US1678941A - Method of making woven-wire screens - Google Patents

Description

July 31, 1928. 1,678,941

A. E. HELMAN METHOD OF MAKING WOVEN WIRE SCREENS Original Filed June 9, 1927 I 1 E 7 Iuwenfor h? AugustEHdman u a 6 W W fimwgs.

- Patented July 31, 1928.

UNITED STATES PATENT OFFICE.

AUGUST E. HELMAN, OF CLEVELAND, OHIO, ASSIGNOR TO THE W. S. TYLER COMPANY,

OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

METHOD OF MAKING WOVEN-WIRE SCREENS.

Original application filed June 9, 1927, Serial No. 197,643. Divided and this application filed June 20,

1928. Serial No. 286,999.

The present invention, relating as indicated to a woven wire screen, 1s more particularly directed to an improved method of makin a woven wire screen to .avoid the l necesslty for rolling or flattenlng the screen after weaving, for the purpose of bringing into substantially the general plane ofthe screen the knuckles or knees of the Wires.

transverse wires upon the longitudinal,

wires, with the result that the rolling or flattening process, while benefitting the 2 screen in one respect is a serious detr ment in another and produces a screen which is loose, sleazy, and very much moresub ect to movement of the wires out of their original position with the resultant inaccuracy of the grading of materials. In many cases the rolling of the screen distorts the mesh so much that it cannot be used at, all and in almost every case some distortion is produced by ro ling.

The present inventlon s directed to an improved method of maklng a woven wire screen, and particularly to an improved method of preliminarily treating one or both series of wires to secure the desired as results without losing any of the benefits of the employment of preliminarily crimped transverse wires.

To the accomplishment of the foregoing and related ends, said invent ion, then, consists of the means hereinafter fully described and particularly pointed out in the claims; the annexed drawing and the following description setting forth in detail one method of carrying out my invention, such disclosed procedure constituting, however, but one of the various applications of theprlnciple of my invention.

In said annexed drawings Fig. 1 is a transverse sectional view showing a pair of crimping rolls with wires passed therebetween; Fig. 2 is an enlarged sectional view showing the action of the rolls on the wire; Fig. 3 is an enlarged view of the wire after the crimping treatment;

Referring now to Fig. 1, there are shown two co-operative rolls 1 and 2, which are provided with a series of teeth or corrugations 3 and 4, respectively. Between these two rolls is passed a wire 5 which, as it is engaged between the teeth, is bent into corrugated portions 6, shown at the left of Fig. 1. The rolls 1 and 2 are so spaced and the corrugating elements or ribs 3 and 4 are so proportioned in depth and in spacing from each other that as the wire is engaged between the rolls the apex 7 of each rib or tooth forces the wire against the recess 8 in the other roll corresponding in position to the tooth 7 and slightly 'flattens the crest 9 of the crimped portion of the wire and also the recessedsurface 10 of the same portion, since the spacing between the apex of the tooth and the corresponding recess of the other roll is less than the normal thickness of the wire. 5. The teeth of the rolls are spaced apart sufficiently so that the wire when crimped is not forced completely into contact around the sides of the ribs or teeth, but is spaced slightly from these sides, as indicated inFig. 2, except at the crests of the corrugations, with the result that the metal intermediate the crests of the successive corrugations is not engaged by theteeth and is not worked or hardened during this action. The crests of the corrugations which form the so-called knuckles of the woven screen are, however, worked and hardened during the bending and flattening operation, producing a much increased rigidity and strength at the intersections, that is, the interengagingpoints of the transverse and longitudinal wires of the final screen. In some cases only the transverse or the longitudinal wires are preliminarily crimped, and a screen formed of such wires is very much superior to one made in the former way and then rolled.

The form of the preliminarily crimped wire is shown in Fig. 3 and the finished screen in Fig. 4. In the latter view the longitudinal wires 11 are shown received within the angular recesses or knuckles 12 of the transverse wires 5, and these longitudinal wires are there being held without any loosening of the engagement; Frequently the wires are loosened when the woven screen is rolled by the old method to bring the knuckles into the general plane of the screen, as has already been explalned. In this View there are also shown the flattened crests 9 of the corrugations in the transverse wires.

My improved screen, or one made by my improved method hereinbefore described, is equally level and flat as screens made by previous methods, is very much more rigid and less subject to variation in the spacing between longitudinal wires, and is stronger in the wires which have been crimped because of the temper given to the knuckle portions of the corrugations by the action of the crimping rolls. A further important advantage of the present screen lies in the fact.

that a better screen of a materially longer life may hefproduced at a lower cost than that of the former screens.

This application'is a division of m applicat'ion Ser. No. 197,643, filed June 9, 1927.

Other modes of applying the principle of my invention may e emgloyed instead of the one explained, change eing made as regards the method herein disclosed, provided the step or steps stated by any of the following claims or the equivalent of such stated step or steps he employed. c

I therefore particularly point out and distinctly claim as my invention 1. In a method of making a woven wire screen, the steps which consist in preliminarily bending one series of wires into crimped condition with'an exact and predetermined spacing between the crimps therein, simultaneously flattening the crest of each of such crimps to harden and increase the flattened antenna the rigidity of the wires at such points, and then weaving said Wires into a screen by an ranging them in parallelism and positioning a second set of wires at right angles to the first set and engaged in locked relation in portions of said first-named wires.

2. In a method of making a woven wire screen, the steps which consist in preliminarily 'hcnding one series of wires into a crimped condition with an exact and predetermined spacing between the crimps therein, simultaneously flattening the crest of each of such. crimps to harden and increase the rigidity of the Wires at such points, bending the second series ofwires also into a crimped condition with an exact and-predetermmed spacing between the crimps therein, also simultaneously flattening the crests of the crimped portions of saitlsecond series of wires; and then weaving-said wires into a screen by arranging the first set in parallelism with the'respective crimps in transverse alinement and positioning said second series of wires at right angles to the first, while causing the flattened crimped portions of both series of Wires to be engaged in locked relation with each other.

3. In a method of making a woven wire narily crimping the transverse wires to the contour required in a woven screen, simultaneously flattening the upper and'lower surfaces at the crest of each of such crimps to harden and increase the rigidity of the wires at such points, and then weaving said preliminarily crimped transverse wiresthrough parallel longitudinal wires to produce a woven wire screen.

Signed by me', this 16th day of June, 1928.

AUGUST E. HELMAN.

screen, the steps which consist in prelimi-

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