IMPROVEMENTS IN FURNACES WHEN MOVEABLE 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 BARS ARE USED."
Scaled the 23rd September 1857, and dated the 10th July 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 10th July 1857.
We, JOHN CHANTER and DAVID ANNAN, of Bow, in the County of Middlesex,
do hereby declare the nature of the Invention for "IMPROVEMENTS IN FURNACES
WHEN MOVEABLE BARS ARE USED," to be as follows:-
This Invention has for its object improvements in furnaces when moveable
bars are used. Heretofore in using moveable bars in furnaces they have
been of a suitable length to extend from end to end of a furnace, hence when
a furnace has been of considerable length it has been necessary to make cach
bar of such strength as to bear the friction and resistance of the movement to
and fro, by reason of which, thin bars and comparatively extensive air space
between them have not been practically attainable. Now, the object of our
Invention is to construct long furnaces with moveable bars in two or more
lengths, and to give motion to the two or more lengths of such moveable bars
either together or independently, by which means comparatively thin bars may

page_text: For these
be employed with comparatively large air space between them.
purposes each length of the moveable bars (and it is preferred that every
alternate bar of a furnace should be moveable) is cast with two projections, or
a hollow on the under edge, suitable for receiving a rocker between them or in
the hollow; and when two or more rockers are used to give motion to two or
more lengths of moving bars in the same furnace, such rockers may be com-
bined together and worked by one rocking lever, or the rocker of the front
lengths of the moveable bars may be worked by a separate lever from the
rocker or rockers by which the more backward lengths of the bars are
actuated.
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 5th November 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JoHN
CHANTER and DAVID ANNAN, of Bow, in the County of Middlesox, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Tenth day of July, in the year of our Lord One
thousand eight hundred and fifty-seven, in the twenty-first 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 Chanter and David Annan, our exccutors,
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 BARS
ARE USED," upon the condition (amongst others) that we, the said John
Chanter and David Annan, our executors or administrators, by an instrument
in writing under our or their hands and seals, or under the hand and scal
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.

page_text: NOW KNOW YE, that I, the said John Chanter, on behalf of myself and
the said David Annan, do hereby declare the nature of the 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.
bars are used. Heretofore in using moveable bars in furnaces they have been
of a suitable length to extend from end to end of a furnace, hence when a
furnace has been of considerable length it has been necessary to make each
bar of such strength as to bear the friction and resistance of the movement to
and fro, by reason of which, thin bars and comparatively extensive air space
between them have not been practically attainable. Now, the object of our
Invention is to construct long furnaces with moveable bars in two or more
lengths, and to give motion to the two or more lengths of such moveable bars
either together or independently, by which means comparatively thin bars may
be employed with comparatively large air space between them. For these
purposes each length of the moveable bars (and it is preferred that every
alternate bar of a furnace should be moveable) is cast with two projections or
a hollow on the under edge, suitable for receiving a rocker between them or
in the hollow; and when two or more rockers are used to give motion to two
or more lengths of moving bars in the same furnace, such rockers may be
combined together and worked by one rocking lever, or the rocker of the
front lengths of the moveable bars may be worked by a separate lever from
the rocker or rockers by which the. more backward lengths of the bars are
actuated.
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 shews a longitudinal section of part of a furnace where two'
lengths of fire bars are used, and such bars may be all single bars, or part or
all may be double or compound bars, such as were described in the Specifica-
tion of a previous Patent granted to us, and bearing date the 21st day of April
1857. When it is desired, more than two sets of fire bars may be used in
the length of the furnace, particularly when the furnace is required to be of
considerable length, it is preferred that every alternate bar in each set should
be moveable, and the intermediate bars should be stationary, but this may be
varied if desired. The arrangement of apparatus shewn in the Drawing for
each set of bars is such as heretofore has been used when using one length of
bars only in a furnace; but the arrangement of apparatus for giving a to-and-

page_text: motion to the bars of a furnace may be varied. In the arrangement shewn
the moveable bars in both sets are simultaneously put in motion by one lever
handle to which the connecting rod is attached, but if desired, each set may
be arranged to be actuated independently of the other. a, a, are the bars,
which rest on suitable bearers at their ends, as shewn, and the alternate bars 5
of cach set are moved to and fro by means of their rocking bearers or rocking
shafts d, e, such rocking shafts being connected by links f, and they both
receive motion from a lever to which the connecting rod c is attached.
Figure 2 shews a longitudinal section, and Figure 3 a plan, of part of
another furnace where the front ends of the fire bars, in place of resting on a 1
bearer, such as is shewn in the previous Figure, rests on a bearer g³, forming
part of the front plate g, and such plate g is made with a series of holes or
slots for the passage of air, as is indicated by the arrow.
Having thus described the nature of our said Invention, and the manner of
performing the same, we would have it understood that what we claim is, the
arranging the fire bars of furnaces where moveable fire bars are used in two
or more sets, as herein described.
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.S.)