Combinations of operations covered by different sub-classes are dealt with in Fulltext... Hierarchy... Expanded...B23P. Combinations of operations covered by any particular sub-class with operations covered by other classes, e.g. with operations involving removal of material, are also dealt with in Fulltext... Hierarchy... Expanded...B23P, except that if the operations covered by the other classes both are subsidiary to and performed in connection with the operations properly covered in a single sub-class of Fulltext... Hierarchy... Expanded...B21 the combination is classified in that sub-class.
Processes of a kind covered by this class but applied to non-metallic materials may be classified here if they are applicable to metal and cannot be classified fully in one other class.
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 (Fulltext... Hierarchy... Expanded...B21L 7/00 takes precedence)
B21L 3/02
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Machines or devices for welding chain links
B21L 3/04
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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, chain links are formed
B21L 5/02
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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
Punching or bending the different parts of the chain links
B21L 9/06
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Sorting, feeding, assembling, riveting, or finishing parts of chains
B21L 9/08
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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 11/02
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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
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
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the ends being interengaged with other parts of the same link
B21L 11/10
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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 (Fulltext... Hierarchy... Expanded...B21L 11/02 takes precedence)
B21L 11/12
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forming bead chains
B21L 11/14
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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