Патент USA US2403261код для вставки
July l2, 1946. L. J. CLARK FILTER 2,403,261 4 Fi1ed~Apri1 1_, 19'44 »lin. Patented July 2, 1946 v2,403,261 UNITED STATES PATENT OFFICE 2,4oa261 FILTER Llewellynn J. Clark, Grand Rapids, Mich., assign or to The Tanglefoot Company, Grand Rapids, Mich., a corporation of Michigan Application April 1, 1944, Serial No. 529,063 2 Claims. (Cl. 183-75) l . 2 My invention relates to ñlter structures adapt ed particularly for cleaning or conditioning air e ‘ Y A outer sheets I0 and II and the intermediate or spacer sheet I2. The outer ` inar and comprises the ' or other gases by withholding and removing dust sheets I 0 and II are coated on one side with and other particles from the flowing air. More specifically, the invention contemplates the pro duction of filtering structure in which flow pas sageways are provided whose walls have sticky or tacky substance applied to their inner faces so that dust or other foreign matter flowing sticky substance I3, the spacer sheet I2 being interposed between the sticky sides of the outer sheets to be bonded thereto by- the sticky ma terial. This intermediate 0r spacer sheet isof sinuous cross section or corrugate form the crown caught by the sticky substance and thus with or apex portions I5 being engaged by the sticky sides of the outer sheets so that the resulting passages I4 will be vclosed except for longitudinal drawn from the. flow for cleaning and condition flow therethrough of air or gas. With >this ar ing thereof. So-called “Tanglefoot” sticky iiypaper has been rangement the sticky material on the outer sheets between the crown portions of the corrugation in use for many years for catching insects, and one of the objects of the invention is the utili-4 'will be exposed to the interior of the passages, zation of such paper sheets coated with sticky substance in the production of iilter fabric'or ele _ments for filtering and- cleaning air or other will creep a distance along the side walls of the passages to increase the sticky area exposed to air or gas flow. Dust or other foreign particles through the passageways with air or gas will be i gases. but, by capillary attraction, the sticky substance 20 in the air flow will strike the sticky surface‘and In accordance with my invention the filtering will be withheld from the flow for cleaning and conditioning thereof. In orderto increase the effectiveness of withdrawal of dust and foreign particles from the air iiow by the sticky sub fabric or element may be in sheet form compris ing an intermediate channeled or corrugated sheet between outer sheets of paper coated on their inner sides with tacky substance which acts “ stance, the intermediate sheet I2 may be con as a bond to secure the' outer sheets to the in termediate sheet, and which is exposed in the passages deñned by the sheets for catching and withdrawing dust or other foreign matter from the air or gas flowing through the passages. structed so that the channels therein are longi tudinally wavy or sinuous as indicated at I 6, Fig ure 2. With this arrangement the sticky area ' exposed to dust or other particles in the passages 30 I4 will be materially increased without any sub From the ñltering fabric thus formed, various types of filter structures may. be produced. For stantial interference with or reduction of the air iiow through the passages. example the filter fabric may be cut into small The sticky substance should be such that it will be non-running but sufliciently tacky through a sheets or units which may be assembled and ar ranged in various ways for flow of the air or gas 35 relatively wide range of temperature. For exam through the sticky passages of the assembly, The various features and utility of my inven tion will become apparent from the following specification and accompanying drawing, in 40 which drawing: ple, the sticky substance could be such that it would not run at 135° F. and would still stay tacky at _20° F. A formula to be used might be the following: ` Per cent . Non-drying vegetable oil from ________ __ 25 to 35 Figure 1 is a transverse section of a portion of Blown non-drying vegetable oil _______ __ 5 to 10 the ñlter fabric or element; ’ Wood rosin__'_ ______________________ __ 55 to 65 Figure 2 is a plan View of a portion of the in Vegetable wax (carnauba wax) ______ __ 2 to 6 termediate or spacer element of the fabric; 45 In the`v fabrication of the ñlter units or sheets, Figure 3 shows the end of a filtering structure the