CPC Definition - Subclass B21L

Last Updated Version: 2017.08
MAKING METAL CHAINS (making chains or chain links by casting B22D 25/02; chains in general F16G)
Definition statement

This place covers:

Methods and devices for making metal chains essentially by metal forming operations (e.g. bending, cutting, assembling), eventually by welding.

References
Limiting references

This place does not cover:

Forging members of endless tracks

B21K 23/02

Making chains or chain links by casting

B22D 25/02

Informative references

Attention is drawn to the following places, which may be of interest for search:

Chains in general

F16G

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)
Definition statement

This place covers:

Methods and devices for making chains or chain links by bending work-pieces of rod, wire or strip to form links of oval or other simple shape.

media0.jpg

Source: GB644151

References
Limiting references

This place does not cover:

Making chains or chain links by bending and subsequently welding or soldering the abutting ends.

B21L 3/00

Making chains or chain links by bending into a coil and cutting single loops or loop parts from said coil

B21L 7/00

by bending the ends of the workpieces to abut
Definition statement

This place covers:

Methods and devices for making chains or chain links by bending the ends of workpieces to abut.

media1.jpg

Source: US4694644

by bending and interconnecting the ends of the workpieces with or without separate jointing members
Definition statement

This place covers:

Methods and devices for making chains or chain links by bending and interconnecting the ends of workpieces with or without separate jointing members.

media2.jpg

Source: GB2324163

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)
Definition statement

This place covers:

Methods and devices for making chains or chain links by bending the chain links or link parts and subsequently welding or soldering the abutting ends.

media3.jpg

Source: EP2219803

References
Limiting references

This place does not cover:

Making chains or chain links by bending into a coil and cutting single loops or loop parts from coil and subsequently welding

B21L 7/00

Machines or devices for welding chain links
Definition statement

This place covers:

Methods and devices for welding chain links.

media4.jpg

Source: DE10331400

by making use of forge or pressure welding
Definition statement

This place covers:

Methods and devices for welding chain links by making use of forge or pressure welding.

media5.jpg

Source: GB689391

Making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chains links are formed
Definition statement

This place covers:

Methods and devices for making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chains links are formed.

in such a way that interconnected links are formed
Definition statement

This place covers:

Methods and devices for making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chains links are formed in an interconnected manner.

media6.jpg

Source: GB361952

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
Definition statement

This place covers:

Methods and devices for 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.

media7.jpg

Source: US6389790

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)
Definition statement

This place covers:

Methods and devices for making chains or chain links, the links being composed of two or more different parts, e.g. drive chains.

media8.jpg

Source: US4118995

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Making chains or chain links by bending work-pieces and interconnecting the ends.

B21L 1/04

Making chains or chain links by bending and cutting single loops or loop parts from coils.

B21L 7/00

Making chains or chain links with inserted or integrally formed studs

B21L 11/14

Making terminal or intermediate chain links of special shapes.

B21L 13/00

Load carrier chains

B65G14/40

Endless traction elements in conveyors

B65G 17/08

of roller-chain or other plate-link type
Definition statement

This place covers:

Methods and devices for making roller-chains or other plate-link type chains.

media9.jpg

Source. US2007032325

Punching or bending the different parts of the chain links
Definition statement

This place covers:

Methods and devices for punching or bending the different parts of the chain links.

media10.jpg

Source: FR2795474

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Making belts from metal sheet

B21D 53/14

Forging members of endless tracks

B21K 23/02

Sorting, feeding, assembling, riveting, or finishing parts of chains
Definition statement

This place covers:

Methods and devices for sorting, feeding, assembling, riveting, or finishing parts of chains of the type being composed of two or more different parts.

media11.jpg

Source: EP1803511

{Assembling or disassembling}
Definition statement

This place covers:

Methods and devices for assembling or disassembling parts of chains of the type being composed of two or more different parts.

media12.jpg

Source: JP2008188598

Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts
Definition statement

This place covers:

Methods and devices for making chains of the type being composed of two or more different parts, wherein the chain links are combined with auxiliary parts, e.g. welded-on wear-resistant parts.

media13.jpg

Source: US6068568

Making chains or chain links of special shape
Definition statement

This place covers:

Methods and devices for making chains or chain links of special shape.

{Making ornamental chains (B21L 11/02 - B21L 11/14 take precedence; ornamental chains A44C)}
Definition statement

This place covers:

Methods and devices for making ornamental chains.

media14.jpg

Source: US20090241598

References
Limiting references

This place does not cover:

Making chains or chain links by bending the ends of work-pieces to abut

B21L 11/02

Making chains or chain links with inserted or integrally formed studs

B21L 11/14

Informative references

Attention is drawn to the following places, which may be of interest for search:

Ornamental chains

A44C

each link being formed of a single member of which both ends are bent or shaped to engage the middle portions of the next link
Definition statement

This place covers:

Methods and devices for making chains or chain links, wherein each link is formed of a single member of which both ends are bent or shaped to engage the middle portions of the next link.

media15.jpg

Source: EP0774086

the ends being pierced or punched to form eyes
Definition statement

This place covers:

Methods and devices for making chains or chain links, wherein the ends of the links are pierced or punched to form eyes.

media16.jpg

Source: DE19715707

the workpiece being of thin strip metal
Definition statement

This place covers:

Methods and devices for making chains or chain links starting from a thin strip of metal.

media17.jpg

Source: US3869856

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Making belts from metal sheet

B21D 53/14

the ends being interengaged with other parts of the same link
Definition statement

This place covers:

Methods and devices for making chains or chain links, wherein ends are interengaged with other parts of the same link.

media18.jpg

Source: WO0246613

the chain links having opposed correspondingly shaped cylindrical and hook-like parts of which one parts forms a hinge-like support for the adjacent link (B21L 11/02 takes precedence)
Definition statement

This place covers:

Methods and devices for making chains or chain links wherein the chain links have opposed correspondingly shaped cylindrical and hook-like parts of which one parts forms a hinge-like support for the adjacent link.

media19.jpg

Source: WO2007017107

References
Limiting references

This place does not cover:

Making chains or chain links, wherein each link engages the middle portion of the next link.

B21L 11/02

Forming bead chains
Definition statement

This place covers:

Methods and devices for making bead chains.

media20.jpg

Source: EP0565379

Making chain links with inserted or integrally-formed studs
Definition statement

This place covers:

Methods and devices for making links with inserted or integrally-formed studs.

media21.jpg

Source: EP0736348

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

This place covers:

Methods and devices for making terminal or intermediate chain links of special shape or making couplings for chains, e.g. swivels, shackles.

media22.jpg

Source: US6230961

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

This place covers:

Methods and devices for finishing (e.g. pre-stressing) or dressing chains or chain links, e.g. removing burr material, calibrating.

media23.jpg media24.jpg

Source: GB1130249; EP1938916

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Heat treatments for chain links

C21D 9/0087

Twisting already closed links
Definition statement

This place covers:

Methods and devices for twisting already closed links.

media25.jpg

Source: WO0228567

Appurtenances for chain-making not restricted to any particular process
Definition statement

This place covers:

Appurtenances for chain-making not restricted to any particular process, like e.g. chain feeding or cleaning arrangements.

media26.jpg

Source: WO0236288

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

This place covers:

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

media27.jpg

Source: US20110179761

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Hand tools for positioning and assembling or detaching sprocket chains, endless tracks or antiskid chains by press fit.

B25B 27/22

Subject matter not provided for in other groups of this subclass
Definition statement

This place covers:

Methods and devices for making chains or chain links not provided for in the groups B21L 1/00 - B21L 21/00.