CA2035041A1 - Process and machine for making wire grids - Google Patents
Process and machine for making wire gridsInfo
- Publication number
- CA2035041A1 CA2035041A1 CA002035041A CA2035041A CA2035041A1 CA 2035041 A1 CA2035041 A1 CA 2035041A1 CA 002035041 A CA002035041 A CA 002035041A CA 2035041 A CA2035041 A CA 2035041A CA 2035041 A1 CA2035041 A1 CA 2035041A1
- Authority
- CA
- Canada
- Prior art keywords
- welding
- wire
- bending
- wires
- overlap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
- B21F27/10—Making wire network, i.e. wire nets with additional connecting elements or material at crossings with soldered or welded crossings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
- B23K11/008—Manufacturing of metallic grids or mats by spot welding
Abstract
Method and Machine for Making Wire Grids.
Abstract:
Method and machine for making wire grids in which following a straightening and tensioning step wires are bent to and fro as well as into overlap at a predetermined amplitude about an imaginary axis and are welded together at their points of overlap to form a wire ribbon, whereby immediately after they have been formed and bent into overlap, only two wires are initially retained in frictional engagement and welded together to form a wire ribbon, and thereafter two or more adjacent wire ribbons made in this manner are moved to overlap or abut in the region of the formed wire apices, and are welded together in this regions, whereupon the completed wire grid is rolled up.
Abstract:
Method and machine for making wire grids in which following a straightening and tensioning step wires are bent to and fro as well as into overlap at a predetermined amplitude about an imaginary axis and are welded together at their points of overlap to form a wire ribbon, whereby immediately after they have been formed and bent into overlap, only two wires are initially retained in frictional engagement and welded together to form a wire ribbon, and thereafter two or more adjacent wire ribbons made in this manner are moved to overlap or abut in the region of the formed wire apices, and are welded together in this regions, whereupon the completed wire grid is rolled up.
Description
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Process and Machine for ~Iaking Wire Grids.
The invention relates to a method of manufacturing wire grids, particularly ornamental grids for fences and the like, in which, following a straightening and tensioning step, wires are continuously bent to and fro as well as over one another at a predetermined amplitude about an imaginary longitudinal axis and welded together at their points of overlap to form a wire ribbon. The invention also relates to an apparatus for practicing the method.
For making welded wire grids from wires bent to and fro about an imaginary axis, it is known from U.S. Patent 3,324,900 to feed a plurality of wires to a welding apparatus by means of an endless conveyor chain the successive transversely extending links of which are provided with lugs offset relative to each other about which the wires are bent by means of guide bars reciprocally movable in the transverse direction. Thereafter, the wires overlapping at their apices move through a pair of cooperating welding rollers by means of which the wires are welded together in their regions of overlap.
The known struoture suffers from the disadvantage of being structurally complex and of requiring relatively much space in the direction of manufacture. Moreover, in practice the problem arises that because of positional deviations unavoidable during feeding of the bent wires an exact positioning of the points of overlap of the wires and, therefore, dimensional stability of the completed welded grid cannot be maintained. In the known manufacture such dimensional imprecisions cannot at a later time be compensated so that imperfect grids are produced.
The invention aims at avoiding these disadvantages and at providing a method as well as a machine for its practice which allow manufacturing dimensionally precise wire grids with pre-cisely posi~ioned welding points. The above described methcd in .. . . ~ ... . .. . . .
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Process and Machine for ~Iaking Wire Grids.
The invention relates to a method of manufacturing wire grids, particularly ornamental grids for fences and the like, in which, following a straightening and tensioning step, wires are continuously bent to and fro as well as over one another at a predetermined amplitude about an imaginary longitudinal axis and welded together at their points of overlap to form a wire ribbon. The invention also relates to an apparatus for practicing the method.
For making welded wire grids from wires bent to and fro about an imaginary axis, it is known from U.S. Patent 3,324,900 to feed a plurality of wires to a welding apparatus by means of an endless conveyor chain the successive transversely extending links of which are provided with lugs offset relative to each other about which the wires are bent by means of guide bars reciprocally movable in the transverse direction. Thereafter, the wires overlapping at their apices move through a pair of cooperating welding rollers by means of which the wires are welded together in their regions of overlap.
The known struoture suffers from the disadvantage of being structurally complex and of requiring relatively much space in the direction of manufacture. Moreover, in practice the problem arises that because of positional deviations unavoidable during feeding of the bent wires an exact positioning of the points of overlap of the wires and, therefore, dimensional stability of the completed welded grid cannot be maintained. In the known manufacture such dimensional imprecisions cannot at a later time be compensated so that imperfect grids are produced.
The invention aims at avoiding these disadvantages and at providing a method as well as a machine for its practice which allow manufacturing dimensionally precise wire grids with pre-cisely posi~ioned welding points. The above described methcd in .. . . ~ ... . .. . . .
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accordance with the invention is characterized in that initially only two wires each are, immediately after they have been shaped and bent to overlap, frictionally held together and are welded in pairs to form a wire ribbon, and that thereafter two or more adja~ent wire ribbons formed in this manner are moved into over-la~ or engagement in the region of the formed wire apices, and are welded together in this region, whereupon the completed wire grid is rolled up.
By the making and welding together of dimensionally stable wire ribbons wire grids having exactly positioned welding spots and mesh size are obtained.
Advantageously, the meshes of each wire ribbon formed by welding two wires together are expanded or compacted in the di-rection of manufacture before being welded to an adjacent wire fabric. In this manner, size and shape of the meshes may be exactly defined prior to welding the wires together.
The machine for practicing the method comprising a device for straightening and tensioning of the wires pulled from a wire supply, a device reciprocally movable relative to the direction of manufacture for bending the wires around bending lugs of a continuously rotating bending device, a device associated there-with for welding the wires together and comprising a substantial-ly cylindrical welding drum functioning as a lower electrode and an upper electrode arranged exteriorly thereof, as well as asso~
ciated drive and control devices, in accordance with the inven-tion is characterized by the fact that the bending device is formed as part of the continuously rotatably drivable welding drum, that there is provided at least one pair of bending and welding drums arranged one oYer the other in axially parallel as well as axially displaced relationship, each supporting on its periphery a plurality of bending lugs formed of two electrically insulated halves spaced uniformly from each other in the circum-ferential direction and providing between them areas of overlap fo~ two wires each of which, by an associated device for bending the wires over each other and provided with a guide channel, may 2~3~41 Case H-075 be laid around the bending lugs in frictional engagement therewith, may be held in engagement with the lugs by a hold-down devlce, that each b~ndlng ~nd w~ldlng drum ln tho nron of intersection of the wires between adjacent bending lugs comprises a lower electrode and that the associated upper electrode is movable into the area of overlap between the adjacent bending lugs, that in the removal area of each bending and welding drum there is provided a removing device extending into the meshes of the welded wire ribbon, and that between the removing device and the bending and welding drum there is provided a movable device for tensioning the wire fabric, and that following the removing device there is provided a device by means of which adjacent wire ribbons are moved into overlap or abutment at their apices, and a device for welding the wire ribbons together in their apical regions to form a wire grid.
