Geometrical instruments – Distance measuring – Opposed contacts
Patent
1989-07-24
1990-12-18
Haroian, Harry N.
Geometrical instruments
Distance measuring
Opposed contacts
33833, 335016, 33533, G01B 702
Patent
active
049776851
ABSTRACT:
A thickness gauge particularly adapted to measuring flatness of conductive sheets such as a steel workpiece. The tester includes a pair of opposed members translatable toward each other for supporting first and second planar electrical contacts. One of the contacts is disposed to support the workpiece to be gauged, and an electrical circuit is connected to the pair of contacts, to be completed when the contacts are both in contact with the workpiece. Means are provided for maintaining the parallelism of the contacts while relatively displacing them toward each other. Upon completion of the circuit, means are provided for determining the gap between the contacts which is a measure of the thickness and out-of-flatness of the sheet across the measured plane. Means are provided for setting a pass/fail limit for flatness, said limit preferably being set as an allowable gap between the electrodes before the circuit is completed such that if the allowable gap is attained before the circuit is completed, the sheet is determined to be within standards.
REFERENCES:
patent: 2217509 (1940-10-01), Bryant
patent: 4014424 (1977-03-01), Hall
patent: 4064534 (1977-12-01), Chen et al.
patent: 4538913 (1985-09-01), Anthon
patent: 4539754 (1985-09-01), Antony et al.
patent: 4602359 (1986-07-01), Palmer
patent: 4689892 (1987-09-01), Kirven
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