A Grate Bottom for Burning Smokeless Coals in Ordinary Open Fire Grates.
Year: 1897

page_text: Date of Application, 1st Jan., 1897-Accepted, 27th Mar., 1897
COMPLETE SPECIFICATION.
A Grate Bottom for Burning Smokeless Coals in Ordinary Open
Fire Grates.
WILLIAM HELLIER, Hot Water and Gas Engineer, 41 Duke Street Manchester
Square in the County of Middlesex 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:—
My invention relates to means of ensuring in open fire grates the draught
through the mass of fuel necessary for the combustion of smokeless fuel such as
anthracite coal or coke and it consists of a sort of false bottom for the grate
constructed of draught inlet sections or bars each of such a form and so separated
from each other as to project upwards into the mass and each provided with an
opening or openings extending vertically through it so as to form channels conveying
the air into the midst of the mass.
The invention is illustrated in the accompanying drawings forming part of this
specification wherein Figure 1 is a vertical cross sectional elevation of a few
of the sections forming the false grate bottom and Figure 2 is a top plan of one of
said sections.
The false grate bottom is formed of draught inlet sections A each somewhat in
the form of a fish-bellied furnace bar inverted, that is to say of deep wedge-like
form in cross section broad at the base and narrow at top and of hogged or
straight form longitudinally and each formed with a central through aperture B
also of wedge form broad at the base and narrow at top said opening extending as
nearly as possible the full length of the section and being for the sake of strength
divided by a cross web a.
The sectious or bars are cast or moulded of iron or
fireclay and with side lugs 6 to form distance pieces. These lugs are provided at
both sides in case of need in order to fit the extreme sections between the cheeks of
the grate, but the lugs at one side are usually broken off so that the distances
between the sections are equal only to the one set of lugs. In some cases it may be
preferable not to break off the lugs in which case the intervening space between the
sections will be so much the greater.
The false bottom thus formed by the juxtaposed sections A rests loose upon the
ordinary grate bottom C so as to be easily removable if required and the sections A
extend from front to back thereof whilst the proportions are such that the
apertures B are directly over apertures c between the bars of the grate bottom C
so what whilst said apertures are too narrow to admit fuel any ash entering will
fall quite through to the ash-tray or hearth below the grate C, whilst the spaces
between the sections A are also directly over other apertures c' of the grate
bottom C so as also to allow ash to fall through. Owing to the spacing and
tapered cross-sectional form of the sections A the fuel fills up the intermediate
spaces and the apertures B thus form air draught channels leading up into the
midst of the mass.
It will be obvious that in new grates the ordinary grating C might be omitted,
the sections A simply resting on bearer bars at front and back.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
The herein described draught admitting false bottom for open firegrates

page_text: constructed of vertically apertured sections substantially of the form and spaced
in the manner and for the purpose specified.
Dated this 1st day of January 1897.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.