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; ion pumps H01J 41/00; electrodynamic pumps 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)

  1. Attention is drawn to the notes preceding class F01, especially as regards the definitions of "machines", "pumps", and 'positive-displacement".
  2. In this sub-class, the term "piston" also covers a plunger.

 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 "machines", "pumps", "rotary-piston machines", "oscillating-piston machines", "co-operating members", and "internal axis".


 F04D
NON-POSITIVE-DISPLACEMENT PUMPS
 F04D

Note(s)

  1. Attention is drawn to the notes preceding class F01, especially as regards the definition of the term "pump".
  2. This sub-class comprises: non-positive-displacement pumps for liquids, for elastic fluids, or for liquids and elastic fluids, whether rotary or not having pure rotation.
  3. 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 (containers or packages with special means for dispensing liquid or semi-liquid contents by internal gaseous pressure B65D 83/14); SIPHONS  [2]
 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.