US1208655A - Flume-screen. - Google Patents

Description

B. S. REYNOLDS.

l PLUME SCREEN. APLICATION FILED OCT. 4, 1,916'.

B. S. REYNOLDS.

FLUME SCREEN.

APPLlcATxoN FILED ocT. 4. 1916.

1,208,655. Patented Dec. 12,1916.

, 3 SHEETS-SHEET Z B. s. REYNOLDS.

PLUME SCREEN.

APPLICATION FILED 0CT.4, 1916.

Patented Dec. 12, 19111.

3 SHEETSSHET 3 II II i l FIE..

:BENJAMIN S. REYNOLDS, 0F MILWAUKEE, WISCONSIN,v ASSIGNOR TO CHAIN'A BELT COMPANY, 0F MILWAUKEE, WISCONSIN, A CORPORATION 0F WISCONSIN.

FLUME-SCREEN.

To all whom t may concern:

yBe it known that I, BENJAMIN S. REY- NoLDs, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in for its object to improve the apparatus and the screens constituting` parts of the apparatus, in the manner to be hereinafter pointed out. 1 In the accompanying drawings-Figure 1 is a vertical sectional view of apparatus constructed according: to my present. improvements. Fig. 2 is a vplan view of the installation shown in Fig.1. Fig. 3` is an elevation of a portion of a flume screen drawn on a larger scale than Fig. 1 in Iorder to illustrate certain of the improvements. Fig. 4 is a transverse sectional view taken on the line IV-IV -of Fig. 3. Fig. 5 is a longitudinal. sectional view taken on the line V-V of Fig. 3. Fig. 6 is a longitudinal sectional view illustrating a feature of the improvement 4not shown in any of the other views. Fig. 7 is a vertical sectional View of` the lower portion of the screen and the guard that is associated therewith when-the screen is let down to its lowermost position.

In my Patent No. 1,191,115, dated July 11,

. 4 1916, I'show-a vertically adjustable water screening apparatus supported adjacent to a wall in whlch are formed two openings,

- through the lower of which thewater to be screened passes when the water in the streamis low, and through the upper of which the water to be screened passes; when the water is high; an adjustable gate for closing one or the other of the openings at will; andv means for vertically adjusting the screening apparatus as a whole to bring it into operative position relative to the uncovered opening.

It is sometimes desirable to employ a Aver-- tically'adjustable screen, such as shown in myl aforesaid patent, where the wall separating'the stream from whichthe water is taken from the chamber in which the screen is located has but a single communicating Specification of Letters Patent.

Patented Dec. 12, 1916.

' Application mea october 4, 191e. seriai No. 123,692.

opening, as for instance when a short, vertically adjustable screen, such as my invention permits the use of, is set up in a chamber that might have been originally constructed to receive screening apparatus of a different type. My said patent shows the screen supported close against the face of the wall in which is located the two openings. If, however, the screen be located some distance back from the wall a single opening arranged through the wall at a low level may be sufficient, as 'I will now explain.

Referring to Figs. 1 and 2, 13 indicates a I Wall separatingl the chamber 14 in which the screen is located, from the stream from whlch water isv taken and delivered in purified condition to the plant, through the intake conduit 15. In the lower portion of the wall 13 there is a communicating opening 16 between the stream and the chamber 14. The screen, indicated as a whole by 17, is

similar to that described and illustrated in my aforesaid patent, and 'hence need not be herein described in detail. Suice it to say it is of the endless automatically cleaned flume screen type, having articulated screen sections united by chains which pass about upper and lower wheels 18 suitably supported in the rigid screen framework 19. The screen is relatively short between the turning wheels, and is vertically adjustable within the chamber 14 as described in my aforesaid patent. Vertical guides 2O direct the up and down movements of the screen as a whole and may also serve as the means for preventing water from passing between the vertical sides of the screen and the side walls of the chamber 14. Means for vertically adjusting the screen are not shown in detail, being typiiedby the hoisting cables 21, one of which appears in Fig. 1.` Neither are the means by which the endless screen is moved, nor the means for cleaning the sections of the screen, illustrated, as these are well known in the Vart and form no feature of the present invention. 4

22 indicates a vertically adjustable gate; 23, guides by which its vertical movements are controlled and directed; and 24 alscrew rod by which it may be moved up and down. This gate is of approximately the same width' as the screen 17 and is ofa height corresponding-with the distance to which it maybe desired to move the screen upward from its lowermost working position.

At'lowstages of water in the stream the screen is let down to the bottom of the chamber 14 and the gate is raised, the water then 1 taking a comparatively straight course from the stream,through the opening 16,the chamber 111, where it is screened, Iand into the conduit leading to the plant where the water is to be used. When the -water in the stream rises-to such a height as'to make it impracticable to use the parts when in the position just described, the screen is lifted intov the position indicated in Fig. 1, and the gate 22 is lowered to close the space between the bottom of theV screen and the bottom of the chamber4 14. The water is now caused to take the tortuous path indicated by the ar- .rows in Fig. 1. To permit the water to pass freely along the course just indicated it is necessaryE that the screen shall be set back from the wall 13 suifciently far to provide a free passage between the wall and the screen for the volume of water that the v screen will treat.

i The guides 23 may be on either side of the screen; or two sets of guides may be used as shown in the drawings, one on each side of the screen. It is largely immaterial whether ,one set or the other of these guides is used, or whether both sets are used, two` .chains pass 'around and engage with the wheels 18. 'The frames' for the separate screens are supported so as t6 come together edge to edge, as near as may be, and the spaces between them are covered, when the screen sections are -in working position, by strips 5. The chains 4 preferably carry rollers G that are adapted to run upon tracks 7, such as formed-by the angle irons shown in the` drawings. As in use the screen is usually arranged vertically or at a steep angle, I employ lips9 to catch the material that may be separated by the screens and which when lifted above the surface of the water would fall backward and downward from the screen surfaces, and hence would not be carried ol, were conveying means like the `lips 9 not employed to catch and carry it. These lips are disposed at an angle to the surfaces of the screens 2 and are preferably secured to the lower transverse edges of the frames 3 of the up-moving sec' 'tions 2.

