Cooperative Patent Classification

CPC Definition - Subclass E21F

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Last Updated Version: 2016.11
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
Definition statement

This place covers:

Auxiliary machines and methods specifically adapted for use in underground mines or in tunnels.

References
Limiting references

This place does not cover:

Machines for cutting, slitting or dislodging

Tunnel excavating machines

Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F)
Definition statement

This place covers:

Ventilation of mines or tunnels.

Distribution of ventilating currents.

References
Limiting references

This place does not cover:

Ventilating rooms or spaces in general

{Ventilation of traffic tunnels (during construction E21F 1/04 - E21F 3/00)}
Definition statement

This place covers:

Specific modes of longitudinal or transversal flow to ensure the renewal of fresh air inside the tunnel:

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Evacuation of fumes caused by a fire:

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References
Limiting references

This place does not cover:

Details of air ducts

Ventilation of traffic tunnels during construction

Ventilators

Informative references

Attention is drawn to the following places, which may be of interest for search:

Preventing escape of fumes using a central system

Railway stations

Railway tunnels

Means permanently installed along the road for removing or neutralising exhaust gases

Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators ({E21F 1/003 takes precedence}; ventilators in general F04D)
Definition statement

This place covers:

  • Construction of ventilating ducts when the type of ventilation is determined by the ducts themselves.
  • Mounting of ventilators:

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References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Ventilators in general

Special rules of classification

If the ventilation is for traffic tunnels, then the document is classified in E21F 1/003

Air doors ({E21F 1/003 takes precedence; air locks E21F 1/145; dam doors E21F 17/12}; doors in general E06B)
Definition statement

This place covers:

Doors that can impede air circulation into a gallery, and can be opened when air circulation is necessary.

Safety doors for avoiding the extension of a fire or of smoke.

References
Limiting references

This place does not cover:

Air locks

Dam doors

Informative references

Attention is drawn to the following places, which may be of interest for search:

Doors in general

Special rules of classification

If the ventilation is for traffic tunnels, then the document is classified in E21F 1/003

Air partitions; Air locks ({E21F 1/003 takes precedence}; dams E21F 17/103; air locks for foundations E02D)
Definition statement

This place covers:

Fixed or adjustable constructions to regulate the flow of air into a gallery or among multiple galleries:

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References
Limiting references

This place does not cover:

Dams

Informative references

Attention is drawn to the following places, which may be of interest for search:

Air locks for foundations

Special rules of classification

If the ventilation is for traffic tunnels, then the document is classified in E21F 1/003

Shaft covers
Definition statement

This place covers:

Covers for ventilation shafts.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Surface sealing of wellbores

Lining of shafts

Cooling or drying of air (air-conditioning rooms or spaces in general F24F)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Air-conditioning rooms or spaces in general

Means or methods for preventing, binding, depositing, or removing dust {(in combination with mining machines E21C 35/22)}; Preventing explosions or fires (dams E21F 17/103; applying liquids or other fluent materials to surfaces in general B05)
Definition statement

This place covers:

Reduction of dust in a mining atmosphere. Any means that can help prevent a fire from starting or from spreading.

References
Limiting references

This place does not cover:

Fire extinguishing equipment

Fire protection in buildings

Dust control in combination with mining machines

Informative references

Attention is drawn to the following places, which may be of interest for search:

Dams

Applying liquids or other fluent materials to surfaces in general

Rock dusting of mines; Depositing other protective substances
Definition statement

This place covers:

Prevention of fires caused by ignition of coal dust and gas. A rock dust usually made of crushed limestone is sprayed to keep down the levels of coal dust.

Fluid barriers or rock dusters made to work by, or at the same time as, shots or explosions
Definition statement

This place covers:

Constructions for confining explosions:

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Drawing-off or depositing dust (dust-removing while drilling E21C 7/00; while slitting E21C 35/22)
Definition statement

This place covers:

Removal of dust from a mine atmosphere by using filters, cyclones or similar:

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References
Limiting references

This place does not cover:

Dust-removing while slitting in mining operations

Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Definition statement

This place covers:

Removal of gases for safety purposes

References
Limiting references

This place does not cover:

Production of coalbed methane

Gasification of coal underground

Devices preventing sparking of machines or apparatus (preventing sparking of electric machines or apparatus H01K, H02K)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Preventing sparking of electric machines or apparatus

Rescue devices or other safety devices, e.g. safety chambers, escape ways (respiratory apparatus A62B 7/00; revival apparatus A62B 33/00; breathing aids for curative purposes A61H 31/00)
Definition statement

This place covers:

Systems and operations for protecting workers in an underground environment in case of accidents, for gaining access to the area of the accident, or for bringing the workers to surface or to a safe environment.

