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Publication numberUS2862624 A
Publication typeGrant
Publication dateDec 2, 1958
Filing dateApr 26, 1955
Priority dateApr 21, 1954
Publication numberUS 2862624 A, US 2862624A, US-A-2862624, US2862624 A, US2862624A
InventorsStokes Edward Arthur
Original AssigneeVokes Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Filter elements
US 2862624 A
Images(1)
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Description  (OCR text may contain errors)

'Dec.2,1958 E. A. STOKES 2,862,624

FILTER ELEMENTS Filed April 26, 1955 ABCDaE C D E F U U P [)0 N DOWN 00 UP UP DOWN I 7 I K7 Y Ed 2.

f UP

DOWN Up r ?4 '3 v U P DOWN \/\7\7\7 DOWN 1 DOWN I :00 WN r DOWN 1 DOWN.

m VEMraQ fan/44 04 J;'0K

United StatesPatent 2,862,624 FILTER ELEMENTS Edward Arthur Stokes, Guildford, England, assignor to Vokes Limited, Guildford, England Application April 26, 1955, Serial No. 503,953

- 2 Claims. or. 210-493 such as paper or compressed fibre, which have little inherent rigidity it is often necessary to support the fins by means of wire gauze or by a grid or the like in order to prevent the side walls of adjacent fins from contacting one another and becoming ineffective as they are distended by the pressure of the fluid being filtered. In the case of expendable elements it is not uncommon for the cost of the element supporting medium or structure to exceed by far the cost of the filtering medium itself.

It is the object of the present invention to provide an element of the finned or pleated type, which requires little or no support except at the periphery, but which is capable of maintaining the walls of each fin or pleat in proper spaced relationship under ordinary conditions of use.

According to the invention a finned or pleated filter element is provided with series of corrugations or zig-zag folds substantially normal to the ordinary lines of fold of the fins or pleats, the ordinary lines of fold of the fins or pleats being modified from straight lines to appropriate zig-zag lines so that the apices of the fins or pleats are maintained apart while the walls of the fins or pleats are stiffened by the corrugated or zig-zag folded form thereof.

Put in another way a filter element according to the invention is comprised by at least one sheet of filtering medium formed with pleats or fins by folding the sheet in alternately directed bends in zig-zag fashion, the folded sheet being then folded inv similar zig-zag fashion substantially at right angles to the first lines of fold, the said first lines of fold being then modified from parallel straight lines to parallel zig-zag lines, whereby the fins or pleats are strengthened by folds transverse to their depth and maintained open by the geometrical form of those folds.

The resultant shape is not easy to visualise, but an illustrative model can be easily made in the following manner. Take a rectangular sheet of paper and fold it in half with a light fold parallel to one edge. Now fold the double sheet in zig-zag fashion at right angles to the first fold to form a number of pleats or corrugations. Pull the free edge of the apex of each corrugated half sheet away from its complementary edge by a short distance (say A"), and, maintaining this relationship, impress theresultant modification of fold firmly onto the first made lightfold. This fold will now be found to be modified from a straight line to a zig-zag line, and if the folded sheet is extended concertina-fashion along an axis parallel to the original light fold it will be found that the corrugated free edges are maintained effectively apart. The original light fold is representative of one of the fin edges of an element and the folds at right angles thereto are representative of the stiflt'ening corrugations.

The invention is illustrated in the accompanying drawings of a filter element section and a blank from which it may be folded. In the drawings:

Fig. 1 is a perspective view of a part of an element. Fig. 2 is a plan of a blank from which a part of an element such as shown in Fig. v1 can be folded.

Considering first Fig. l and assuming the right hand side of the drawing to represent the fluid inlet side it will be seen that the element presents to the flow folded edges 2,4, 6 and 8 and a plain edge 10, while the exit side of the element presents a plain edge l'and folded edges 3, 5, 7 and 9. There are, in effect four complete pleats. All of the pleats are formed substantially at right angles to their folds with a zig-zag or corrugated forma-' tion by the impression therein offolds having apices or lines of fold A, B, C, D, E, F, G, H and J.' These folds not only add strength to the pleated element but keep the pleats apart owing to their geometry. Fig. 2 shows Likewise the lines A, B I represent the lines ofzig-zag folding A, B J in Fig. 1.

