US2634789A - Means for decorating screen wire - Google Patents

Description

April 14, 1953i R.'BuRDlcK MEANS RoR DECORATING SCREEN WIRE Filed may 14, 1949 2 SHEETS-SHEET l FIG. 2.

FIG H v INVENTQR RICHARD BURDICK ATTORNEY Patented Apr. 14, 195,3

UNITED STATES PATENT OFFICE Claims.

This invention relates in general to certain new and useful improvements in means for decorating screen wire and is related to my copending application Serial No. 93,266, led May 14, 1949.

For advertising purposes, it has been found desirable and expedient to emboss, imprint, or otherwise form a plaque-like advertising display upon a defined area of a piece of woven screen wire which is inserted in a conventional manner in the door screens and Window screens of commercial establishments. Because of the fact that every customer entering and leaving the establishment will see a sign or other advertising display which is incorporated in the screen door, such advertising media are particularly useful, but, by the same token, are subjected to extreme conditions of wear and tear. Frequent slamming of the door tends to jar the advertising display loose, the display is frequently brushed against as the door is opened and. closed, and, of course, it is continuously exposed to the weather and, since screen doors are normally used in the summertime, the advertising sign or display is ordinarily exposed to the heat of the sun for a number of hours each day and, therefore, tends to dry out and become extremely brittle.

Heretofore. advertising screenl wire has been manufactured by the so-called silk screen process. This method is substantially a hand process, since each piece of screen wire must be placed in a suitable jig or holding fixture beneath the silk screen and a proper screening compound squeegeed through the silk into the interstices of the screen wire. In order to achieve an attractive eye-catching result through the employment of several different colors, it obviously becomes necessary to employ several diierent screens through which the diiferent colors of screening compounds may be passed and it is necessary to permit each piece of screen wire to dry before the next successive application of screening compound. Obviously, such procedure must be carried out to very close register and is time-consuming.

It is, therefore, the primary object of the present invention t0 provide means and methods for embellishing screen wire with a plaquelike advertising element which is extremely rugged, durable, and attractive in appearance and can be introduced into or applied upon the screen wire automatically and withv a minimum of hand labor.

It is a further object ofv the present invention to` provide automatic means for embellishing screen wire by the application thereto of a plaque-like advertising element.

It is an additional object of the present invention t0 provide means and methods of the type stated which are simple, economical, and capable of substantially. continuous operation.

With the above and other objects in view, my invention resides in the novel features of form, construction, arrangement and combination of parts presently described and pointed out in the claims.

In the accompanying drawings (two sheets)- Figure 1 is a top plan view of a screen wire decorating machinev constructed in accordance with and embodying the present invention;

Figure 2 is a longitudinal sectional View taken along line 2-2 of Figure 1;

Figure 3 is a fragmentary side elevational view of the screen wire decorating machine showing in more detail the gear drive to the heated rollers thereof;

Figure 4 is a fragmentary sectional view taken along line 4-4 of Figure 1;

Figures 5 and 6 are fragmentary sectional views taken along lines 5-5 and 6 6, respectively, of Figure 2;

Figure 'T is a fragmentary sectional view taken along line 1-1 of Figure 6;

Figure 8 is a fragmentary sectional vView taken along line 8 8 of Figure 5,;

Figure 9 is a fragmentary sectional view taken along line 9-9 of Figure 5;

Figurel 10 is a fragmentary sectional View taken along line Ill-l0 of Figure 2;

Figure 11 is a fragmentary perspective view of a section of screen wire embellished with a plaque-like advertising element; and

Figure 12 is a fragmentary sectional View taken along line I2-l2 of Figure 11.

Broadly speaking, the present invention comprises a horizontal table having upper and lower conveyor runs extending thereacross. The upper and lower conveyors are provided With ilights and are driven in timed relation, so that, as the conveyors move across the table, one of the flights of the upper run will always be superimposed in vertical alignment with one of the llights of the lower run. Means is also provided for continuously feeding a web of screen wire between the conveyor runs and provision is made for feeding in to the flights sections of thermo-plastic material having a selected or predetermined peripheral contour and being positioned within the flights in such mannerthat, when the flights accuse Q are superimposed, the two sections of thermoplastic or fusible material will be in peripheral registration on opposite sides of the web of screen wire and moving along with it. In such position, the sections are passed between a plurality of pairs of heated rolls which serve to soften the sections of thermo-plastic or fusible material and force them through the interstices of the screen wire and merge with each other. Thereafter, the screen wire may be passed between additional rolls, if necessary, to smooth or, if desired, emboss the oppositely presented faces of the now completely merged and consolidated plastic plaquelike advertising element. Finally, the web of screen wire thus embellished may, if desired, pass beneath a suitable cut-off mechanism for severance into sections of suitable length.