References
Limiting references

This place does not cover:

Alarm devices

Informative references

Attention is drawn to the following places, which may be of interest for search:

Breathing aids for curative purposes

Respiratory apparatus

Revival apparatus

Transport specially adapted to underground conditions (mine cars B61D; transport in general, loading {unless specially adapted to underground conditions} B65G)
Definition statement

This place covers:

Transport of staff, equipment or extracted rocks or minerals in underground operations. The transport can be vertical, inclined or horizontal. It can be continuous by conveyors or discontinuous by shuttle cars.

This main groups and its subgroups also includes the constructive details of scraper chain conveyors for collecting the coal as it is cut in longwall operations.

References
Limiting references

This place does not cover:

Transport in general, loading unless specially adapted to underground conditions

Removal and transport of material extracted during tunnel excavation

Informative references

Attention is drawn to the following places, which may be of interest for search:

Mine cars

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Highwall mining

Method of mining by which a train typically formed by a continuous miner and multiple conveyors acting as pushbeams is propelled into a coal seam from the outside

{Crushing devices specifically for conveying in mines}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Crushing

{Equipment transport systems}
References
Limiting references

This place does not cover:

Transport of machines for slitting or completely freeing the mineral

{Transport of mined mineral} in galleries
Definition statement

This place covers:

Means for transporting mined material to the surface or to some other point in the mine along one or more galleries:

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References
Limiting references

This place does not cover:

Gathering at the working face

Shifting conveyors or other transport devices from one location at the working face to another (guiding mining machines along conveyors for the cut mineral E21C 35/12; in combination with mine roof supports for step-by-step movement E21D 23/00)
Definition statement

This place covers:

Apparatuses for moving conveyors along a gallery as the working faces advances. Self-propelled conveyors are also included:

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References
Limiting references

This place does not cover:

Guiding mining machines along conveyors for the cut mineral

Shifting conveyors in combination with mine roof supports for step-by-step movement

Methods or devices for placing filling-up materials in underground workings (dams E21F 17/103; {chocks made of flexible containers filled with backfilling material E21D 15/483})
Definition statement

This place covers:

Materials for filling up mine galleries and cavities. Machines for transporting and for placing the materials. Machines such as mixing bunkers for producing the filling-up materials that are adapted for use in an underground environment.

References
Limiting references

This place does not cover:

Dams

Chocks made of flexible containers filled with backfilling material

Informative references

Attention is drawn to the following places, which may be of interest for search:

Hydraulic cements

{characterised by the kind or composition of the backfilling material}
References
Limiting references

This place does not cover:

A method or apparatus specific for use in mines must be disclosed in combination with the composition

Informative references

Attention is drawn to the following places, which may be of interest for search:

Compositions of mortars, concrete or artificail stone

Supporting means, e.g. shuttering, for filling-up materials
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Reinforcing elements for concrete cast in-situ for lining tunnels or galleries

Filling-up hydraulically or pneumatically (hydraulic or pneumatic transport devices B65G; pipes, pipe couplings F16L)
References
Limiting references

This place does not cover:

Hydraulic or pneumatic transport devices

Pipes, pipe couplings

Special rules of classification

This group includes mixing bunkers

Drainage (keeping dry foundation sites or other areas in the ground E02D 19/00)
Definition statement

This place covers:

Gathering of water surrounding a subterranean formation. Extraction of water to the outside:

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References
Limiting references

This place does not cover:

Keeping dry foundation sites or other areas in the ground

Waterproofing of tunnels

Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B)
Definition statement

This place covers:

Methods or devices for use in mines or tunnels, not covered elsewhere

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Mine lighting

Tracing profiles of cavities or tunnels

Navigational instruments

Radar systems

Control of position of vehicles

Suspension devices for tubes or the like, e.g. for ventilating ducts (supporting pipes, cables or protective tubing in general F16L 3/00 - F16L 7/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Supporting pipes, cables or protective tubing in general

Installation of cables in walls, ceilings or floors

Dams, e.g. for ventilation
Definition statement

This place covers:

Constructions for sealing off underground volumes, such as inactive galleries.

Modification of mine passages or chambers for storage purposes, especially for liquids or gases (storing fluids in natural or artificial cavities or chambers in the earth B65G 5/00)
References
Limiting references

This place does not cover:

Storing fluids in natural or artificial cavities or chambers in the earth

Excavation of large underground chambers