US1590688A - Liquid screen for industrial purposes - Google Patents

Description

E. HONEYMAN LIQUID SCREEN FOR INDUSTRIAL PURPOSES June 29 1926. 1,590,688

Filed'Dec. 10 192 2 Sheets-Sheet 1 June 29 1926,

E. HONEYMAN LIQUID SCREEN FOR INDUSTRIAL PURPOSES Filed Dec.

10 1924 2 Sheets-Sheet 2 III Patented June 29, 1926,.

UNITED STATES I 1,590,688 PATENT QFFICE.

EPHRAIM HONEYMAN, or MILWAUKEE, Wisconsin, ASSIGNOR no onnm nnr'r COMPANY, OFVMILWAUKEE, WISCONSIN, A oonronarron or wrsoonsriv;

LIQUID SCREEN FOR INDUSTRIAL PURPOSES.

Application filed December 10, 1924.

My invention relates to liquid screens such as are used for removing the coarser material that may be carried by liquids to be used in industrial purposes. As the use of such screens has become more common the tendency has been to increase the size of the screening or filtering units, and this in turn has imposed upon the screen much heavier duty in that the loads of material picked up by the screen and removed from the liquid are increasingly large and heavy. One of the prime requisites of a liquid screen. of this character isthat there shall .be as few open spaces as possible between the successive screening units and bet-ween these units and the stationary parts of the apparatus past which the screen units move; and that the screening surface of each unit shall be obstructed or 'cut' off as little as possible by the supports employed to unite the screen units in series and to move them.

My invention has for its object to secure both of these desirable features in a very perfect manner and to otherwise improve-the screen. V I

In the accompanying drawings Figure 1 is a. bottom plan view of a section of a screen formed of perforated sheet metal units embodying my invention.

Fig. 2 is a longitudinal sectional view taken on the line 11-11 of Fig. 1.

Fig. 8 is a transverse sectional View on the line III-III of Fig. 1.

Fig. 4 is a, longitudinal 7 similar to Fig. 2 illustrating the invention applied to a screen, the screening surfaces of the units of which are formed of woven wire material.

The screen that I illustrate consists of a series of screening units or sections A supported by a pair of parallel endless chains B, which serve to unite and impart motion to them. The screen sections illustrated in Figs. 1 to 3, and designated A, are formed of sheet metal punched as may be desired to form the screen surfaces, while those shown in Fig. hdesignated A, are formed. of stiff woven wire fabric. .For most purposes these two forms of liquid screens are the equivalents of each other.

The screen sections are secured to the opposite chains B, in a manner that will be described, and are brought together end to end as closely as is practicable for good working conditions, in order to reduce to a sectional view unit.

Serial No. 755,108.*

minimum the openspaces between them. It is well understood that the chains B work in connection with supporting and driving wheels, usually sprocket wheels the teethof which enter the open. spaces between the side bars of the links of the chains, and that around these wheels the endless moving screen passes. As the screen surface flexes in passing a supporting wheel thetendency is for the screen sections A; to separate'at their adjacent ends, and-considerable diliic-ulty has been experienced in the use of screens of this character by reason of this fact, various means having been employed to prevent or check the flow of unscreened liquid through the openings thus formed, as

.the endless screen makes itslower turn in the liquid in which it is submerged. I have largely overcome this difliculty by causing the screen sect-ions to overlap at their adjacent ends, the end of one. section being curved, as indicated at 2, on an arc the center of which is the. oint of articulation uniting the screen whose end is thus curved with the next adjacent one. Thiscauses the screen end 2 to extend below and beyond. the edge,

3, of the adjacent screen, and it is entirely.

practicable to bring these two parts very close together so the open space between them is small. The are of curvature of the part 2 is such that the flexing of the screen, while moving the curved portion 2 of one screen section relative to the edge 3 of the next screen section, does not open a joint between these sections, the curved portion being of suflicientlength to insure that its edge 4 never passes the edge 3, while the screen is making a turn.

The end of the screen section, either A or A, that is opposite the curved end 2, is bent upward and at an acute angleflto the flat main screening surface, 6, of the section, forming a lip, 5, that serves as thelifting basket with which the screening sections or units are ordinarily provided in screens of this character. The edge 3 of the section overlying the-curved portion 2 of the adjacent section, is at the apex of the angle formed by the portions 5 and 6 of the screen The lip, 5, forming the basket may be strengthened by a reinforcing strip, 7, if this be found desirable, and I prefer this arrangement when. woven wire is used to of the screen.

tween the lip and the main floor or body,

'of a screensection. They are formed of c side bars, 9, 9, connected by pins, 10, on

which may be mounted anti-friction rollers, 11. The side bars, 9, are of considerable depth so that the fiat screening surfaces, 6,

of the screen units lie a considerable distance above a plane'passing through the axes of the connecting pins, 10, when the screen is laid horizontally, as indicated in 2. The side bars of the chain links are each cut away near one end, as indicated at 12, and into the open spaces thus formed the curved ends 2 of the screen sections extend.