In order to prevent material that is floating or suspended in the stream, from passing around the side 'edges of the screen, I

providethe guards 8. These, preferably, are plates secured to the screen framework 19 and` parallel with and overlying the tracks 7,'and at such distance therefrom as to be as close to the upper edgesof the screen frames 3 as is practicable and yet permit the freemovements of the working parts.

The guards extend inwardly sufficiently far to 'overlie the side edges of the screen sections at all times. Experience has demonstrated that in operating flume screens of the character illustrated and described herein there must be a certain amount of clearance between the outer ends of the pintles 10 that unite the links of the chains 4:, and the supporting portions or flanges 11 of the' guards 8, as it is practically impossible to make 'a screen that will run easily without allowing it a certain amount of side or transverse f iexure. The guards must therefore loverlie the screen sections sufliciently to completely cover their edges should the .screen move laterally tQward either side to the maximum extent permitted. In order that the lips l9 shall clear the edges of the guards 8 as the screen shifts sidewise during use, these lips are made of less width than the transverse dimensions `ofthe screen, that is, they are cut away at their ends so as to leave a'certai'n amount of clearance between them and the edges of the guards 8, as indicated at 12.

By the arrangement described and illustrated I am enabled to bring the guards 8 so close to the screen that they operate effectivelyto prevent any material that the screen is supposed to remove from passing 'around the edges of the screen, thus over- It sometimes becomes necessary to stiien l the traveling screen transversely, particularly where the screensections are wide, and for this purpose I prefer to employ transverse rods 27 -between the chains 4, locating such rods between the ends of certain of the 'screen sections 2 as represented in Fig. 6.

While this arrangement operates to separate the lscreen sections between which the rods pass, I utilize these rods to fill, as nearly as is practical, the spaces between the sections, mounting them concentric with thel axes of articulation of the screen sections and the chains. If desired 'a filling tube 28 may be n agences I mounted upon the rod 27. rll.`he rod 27, or the rod and the tube 28 together, will operate to prevent. solid material passing between the screen sections, and it has been foundthat the joints may in this way be made so close that the strips 5 may be dispensed with.

Under certain conditions it is found desirable to interpose between the' lower end should be of sufficient length .to insure that under all .circumstances at least'. one of theprojecting` lips 9 is in proximity to its. inner curved face (although it may beso long that several of the lips are simultaneously traveling adjacent thereto as represented in yllig. 7), so that while more or less water may pass the lower end of the screen no solid material oic harmful sizewill be allowed to pass.

The several improvements presented .in'

this case have been devised to meet practical difliculties' met with in operating water screening apparatus, and are effective for the purposes for which they are intended, and at the same timeadd but little to the cost of the apparatus. t

What I claim is:-

l. ln a water screening apparatus, a water chamber separated from the stream from which the water supply is taken by a wall, inthe lower portion of which is an opening, a vertically adjustable water screen mounted in the chamber at ay distance back from the wall sufficient to permit a free flow of water between the screen and the wall, and a gate for closing the space between the bottom of the screen and the bottom of the chamber arrangedto deflect the water upward to cause it-to pass through the screen when the latter is raised and the gate loweredn '2. The combination with an endless traveling fiume screen provided with transverse lips for lifting material taken out of the water by the screen, of means arranged to cover the lateral edges or" the screen arranged to prevent material which the screen is intended to separate from passing beyond the said lateral edges, the said lifting lips being shorter than the transverse dimensions of the screen, whereby they lie between the edges of the said covering means.

3. The combination with an endless travcling fiume screen formed of separate screen sections connected at their edges to chains, and provided with transverse lips for lifting the material taken ont oic the-water by the' screen, of guard plates overlying the lateral edges 'ot the screen and disposed close to the outer edges thereof, the said lifting lips being shorter than the transverse dimensionsof the screen and than the distance between the edges ot the opposite guard plates, whereby limited lateral ilexure or' the screen is permitted.

4. rEhe combination with an endless traveling flume screen formed of articulated sections, of guards arranged tooverlie the lat-v eral edges of the-screen and disposed close thereto, transverse lips for lifting material taken out otthe water by the screen, the lifting lips being shorter than the transverse dimensions of the'screen and than the distance between the opposite edges of the guards, and strips arranged to overlie the spaces between contiguous screens secured to the said lips and also shorter'than the distance between the guards.

5. ln a flume screen, thecombination of a series of separate screen sections, chainsat the side edges of the screen to the links of which the screensections are united, and

cross bars uniting theV opposite chains and passing'between *adjacent screen sections,

the cross bars being proportioned to the space between the screen sections which they separate as set forth, whereby they substantially till the spaces between the ends of the sections and operate to prevent solid material that may be carried by the water passing between the said sections and hence escaping thescre'en.

BENJAMN l. REYNOLDS.

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