US1514673A - Flume screen - Google Patents

Description

G. R. RODDY FLUME SCREEN Nov. 1 1924- Filed Oct. 5, 1922 2 Sheets-Sheet 1 NOV. i 4924' j G. R. RODDY FLUME SCREEN Filed Oct. 5. 1922 2 Sheets -Sheet 2 Patented Nov. 11, 1924.

UNITED GUSTAV R. RODD'Y,'OF MILWAUKEE, :WISCONSIN, ASSIGNOR TO CHAIN BELT,1CQMPANY,

OF 'MILWAUKEE, WISCONSIN, A'GORPO'RATION OF WISCQ-NSIN.

ELU ME SCREEN.

A p1ication filed flctober 5, 1922. gSerial No. '5 92,508.

To-aZZ whom it may concern:

i Beitdrnown that l, GUSTAV :R. Ronny, a citizen of the Unitedistates, residing at Milwaukee, in the county 'or ,Milweukee land 5 State of dVi-sconsin, have invented certain :new and useful Improvements in Flume Screens, oiiwhich the following is especification.

lihis invention relates to ,fiume screens such i'asyare used; to ;.remove from sewage and waters used for industrial purposes the larger particles of solid material found therein. It has forjitsobject to improve the apparatus employed in l -such screens in such way :esto reduce {1L0 n mlnimum the leakage of water, thatis, the pessege there- .ofaroundythe screen rather than through it.

In intent 31,208,655, issued to Ghain Belt GO-mpany ,o-f xlvfilwankee, i s essignee (if-B. 2o -Reynolds da-ted {December 12, 119,116, there 1s 1 shownia wflume screen having aneny features in common with tllQmOIiB illustrated in the ieccompa-nying drawings ;;as embodying the present ,;i;nvention. ,-The -;screen shown 1n thatupatent, which is of the -end1ess, traviieling type, comprises a SGI'lBSFgOf s eparate :screen gsections rectangular in o u e zcured at :their edges to endless sprocket W chains. The dlillkSgOf {these J chains :are :each preferably formed octlpara llel spacedea part -tside zbars "JCOHDQC'EGCl at: the" o nts of 'itlle gchein i'floy pintles or crOss :pins. in the 1 usetofgsuchzSCr en 'itchasi been fou d tha a there is :some eleekege :oi (:the unscrewed .Jiquid :past: the. suhm rgedend a hc e z ve *whenzprovidedwith the means illustrated and iidescribed @iii 5 the aforesaid patent for preventing 1; such le kage .lThe sprescnt invention hasr for its ,obj ect ;to further. improve 40 the-mechanismof the screen so that? the reliaitive emountoof suchleekage ,is very much reduced.

In xtheiaccompenying drawings- 7 Figure gl is nvertical sectional View iofthe lower portion of a fiunie; screen embodying vtheimprovements.which comprise the inVen- 131011?OfiillBIiPI'BSQllh case.

Fig. i2 is as, :trensverse sectional View through 1 one of the, drive oheins and of :the parts oftheiap paretus,immediately adj acent 'tosuch:ichein, :t'eken on, the line; II+II 10f aFiigi 1.

1Fig.;:.3 ise similersectional view-taken on o the line :III-III ofFig. ,1,- and Fig. 4

another sectional view taken on the line ,I'VIViof Fig. 1.

Fig. 5 is enelevetionof the screen epperetus shown inFig. 1 paits being b li away leaving only one side of the screen and aghacent -perts of the frameworkto be illustrated.

In the accompanying drawings 2 indicates; oneof theflerge sprocket wheels sup ported in the lower endof the screen framework, 3, about which the endless screen turns,,end by which it is supported. The screen is formed ofja, series ofseparate articulated sections at, 4, connected at their opposite edges to chains 5 which engegewith pivotally united: by the pintlesor connecting pins 18, ,On which ere mounted, between the side bersfiitherollers 9. The'screen ;-se@tion 4 er sep erte by r angu a frames 12 whichiare secured at their opposite tends to the chains 5. Each self-Ben section is represented as being provided withe basket lip 10. errangedto receive onaterialthat has been co llected'by the screen section ,and which may fall therefrom as the section. leaves thesurface of thegliquid on its upward movement.

The ;;perts thus "far described ere well known in the art and-need not be here I de scribed in detail, -fOrY- aQspecific description end illustrztthm' thereof is .found in the eforesaiidf Patent 12085655.

