# US 10,480,782 B2 · Fire constructions

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- Number: US 10,480,782 B2
- Document ID: US10480782B2
- Status: Granted
- Kind: B2
- Application number: 14/905,921
- Filed: 2014-07-10
- Published: 2016-06-30
- Granted: 2019-11-19
- Earliest claimed: 2013-07-18
- Assignees: Charlton & Jenrick Limited
- Applicants: Charlton & Jenrick Limited
- Inventors: Peter Mintoft
- Web page: https://patentgrep.com/patent/US10480782B2

## CPC

- F23B 60/02: with combustion air supplied through a grate
- F23L 9/00: Passages or apertures for delivering secondary air for completing combustion of fuel (baffles or deflectors in air inlets F23M9/02)
- F23L 9/04: by discharging the air beyond the fire, i.e. nearer the smoke outlet
- F23M 9/02: in air inlets
- F24B 5/02: in or around stoves
- F24B 5/021: {combustion-air circulation}
- F24B 5/025: {Supply of secondary air for completing combustion of fuel}
- F23B: METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL (for combustion of fuels that are solid at room temperatures, but burned in melted form, e.g. candle wax, C11C5/00, F23C, F23D; using solid fuel suspended in air F23C, F23D1/00; using solid fuel suspended in liquids F23C, F23D11/00; using solid fuel together with fluid fuel or with solid fuel suspended in air, simultaneously or alternately, F23C, F23D17/00)
- F23L: SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ({air-supply arrangements for fluent fuels F23C;} firebridges with means for feeding air or steam F23M3/04; baffles or shields with air supply passages F23M9/04); VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS {(dampers and throat restrictors for open fire-places F24; air inlet valves for open fire fronts F24)}; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23M: CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F24B: DOMESTIC STOVES OR RANGES FOR SOLID FUELS (for solid fuels in combination with gaseous fuels, liquid fuels or other kinds of energy supply F24C1/02); IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES

## Abstract

A fire construction (10) comprising a firebox (12) defining a combustion chamber (14) in which fuel (not shown) can be burnt, a first air supply means (16) for delivering air into the combustion chamber (14) to support combustion of fuel therein, and a second air supply means (18) for supplying additional air to support combustion of fuel within the combustion chamber (14), the second air supply means (18) comprising a supply conduit (20) connecting the combustion chamber (14) with an air supply (22), the supply conduit (20) having a cross section (24) that increases as the supply conduit (20) opens into the combustion chamber (14).

## Claims

### Claim 1

A fire construction comprising a firebox defining a combustion chamber in which a fuel can be burnt, a front opening for access to the combustion chamber for the placement of said fuel configured to be closable by a door, a first air supply means for delivering air into the combustion chamber to support combustion of the fuel therein, and a second air supply means for supplying additional air to further support combustion of particulates and other pollutants rising up within the combustion chamber as by-products of primary combustion, the second air supply means comprising a supply conduit connecting the combustion chamber with an air supply, the supply conduit having a cross section that increases as the supply conduit opens into the combustion chamber to have a generally frustoconical flared region at a location above the fuel in the firebox, wherein the fire construction is a residential fireplace.

### Claim 2 (depends on 1)

A fire construction according to claim 1, in which the second air supply means comprises a plurality of supply conduits.

### Claim 3 (depends on 2)

A fire construction according to claim 2, in which the plurality of supply conduits are aligned in a generally linear arrangement.

### Claim 4 (depends on 3)

A fire construction according to claim 3, in which the plurality of supply conduits extend in a generally horizontal arrangement.

### Claim 5 (depends on 2)

A fire construction according to claim 2, in which at least one of the supply conduits opens into the combustion chamber at a location above the fuel in the firebox.

### Claim 6 (depends on 2)

A fire construction according to claim 2, in which the plurality of supply conduits extends across an inner rear surface and/or an inner side surface at a location at or near the top of the inner rear surface and/or the inner side surface.

### Claim 7 (depends on 2)

A fire construction according to claim 2, in which at least one supply conduit is located in each of two opposing side walls of the firebox.

### Claim 8 (depends on 1)

A fire construction according to claim 1, in which the supply conduit extends through a wall of the firebox.

### Claim 9 (depends on 1)

A fire construction according to claim 1, in which the supply conduit is formed as a passage within a wall of the firebox.