In accordance with a preferred embodiment of the invention there are associated with each bending and welding drum two devices for placing the wires onto the drum and for bending the wires around successive bending lugs, each device being provided with a push rod movable substantially reciprocally in the direction of the axis of the drum and guiding the wires by means of lugs, and with the guide channel which is stationary and with which each wire is held in engagement with the lug of the push rod during the bending step.
In accordance with a further characteristic of the inven-tion the upper electrode is supported by an electrode holder connected to a stationary transformer by means of a flexible current conductor and pivotably mounted at the end of an elec-trodb arm which at its other end is mounted for pivotal movement coaxially of the bending and welding drum and which by means of a driving device is movable into a position in which the upper electrode is in engagement with the lower electrode, is movable in common with the drum over a predetermined welding distance and thereafter returnable, the electrode holder being biasa~le with welding pressure by means of an associated pressure device.
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Case H-075 Advantageously, several pairs of bending and welding drums displced relative to each other are arranged side by side on parallel drive shafts, the lower electrodes of adjacent bending and welding drums being preferably connected in pairs on a common current conductor for executing double spot welds.
Another preferred embodiment of the invention is characterized in that the pulling device of each bending and welding drum is formed by takers arranged along the circumfe-rence of a rotating support and engaging the points of inter- - -section, the support being preferably divided and the takers being formed by teeth adjustable relative to each other for compacting the wires.
Each of the adjacent wire ribbon pulling devices may, in th direction of production, be succeeded by a transport device for the associated wire ribbon, the transport devices being drivable in common and serving to feed the wire ribbons in overlapping or engaging relationship to a welding device for welding the wire ribbons toyether.
Advantageously, the welding device serving to weld the wire ribbons together moves with the transport devices for a predetermined welding distance and is set up for forming double spot welds, there being preferably provided two electrically connected electrodes for simultaneously welding together two points of overlap in each bent section, a centering pin being provided between the electrodes for extending into ths bent section.
Further characteristics of the invention will be explained in detail in connection with an embodiment referring to the drawings in which:
Fig. 1 depicts a schematic longitudinal section of the machine in accordance with the invention;
Fig. 2a is a front elevation of the intake side of a welding machine in accordance with the invention along line 2a-2a in Fig. l;
Fig. 2b is a view of the welding device along line 2b-2b ,-: :-;:, ,, '1,:, ` ,~`.,. : ` ....... ~ !
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Ca8e H-075 in Fig. l;
Fig. 3a is a schematic side elevational view of the drive device for the welding electrodes for welding individual wires together into a wire ribbon;
Fig. 3b is a corresponding partial view from the intake side;
Fig. 3c is a further partial view;
Fig. 4 schematically depicts the placing and bending of the wires on the bending and welding drum in accordance with the invention, and Fig. 5 schematically depicts the bending and welding opera-tion of the wires as well as the wire ribbons.
In Fig. 1 as well as in the related views of Fig. 2a and ; 2b there is shown an embodiment of a welding machine in accord-ance with the invention, which makes it possible, in a first station S, to manufacture a wire ribbon B from a plurality of individual wires D, by appropriately bending and welding toge-ther, in pairs, two wires Dl, D2 and in a further station Sa to weld together several adjacent ribbons B1, B2 into a com-plete wire grid G.
From a supply drum, not shown, the wire D1 is tangential-ly fed in a taut condition in the direction of the arrow P1 through a straightening device 1 to an upper integral bending and welding drum 2 which is positioned on a shaft 3 drivable in the direction of the arrow P1. At its periphery the bending an~ welding drum 2 is provided with a plurality of bending lugs 4 each one of which i~ electrically insulated ~rom the bending and welding drum 2. The distribution of the bending lugs 4, their spacing from each other, as well as their configuration and dimensions correspond to the configuration of the grid G to be manufactured. As shown in Fig. 2a in connection with the embodiment depicted, each bending lug 4 consists of two half cylinders elactrically insulated from each other.
By means of a placement device 5 which essentially com-prises a push rod 7 provided with at least two bending lugs 6, the wire D1 as shown in Fig. 4a - 4c is positioned in 2~3~
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Case H-075 frictional engagement around one half of the bending lug 4, is in this manner bent to a wave form corresponding to the desired pattern of the wire ribbon B, and connected in frictional engagement with the bending and welding drum 2. An additional,~
guide channel 66, for clarity shown schematically only, as well as guide lugs not shown but affixed to the push rod, ensure that when placed on the bending and welding drum 2 as shown in Fig.
4a - 4c, the wire Dl initially enters (Fig. 4a) at an entry angle W equal to the tangential angle of engagement, is put into an orientation of an entry angle Wa greater than the tangential angle for bending around the bending lug 6 (Fig. 4b) and is thereafter returned to an orientation of the entry angle W (Fig.
4c) and placed around the bending lug 4 in this orientation.` --~
During further transport by the bending and welding drum 2 the wire Dl is additionally guided by a hold-down device 67, shown-schematically in Fig. 4b, in such a manner that it cannot slip-:
off the bending lugs 4. The movement of the push rod 7 requi~ed for the placement is generated by two pivot levers 8 pivotable in the direction of the double arrow P3 and connected to the push rod 7.
A further wire D2 is positioned on the bending and weld- ;
ing drum 2 by a further placement device 5a in a manner which causes the wire D2 to be bent around the other half of the bending lug 4 thus creating a wire D2 bent in a wavelike man-ner which is displaced by exactly one half wavelength relative to the wire Dl. In this arrangement, points of overlap K of the two wavelike bent wires D1, D2 result which are located between the bending lugs 4 arranged consecutively in circumferen- ;
tial~direction. An electrically insulated lower electrode 9 is arranged between the consecutive bending lugs 4, 4a on the bend-ing and welding drum 2. By the continuous rotation of the bending and weldinc3 drum 2 in the direction of the arrow P2 the point of overlap K of the two wi~es Dl, D2 located on the lower electrode 9 is moved below an ùpper electrode 11 ar- !
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C~se H-075 electrode support 10. The electrode support 10 is pivotably mounted at one end of an electrode rocking arm 12 which by its other end is mounted coaxially relative to the bendirlg and welding drum 2 and which is pivotable in accordance with the double arrow P4. This results in a return movement, as shown by a second left arrow, which is quicker than the forward movement.