Belowithevsprocket wheel is in curved guard :11, extending i the full width of the screen and in proximity to which the screen sections move nsthey: make their turn 2 about the sprocket wheel. This guard serves to prevent 'the'passege of unscreened liquid doelow the screen, as described in the aforesaid patent. 14,;14 represent the guards carried by the framework ,3 and 1 extending over the chains. and the: extreme. side; edges of the screen sections, and' i-between which lie thebasket lips 10, these. parts heing su-bstantiallythe sa-me as the corresponding partsillustrated in the aforesaid patent.

As has been suggested, even when the guards 14- are employed some of the unfiltered water will pass between their edges and the screen sections, when it will find free passage between the side bars 6 of the chain links above the sprocket wheels 2, thus escaping the filter or screen. In order to reduce this possibility, bars 15 are supported directly opposite the edges of the chains 5, and as close to these as good working conditions will permit. These bars are carried by the guards 14, being secured thereto by bolts 16 and held in proper position by the spacing pieces 17. It has been found in actual practice that these bars very materially reduce, the tendency of theliquid to pass around the edges of the screen, since they materially restrict and make tortuous the passage that must be followed by any liquid escaping the screen by the course indicated.

It will be seen by reference to the drawings, particularly Figs. 2 to 5, inclusive, that the guards 14 extend inward sufiiciently far to overlap slightly the screen sections as they pass, while the bars 15 are located entirely outside of the screen sections, lying opposite the outer edges of the sprocket chains 5, this arrangement permitting the bars 15 to be brought closer to the edges of the chains than it is possible-to locate the guards 14.

As will be seen by reference to Fig. 1 the sprocket teeth 7 of thewheels 2 are of a size to substantially fill the open spaces between the side bars 6 and the rollers 9. The

' lower, submerged, sprocket wheels 2 are formed with outwardly projecting flanges 21 at thebases'of the teeth 7 upon which the side bars 6 of the links of the sprocket chains may rest as they pass about said wheels. The edges of said flanges 21 may also run very close to the side walls of the boot in which the lower end of the screen is mounted, when such a boot is employed, as'is frequently the case. This arrangement practically closes the open spaces through the links after the chains engage with the wheels 2 and, since the sprocket teeth project be-- yond the outer faces of the links and run close to the inner faces of the bars 15 as the chains and screen sections make their lower turn, there is very little flow of unfiltered liquid outside the screen. i

The bars 15 extend upward on that side of the screen where the water enters sufficiently far to guard and protect the chains 5 until they engage with the track bars 20,

which are located on the inner sides ofthe chains and as close thereto as is permitted by reason of the engagement therewith of the rollers 9 of the chain. These track bars serve to prevent free transverse flow of liquid through the chain; The bars 15, from their upper ends opposite the track bars 20,

extend thence downward and under the wheels 2, concentric with the lower segments thereof, and to some convenient point on the flow side of the screen, where they are secured, as at 18, to the supporting framework. Filling blocks 19, preferably of wood, are interposed between the bars 15 and the lower guard 11.

What I claim is 1. In a flume screen of the endless, traveling type, comprising screen sections and sprocket chains to which the ends of the screen sections are secured, the combination with the submerged end of the screen and the means that cause it to make the lower turn, of means arranged to cover the lateral edges of the screen and the chains to restrict the flow of unscreened water around the side edges of the screen, and guards inside the said restricting means arranged close to and opposite the outer edges of the supporting chains arranged to restrict the passage of unfiltered water that may escape around the edges of the screen through the chains.

2. The combination stated in claim 1 having the guards secured to and supported by the said covering means.

3. In a flume screen of the endless, traveling type, the combination with supporting sprocket wheels adapted to be submerged in the liquid to be screened, sprocket chains engaging with the said wheels with open spaces through them for the teeth of the sprocket wheels such teeth being of a size to practically fill the open spaces through the chain links when the latter engage therewith and to project beyond the outer edges thereof and the sprocket wheels being formed with outwardly extending flanges across the bases of the teeth, and screen sections carried by, the chains, of guards for restricting the passage of unfiltered water that may escape around the edges of the screen through the chains, which guards are arranged opposite the outer edges of the chains on the side of the screen where the screen sections are secured, the combination with the submerged end of the screen and the lower sprocket wheels with which the chains engage, the screen sections being provided with lips for carrying upward mate-' rial taken from the liquid by the screen which may drop from the latter as they leave the liquid, of a curved guard arranged below the submerged end of the screen close t0 the inner face of which the edgeso'f the filtered Water enters around the submerged carrying lips move as the screen makes the lower end concentric With the said curved lower turn, guards arranged close to and guard, and filling blocks between the curved 10 opposite the outer edges of the chains to guard and the lower portions of the guards restrict the passage of unfiltered water for the chains.

through the chains the guards extending from the side of the screen Where the un- GUSTAV R. RODDY.

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