### Claim 10 (depends on 1)

A fire construction according to claim 1, in which the supply conduit comprises a body defining a passage located through a wall of the firebox.

### Claim 11 (depends on 1)

A fire construction according claim 1, in which the supply conduit is located in a rear wall of the firebox that defines at least in part an inner rear surface of the firebox.

### Claim 12 (depends on 11)

A fire construction according to claim 11, in which the supply conduit opens into the combustion chamber on the inner rear surface.

### Claim 13 (depends on 12)

A fire construction according to claim 12, in which the supply conduit opens in a recessed region of the inner rear surface.

### Claim 14 (depends on 13)

A fire construction according to claim 13, in which the recessed region comprises an upper, generally straight edge.

### Claim 15 (depends on 13)

A fire construction according to claim 13, in which the recessed region comprises a lower, generally profiled edge that follows the profile of the supply conduit as the supply conduit opens onto the inner rear surface, in generally spaced relation thereto to define the recess around the supply conduit.

### Claim 16 (depends on 11)

A fire construction according to claim 11, in which the supply conduit extends through to protrude from the inner rear surface to extend into the combustion chamber.

### Claim 17

A fire construction according to 1, in which the supply conduit is located in a side wall of the firebox that defines at least in part an inner side surface of the firebox.

### Claim 18 (depends on 17)

A fire construction according to claim 17, in which the supply conduit opens into the combustion chamber on the inner side surface.

### Claim 19 (depends on 17)

A fire construction according to claim 17, in which the supply conduit extends through to protrude from the inner side surface to extend into the combustion chamber.

### Claim 20 (depends on 1)

A fire construction according to claim 1, in which the supply conduit is located in an upper region of a rear wall and/or a side wall.

### Claim 21 (depends on 20)

A fire construction according to claim 20, in which the upper region is at or near the top of the rear wall and/or the side wall.

### Claim 22 (depends on 1)

A fire construction according to claim 1, in which the cross section of the supply conduit increases in the general direction of a longitudinal axis of the supply conduit.

### Claim 23 (depends on 1)

A fire construction according to claim 1, in which the generally frustoconical flared region extends from partway along the length of the supply conduit to the combustion chamber.

### Claim 24 (depends on 1)

A fire construction according to claim 1, in which the supply conduit comprises a region of generally constant cross section from which extends the generally frustoconical flared region.

### Claim 25 (depends on 1)

A fire construction according to claim 1, in which the generally frustoconical flared region has an inner surface that is stepped, to provide at least one stepped increase in cross section.

### Claim 26 (depends on 25)

A fire construction according to claim 25, in which the inner surface comprises a sequence of stepped sections.

### Claim 27 (depends on 26)

A fire construction according to claim 26, in which the sections extend at an angle of between 0° and 90° to a directional axis of the supply conduit.

### Claim 28 (depends on 27)

A fire construction according to claim 27, in which the angle differs between respective step sections.

### Claim 29 (depends on 26)

A fire construction according to claim 26, in which at least one step section extends at an angle of substantially 90° to a directional axis of the supply conduit.

### Claim 30 (depends on 29)

A fire construction according to claim 29, in which other step sections extend at an angle of between 30° and 60° to the directional axis of the supply conduit.

### Claim 31 (depends on 30)

A fire construction according to claim 30, in which other step sections extend at an angle of approximately 45° to said directional axis.

### Claim 32 (depends on 30)

A fire construction according to claim 30, in which the other step sections are adjacent to the said at least one step section.

### Claim 33 (depends on 1)

A fire construction according to claim 1, in which the supply conduit has a generally circular cross section around a directional axis thereof as it extends through the firebox.

### Claim 34 (depends on 1)

A fire construction according to claim 1, in which the supply conduit has an elongate cross section across a direction of extension thereof through the firebox.

### Claim 35 (depends on 34)

A fire construction according to claim 34, in which the supply conduit defines an elongate opening that opens into the combustion chamber.

### Claim 36 (depends on 1)

A fire construction according to claim 1, in which the supply conduit connects the combustion chamber to an air supply externally of the firebox.

### Claim 37 (depends on 36)

A fire construction according to claim 36, in which the air supply is ambient air.

### Claim 38 (depends on 1)

A fire construction according to claim 1, wherein convections in the combustion chamber draw air through the first air supply means and the supply conduit.