By means of a drive link 16 connected to the upper elec-trode 11 shown in Fig. 3a, the upper electrode 11 is placed upon the point of intersection K of the wires D1, D2, as a result of forward motion of a pressure rod 13 in accordance with th~
double arrow P5 is subjected to welding pressure by way of an electrode spring 14, and is supplied with welding current from a stationary transformer, not shown, by way of a flexible current conductor 15. The electrical connection between the stationary transformer and the lowar electrode 9 may be provided, for in~
stance, by commutators, not shown. However, double spot welding by which two adjacent points of wire intersection on the bending and welding drum 2 are simultaneously welded together, is more advantageous. For such welding, two adjacent lower electrodes in the same bending and welding drum 2 are connected by a current conductor, and two upper electrodes 11 are present which in a simple manner are each supplied with welding current from the stationary transformer by way of a flexible current conductor 15.
The upper electrode 11 guided by the drive link 16 exactly follows a welding path of the point of overlap K of the wires Dl t D2 as determined by the circumference of the bending and welding drum 2 and thus makes possible a perfect weld of the wires D1, D2 into a wire ribbon B. Upon completion of the welding step the upper electrode 11, guided by the drive link 16, lifts off the weld spot and returns to its inital position.
By means of a starwheel 18 provided with a plurality of teeth 17 and rotatable in the direction of the arrow P6 the wire ribbon B is pulled off the bending and welding drum 2. The ;
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Case H-075 starwheel 18 is positioned on a shaft 19 extending across thei entire width of the machine and drivable in the direction of the arrow P6.
Owing to deviations in the diameter and tensile values Oe the individual wires Dl, D2, different recoil angles result when the wires D1, D2 are bent around the bending lug 4, so ~-that as a result thereof the amplitudes of the undulated wires D1, D2 and, thPrefore, the width of the ribbon B may be ~
irregular. For manufacturing a perfect wire grid G the width~of the ribbons B, B' has to be kept constant. To accomplish this, an expansion path 20 is provided between the starwheel 18 and~
the bending and welding drum 2, which essentially consists of an expansion wheel 21 placed on the ribbon 8 and a motion device 22 for moving the expansion wheel 21 in accordance with the doubl~
arrow P7. By means of the expansion path 20 the ribbon B may be expanded between the bending and welding drum 2 and the star-wheel 18 to a greater or lesser extent, whereby the ribbon is changed, preferably reduced, in its width. Controllinq the motion device 22 may be accomplished, for instance, by a device, not shown, for measuring the width of the ribbon s. By an appropriate configuration and position of the teeth 17 of the st~rwheel 18, shown to be divided in Fig. 2a, an increase in the width of the ribbon B may also be obtained.
By means of a lower bending and welding drum 2' arranged axially parallel to the bending and welding drum 2, and the associated devices described above, which are identified by primed reference characters, a second ribbon B' is manufactured and is pulled off the bending and welding drum 2' by a second starwheel 18~ t .
Each of the two ribbons B, B', guided laterally by a ribbon guide 23, is thereafter transferred to an associated endless conveyor chain 24. Each conveyor chain 24 is trained around a drive wheel 26 affixed to a drive shaft 25 which is drivable in the direction of the arrow P8, extends over the entire width of the machine and is common to all conveyor~~~: `
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chains, and around a tensioning wheel 27 mounted on a tensioning shaft 28. The conveyor chain 24 is provided with a plurality of ~eed lug~ 29 the ~pacing b~tw~n wh~ch may b~ adjusted ~ccord~ng to the distances between the points of overlap K of the ribbon B. The feed lugs 29 engage the points of overlap and continuous-ly feed the ribbon B to the grid welding station Sa. In the embodiment shown, the conveyor chains 24 and the feed lugs 29 for adjacent ribbons B, B' are arranged in such a manner that the apices of both ribbons B, B' overlap, resulting in two points of overlap Ka at which the wires of the two ribbons B, B' may be welded together in the grid welding station Sa.
The grid welding station Sa is provided with an upper electrode support 30 into which preferably two upper electrodes 31 separated by a centering pin 68 shown in Fig. 5 have been inserted, so that both points of wire overlap Ka in the region of the apices of adjacent ribbons B, B' may be welded together simultaneously. ~he centering pin 68 consists of wear resistant insulating material, e.g. ceramic, and serves exactly to set the position of the overlapping apices of the ribbons B, B' during the welding process. By an insulation 32 the electrode suppo~t 30 is connected electrically insulated to an electrode plunger consisting of an upper portion 33 and a lower portion 34. In accordance with the double arrow P9 the upper portion 33 of the electrode plunger is mounted for vertical sliding movement in an upper electrode support 35 which is also vertically slidable in accordance with the double arrow P1o. The lower portion 34 of the electrode plunger is mounted for sliding movement in an upper arm 36 extending over the entire width of the machine and connected to the machine frame, not shown, by means of a suspension 37. By way of a lever 38, the arm 36 is rotatably connected to an upper link 39 pivotable in accordance with the double arrow P11 and thus permits the upper electrode 31 during the welcling step to follow the horizontal movement of the ribbons B, B' fed by the conveyor chain 24 and thereafter to return to its initial position. Since the grid welding station _g_ '~
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Case H 075 Sa is preferably constructed as a double spot weld path pairs of adjacent upper electrode supports 30 are connected with a flex-ible current conductor 40 (Fig. 2b) Electrode pressure is adjustable by means of an adjusting device.
Preferably two lower electrodes 42 are inserted into a lower electrode support 43 which is connected in electrical insulation to a console 45 by means of an insulating layer 44, the console being connected to a lower pivot bar 46 extending over the entire width of the machine. By means of a lever 47 the lower pivot bar 46 is rotatably connected to a lower pivot link 48 pivotable in accordance with the double arrow P12 so that the lower electrode 42 may also follow the horizontal movement of the ribbons B, B ' to be welded together. By way of a plurality of supports ~9 which are preferably positioned opposite the respective console 45, the lower pivot beam 46 downwardly rests upon a lower electrode bar 50 extending over the entire width of the machine and adjustable in accordance with the gage of the wires to be welded. Welding current is supplied to the lower electrode support 43 from a stationary transformer 51 by way of a flexible current conductor 52. By way of a quide wheel 53 at the output end of the grid welding station Sa the conveyor chain 24 is deflected downwardly from the horizontal plane by a small angle, to facilitate the removal of the completed grid G from the conveyor chain 24 by means of a lifting device 54.