The fold lines on Fig. 2 are designated Up or Down as the case may be to indicate that the adjacent surfaces are bent upwards or downwards.

Bending the sheet of Fig. 2 in the senses indicated will produce the element of Fig. 1.

The depth and pitch of the corrugations running across the length of the fins can be varied, depending upon the initial rigidity of the filter medium employed; for lower rigidity of filter medium the depth and pitch of the corrugations is reduced to obtain the required stilfness.

It may not generally be possible to fold the full number of fins required to form the filter element in one operation, due to the fact that when applying the corrugations cracking of the filter medium may occur when a number of layers are corrugated in the same operation. Under such circumstances, single sheets or three or four fins, dependent upon the nature of the filter medium, can be corrugated at a time, and having impressed the crease lines, the material may then be opened out. Having corrugated sufiicient sheets or sections to form the complete filter element, the leading and/or trailing edges of adjacent sections are then glued together in jigged relationship by .an adhesive. The edges of the sheets or sections may be coated with a pressure adhesive substance to facilitate this operation. Having performed the sticking operation the element can then readily be closed in on the width and the corrugations throughout the length of the fin will again take shape.

A variety of methods of sealing the filter element into its final housing may be devised, but the cheapest method is to use adhesive to stick the sides of the fins to the walls of the filter housing. Alternatively the Walls of the filter housing may be constructed to have adjacent to them the required number of tapered fingers attached only at one edge of the filter housing. The paper element can then be inserted into the housing in such a way that a tapered finger is situated between each corrugated tin of the element, thus retaining the folded edges of the fins in close contact with the wall of the housing. Dependent upon the rigidity of the medium used it may or may not be necessary to support the fins along the leading and trailing edges at intervals across the width of the element.

little way into the depth of the cavity between the fins, I

can be employed.

I claim:

1. A filter element comprised by a sheet of permeable" filter material, said' sheet being folded in zigzag fashion along one series of parallel straight lines and being folded in zigzag fashion along. another series of alternately inclined straight lines substantially but not precisely at right angles to the said first series of lines, the aberration" from rectangularity being such as to maintain pleats formed by said first folding apart from one another at minor acute angles.

2'. The method of forming a'pleated filter element, comprising folding at least one sheet of filtering medium upon itself in alternately directed folds in zigzag fashion along a first series of straight parallel lines to form first pleats, folding the pleated sheet upon itself in similar zigzag fashion along a second series of straight parallel lines substantially at right angles to said first series of lines to form a plurality of second pleats in each of said first pleats with the secondpleats in interleaved relation,

expanding the folded sheet to dispose said first pleats at minor acute angles relative to each other, and modifying the folds coincident With said first series of straight parallel lines to extend along alternately inclined straight lines generally but not precisely at right angles to said second series of lines, whereby the first pleats are strengthened by folds transverse their depth and main tained Open at minor acute angles by the geometrical form of those folds.

