B
SECTION B — PERFORMING OPERATIONS; TRANSPORTING
  
SHAPING
 B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (casting, powder metallurgy B22; shearing B23D; soldering, welding, flame-cutting B23K; miscellaneous metal-working 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. Combinations of operations covered by different sub-classes of class B21 are dealt with in B23P. Combinations of operations covered by any particular sub-class with operations covered by other classes, e.g. with operations involving removal of material, are also dealt with in B23P, except that if the operations covered by the other classes are subsidiary to the operations properly covered in a single sub-class of B21 the combination is classified in that sub-class.
  2. Processes of a kind covered by this class but applied to non-metallic materials may be classified here if they are applicable to metal and cannot be classified fully in one other class.
 B21H
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal B21D)
 B21H

Note(s)

This sub-class includes only rolling operations which are specially adapted for use in the manufacture of particular objects and which, so far as the invention is concerned, are not combined with any different metal-working operation unless the latter is a subsidiary operation performed in the same machine.

 B21H 1/00
Making articles shaped as bodies of revolution (rolling tubes B21B 17/00-B21B 25/00)
 B21H 1/02
·  discs; disc wheels
 B21H 1/04
·  ·  with rim, e.g. railway wheels
 B21H 1/06
·  rings of restricted axial length (extending closed shapes of metal bands by simultaneous rolling at two or more zones B21B 5/00)
 B21H 1/08
·  ·  railway wheel rims
 B21H 1/10
·  ·  rims for pneumatic tyres
 B21H 1/12
·  ·  rings for ball or roller bearings
 B21H 1/14
·  balls, rollers, cone rollers, or like bodies
 B21H 1/16
·  ·  for bearings
 B21H 1/18
·  cylinders, e.g. rolled transversely
 B21H 1/20
·  ·  rolled longitudinally
 B21H 1/22
·  characterised by use of rolls having circumferentially varying profile  [2]
 B21H 3/00
Making helical bodies or bodies having parts of helical shape (helical gears B21H 5/00; forming tubes or tube walls into helical shape B21D 11/06, B21D 15/04)
 B21H 3/02
·  external screw-threads
 B21H 3/04
·  ·  Making by means of profiled rolls
 B21H 3/06
·  ·  Making by means of profiled members other than rolls, e.g. jaws, moved longitudinally or curvilinearly with respect to each other
 B21H 3/08
·  internal screw-threads
 B21H 3/10
·  twist-drills; screw-taps
 B21H 3/12
·  articles with helicoidal surface (bending strip or the like helically B21D 11/06)
 B21H 5/00
Making gear wheels
 B21H 5/02
·  with cylindrical outline
 B21H 5/04
·  bevel gears
 B21H 7/00
Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons (nails, pins B21G 3/30)
 B21H 7/02
·  spades; shovels
 B21H 7/04
·  hoes
 B21H 7/06
·  ploughshares; axes
 B21H 7/08
·  forks; rakes
 B21H 7/10
·  knives; sickles; scythes
 B21H 7/12
·  horse-shoes; articles of like shape, e.g. wear-resisting attachments for shoes
 B21H 7/14
·  knurled articles
 B21H 7/16
·  turbine blades; compressor blades; propeller blades
 B21H 7/18
·  grooved pins; Rolling grooves, e.g. oil grooves, in articles
 B21H 8/00
Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects
 B21H 8/02
·  Rolls of special shape
 B21H 9/00
Feeding arrangements for rolling machines or apparatus manufacturing articles dealt with in this sub-class
 B21H 9/02
·  for screw-rolling machines