Additional tension wires extending longitudinally of the grid may be welded to the meshes of the wire ribbons in the grid welding station Sa. In a further station, the completed grid G
may be welded onto a support, for instance, to a support grid made up of longit-ldinal and transversal wires extending vertical-ly of each other and welded together. Thereafter the completed grid G is rolled up or is cut to the desired assembly length in a succeeding cutting station.
As shown in Fig. 2a, several bending and welding drums 2, 2' may be arrangecl laterally spaced from each other on common ~ ' `~
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parallel shafts 3, 3'. In such an arrangement, the lower elec-trodes 9 of two adjacent bending and welding drums 2 may be coupled together to one current conductor, so that one transfo~m-er only is required for the simultaneous manufacture of two wire ribbons by means of a double spot weld.
Drive means for the movement of the upper electrode 11 àre depicted in Figs. 3a - 3c. The stroke of the upper electrode"~1 required for welding the wires D1, D2 together is generated by an eccentric cam 55 drivable in the direction of the arrow ' P13, the stroke being transmitted to the pressure rod 13 by way of a push rod 56 and a lever 57 to a connecting shaft 58 fixedly connected to the lever 57, and from the shaft 58 by way of an electrode lever 59 also fixedly connected to the shaft 58. An adjustment device 60 is provided for adjusting the electrode pressure.
The upper electrode 11 is driven by a cam disc 61 drivab~e in the direction of the arrow P14, the cam disc controlling a;";' double-armed cam follower 62 which is fixadly connected to a central shaft 63 extending the width of the machine and rotat-ably journalled in the machine frame not shown and which at one end is provided with a biasing spring 64. Driven by the cam ~;
disc 61, a drive lever 65 fixedly connected to the central sha~t 63 executes a pivotal movement in accordance with the double arrow P4 and transmits this motion to the electrode support 10 by way of the pivotably journalled connecting shaft 5~ and the drive link 16 pivotably connected to the connecting shaft 58.
The sequence of placing the wires D1, D2 around the `~
bending lugs 4, 4a, 4b and the corresponding positions of the, ,~
push rod 7 are depicted in Figs. 4a - 4c. The distances of the several bending and welding drums 2 from each other their common shaft 3, the distances between adjacent bending lugs 6, 6a on the push rod 7 and the angular displacement of the lever 8 in accordance with the double arrow P3 are chosen so that the wires may be bent alternatingly on adjacent bending and welding drums by means of the bending lug 6a arranged between two adja~
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cent bending and welding drums 2 on a shaft 3.
~ Ig. 5 ~ch~m~tlc~lly deplctEi on~ ~mbod~m~nt o~ the manu~ac-ture of the grid G, the manufacturing process of the lower rib-bon B' having been displaced in the drawing to yield a clearer view.
The wires D1, D2 and Dl', D2' placed around the bending lugs 4 and 4' in the welding device S and crossing each other are welded together at their point of intersection by the electrodes, of which lower electrodes 9 and 9' have been depict-ed, and are pulled off by means of the starwheels 17 and 17' extending into the meshes of the wire ribbons. In the second welding device Sa, the adjacent ribbons B, B' are thereafter moved to overlap in the region of their apices, are moved for-wardly by the lugs 29 of the conveyor chain 24, not shown, and are welded together at two points in the region of the apices by upper and lower electrodes. Fig. 5 depicts the lower electrodes 42 only which, in the feed direction, are spaced one behind ~he other and which are electrically coupled together. A centering pin 68 protruding into the region of the apices is provided between the electrodes at the welding device. The invention is not, however, limited to two welding spots in the apical region;
it would be possible, for instance, to provide one weld spot only, for instance, if the ribbons touched each other in their apical regions only.
For controlling the placement device 5, the starwheel 18, the expansion path 20, the conveyor chain 24, the drive means 3, 55, 61, the welding devices for welding the ribbons and the grid, as well as the synchronization of the movements of several bending and welding drums 2, 2' for the manufacture of a grid G
from a plurality of ribbcns B, B', there is provided a control device, not shown.
It will be understood, that within the context of the general inventive thought the dPscribed machine may be altered in different ways.
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accordance with the invention is characterized in that initially only two wires each are, immediately after they have been shaped and bent to overlap, frictionally held together and are welded in pairs to form a wire ribbon, and that thereafter two or more adja~ent wire ribbons formed in this manner are moved into over-la~ or engagement in the region of the formed wire apices, and are welded together in this region, whereupon the completed wire grid is rolled up.
By the making and welding together of dimensionally stable wire ribbons wire grids having exactly positioned welding spots and mesh size are obtained.
Advantageously, the meshes of each wire ribbon formed by welding two wires together are expanded or compacted in the di-rection of manufacture before being welded to an adjacent wire fabric. In this manner, size and shape of the meshes may be exactly defined prior to welding the wires together.
The machine for practicing the method comprising a device for straightening and tensioning of the wires pulled from a wire supply, a device reciprocally movable relative to the direction of manufacture for bending the wires around bending lugs of a continuously rotating bending device, a device associated there-with for welding the wires together and comprising a substantial-ly cylindrical welding drum functioning as a lower electrode and an upper electrode arranged exteriorly thereof, as well as asso~
ciated drive and control devices, in accordance with the inven-tion is characterized by the fact that the bending device is formed as part of the continuously rotatably drivable welding drum, that there is provided at least one pair of bending and welding drums arranged one oYer the other in axially parallel as well as axially displaced relationship, each supporting on its periphery a plurality of bending lugs formed of two electrically insulated halves spaced uniformly from each other in the circum-ferential direction and providing between them areas of overlap fo~ two wires each of which, by an associated device for bending the wires over each other and provided with a guide channel, may 2~3~41 Case H-075 be laid around the bending lugs in frictional engagement therewith, may be held in engagement with the lugs by a hold-down devlce, that each b~ndlng ~nd w~ldlng drum ln tho nron of intersection of the wires between adjacent bending lugs comprises a lower electrode and that the associated upper electrode is movable into the area of overlap between the adjacent bending lugs, that in the removal area of each bending and welding drum there is provided a removing device extending into the meshes of the welded wire ribbon, and that between the removing device and the bending and welding drum there is provided a movable device for tensioning the wire fabric, and that following the removing device there is provided a device by means of which adjacent wire ribbons are moved into overlap or abutment at their apices, and a device for welding the wire ribbons together in their apical regions to form a wire grid.
In accordance with a preferred embodiment of the invention there are associated with each bending and welding drum two devices for placing the wires onto the drum and for bending the wires around successive bending lugs, each device being provided with a push rod movable substantially reciprocally in the direction of the axis of the drum and guiding the wires by means of lugs, and with the guide channel which is stationary and with which each wire is held in engagement with the lug of the push rod during the bending step.
