US2604989A - Screen - Google Patents

Description

July 29, 1952 WARHQL 2,604,989

SCREEN Filed Dec. 29, 1948 ATTOR NE Patented July 29, 1952 SCREEN Peter Warhol, Minnea Company, Minne's0ta Application December 29, 1948, Serial No. 67,786 I 6 Claims; crate-#401) polis, Minn, assignor, 'by; mesne assignments, to Midland Engineering St Paul, Minn a corporation of This invention relates to screens for, general use in grading and sizing either loose or suspended materials or particles and particularly to a screen having a number of advantages resulting from a novel arrangement of sinuous or wave form wires defining the openings of predetermined size for the passage of material between adjacent wires.

It is an object of my invention to-provide a screen having improved resistance to both wear and, blinding as a result of a novel arrangement and form of coplanar wires connected together at suitable intervals.

A further and particular object is to provide a screen of the class described having high screen efficiency by reason of a diagonal disposition of either substantially square or diamond shaped openings in relation to the direction of movement of the material along the face of the screen. Other objects will appear and be more fully pointedoutin the following specification and claims.- I V Referring to the accompanying drawing which illustrates my invention by way of example and not for thepurpose of'limitationz Figural is a plan view showing a fragmentary portion of a screen embodying my invention and wherein the sinuous wires are connected together at suitable intervals by groups of cross woven wires;

Fig. 2 is a section taken on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary plan-view showing an alternate form of fastening members for connecting the sinuous or wave form wires together, and

Fig.4 is a cross section taken on the line 44 of Fig. 3.

In the drawing, the numeral 6 indicates a multiplicity of similar wires of sinuous, undulated or'wave form disposed substantially in a common plane. Each of these wires hasa succession of substantially straight portions connected together by oppositely bent portions. Openings 7 through which the material to be screened may pass are defined by adjoining wires 6 which have the convex sides 8 of their bent portionsin close proximity or substantially in contact, one with another. As shown, substantially square openings l are formed by approximately right angular bends in the wires 6 and the openings are diagonally disposed relative to the sides and ends of the screen. 7

In Figs. 1 and 2 groups of cross wires 9 are shown interwoven with the wires 6 at suitable intervals to connect the wires"6'. itogetherjasTa strong screenfabric. l The several groups vo'flwire's 9 are spaced longitudinally of the 'vl'liresfli at intervals greater than the lengthof thefs'everal openings 7 and to leave a plu'rality "o'fjthe'jopenings l in each row open ahdunobstructed between adjacent groups of fastening wires 9;For some purposes it may be desirable to spot weld or otherwise fasten the cross wires 9"to the several sinuous wires 6. As illustrated,flthere'are five unobstructed openings 1 in each row between adjacent groups ofwires '9, but it will be understood that these groups of wires or other cross ties may be otherwise spaced along the wiresjfi, as required to impart adequate strength to*the screen fabric. The wires 9 are formed and arranged to retain the wires .6 side by side sub-- stantially in a common plane and with, the reaches of the wires 6 between groups oflwires 9 free to vibrate individually. 2

For the alternate formof' the invention shown in Figs. 3 and 4, narrow metal bands I0',e2 t d ing crosswise, are welded or otherwise Jr dly secured at suitable intervals to the several' wires 6. These bands may be extended across-the front and back surfaces of the wires 6, in pairs} with the wires 6 between the bands 10; of eachpalr, as shown in Fig. 4, or 'th e bands-l0 may be spaced along the wires '6 and secured to one" face thereof only. They are preferablyspot'jwelded the wires 6 at suitable points,- e: g.-at' the contacting points of the angularly bent portions of the wires '6 along thelnedian lineof each band 10 and/or v at points along? the margins "of the bands l0. By this arrangement' of fastening members the several wires 6 aresecurely'held insubetantially a common plane and there isa minimum ofobstruction to thepass'age-of undr size particles of the material being "treated through the openings- 1. v

