US2315055A - Screen cloth - Google Patents

Description

R. D. HELLER SCREEN CLOTH March 30, 1943.

Original Filed July 19, 1940 m w m BKJHAQD D. HELLER,

Patented Mar. 30, 1943 Richard D. Heller, Columbus, Ohio Original application July 19,1940, Serial Na. 346,342. Divided and this application May 23, 1941, Serial No. 394,846

12 Claims. (Cl. 209-400) This invention relates to screen cloths, and one of the objects of the invention is a unique screen cloth which is particularly adapted for use in vibratory apparatus which operates to convey unscreened material along such screen cloth without undue wear or injury.

Another object of the invention is the provision of a cross-strip intermediate the ends of a screen cloth comprising parallel wires, having a maximum surface contact with such wires to reduce to a minimum the tendency of such crossstrip to become detached from such wires during operation of the screen cloth.

More particularly it is the object of the present invention to provide an improved method of attaching to a parallel wire screen cloth a plurality of contiguous metal cross-wires and soldering a cross-strip to all of the wires to produce a crossstrip composed of such cross-wiresand said crossstrip soldered to each other and soldered to the parallel wires of the screen and thereby reduce to a minimum the tendency of the cross-strip to become detached during operation of the screen cloth.

Other objects of the invention will appear here'- inafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawing:

Fig. 1 is a plan view of a completed screen cloth embodying my improvements;

Fig. 2 is an enlarged edge view of one of the intermediate cross-strips shown in plan in Fig. 1;' Fig. '3 is a side view of the screen cloth of Fig. 1; Fig. 4 is an end view of a vibratory deck with my improved screen cloth mounted thereon;

Fig. 5 is an enlarged perspective view showing a portion of one of the intermediate cross-strips shown in plan in Fig. 1;

Fig. 6 is another enlarged perspective view similar to Fig. 5 but taken from a different angle;

and

Fig. "7 is a sectional elevation of preferred mechanism for carrying out my improved method of soldering a fiat cross-strip to one side of the wires of the screen cloth and a plurality of contiguous wires to the other side of the screen cloth 'of the. screen cloth shown in Fig. 1 I have shown in Fig. 4 the preferred screen cloth mounting mechanism illustrated in the drawings of my copending application 8. N. 273,328, filed May 12,

1939, for an improvement in Screens.

The method herein disclosed relates particularly to the construction of spaced-apart cross.- strips I9, 19 intermediate the end bars 56, I3, of a screen cloth comprising a plurality of substantially straight or non-woven wires preferably made of high carbon Swedish steel known as bright music or piano wires. As pointed out in my Patent No. 2,220,106 granted Nov. 5, 1940, for an improvement in Screen cloth andmethod of making same, this type of screen cloth wire is very hard and tough and consequently has a very long life in an operating screen cloth, thus making it extremely desirable for this purpose. That patent relates to improvement in the end bars of a screen of this type whereas the herein disclosed invention relates to the spaced-apart cross-strips i9, 19 intermediate the end bars, as indicated in the above-mentioned objects of the present invention. While my improvements herein disclosed are particularly adapted for use in vibratory screening apparatus they may have a general application in various types of screening mechanisms. J

As shown in Fig. 4, the vibratory deck frame I0 is provided with attaching anchorages 43 and 55 for receiving the end bars 13 and 56 respectively of the screen cloth shown in plan view in Fig. 1;, The attaching anchorage 43 is flxed to the deck frame whereas the anchorage 55 is connected to screen tension mechanism 50. The cross-strips I9, I8 serve as hearing areas between the screen cloth and the elongated strips of wood 38, 38, which rest'in elongated troughs 39, 39 mounted on supports secured rigidly to the cross beams one of which is shown at 23 in Fig. 4.

The method of attaching the cross-strips I9, 19 to the parallel wires 3|, 3| of the screen cloth will now be described. A support 11 coextensive with the width of the screen panel 51 of Fig. 1, or coextensive with the length of the cross-strips I9, is provided with a plurality of spaced-apart lifting screws I55 which are threaded through the elongated channel member I45 which is also of the same length as that of the cross-strip 19.