References Cited in the file of this patent UNITED STATES PATENTS

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2556521 *Nov 14, 1946Jun 12, 1951Fram CorpFilter element
US2683537 *Jun 11, 1949Jul 13, 1954Fram CorpPleated filter element
FR1094978A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3433692 *Aug 8, 1962Mar 18, 1969Marc Wood Materials Sa Pour LaMethod for forming herringbone configurations for sandwich structures
US5458374 *Jun 22, 1994Oct 17, 1995Vijuk; RobertUniversal non-jamming multi-ply multi-fold outsert with compact peripheral edges (and related method)
US5813700 *Jun 19, 1995Sep 29, 1998Vijuk; Joseph M.Methods of folding outserts
US5909899 *Feb 26, 1998Jun 8, 1999Vijuk; Joseph M.Method of folding a sheet
US6068300 *May 6, 1999May 30, 2000Joseph M. VijukMethods of forming printed informational items
US6158778 *Dec 22, 1999Dec 12, 2000Joseph M. VijukMethods of folding outserts
US6273411Jun 7, 1999Aug 14, 2001Vijuk Equipment, Inc.Booklet forming method and apparatus
US6349973Oct 26, 2000Feb 26, 2002Joseph M. VijukMethods of folding outserts
US6506275May 26, 2000Jan 14, 2003Vijuk Equipment, Inc.Informational item forming and bonding machine and method
US6645134Sep 12, 2001Nov 11, 2003Vijuk Equipment, Inc.Outsert-forming apparatus
US6656103Nov 28, 2000Dec 2, 2003Vijuk Equipment, Inc.Informational item forming machine and method
US6669235Jan 8, 2002Dec 30, 2003Joseph M. VijukMethods of folding informational items which have printed information, such as instructions and/or warnings, relating to pharmaceutical products
US6709374Jan 18, 2002Mar 23, 2004Vijuk Equipment, Inc.Booklet-forming machine and method
US6752429Feb 1, 2002Jun 22, 2004Joseph M. VijukMethods of forming informational items
US6793614Aug 22, 2003Sep 21, 2004William C. NeubauerOutsert-forming machine and method
US6808480Sep 12, 2001Oct 26, 2004Vijuk Equipment, Inc.Outsert-forming apparatus with glue verification
US6837290Oct 22, 2002Jan 4, 2005Vijuk Equipment, Inc.Informational item bonding machine
US6852072Feb 18, 2004Feb 8, 2005Vijuk Equipment, Inc.Booklet-forming machine
US6902197Apr 22, 2003Jun 7, 2005Joseph M. VijukMethods of forming informational items
US6964413Jul 20, 2004Nov 15, 2005Vijuk Equipment, Inc.Booklet forming method and apparatus
US7121992Aug 22, 2003Oct 17, 2006Vijuk Equipment, Inc.Informational item forming machine and method
US7175586Mar 21, 2005Feb 13, 2007Vijuk Equipment, Inc.Methods of forming outserts
US7182723Sep 14, 2004Feb 27, 2007Vijuk Equipment, Inc.Informational item final folding apparatus
US7247129Sep 17, 2004Jul 24, 2007Neubauer William COutsert-forming method
US7396322Nov 14, 2005Jul 8, 2008Vijuk Equipment, Inc.Informational item forming machine and method
US7476193Sep 14, 2004Jan 13, 2009Vijuk Equipment, Inc.Modular folding and pressing apparatus
US7621862Jul 24, 2007Nov 24, 2009Vijuk Equipment, Inc.Outsert-forming method
US7771517 *May 14, 2007Aug 10, 2010Global Finishing Solutions, L.L.C.Filtering method
US7896796May 20, 2008Mar 1, 2011Vijuk Equipment, Inc.Methods of forming outserts and outserts formed thereby
US8029430Nov 23, 2009Oct 4, 2011Vijuk Equipment, Inc.Outsert-forming method
US8485558Jun 22, 2009Jul 16, 2013G&K-Vijuk Intern. Corp.Informational item forming method
US8491689Dec 12, 2008Jul 23, 20133M Innovative Properties CompanyJoined filter media pleat packs
DE1163293B *Dec 23, 1959Feb 20, 1964Mine Safety Appliances CoVerfahren zur Herstellung eines Zickzack-Filterelements
DE1202762B *Mar 30, 1960Oct 14, 1965Mine Safety Appliances CoVerfahren zum Herstellen eines Filtereinsatzes mit zickzackfoermig verlaufenden Filterlagen
EP2042359A1 *Sep 19, 2008Apr 1, 2009Valeo Systemes ThermiquesFilter device and motor-vehicle air-conditioning system which employs the same
EP2240255A2 *Dec 12, 2008Oct 20, 20103M Innovative Properties CompanyJoined filter media pleat packs
Classifications
U.S. Classification428/181, 55/521, 281/21.1, 210/487, 281/5
International ClassificationB01D29/11, B01D46/52
Cooperative ClassificationB01D46/522, B01D46/54, B01D2201/12, B01D29/111
European ClassificationB01D29/11B, B01D46/52F2, B01D46/54