IMPROVEMENTS IN GRATES AND STOVES FOR BURNING ANTHRACITE AND OTHER COALS AND PARTIALLY. CONSUMING ITS OWN SMOKE
Year: 1881

page_text: LETTERS PATENT to Robert Crane, of 3, Stockwell Park Road, Clapham,
London, S.W., Engineer, for an Invention of "IMPROVEMENTS IN GRATES
AND STOVES FOR BURNING ANTHRACITE AND OTHER COALS AND PARTIALLY.
CONSUMING ITS OWN SMOKE."
PROVISIONAL SPECIFICATION left by the said Robert Crane at the Office
of the Commissioners of Patents on the 7th March 1881.
ROBERT CRANE, of 3, Stockwell Park Road, Clapham, London, S.W., Engineer.
"IMPROVEMENTS IN GRATES AND STOVES FOR BURNING ANTHRACITE AND OTHER
COALS AND PARTIALLY CONSUMING ITS OWN SMOKE."
A grate having the same appearance as an ordinary open fire register, but
constructed with a flue on each side passing down under the bottom of the fire &
thence up the back. A well under the bottom to receive the ashes. A raised hearth.
formed up to the under side of grate & made perfectly tight with wrought
or cast iron or any other material, sliding or swing doors being fitted for cleaning
out the ashes.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert Crane in the Great Seal Patent Office on the 6th September
1881.
ROBERT CRANE, of 3, Stockwell Park Road, Clapham, London, S.W., Engineer.
"IMPROVEMENTS IN GRATES AND STOVES FOR BURNING ANTHRACITE AND OTHER
COALS AND PARTIALLY CONSUMING ITS OWN SMOKE"
This Invention has for its object improvements in grates and stoves for burning
anthracite and other coals and partially consuming its own smoke.

page_text: The Drawing hereunto annexed shews various views of a grate or stove
constructed according to my Invention.
Figure 1 is a front elevation of the grate or stove; Figure 2 is a vertical section
of the same through the line A, A, Figure 1; and Figure 3, a horizontal section
through the line B, B, Figure 1.
It will be seen that in appearance the grate resembles an ordinary open fire
grate, so much so that the principle can be readily applied to most of those already
made.
On each side of the fire are side flues SF, the inner faces of which are protected
by fire lumps marked SL, or they might be formed of cast iron plates, whichever
may be most convenient. The other portions of the flue may be of cast or wrought
iron plates, or they might be formed by bricking up when setting the stove. In
the Drawing the front of the flues is shewn to be faced with ornamental tiles T.
The back of the grate is formed to carry a thick fire lump marked BL, and above
this is a hinged register door marked RD. Above this register door there are
openings at the sides into the top of the side flues SF. At the bottom of the side
flues there are also openings of about equal area below the level of the fire bars and
towards the front of the fire. The bottom part of the back below the fire bars and
below the fire brick lump B L, is also cut away to the width of the fire. This
opening leads directly into a flue behind the grate and so to the chimney. The
front of the ash.pit is entirely closed by a door or doors, which may be hinged or
sliding or simply made to pull out. It is also necessary to form an ash pit A to a
depth of about 3 to 6 inches directly under the fire and about the size of the bottom
grating. The front of the fire grate may be made to any desired form, either.
straight, curved, or splayed as desired.
When the register door is closed any products of combustion rising upwards from
the fire enter the side flues at the top, pass downwards through these flues enter the
space below the fire bars, and passing across this space enter the back flue and so pass
to the chimney. The flue below the fire bars and the back flue also serve to induce
a current of air to play directly on to the fire, thereby creating a greater draught and
avoiding the necessity of using a blower.
The fire box and flues are fitted together complete, and may be fixed with or
without brickwork in the usual opening provided for a fire place. The horizontal
plate which closes the top of the grate is made sufficiently strong to carry 5 or 6
inches of brickwork, and is made good to the back and to the side flue plates. The
angles between the sides of the grate and the brickwork forming the recess in
which the grate is fixed may either be filled up with brick rubbish or may be left
open for fresh air ducts. Fresh warm air can then be admitted from them into the
room through an opening above the top flue plate.
Having thus described the nature of my Invention, and the manner of performing
the same, I would have it understood that I claim the construction of grates or
stoves substantially as hereinbefore described and illustrated in the Drawing
annexed.
In witness whereof, I, the said Robert Crane, have hereunto set my hand
and seal, this Second day of September, in the year of our Lord One
thousand eight hundred and eighty-one.