Oil filter adapter providing parallel loop flow paths

Claim 1

An internal combustion engine oil filtration apparatus for providing parallel flow delivery to multiple filtering media from a single stream of unfiltered circulated oil and return flow in a combined stream of filtered oil from such media to oil galleries of an engine comprising an annular plate configured with an inner peripheral extremity and outer peripheral extremity wherein said inner peripheral extremity defines a central walled opening for receiving annular bushing means disposed to provide a port for filtered oil flow through said annular plate, said annular plate being further configured with at least one non-centrally disposed opening defining a port for unfiltered oil flow through said annular plate, said annular plate being further configured with a first oil flow passage and a second oil flow passage with each said passage disposed internally of said plate and opening to external environs through said outer peripheral extremity of said plate, which said passages provide branch courses for, respectively, filtered oil flow and unfiltered oil flow, wherein terminal portions of said passages opening through said outer peripheral extremity of said plate are configured to receive fittings for sealably communicating said passages to means for containing a filter medium, and further wherein another terminal portion of said second passage for unfiltered oil flow communicates through an annular face of said annular plate to external environs and further wherein another terminal portion of said first passage for filtered oil flow communicates through said inner peripheral extremity of said annular plate to said central opening, annular bushing means configured with a lesser diameter externally threaded portion disposed to extend axially outward from a face of said annular plate and further configured with an internally threaded portion of greater diameter for being received in said central opening of said annular plate, and bushing means being further configured with an outer, enlarged diameter shoulder for being operably disposed in seating contact with said annular plate to obstruct passage of direct communicating flow between said annular plate face and central walled opening, said bushing means being further provided with at least one opening disposed in the wall thereof to provide a port for communicating flow from said first passage to said central opening, said externally and internally threaded portions being complementary in size for enabling said internally threaded portion to be received in place of a spin-on filter during installation on an engine and such spin-on filter being then received on said internally threaded portion, said internally threaded portion being of external diameter at least in part to substantially fay with said central walled opening.