outer sheets I0 and I I are preferably of paper formed by rolling or winding up a length of the impervious to the sticky substance so that the filtering fabric; outer sides thereof will not be sticky. The inner Figure 4 is a cross section of a filter structure or spacer element I2 could be of paper of a y in which the sheets of the filter fabric are assem bled in stepped relation for intercepting air or 50 more ñbrous or porousnature so that the sticky substance from the outer layers may travel there gas flow for cleaning thereof; and along by capillary attraction or ooze through the Figure 5 Vshows sheets of the fabric assembled pores thereof, thus to further increase the sticky within a rectangular housing to form a filter area exposed in the passages I4 to the air or structure cell or unit. Referring to Figure 1 the filtering fabric is 1am 55 gas flow. 2,403,261 4 3 of such viscosity as to be retained as a coating on the walls for removing dirt from air flowing through said passages, said unit consisting of two fibrous outer sheets of material impervious Figure 3 shows a cylindrical ñlter structure in which a band of the ñlter fabric is wound into a roll I1 and housed within a tubular container I8. A ñlter structure of this shape may be readily included in piping through which Vair or gas Yñows to be cleaned by the filter roll. Figure 4 .shows a filter structure in which a to the tacky substance Yused to prevent the outer surfaces of the outer sheets from becoming sticky, an intermediate sheet of sinuous form between saidouter sheets to separate them, said interme diste sheet being pervious to the tacky substance ' fabric are stacked together'in stepped relation within a suitable container or housing 29 having 10 yused, the inner surfaces of the outer sheets being an inlet opening 2| Vin one side and an outlet' " coated with a tacky substance, said tacky sub opening 22 in the other side. When this filter " ' stance constituting the sole means for bonding plurality of rectangular sheets I9 of the ñlter the intermediate sheet to the outer sheets to com structure is placed in the path o_f air. or gas to .. be cleaned, the air or gas will' flow-»throughthe ' plete the unit,l the said three sheets forming va ñlter unit defining ñow passages for circulating air in which the exposed tacky substance'serves inlet opening 2l for distribution of theñow .15 '_ through outflow from the passages the other I4 of ends thethereof ñlter sheets into the forv to remove the dirt from the flow. _ 2. -A self-supporting air ñltering unit formed outlet 22 of the housing. Figure 5 shows a plurality of rectangular sheets i ' with a plurality of air passages through ithav 23 of .the Vvfilter fabric, assembled in a _vertical 20 ing a tacky substance on the walls of saidpas sages of such viscosity as to be retained as a stack Within va rectangular, box ,or‘ housing 24_ to _form .aiiltering structure unit or cell which coating Ion said walls for removing dirt from air flowing through said passages, said unit consist may beused alone or of which ar number could beajssembled and arranged to form a iilter strucè, ture.. VAOther forms .and _shapes yof íilter .structures `couldreadily- be builtup by lengthsor unit pieces of thei'llter fabric. _ _ _ _ ._ _Itwilllof Vcourse _be _understood `that various Y _ details >of construction .and arrangement may be varied throughv a wide range without departing _ from .the ¿principles of thisinvention jand~ it is’V therefore not _the purpose to. limit vthe patent granted hereon. otherwise than necessitated by thescope'of the appended claims. YI_ claim as my invention;> ._ Y ' _Y Y. _' f. Y 1. .A self-_supporting air filtering unit formed with a plurality of air >passages through it having a tacky substance on the Walls of said passages ing of two outer1 sheets spaced apart and an 23 intermediatezsheet of sinuous form separating theouter sheets and deíining a plurality' of air passages through said unit, a tacky substance covering theinner surfaces .of the outerv sheets __ and the intermediatejsheet, the said sheets being of iibrous material unlike in perviousness to the . Ytacky substance, the outer sheets being impervi ous to the tacky substance to prevent the outer ysurfacesthereof from becoming sticky yand the . intermediate „sheet being porous andîpervious to. the tacky substance so that-said substance may travel therealong by capillary action through the pores of said intermediate sheet. ~ „ LLEWELLYNN J. CLARK. .