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B21L 1/00
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Making chains or chain links by bending workpieces of rod, wire, or strip to form links of oval or other simple shape |
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B21L 1/02
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Making chains or chain links by bending workpieces of rod, wire, or strip to form links of oval or other simple shape by bending the ends of the workpieces to abut |
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B21L 1/04
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Making chains or chain links by bending workpieces of rod, wire, or strip to form links of oval or other simple shape by bending and interconnecting the ends of the workpieces with or without separate jointing members |
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B21L 3/00
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Making chains or chain links by bending the chain links or link parts and subsequently welding or soldering the abutting ends |
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B21L 3/02
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Machines or devices for welding chain links |
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B21L 3/04
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Machines or devices for welding chain links by making use of forge or pressure welding |
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B21L 5/00
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Making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chain links are formed |
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B21L 5/02
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Making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chain links are formed in such a way that interconnected links are formed |
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B21L 7/00
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Making chains or chain links by cutting single loops or loop-parts from coils, assembling the cut parts and subsequently subjecting same to twisting with or without welding |
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B21L 9/00
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Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains |
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B21L 9/02
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Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains of roller-chain or other plate-link type |
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B21L 9/04
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Punching or bending the different parts of the chain links |
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B21L 9/06
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Sorting, feeding, assembling, riveting, or finishing parts of chains |
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B21L 9/08
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Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts |
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B21L 11/00
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Making chains or chain links of special shape |
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B21L 11/02
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Making chains or chain links of special shape each link being formed of a single member of which both ends are bent or shaped to engage the middle portion of the next link |
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B21L 11/04
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Making chains or chain links of special shape each link being formed of a single member of which both ends are bent or shaped to engage the middle portion of the next link the ends being pierced or punched to form eyes |
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B21L 11/06
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Making chains or chain links of special shape each link being formed of a single member of which both ends are bent or shaped to engage the middle portion of the next link the ends being pierced or punched to form eyes the workpiece being of thin strip metal |
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B21L 11/08
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Making chains or chain links of special shape each link being formed of a single member of which both ends are bent or shaped to engage the middle portion of the next link the ends being interengaged with other parts of the same link |
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B21L 11/10
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Making chains or chain links of special shape the chain links having opposed correspondingly shaped cylindrical and hook-like parts of which one part forms a hinge-like support for the adjacent link |
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B21L 11/12
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Forming bead chains |
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B21L 11/14
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Making chain links with inserted or integrally- formed studs |
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B21L 13/00
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Making terminal or intermediate chain links of special shape; Making couplings for chains, e.g. swivels, shackles |
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B21L 15/00
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Finishing or dressing chains or chain links, e.g. removing burr material, calibrating |
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B21L 15/02
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Twisting already closed links |
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B21L 19/00
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Appurtenances for chain-making not restricted to any particular process |
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B21L 21/00
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Tools or implements for repairing chains using metal-working operations, e.g. for detaching deformed chain links |
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B21L 99/00
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Subject matter not provided for in other groups of this subclass |