In accordance with a further characteristic of the inven-tion the upper electrode is supported by an electrode holder connected to a stationary transformer by means of a flexible current conductor and pivotably mounted at the end of an elec-trodb arm which at its other end is mounted for pivotal movement coaxially of the bending and welding drum and which by means of a driving device is movable into a position in which the upper electrode is in engagement with the lower electrode, is movable in common with the drum over a predetermined welding distance and thereafter returnable, the electrode holder being biasa~le with welding pressure by means of an associated pressure device.
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Case H-075 Advantageously, several pairs of bending and welding drums displced relative to each other are arranged side by side on parallel drive shafts, the lower electrodes of adjacent bending and welding drums being preferably connected in pairs on a common current conductor for executing double spot welds.
Another preferred embodiment of the invention is characterized in that the pulling device of each bending and welding drum is formed by takers arranged along the circumfe-rence of a rotating support and engaging the points of inter- - -section, the support being preferably divided and the takers being formed by teeth adjustable relative to each other for compacting the wires.
Each of the adjacent wire ribbon pulling devices may, in th direction of production, be succeeded by a transport device for the associated wire ribbon, the transport devices being drivable in common and serving to feed the wire ribbons in overlapping or engaging relationship to a welding device for welding the wire ribbons toyether.
Advantageously, the welding device serving to weld the wire ribbons together moves with the transport devices for a predetermined welding distance and is set up for forming double spot welds, there being preferably provided two electrically connected electrodes for simultaneously welding together two points of overlap in each bent section, a centering pin being provided between the electrodes for extending into ths bent section.
Further characteristics of the invention will be explained in detail in connection with an embodiment referring to the drawings in which:
Fig. 1 depicts a schematic longitudinal section of the machine in accordance with the invention;
Fig. 2a is a front elevation of the intake side of a welding machine in accordance with the invention along line 2a-2a in Fig. l;
Fig. 2b is a view of the welding device along line 2b-2b ,-: :-;:, ,, '1,:, ` ,~`.,. : ` ....... ~ !
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~-.
Ca8e H-075 in Fig. l;
Fig. 3a is a schematic side elevational view of the drive device for the welding electrodes for welding individual wires together into a wire ribbon;
Fig. 3b is a corresponding partial view from the intake side;
Fig. 3c is a further partial view;
Fig. 4 schematically depicts the placing and bending of the wires on the bending and welding drum in accordance with the invention, and Fig. 5 schematically depicts the bending and welding opera-tion of the wires as well as the wire ribbons.
In Fig. 1 as well as in the related views of Fig. 2a and ; 2b there is shown an embodiment of a welding machine in accord-ance with the invention, which makes it possible, in a first station S, to manufacture a wire ribbon B from a plurality of individual wires D, by appropriately bending and welding toge-ther, in pairs, two wires Dl, D2 and in a further station Sa to weld together several adjacent ribbons B1, B2 into a com-plete wire grid G.
From a supply drum, not shown, the wire D1 is tangential-ly fed in a taut condition in the direction of the arrow P1 through a straightening device 1 to an upper integral bending and welding drum 2 which is positioned on a shaft 3 drivable in the direction of the arrow P1. At its periphery the bending an~ welding drum 2 is provided with a plurality of bending lugs 4 each one of which i~ electrically insulated ~rom the bending and welding drum 2. The distribution of the bending lugs 4, their spacing from each other, as well as their configuration and dimensions correspond to the configuration of the grid G to be manufactured. As shown in Fig. 2a in connection with the embodiment depicted, each bending lug 4 consists of two half cylinders elactrically insulated from each other.
By means of a placement device 5 which essentially com-prises a push rod 7 provided with at least two bending lugs 6, the wire D1 as shown in Fig. 4a - 4c is positioned in 2~3~
.: , .
Case H-075 frictional engagement around one half of the bending lug 4, is in this manner bent to a wave form corresponding to the desired pattern of the wire ribbon B, and connected in frictional engagement with the bending and welding drum 2. An additional,~
guide channel 66, for clarity shown schematically only, as well as guide lugs not shown but affixed to the push rod, ensure that when placed on the bending and welding drum 2 as shown in Fig.
4a - 4c, the wire Dl initially enters (Fig. 4a) at an entry angle W equal to the tangential angle of engagement, is put into an orientation of an entry angle Wa greater than the tangential angle for bending around the bending lug 6 (Fig. 4b) and is thereafter returned to an orientation of the entry angle W (Fig.
4c) and placed around the bending lug 4 in this orientation.` --~
During further transport by the bending and welding drum 2 the wire Dl is additionally guided by a hold-down device 67, shown-schematically in Fig. 4b, in such a manner that it cannot slip-:
off the bending lugs 4. The movement of the push rod 7 requi~ed for the placement is generated by two pivot levers 8 pivotable in the direction of the double arrow P3 and connected to the push rod 7.
A further wire D2 is positioned on the bending and weld- ;
ing drum 2 by a further placement device 5a in a manner which causes the wire D2 to be bent around the other half of the bending lug 4 thus creating a wire D2 bent in a wavelike man-ner which is displaced by exactly one half wavelength relative to the wire Dl. In this arrangement, points of overlap K of the two wavelike bent wires D1, D2 result which are located between the bending lugs 4 arranged consecutively in circumferen- ;
tial~direction. An electrically insulated lower electrode 9 is arranged between the consecutive bending lugs 4, 4a on the bend-ing and welding drum 2. By the continuous rotation of the bending and weldinc3 drum 2 in the direction of the arrow P2 the point of overlap K of the two wi~es Dl, D2 located on the lower electrode 9 is moved below an ùpper electrode 11 ar- !
ranged in an -^~-....
~ :. . : . , v ,: i ~ ~
,'-", ~
....
21~3~
C~se H-075 electrode support 10. The electrode support 10 is pivotably mounted at one end of an electrode rocking arm 12 which by its other end is mounted coaxially relative to the bendirlg and welding drum 2 and which is pivotable in accordance with the double arrow P4. This results in a return movement, as shown by a second left arrow, which is quicker than the forward movement.
By means of a drive link 16 connected to the upper elec-trode 11 shown in Fig. 3a, the upper electrode 11 is placed upon the point of intersection K of the wires D1, D2, as a result of forward motion of a pressure rod 13 in accordance with th~
double arrow P5 is subjected to welding pressure by way of an electrode spring 14, and is supplied with welding current from a stationary transformer, not shown, by way of a flexible current conductor 15. The electrical connection between the stationary transformer and the lowar electrode 9 may be provided, for in~
stance, by commutators, not shown. However, double spot welding by which two adjacent points of wire intersection on the bending and welding drum 2 are simultaneously welded together, is more advantageous. For such welding, two adjacent lower electrodes in the same bending and welding drum 2 are connected by a current conductor, and two upper electrodes 11 are present which in a simple manner are each supplied with welding current from the stationary transformer by way of a flexible current conductor 15.
