Patent ID: 7952455

Claim:
A magnetic device comprising: a housing having a front wall, a first magnet assembly having a north pole and a south pole, said first magnet assembly being mounted to said housing and pivotal about a first axis between a first position in which one pole of said first magnet assembly is positioned adjacent said front wall of said housing, and a second position in which said one pole of said first magnet assembly is retracted from said front wall of said housing, a second magnet assembly having a north pole and a south pole, said second magnet assembly being mounted to said housing and pivotal about a second axis spaced from and parallel to said first axis between a first position in which one pole of said second magnet assembly faces and is positioned adjacent said front wall of said housing, and a second position in which said one pole of said second magnet assembly is retracted from said front wall of said housing, an actuator which, when powered, pivots said first and second magnet assemblies from their respective said second positions to their respective said first positions, and a spring which urges said first and second magnet assemblies toward their respective said second positions so that, upon failure of said actuator, said spring urges said first and second magnet assemblies to their respective said second position positions.