The screen units extend across and beyond 7 the chainsB atboth sides of the screen and the fiat portions, 6, thereof rest directly upon the upper edges of the side bars of the links. Supporting these units near their opposite ends are transverse bars, 13, which are connected with the side bars of the links by angles, 14, the upper edges ofthe cross bars being preferably in the same plane as the edges of the links to which they are connected. The cross bars, are bolted or riveted tothe angles and the latter are connected with the chains preferably by bolts and nuts, 15, The transverse bar, 13, at one end of a chain link rests against'the vertical faces orshoulders, 16, of the cut away portions of the side bars of the link, and at the opposite end the bar rests against the verti- It willbe 9 making a very rigid carrier element for the screen, and constituting good supports for the'separate units of thelat ter, which'are united to the transverse supporting bars by securing devices of any suitable character as indicated at 19. The. bars, 13, may ex tend quite to the edges of the screens, or they may terminate a little insidelof said edges as may be found desirable, but in any event they serve to support the screen sections, near theiropposite ends, practically the entire distance'from sideto side. The screen sections rest directly upon-the edges of the side bars of the chains and of the transverse bars, 13, and these are so narrow that they obstruct' but little the screening surfaces.

The longitudinal sides of the screen sections are preferably imperforate for a short distance back from each edge to strengthen the screen sections, as indicated at 18. This 5 I secure by not perforating the sheet of which the section is formed, asin the sections or units designated A, or by attaching separate strips, when the screen section is made of woven wire fabric. I

It 'willhe seen that'the side bars'of the links of the chains B are relatively deep, so

that the screening surfaces, 6, which are supported upon the upper edges of said bars, are a suilicient distance from the plane in which are included the joints of articulation of the chain, when the latter is in an extended, straight condition, to allow the extended curved portions 2 of the screen units to extend into the open spaces formed by the out away'portions 12 of theside bars. These side bars, as .well as the transverse supporting bars 13, are thin, and being disposed vertically they offer but little obstruction to the screening surfaces 6. At the same time, the arrangement shown, the transverse bars at the forward ends of the links resting against the vertical ends of the side bars of the links and the cross bars at the rear cnds'of the links resting against the vertical shoulders 16 of the links, makes a very rigid and strong articulatedsupport for the screening units.

7 What I claim is:

' 1. In 7 an articulated liquid screen, the combination of a pair of chains the links of Which are formed of relatively deep, separated, sidebars united by connecting pins, the side bars being cut away on their upper edges near one end of each link, screen units each supported by the corresponding links of the opposite chains, the

said units restingdirectly' upon the upper edges of theside bars of opposite links, and one end of each unit being curved and extended so as to be overlapped by the end of the next'adja'cent link, the said curved ends of the screen units lying in thespaces formed by cutting away the side bars of the links,'the overlapping portions of the screen units coming closetogether and the curvedportions being shapedto permit articulation of the screenf'units without openiing joints between them y 2. In an articulated .liquid screen, the combination of a pair of chains the links of which are formed of relatively'deep, separated sidebars united by connecting pins, the side bars being cut away on their upper sides near one end of each link, screen units each supported by the corresponding links of the'opposite chains and resting directly upon the upper edges thereof, one end of each unit being curved and extended so as to lie in the spaces formed by cutting away the side bars of the links next adjacent to those'to which the units are respectively seterial collected by the screens, the lastsaid ends of the screen units overlapping the curved portions of the adjacent screen units and being brought close thereto, the said curved portions being shaped to permit articulation of the screen units without opening joints between them.

3. In a liquid screen, the combination of articulated, opposite chains, screen units carried by the corresponding links of the opposite chains, the rear ends of the screen units being bent at an acute angle to the fiat screening surface to constitute lifting baskets, and braces for holding the baskets in shape.

4. In an articulated liquid screen, the combination of a pair of parallel chains each formed of separated, vertically disposed relatively deep thin side bars which are cut away on their upper edges near one end of each bar, screen units carried by the corresponding links of the opposite chains, resting directly upon the upper edges of the side bars of the chains, and vertically disposed thin transverse bars united to the chain links for supporting the screen units near their ends, the transverse bars being located in the spaces formed where the side bars are cut away and resting against vertically disposed faces of the side bars so the upper edges of the transverse bars are in the same plane as are the upper edges of the side bars of the chains the screen units resting directly upon the upper edges of the said transverse bars.

5. The combination stated in claim 4, having the transverse bars and the screen units they support extended beyond the outer side bars of the chains.

EPHRAIM HONEYMAN.

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