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| SECTION B– PERFORMING OPERATIONS; TRANSPORTING |
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| B 21 | MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (casting, powder metallurgy B 22; shearing B 23 D; working of metal by the action of a high concentration of electric current B 23 H; soldering, welding, flame-cutting B 23 K; other working of metal B 23 P; punching sheet material in general B 26 F; processes for changing of physical properties of metals C 21 D, C 22 F; electroforming C 25 D 1/00) |
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| B 21 L | MAKING CHAINS (chains in general F 16 G) |
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1/ | 00 | Making chains or chain links by bending workpieces of rod, wire, or strip to form links of oval or other simple shape (B 21 L 3/00, B 21 L 7/00 take precedence) |
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1/ | 02 | . | by bending the ends of the workpieces to abut |
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1/ | 04 | . | by bending and interconnecting the ends of the workpieces with or without separate jointing members |
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3/ | 00 | Making chains or chain links by bending the chain links or link parts and subsequently welding or soldering the abutting ends (B 21 L 7/00 takes precedence) |
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3/ | 02 | . | Machines or devices for welding chain links |
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3/ | 04 | . | . | by making use of forge or pressure welding |
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5/ | 00 | 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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5/ | 02 | . | in such a way that interconnected links are formed |
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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 |
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9/ | 00 | Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains (B 21 L 1/04, B 21 L 7/00, B 21 L 11/14, B 21 L 13/00 take precedence) |
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9/ | 02 | . | of roller-chain or other plate-link type |
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9/ | 04 | . | . | Punching or bending the different parts of the chain links |
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9/ | 06 | . | . | Sorting, feeding, assembling, riveting, or finishing parts of chains |
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9/ | 08 | . | . | Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts |
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11/ | 00 | Making chains or chain links of special shape |
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11/ | 02 | . | 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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11/ | 04 | . | . | the ends being pierced or punched to form eyes |
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11/ | 06 | . | . | . | the workpiece being of thin strip metal |
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11/ | 08 | . | . | the ends being interengaged with other parts of the same link |
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11/ | 10 | . | 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 (B 21 L 11/02 takes precedence) |
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11/ | 12 | . | Forming bead chains |
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11/ | 14 | . | Making chain links with inserted or integrally- formed studs |
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13/ | 00 | Making terminal or intermediate chain links of special shape; Making couplings for chains, e.g. swivels, shackles |
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15/ | 00 | Finishing or dressing chains or chain links, e.g. removing burr material, calibrating (B 21 L 9/06 takes precedence) |
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15/ | 02 | . | Twisting already closed links |
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17/ | 00 | Making chains or chain links not covered by one of the preceding main groups (by casting B 22 D 25/02) |
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19/ | 00 | Appurtenances for chain-making not restricted to any particular process |
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21/ | 00 | Tools or implements for repairing chains using metal-working operations, e.g. for detaching deformed chain links |
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