IMPROVEMENTS IN STEAM BOILERS AND IN THE FURNACE DOORS AND FIRE BRIDGES OF STEAM BOILERS
Year: 1868

page_text: LETTERS PATENT to James
Foundry, in Wigan, in the
Taylor, the younger, of Water Heys
County of Lancaster, for the Invention
of "IMPROVEMENTS IN STEAM BOILERS AND IN THE FURNACE DOORS AND
FIRE BRIDGES OF STEAM BOILERS."
PROVISIONAL SPECIFICATION left by the said James Taylor at the
Office of the Commissioners of Patents, with his Petition, on the
6th November 1868.
I. JAMES TAYLOR, the younger, of Water Heys Foundry, in Wigan,
in the County of Lancaster, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN STEAM BOILERS AND IN THE FURNACE DOORS
AND FIRE BRIDGES OF STEAM BOILERS," to be as follows:-
The first part of my improvements relates to longitudinal tubular
or marine boilers, and consists in the application to the furnaces of such
boilers of rotary furnace or travelling bars. In carrying out this part
of my Invention I cause the said bars (constructed in the form of an
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page_text: endless chain) to enter the fire-box through a suitable, opening in front
of the said fire-box, and after passing through the centre of the said
fire-box from the front to the back thereof (instead of causing the
said bars to return through the said fire-box as
through the said fire-box as has been attempted
heretofore. but without success). I form a suitable opening in and
through the fire-box and down through the bottom of the boiler below
the fire-bridge, through which opening I cause the bars to pass down
into and through a space below the boiler, and so back to enter the
herein-before mentioned opening in front of the fire-box.
The second part of my said improvements relates to the furnace
doors of steam boilers, and consists in making them hollow and so
constructing the said furnace doors as that they may receive and contain
water supplied either from the boilers themselves, to which they are
attached, or from
or from some cistern, whereby the fire is prevented from
producing the injurious effects
injurious effects upon such furnace doors as it has
heretofore produced.
The third part of my said improvements relates to the fire-bridges of
steam boilers, and consists in forming them hollow, and each of these
hollow tubular fire-bridges is to be so connected with the boiler to which
it belongs, and so secured to cach side of the flue thereof, as that the
water from the boiler may have a clear passage through the said fire-
bridge, whereby instead of being burned away by the action of the
fire as heretofore, the said fire-bridge itself becomes a generator of steam,
and may be easily cleaned out when required.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Taylor in the Great Seal Patent Office
on the 6th May 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
TAYLOR, the younger, of Water Heys Foundry, in Wigan, in the
County of Lancaster, send greeting.
WHEREAS Her most Excellent
Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of November, in the year
of our Lord One thousand
eight hundred
eight
thirty-second year of Her reign, did, for
and sixty-eight, in the
Herself, Her heirs and
Herself, Her

page_text: successors, give and grant unto me, the said James Taylor, the
younger, Her special licence that I, the said James Taylor, the
younger, my executors, administrators, and assigns, or such others
as I, the said James Taylor, the younger, my 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 STEAM BOILERS
AND IN THE FURNACE DOORS AND FIRE BRIDGES OF STEAM BOILERS," -upon
the condition (amongst others) that I, the said James Taylor, the
younger, my executors. or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, 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 James Taylor, the younger, do
hereby declare the nature of my said Invention. and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement in writing. reference being had to
the accompanying Drawings, and to the letters and figures marked
thereon (that is to say):-
My Inyention relates to improvements in the application to the
furnaces of longitudinal tubular and marine boilers of rotary travelling
furnace bars joined together so as to form an endless chain. I am
aware that rotary travelling bars in the form of an endless chain have
been heretofore applied to externally fired boilers, and in particular that
a Patent (No. 9067) was granted on the
Fourth day of September, in
being carried
the year 1841. to John Juckes for the same; but these furnaces were
very expensive to manufacture in consequence of the bars
on rollers, and the said travelling bars could not be applied with success
to internally fired tubular or marine boilers in consequence of the rollers
taking up so much space in the fire-box as to materially interfere with
and obstruct the draught, and also in consequence of the liability of the
said bars to become burnt. Now by my Invention I obviate these
objections by doing away with the rollers for carrying the travelling
bars, and instead thereof I make use of either the ends of the bolts or

