comprising:
- indentor means for creates a deformation in the specimen;
- motor means for generating motive power;
- actuator means for transmitting said motive power into vertical movement;
- load cell means for generating a load directly coupled to said indentor means;
- linear displacement transducer means for sensing the amount of vertical movement of said actuator means and said indentor means;
- closed loop control means for applying load to the test specimen and for controlling indentor means movement;
- and
- user interface means for displaying test parameters and test results and for providing electrical signals to direct a test operation run by said hardness tester,
- wherein said linear displacement transducer means and said closed loop control means in combination control non-load vertical movement of said indentor means resulting from an electrical feedback signal from said linear displacement transducer means which is indicative of the amount of vertical movement of said indentor means,
- and wherein said load cell and said closed loop control system means in combination control movement of said indentor means resulting from an electrical feedback signal from said load cell means which is also indicative of the amount of load applied to said load cell means and said indentor means.
7 more elements
Dependencies are inferred from the claim text.