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Publication numberUS2423741 A
Publication typeGrant
Publication dateJul 8, 1947
Filing dateDec 11, 1944
Priority dateJul 1, 1943
Publication numberUS 2423741 A, US 2423741A, US-A-2423741, US2423741 A, US2423741A
InventorsVokes Cecil Gordon, Smith Arthur Albert
Original AssigneeVokes Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Filtering device
US 2423741 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

July 8, 1947 avvoKl-:s ET AL 2,423,741

FILTERING DEVICE Filed Dec. ll, 1944 Patented Jul-y 8, 1947 I l FILTERING DEVICE Cecil Gordon Vokes and Arthur Albert Smith, Guildford, England, assignors to Vokes Limited, Guildford, Surrey, England Application December 11, 1944, Serial No. 567,608 In Great Britain July 1, 1943 (Cl. 18S-71) 1 Claim.

A lter is often used on aircraft for filtering air passing to the engine intake and for other purposes in which a deeply crimped or pleated screen is formed of fine fibrous material, such for example as cotton or cellulose down, enclosed between layers of rather coarse textile fabric, such for example as buckram, and between outer layers of wire gauze. In other cases other soft brous material such as felt or soft textile fabric is stitched to or enclosed between layers of wire gauze.

It is found that as the surface of a screen of this nature approaches more nearly to perpendicular to the impact of sharp gritty particles travelling at very high velocity there is a tendency for the filter down cr soft material to be destroyed by the sand-blasting effect, which may even leave parts of the bends almost denuded after a period of use. The practicable size of unsupported panels of screens of this kind is in any case limited, so that it is common practice to subdivide the total area of air flow by some form of subdivided frame giving support to relatively small areas. The present invention provides means which combine the function of protecting the bends with that of helping to stifen and supy Y port the screen.

The above and other parts of the invention are embodied in a typical form which is illustrated by the accompanying drawings. The parts of the invention for which a monopoly is desired are those delimited by the claim.

In the drawings- Fig. 1 is a broken perspective View,

Fig. 2 is a fragmentary underside view to a larger scale.

As shown a slotted plate or grid with channelled bars I between the slots 2 is used to protect the angles or bends of a screen 3 of' the general kind described above. The air passes through the slots between the bars which lie along each angle in the position requiring protection. It is found that the bends at the outlet side sometimes also require protection and the preferred construction includes a similar grid with bars la on the outlet side of the screen. Protection is given to the inside of the bends by the use of suitably formed interior bars 4, so that there is a complete protection inside and outside the bends. Preferably light metal plate of relatively thin gauge will be used to form the grids and a loose bar 4 on the opposite side of each bend can if necessary be riveted through to the bar of the grid, staples 5 being shown for this purpose. A grid may be arranged with a number of sets of slots to make up a panel covering a large area from a number of strips of the pleated filtering screen, the ends of the pleats being suitably closed. Moreover, the Wire gauzek can sometimes be omitted and buckram or like supporting layers stiiened and the formation maintained by the bars.

We claim:

A filter including a slotted plate comprising parallel integrally connected channeled bars in spaced relation, as screen of deeply crimped formation having a plurality of offset oppositely disposed bends, the bends at one side of the screen underlying and nesting with said channeled bars, a second plate comprising parallel integrally formed channeled bars which are offset with respect to the first mentioned bars so as to underlie and nest with the screen bends at the opposite side of the screen, an independent bar nested with and extending the length of the inner side of each 'screen bend to form with the outer bars a supporting and Wear resisting binding for each of said screen bends, and tying elements extending through the screen and the inner and outer bars at each screen bend to maintain the bars and screen in relatively fixed relation.


REFERENCES CITED 'The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,203,570 Hollebone June 4, 1940 178,103 Bracker May 30, 1876 2,130,806 Link Sept. 20, 1938 1,899,007 Birkholz Feb. 28, 1933 2,130,107 Somers Sept. 13, 1938 FOREIGN PATENTS Number Country Date 468,930 Great Britain July 15, 1937

Patent Citations
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US178103 *Apr 27, 1876May 30, 1876 Improvement in ventilators for windows
US1899007 *Aug 10, 1927Feb 28, 1933American Air Filter CoRenewable filter
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2502560 *Oct 18, 1946Apr 4, 1950American Air Filter CoElectrical gas cleaner unit
US3216578 *Dec 19, 1960Nov 9, 1965Donaldson Co IncPleated filter
US3392846 *Oct 1, 1964Jul 16, 1968American Air Filter CoUnit filter assembly
US3800512 *Jul 6, 1971Apr 2, 1974Arudale Mfg IncFlexible filter element
US4042358 *May 14, 1976Aug 16, 1977Research Products CorporationFilter media
US6159258 *Dec 22, 1998Dec 12, 2000Dana CorporationAir filter elements with foam pre-cleaners
US6447566 *Jan 11, 2001Sep 10, 2002Freudenberg Nonwovens Limited PartnershipAir filtration system with recessed filter and edge banding
US6740137Jun 14, 2002May 25, 20043M Innovative Properties CompanyCollapsible pleated filter element
US6860916Jun 14, 2002Mar 1, 20053M Innovative Properties CompanyFilter assembly
US6955702Jun 14, 2002Oct 18, 20053M Innovative Properties CompanyFilter frame
US7169202Dec 24, 2003Jan 30, 20073M Innovative Properties CompanyFilter assembly
US7905974Mar 15, 2011Aaf-Mcquay Inc.Method of making a marine gas turbine filter
US8216413Jul 10, 2012AAF MC-Quay Inc.Method of making a marine gas turbine filter
US8747507 *Jun 21, 2012Jun 10, 2014Carl Freudenberg KgFilter element with guide shaft
US20030230062 *Jun 14, 2002Dec 18, 20033M Innovative Properties CompanyFilter assembly
US20030230063 *Jun 14, 2002Dec 18, 20033M Innovative Properties CompanyFilter frame
US20050138905 *Dec 24, 2003Jun 30, 2005Kubokawa James O.Filter assembly
US20110154789 *Jun 30, 2011Derek LanglandsMethod of Making a Marine Gas Turbine Filter
US20120324851 *Dec 27, 2012Carl Freudenberg KgFilter element with guide shaft
U.S. Classification55/491, 55/DIG.310, 55/500, 55/512
International ClassificationB01D46/52, F02M35/16
Cooperative ClassificationF02M35/02, F02M35/16, B01D46/10, Y10S55/31, B01D46/523
European ClassificationF02M35/16, B01D46/10, B01D46/52F4