Patent ID: 6279524
Filing Date: 2001-08-28
Classification: F01L,H01F

Abstract:
An electromagnetic actuator for operating a driven member, comprising(a) an electromagnet having(1) a yoke provided with a pole face and a passage; and(2) a coil supported by said yoke and adapted to be supplied with electric current to produce an electromagnetic force;(b) an armature connectable to the driven member and movable in a path of motion into a first position and a second position spaced from said first position; said armature being moved by the electromagnetic forces into said second position in contact with said pole face;(c) a resetting spring coupled to said armature and exerting a spring force thereon for urging said armature away from said second position toward said first position;(d) a dampening assembly including(1) a piston affixed to said armature; and(2) a dampening cylinder provided in said yoke and having an open end oriented toward said armature and being in an axial alignment with said piston; in said first position of said armature said piston being axially spaced from said dampening cylinder; said piston entering said dampening cylinder solely during a terminal portion of said path of motion during displacement of said armature toward said second position; said passage of said yoke being in axial alignment and in communication with said dampening cylinder;(e) a guide bar affixed to said armature and passing through said passage; and(f) a sleeve positioned in said passage; said guide bar passing through said sleeve; said sleeve having an end portion situated at said pole face; and said end portion forming a socket accommodating said dampening cylinder.