Patent GB-587879-A (GB)
Title: Stud links and stud link chains and method of making same
IPC: B21L11/14
Filed: 1942-03-18
Abstract: 587,879. Making chains. LUTTS, C. G., and LEAHY, A. M. March 18, 1942, No. 3617. Convention date, April 15, 1941. [Classes 83 (ii) and 83 (iv)] Uniting by fusion ; thermo-aluminic processes. Stud chain links are made from half links with bevelled end faces which when placed in juxtaposition form welding channels so that the ends may be filled with weld metal by electric arc, acetylene or thermo-aluminic welding. In electric welding, the end of a fusible metal electrode may be submerged beneath the surface of granular material such as a fusible silicate applied to the parts. A U-shaped halflink 32 made from rolled stock with longitudinal fibres may be upset at its ends between a die 34 and punch 36 to form outward and inward projections 38, 40 with bevelled faces. The bevels may be single or double and may form V- or U-shaped grooves when the parts are abutted. The gap between the projections 40 may be wide enough to receive another link and when the two half-links are placed together, the gap may then be filled with a block 50 having U-grooves 52 in alignment with the grooves formed between the bevelled edges. In another form, the ends may be upset so that the inward projections abut each other, in which case interlinking is effected with one of the parts in open U-form or the half-link may be spread while hot to receive another half-link. In a further form, inward projections only are formed and the bevel may be formed throughout the perimeter of the ends. Bevel-ended U-shaped links 31 may also be used, Fig. 11, the ends being abutted and engaging the curved ends of inner and outer blocks 68, 70, the blocks having U-grooves in alignment with the grooves formed by the bevelled ends. After the links are welded by filling the grooves with weld metal, the outward projections are removed, preferably by a flame cutter. In making the chains, units may be used consisting of a pair of half-links linked together or a complete link with a half-link linked to each end thereof. Such complete links may also be made as previously described. A number of such units may be welded in one operation. Complete links of three-part units may be placed in vertical grooves 84 in a table 82 and the half-links 56 arranged horizontally on the table as shown in Fig. 16, so that their welding grooves are in alignment. For double bevels, the joined parts are reversed and welded on the other side. The projections 38 are then cut off. The units may be welded together progressively by passing them through a cruciform aperture 94 in a table 90 with one halflink 100 resting on the surface in contact with a half-link 102 of the next unit, the complete link 104 of which rests in a groove 96 in the table 90. After completing the weld in the upper surface of the half-links, the parts 100, 102, 104 are reversed so that the link 104 rests in the opposite groove 96 in the table and welding on the reverse side is then effected and the outward projections then cut off. In joining the parts by thermo-aluminic welding, the parts are preheated to redness and placed on a metal plate 114 and over the sides and at the ends of the V-groove are placed refractory bricks 110, 112 to receive the thermic-mixture which is then ignited.