Magnetic thickness gauge

摘要

An apparatus for gauging the thickness of coatings on metal products, whose casing accommodates: a wheel system; a spring actuator having a means for its being wound up, said actuator being connected to one of the members of said wheel system for said system to rotate; two balanced levers the first one of which carries a gauging permanent magnet adapted to interact with a ferromagnetic coating of the product being gauged or with the base thereof in case of a non-magnetic coating while the second lever is adapted to interact with said first balanced lever in cases where the break away force of the first balanced lever is not high enough to break-away said gauging permanent magnet from the product being gauged; two coiled springs of which one spring is connected, to said first balanced arm, and to one of the shafts of said wheel system, whereas the other coiled spring is connected, to said second balanced lever, and to said casing in such a manner as to adjust the spring tension; a magnetic element attached to said housing and adapted to attract said gauging permanent magnet. The apparatus is also provided with a reset lever for said first balanced lever. Said reset lever is locked-in with the central shaft of said wheel system, said shaft carrying a pointer to indicate the gauged thickness.