Solenoid device

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device

Patent

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Details

335236, 335246, 335253, H01F 708

Patent

active

053231341

ABSTRACT:
A solenoid comprising a first coil positioned within a frame from which a magnetizable armature, having a coil end and a free end, extends, the coil end of the armature having a section of non-magnetizable material secured to it, and a second coil, which coil is energizable in a manner independent from that of the first coil, the second coil being secured to the other end of the non-magnetizable material so as to move with the armature from a position adjacent the first coil when the armature is in extended position to a position spaced therefrom when the armature is in retracted position, whereby when the first coil is energized to move the armature along its throw into retracted position, the second coil is simultaneously energized so as produce a repulsive magnetic force with respect to that of the first coil. Magnetizable bridge devices are secured to the frame and automatically movable, upon energization of the coil and movement of the armature along its throw to retracted position, to become seatably positioned within the space between the coils over an end of the first coil in contact with the armature to provide across the coil end of the armature a magnetically conductive path for the magnetic field which will hold the armature firmly in retracted position, and, upon de-energization of the coils and return of the armature to its extended position, to become automatically moved from its seated position to a position and become clear of the space between the first and second coils.

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