| 摘要 |
A solenoid device which is capable of suspending or supporting load devices at a first load level established mechanically and a second load level established electrically comprises a ferromagnetic base plate adapted to function as a solenoid core and a ferromagnetic holding plate hinged to the base plate. Spring means shaped to encircle the axis of the hinge strongly bias the holding plate against the base plate to provide a first and mechanical level for load retention. A solenoid coil received in the base plate closely interfits the base plate and, when energized electrically, provides a second level of power for load retention. The second level of power is rendered exceedingly efficient by a design in which the solenoid coil, except for lead connections, is fully immersed in a ferromagnetic medium which is free of air gaps.
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