US2194222A - Screen - Google Patents

Description

Patented Man 19, 1940 Wallrley B. Ewing,

j to Ewing DevelopmentCom'pany,

seminar Grand Rapids, Mich, assignor Bay City.

Micln, a corporation oi Michigan Application November 7, 1938, Serial No. 239,228

'3 Claims.

Patent'2,0'78,940 whereby to render this type of I cloth more suitable for the purpose disclosed as well asrendering the same useful in broader fields of application generally.

It isa further object to improve the arrangement of warp wires relative to'the filler or woof wires of elongated cross-section; and to improve the arrangement of the warp wires of each pair relative to each other, whereby to produce a fabric that is less subject to permanent distortion and displacement of its constituent parts relative to each other, and which fabric possesses other important and improved properties.

It is a still further object to so integrate the two wires of each pair of warp wires between successive filler wires that a much smaller number of pairs of warp wires are made necessary per unit of width of cloth. thus increasing the percentage of open space between the respective pairs ,of warp wires without changing the spaced relationship between successive filler wires.

It is a still more specific object to provide a cloth of the present class having all of the above listed improved properties, while at the same time increasing the percentage of visible space therethrough where the same is to be employed in the capacity of shade and/or insect screen.

ing the above properties which, by virtue of these properties and the additional fact that the maximum area of contact is afforded, is thus rendered peculiarly adapted for use in gas and liquid contact apparatus such, for example, as in airconditioning equipment and ,in fractionating equipment.

The above and other objects, advantagesand uses of my invention willbecome more apparent to from a reading of the following specification and claims taken in connection with the appended drawing which forms a part of this specification and wherein; p i

Fig. 1 is a front elevation of a piece of wire cloth fabricated in accordance with my invention;

Fig. 2 is a side elevation of cloth shown in F 1;

Fig. 3 is a. plan view in 33 of Fig. 1,

section taken on line and I! of each pair Still another object is to provide a screen hav- Fig. 4 is a view similar to Fig. 2, but showing a slightly modified arrangement wherein the filler wire is inclined to the plane of the cloth at less than a right angle.

In fabricating wire cloth in accordance with the teaching of the Grebe patent, I have discovered that when the cloth is subjected to the stresses common thereto there results a'relative movement between the respective wires of each pair of warp wires at the point where these wires cross each other, namely between each of the filler strips. This relative movement in many cases leads to distortion and/or displacement of the elements of the material from which there is not a complete return to the original relationship of these elements. I have discovered that in order to produce a cloth'having the desirable properties discussedin the outset of this specifica-r tion, it is necessary to integrate or fasten together the respective wires of each pair of warp wires between successive filler wires. I have found that this can be effectively accomplished by twisting together the respective wires of each pair of warp wires between successive filler wires.

Referring to the figures of the drawing, my improved form of cloth consists essentially of a plurality of definitely spaced filler wires iii of elongated or ribbon-like cross-section positioned with their long sides parallel to each other and disposed at an angle to the plane of the cloth. The filler wires ID are effectively locked in this position by a pluralityof pairs of warp wires ii, ii, the twowires of each pair passing alternately over and under successive filler wires. Wires ii are twisted together to form integrating twists l3 between successive filler wires, thus differentiating the present cloth from the usual arrangement of simple over and under weave of the warp wires such as shown in the abovereferred to- Grebe patent. It is these integrating twists in the combination that impart to my improved cloth the important properties that difierentiate it from the known type of structure.

, Referring specifically to Figs. 1 and 2, I have shown a'section of my improved form of wire filler wires ill have been right angle to the plane fabric wherein the flat woven into, the cloth at a thereof. Referring specifically to Fig. 4, I have shown a section of wire fabric wherein the flat filler wires ill have been woven into the fabric at an angle a with respect to a perpendicular to the plane of the fabric. This angle may be given any desired value depending upon the particular use to which the screen is to be put. I have found that values of angle a ranging from 10 degrees to 45 degrees have utility in various relationships ranging from light and heat control for building windows to use in gas and liquid contact apparatus.

It will be observed that by constructing the integrating connections between the warp wires by twisting the same together no additional binding material need be incorporated in the structure. A more uniform and otherwise more satisfactory joint is thus provided than would result even if welding were resorted to in combination with a simple over and under weave.

