MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS,...
B21H
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B 21 H
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal B 21 D)
Note
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.
rings of restricted axial length (extending closed shapes of metal bands by simultaneous rolling at two or more zones B 21 B 5/00)
1
/
08
•
•
railway wheel rims
1
/
10
•
•
rims for pneumatic tyres
1
/
12
•
•
rings for ball or roller bearings
1
/
14
•
balls, rollers, cone rollers, or like bodies
1
/
16
•
•
for bearings
1
/
18
•
cylinders, e.g. rolled transversely
1
/
20
•
•
rolled longitudinally
1
/
22
•
characterised by use of rolls having circumferentially varying profile [2]
3
/
00
Making helical bodies or bodies having parts of helical shape (helical gears B 21 H 5/00; forming tubes or tube walls into helical shape
B 21 D 11/06, B 21 D 15/04)
3
/
02
•
external screw-threads
3
/
04
•
•
Making by means of profiled rolls
3
/
06
•
•
Making by means of profiled members other than rolls, e.g. jaws, moved longitudinally or curvilinearly with respect to each other
3
/
08
•
internal screw-threads
3
/
10
•
twist-drills; screw-taps
3
/
12
•
articles with helicoidal surface (bending strip or the like helically B 21 D 11/06)
5
/
00
Making gear wheels
5
/
02
•
with cylindrical outline
5
/
04
•
bevel gears
7
/
00
Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons (nails, pins B 21 G 3/30
)
7
/
02
•
spades; shovels
7
/
04
•
hoes
7
/
06
•
ploughshares; axes
7
/
08
•
forks; rakes
7
/
10
•
knives; sickles; scythes
7
/
12
•
horse-shoes; articles of like shape, e.g. wear-resisting attachments for shoes
