US2271900A - Screen - Google Patents

Description

Feb. 3, 1942.l R. MowBRAY SCREEN v Filed Jan. 31, 1959 III,

ATTORNEYS Patented Feb. 3, 1942 SCREEN Robert E. Lee Mowbray, Cambridge, Md., assigner to The Cambridge Wire Cloth Company, Cambridge, Md., a corporation of Maryland Application January 31, 1939, Serialv No. 253,910

Claims.

My invention relates to shaker screens and the like, and has among its objects and advantages the provision of improved binding means-secured to certain margins of the Wire mesh and fashioned for connection with tensioning means.

Shaker screens and various other types of screens employed for mechanical separation purposes are provided with binding means which usually extend along two margins of the wire cloth. Such binding means usually includes a hook-like formation for connection with an angle or other frame means for imparting the necessary tautness to the wire cloth. `Such binding means usually comprises `plate elements located on opposite faces of the enclosed screen margin with the parts secured into a unitary structure by spot welding. Cushioning strips are posiare made secure by being clamped against thel wire mesh when the plate elements and the mesh margin are welded into connected relation. In many cases the plate elements are fashioned from sheet metal bent back upon itself to provide the elements between which the margin of the screen is positioned. Two individual plates have also been employed. In all cases the plate elements and the screen margin are secured into a unitary structure and subsequently 4bent as a unit to provide a hook for connection with the tensioning frame.

In bending the binding and the screen itself to hook formation encounters many limitations, such as allowable thickness of the plate elements making up the binding, weight or thickness of the enclosed screen, and the impossibility of bending such a combination of plate elements and screen to the predetermined and exact fitting measurements essential to long screen life. Diniculties encountered in connection with conventional methods of fabricating screen bindings have been found to be responsible for much screen failure. Screen life can be assured only through a perfect fit between the hook and the tensioning member associated therewith, as Well as an intact and undisturbed weld job between the plate elements and the screen margin. Bending of the binding to hook formation frequently disrupts welded connections and causes relative displacement of the plate elements in such degree as to impair the wire cloth. In addition, it is essential that the offset margins of the plate elements maintain parallel relation with thescreen cloth sov as to effectively hold the cushioning strips in pressure relation with the enclosed screen margin. The resulting wedgeshaped opening between the offset margins 'of the plate elements permits entrance of foreign materials and greatly acceleratesA the impairment and destruction of the screen cloth.

Accordingly, an object of my invention is to provide a screen of the type described embodying a binding means for the margins of the wire mesh, which binding means comprises at least two plates between which the margin of the wire mesh is effectively clamped through welding of the parts into a unitary structure, with the plates preformed to have exact intertting relation to provide a hook for connection with a tensioning member. The plates are also preformed to provide offset margins 'between which and the wire mesh I position cushion strips, which are related in such manner as to provide two'offset general lines of bend in the wire mesh adjacent the binding means.

Another object 'is to provide a screen of the type described hin which the wire mesh is maintained under tension through the medium of an adjustable frame, wherein the wire mesh is provided with binding means along certain margins made up of plates preformed to provide hook formations for connection with the frame and in which said margins of the wire mesh are located between the plates and the parts welded into a unitary structure. l

A further object is to provide a screen of the type described in which the margins of the wire mesh are effectively clamped between two metallic plates with at leas-t one of the plates bent to provide ahook for connection` with a supporting and tensioning frame and in which the parts are preformed, assembled and subsequently welded into a unitary structure with the margin of the wire mesh secured between the plate elements.

A further object is to provide a novel method.

of fabricating al screen marginal binding so as -to effectively anchor the margin to the binding,

heavier gauge metal than is used in commonk practice. The thickness or weight of the screen is not limited as itis separately bent to shape to conform to the definite preformed contours of the plates.

In the accompanying drawing:

Figure l is a plan view of a screen embodying my invention;

Figure 2 is an enlarged sectional perspective view of one of the tensioning members illustrating the manner in which-the margins of the wire mesh are made secure;

Figure 3 is a perspective view of the structure illustrated in Figure 2 with the parts separated for the purpose of illustration;

Figure 4 is a view similar to Figure 2 illustrating a modilcation;

Figure 5 is a view similar to Figure 4 but illustrating a further modification; and

Figure 6 is a view similar to Figure 5 but illustrating a further modified form of fastening means.

In the embodiment selected to illustrate my invention, I make use of a screen supporting and tensioning frame I8, which includes side members I2 and end members I4 each of which may comprise angles. Both side members I2 are provided with threaded sockets I6 for connection with rods I8 oppositely threaded at their ends so that the side members I2 may be adjusted toward and away from each other through rotation of the rods. Both end members I4 are so related to the side members I2 as to permit relative shifting of the side members. Figure 2 illustrates one of the side members I2 in cross section, which member has its flange 26 lying in a horizontal plane and the flange 22 lying in a vertical plane, the latter flange serving as a mount for the sockets I6 associated with that side of the frame.

