(0)F04B:3/5:
IPC6
SECTION F - MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS;BLASTING
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
F04B
4/6
<<   >>   F04B027/00 - F04B037/20  

27
/ 00 Multi-cylinder pumps characterised by number or arrangement of cylinders (F 04 B 25/00 takes precedence; control of reciprocating machines or pumps in general F 04 B 49/00)

27
/ 02 • having cylinders arranged oppositely relative to main shaft  

27
/ 04 • having cylinders in star- or fan-arrangement [6]  

27
/ 047 • • with an actuating element at the outer ends of the cylinders [6]  

27
/ 053 • • with an actuating element at the inner ends of the cylinders [6]  

27
/ 06 • • the cylinders being movable, e.g. rotary  

27
/ 067 • • Control [6]  

27
/ 073 • • • by varying the relative eccentricity between two members, e.g. a cam and a drive shaft [6]  

27
/ 08 • having cylinders coaxial with, or parallel or inclined to, main shaft axis  

27
/ 10 • • having stationary cylinders [6]  

27
/ 12 • • • having plural sets of cylinders or pistons [6]  

27
/ 14 • • Control [6]  

27
/ 16 • • • of pumps with stationary cylinders [6]  

27
/ 18 • • • • by varying the relative positions of a swash plate and a cylinder block [6]  

27
/ 20 • • • of pumps with rotary cylinder block [6]  

27
/ 22 • • • • by varying the relative positions of a swash plate and a cylinder block [6]  

27
/ 24 • Control not provided for in a single group of groups F 04 B 27/02 to F 04 B 27/22 [6]  
 

 29
/ 00 (covered by F 04 B 27/06, F 04 B 37/00)
 

 31
/ 00 Free-piston pumps; Systems incorporating such pumps (muscle-driven pumps in which the stroke is not defined by gearing F 04 B 33/00; free-piston combustion engines, free-piston gas generators F 02 B 71/00; systems predominated by prime mover aspects, see the relevant class for the prime mover)
 

 33
/ 00 Pumps actuated by muscle power, e.g. for inflating

33
/ 02 • with intermediate gearing  
 

 35
/ 00 Piston pumps characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for (predominant aspects of the engines or motors, see the relevant classes)

35
/ 01 • the means being mechanical [6]  

35
/ 02 • the means being fluid  

35
/ 04 • the means being electric  

35
/ 06 • Mobile combinations  
 

 37
/ 00 Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F 04 B 25/00 to F 04 B 35/00

37
/ 02 • for evacuating by absorption or adsorption (absorption or adsorption in general B 01 J)  

37
/ 04 • • Selection of specific absorption or adsorption materials  

37
/ 06 • for evacuating by thermal means  

37
/ 08 • • by condensing or freezing, e.g. cryogenic pumps (cold traps B 01 D 8/00)  

37
/ 10 • for special use (F 04 B 37/02, F 04 B 37/06 take precedence)  

37
/ 12 • • to obtain high pressure  

37
/ 14 • • to obtain high vacuum  

37
/ 16 • • • Means for nullifying unswept space  

37
/ 18 • • for specific elastic fluids  

37
/ 20 • • • for wet gases, e.g. wet air  
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