|  | 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 Fulltext... Hierarchy... Expanded...F02B; engine fuel-injection pumps Fulltext... Hierarchy... Expanded...F02M; electric discharge pumps Fulltext... Hierarchy... Expanded...H01J 41/00; pumping by electrodynamic action Fulltext... Hierarchy... Expanded...H02N 4/20)

|  | F04 |
Note(s) Combinations of positive-displacement and non-positive-displacement pumps are to be found in the following sub-classes: Fulltext... Hierarchy... Expanded...F04B as a general sub-class for pumps; Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...F04C; non-positive-displacement pumps Fulltext... Hierarchy... Expanded...F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped Fulltext... Hierarchy... Expanded...F04F; crankshafts, crossheads, connecting-rods Fulltext... Hierarchy... Expanded...F16C; flywheels Fulltext... Hierarchy... Expanded...F16F; gearings for interconverting rotary motion and reciprocating motion in general Fulltext... Hierarchy... Expanded...F16H; pistons, piston-rods, cylinders, in general Fulltext... Hierarchy... Expanded...F16J)

|  | F04B |
Note(s) Attention is drawn to the notes preceding class Fulltext... Hierarchy... Expanded...F01, especially as regards the definitions of "machines", "pumps", and 'positive-displacement".

|  | F04C |
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines Fulltext... Hierarchy... Expanded...F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

|  | F04C |
Note(s) Attention is drawn to the notes preceding class Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...F01, especially as regards the definition of the term "pump". 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. Combinations of non-positive-displacement pumps with other pumps are dealt with in sub-class Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...F04D).

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

|  | F04F |
Note(s) Attention is drawn to the notes preceding class Fulltext... Hierarchy... Expanded...F01. 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.