F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
ENGINES AND PUMPS
 F04
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS (charging or scavenging combustion engines by pumps F02B; engine fuel-injection pumps F02M; electric discharge pumps H01J 41/00; pumping by electrodynamic action H02N 4/20)
 F04

Note(s)

Combinations of positive-displacement and non-positive-displacement pumps are to be found in the following sub-classes: F04B as a general sub-class for pumps; F04C, D in respect of matter peculiar to these sub-classes.

 F04B
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F; crankshafts, crossheads, connecting-rods F16C; flywheels F16F; gearings for interconverting rotary motion and reciprocating motion in general F16H; pistons, piston-rods, cylinders, in general F16J)
 F04B

Note(s)

Attention is drawn to the notes preceding class F01, especially as regards the definitions of "machines", "pumps", and 'positive-displacement".


 F04C
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
 F04C

Note(s)

Attention is drawn to the notes preceding class F01, especially as regards the definitions of "machine", "pump", "rotary-piston machine", "oscillating-piston machine", "co-operating members", and "internal axis".


 F04D
NON-POSITIVE-DISPLACEMENT PUMPS
 F04D

Note(s)

Attention is drawn to the notes preceding class F01, especially as regards the definition of the term "pump".

This sub-class comprises:

  1. non-positive-displacement pumps for liquids, for elastic fluids, or for liquids and elastic fluids, whether rotary or not having pure rotation.
  2. Combinations of non-positive-displacement pumps with other pumps are dealt with in sub-class F04B, except that the use of such other pumps for priming or boosting non-positive-displacement pumps is dealt with in the present sub-class (F04D).


 F04F
PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
 F04F

Note(s)

  1. Attention is drawn to the notes preceding class F01.
  2. Combinations of pumps belonging to this sub-class with other pumps are only classified in this sub-class if such other pumps are fore pumps of diffusion pumps.