Along the channel member I45 extends a-heater element I51 having a bottom plate I5I) serving as a bearing strip for engagement by the upper ends of the spaced lifting screws I55. Mounted on the heater element I5I is an elongated metal tray I53 having its bottom lined with a strip of center elongated groove 92 coextensive with the cross-strip II. In this groove "is placed a pluralityofstrahdsofwireli whichmaybeof the samecyaswires3i..'rhegroovel2is treated topreclude solder adhering thereto.

Upon supporting the screen cloth by anchoring the and bars thereof in fixed and stationary positionaandliftingtheplatelltointurnlirt shown in 4 for mounting the screen on the deck of vibratory apparatus in crown formation.

the channel Ill, the side strips I41, I" may be forcedagainst thebottoms of the wires", ii and held there with the plate II in fixed and stationaryposition. 'Ihismaybedonebymeansofthe apparatus disclosed in the patent application 8. N. 846,342, new Patent No. 2,233,878.

withtbepartsadjustedasillustratedinl ig. 7,

thewiresilwillbe forcedintointimatecontact withthewii'esfl andthestripofsolderwhichis laidontopofthewires 3| above thewirestlis melted, after a reasonable heating period, by the heat fromthe heater element ill.

, as disclosed-in my parent application, Serial No. 346,342, now Patent No. 2,283,878, tensioning may be applied to one end of the screen cloth while the other end is connected to a fixed anchorage so that the parallel wires of the screen cloth may beheld taut during the operation of soldering the cross-strips thereto. While the solder is in molten condition an elongated rectangular strip 0! tin plate It (sheet iron coatedwithtin) islaidon topof thewires II whereupon the electric current to the heater III is cut off and the solder allowed to solidify with the tin plate strip 34 soldered to one side of the wires 3| and the transverse wires 93 soldered to the other side of the wires 3|, thereby producing the cross strip connection II.

'Ihe illustration in Fig.2 is reversed from that of Fig. 'I because Fig. 2 shows the operating positionofthescreenclothwiththewiresllontop thereofwhilel'lg. 'ishowsthe wiresll inthe elonafltedtroughllinthetopof thehotplatell. lprefertolocatethewiresllontheupper side of the screen for two reasons. In the first A place, the wires "are much stronger and much the solder is about 57% greater than the area of contact between the solder and the metal strip 84 and consequently the resistance against detachment offered by the wire cross-strip on top is much greater than would be oflered by the plate 24 if it were Md ontop.

Obviously thoseskilled in the art may make various changes in the details and arrangement of parts without d from the spirit and scopeoftheinven onasdefinedbytheclaims hereto appended, d I therefore wish.not to be restricted to the p construction herein disclosed.

Having thus describedand shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. A screen cloth comprising the combination with a plurality of parallel strands of wire, of attached end bars, and a cross-strip formed of a plurality of adjacent parallel strands of wire each having a cylindrical surface and each soldered over approximately half its cylindrical surface to each other and to said first-named parallel strands to extend transversely of the latter on one side only of the screen cloth.

2. A screen cloth comprising the combination with a plurality of parallel strands of cylindrical wire, of attached end bars, and a cross-strip, iormed of a plurality of adjacent parallel strands of cylindrical wire, all adhesively attached to each other and to said first-named parallel strands of wire to extend transversely of the latter on one side only thereof and intermediate said end bars. I

8. A screen cloth comprising the combination with a plurality of parallel strands of wire, of attached end bars, a non-woven cross-strip formed of a plurality of adjacent parallel strands of wire each having a cylindrical surface and soldered to each other and to said first-named parallel strands of wire to extend transversely of the latter intermediate the said end bars.

4. A screen cloth comprising the combination with a plurality of parallel strands of wire, of attached end bars, and a non-woven cross-strip formed of a plurality of adjacent strands of wire each having a cylindrical surface and soldered to each other and to said parallel strands to extend transversely of the top only of the screen cloth in the path of movement of unscreened material.

