US1615559A

US1615559A - Screening apparatus

Info

Publication number: US1615559A
Application number: US662699A
Authority: US
Inventors: Marcus B Tark
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-09-14
Filing date: 1923-09-14
Publication date: 1927-01-25
Anticipated expiration: 1944-01-25

Description

Y Jan. z5, i927, 1,615,559

M. B. TARK SCREENING APPARATUS Filed Sept. 14, 1923 OODOOOOOOO OOOBOBOUOOOUOOOOOOQODOC 00000006000000000000000 Patented Jan. 25, 1927.'

MARCUS n. TARN, ,or PHILADELPHIA, rENNsYLvANIA.

SCREENING APPARATUS.

- Application tiled September 14, 1928. Serial No. 662,699.

The present invention relates in general to a screening medium or apparatus forrempving objects from a liquid body of that t pe in which the medium "comprises a plura ity of bars or wires stretched across the passageway of a frame adapted to be placed in the path of a moving fluid.

An important object of the invention is to so position the openings in which the elements of the screening medium are secured in the side members of the frame that the frame .will not be weakened along any particular section due to loss of material in providing for said openings.

Aeature of the invention is to provide a bowing or 'supporting member secured to the frame, the object of which is to prevent the bars or wires from moving sidewise and to keep them under tension after they are once secured in the openings in the frame.

Another object is to provide a screening medium that may be constructed in small individual units for use as a single unit or secured together to form a larger medium, for exam le, a cylindrical screening medium compose of individual segmental units joined together.

Another object is to make the screening medium so that it can be readily taken apart for changing or replacing certain elements thereof.V

Other features and objects will appear from a-detailed description of the invention which consists in the features of construction and combinations ot parts hereinafter described and claimed. v

Referring to the drawings: c

Figure 1 is an end or axial view of one unit of a cylindrical or drum screening apparatus and represents a segmental arcuate section from an apparatus composed of a plurality ot' such units secured together;

Figure 2 is a front elevational view of the unit showing the screening medium in its preferred form as a plurality ot' closely spaced bars or wires; y

Figure 3'is a vertical sectional view taken on the line of Figure 2; and

Figure 4 is a cross-sectional view taken on the line 4 4 ot' Figure 2, looking at the side of the spacing ri As shown in Figure 2, the frame of the screening apparatus is -composed of side members l and 2 and vertical supporting

members

3 and 4, with intermediate vertical supporting members 5 secured to the side members. In the preferred form of the invention, the entire frame is made of some suitable cast metal and therefore the fiance really constitutes a single casting. It is obvious, however, that the frame may be constructed of any suitable material which is capable of being machined and possesses suiiicientmechanical strength. Moreover, the frame as constructed may take any preferred shape, such as a rectangle, a circle, or as shown, a section of segmental form, such section forming only a Fractional part of the entire screening medium.Y From an examination of the drawings, it will be obvious that a number of such segmental sections are joined together to constitute a large cylindrical screenin medium. The invention does not reside in the shape that the frame may assume, but is directed principally to the elements constituting the screening medium and the method of assembling the same.

The oppositely disposed side members 1 and 2 of the frame have in the material thereof rows of staggered openings or holes l, 1b, 2, 2", that is, all of the openings in the a row of openings of both members are staggered with respect to all of the openings in the b row of openings. Furthermore, the openings in the a row of one member and those in the row of the other member should lie on the same straight line connecting any one pair of such oppositely disposed openings. The object in so placing the openings is to allow for a relatively close positioning of the screening elements without causing all of the openings to fall in the same row and thereby produce an appreciable loss ot' material in the frame, which would tend to weaken the frame decidedly along one section thereof. If all of the openings in the a. and b rows were placed in one row, the amount of material remaining between adjacent openings would be insufficient to insure a strong frame member, since there would be a marked tendency to fracture the `frame along the section comprising all of the openings. By placing the openings as disclosed, the screening elements may still be arranged in close proximity to one another without depriving the frame ot' any ot its strength along a particular section and the material remaining between adja- 'ceut openings in a particular row is greatly increased. For reducing replacement costs and for structural reasons it is also desirable to maintain the distances between the 1IL and 2b openings and the 1b and 2a openings the same. This spacing of the rows of openings should be followed consistently, regardless of the particular configuration that the frame may assume.

