Patent ID: 7765032
Filing Date: 2010-07-27
Classification: B62D,H01F

Abstract:
1. A magnetic on-off attachment device, comprising: a) a first ferromagnetic portion; b) a second ferromagnetic portion; c) a magnetic insulator magnetically isolating said first ferromagnetic portion from said second ferromagnetic portion; d) a dipole magnet movable relative to each of said first and second ferromagnetic portions so as to provide the magnetic on-off attachment device with an on state in which the magnetic on-off attachment device has a maximum magnetic attraction to a ferromagnetic body that is not part of the magnetic on-off attachment device and with an off state in which the magnetic on-off attachment device has a minimum magnetic attraction to the ferromagnetic body; and e) an actuating mechanism operatively coupled to said dipole magnet so as to move said dipole magnet relative to each of said first and second ferromagnetic portions in response to an actuating signal so as to alternatingly switch the magnetic on-off attachment device between the on state and the off state.