5. A screen'cloth comprising the combination with a plurality of parallel strands of cylindrical wire, of attached end bars, a cross-strip of adjacent strands of wire each having a cylindrical surface and extending across the parallel strands of cylindrical wire on the upper side of the screen cloth,and an elongated cross-plate soldered to In my copending application, 8. 390,386,

' flied All. 25, 1941, Patent No. 2,283,881, granted In my co-pending application 8. N.- 273,328,

filed May 12, 1939, for an improvement in Screens,

Ihavedisclosedandclaimedthem" the lower side of said screen and to said-crossstrip, the latter being also soldered to said parallel strands of wire.

6. A screen cloth comprising the combination with a plurality of parallel strands of wire, of attached end bars, a cross-strip formed of a plurality of adjacent strands of cylindrical wire with wide areas of their cylindrical surfaces soldered to each other and to said parallel strands, and an elongated strip of sheet metal tin-plated and soldered to said parallel strands of wire directly opposite said cross-strip of wire strands.

'l. A'screen cloth comprising the combination with a plurality of strands of steel wire, of attached end bars, a cross-strip formed of a plurality of adjacent parallel strands of steel wire each having a cylindrical surface and soldered to each other and to said plurality of strands, and an elongated strip of tin-plated sheet metal soldered to said plurality of strands and to said cross-strip, the latter being on one side of the screen cloth and the sheet metal strip being on the opposite side and both extending transversely of the said plurality of strands of steel wire.

8. A screen cloth comprising the combination with a plurality of parallel strands of wire, of attached end bars, a plurality of spaced-apart cross-strips intermediate the end bars and each strip comprising a plurality of adjacent parallel strands of wire each having a cylindrical surface and each soldered together over approximately half its cylindrical surface and to said first mentioned parallel strands of wire, and a plurality of spaced-apart elongated sheet metal crossstrips intermediate said end bars and soldered to said first mentioned parallel strands of wire directly opposite said cross-strips of wire, said wire cross-strips and said sheet metal strips being on opposite sides of the screen cloth.

9. A screen cloth comprising the combination with a plurality of parallel strands of cylindrical wire, of a cross-strip of a plurality of adjacent parallel strands of cylindrical wire on one side of the screen cloth, and an elongated cross-strip on the other side of said screen cloth, the cross strips being soldered to each other and to the parallel strands of wire of the screen cloth with the first-named wires submerged in solder and the wires of the first-named cross-strip being soldered over approximately half its cylindrical surface to each other.

10. A screen comprising parallel end bars connecting the ends of spaced parallel wires, spacedapart flat strips soldered to said parallel wires to extend transversely thereof in spaced-apart relation to each other and to said end bars, and a plurality of transverse sets of parallel adjacent wires each having a cylindrical surface and each soldered over approximately half its cylindrical surface to said first-named wires with each set also soldered to one of said fiat strips, all of the flat strips being on one side of the screen and all of the sets of parallel adjacent wires thus soldered being on the opposite side of the screen with each flat strip directly opposite one of said sets and soldered thereto as well as to the first-named parallel wires of the screen.

11. A screen cloth comprising the combination with a plurality of parallel strands of wire, of

attached end bars, and a cross-strip on one side only of the screen cloth and formed of a plurality of parallel strands of wire each having a cylindrical surface and soldered to each other and to said first-named parallel strands to extend transversely of the latter on said one side of the screen cloth.

12. A screen cloth comprising the combination with a plurality of parallel strands of cylindrical wire, of attached end bars, a connecting strip consisting of a metal plate on one side of said strands of cylindrical wire secured to transverse strands of closely adjacent parallel cylindrical wire on the other side and located intermediate said end bars, and solder submerging the first-named wires over the width of the strip and extending over substantially half the cylindrical surface of each transverse strand of wire.

RICHARD D. HELLER.

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