Liquid filter and filter element

• US 4,204,966 A
• Filed: 01/02/1979
• Issued: 05/27/1980
• Est. Priority Date: 11/25/1977
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Filter Specialists, Inc. (Danaher Corporation)
• Inventors: Morgan, Howard W. Jr.
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Application Number:
  US06/000,174
• Time in Patent Office: 511 Days
• Field of Search: 210/455, 210/473-475, 210/477-479
• US Class Current: 210/455
• CPC Class Codes: B01D 2201/34 Seals or gaskets for filtering elements for removable closures, lids, caps or filter heads B01D2201/304
• CPC Class Codes: B01D 2201/4015 Bayonet connecting means
• CPC Class Codes: B01D 29/23 arranged for outward flow filtration
• CPC Class Codes: B01D 29/27 Filter bags

Abstract

A liquid filter having a housing which includes a chamber enclosed by a cap. A filter is positioned within the chamber and includes a flange which makes a hermetic seal with the housing.

Claims

1. In a liquid filter including a housing having a side wall defining a chamber therein, said chamber having an opening, an annular support carried by said housing and defining at least in part said chamber opening, an inlet port and an outlet port, the improvement comprising a filter bag having a wall part formed of a flexible liquid pervious material and a ring part formed of a shape-retaining liquid impervious material, said bag ring part including an annular lip defining the opening into said filter bag and an outturned annular flange, said bag wall part joined to said lip of the bag ring part, said filter bag fitting in said chamber with its wall part extending through said chamber opening within the path of liquid flow between said inlet and outlet ports and with its said ring part flange contacting said support, said ring part flange forming (at all times when contacting said support) a circumferential hermetic seal between said ring part and housing.

2. The liquid filter of claim 1, wherein said ring part flange forms said circumferential hermetic seal between said ring part and said housing at all times when contacting said support.

3. The liquid filter of claim 2 and a reticulated basket having an opening therein defined by a marginal edge, said basket fitted within said chamber and spaced from said housing side wall, said bag wall part extending into said basket and having said ring part flange of the bag overlying said basket marginal edge, said basket marginal edge constituting a part of said support for said filter bag.

4. In a liquid filter including a housing having a side wall defining a chamber therein, said chamber having an opening, a cap spanning said chamber opening, an inlet port and an outlet port, the improvement wherein said housing includes an annular shoulder located adjacent said chamber opening and spaced from said cap, said shoulder projecting into the interior of said chamber and there terminating in an end face, a removable filtering basket including an annular flange carried by said shoulder and a wall joined to said basket flange, said basket wall having reticulated parts spaced from said housing side wall, said inlet and outlet ports located in liquid flow communication through said basket wall reticulated parts, camming means associated with said housing shoulder and basket for urging said basket flange toward said housing shoulder upon rotation of the basket relative to the housing.

5. The liquid filter of claim 4 and an annular resilient seal supported upon said housing shoulder, said basket flange urged into liquid sealing contact with said seal.

6. The liquid filter of claim 4 wherein said camming means includes a pin carried by one of said basket wall and housing shoulder end face and a slot defined by a cam side surface formed in the other of said basket wall and housing shoulder end face to receive said pin upon insertion of the basket into said housing, said pin fitting into said slot in contact with said slot side surface.

7. The liquid filter of claim 6 and at least two pins carried by said one basket wall or housing shoulder end face, at least two slots each defined by a cam side surface formed in said other basket wall or housing shoulder end face, each pin fitting into a said slot in contact with the side surface thereof.