Improvements in Gas Heated Ovens, Chambers, or Furnaces.
Year: 1892

page_text: Date of Application, 28th May, 1892
Complete Specification Left, 28th Feb., 1893-Accepted, 1st Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Gas Heated Ovens, Chambers, or Furnaces.
I, JOSEPH EMERSON DOWSON, M. Inst. C.E. of 3 Great Queen Street, West-
minster in the County of Middlesex do hereby declare the nature of this invention
to be as follows:-
This invention relates to ovens, chambers or furnaces, heated by the combustion
of vapour or gas. The oven, chamber or furnace is, according to this invention
constructed so that the gas and air enter the oven or chamber near the floor level
of the latter; the gas then burns, and after the flame has risen to near the top of
the oven or chamber it is drawn downwards, and the products of combustion pass
through suitable openings into a flue under the floor of the oven or chamber leading
to a chimney. On each side of this flue are two or more passages or channels for
conveying gas and air to the combustion chamber.
In this way a uniform heat may be obtained in the oven, chamber or furnace and
the ingoing air and gas may be heated by the outgoing products of combustion.
The supply of gas and air can be regulated by cocks, valves or dampers of any
suitable kind.
The above arrangement can be applied to rectangular, circular or other shaped-
ovens, chambers or furnaces which can be used for malleable iron, case hardening,
annealing, enamelling, pottery &c. &c.
Pans, cylinders or other receptacles for boiling, evaporating, concentrating
drying roasting &c. can also be heated in this way; a convenient method being to
fix the pan &c. so as to form the top of the oven or chamber instead of this being
roofed over in the usual way.
Dated this 28th day of May 1899
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Improvements in Gas Heated Ovens, Chambers, or Furnaces.
I, JOSEPH EMERSON DOWSON, M. Inst. C.E. of 3 Great Queen Street, West-
minster London do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement :-
This invention relates to the construction of ovens, chambers or furnaces heated
by the combustion of vapour or gas and not by fires in the ordinary way. The
principal feature of the improvements is the relative arrangement of the flues in
the base of the furnace.
The improved furnace may be of any convenient shape or size consistent with
the arrangement of flues hereinafter described.
Figs. 1. 3. 5. 7 show vertical sections and Figs. 2, 4. 6 and 8 sectional plans of
various forms of ovens, chambers or furnaces suitable for the different kinds of
work "hereinafter described. In all these figures a represents the combustion
chamber, the gas flues, c c the air flues, and d the flue for the products of
combustion.
Figs. 1 and 2 refer to an oven or furnace intended to heat pots xx containing
castings which are to be converted into malleable irou. The gas to be burnt
travels along the outermost flues b b and the air for combustion of the gas travels
along the flues c c, parallel to and near the outlet flue d. The gas and air, igniting

page_text: when mingled enter the combustion chamber together through the parts e e and the
flames and products of combustion rise at first towards the roof of the said chamber
and owing to the draught produced by a chimney connected with the outlet flue d,
the flame and products of combustion are drawn downwards through the outlets ff
leading to the flue d. The quantity of gas admitted can be regulated by one or
more cocks or valves, and the admission of air can be regulated by a damper in the
flue leading to the chimney or in any other convenient way.
Figs. 3 and 4 refer to a furnace intended to heat a circular pan w forming the
top of the furnace, said pan being suitable for boiling, evaporating, concentrating,
drying, roasting or other purposes.
A substantially similar arrangement can be used for a conical or other shaped
pan or containing vessel. In this furnace the arrangement of the flues for the
admission of gas and air and for the withdrawal of the products of combustion
follow substantially the same description as is given for Figs. 1 and 2.
Figs. 5 and refer to an oven or furnace intended to be used for heating,
tempering, casehardening, or annealing any suitable material, for brazing tubes of
any suitable kind, or for heating tempering or annealing bands of steel or other
metal, such as are used for saws, measuring tapes and other purposes.
Figs. 7 and 8 refer to an oven or furnace which can be used for the same purposes
as the one shewn in Figs. 5 and 6, the chief difference being that the products of
combustion are made to pass laterally under the air and gas flues and through
additional side flues g g before going to the outlet flue or chimney on top of oven.
The same principle of construction for circulating the products of combustion round
the wall of the furnace may be applied to any of the other furnaces hereinbefore
described.
In Figs. 5, 6, 7 and 8 the relative arrangement of the flues for the admission
of gas and air and the withdrawal of the products of combustion follow substantially
the same description as is given for Figs. 1 and 2.
In all cases the flue d for the products of combustion can be returned once or
more times, and the gas flues bb can be used for air, and the air flues c c can be
used for gas if preferred. The return.flues can be either between the flues and d
or between the flues b and c.
I have mentioned some of the purposes for which the ovens or furnaces described
can be used but I do not restrict myself to these purposes and wish it to be under-
stood that the said ovens or furnaces, or modifications of them can be used for any
purposes for which they may be suitable.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. Ovens, chambers or furnaces having flues for gas, air, and products of com-
bustion arranged substantially as herein described.
2. A furnace having in the top thereof a pan or receptacle for boiling, evaporating,
concentrating, drying roasting or otherwise treating any substance of material by
heat and having thereunder flues arranged substantially as described.
3. An oven, chamber or furnace having in the base thereof, flues for gas, air and
products of combustion the last named flue having on or more returns between the
air flues or between the air and gas flues as herein described.
4. An oven, chamber or furnace having in the base thereof flues for gas, air and
products of combustion the last named being returned laterally under the gas and
air flues and through one or more additional flues outside the wall or walls of the
combustion chamber.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.