Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1981-03-25
1983-09-06
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
G01B 706, G01R 3312
Patent
active
044031882
ABSTRACT:
A layer-thickness meter for measuring the thickness of a non-magnetic layer upon a ferromagnetic substrate wherein the force required to raise from the layer to be measured a permanent magnet carried in a balanced lever arm is measured by means of a spring and taken as a measure of the layer thickness, the spring being stressed by rotation of a scale disc graduated in terms of layer thickness and co-operating with an index mark upon a housing of the meter, the circumferential edge of said disc being serrated or indented for engagement by a pawl so as to lock the disc in response to detachment of the permanent magnet from the layer surface, said pawl comprising a pivotally mounted bearing plate from which project two rigid stops which between them loosely embrace said lever arm at a location along said arm such that the pawl is actuated through one said stop to disengage from the disc edge when said permanent magnet is in contact with said layer surface and actuated through the other said stop to engage and lock the disc immediately the magnet becomes detached from said surface.
REFERENCES:
patent: 3521160 (1970-07-01), Nix et al.
patent: 4152846 (1978-11-01), Steinbgroever et al.
patent: 4164707 (1979-08-01), Nix
Edmonds Warren S.
Elektro-Physik Hans Nix & Dr. Ing. E. Steingroever, K.G.
Strecker Gerard R.
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