The upper electrode 11 guided by the drive link 16 exactly follows a welding path of the point of overlap K of the wires Dl t D2 as determined by the circumference of the bending and welding drum 2 and thus makes possible a perfect weld of the wires D1, D2 into a wire ribbon B. Upon completion of the welding step the upper electrode 11, guided by the drive link 16, lifts off the weld spot and returns to its inital position.
By means of a starwheel 18 provided with a plurality of teeth 17 and rotatable in the direction of the arrow P6 the wire ribbon B is pulled off the bending and welding drum 2. The ;
~ ~ 3 ~ ~ ~
Case H-075 starwheel 18 is positioned on a shaft 19 extending across thei entire width of the machine and drivable in the direction of the arrow P6.
Owing to deviations in the diameter and tensile values Oe the individual wires Dl, D2, different recoil angles result when the wires D1, D2 are bent around the bending lug 4, so ~-that as a result thereof the amplitudes of the undulated wires D1, D2 and, thPrefore, the width of the ribbon B may be ~
irregular. For manufacturing a perfect wire grid G the width~of the ribbons B, B' has to be kept constant. To accomplish this, an expansion path 20 is provided between the starwheel 18 and~
the bending and welding drum 2, which essentially consists of an expansion wheel 21 placed on the ribbon 8 and a motion device 22 for moving the expansion wheel 21 in accordance with the doubl~
arrow P7. By means of the expansion path 20 the ribbon B may be expanded between the bending and welding drum 2 and the star-wheel 18 to a greater or lesser extent, whereby the ribbon is changed, preferably reduced, in its width. Controllinq the motion device 22 may be accomplished, for instance, by a device, not shown, for measuring the width of the ribbon s. By an appropriate configuration and position of the teeth 17 of the st~rwheel 18, shown to be divided in Fig. 2a, an increase in the width of the ribbon B may also be obtained.
By means of a lower bending and welding drum 2' arranged axially parallel to the bending and welding drum 2, and the associated devices described above, which are identified by primed reference characters, a second ribbon B' is manufactured and is pulled off the bending and welding drum 2' by a second starwheel 18~ t .
Each of the two ribbons B, B', guided laterally by a ribbon guide 23, is thereafter transferred to an associated endless conveyor chain 24. Each conveyor chain 24 is trained around a drive wheel 26 affixed to a drive shaft 25 which is drivable in the direction of the arrow P8, extends over the entire width of the machine and is common to all conveyor~~~: `
. . , ,, .
'.`' '. ~ ~: .
2 ~
Case H-O~S
chains, and around a tensioning wheel 27 mounted on a tensioning shaft 28. The conveyor chain 24 is provided with a plurality of ~eed lug~ 29 the ~pacing b~tw~n wh~ch may b~ adjusted ~ccord~ng to the distances between the points of overlap K of the ribbon B. The feed lugs 29 engage the points of overlap and continuous-ly feed the ribbon B to the grid welding station Sa. In the embodiment shown, the conveyor chains 24 and the feed lugs 29 for adjacent ribbons B, B' are arranged in such a manner that the apices of both ribbons B, B' overlap, resulting in two points of overlap Ka at which the wires of the two ribbons B, B' may be welded together in the grid welding station Sa.
The grid welding station Sa is provided with an upper electrode support 30 into which preferably two upper electrodes 31 separated by a centering pin 68 shown in Fig. 5 have been inserted, so that both points of wire overlap Ka in the region of the apices of adjacent ribbons B, B' may be welded together simultaneously. ~he centering pin 68 consists of wear resistant insulating material, e.g. ceramic, and serves exactly to set the position of the overlapping apices of the ribbons B, B' during the welding process. By an insulation 32 the electrode suppo~t 30 is connected electrically insulated to an electrode plunger consisting of an upper portion 33 and a lower portion 34. In accordance with the double arrow P9 the upper portion 33 of the electrode plunger is mounted for vertical sliding movement in an upper electrode support 35 which is also vertically slidable in accordance with the double arrow P1o. The lower portion 34 of the electrode plunger is mounted for sliding movement in an upper arm 36 extending over the entire width of the machine and connected to the machine frame, not shown, by means of a suspension 37. By way of a lever 38, the arm 36 is rotatably connected to an upper link 39 pivotable in accordance with the double arrow P11 and thus permits the upper electrode 31 during the welcling step to follow the horizontal movement of the ribbons B, B' fed by the conveyor chain 24 and thereafter to return to its initial position. Since the grid welding station _g_ '~
~ 2~3~
Case H 075 Sa is preferably constructed as a double spot weld path pairs of adjacent upper electrode supports 30 are connected with a flex-ible current conductor 40 (Fig. 2b) Electrode pressure is adjustable by means of an adjusting device.
Preferably two lower electrodes 42 are inserted into a lower electrode support 43 which is connected in electrical insulation to a console 45 by means of an insulating layer 44, the console being connected to a lower pivot bar 46 extending over the entire width of the machine. By means of a lever 47 the lower pivot bar 46 is rotatably connected to a lower pivot link 48 pivotable in accordance with the double arrow P12 so that the lower electrode 42 may also follow the horizontal movement of the ribbons B, B ' to be welded together. By way of a plurality of supports ~9 which are preferably positioned opposite the respective console 45, the lower pivot beam 46 downwardly rests upon a lower electrode bar 50 extending over the entire width of the machine and adjustable in accordance with the gage of the wires to be welded. Welding current is supplied to the lower electrode support 43 from a stationary transformer 51 by way of a flexible current conductor 52. By way of a quide wheel 53 at the output end of the grid welding station Sa the conveyor chain 24 is deflected downwardly from the horizontal plane by a small angle, to facilitate the removal of the completed grid G from the conveyor chain 24 by means of a lifting device 54.
Additional tension wires extending longitudinally of the grid may be welded to the meshes of the wire ribbons in the grid welding station Sa. In a further station, the completed grid G
may be welded onto a support, for instance, to a support grid made up of longit-ldinal and transversal wires extending vertical-ly of each other and welded together. Thereafter the completed grid G is rolled up or is cut to the desired assembly length in a succeeding cutting station.
As shown in Fig. 2a, several bending and welding drums 2, 2' may be arrangecl laterally spaced from each other on common ~ ' `~
~3~9l~
Case H-075 ~'~
parallel shafts 3, 3'. In such an arrangement, the lower elec-trodes 9 of two adjacent bending and welding drums 2 may be coupled together to one current conductor, so that one transfo~m-er only is required for the simultaneous manufacture of two wire ribbons by means of a double spot weld.
