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US 4,476,451 AGranted
Solenoid actuator
AssigneeShoketsu Kinzoku Kogyo Kabushiki Kaisha
InventorSeiji Kosugi
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AssigneeShoketsu Kinzoku Kogyo Kabushiki Kaisha
InventorSeiji Kosugi
Estimating the term…
The solenoid actuator of this invention is provided with a magnetic flanged member for reinforcing the bobbin structure and reducing the magnetic resistance having a flanged portion and a cylindrical portion and inserted said cylindrical portion, whose inner surface is coated with a thin film made of feeble or non-magnetic and wear-resistant material, into the central aperture in a non-magnetic reel-shaped bobbin wound therearound with an energizing coil, and a movable core inserted into the central aperture in the bobbin is guided along the cylindrical portion of the flanged member, whereby the frictional abrasion caused by the sliding movement between the cylindrical portion of the flanged member and the movable core is suppressed and the frictional force caused by the uneven abutment between the outer surface of the movable core and the inner surface of the cylindrical portion of the flanged member is made relatively small to suppress the reduction of the attraction force between the stationary core and the movable core and thereby attaining a smooth operation of the movable core.
A solenoid actuator comprising a non-magnetic reel-shaped bobbin wound therearound with an energizing coil, a magnetic frame disposed to the outside of said bobbin for forming magnetic flux paths, a magnetic flanged member having a cylindrical portion and a flanged portion with the cylindrical portion inserted into the central aperture in said bobbin for reinforcing the bobbin structure and reducing the magnetic resistance and a pair of cores inserted directly into the central aperture in said bobbin that exert electromagnetic force toward each other upon supply of energizing current to said coil, the outer circumferential surface of one of the cores which is made movable being opposed directly with a slight gap to the inner surface of the cylindrical portion of said flanged member and the flanged portion of said flanged member being in contact with said magnetic frame, so as to attract said movable core to the other of the cores by said electromagnetic force, wherein the inner surface of the cylindrical portion of said flanged member is coated with a thin film made of feeble or non-magnetic and wear-resistant material.
Dependencies are inferred from the claim text.