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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 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 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

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, 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".

having bars at different levels (double grates F23H 5/00)
References relevant to classification in this group
This subgroup does not cover:

Double grates

Inclined { or stepped} grates (inclined travelling grates F23H 11/12)
References relevant to classification in this group
This group does not cover:

Inclined travelling grates

Revolving-grates; Rocking-grates (F23H 7/00 takes precedence)
References relevant to classification in this group
This group does not cover:

Inclined or stepped grates

Grates rocked as a whole
Definition statement
This subgroup covers:

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

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 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

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013