Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Reexamination Certificate
2005-09-27
2005-09-27
Donovan, Lincoln (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
C335S220000, C251S129150
Reexamination Certificate
active
06950000
ABSTRACT:
An electromagnetic actuator is provided that comprises a housing, a solenoid coil, and an armature. The armature can move between a first position proximate a portion of the housing and a second position distal of the portion of the housing. The armature and the portion of the housing define a first gap and an extension member extends in an axial direction into the first gap, thereby defining a second gap. The width of the second gap is less than the width of the first gap. The length and shape of the extension member may be varied to produce increased initial magnetic force from the solenoid coil on the armature. The length and shape of the extension member may also be varied to produce a desired armature force-displacement curve over the stroke of the actuator.
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Lanni Arthur L.
Ramanan Varagur R.
ABB Technology AG
Donovan Lincoln
Katterle, Esq. Paul R.
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