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
 B23
MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR (punching, perforating, making articles by processing sheet metal, tubes, or profiles B21D; wire-working B21F; making pins, needles, or nails B21G; making chains B21L; grinding B24)
 B23

Note(s)

  1. This class covers:
    • operations not provided for in any other class;
    • combinations of operations covered by different subclasses of classes B21-B24, which combinations are covered by subclass B23P, with the exception of subsidiary operations performed in conjunction with main operations covered by a single subclass;
    • features, specific to machine tools, which relate to a requirement or problem of a nature which is not peculiar to a particular kind of machine tool, e.g. feeding work, which are covered by subclass B23Q, although the realisation of these features may differ according to the kind of machine tool concerned. The said subclass covers such features, in general, even if the feature or a specific function, in any particular case, is to some extent peculiar to, or is claimed only for, machine tools designed for one particular operation; only in exceptional cases are such features classified in the subclass for the machine tool concerned. Certain features of this general nature are, however, referred to subclasses relating to particular metal-working operations, especially B23B, in which case the subclasses in question are not restricted, in respect of those features, to the kind of machine tool with which they are primarily concerned.
  2. In this class, the following terms or expressions are used with the meanings indicated:
    • "metal-working" covers the working of other materials unless the context requires otherwise;
    • "kind of operations" and similar expressions relate to such metal-working operations as boring, drilling, milling and grinding;
    • "kind of machine" means a machine designed for a particular kind of metal-working operation (e.g. a lathe);
    • "form of machine" means a machine of a particular kind adapted or arranged for a particular way of working or for particular work, e.g. face-plate lathe, tailstock lathe, turret lathe;
    • "different machines" covers different forms of machines for performing the same type of metal-working operation, e.g. vertical and horizontal boring machines.
  3. If details, components, or accessories have no essential feature specific to machine tools, the more general class, e.g. F16, takes precedence.
 B23F
MAKING GEARS OR TOOTHED RACKS (by stamping B21D; by rolling B21H; by forging or pressing B21K; by casting B22; arrangements for copying or controlling B23Q; machines or devices for grinding or polishing, in general B24B)
 B23F

Note(s)

  1. This subclass covers:
    • the use of methods or apparatus specially designed to produce accurately the shapes of gear teeth which are essential for proper intermeshing of toothed gearing elements to ensure the required relative motions;
    • the use of similar methods or apparatus in the production of other articles of toothed or like form, e.g. dog clutches, splined shafts, milling cutters.
  2. This subclass does not cover the production of such other articles of toothed or like form using methods or apparatus other than those mentioned under Note (1) above.
  3. In this subclass, the following terms or expressions are used with the meanings indicated:
    • "gear teeth" covers the teeth or lobes of other accurately-intermeshing members having relative movement of a similar kind, such as rotors of rotary pumps and blowers;
    • "profile" may include the outline of both faces or only one face of a tooth, or the opposing faces of adjacent teeth;
    • "straight" means that a tooth as a whole (ignoring any curvature of the tooth-face alone, e.g. crowning) is straight in the direction of its length, for example as seen in the direction of a radius of a spur wheel. It accordingly includes the teeth of helical gears and of the normal type of bevel gear;
    • "broach-milling" means milling with a rotary cutter having a number of teeth of progressively increasing depth or width.
 B23F
Subclass index
MAKING GEAR TEETH
General methods 1/00, 3/00, 17/00
Making teeth with special shape 5/00, 7/00, 9/00, 15/00, 17/00
Finishing 19/00
Tools; accessories 21/00; 23/00
MAKING WORMS
Methods 13/00
Worm wheels 11/00
Accessories 23/00
MAKING OTHER GEARING WHEELS OF SPECIAL TYPE 15/00
P:50 B23F 1/00
Making gear teeth by tools of which the profile matches the profile of the required surface (special adaptations for making curved teeth B23F 9/00)
P:60 B23F 3/00
Making gear teeth involving copying operations controlled by templates having a profile which matches that of the required tooth face or part thereof or a copy thereof to a different scale (copying systems or devices per se B23Q 35/00)
P:70 B23F 5/00
Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made
P:0 B23F 7/00
Making herring-bone gear teeth
P:10 B23F 9/00
Making gears having teeth curved in their longitudinal direction
P:20 B23F 11/00
Making worm wheels, e.g. by hobbing
P:30 B23F 13/00
Making worms by methods essentially requiring the use of machines of the gear-cutting type (making screw-thread B23G)
P:40 B23F 15/00
Methods or machines for making gear wheels of special kinds, not covered by groups B23F 7/00-B23F 13/00
P:80 B23F 17/00
Special methods or machines for making gear teeth, not covered by groups B23F 1/00-B23F 15/00
P:90 B23F 19/00
Finishing gear teeth by other tools than those used for manufacturing gear teeth
P:100 B23F 21/00
Tools specially adapted for use in machines for manufacturing gear teeth
P:110 B23F 23/00
Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines (accessories or equipment not restricted to gear-cutting machines B23Q; tool-guiding mechanisms, see the relevant groups for making gear teeth)