Patent ID: 8783471

Claim:
A filter assembly, comprising a head, a filter housing which can be removably connected to the head, and a filter element which can be received in the filter housing, the filter element comprising: a tubular wall provided with a filtration medium; a first end part provided at a first axial end of the filter element; and a second end part provided at a second axial end of the filter element; the filter housing comprising a first axial end and a second axial end, wherein the first axial end is provided with a first rotational connector part; the head comprising a second rotational connector part which can be removably engaged by the first rotational connector part, wherein the housing can be connected to the head by rotating the housing with respect to the head in a first direction of rotation and wherein the housing can be detached from the head by rotating the housing with respect to the head in a second direction of rotation, the second direction of rotation being opposite to the first direction of rotation; wherein the second end part of the filter element and the second axial end of the filter housing are provided with a locking assembly comprising: an opening provided at one of either the filter element or the filter housing; and a protrusion provided at the other one of either the filter element or the filter housing which is adapted to project in the opening; wherein the opening comprises a mouth which opens in axial direction, which mouth is, viewed in tangential direction, wider than, viewed in tangential direction, the protrusion for allowing the protrusion to enter into the opening when inserting the filter element, with its second end part directed to the second axial end of the filter housing, axially into the housing and for allowing the protrusion to be withdrawn from the opening when removing the filter element axially out of the housing; wherein the opening comprises a sloping side wall face sloping with respect to the axial direction, which sloping side wall face, viewed in axial direction from the mouth into the opening, widens said opening such that, when the protrusion has been received in the opening and is withdrawn axially from the opening, the sloping side wall face guides the protrusion in the second direction of rotation out of the mouth; and wherein the opening is provided in a ring shaped wall; wherein, viewed in tangential direction, the mouth has a first side where the sloping side wall face is provided and an opposing second side; and wherein the ring shaped wall is provided with an axial projection, the axial projection being arranged adjacent the mouth at the second side of the mouth.