Measuring and testing – Hardness – By penetrator or indentor
Patent
1988-05-11
1990-02-13
Raevis, Robert R.
Measuring and testing
Hardness
By penetrator or indentor
B21D 2214
Patent
active
048995770
ABSTRACT:
A bar device has one end portion supporting a test body and is pivotable about a pivot center. The bar device comprises a measuring device together with a probe, which works on the basis of measuring the thickness of thin layers. An energizing means acts on the bar device and comprises a first part rigid with a housing and a second part rigid with the bar device. A geometric first longitudinal axis passes through the center of the probe and the center of the test body. The part rigid with the housing comprises a cylindrical electromagnetic coil having a geometric second longitudinal axis parallel with the first longitudinal axis. The coil has a clear space parallel with the second longitudinal axis. Substantially coaxial with the second longitudinal axis, a carrier rod is rigid in its longitudinal direction relative to the end portion of the bar device and is connected in entraining fashion to the bar device. The carrier rod carries an upper magnet carrier above the coil and a lower magnet carrier below the coil. Fixed to the magnet carriers are rigid permanent magnets of which one pole points axially in the same direction. The travel of the carrier rod amounts to a few millimeters.
REFERENCES:
patent: 3202886 (1965-08-01), Kramer
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patent: 4542311 (1985-09-01), Newman et al.
patent: 4611487 (1986-09-01), Krenn et al.
patent: 4671104 (1987-06-01), Fischer
patent: 4691559 (1987-09-01), Fischer
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