Magnetic tripping device
AssigneeBrown, Boveri & Cie AG
InventorsRolf Goehle, Volker Schmitt, Werner Bruckner, Klaus Greefe
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Abstract
A magnetic tripping device for an electrical wiring device includes a U-shaped magnetic yoke, a cylindrical non-magnetic coil form having two end surfaces and a periphery and being disposed in the magnetic yoke, a magnetic core disposed in the coil form, a magnetic armature movably disposed in the coil form, and a compression spring disposed in the coil form between the magnetic core and the magnetic armature, the coil form having at least two radial embossings uniformly distributed over the periphery in the vicinity of the end surfaces for fixing the magnetic core in place in the coil form and for guiding the magnetic armature in the coil form with a limited stroke and a sliding fit.
Claims11
Magnetic tripping device for an electrical wiring device, comprising a U-shaped magnetic yoke, a cylindrical non-magnetic coil form having two end surfaces and a periphery and being disposed in said magnetic yoke, a magnetic core disposed in said coil form, a magnetic armature movably disposed in said coil form with a sliding fit, and a compression spring disposed in said coil form between said magnetic core and said magnetic armature, said coil form having means in the form of at least two radial embossings uniformly distributed over said periphery in the vicinity of said end surfaces for fixing said magnetic core in place in said coil form and for guiding said magnetic armature in said coil form with a limited stroke, said compression spring having a given positioning force acting on said magnetic armature for a tripping current intensity of a given magnitude, and including a pressure washer disposed outside said coil form and locked to said magnetic yoke for absorbing part of said positioning force and conducting forces transmitted by said magnetic armature to said magnetic yoke.
Dependencies are inferred from the claim text.