Referring now more specifically and by reference characters to the drawings, which illustrate a preferred embodiment of the present invention, A designates a screen wire decorating machine comprising a horizontally disposed framework I formed of side rails 2, 3, transversely welded at their ends to cross rails 4, 5, and supported above the floor upon legs 6. Welded or otherwise secured to and extending horizontally between the legs 6 in downwardly presented relation to the frame I is a reinforcing sub-frame 'l similarly including cross rails 8, 9, and longitudinally extending side rails I0. Rigidly mountedl upon and extending horizontally between the side rails lil, approximately midway of the length of the machine A, is a shelf plate II for supporting a conventional electric motor I2 which is drivingly connected to a conventional gear reduction box I3 having a power output shaft I4, which is, in turn, conventionally provided with a driving sprocket I5. The electric motor I2 is connected to a conventional switch I6 to any suitable source of electric current (not shown).

Welded along its longitudinal margins to and extending horizontally between the side rails 2, 3, is a relatively heavy gauge sheet metal tab-le plate II which is substantially coincident at its forward end (reference being had to the right side of Figures l and 2) with the end rail 5, and at its opposite or rearward end the table plate Il terminates in inwardly spaced relation to the end rail 4 and is marginally bent downwardly in the provision of a curved lip I8. Approximately midway of its length'the table I'I is provided with three transversely lspaced parallel slots I9 separated by relatively narrow bridging bars 23 and directly forwardly thereof the plate I1 is further provided with a transversely extending somewhat wider slot 2| separated from the adjacent slot I9 by a wide bridging bar 22. Forwardly of the slot 2| is a transversely extending wide slot or opening 23, the forward transverse margin of which is bent downwardly in the provision of a curved lip 24.

Welded to and extending vertically upwardly from the side rails 2, 3, in alignment with the opening 23 are posts 25, 26, respectively, and similarly welded to the side rails 2, 3, and extending vertically upwardly therefrom in rearwardly spaced parallel relation to the posts 25, 26, are posts 2'1, 28, having rearwardly projecting horizontal trunnion bars 29, 39. Journaled at their ends in and extending horizontally between the posts 25, 26, in upwardly spaced relation to the tance below the side rails 2, 3, and journaled in and extending horizontally between such downwardly projecting ends is a shaft 35, also provided with sprockets 36. One of the sprockets 33 is aligned with one of the sprockets 34, which is, in turn, vertically aligned with one of the sprockets 36 in such a manner that the three sprockets 33, 34, and 36 on one side of the machine lie in substantially the same vertical plane while the corresponding vsprockets 33, 34, 36, on the opposite side of the machine also lie in the same vertical plane. Similarly, journaled in and extending horizontally between the posts 21, 28, are shafts 3l, 38, located in horizontal alignment, respectively, with the shafts 3l, 32, and are provided with pairs of sprockets 39, 40. One of the ysprockets 40 is vertically aligned on one side of the machine with one of the sprockets 39 and these two sprockets are also horizontally aligned with the sprockets 33, 34, 36, and similarly the other sprocket 40 is vertically aligned with the other corresponding sprocket 39 on the opposite side of the machine and these latter two sprockets are likewise horizontally aligned with the sprockets 33, 34, 36, on that side of the machine.

Welded to and projecting a short distance downwardly from the side rails 2, 3, are bracket plates 4I located along a transverse line which lies approximately midway between the end rail 4 and the curved lip I8 of the table plate I1. Journaled in and extending horizontally between the bracket plates 4I beneath the table plate I1 is a shaft 42 located in horizontal alignment with the shaft 35 and provided with sprockets 43 which are horizontally aligned with the sprockets 36. On onevof its ends, the shaft 35 projects outwardly beyond the side rail 2 and is provided with driving sprockets 44, 45, the latter being connected by a conventional roller chain 46 to the main driving sprocket I5. Inwardly of the side rail 2, the shaft 35 is further provided with a spur gear 4l, which is of somewhat larger diameter than the sprockets 36 and projects along the upper portion of its periphery through the opening 23 in the table plate I'I for meshing engagement with a similar spur gear 48 pinned to the shaft 3l.

Trained around each horizontally aligned set of sprockets 36, 43, are conveyor chains 49 for carrying a uniformly spaced series of horizontal flight plates 50.' The size of the sprockets 36, 43, and the location of the shafts 35, 42, is such that the upper horizontal run of the conveyor chains 49 will extend slidingly across the upwardly presented face of the table plate I1 and the flight plates 50 are so mounted on the chains 49 that they will ride horizontally forwardly over the table plate I1 with their under faces n slightly upwardly spaced relation to the upwardly presented face ofthe table plate I1. Similarly trained around each set of sprockets 33, 34, 39, 40, is a conveyor chain 5I likewise provided at uniformly spaced intervals with transversely extending flight plates 52. The sprockets 33, 34, 39, 40, are so positioned that the lower horizontal run of theconveyor chains 5I will extend across the table plate I1 in upwardly spaced relation to the corresponding horizontal run of the conveyor chains 50, and the flight plates 52 are so positioned that they will each be located in precise vertical alignment for coincident travel with a corresponding flight plate 50. The flight plates 52, 50, are furthermore provided centrally of their forward leading edges as they travel together forwardly across the table plate |1 with vertically aligned semicircular recesses 53, 54, respectively. It will be noted by reference to Figure 5 that the flight plates 58, 52, are so arranged that they are spaced vertically apart from each other during the course of their travel together forwardly over the table plate I1 whereby to accommodate therebetween a traveling web of screen wire w which is fed downwardly around a suitably mounted idler roll 55 from a supply roll 56, which is conventionally trunnioned in the trunnion bars 29, 30. It will be noted in this connection that the idler roll 55 is located just rearwardly of the sprockets 39 and substantially forwardly of the sprockets 43. Thus the flight plates 50 will travel for a substantial distance over the table plate I1 before they pass under, and begin to take up travel with, the screen wire web w, for purposes presently more fully appearing.

Rigidly secured to the side rails 2, 3, are roller mounting plates 51, 56, positioned in and extending along that portion of the frame I in which the slots I9, 2|, are located. Journaled in and extending horizontally between the roller mounting plates 51, 56, is a plurality of pairs of hollow heated rollers 59, 68, each such pair of rollers 59, 68, being vertically aligned on opposite sides of one of the openings I8 and being spaced from each other by a distance somewhat greater than the combined thickness of the screen wire web w and a vertically aligned matching pair of flight plates 56, 52. At one end, the hollow rollers 59, 68, are respectively provided with axially extending stub shafts 6|, 62, which are journaled in and extend through the plate 58 and at their outer ends are provided with intermeshing spur gears 63, 64. At their opposite ends, the rollers 59, 68, are provided with axially extending tubular shafts 65, 66, communicating at their inner ends to the interior of the rollers and at their opposite ends being journaled in and extending through the plate 51 for rotative disposition within manifolding collars 61, 68, which are, in turn, connected to steam headers 69, 18, all as best seen in Figure 5.

Journaled in and extending horizontally between the mounting plates 51, 58, forwardly of the rollers I9 and vertically aligned on opposite sides of the gap 2| are large smoothing rolls 1I, 12. The shafts of the rolls 1I, 12, project outwardly through the plate 58 and are provided with intermeshing spur gears 13, 14. Rotatably mounted upon the external face of the plate 58 and meshingly interposed between each of the spur gears 63 and between the forwardmost gear 63 and the spur gear 13 are small idler gears 15, so that all of the several gears 63, 64, 13, 14, will be intermeshed and the rollers 59, 68, 1|, 12, will move simultaneously and at the same peripheral speed. The shaft of the roller 12 furthermore projects outwardly beyond the spur gear 14 and is provided with a sprocket 16 which is drivingly connected by means of a roller chain 11 to a sprocket 1B keyed upon the outwardly projecting end of the shaft 35. Similarly journaled in and extending horizontally between the rails 2, 3, forwardly of the shafts 3|, 35, and adjacent to the lip 24 is a pair of vertically aligned stripping rollers 19 to facilitate separation of the flight plates 56, 52, from the screen wire web w.

Welded to and extending vertically upwardly from the side rails 2, 3, forwardly of the lip 24 are transversely aligned bracket plates 88 having vertical slots 8| for receiving vertically shiftable upper and lower journal blocks 82, 83, normally biased toward each other by compression springs 84, 85, respectively. Journaled in and extending horizontally between the journal blocks 82, 82, and 63, 83, are horizontal shafts 66, 81, respectively, and pinned thereto are suitably spaced pairs of driving wheels 83, 89, respectively, formed preferably, though not necessarily, of rubber and being vertically aligned through apertures 80, 8|, suitably located in the table plate I1. Thus, when the screen wire web w is fed between the pairs of rubber driving wheels 88, 88, the latter will be forced toward each other by the springs 8d, 65, so as to securely engage the screen wire web w without deforming it. The shaft 36 extends outwardly beyond the side rail 2 and on such extended end is provided with a sprocket 52 which is drivingly connected by means of a roller chain 93 to the sprocket 44.

Rigidly mounted upon and extending vertically upwardly from the side rails 2, 3, forwardly of the bracket plates 86, are transversely aligned posts 84 cross-connected at their upper ends by a stabilizing beam 85. Rigidly mounted upon and extending vertically above and below the bearn 35 is a conventional hydraulic cylinder 56 having a downwardly extending shiftable piston rod 31 connected at its lower end centrally of a vertically disposed shearing blade 98, which is, in turn, provided at its opposite ends with integrally formed outwardly extending ears 99 slid* ably disposed between way-forming bars |66 bolted or otherwise rigidly secured to the inwardly presented faces ofthe posts 64. Directly beneath the shearing blade 98, the table plate I1 is provided with a transversely extending clearance slot HH having a rearward edge |82 ground off for shearing co-operation with the sharpened edge of the shearing blade 98. The hydraulic cylinder 96 is connected by means of oil tubes |83 to a conventional hydraulic pump and control valve (not shown), the latter being arranged to actuate the hydraulic cylinder at predetermined or timed intervals in relation to the speed of movement of the screen wire web w for severing the latter into sections of desired length. If desired, a mechanical shear driving mechanism of any conventional design may be substituted for the hydraulic cylinder 96.

In operation, steam of an appropriate temperature is admitted through the tubular shafts 65, 65, to the rollers 59, 68. If desired, hot oil or electric heating elements may be employed in stead of steam. When the rollers 58, 68, have reached the desired temperature, the switch I5 is turned, energizing the motor I2, which, acting' through the gear reduction box |3, the sprocket I5, and the roller chain 46, drives the shaft 35 and with it the shafts 3|, 32, 31, 36, 42, and the roller chains d8, 5|, causing the flight plates 58, 52, to move around into paired position over the table plate I1 and thence forwardly between the rolls 53, 68, and 1|, 12. Rotation of the shaft 35 is, transmitted through the roller chain 11 and the sprocket 16 to the spur gears 13, 14, and thence to the spur gears 63, 64, so that the rollers 58, 68, 18, 1I, all begin to rotate. Similarly, the rotation of the shaft 35 is transmitted through the roller chain 33 and the sprocket 92 to the shaft 86 and the driving wheels 88 are thereby turned, propelling the screen wire web w forwardly.

As each fiight plate 58 comes up onto the upper horizontal run and moves over the lip I 8 onto the table plate I1, it sin the clearfor a short interval 'of time before ittravels beneath the idler roller 55 and passes under the traveling screen wire web w. During this interval, the loperator may manually place in the recess 53 a plaque |04 of relatively thin thermo-plastic sheet material which has been preformed by die-cutting or any other suitable process. Similarly, as the flight plates 52 move downwardly and around into the forwardly traveling horizontal run above the moving screen wire web w, each such flight plate 52 will be in the clear, so to speak, during the interval that it traverses the distance between the shaft 31 and the first pair of heated rollers 59, 6D. Thus, the operator will manually place a second preformedthermo-plastic element or plaque in the recess 54, which is thereupon carried forwardly on top of the screen wire web w in marginally registered alignment with the plaque |013, which is sliding along the upper surface of the table plate on the under side of the screen wire web w. Held in this relation by the flight plates 5B, 52, the screen wire web and the superposed plaques |54, |55, pass between the successive pairs of heated rollers 59, 60, and are thereby softened and pressed together, so that they will, in effect, flow through the' interstices of the screen wire web w and fuse with each other to form a solid background element B. Upon continuation of forward travel, the screen wire web w and the fused background element B pass between the smoothing rolls 1|, 72, which are set at such a distance as to lightly engage the oppositely presented faces of the background element B and impart thereto a relatively smooth, even surface or finish. Thereafter, the screen wire web w with its smoothed background element B pass between the stripping rollers 59, which insure complete separation of the flight plates 5G, 52. Finally, the screen wire web w passes beneath the shearing blade 98, which is actuated as previously described, to sever the screen wire web w into sections of desired length.

The outwardly presented faces of the background element B may thereafter be painted, imprinted, embossed, or decorated in any other conventional manner for artistic or advertising purposes as may be required.

It should be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the screen wire decorating machine and in the several steps of the screen Wire decorating methods may be "of screen wire,'said last named flights being also made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what l' claim and desire to secure by Letters Patent is:

l. A screen wire decorating machine comprising a flat surfaced table-like element, means for rotatably supporting a roll of screen wire over said table-like element, means for feeding a continuous web of screen wire from said roll onto and across said table-like element from a line spaced inwardly from one end of said table-like element so as to leave an uncovered intake apron on the table-like element ahead of the screen wire, a rst flight conveyor mounted operatively upon the table-like element and having flights positioned for movement initially across the intake apron and thence beneath the web of screen wire, said ilights being contoured in their leading edges for receiving a plaque of thermoplastic material and pushing the plaque across the surface of the table-like element therebeneath the web of screen wire for movement therewith, a second flight conveyor operatively mounted on the opposite side contoured in their leading edges for receiving a plaque of thermoplastic material and holding it upon the upper surface of the web of screen wire, said flight conveyors being timed for movement at the same rate of speed as the web of screen wire and furthermore so that a flight of each conveyor will be coincident and travel together with the web of screen wire thereby causing the thermoplastic plaques respectively carried by each to move in superposed marginal registration with each other and on opposite faces of the screen wire, and heated rollers disposed on opposite sides of the web of screen wire for riding over the outwardly presented faces of said plaques and simultaneously heating them and pressing them toward each other so as to fuse them together to each other through the interstices of the screen wire.

2. A screen wire decorating machine comprising a fiat surfaced table-like element, means for rotatably supporting a roll of screen wire over said table-like element, means for feeding a continuous web of screen wire from said roll onto and across said table-like element from a line spaced inwardly from one end of said table-like element so as to leave an uncovered intake apron on the table-like element ahead of the screen wire, a first flight conveyor mounted operatively upon the table-like element and having flights positioned for movement initially across the intake apron and thence beneath the web of screen wire, said ights being contoured in their leading edges for receiving a plaque of thermoplastic material and pushing the plaque across the surface of the table-like element therebeneath the web of screen wire for movement therewith, a second liight conveyor operatively mounted on the opposite side of the web of screen wire with respect to the first night conveyor and having a plurality of nights positioned for movement above and with the web of screen wire, said last named flights being also contoured in their leading edges for receiving a plaque of thermoplastic material and holding it upon the upper surface of the web of screen wire, said flight conveyors being timed for movement at the same rate of speed as the web of screen wire and furthermore so that a flight of each conveyor will be coincident and travel together with the web of screen wire thereby causing the thermoplastic plaques respectively carried by each to move in superposed marginal registration with each other and on opposite faces of the screen Wire, heated rollers disposed on opposite sides of the web of screen wire for riding over the outwardly presented faces of said plaques and simultaneously heating them and pressing them toward each other so as to fuse them together to each other through the interstices of the screen wire, and means located on the opposite side of the heating rollers with respect to the intake apron for cutting the web of screen wire into sections of predetermined length.