Drive means for the movement of the upper electrode 11 àre depicted in Figs. 3a - 3c. The stroke of the upper electrode"~1 required for welding the wires D1, D2 together is generated by an eccentric cam 55 drivable in the direction of the arrow ' P13, the stroke being transmitted to the pressure rod 13 by way of a push rod 56 and a lever 57 to a connecting shaft 58 fixedly connected to the lever 57, and from the shaft 58 by way of an electrode lever 59 also fixedly connected to the shaft 58. An adjustment device 60 is provided for adjusting the electrode pressure.
The upper electrode 11 is driven by a cam disc 61 drivab~e in the direction of the arrow P14, the cam disc controlling a;";' double-armed cam follower 62 which is fixadly connected to a central shaft 63 extending the width of the machine and rotat-ably journalled in the machine frame not shown and which at one end is provided with a biasing spring 64. Driven by the cam ~;
disc 61, a drive lever 65 fixedly connected to the central sha~t 63 executes a pivotal movement in accordance with the double arrow P4 and transmits this motion to the electrode support 10 by way of the pivotably journalled connecting shaft 5~ and the drive link 16 pivotably connected to the connecting shaft 58.
The sequence of placing the wires D1, D2 around the `~
bending lugs 4, 4a, 4b and the corresponding positions of the, ,~
push rod 7 are depicted in Figs. 4a - 4c. The distances of the several bending and welding drums 2 from each other their common shaft 3, the distances between adjacent bending lugs 6, 6a on the push rod 7 and the angular displacement of the lever 8 in accordance with the double arrow P3 are chosen so that the wires may be bent alternatingly on adjacent bending and welding drums by means of the bending lug 6a arranged between two adja~
1:
-11- '' 1~ ~
:
'~ Case ~-075 ~ ~3 ~
..., i~J
',~
cent bending and welding drums 2 on a shaft 3.
~ Ig. 5 ~ch~m~tlc~lly deplctEi on~ ~mbod~m~nt o~ the manu~ac-ture of the grid G, the manufacturing process of the lower rib-bon B' having been displaced in the drawing to yield a clearer view.
The wires D1, D2 and Dl', D2' placed around the bending lugs 4 and 4' in the welding device S and crossing each other are welded together at their point of intersection by the electrodes, of which lower electrodes 9 and 9' have been depict-ed, and are pulled off by means of the starwheels 17 and 17' extending into the meshes of the wire ribbons. In the second welding device Sa, the adjacent ribbons B, B' are thereafter moved to overlap in the region of their apices, are moved for-wardly by the lugs 29 of the conveyor chain 24, not shown, and are welded together at two points in the region of the apices by upper and lower electrodes. Fig. 5 depicts the lower electrodes 42 only which, in the feed direction, are spaced one behind ~he other and which are electrically coupled together. A centering pin 68 protruding into the region of the apices is provided between the electrodes at the welding device. The invention is not, however, limited to two welding spots in the apical region;
it would be possible, for instance, to provide one weld spot only, for instance, if the ribbons touched each other in their apical regions only.
For controlling the placement device 5, the starwheel 18, the expansion path 20, the conveyor chain 24, the drive means 3, 55, 61, the welding devices for welding the ribbons and the grid, as well as the synchronization of the movements of several bending and welding drums 2, 2' for the manufacture of a grid G
from a plurality of ribbcns B, B', there is provided a control device, not shown.
It will be understood, that within the context of the general inventive thought the dPscribed machine may be altered in different ways.
~ ~ . ~ . . . .
!
Claims (13)
1. Method of making wire grids, particularly ornamental grids for fences and the like, in which wires, following a straightening and tensioning step, are continuously bent to and fro and into overlap at a predetermined amplitude about an imaginary axis and at their points of overlap are welded together to a wire ribbon, characterized by the fact that immediately after they have been shaped and bent to overlap only two wires each are initially frictionally held together and welded to form the wire ribbon, and that thereafter two or more adjacent wire ribbons formed in this manner are moved into overlap or abutment in the region of the formed wire apices and are welded together in this region, whereupon the completed wire grid is rolled up.
2. Method in accordance with claim 1, characterized by the fact that the meshes of each wire ribbon made up of two wires welded together are expanded or compacted in the direction of manufacture prior to the ribbon being welded to an adjacent wire ribbon.
3. Method in accordance with claim 1 or 2, characterized by the fact that simultaneously with the welding together of the wire ribbons tension wires extending in the longitudinal direction of the wire ribbons are welded to the meshes of the wire ribbons.
4. Method in accordance with one of claims 1 to 3, characterized by the fact that before being rolled up the completed wire grid is welded to a support.
5. Machine for practicing the method in accordance with one of claims 1 to 4, comprising a device for straightening and tensioning of the wires pulled from a wire supply, a device movable to and fro transversely of the direction of manufacture for bending the wires into overlap around bending lugs of a rotating bending device, a device associated therewith for welding the wires together which comprises a substantially cylindrical welding drum as a lower electrode and, arranged exteriorly thereof, an upper electrode as well as associated drive and control devices, characterized by the fact that the bending device is made up as a part of the welding drum which is continuously rotatably drivable, that there is provided at least one pair of bending and welding drums (2, 2') which are arranged axially parallel one above the other and displaced relative to each other in the direction of the axis and which each support a plurality of bending lugs (4, 4a) made up of two halves electrically insulated from each other which are spaced from each other in circumferential direction and between which areas of overlap for two wires each are located which are frictionally positionable around the bending lugs by an associated device (5, 5a) for bending the wires into overlapping relationship and provided with a guide channel (67) and which are retainable thereon by a hold-down device (67), that each bending and welding drum (2, 2') in the area of overlap (K, K') of the wires between adjacent bending lugs (4, 4a) is made up as a lower electrode (9, 9') and the associated upper electrode (11, 11') is movable into the area of overlap (K, K') between the adjacent bending lugs (4, 4a), that in the removal region of each bending and welding drum (2, 2') there is provided a removal device (18, 18') extending into the meshes of a welded wire ribbon and that between it and the bending and welding drum there is provided a movable device (20, 20') for shaping the wire ribbon, and that following the removal device (18, 18') there is provided a device (23, 24) with which the adjacent wire ribbons may be moved into overlap or abutment at their apex, and a device (Sa) for welding the wire ribbons in the apical region thereof to a wire grid.
6. Machine in accordance with claim 5, characterized by the fact that with each bending and welding drum (2, 2') there are associated two devices (5, 5a) for placing the wires onto the drum and for bending the wires around the consecutive bending lugs (4), these devices each being provided with a push rod (7) movable to and fro in the direction of the axis of the and guiding the wires with lugs (6) and with the guide channel (66) which is stationary and with which each wire is held in engagement with the push rod (6) during the bending step.
