B
SECTION B — PERFORMING OPERATIONS; TRANSPORTING
  
SHAPING
 B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (casting, powder metallurgy B22; shearing B23D; working of metal by the action of a high concentration of electric current B23H; soldering, welding, flame-cutting B23K; other working of metal B23P; punching sheet material in general B26F; processes for changing of physical properties of metals C21D, C22F; electroforming C25D 1/00)
 B21

Note(s)

  1. This class does not cover:
  2. Processes of a kind covered by this class but applied to non-metallic materials are classified in this class if they are applicable to metal and cannot be classified fully in another class.
 B21L
MAKING CHAINS (chains per se F16G)
 B21L 1/00
Making chains or chain links by bending workpieces 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, chain 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 9/08
·  ·  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 11/02
·  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
 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 part 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 15/02
·  Twisting already closed links
 B21L 17/00
Making chains or chain links not covered by one of the preceding main groups (by casting B22D 25/02)
 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