|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

|  | F01 - F04 |
Subsection index
MACHINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F04C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F04B
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
ENGINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F03C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F03C
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
PUMPS |
positive displacement |
rotary or oscillating piston | F04C
reciprocating piston or other | F04B
non-positive displacement | F04D

LIGHTING; HEATING

|  | F27 |
FURNACES; KILNS; OVENS; RETORTS (specially adapted for a purpose covered by a single other class and specifically mentioned in that class, see the class in question, e.g. bakery ovens Fulltext... Hierarchy... Expanded...A21B, glass melting furnaces Fulltext... Hierarchy... Expanded...C03B, coke or gas-making apparatus Fulltext... Hierarchy... Expanded...C10B, Fulltext... Hierarchy... Expanded...C10J, apparatus for cracking hydrocarbons Fulltext... Hierarchy... Expanded...C10G, blast furnaces Fulltext... Hierarchy... Expanded...C21B, converters for making steel Fulltext... Hierarchy... Expanded...C21C, furnaces for heat treatment of metal Fulltext... Hierarchy... Expanded...C21D; furnaces for electroslag or arc remelting of metals Fulltext... Hierarchy... Expanded...C22B 9/00; enamelling ovens Fulltext... Hierarchy... Expanded...C23D; combustion apparatus Fulltext... Hierarchy... Expanded...F23; electric heating Fulltext... Hierarchy... Expanded...H05B) [4]

|  | F27 |
Note(s) This class covers: furnaces, kilns, ovens, retorts, open sintering apparatus and other similar apparatus for heat treatment of materials or articles, and details or accessories therefor, in general; the arrangement of electrical heating elements in or on furnaces. This class does not cover: combustion apparatus per se, i.e. apparatus for direct combination of oxygen gas and a burnable substance; [7] electrical heating elements per se; processes carried on within the furnaces. In this class, the following term is used with the meaning indicated: "furnaces" covers kilns, ovens, or retorts.

|  | F27B |
FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS

|  | F27B |
Note(s) Attention is drawn to the references and Notes following the title of class Fulltext... Hierarchy... Expanded...F27 and the Note (3) of section H.

|  | F27B |
Subclass index
FURNACES WITH STATIONARY CHARGE |
Shaft furnaces | 1/00
Horizontal furnaces | 3/00, 5/00
Bell-type furnaces | 11/00
With progression of heating | 13/00
Crucible furnaces, tank furnaces | 14/00
STATIONARY FURNACES WITH MECHANICALLY-MOVED CHARGE | 9/00
ROTARY FURNACES | 7/00, 13/00
OTHER FURNACES; COMBINATIONS | 15/00, 17/00; 19/00
OPEN SINTERING OR LIKE APPARATUS | 21/00

P:40 |  | F27B 1/00 |
Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite Fulltext... Hierarchy... Expanded...C04B 2/00)

P:90 |  | F27B 3/00 |
Hearth-type furnaces, e.g. of reverberatory type (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F27B 9/00-F27B 15/00, Fulltext... Hierarchy... Expanded...F27B 21/00 take precedence); Electric arc furnaces [4]

|  | F27B 3/08 |
· | heated electrically, e.g. electric arc furnaces, with or without any other source of heat

|  | F27B 3/10 |
· | Details, accessories, or equipment, e.g. dust-collectors, peculiar to hearth-type furnaces

|  | F27B 3/20 |
· · | Arrangements of heating devices

P:60 |  | F27B 5/00 |
Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated (Fulltext... Hierarchy... Expanded...F27B 9/00 takes precedence)

P:10 |  | F27B 7/00 |
Rotary-drum furnaces, i.e. horizontal or slightly inclined

|  | F27B 7/20 |
· | Details, accessories, or equipment peculiar to rotary-drum furnaces

P:20 |  | F27B 9/00 |
Furnaces through which the charge is moved mechanically, e.g. of tunnel type (Fulltext... Hierarchy... Expanded...F27B 7/00 takes precedence); Similar furnaces in which the charge moves by gravity

|  | F27B 9/30 |
· | Details, accessories, or equipment peculiar to furnaces of these types

P:70 |  | F27B 11/00 |
Bell-type furnaces (for treating metal strips or wire Fulltext... Hierarchy... Expanded...C21D 9/54)

P:50 |  | F27B 13/00 |
Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge

P:80 |  | F27B 14/00 |
Crucible or pot furnaces; Tank furnaces [4]

P:30 |  | F27B 15/00 |
Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion (combustion apparatus in which combustion takes place in a fluidised bed of fuel or other particles Fulltext... Hierarchy... Expanded...F23C 10/00)

P:100 |  | F27B 17/00 |
Furnaces of a kind not covered by any of groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F27B 1/00-F27B 15/00 (structural combinations of furnaces Fulltext... Hierarchy... Expanded...F27B 19/00)

P:0 |  | F27B 19/00 |
Combinations of different kinds of furnaces that are not all covered by any single one of main groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F27B 1/00-F27B 17/00

P:110 |  | F27B 21/00 |
Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction