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GRATES (inlets for fluidisation air for fluidised bed combustion apparatus F23C 10/20); CLEANING OR RAKING GRATES
Definition statement
This subclass/group covers:

All details of combustion grates, including all relevant accessories and peripheral devices such as driving mechanisms or cooling arrangements for example, independently from the type of solid fuel which is supported and burned on the grate.

References relevant to classification in this subclass
This subclass/group does not cover:
Inlets for fluidisation air for fluidised bed combustion apparatus

Examples of places where the subject matter of this class is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Arrangements or mountings of grates in stoves or ranges
F23B13/02
Arrangements or mountings of grates in incinerators
Informative references
Attention is drawn to the following places, which may be of interest for search:
Arrangements of drying grates in incinerators
Details of drying grates
F26
Details of cooling grates in furnaces or ovens in general
Special rules of classification within this subclass

Subgroups F23H 7/12-F23H 7/18 are not used; all inclined or stepped grates should be classified either in subgroups F23H 7/08 or F23H 7/10.

When classifying in this subclass, add codes F23H 2900/17001 - F23H 2900/09041.

Indexing Codes F23H 2700/001-F23H 2700/009 are not used for classification purpose.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Air
a mixture of gases containing free oxygen and able to promote or support combustion
Primary air
air supplied to the burning fuel in order to liberate combustible gases
Secondary air
air supplied to the combustible gases liberated by the primary air in order to complete their combustion. The term "secondary air" covers "tertiary air" etc.
Ash
means any solid combustion residues, for example remaining in the fuel bed or suspended in the flue gases
Burner
a device by which fluid fuel or solid fuel suspended in air is passed to a combustion space where it burns to produce a self-supporting flame
Combustion
means the direct combination of oxygen gas, e.g. in air and a burnable substance
Combustion chamber
a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame
Combustion zone
the part of the apparatus where the reaction takes place between air and fuel
Flue gases
any gaseous products of combustion
Grate
a perforated surface, e.g. a grid which supports or delimits a bed of burning fuel and serves to supply primary air
Synonyms and Keywords

In patent documents the expression/word "boiler" is often used with the meaning "combustion apparatus".

In patent documents the expression/word "burner" is often used with the meaning "combustion apparatus".

Grates with solid bars
having bars at different levels (double grates F23H 5/00)
References relevant to classification in this group
This subclass/group does not cover:
Double grates
Grates with hollow bars
Double grates
Inclined or stepped grates (inclined travelling grates F23H 11/12)
References relevant to classification in this group
This subclass/group does not cover:
Inclined travelling grates
Revolving-grates; Rocking-grates (F23H 7/00 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
Inclined or stepped grates
Grates rocked as a whole
Definition statement
This subclass/group covers:

All grates somehow moved as a whole, thus including also vibrating grates.

Travelling-grates
Grates not covered by any preceding group
Cleaning arrangements for grates; (not forming part of the grate F23J 1/00); Moving fuel along grate (rocking-grates modified for moving fuel F23H 9/10; for travelling-grates F23H 11/22)
References relevant to classification in this group
This subclass/group does not cover:
Rocking grates modified for moving fuels
Cleaning arrangements for travelling grates
Cleaning arrangements which do not form part of the grate
Details of grates
This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013