The wire mesh 24 of Figure 1 is mounted on the frame I0 and is maintained under tension through the medium of the tension rods I8. Each side margin of the screen 24 is fastened throughout its entire length to binding means 25 which has hooked connection with one of the side members I2. Figure 2 illustrates one of the binding means in cross section in combination with one of the frame members I 2. According to Figures 2 and 3, I make use vof two preformed metallic plates 26 and 28 which are located on opposite sides of the margin 38 of the Wire mesh 24.

Plate 26 is bent at 32 to provide a right-angular ilange 34 bent at 36 to-provide a flange 38 arranged at an acute angle to the area 48 of the plate 26. Plate 28 is bent at 42 to provide a flange 44 paralleling the flange 34. Flange 44 is bent at 46 to provide a flange 48 arranged at an angle to the area 58 of the plate 28 corresponding to the angularity between the ilange 38 and the area 48 of the plate 26. I bend the flange 48 back upon itself at 52 to provideva hook 54 within which the outer margin of the flange 38 is positioned when the two plates are assembled, see Figure 2. p

The area 46 of the plate 26 is offset outwardly 58, as at 68 and 10, respectively, see Figure 2. Between the portion 68 and the margin 30 I interpose a cushion 12 which may comprise a rubber strip. A cushion 14 is interposed between the portion 'I0 of the wire mesh 66 and the margin 38, which cushion may also comprise a rubber strip. Referring to Figure 2, it will be noted that the cushion 'I2 extends beyond the edge 16 of the offset flange 56 and that the cushion 'I4 extends beyond the edge 18 of the offset llange 58.

Figure 3 illustrates the parts of Figure 2 preparatory to assembling the parts into a unitary structure. The cushion 'I2 is stapled at 8U to the mesh 64 at suitable intervals for holding the parts in assembled relation and true alignment. Cushion 14 is stapled at 82 to the mesh 66 at suitable intervals for connecting the parts in asn sembled relation and proper alignment. Mesh 66 to provide a flange 56 which parallels therarea 40.

Similarly, the area 50 of the plate 28 is offset outwardly to provide a flange 58 which parallels the area 58. Margin 38 of the wire mesh 24 is preformed to provide a run 60 located between the flanges 34 and 44 and a run 62 located between the flanges 38 and 48, with the edge of the run 62 lying close to the bight of the hook 52. Between the areas 48 and 58 and the margin 30 I position strips of wire mesh 64 and 66, each of which has one edge terminating at the flange 34.

partly underneath their respective ilanges 56 and is then placed in position on the area 50 with the cushion 'I4 lying upon the flange 58. Mesh 24 is then positioned with its margin 30 lying on the mesh 66 and its runs 68 and 62 embracing the flanges 44 and 48 of the plate 28. Mesh 64 is assembled with the plate 2'6 with the cushion I2 lying underneath the flange 56, after which the plate 26 is placed in position with its flanges 34 and 38 embracing the runs 60 and 62 of the margin 38. Plate 26 is then adjusted to position and all the parts are connected into a unitary structure by spot Welding 84 at suitable intervals. The runs 68 and 62 of the margin 30 are pressed between the flanges 34 and 38 of the plate 26 and the flanges 44 and 48 of the plate 28. The margin 30 is tightly clamped between the two strips of mesh 64 and 66 throughout its entire length so as to be securely fastened. Wires B6 of the mesh 24 are arranged at right angles to the side members I2. These wires are placed under tension through adjustment of the rods I8 and the screen unit is effectively connected with the side members through tensioning of the mesh 24. Figure 2 illustrates the area 58 and the flanges 44 and 48 as defining a hook 88 which hooks over the flange 20 of the frame member I2. Adjustment of the rods I8 will press the edges of the flanges 20 against the bights of the hooks 88 so as to effectively secure the mesh 24 to the frame members I2.

In operation, the screen is vibrated in the usual manner, which causes the mesh 24 to bend along.

lines vclosely adjacent the side members I2. Figure 2 illustrates the cushions 'l2 and 14 as extending beyond the flanges 56 and 58 so as to protect the mesh 24 from direct engagement with the flanges. Cushions 12 and 14 are pressed gently between the flanges 56 and' 58 and the cushions are of such widths as to have cushioning relation with a considerable area of the mesh 24. Bending the mesh 24 downwardly, when viewing Figure 2, will locate the line of bend along the edge 'I8 of the llange 58 with the projecting margin of the cushion bending along the line of the edge 18. However, cushion 'I2 is of such thickness and resiliency as to yield effectively to any bending action of the mesh 24 so that the latter will bend gently throughout an arc of considerable length. Similarly, bending the mesh 24 upwardlywill flex the cushion 'I2 upwardly about the edge 16, with the general line of bend located to one side of the line of bend determined by the flange 58. Thus the mesh 24 will bend generally along two spaced lines so that the bending action imparted to the mesh is distributed Lthroughout a larger area of the mesh along two general lines, thus prolonging the life of the mesh.

