Patent GB-462236-A (GB)
Title: Improvements in or relating to the manufacture of grid-work, railings and the like
IPC: B21J9/08
Filed: 1935-08-28
Abstract: 462,236. Making fencing &c. BENEDETTO, G. Aug. 28, 1935, No. 24061. [Classes 83 (ii) and 83 (iv)] Upsetting; breaking.-A metal grille, which may be for fencing comprises a number of metal rods inserted through holes in crossmembers to which they are fixed by upset shoulders formed on the rods at each side of the cross member. A rod sufficient for two palings may be used and after upsetting two shoulders thereon equidistant from the centre it is separated by pulling into two blanks with tapering ends. The operations are carried out with the aid of fixed and movable sets of vice jaws gripping the rod, through which an electric current passes between the fixed and movable sets of jaws. In Fig. 5 is shown a machine for forming a pair of shoulders 11 on a double length rod 10 gripped in vices 12, 13. The vices 12 are fixed and electrically connected, and the vices 13 may be fixed or movable and are connected to a source of electric current. When the vices 13 are fixed, the rod is subjected to pressure at both ends and allowed to slide therein, but alternatively the vices 13 may clamp the work tightly and be moved towards the vices 12. The rods after the first upsetting operation are placed in a second machine having vices 14, 15 for engaging a rod as shown in Fig. 2, the vice 15 being capable of movement away from the vice 14 so that when the vices are connected to a source of current and separated from one another, the rod 10 is separated at 16 into two blanks. Thereafter each blank is assembled in turn on its cross members and a third machine used for upsetting. This machine is provided with vices to upset the shoulders on each side of the cross-member. In the first machine, a motor 23 is coupled to a pump 24 ior providing power for the vices, the vice jaws 12 are fixed against longitudinal movement, and the jaws 13 are fixed to cross-heads 26 sliding in guide-ways 27. The vices are opened and closed by corresponding hydraulic rams 28, 29 and rams 30 operate the cross-heads 26. An hydraulic control valve 31 determines the admission of pressure fluid to the rams, and a delay action valve device ensures that the upsetting operation does not take place until the vices are closed and that the upsetting mechanism is not withdrawn until the vice jaws release the rod. The delay action valve device allows of regulating the return movement of the rams 30 and synchronizing it with an automatic feed for the bars. The machine for the operation shown in Fig. 2 dispenses with those of the vices 12, 13 and the rams 28, 29 and 30 to the eight of the chain line indicated, the hydraulic connections to the other ram 30 being arranged so that the vice 13 after closing is drawn away from the vice 12. In the third machine the vices with their associated rams are mounted on a carriage movable in guideways on the framing above which the loosely assembled railing is supported horizontally by a rack. The framing is mounted on wheels to move along the whole length of the assembled railing and to operate in succession on the rods. Specification 465,103 is referred to.