Patent ID: 8057669

Claim:
A filter assembly, comprising: a filter cartridge comprising: a housing having a first outer annular sidewall; a cover at one end of the housing, the cover having an inlet port and an outlet port; filter media disposed within the first outer annular sidewall; a mounting thread provided by one of the housing and the cover; and a torsion lock detent provided by one of the cover and the housing radially between the mounting thread and the inlet and outlet ports; and a filter base comprising: a second annular sidewall including an open end sized to receive an end of the housing therethrough, the second annular sidewall including an inclined shelf corresponding to the mounting thread formed in a radially inner surface of the second annular sidewall, the shelf facing axially away from the open end of the second annular sidewall, the second annular sidewall having an inner diameter being less than an outer diameter of the mounting thread; a lock assembly including a ramped surface terminating in a lock slot, the ramped surface abutting the torsion lock detent when the mounting thread is inserted into the thread slot; wherein the open end of the second annular sidewall includes an opening formed therein at an end of the shelf through which the mounting thread is received and a terminating end axially offset from the opening, and wherein the lock assembly comprises an annular locking member including the ramped surface on an axial end thereof, the annular locking member being axially moveable relative to the second annular sidewall; and a biasing member axially biasing the annular locking member in a direction extending axially from the terminating end toward the opening.