Improvements in Means for Ensuring Combustion in Furnaces and Domestic Fire Grates.
Year: 1896

page_text: Date of Application, 16th Dec., 1896
Complete Specification Left, 10th Sept., 1897-Accepted, 16th Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in Means for Ensuring Combustion in Furnaces and
Domestic Fire Grates.
We, GEORGE NAYLER, of. 3 Chestnut Villas, Ryelands Street, Hereford, and
ARTHUR NAYLER, of 58 Chandos Street, Hereford, Engineers, both in the County
of Hereford, do hereby declare the nature of this invention to be as follows:-
Our invention relates to an improved fire retort applicable to steam boilers but
more especially to domestic grate fires where coke is used as fuel and has for
its object to effect more complete combustion of the fuel by the provision of a clear
draught and a large area of air admission.
Our invention consists in an improved fire retort of cast iron or other metal
or refractory material which supports the surrounding fuel and is formed hollow
so as to give a large area of air admission, and is provided laterally with air inlets
into the inner hollow space which are so designed as to preclude the deposit of the
surrounding fuel therein or the diminution of the air supply there-through while
air outlets from the inner hollow space to the surrounding fire are provided as
slots which are bevelled outwardly on all sides.
In carrying our invention into effect we provide our retort from cast iron or
other metal or refractory material of a hollow dome or other similar shape having
its base open and having at its lower outer edge a series of air admission channels
which project outwardly and may be opened upon the underside so as to admit
air along their entire length to the hollow interior from which it may issue through
longitudinal slots to the surrounding fire. Air outlets may be provided upon the
retort of any suitable shape and number, each outlet however being preferably
bevelled towards the outer edges so that their width upon the outer side may be
so small as to prevent to a considerable extent the passage of the fuel there-
through.
We may provide our retort integral with the grate in which case we may
dispense with in lependent fire bars.
Dated this 16th day of December 1896
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents.
Improvements in Means for Ensuring Combustion in Furnaces and
Domestic Fire Grates.
We, GEORGE NAYLER, of 3 Chestnut Villas, Ryelands Street, Hereford, and
ARTHUR NAYLER, of 58 Chandos Street, Hereford, Engineers, both of the County
Di Q71

page_text: of Hereford, 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:-
Our invention relates to means for insuring combustion in furnaces, and is
more especially applicable to domestic fire grates where coke or Anthracite smoke-
less coal is used as fuel, and has for its object to effect more complete combustion
of the fuel by provision of a clear draft, and a large area of air admission..
Our invention consists as hereinafter described of a casing or retort of cast
iron or other metal or refractory material, which supports. the surrounding fuel
and is formed hollow so as to give a large area of air admission, and is provided
laterally with air inlets into the inner hollow space which are so designed as to preclude
the deposition of the surrounding fuel therein or the diminution of the air supply
there-through, while air outlets from the inner hollow space to the surrounding
fire are provided as slots which are bevelled outwardly on all sides.
Our invention is illustrated in the accompanying drawings, in which,
Figure 1 is a front elevation of a casing or retort made in accordance with the
present invention, while
Figure 2 is a section upon the line a b Figure 1.
Figure 3 is a plan corresponding to Figure 1, and
Figure 4 is a detail elevation of the cap E (Figure 1).
In carrying our invention into effect we provide our casing or retort, from cast
iron or other metal or refractory material of a hollow dome or other similar shape
having its base A¹ laterally extended and enlarged as at A to form an inlet for
the admission of air, which passes to the hollow interior of the casing or retort A
and issues out through longitudinal slots C that are provided as air outlets to the
surrounding fire. These air outlets may be provided upon the retort of any
suitable shape and number, but preferably bevelled towards their outer edges so
that their width upon the outer side may be so small as to prevent to a, con-
siderable extent the passage of the fuel there-through.
Arranged upon the exterior of the casing or retort A and intermediate of the
longitudinal slots or outlets C are provided longitudinal ribs D which while
strengthening the casing maintain the surrounding fire from close contact with the
wall. These longitudinal ribs terminate at a distance below the top of the casing
or retort and are preferably of a length corresponding to the intermediate longi-
tudinal slots, while a semicircular shaped cap E of fire-clay; or other refractory
or infusible material is provided upon the top of the casing and is supported by
the upper edges of the longitudinal ribs, suitable shaped recesses being provided
upon its interior to receive the edges of the longitudinal ribs and holes E¹ or
apertures being provided to coincide with the longitudinal slots in the casing.
This cap A prevents the fusion of the metal dome of the iron casing which
would otherwise likely result from the high temperature in the interior of the nre.
It will be understood that the casing or retort is placed upon the fire bars of
the grate with its air inlet A facing the front bars so that air issues from the
lateral inlet A2, and from below, into the hollow interior and out from the
internal recesses to the surrounding fire so that thereby a large quantity of air is
permitted a clear passage and effects the complete combustion of the fuel.
We may instead of providing one air admission channel arrange a number which
project outwardly on two or more sides.
We may provide our casing or retort integral with the grate in which case we
may dispense with independent fire bars.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. Improvements in means for insuring combustion in furnaces and domestic

page_text: fire grates substantially as herein before described and as illustrated in the accom-
panving drawings.
2. Means for insuring combustion in furnaces and domestic fire grates consisting
of a casing or retort having at its base a laterally extended air inlet, and
longitudinal air outlets or slots upon its periphery, and longitudinal ribs inter-.
mediate thereof substantially as hereinbefore described, and illustrated.
3. Means for insuring combustion in furnaces and domestic fire grates consisting
of a casing or retort having at its base a lateral extended air inlet longitudinal
air outlets or slots upon its periphery, longitudinal ribs intermediate thereof and
terminating below the top of the casing, and a cap of refractory material as
hereinbefore described and illustrated.
Dated this 10th day of September 1897
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents.