Patent ID: 6646529
Filing Date: 2003-11-11
Classification: H01H

Abstract:
An electromagnetic release, comprising:a yoke; a spring disposed in said yoke and having a spring force; a plunger loaded by said spring in a release direction; a permanent magnet configuration associated with said yoke and said plunger and having a magnet flux, an attraction force, and an active range; a coil associated with said yoke and generating in said yoke a magnetic coil flux opposed to said magnet flux such that, when said magnetic coil flux is released, said spring force overcomes said attraction force of said permanent magnet configuration; at least one pole shoe having an active range in magnetic communication with said yoke and said plunger, said at least one pole shoe and said permanent magnet configuration conducting said magnetic coil flux to said plunger such that: in a first position of said plunger, said plunger is located in said active range of said permanent magnet configuration and in said active range of said at least one pole shoe, and both said magnetic coil flux and at least part of said magnet flux run through said plunger; and in a second position of said plunger, said plunger is located at least partly in said active range of said at least one pole shoe, and said magnet flux runs through said yoke, said plunger, and said permanent magnet configuration; and said at least one pole shoe and said permanent magnet being cast into a cylindrical body to form a coil former, with said coil, said coil former, said at least one pole shoe, and said permanent magnet forming a preassembled unit.