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IPC 7
B21L-B21L02100

SECTION B – PERFORMING OPERATIONS; TRANSPORTING


B 21MECHANICAL 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)


B 21 LMAKING CHAINS (chains in general F16G)


Subclass Index

GENERAL METHODS OF WORKING 

Chains made from individual links 

B21L 1/00, B21L 3/00, B21L 7/00, B21L 9/00 

Chains with integral links 

B21L 5/00 

METHODS FOR MAKING SPECIAL CHAINS OR PARTS THEREOF 

B21L 11/00, B21L 13/00 

TOOLS FOR MANUFACTURE OR REPAIR 

B21L 19/00, B21L 21/00 

FINISHING 

B21L 15/00 

OTHER MANUFACTURE 

B21L 17/00 



1/

00Making 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)

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/

00Making 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)

3/

02.Machines or devices for welding chain links

3/

04..by making use of forge or pressure welding


5/

00Making 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/

00Making 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/

00Making 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)

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/

00Making 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 (B21L 11/02 takes precedence)

11/

12.Forming bead chains

11/

14.Making chain links with inserted or integrally- formed studs


13/

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


15/

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

15/

02.Twisting already closed links


17/

00Making chains or chain links not covered by one of the preceding main groups (by casting B22D 25/02)


19/

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


21/

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

  
 

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