GB253785A - Improvements in the manufacture of weldless chain couplings for railway wagons - Google Patents

Abstract

253,785. Weldless Couplings, Ltd., and Pilot, I. M. Oct. 28, 1925. Forging chains; forging-dies; cutting chains from cruciform and like bars. - In the manufacture of weldless chain couplings from a single billet formed with sets of notches at the centre and near the ends at opposite corners, as described in Specifications 27683/12 and 15588/15, both sets of notches are formed by the same sections of a pair of dies. The dies b, Fig. 4, have recesses e with projections f, by which notches g are formed at the opposite corners near the ends of the billet. A three-pronged marker, Fig. 5, is then employed to mark the position of the other set of notches k, by engaging the prongs l in the recesses g and striking the central prong m with a hammer, the billet being again placed between the dies b and the notches k completed by the projections f. Flat portions are also provided on the dies b for flattening the ends n of the billet. The centre portion h of the billet is then treated in dies, one of which is shown in Fig. 10, for the shaping of the centre link and crown portions of the end links by the recesses r, s, respectively, recesses r<1> receiving the surplus metal. The recesses r are formed to give the sides of the centre link a bowed shape, as shown in Fig, 12, to allow of easy access to the tool for severing the links. The end links are similarly shaped in another pair of dies to the form shown in Fig. 16. After being subjected to a trimming operation for removal of fins, the links are then cut apart in known manner by appropriate tools, and treated in a pair of dies such as shown in Fig. 18 having recesses w to complete the shaping of each link where severed from the adjacent link. recesses w<3> to bring the sides of the centre link parallel and recesses w<1> flattened at w<2> to form flats, as shown in Fig. 23, on the side of one end link allowing of its engagement with a draw-bar hook.