IMPROVEMENTS IN FURNACES WHEN MOVEABLE FIRE BARS ARE USED
Year: 1857

page_text: LETTERS PATENT to John Chanter and. David. Annan, of Bow, in the
County of Middlesex, for the Invention of "IMPROVEMENTS IN FURNACES
WHEN MOVEABLE FIRE BARS ARE USED."
Scaled the 23rd June 1857, and dated the 21st April 1857.
PROVISIONAL SPECIFICATION left by the said John Chanter and David
Annan at the Office of the Commissioners of Patents, with their Petition,
on the 21st April 1857.
We, JOHN CHANTER and DAVID ANNAN, of Bow, in the County of Middle-.
sex, do hereby declare the nature of the Invention for "IMPROVEMENTS IN
FURNACES WHEN MOVEABLE FIRE BARS ARE USED," to be as follows:-
This Invention has for its object improvements in furnaces when moveable
fire bars are used. For these purposes, in order to obtain greater stiffness
of the fire bars when using moveable bars, and yet admit of a larger supply
of air up between them, the fire bars, in place of each being made in one solid
mass or piece, are made comparatively thin, and two together, with a spaco
between them for the passage of air to support combustion. Each two of the
bars are connected at intervals, and their upper edges are made undulating.
in order that the clinkers and cinders may be broken. These bars, in con-
structing a furnace, may be arranged to be partly moveable and partly fixed, or
they may be used so as to constitute only part of the bars of a furnace, and..

page_text: solid bars may be used therewith to constitute the other part of the bars of
a furnace. The movement of the bars of a furnace is to be accomplished by
any of the means heretofore employed when using solid bars, cach in one mass
or piece.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Chanter and David Annan in the Great Seal Patent
Office on the 13th October 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, wc, JOHN
CHANTER and DAVID ANNAN, of Bow, in the County of Middlesex, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of April, in the year of our Lord
One thousand eight hundred and fifty-seven, in the twentieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said John Chanter and David Annan, Her special licence that we, the
said John Chanter and David Annan, our executors, administrators, and
assigns, or such others as we, the said John Chauter and David Annan, our
executors, administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN FURNACES WHEN MOVEABLE
FIRE BARS ARE USED," upon the condition (amongst others) that we, the said
John Chanter and David Anuan; our executors or administrators, by an
instrument in writing under our or their hands and seals, or under the hand
and seal of one of us or them, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said John Chanter, on behalf of myself and
the said David Annan, do hereby declare the nature of tho said Invention,
and in what manner the same is to be performed, to be particularly described
and ascertained in and. by the following statement thereof; that is to say:-
This Invention has for its object improvements in furnaces when moveable
fire bars are used. For these purposes, in order to obtain greater stiffness

page_text: of the fire bars when using moveable bars, and yet admit of a larger supply of
air up between them, the fire bars, in place of each being made in one solid
mass or piece, are made comparatively thin, and two together, with a space
between them for the passage of air to support combustion. Each two of the
bars-are connected at intervals, and their upper edges are made undulating,
in order that the clinkers and cinder may be broken. These bars, in con-
structing a furnace, may be arranged to be partly moveable and partly fixed, or
they may be used so as to constitute only part of the bars of a furnace, and
solid bars may be used therewith to constitute the other part of the bars of
a furnace. The movement of the bars. of a furnace is to be accomplished by
any of the means heretofore employed when using solid bars, each in one mass
or piece.
Having thus stated the nature of our said Invention, we will proceed more
fully to describe the manner of performing the same.
DESCRIPTION OF THE DRAWING.
Figure 1 shows a longitudinal section of a furnace with bars constructed
according to our Invention; Figure 2 is a plan thereof; and Figure 3 is a
transverse section thereof. The other Figures of the Drawing show various
views of the construction of fire bars employed by us, and we would state
that although the Drawing shows the combined use in the same furnace of
double bars with single bars, yet when preferred the whole of the bars used
in a furnace may be double bars. In the several Figures of the Drawing
the same letters are used to refer to the same parts. a, a. are single bars,
which are similar to those which have heretofore been used in furnaces when
moveable bars have been employed; b, b, are double bars, each consisting of
two thin plates or bars, or cach might be made of more than two com-
paratively thin bars or plates cast or formed together, leaving intervals or
spaces for the passage of air between the two or more parts of which a bar
may be formed, and they have also external projections when necessary, in
order to keep them apart from the neighbouring single or double bars used
in the same furnace. By thus casting or forming a fire bar suitable for a
furnace where moveable bars are used, a larger extent of air spaces may be
obtained, and at the same time a compound bar will be stiffer and stronger
than the bars heretofore used where moveable bars are employed. The
apparatus shown in the Drawing for moving the bars is similar to what has
before been employed in like descriptions of furnaces. The upper edges of
the thin plates or bars constituting a compound bar are serrated as heretofore
when single bars have been employed. It is preferred, as heretofore, that

page_text: every alternate bar should be moveable, and that the intermediate bars should
be stationary; but this may be varied.
Having thus described the nature of the said Invention, and the manner of
performing the same, we would have it understood that we we do not confine
ourselves to the precise details;. but what we claim is, the application of
compound bars, such as aro herein described in furnaces where moveable firo
bars are used.
In 'witness whereof, I, the said John Chanter, have hereunto set my
hand and seal, this Eighteenth day of September, in the year of our
Lord One thousand eight hundred and fifty-seven.
Witness,
S. CARPMAEL..
JOHN. CHANTER. (L.B.)