Pilgrim-step feeding mechanisms (B 21 B 21/06 takes precedence)
21
/
06
•
Devices for revolving work between the steps
23
/
00
Tube-rolling not restricted to methods provided for in only one of groups B 21 B 17/00 to B 21 B 21/00, e.g. combined processes (B 21 B 25/00 takes precedence)
25
/
00
Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B 21 B 17/00; Accessories or auxiliary means therefor
25
/
02
•
Guides, supports, or abutments for mandrels, e.g. carriages; Adjusting devices for mandrels
25
/
04
•
Cooling or lubricating mandrels during operation [2]
25
/
06
•
Interchanging mandrels
27
/
00
Rolls (shape of working surfaces required by special processes
B 21 B 1/00); Lubricating, cooling or heating rolls while in use
27
/
02
•
Shape or construction of rolls (for rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects B 21 H 8/02)
27
/
03
•
•
Sleeved rolls [5]
27
/
05
•
•
•
with deflectable sleeves [5]
27
/
06
•
Lubricating, cooling, or heating rolls
27
/
08
•
•
internally
27
/
10
•
•
externally
28
/
00
Maintaining rolls or rolling equipment in effective condition (lubricating, cooling or heating rolls while in use B 21 B 27/06) [2]
28
/
02
•
Maintaining rolls in effective condition, e.g. reconditioning [2]
28
/
04
•
•
while in use, e.g. polishing [2]
29
/
00
Counter-pressure devices acting on rolls to inhibit deflection of same under load, e.g. backing rolls
31
/
00
Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
31
/
02
•
Rolling stand frames; Roll mountings
31
/
04
•
•
with tie rods, e.g. prestressed tie rods
31
/
06
•
•
Fastening stands or frames to foundation, e.g. to the sole plate (in general F 16 M)
31
/
07
•
Adaptation of roll bearings (bearings in general F 16 C) [2]
31
/
08
•
Interchanging rolls, roll mountings, or stand frames [2]