I propose to construct this form of fabric with various sizes of interstices having different sizes of ribbon or filler wires woven therein depending upon the particular use to which'the cloth is to of this type which is to be used as an insectand light-controlling screen, the vertically extending warp wires may safely be spaced at least as much as .20 inch apart due to the increased strength imparted to the screen by the integrating twist I3. It is thus readily apparent that the percentage of open visible space through my improved form of screen is greatly increased over that wherein a simple over and under weave of the warp wires is employed. This wider spacing of the pairs of warp wires has the further advantage of reducing the amount of material necessarily going into a unit of cloth.

The vertical spacing of the ribbon-like filler wires where the cloth is to be used as a window screen, will of course be limited by the size of insect against which it is primarily directed and will hence be of the order of from 0.040 to about 0.100 inch, in most instances preferably being about 0.050 inch. In such a case, the ribbon strip will range from between about 0.002 to about 0.005 inch in thickness by 0.025 to 0.10 inch in width, the latter width being preferred.

While I have described my invention in connection with certain specific embodiments thereof and while certain preferred dimensions have been mentioned, it is to be understood that this is by way of illustration and not by way of limitation and the scope of my invention is defined solely by the appended claims which should be construed as broadly as the prior art will permit.

I claim:

1. A metal fabric composed of a plurality of spaced pairs of warp wires extending lengthwise of the fabric, a plurality of spaced filler wires extending transversely of said warp wires, said filler wires being elongated in cross-section and having their longer sides positioned at an angle to the plane of the fabric, said fabric being particularly characterized by the fact that said filler wires are tied firmly in position therein by means of interlocking twists between the respective two wires of each of said pairs of warp wires between successive ones of said filler strips.

2. A metal fabric composed of a plurality of spaced pairs of warp wires extending along the length of the cloth, a plurality of evenly spaced filler wires extending transversely of said warp wires, said filler wires being ribbon-like in shape and having their longer sides positioned at a predetermined angle to the plane of the fabric, said fabric being particularly characterized by the fact that said filler wires are tied firmly into posl-, tion in said fabric by means of interlocked twists between the respective wires of each of said pairs of warp wires between successive ones of said filler wires." 7

3. A metal fabric adapted for use as a contact screen in a gas and liquid contact apparatus for supplying a large area of contact per unit area of screen comprising a plurality of pairs of spaced warp wires, a plurality of evenly spaced filler wires extending transversely of said warp wires, said filler wires being ribbon-like or.elongated in cross-section, the width being at least several times the thickness thereof, said filler wires being positioned with their long sides at a predetermined angle to the plane of the fabric, said fabric being particularly characterized by the fact that said filler wires are tied firmly in place by means of interlocked twists between the respective wires of each pair of warp wires between respective ones of said filler wires whereby to supply a fabric having the property of retaining its shape as well as the relative disposition of its constituent parts.

4. In a metal fabric the combination of a plurality of substantially parallel metal strands extending cross-wise of the fabric and having an elongated cross-section throughout their length, the long sides of said parallel members being positioned at an angle to the plane of the fabric, and a plurality of pairs of spaced warp strands extending along the length of said fabric and locking said parallel members in position therein,

said combination being particularly characterized by the fact that said locking is effected by integrating twists between the respective wires of each of said pairs of warp wires between successive ones of said parallel members.

5. In a metal screen for light and insect control, a plurality of substantially parallel ribbonlike filler wires extending transversely of said screen and spaced apart a distance of the order of about 0.10 inch, the major surfaces of said members being inclined at a predetermined angle to the plane of the screen, and a plurality of pairs of warp wires extending along the length of said screen and embraceably locking said members in position, said arrangement being particularly characterized by the fact that said locking arrangement comprises integrating twists between each of the warp wires of said pairs between successive ones of said members.

6. In a screen fabric, the combination of, a plurality of fixed, substantially parallel filler or woof members of elongated cross section throughout their length and having their major surfaces inclined to the plane of the fabric, and at least one warp member tying said woof members in a predetermined position, said warp member being composed of two filaments having an interlocking twist between adjacent woof members.

7. In a screen fabric, the combination of, a plurality of fixed, substantially parallel filler or woof members of elongated cross section throughout their length and having their major surfaces inclined to the plane of the fabric, and a plurality of spaced, substantially parallel warp members tying said woof members in a predetermined position, said warp members each consisting of a pair of wires having an interlocking twist between adjacent woof members.

WALKLEY B. EWING.

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