Patent GB-276045-A (GB)
Title: Improvements in and relating to the manufacture of wire netting and the like
IPC: B21F27/12
Filed: 1926-04-17
Abstract: 276,045. Jagger, B. April 17, 1926. Wire fabrics.-Wire netting for reinforcing concrete slabs or structures &c. is woven into tubular form, cut longitudinally, and opened out to form a sheet. The woven tube may be formed by first coiling the wire around a drum, then forming a shed longitudinally of the drum by pulling or pushing adjacent coils in opposite directions, then threading a straight rod or wire through this shed, so that it will be gripped between the coils as a weft member, afterwards releasing the shed-forming members, and rotating the drum a distance correspondisg to the required distance apart of the weft members, and repeating the wefting process until the tube is complete. In a modification, the wire is wound round a drum at a pitch double that required, and straight rods &c. are placed longitudinally on this coil at a distance apart double that required for the weft members; over them and between the coils. of the first winding, a second coil is wound, and at a plane between the weft members, the adjacent coils are pulled or pushed in opposite directions to form a shed for a locking weft member, the shed is released, the drum rotated and another locking-member introduced between the next two weft members, and so on. Old or worn or stranded wire rope or cable may be used. The winding drum may comprise end members 6, 7, Figs. 1 and 3, each constructed of four equal segmental portions 6a, 6b, 6c, 6d mounted on longitudinal parallel members 8, 9 having depending members 10, 11 with inclined flanges 10a, 11a, engaging correspondingly inclined flanges 12a, 13a of plates 12 ou octagonal carriers 14, 15 bored to receive a tubular shaft 2 and connected by screws 16 to slides 17, 18. These can be operated by collars on a screwed shaft 21 furnished with a hand wheel 21b to collapse the drum to facilitate removal of the fabric. The end bearings 4b, 5b for the shaft 2 have removable bearing caps, and their supporting members are so constructed that they can be turned down in succession, as illustrated in dotted lines, to facilitate the removal of the woven tube. Gearing is described for driving the shaft 2 so as to rotate the drum when winding on the wire. The drum surface is formed of wood members &c. supported between the segments of the members 6, 7. The wire is passed through guide rollers and tensioning devices, and travelling guiding apparatus operated by a screw may be used to determine the pitch of the windings. The longitudinal wires &c. may be laid between teeth 6h fixed on the periphery of the member 6, 7. A modified winding drum is described wherein segmental castings are used provided with wood strips to form the drum covering. The sheds for receiving the weft locking-wires &c. may be formed by means of pairs of parallel plates 30a, 30b, Figs. 8, 11, and 12, extending the full width of the winding drum and connected by links 40d 40e, 41d, 41e on opposite sides of two nuts engaging oppositely threaded parts of a shaft 49 mounted on a shedding frame 40. This can be run on wheels so as to operate on two tubes simultaneously, by fixing it between them, so that the oppositely disposed pairs of plates 30a, 80b operate simultaneously ; or the shed frame may be constructed to operate inside a partly woven tube after this has been removed from the drum. The shed frame is placed with the hooklike projections on the plates 80b extending between the wire coils w, w<1>, after which the shaft 49 is moved longitudinally by means of a hand wheel 50b and mechanism described, whereby the hook members 30d are caused to engage the wires w<1>, Fig. 11. The shaft 49 is then rotated by means of a hand wheel 49<a>, and the links 40d, 40e, 41d, 41e cause the plates 30a, 30b to move laterally in opposite directions to the position shown in Fig. 12, the wires w, w<1> being moved to form a shed in which a weft wire. is inserted. The hand wheels are then rotated to release the shed, the drum is rotated, another weft wire is inserted through a fresh shed, and so on until the tube has been woven. The Provisional Specification describes devices for use when winding the wires upon the winding drum shaft comprising a worm shaft, tension roller shaft and a guide roller shaft, the worm ensuring the correct spacing of the coils as laid.