| IPC 7 English version |
| B21H-B21H00902 |
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| SECTION B – PERFORMING OPERATIONS; TRANSPORTING |
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| B 21 | 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) |
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| B 21 H | MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal B21D) |
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| Note |
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| This subclass covers only rolling operations which are specially adapted for use in the manufacture of particular objects and which are not essentially combined with any different metal-working operation unless the latter is a subsidiary operation performed in the same machine. |
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1/ | 00 | Making articles shaped as bodies of revolution (rolling tubes B21B 17/00 to B21B 25/00) |
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1/ | 02 | . | discs; disc wheels |
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1/ | 04 | . | . | with rim, e.g. railway wheels |
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1/ | 06 | . | rings of restricted axial length (extending closed shapes of metal bands by simultaneous rolling at two or more zones B21B 5/00) |
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1/ | 08 | . | . | railway wheel rims |
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1/ | 10 | . | . | rims for pneumatic tyres |
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1/ | 12 | . | . | rings for ball or roller bearings |
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1/ | 14 | . | balls, rollers, cone rollers, or like bodies |
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1/ | 16 | . | . | for bearings |
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1/ | 18 | . | cylinders, e.g. rolled transversely |
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1/ | 20 | . | . | rolled longitudinally |
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1/ | 22 | . | characterised by use of rolls having circumferentially varying profile [2] |
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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) |
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3/ | 02 | . | external screw-threads |
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3/ | 04 | . | . | Making by means of profiled rolls |
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3/ | 06 | . | . | Making by means of profiled members other than rolls, e.g. jaws, moved longitudinally or curvilinearly with respect to each other |
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3/ | 08 | . | internal screw-threads |
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3/ | 10 | . | twist-drills; screw-taps |
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3/ | 12 | . | articles with helicoidal surface (bending strip or the like helically B21D 11/06) |
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5/ | 00 | Making gear wheels |
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5/ | 02 | . | with cylindrical outline |
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5/ | 04 | . | bevel gears |
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7/ | 00 | Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons (nails, pins B21G 3/30) |
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7/ | 02 | . | spades; shovels |
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7/ | 04 | . | hoes |
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7/ | 06 | . | ploughshares; axes |
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7/ | 08 | . | forks; rakes |
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7/ | 10 | . | knives; sickles; scythes |
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7/ | 12 | . | horse-shoes; articles of like shape, e.g. wear-resisting attachments for shoes |
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7/ | 14 | . | knurled articles |
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7/ | 16 | . | turbine blades; compressor blades; propeller blades |
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7/ | 18 | . | grooved pins; Rolling grooves, e.g. oil grooves, in articles |
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8/ | 00 | Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects |
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8/ | 02 | . | Rolls of special shape |
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9/ | 00 | Feeding arrangements for rolling machines or apparatus manufacturing articles dealt with in this subclass |
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9/ | 02 | . | for screw-rolling machines |
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