Magnetic oil filter insert

Claim 1

In an engine oil filter system having an oil filter support head provided with a centrally bored boss for coaxial sealing connection with one end of a cylindrical oil filter having a central cylindrical chamber open toward said boss, the improvement comprising: an elongated tube loosely received by the filter chamber; a plurality of permanent magnets surrounding said tube in spaced-apart relation with like poles of the magnets juxtaposed; an elongated rod extending through said tube and projecting, at one end portion, into the bore of said boss; fastener means on the rod at respective ends of the tube for preventing longitudinal movement of said rod relative to said tube and maintaining the respective endmost magnet on the adjacent end portion of said tube; and, a spring having a width less than its length and having a length at least slightly greater than the inside diameter of the filter chamber and secured medially its ends by said fastener means adjacent the other end portion of said rod for centering the adjacent end of said tube in the filter chamber.