The two strips of mesh 64 and 66 constitute effective binder means when clamped between the plates 26 and 28 so that the margin 30 is effectively secured throughout the entire overlapping areas of the plates 26 and 28. Cushions 12 and 14 eliminate all metallic contact between the flanges 56 and 58 so that any bending action imparted to the mesh 24 is localized within and about the cushions 12 and 14. In View of the effective anchorage of the margins 30, the mesh 24 may be placed under any necessary tension without any danger of rupturing the mesh or impairing its anchored margins.

In assembling the parts of Figure 3, the mesh strips 64 and 66 may be spot welded at 90 to their respective areas 40 and 50 to facilitate assembly of the parts. After assembly, the parts will be spot welded as indicated at 84 in Figure 2.

In my invention, margin 30 issecurely fastened while the cushioning means is located between the rm anchorage for the margin and the body of the mesh 24. The cushioning means are of such width as to cushion the flexing area of the mesh 24 between the plates 26 and 28 so that bending of the mesh occurs in advance of the fixed connection between the mesh and the plates.

A11 the parts of Figure 3 are preformed in every detail before assembly so that the parts will have close and exact interfitting relation. The margins of the wire cloth are effectively secured through spot welding of the parts, and the screen is anchored in the binding means in such manner as to be uniformly tensioned throughout its full length. Preforming of all the parts permits much heavier sheet material to be utilized and no difficulty is experienced in forming heavy wire cloth. Flanges 56 and 58 are preformed to have true parallel relation so as to maintain the cushioning strips 12 and 14 in effective pressure relation with the wire mesh so as to insure uniform cushioning for the screen in addition to maintaining a sealed condition which prevents the entrance of foreign material.

Figure 4 illustrates a construction identical with that illustrated in Figure 2 with the exception that the flange 92 corresponding to the flange 48 terminates at 94 flush with the edge 96 of the flange 98 corresponding to the flange 38. ll the parts of Figure 4 are preformed. Figure 5 illustrates plates and |02 of widths slightly greater than the flange |04 of the angle |06 corresponding to the angle 22. Plate |02 is flanged upwardly at |08 to terminate flush with the upper face of the plate |00. In other rpects the mesh 24 is clamped between the plates |00 and |02 in the same manner as illustrated in Figure 2, and the parts are preformed to shape. These plates are spot welded at suitable intervals I0, and the plates, together with the screen wire therebetween, are provided with openings |I2 at suitable intervals for the reception of bolts ||4 which extend through openings in the flange |04 for bolting the mesh to the angle. In Figure 4, the mesh is connected with the angle through a hooked connection in the manner of Figure 2.

In Figure 6, the plate ||6 is provided with a hook ||8 corresponding to the hook on the plate 28. The plate |20 is bent to provide a downwardly extending flange |22 partly overlapping the hook H8. The mesh 24 is positioned between the plates ||6 and |20 and the margin of the screen is anchored through spot welding |24. Plates ||6 and |20 have their edges |26 and |28, respectively, offset in the same manner as the edges 16 and 18 of Figure 2. All the forms anchor the mesh 24 in such manner as to provide offset lines of bend for the mesh.

Without; further elaboration, the foregoing will so fully illustrate my invention that others may, by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim:

1. Screen fastening means comprising metal plates fitting a margin of a wire screen, said metal plates being disposed on opposite sides of said margin and having contacting engagement therewith, said metal plates and said margin being spot welded into a unitary structure, said metal plates having offset margins, and cushioning means between said offset margins and said screen adjacent the screening area thereof.

2. Screen fastening means comprising metal plates fitting a margin of a wire screen, said metal plates being disposed on opposite sides of said margin and having contacting engagement therewith, said metal plates and said margin being spot welded into a unitary structure, said metal plates having offset margins, and cushioning means between said offset margins and said screen adjacent the screening area thereof, at least one of said metal plates being fashioned to provide a tensioning hook.

3. Screen fastening means comprising metal plates fitting in contacting engagement with the opposite sides of a correspondingly shaped margin of a wire screen, at least one of said metal plates being fashioned to provide a tensioning hook, said metal plates and said margin being welded into a unitary structure, said metal plates having offset flanges adjacent the screening area of said screen, and cushioning means between said offset flanges and said wire screen, said offset flanges on one side of the screen being relatively offset from the flanges on the other side of the screen in the plane of said screening area to provide two general lines of bend for the wire 4. The combination of a screening mesh, plates on opposite sides of a margin of thel screening mesh, said plates fitting said margin and arranged in contacting engagement therewith, means for clamping said margin between said plates, said plates having margins spaced from said screen adjacent the screening area thereof, cushioning means interposed between said lastmentioned margins and said screen, a frame member, and means cooperable on said plates and said frame member for fixedly relating the same.

5. The combination of a wire mesh having a margin of channel-shaped configuration, metal plates of channel-shaped configuration disposed on opposite sides of said margin, one of said plates having a channel-shaped formation to receive a margin of the other plate, said plates and said margin of the screen being welded into a unitary structure, said plates having flanges offset from said wire mesh adjacent the screening area thereof, and cushioning elements positioned between said flanges and the wire mesh, said anges being relatively offset in the plane of said screening area to provide two general lines of bend for the wire mesh.

ROBERT E. LEE MOWBRAY.

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