B21L MAKING METAL CHAINS (making chains or chain links by casting B22D25/02; chains in general F16G)
Introduced: September 1968
Description
B21L covers mechanical processes and machinery for manufacturing metal chains without substantial material removal. This subclass encompasses chain fabrication methods including welding, forming, and assembling of chain links, along with associated equipment such as linking machines, welding apparatus, and quality control devices. Typical applications include production of conveyor chains, lifting chains, and decorative chains from ferrous and non-ferrous metals. Excluded are drawing operations for wire or rod preparation (covered under B21B) and operations that involve significant material removal such as cutting or grinding of finished chain components.
Title
Titles differ between systems:
IPC: MAKING METAL CHAINS
CPC: MAKING METAL CHAINS (making chains or chain links by casting B22D25/02; chains in general F16G)
Full Title
Full titles differ between systems:
MAKING METAL CHAINS
MAKING METAL CHAINS (making chains or chain links by casting B22D25/02; chains in general F16G)
IPC and CPC are identically structured here. All 11 subcodes exist in both systems.
5 shared codes have differing titles between IPC and CPC.
Child Classifications
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- 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 (B21L3/00, B21L7/00 take precedence) IPC+CPC Available in IPC and CPC
- B21L 13/00 Making terminal or intermediate chain links of special shape; Making couplings for chains, e.g. swivels, shackles IPC+CPC Available in IPC and CPC
- B21L 15/00 Finishing or dressing chains or chain links, e.g. removing burr material, calibrating (B21L9/06 takes precedence) +1 CPC IPC+CPC Available in IPC and CPC
- B21L 19/00 Appurtenances for chain-making not restricted to any particular process IPC+CPC Available in IPC and CPC
- B21L 21/00 Tools or implements for repairing chains using metal-working operations, e.g. for detaching deformed chain links IPC+CPC Available in IPC and CPC
- B21L 3/00 Making chains or chain links by bending the chain links or link parts and subsequently welding or soldering the abutting ends (B21L7/00 takes precedence) IPC+CPC Available in IPC and CPC
- B21L 5/00 Making chains or chain links by working the starting material in such a way that integral, i.e. jointless, chains links are formed IPC+CPC Available in IPC and CPC
- 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 IPC+CPC Available in IPC and CPC
- B21L 9/00 Making chains or chain links, the links being composed of two or more different parts, e.g. drive chains (B21L1/04, B21L7/00, B21L11/14, B21L13/00 take precedence) IPC+CPC Available in IPC and CPC
- B21L 99/00 Subject matter not provided for in other groups of this subclass since 2009 IPC+CPC Available in IPC and CPC