In use,fthe screen is-preferablyarranged so that the material'to be screened-is passe }in a general direction longitudinally of the -w'r'es B and across the fastening members -9'-or that the material moves in a direction diag' to the substantially rectangular openings 1; The wires 6 may beheld under tension longitudinally by suitable means wellknown in-tlii'sart'and tlie natural resiliency of the -individual'-' wiresand tension therein tends to cause the'wires' li' to be spaced one from another slightly at the' convex sides 8 of the several angular bent por tions, This allows each-wire 6 to vibrate laterally in the plane of thescreen as well as perpen' dlcularly thereto along the reaches of these substantially uniform direction of movement of the material along the screen, screen efiiciencies are improved. Emn ciency is further improved by reason of my coplanar arrangement of the sinuous wires 6. The angle of the bend of these wires may be varied depending on the slope or pitch of the screen surface. 1 For example, where the screen is to be used at a fairly steep incline, degree of bend of the several bent portions may be made somewhat obtuse to thereby aiford diamond shaped openings having their longer diagonals extending longitudinally of the direction'ofmovernent of the materialover the screen Su a e" V Unusualresis'tance to wear is obtained by my provision of a minimum number of members extending across and'projecting above the screen surface defined by the coplanar sinuous wires 6." It will'b'e evident that my improved screen may be furnished in a wide range of sizes, haviris openings corresponding generally to the range 9f; sizes afforded by conventional woven wire screens for the grading and sizing, of minerals and other materials in either dry state or in suspension in a liquid. While the sinuous members defining either substantially square or diamond shaped openings are preferred, it is feasible to eliminate the straight portions of the wires by forming each or" them with a succession of substantially semicircular bends. of alternately opposite curvature where substantially circular openings are prefef f' ving described'myinvention, what I-claim as new and desire to. protect by Letters fEatent is: A scr en compris n em l p i i Simi- .1 s;Wires i s su fiam all n a o m n pl nea d efin n o n o t e; ass g of material, each; o f said wires having a succession bizte nat ng pnqsi v P a eas e vex sides of -which are disposed closely adjacent to th con exdes-91 th? adie n wires i6 or for the passageandsizin g'of material and fastenen each i e .-:and h; 9 he 1 sse t wires a row of substantially separate openings ing means connecting said wiresto'gether at alt t n 9 1Y P6 1? um an con x d svf the nt p onsa ia beinedi pos g clo e Pro i y 6 t another, whereby a row of substantially separate .betva-a iate t openings are formed between each wire and each at h ad a ent w r s nd mea n ne d wires together at intervals spaced longitudinally her o .7 a

,. 3. A screen comprising, a multiplicity of sinuous'wires disposed substantially in a common plane nd. defining openings of predetermined size for the passage of the angle. or

intervals: spaced longitudinally m teor to leaye 4 material, each of said wires having substantially straight portions alternating with oppositely bent portions, the convex sides of the several bent portions of each wire being disposed in close proximity to the convex sides of the adjacent wires to substantially separate the several openings between-wires and means connecting said wires together at intervals spaced longitudinally thereof to leave unobstructed for the passage of material therethrough a multiplicity of said openings between adjacent connecting means.

4. A screen comprising, a multiplicity of sinuous wires having substantially straight portions connected by angularly bent portions, lying substantially in a common plane and defining substantially'rectangular openings diagonally disposed to the direction of travel of material along the screen, the convex sides of the several bent portions of each of said wires being disposed closely adjacent to the convex sides of the adjacent wires to substantially separate the several openings formed by said wires and means connecting said wires together laterally.

5. A screen comprising, a multiplicity of sinuous wires lying substantially in a common plane and forming openings for the passage of material between adjacent wires, each of saidwires having a succession of alternating, oppositely bent portions the convex sides of which are disposed closely adjacent to the convex sides of the adjacent wires to form between each wire and" each of the adjacent wires a row of substantially separate openings for the passage and sizing of material and groups of cross wires interwoven with said sinuous wires and connecting them together laterally at intervals spaced longitudinally of the sinuous wires distances greater than the longitudinal dimension of the severalopenings.

6. A screen comprising, a multiplicity of sinuous wires lying substantially in a common plane and forming openings of predetermined size and shape for the passage of material between adjacent wires, each of said wires having a succession of alternating, oppositely bent portions the convex sides of which are disposed closely-adj cent to the convex sides of the adjacent wires to form between each wire and each of the adjacent wires a row of substantially separate openings for the passage and sizing of material and substantially fiat fastening members extending across opposite surfaces of said wires and'con nesting them togetherlater'ally at intervals spaced longitudinally of the" sinuous wires distances greater than the longitudinal dimension ofthe several openings.

' PETER WARHQL.

REFERENCES crrnn The following references are of record'i-nthe file ofthis patent:

UNITED STATES PATENTS

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