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AssigneeUnited Wire Limited
InventorsGordon James Cook, Andrew Hughes, Arthur Robert Bailey, George Charles Hartnup, Dugald Stewart
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A method is described for making a reinforcing wire frame for embedding in a moulded polymer support frame over which woven wire cloth is to be stretched and secured to form a sifting screen. The method involves locating lengths of cut wire substantially equally spaced apart in a jig to form a first array. A second array of lengths of cut wire is located over the first array with the lengths of wire in the second array being substantially at right angles to those of the first array. The lengths of wire in the first and second arrays are resistance welded at points of mutual intersection so as to form a first substantially rectilinear matrix. Lengths of cut wire are located in a jig to form a third array, in which the lengths are also substantially equally spaced apart, and a fourth array of lengths of cut wire is arranged over the third array with the lengths of the fourth array substantially at right angles to the lengths of wire of the third array, and the wires of the third and fourth arrays are also resistance welded at points of mutual intersection to form a second substantially rectilinear matrix.
A wire frame reinforcing fabrication for incorporation into a sifting screen support frame, constructed from resistance welded steel wire matrices arranged in two parallel spaced apart planes and themselves welded together along at least two edge regions by welds between protruding ends of the wires of the two matrices, so that a pair of parallel spaced apart wires will extend through each rib the ribs forming an intersecting array of ribs in the support frame, and wherein protruding wires along at least two sides of one of the arrays are bent so as to make contact with wires of the other array and the ends of the bent portions of the wires of the one array are welded to the protruding ends of the wires in the other array, so as to maintain separation between the two matrices.
Dependencies are inferred from the claim text.