3. A screen wire decorating machine comprising a fiat surfaced table-like element having a transverse gap intermediate its ends, means for rotatably supporting a roll of screen wire over said table-like element, means for feeding a continuous web of screen wire from said roll onto and across said table-like element from a line spaced inwardly from one end of said table-like element so as to leave an uncovered intake apron on the table-like element ahead of the screen wire, a rst night conveyor mounted operatively upon the table-like element and having nights positioned for movement initially across the intake apron and thence beneath the web of screen wire, said nights being contoured in their leading edges for receiving a plaque of thermoplastic material and pushing the plaque across the surface of the table-like element therebeneath the web of screen wire for movement therewith, a second night conveyor operatively mounted on the opposite side of the web of screen wire with respect to the nrst night conveyor and having a plurality of nights positioned for movement above and with the web of screen wire, said last named nights being also contoured in their leading edges for receiving a plaque of thermoplastic material and holding it upon the upper surface of the web of screen Wire, said night conveyors being timed for movement at the same rate of speed as the web of screen wire and furthermore so that a night of each Iconveyor will be coincident and travel together with the web of screen wire thereby causing the thermoplastic plaques respectively carried by each to move in superposed marginal registration with each other and on opposite sides of the screen wire, and heated rollers operatively mounted in said gap above and below the surface of the table-like element and thereby being disposed on opposite sides of the web of screen wire for riding over the outwardly presented faces of said plaques and simultaneously heating them and 4pressing them tow-ard each other so as to fuse them together to each other through the interstices of the screen wire.

4. A screen wire decorating machine comprising a nat surfaced table-like element, means for rotatably supporting a roll of screen wire over said table-like element, means for feeding a continuous web of screen wire from said roll onto and across said table-like element from a line spaced inwardly from one end of said table-like element so as to leave an uncovered intake apron on the table-like element ahead of the screen wire, a nrst flight conveyor mounted operatively upon the table-like element and having nights positioned for movement initially across the intake apron and thence beneath the web of screen wire, said nights being contoured in their leading edges for receiving a plaque of thermoplastic material and pushing the plaque across the surface of the table-like element therebeneath the web of screen Wire for movement therewith, a second flight conveyor operatively mounted on the opposite side of the web of screen wire with respect to the first flight conveyor and having a plurality of nights positioned for movement above and with the web of screen wire, said last named nights being also contoured in their leading edges for receiving a plaque of thermoplastic material and holding it upon the upper surface of the web of screen wire, said night conveyors being timed for movement at the same rate of speed as the web of screen wire and furthermore so that a night of each conveyor will be coincident and travel together with the web of screen wire thereby causing the thermoplastic plaques respectively carried by each to move in superposed marginal registration with each other and on opposite faces of the screen wire, heated rollers disposed on opposite sides of the web of screen wire for riding over the outwardly presented faces of said plaques and simultaneously heating them and pressing them toward each other so as to fuse them together to each other through the interstices of the screen wire, and smoothing rollers disposed on opposite sides of the web of screen wire and on the opposite side of the heated rollers with respect to the intake apron for riding upon the outwardly presented surfaces of the fused plaques for smoothing said surfaces and rendering them substantially parallel to each other so that the plaques, when fused together, will form a single unit of substantially uniform thickness with smooth surfaces on opposite sides of the screen wire.

5. A screen wire decorating machine comprising. means for feeding a continuous web of screen wire along a denned path so arranged that for a substantial portion of its travel along the path the screen wire travels in a nat plane, a first night conveyor mounted operatively upon one side of the web of screen wire, said night conveyor being provided with a plurality of spaced nights, each of which is contoured in its leading edge for receiving a plaque of thermoplastic material and feeding the plaque against the surface of the `web of screen wire for movement therewith, a second night conveyor operatively mounted on the opposite side of the web of screen wire with respect to the nrst night conveyor and having a plurality of spaced nights positioned for movement with the web of screen Wire, said last named nights being also contoured in their leading edges for receiving a plaque of thermoplastic material and holding it against the web of screen wire for movement therewith, said night conveyors being timed for movement at the same rate of speed as the web of screen wire and being arranged so that the nights of one conveyor will each be respectively coincident With e. corresponding flight of the other conveyor so that the pairs of coincident nights will travel together with the web of screen wire, thereby causing the thermoplastic plaques respectively carried by each to move in superposed marginal registration with each other and on opposite faces of the screen Wire, and heated rollers disposed on opposite sides of the web of screen wire for riding over the outwardly presented faces of said plaques and simultaneously heating them and pressing them toward each other so as to fuse them together to each other through the interstices of the screen wire.

RICHARD BU'RDICK.

References Cited in the le 0f this patent UNITED STATES PATENTS Number Name Date 2,028,670 Hosking Jan. 21, 1936- 2,078,448 Jost Apr. 27, 1937 2,135,763 Nicholson Nov. 8, 1938 2,230,189 Ferngren Jan. 28, 1941 2,424,558 Delano July 29, 1947 2,477,300 Klarol et al July 26, 1949

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