B
SECTION B — PERFORMING OPERATIONS; TRANSPORTING
 B01 - 
B07
Subsection index
LIQUID/LIQUID, LIQUID/GAS OR GAS/GAS SEPARATION
Method
General operationsB01D
by centrifugal force, using centrifuges or free-vortex apparatusB01D
using magnetic or electrostatic effectB03C
Apparatus
General operationsB01D
by centrifugal force, using centrifuges or free-vortex apparatusB04B, B04C
using magnetic or electrostatic effectB03C
SOLID/LIQUID OR SOLID/GAS SEPARATION
Method
General operationsB01D
by centrifugal forceB01D
using centrifuges or free-vortex apparatusB01D
using magnetic or electrostatic effectB03C
Apparatus
General operationsB01D
by centrifugal forceB01D
using centrifuges or free-vortex apparatusB04B, B04C
using magnetic or electrostatic effectB03C
SOLID/SOLID SEPARATION
Method
Dry methods
material in bulkB07B
Individual sortingB07C
Screening, sifting, pneumatic sortingB07B
using pneumatic tables or jigsB03B
by magnetic or electrostatic effectB03C
by centrifugal forceB07B
using centrifuges or free-vortex apparatusB07B
Wet methods
General operationsB03B
flotation, differential sedimentationB03D
screeningB07B
Combinations Dry methods - wet methodsB03B
Apparatus
Dry methods
material in bulkB07B
Individual sortingB07C
Screening, sifting, pneumatic sortingB07B
using pneumatic tables or jigsB03B
by magnetic or electrostatic effectB03C
by centrifugal forceB07B
using centrifuges or free-vortex apparatusB04B, B04C
Wet methods
General operationsB03B
flotation, differential sedimentationB03D
screeningB07B
Combinations Dry methods - wet methodsB03B
  
SHAPING
 B21
MECHANICAL 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)
 B21

Note(s)

  1. This class does not cover:
  2. Processes of a kind covered by this class but applied to non-metallic materials are classified in this class if they are applicable to metal and cannot be classified fully in another class.
 B21L
MAKING CHAINS (chains in general F16G)
 B21L
Subclass index
GENERAL METHODS OF WORKING
Chains made from individual links 1/00, 3/00, 7/00, 9/00
Chains with integral links 5/00
METHODS FOR MAKING SPECIAL CHAINS OR PARTS THEREOF 11/00, 13/00
TOOLS FOR MANUFACTURE OR REPAIR 19/00, 21/00
FINISHING 15/00
OTHER MANUFACTURE 17/00
P:50 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 (B21L 3/00, B21L 7/00 take precedence)
 B21L 1/02
·  by bending the ends of the workpieces to abut
 B21L 1/04
·  by bending and interconnecting the ends of the workpieces with or without separate jointing members
P:60 B21L 3/00
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)
 B21L 3/02
·  Machines or devices for welding chain links
 B21L 3/04
·  ·  by making use of forge or pressure welding
P:30 B21L 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
 B21L 5/02
·  in such a way that interconnected links are formed
P:40 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
P:20 B21L 9/00
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)
 B21L 9/02
·  of roller-chain or other plate-link type
 B21L 9/04
·  ·  Punching or bending the different parts of the chain links
 B21L 9/06
·  ·  Sorting, feeding, assembling, riveting, or finishing parts of chains
 B21L 9/08
·  ·  Combining the chain links with auxiliary parts, e.g. welding-on wear-resistant parts
P:10 B21L 11/00
Making chains or chain links of special shape
 B21L 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
 B21L 11/04
·  ·  the ends being pierced or punched to form eyes
 B21L 11/06
·  ·  ·  the workpiece being of thin strip metal
 B21L 11/08
·  ·  the ends being interengaged with other parts of the same link
 B21L 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)
 B21L 11/12
·  Forming bead chains
 B21L 11/14
·  Making chain links with inserted or integrally- formed studs
P:0 B21L 13/00
Making terminal or intermediate chain links of special shape; Making couplings for chains, e.g. swivels, shackles
P:70 B21L 15/00
Finishing or dressing chains or chain links, e.g. removing burr material, calibrating (B21L 9/06 takes precedence)
 B21L 15/02
·  Twisting already closed links
P:80 B21L 17/00
Making chains or chain links not covered by one of main group B21L 1/00-B21L 15/00 (by casting B22D 25/02)
P:100 B21L 19/00
Appurtenances for chain-making not restricted to any particular process
P:90 B21L 21/00
Tools or implements for repairing chains using metal-working operations, e.g. for detaching deformed chain links