EXTENDED FILTER BAG

• US 3,757,957 A
• Filed: 11/19/1971
• Issued: 09/11/1973
• Est. Priority Date: 11/19/1971
• Status: Expired due to Term

• Current Assignee: Marine Midland Bank (Delaware) NA (HSBC Holdings plc)
• Original Assignee: Edward A. Smith
• Inventors: Smith, Edward A.
• Primary Examiner(s): Zaharna, Samih N.
• Assistant Examiner(s): Spitzer, Robert H.
• Application Number:
  US05/200,331
• Time in Patent Office: 662 Days
• Field of Search: 55/364,372,368,379,380,381,382,500 210/331,346,356,483,484,486,487
• US Class Current: 210/486
• CPC Class Codes: A47L 9/14 Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles
• CPC Class Codes: B01D 29/27 Filter bags

Abstract

An improved filter bag arrangement making use of a number of internally disposed, integrally formed filter surface media adapted to increase the effective working area of the filter bag without an associated increase in external size. Drainage members are used in a manner to co-act with such additional surface areas to provide support for the internally placed filter media as well as to convey the filtered liquid to the outlet position for exit.

Claims

1. An improved filter bag including:

a body portion with an opening at the top to form a mouth;

a first compartment integral with and formed internal of said bag;

a second compartment integral with and formed internally said bag disposed on the opposite side of said first compartment;

said respective compartments extending for substantially the entire length of said bag and opened at one end;

a drainage member, being disposed in each of said respective compartments; and

a guide member disposed through said bag mouth positioned between the upper portions of said compartments to physically separate said compartments containing drainage members, during operation of an apparatus employing said filter bag.

2. A filter bag as claimed in claim 1, wherein;

said compartments are formed integrally as part of said filter bag body portion, in parallel spatial relationship with one another to effectively provide added filtering surfaces in said bag.

3. A filter bag including;

a plurality of substantially heart-shaped, permeable members having left and right lobe portions joined together about their periphery;

an open section at the top of said filter bag to form a mouth;

said left and right lobe portions, respectively, adapted to be drawn internal of said bag in a manner to form integrally disposed individual compartments within said bag;

said compartments extending across a substantial width of the internal cavity formed by drawing said left and right side lobe portions into said bag; and

a drainage member associated with each respective compartment adapted to be inserted into and in intimate contact therewith in a manner permitting positive fluid flow during actual operation with said bag.

4. A filter bag as claimed in claim 3, wherein:

said left and right lobe portions, respectively, have associated therewith a vertically extending portion integrally formed therewith;

said vertically extending portions being adapted to be drawn into said respective left and right side lobe portions internal of said bag to form respective first and second compartments in said lobe portions;

said compartments extending for substantially the length of said first and second lobe portions, and drainage members disposed in said first and second compartments.

5. A filter bag as claimed in claim 1, having elongated side portions adapted to form pockets within said filter bag, wherein additional filtering surfaces integral with said bag are formed, said elongated portions being of a width equal to or less than said filter bag diameter and of a height of equal to or less than the height of the centermost portion of said filter bag.

6. A filter bag as claimed in claims 1 including:

a drainage member constructed of a porous felt media.

7. A filter bag as claimed in claims 1 including:

a drainage member made of a molded plastic material having a waffle configuration.

8. A filter bag as claimed in claims 1 including:

a drainage member formed by a series of interlocking channels having a slot portion for internally directing fluid to a point of exit beneath said channels.

9. A filter bag as claimed in claims 1 including a drainage member formed by a series of wire mesh screens disposed in a sandwich formation.

10. A filter bag as claimed in claims 1 including a drainage member formed by sandwiching an expending metal member between a pair of wire mesh screens.

11. A filter bag as claimed in claims 1 in which:

said compartments are completely permeably sealed.

12. A method of forming a filter bag with increased filtering areas including the steps of:

joining two substantially heart-shaped permeable sections having left and right side portions to form a bag with an opening at the upper section to form a discreet mouth;

drawing said left side and right side portions into the interior of said bag in a manner to form a plurality of integrally lodged compartments within saiD bag having openings at the sides of said bag;

placing into each of said compartments a drainage member adapted to extend substantially into said compartments; and

inserting a guide member through said mouth opening onto the upper portion of said compartments containing said drainage members to thereby control the spatial relationship therebetween.