Abstract: A solenoid device is provided which includes a bobbin having an armature bore through its center; a plunger partially extending into the bore and serving as an armature of the solenoid; and a coil wound around the bobbin for generating magnetic flux to move the plunger axially in the bore. The plunger includes a first segment which moves axially in the bore of the bobbin in response to magnetic flux generated by the coil. The plunger also includes a second segment which serves as the latching device for the locking mechanism. Finally, the plunger includes a linkage connecting the first and second segments together and mounting devices for mounting the linkage to the first and second segments. This linkage pivots in response to a compressive force applied to the plunger and engages a stop disposed proximate the plunger, preventing the second segment from moving out of a latching position.

Abstract: An improved bi-stable electromagnetic actuator is provided having an armature linkage moveable between two stable positions either manually or through the application of an appropriate electrical pulse. The actuator includes a permanent magnet which maintains the actuator armature in a first stable position. It also includes a coil which reduces the magnetic flux used to restrain the armature and allows a compression spring to advance the armature to a second stabled position. In moving from the first to the second positions, the armature engages a stop on the linkage and drives the linkage in the same direction. The linkage, thus, transmits the mechanical action of the armature. The user may manually advance the linkage from the first to the second stable position. This linkage includes a rod of magnetically impermeable material in sliding engagement with the armature and a sleeve disposed around this rod at one end of the rod. This sleeve is made from soft magnetic material.