Solenoid with magnetic control of armature velocity
AssigneeAutomatic Switch Company
InventorsJohn J. Haller, Stanley B. Roedel
Life of this patent
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Abstract
A low-noise solenoid has an armature with a projecting ridge receivable within a groove in a pole piece. As the ridge enters the groove, the magnetic force which opposes a return spring decreases until there is equilibrium whereat the armature remains suspended without impacting upon the pole piece.
Claims5
In a solenoid actuator selectively energizeable by a source of electric current, and having a core tube with two opposite ends and a winding circumscribing said core tube, a stationary pole piece mounted at one end of said core tube, and an axially reciprocable armature slidably mounted in said core tube for movement between an energized position adjacent said pole piece when said winding is energized and a deenergized position distal from said pole piece, the improvement wherein one of said movable armature and said stationary pole piece has axially extending projection means comprising a circular ridge having a rectangular cross section, and the other of said movable armature and said stationary pole piece has a complementary groove in the form of a circular channel with a rectangular cross section having a width slightly greater than the width of said ridge for receiving said projections means when said armature is in said energized position at an equilibrium position whereat said armature floats with no direct contact between said armature and stationary pole piece.
Dependencies are inferred from the claim text.