WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

B21L　MAKING CHAINS (making chains or chain links by casting B22D 25/02; chains in general F16G)

B21L 1/00 Making chains or chain links by bending work-pieces of rod, wire, or strip to form links of oval or other simple shape (B21L 3/00, B21L 7/00 take precedence)

B21L 1/02 ・by bending the ends of the workpieces to abut

B21L 1/04 ・by bending and interconnecting the ends of the workpieces with or without separate jointing members

B21L 3/00 Making chains or chain links by bending the chain links or link parts and subsequently welding or soldering the abutting ends (B21L 7/00 takes precedence)

B21L 3/02 ・Machines or devices for welding chain links

B21L 3/04 ・・by making use of forge or pressure welding

B21L 5/00 Making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chains links are formed

B21L 5/02 ・in such a way that interconnected links are formed

B21L 7/00 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

B21L 9/00 Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains (B21L 1/04, B21L 7/00, B21L 11/14, B21L 13/00 take precedence)

B21L 9/02 ・of roller-chain or other plate-link type

B21L 9/04 ・・Punching or bending the different parts of the chain links

B21L 9/06 ・・Sorting, feeding, assembling, riveting, or finishing parts of chains

B21L 9/065 ・・・{Assembling or disassembling}

B21L 9/08 ・・Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts

B21L 11/00 Making chains or chain links of special shape

B21L 11/005 ・{Making ornamental chains (B21L 11/02 to B21L 11/14 take precedence; ornamental chains A44C)}

B21L 11/02 ・each link being formed of a single member of which both ends are bent or shaped to engage the middle portions of the next link

B21L 11/04 ・・the ends being pierced or punched to form eyes

B21L 11/06 ・・・the workpiece being of thin strip metal

B21L 11/08 ・・the ends being interengaged with other parts of the same link

B21L 11/10 ・the chain links having opposed correspondingly shaped cylindrical and hook-like parts of which one parts forms a hinge-like support for the adjacent link (B21L 11/02 takes precedence)

B21L 11/12 ・forming bead chains

B21L 11/14 ・making chain links with inserted or integrally-formed studs

B21L 13/00 Making terminal or intermediate chain links of special shape; making couplings for chains, e.g. swivels, shackles

B21L 15/00 Finishing or dressing chains or chain links, e.g. removing burr material, calibrating (B21L 9/06 takes precedence)

B21L 15/005 ・{Pre-stretching chains}

B21L 15/02 ・Twisting already closed links

B21L 19/00 Appurtenances for chain-making not restricted to any particular process

B21L 21/00 Tools or implements for repairing chains using metal-working operations. e.g. for detaching deformed chain links

B21L 99/00 Subject matter not provided for in other groups of this subclass