Measuring and testing – Hardness – By penetrator or indentor
Patent
1981-12-28
1984-03-13
Goldberg, Gerald
Measuring and testing
Hardness
By penetrator or indentor
73 85, G01N 344
Patent
active
044359764
ABSTRACT:
Apparatus for measuring the hardness properties of materials may comprise: a frame for supporting the apparatus and the material to be tested; a test head assembly mounted on the frame for applying predetermined measuring forces to the material and a clamp assembly mounted on the frame for supporting the material and for applying a clamping force to clamp the material against the tester head assembly prior to application of the predetermined measuring forces. The tester head assembly may include a housing; a penetrator assembly carried by the housing, including an axially reciprocal penetrator shaft at the lower end of which is a ball member for contact with the material; an operating assembly for applying a first predetermined force and a second and greater predetermined force to the penetrator shaft for indentation of the material by the ball member, and indicating devices for measuring the difference of indentations of the material by the first and second predetermined forces. A load cell may be attached to the penetrator shaft for measuring the first and second predetermined forces, for controlling the operating assembly by which the first and second predetermined forces are applied to the penetrator shaft, and for reporting load to the control panel.
REFERENCES:
patent: 2790321 (1957-04-01), Huyser
patent: 3877298 (1975-04-01), Narang
patent: 3934463 (1976-01-01), Venderjagt
patent: 4245496 (1981-01-01), Napetschnig
patent: 4312220 (1982-01-01), Borgersen et al.
patent: 4331026 (1982-05-01), Howard et al.
Berryhill Bill B.
Chapman, Jr. John E.
Goldberg Gerald
J B Development Corporation
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