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MAKING CHAINS (making chains or chain links by casting B22D 25/02; chains in general F16G)
Definition statement
This subclass/group covers:

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

References relevant to classification in this subclass
This subclass/group does not cover:
Making chains or chain links by casting
Forging members of endless tracks
Informative references
Attention is drawn to the following places, which may be of interest for search:
Chains in general
Making chains or chain links by bending work-pieces 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 subclass/group 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.

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Source: GB644151

References relevant to classification in this group
This subclass/group does not cover:
Making chains or chain links by bending and subsequently welding or soldering the abutting ends.
Making chains or chain links by bending into a coil and cutting single loops or loop parts from said coil
by bending the ends of the workpieces to abut
Definition statement
This subclass/group covers:

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

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Source: US4694644

by bending and interconnecting the ends of the workpieces with or without separate jointing members
Definition statement
This subclass/group covers:

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

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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 subclass/group 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.

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Source: EP2219803

References relevant to classification in this group
This subclass/group 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
Machines or devices for welding chain links
Definition statement
This subclass/group covers:

Methods and devices for welding chain links.

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Source: DE10331400

by making use of forge or pressure welding
Definition statement
This subclass/group covers:

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

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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 subclass/group 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 subclass/group 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.

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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 subclass/group 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.

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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 subclass/group covers:

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

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Source: US4118995

Informative references
Attention is drawn to the following places, which may be of interest for search:
Endless traction elements in conveyors
Load carrier chains
B65G14/40
Making chains or chain links by bending work-pieces and interconnecting the ends.
Making chains or chain links by bending and cutting single loops or loop parts from coils.
Making chains or chain links with inserted or integrally formed studs
Making terminal or intermediate chain links of special shapes.
of roller-chain or other plate-link type
Definition statement
This subclass/group covers:

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

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Source. US2007032325

Punching or bending the different parts of the chain links
Definition statement
This subclass/group covers:

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

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Source: FR2795474

Informative references
Attention is drawn to the following places, which may be of interest for search:
Making belts from metal sheet
Forging members of endless tracks
Sorting, feeding, assembling, riveting, or finishing parts of chains
Definition statement
This subclass/group 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.

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Source: EP1803511

{Assembling or disassembling}
Definition statement
This subclass/group covers:

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

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Source: JP2008188598

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

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Source: US6068568

Making chains or chain links of special shape
Definition statement
This subclass/group covers:

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

{Making ornamental chains (B21L 11/02 to B21L 11/14 take precedence; ornamental chains A44C) }
Definition statement
This subclass/group covers:

Methods and devices for making ornamental chains.

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Source: US20090241598

References relevant to classification in this group
This subclass/group does not cover:
Making chains or chain links by bending the ends of work-pieces to abut
Making chains or chain links with inserted or integrally formed studs
Informative references
Attention is drawn to the following places, which may be of interest for search:
Ornamental chains
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 subclass/group 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.

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Source: EP0774086

the ends being pierced or punched to form eyes
Definition statement
This subclass/group covers:

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

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Source: DE19715707

the workpiece being of thin strip metal
Definition statement
This subclass/group covers:

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

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Source: US3869856

Informative references
Attention is drawn to the following places, which may be of interest for search:
Making belts from metal sheet
the ends being interengaged with other parts of the same link
Definition statement
This subclass/group covers:

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

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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 subclass/group 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.

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Source: WO2007017107

References relevant to classification in this group
This subclass/group does not cover:
Making chains or chain links, wherein each link engages the middle portion of the next link.
forming bead chains
Definition statement
This subclass/group covers:

Methods and devices for making bead chains.

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Source: EP0565379

making chain links with inserted or integrally-formed studs
Definition statement
This subclass/group covers:

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

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Source: EP0736348

Making terminal or intermediate chain links of special shape; making couplings for chains, e.g. swivels, shackles
Definition statement
This subclass/group covers:

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

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Source: US6230961

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

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

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Source: GB1130249; EP1938916

Informative references
Attention is drawn to the following places, which may be of interest for search:
Heat treatments for chain links
Twisting already closed links
Definition statement
This subclass/group covers:

Methods and devices for twisting already closed links.

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Source: WO0228567

Appurtenances for chain-making not restricted to any particular process
Definition statement
This subclass/group covers:

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

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Source: WO0236288

Tools or implements for repairing chains using metal-working operations. e.g. for detaching deformed chain links
Definition statement
This subclass/group covers:

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

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Source: US20110179761

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.
Subject matter not provided for in other groups of this subclass
Definition statement
This subclass/group covers:

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

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013