Patent GB-205050-A (GB)
Title: Improvements in or relating to welding chain-links, rings, or the like
IPC: B21L3/00
Filed: 1923-06-26
Abstract: 205,050. Servais, A., (Assignee of Bindel, F. TV.). Oct. 6, 1922, [Convention date]. Chains; rings.-In welding- chain-links, rings, &c., the bevelled ends of a heated U- shaped blank are bent over and then welded, first by the application of pressure in a direction practically at rightangles to the bevel faces and then by the application of a series of pressures in a direction radially of the joint in a plane at right-angles to the plane of the link. A U-shaped blank O, Fig. 11, is placed in a vertical position by hand through a previous link, which is held by tongs 82, 83 mounted on a cam-operated slide 92, Fig. 13, and over an inclined mandrel 1, and its upper limb is gripped by spring-opened pivoted tongs 4 which are closed by a wedgeshaped lever 6 operated by a cam 9 through lever 8 and rod 7. The lower limb is supported by a member 77 raised into position by a cam 81. lever 80, and rod 79. A camoperated slide 12 is then pushed forward to bring a pair of parallel bending-dies 2, 3 mounted on a laterallyinclined portion thereof, into operative position. The dies are connected by links 10<a>, 11<a> to the slide and are engaged at their rear ends by cranks 13, 14, the pins 13<a>, 14<a> of which are provided with pinions 15, 16, which are oscillated by a pair of racks 17, 18 traversed by cams on the shaft 128. The dies first execute a circular movement so that their grooved rounded ends bend the end of the link over the mandrel and when the cranks pass their dead points the dies are pushed forward so that their concave ends press the ends of the link against the mandrel. The inclination of the dies causes the ends of the link to pass each other and assume the form shown in Fig. 27. The mandrel is then withdrawn by a cam through lever 27, Fig. 8, rod 26, links 24, 25 and lever 23, and the slide 12 is at the same time withdrawn. Pressure substantially at right angles to the faces of the bevelled ends is then applied by a pair of dies a, b, Fig. 27, carried by hammers 34, 35 which are pressed forward in an inclined plane by spring-beams 42, 43 and are normally held in retracted position by cam-retracted stop-bolts 32, 33. The hammers are moved back by cams 41, 40 on shafts 111, 110, the cams also serving to hold them back for a determined period after the bolts have been withdrawn. The carriage 92 is then advanced so that the jaws 82, 83 grip the link and the tongs 4 and member 77 are thereupon withdrawn. A series of blows are then given alternately by pairs of dies c, d, and e, f, which are arranged in a horizontal plane. These dies are carried by hammers 53, 54, 68, 69, which are pressed forward by spring-beams 57, 58, 72, 73, retracted by cams 55, 56, 70, 71 on shafts 112 - - 115, and held in retracted position by simultaneously operated cam-actuated stop-bolts. The stop-bolts for the hammers 68, 69 are longer than those for the hammers 53, 54, so that the hammers 53, 54 are being withdrawn as the hammers 68, 69 move forward. The respective pairs of hammers are coupled together by balancing levers to ensure their meeting in the centre of the machine. The hammers 53, 69 may also be moved laterally against spring bolts 53<a> 69<a>, Fig. 24, during their forward stroke, so as to exert lateral pressure also on the joint as described in Specification 141,319. The ends of the dies are bevelled at g, h to prevent excessive lateral pressure. The carriage 92 is now withdrawn and the tongs 82, 83 are turned so that the completed link faces the operator so as to facilitate insertion of a new blank. For this purpose the jaws, Fig. 13, are carried by bellcrank levers pivoted at 82<a>, 83<a>, to a bolt 84, which is mounted obliquely and is rotated through an angle of 110‹ so that the link is turned in one direction through an angle of 90‹ from the vertical plane and in another direction through an angle of 60‹ from the horizontal plane into the position shown in Fig. 11. The rotation is effected by a cam 103 through lever 102, rod 101, links 99, 100 and crank 98. The jaws are closed by a conical sleeve 85 pushed forward by a camoperated lever 90, rod 89 and bifurcated lever 88. The shafts 112 - - 115 are driven by bevel gear from shafts 110, 110<a>, which are rotated by bevel gear 116<c>, 116<b> from a shaft 117 geared to the main shaft 120. The cam 40 is fixed on the shaft 110 and the cam 41 on a shaft 111 which is driven by bevel gear from the shaft 115. The cam shaft 128 is driven by spur gear through a countershaft from the shaft 117.