Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1977-06-30
1979-08-14
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
G01B 706
Patent
active
041647076
ABSTRACT:
An improvement is provided in a device for measuring the thickness of non-magnetic layers on magnetic substrates by determining the adhesion of a magnet in contact with the layer. The device comprises a housing, a scale balance carrying the magnet at one end thereof, the scale balance being mounted rotatably on an axis, a manually rotatable disk and a first spring means connected to the scale balance at one end and to the scale disk at the other end. The scale disk and first spiral spring are coaxial with the scale balance axis. The improvement comprises drive means including a second spiral spring means which has one end attached to the casing and the other end attached to the scale disk. The second spiral spring is coaxial with the scale balance axis. The spring tension of the second spiral spring means is slightly greater than that of the first spiral spring means and counteracts the first spiral spring means. A governor means controls the rotational speed of the scale disk and a pawl means is formed on the scale balance, the pawl means engaging the drive means, thereby blocking the further rotation of the scale disk upon raising the magnet from the non-magnetic layer.
REFERENCES:
patent: 3716779 (1973-02-01), Akulov
Elektro-Physik Publication; "Surface Testing Instruments", Nix & Steingroeven K.G.; 5 Koln 60; Pasteurstr. 15, West Germany, p. 8; 1970.
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