In the frame shown in the drawings, the openings constitute holes which are drilled through the side members 1 and 2, each member having a set of openings extending in a plane parallel to the set of openings 1n the opposite side member, one opening of each set extending parallel and in the same direction with a corresponding opening in the other set and constituting a pair of openings. This probably represents the construction wherein the reatest amount of material is lost and the .rame weakened to the greatest extent. The openings may only be cavities situated in the side members, but regardless of the form that they may assume it will be readily seen that holes bored through the side members will produce an extreme case, considered structurally.

A supporting member or rib 6 is secured to the frame and extends across the passageway of the frame intermediate the slde members 1 and 2. This rib is shown as being parallel to the members 1 and 2 and may be secured mechanically to the frame or cast integrally therewith. The latter construction is preferred and is therefore shown in the drawings. This rib is of a substantial thickness and projects from the frame at right angles with the supporting

members

3, 4 and 5 and to a considerable distance beyond the surfaces of the side members 1 and 2. If a plane included the faces of the side members l and 2 it would not include the face of the rib 6, but would intercept the latter. The relative distance which the rib 6 projects beyond the faces of the side members 1 and 2 may be clearly seen by referring to Figure 4.

The face 7 of the rib which is opposite to that face in contact with the frame has a plurality of equally spaced notches or slots 8 extending transversely thereof and to a substantial depth into said rib, the walls of said notches or slots being parallel to each other. 'The number of such notches or slots should correspond with the total number of openings in t e rows a and b and should be in substantial alignment with the openings, that is, each of the notches lie in a line connecting the alternate opposite openings and the bottoms of the notches lie at a point out of alignment with a line connecting the surfaces of the side frame members in which the openings are located.

The screening medium comprises bars or wires 9 stretched across the passageway in the frame and secured in the staggered openings. Each bar or wire is cut to the same length and the opposite ends thereof are bent so as to extend substantially parallel to each other so that the ends may project into the staggered openings. In forming the bars or wires the length between the bent portions thereof is slightly less than the distance between any two opposite openings, that is, if a bar is to be inserted in the 1 and 2b o enings, the distances between the arallel ent portions will be slightly less t an the distance between such openings. The same construction will appl to a bar or wire to be inserted in the lb an 2 openings. Therefore, the screening elements can all be made according to the same dimensions since the distances between the openings measured across the passageway are the same throughout.

In stretching the screening elements, the bent portions are forced into the proper openings and the intermediate portion of the element will rest in the notch or slot corresponding to the openings. Since the rib 6 projects above the side members 1 and 2, the effect that it will produce, upon the screening element when placed in one of the notches on the rib, will be one of bowing or flexing. Moreover, since the bent portions are forced or driven into the openings, the result will be that the elements are placed under tension and the bowing feature adds somewhat to the tension set up in the bar or wire. any possible sidewise movement of the bars and consequently each element will fit in only one pair of openings and the corresponding notch. A ter the bent portions of the bars are resting in the openings they may be secured therein by mutilating the ends or any other means well known in the art.

From the above description it will be apparent that the screen presents a very smooth even surface to the material to be filtered and the elements are not apt to be Veasily bent out of shape or damaged. The

screening medium also possesses the very desirable feature of ease in replacing an element without in any way interfering with any other element, and since each element is of the same dimensions only one type of bar or wire need be carried in stock.

I claim:

1. Screening apparatus comprising a frame, the two side members of which have a plurality of staggered openings therein, a bowing member supported by said frame intermediate of said side members and having a plurality of notches therein, the walls of said notches being parallel and each of said notches lying in a line connecting said alternate opposite o enings, and a screening medium on said ame comprising a plurality of bars lying alongside of each other and resting in said notches and secured in said openings.

2. Screening apparatus comprising a The notches also serve t`o prevent frame, the two side members of which have a plurality of staggered openings therein2 a bown member supported b said frame 1ntermeiate of said slde mem rs and having a plurality of notches therein, the Walls of said notches being parallel and each of said notches lying in aline connecting said alternate opposite'openings, the bottoms of said notches lying at a pomt out of alignment with a line connecting the surfaces of said l0 side yframe members in which said openings are located, and a screening medium on said frame comprising a plurallty of bars lying alongside of each other and resting in said notches and secured in said openings. 15 In testimony whereofI I aix my signature.

MARCUS B. TARKr