(0)B21L:0/0:
IPC6
SECTION B - PERFORMING OPERATIONS; TRANSPORTING
MAKING CHAINS
B21L
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B 21 L

 MAKING CHAINS (chains in general F 16 G)

 

 

 
 

 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)

1
/ 02 • by bending the ends of the workpieces to abut  

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

 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)

3
/ 02 • Machines or devices for welding chain links  

3
/ 04 • • by making use of forge or pressure welding  
 

 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

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

 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
 

 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)

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

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

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

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

 11
/ 00 Making chains or chain links of special shape

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  

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

11
/ 06 • • • the workpiece being of thin strip metal  

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

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)  

11
/ 12 • Forming bead chains  

11
/ 14 • Making chain links with inserted or integrally- formed studs  
 

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

 15
/ 00 Finishing or dressing chains or chain links, e.g. removing burr material, calibrating (B 21 L 9/06 takes precedence)

15
/ 02 • Twisting already closed links  
 

 17
/ 00 Making chains or chain links not covered by one of the preceding main groups (by casting B 22 D 25/02)
 

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

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