7. Machine in accordance with claim 5 or 6, characterized by the fact that the upper electrode (11, 11') is supported by an electrode support (10, 10') which is connected to a stationary transformer by means of a flexible current conductor (15, 15') and which is pivotably mounted at the end of an electrode arm (12, 12') which at its other end is mounted for pivotal movement coaxially of the bending and welding drum and by a drive means (16) is movable into a position putting the upper electrode into engagement with the lower electrode, is movable with the drum along a predetermined welding path and thereafter returnable, the electrode support being biasable with welding pressure by an associated pressure device (13, 14).
8. Machine in accordance with one of claims 5 to 7, cha-racterized by the fact that several pairs of bending and welding drums (2, 2') are arranged in side by side relationship and dis-placed relative to each other on parallel drive shafts (3, 3'), the lower electrodes (9, 9') of adjacent bending and welding drums (2, 2') for executing double spot welding being preferably electrically connected in pairs in a current connection.
9. Machine in accordance with one of claims 5 to 8, characterized by the fact that the device (20) for making the wire ribbon is provided with a forming roll (21) movable into engagement with the wire ribbon by a movement device (22).
10. Machine in accordance with one of claims 5 to 8, characterized by the fact that the removal device of each bending and welding drum (2, 2') is made up of lugs (17) provided at the periphery of a rotating support (18) and engaging the points of overlap of the wire ribbon, the support being preferably made up to be divided and the lugs for compacting the wire ribbon being made up of teeth adjustable relative to each other.
11. Machine in accordance with one of claims 5 to 10, characterized by the fact that in the direction of manufacture there is provided, following each the adjacent wire ribbon removal device (18, 18') a transport device (24) for the associate wire ribbon, the transport devices (24) being drivable in common and are provided for conveying the wire ribbons overlapping or abutting each other to a welding device (Sa) for welding the wire ribbons together.
12. Machine in accordance with claim 11, characterized by the fact that the transport device consists of an endless conveyor chain (24) provided with wire ribbon lugs (29) and having lateral guides (23) associated therewith.
13. Machine in accordance with claim 11 or 12, characterized by the fact that the welding device (Sa) for welding together the wire ribbons moves with the transport devices (24) for the wire ribbons over a predetermined welding path and is made up for a double spot weld, there being preferably provided at both sides of the welding plane two electrodes (31, 42) electrically connected to each other and having arranged between them a centering pin (68) penetrating into the apical region, for the simultaneous welding of two points of overlap (Ka) in each apical region.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0154089A AT401485B (en) | 1989-06-22 | 1989-06-22 | METHOD AND MACHINE FOR PRODUCING WIRE GRIDS |
| ATA1540/89 | 1989-06-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2035041A1 true CA2035041A1 (en) | 1990-12-23 |
Family
ID=3515643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002035041A Abandoned CA2035041A1 (en) | 1989-06-22 | 1990-06-12 | Process and machine for making wire grids |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0429606B1 (en) |
| JP (1) | JPH04500334A (en) |
| AT (2) | AT401485B (en) |
| CA (1) | CA2035041A1 (en) |
| DE (1) | DE59002736D1 (en) |
| ES (1) | ES2022062A4 (en) |
| HU (1) | HU904764D0 (en) |
| WO (1) | WO1990015677A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT407501B (en) * | 1996-06-13 | 2001-04-25 | Evg Entwicklung Verwert Ges | METHOD AND DEVICE FOR THE PRODUCTION OF WIRE GRID |
| NO310100B1 (en) * | 1999-05-14 | 2001-05-21 | Thor Bjoernstad | Two-layer screen cloth and method of manufacture thereof |
| AT409100B (en) | 2000-07-24 | 2002-05-27 | Evg Entwicklung Verwert Ges | DEVICE FOR WELDING A WIRE GRID |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2000788A (en) * | 1933-04-12 | 1935-05-07 | Reed William Edgar | Method of making wire fabric |
| US2004409A (en) * | 1933-12-07 | 1935-06-11 | Durward K Hopkins | Apparatus and method for forming screen from wire |
| US2628642A (en) * | 1948-05-20 | 1953-02-17 | Ray F Stockton Wire Products C | Method of making wire lath |
| US2633877A (en) * | 1948-08-28 | 1953-04-07 | Ray F Stockton Wire Products C | Wire and machine for making |
| DE967152C (en) * | 1950-09-24 | 1957-10-10 | Georg Koerner | Method and machine for welding wire nets |
| AT179952B (en) * | 1952-02-02 | 1954-10-25 | Evg Entwicklung Verwert Ges | Welded grid |
| DE1221601B (en) * | 1962-01-24 | 1966-07-28 | Drahtwerke Roesler K G | Device for the continuous production of wire nets with diamond-shaped meshes |
| US3546771A (en) * | 1968-09-20 | 1970-12-15 | Stryco Mfg Co | Paper back lath making machine |
| AT365486B (en) * | 1979-08-03 | 1982-01-25 | Evg Entwicklung Verwert Ges | MACHINE FOR THE AUTOMATIC MANUFACTURING OF WELDED LUMBAR CARRIERS |
-
1989
- 1989-06-22 AT AT0154089A patent/AT401485B/en not_active IP Right Cessation
-
1990
- 1990-06-12 JP JP2508315A patent/JPH04500334A/en active Pending
- 1990-06-12 EP EP90908916A patent/EP0429606B1/en not_active Expired - Lifetime
- 1990-06-12 HU HU904764A patent/HU904764D0/en unknown
- 1990-06-12 WO PCT/AT1990/000060 patent/WO1990015677A1/en active IP Right Grant
- 1990-06-12 ES ES90908916T patent/ES2022062A4/en active Pending
- 1990-06-12 DE DE90908916T patent/DE59002736D1/en not_active Expired - Fee Related
- 1990-06-12 CA CA002035041A patent/CA2035041A1/en not_active Abandoned
- 1990-06-12 AT AT90908916T patent/ATE94440T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE94440T1 (en) | 1993-10-15 |
| EP0429606A1 (en) | 1991-06-05 |
| WO1990015677A1 (en) | 1990-12-27 |
| ES2022062A4 (en) | 1991-12-01 |
| HU904764D0 (en) | 1991-08-28 |
| DE59002736D1 (en) | 1993-10-21 |
| ATA154089A (en) | 1996-02-15 |
| EP0429606B1 (en) | 1993-09-15 |
| JPH04500334A (en) | 1992-01-23 |
| AT401485B (en) | 1996-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |