Filter unit

• US 20030062301A1
• Filed: 01/10/2002
• Published: 04/03/2003
• Est. Priority Date: 01/10/2001
• Status: Abandoned Application

• Current Assignee: Walker Filtration Ltd. (Atlas Copco AB)
• Original Assignee: Walker Filtration Ltd. (Atlas Copco AB)
• Inventors: Taggart, Richard Lawrence, Merrie, Kenneth
• Application Number:
  US10/041,758
• Publication Number:
  US 20030062301A1
• Time in Patent Office: Days
• US Class Current: 210/454
• CPC Class Codes: B01D 2201/301 Details of removable closures, lids, caps, filter heads
• CPC Class Codes: B01D 2201/305 Snap, latch or clip connecting means
• CPC Class Codes: B01D 2201/34 Seals or gaskets for filtering elements
• CPC Class Codes: B01D 2201/4015 Bayonet connecting means
• CPC Class Codes: B01D 2265/025 making use of ramps or cams
• CPC Class Codes: B01D 2265/028 Snap, latch or clip connecting means
• CPC Class Codes: B01D 2271/02 Gaskets, sealings
• CPC Class Codes: B01D 29/114 arranged for inward flow filtration B01D29/15, B01D29/33 take precedence
• CPC Class Codes: B01D 29/96 in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters B01D29/09, B01D29/70 take precedence
• CPC Class Codes: B01D 46/2411 Filter cartridges
• CPC Class Codes: B01D 46/88 Replacing filter elements

Abstract

A filter unit comprises a housing through a wall of which is formed an aperture, an annular insert of a plastics material located in said aperture to make sealing contact with the defining walls of the aperture, a closure member removably mounted in, to make sealing engagement with, the annular insert, and a filter cartridge mounted on the closure member to extend into the housing, the closure member and filter cartridge being locatable on and removable from the housing as a unit.

Claims

1. A filter unit comprising a housing having a wall defining therein an aperture, an annular insert of a plastics material located in said aperture to make sealing contact with the defining wall of the aperture, a closure member removably mounted in, to make sealing engagement with, the annular insert, and a filter cartridge mounted on the closure member to extend into the housing, the closure member and filter cartridge being locatable on and removable from the housing as a unit.

2. A filter unit as claimed in claim 1 in which the annular insert and the closure member are injection molded from a plastics material such as polybutyleneterephthalate.

3. A filter unit as claimed in claim 1 in which the annular insert is a push snap fit into the aperture.

4. A filter unit as claimed in claim 3 in which the annular insert carries an annular sealing ring reacting between the insert and the housing.

5. A filter unit as claimed in claim 1 in which the removable connection between the cover member and the annular insert comprises a push-and-turn bayonet type connection, co-operating ramped shoulders being formed internally on the annular insert and externally on the cover member, the cover member carrying an annular sealing ring reacting between the cover member and the annular insert.

6. A filter unit as claimed in claim 5 in which the shoulders on the insert and on the cover member are provided with co-operating means for retaining the cover member in its fully inserted position in the insert.

7. A filter unit as claimed in claim 6 in which the co-operating means comprise lugs and recesses.