page_text: joint pins. and also of the nuts on the other ends thereof, or the under
sides of the bars themselves, and longitudinal slides or grooves attached
to the sides of the fire-box as the means of supporting the bars, on their
passage through the said fire-box, thereby allowing sufficient space for
the passage of air up to and between the said bars. In Cornish and
other similar tubular boilers according to my Invention, 1 carry the bars
(after they have passed through the fire-box from the front to the back
thereof) down through the bottom of the fire-box into and through a
space below the boiler in order to get the bars back to re-enter the
fire-box.
My said Invention also relates to improvements in the construction of
the furnace doors of steam boilers, and consists in making the said
furnace doors hollow so that they may contain water, whereby the fire
is prevented from producing injurious effects upon the said furnace
doors.
My said Invention also relates to improvements in the construction of
the fire-bridges of steam boilers, and consists in 'making each of the
said fire-bridges hollow, to be so connected to its boiler as that the water
in the boiler may freely pass through the said fire-bridge, whereby
instead of the fire-bridge becoming burnt and injured by the fire it
becomes itself a useful generator of steam.
And in order that my said Invention may be fully understood and
readily put in practice, I will now proceed to describe the same with the
aid of the accompanying Drawings (which are drawn to the scale of one
half of an inch to one foot, except Figure X., which is drawn to the
scale of one inch and a half to one foot) in the several Figures of which
similar letters of reference indicate corresponding parts.
Figure 1. represents an elevation in section of the furnace of a
longitudinal externally fired boiler, Figure II. a cross section. and
Figure III. a ground plan of the same; Figure IV. represents an
elevation in section of the furnace of an internally fired tubular or
Cornish boiler, Figure V. a cross section, and Figure VI. a ground plan
of the same; Figure VII. represents an elevation in section of the
furnace of a marine boiler, Figure VIII. a cross section, and Figure IX.
a ground plan of the same, and Figure X. an enlarged view of the bolts
or pins by which the rotary bars are joined together so as to form an
endless chain with a section of the longitudinal slides or grooves by

page_text: which the bars are supported and on which they slide in passing through
the fire-box.
In Figure I. X, X, X, X, represents the frame in which the rotary or
travelling bars, the drums, and gearing for moving the bars are mounted.
Y. Y, are the wheels which carry this frame on the rail Z. Z, Z. all these
parts being those usually employed in externally fired longitudinal boilers
and these parts not being applicable to any of the other descriptions of
boilers or appearing in any of the other Figures of the Drawings I have
thus described them by themselves. The other letters of reference are for
the most part common to all the other Figures of the Drawings.
A, A, A, represents the iron framing bolted to the front of the boiler,
and which carries the front drum D, the worm wheels, and other gearing
necessary for giving motion to the front drum. B is the fire-door which
boiler itself; the pipe
sliding telescope joint
C are the fire-
is formed hollow so as to contain water, which may be supplied to it
from a cistern in any convenient place or from the
to convey water to the hollow fire-door with its
is represented broken off at m, Figure IV., this fire-door is caused to
move up and down by means of the racks n and toothed quadrants o
keyed to the rocking shaft r,. to which motion is given by the lever p,
and thereby the thickness of the fire may be regulated.
bars which are formed into an endless chain, as represented on Figure IV..
these fire-bars are connected together by bolts e or joint pins, which
pass completely through the chain through the whole width of the
furnace bars; the ends of these bolts or joint pins are carried by and
slide along on the plain longitudinal slides or longitudinal grooves E
attached to the framing A (to the frame X, X, X, X, in Figure 1), and
to each side of the fire-box. These bolts and joint pins with a section
of the longitudinal slide or groove are represented in an enlarged plan at
Figure X. I sometimes use a third longitudinal slide in the centre of
the bars on which the under sides of the bars themselves slide, and
sometimes instead of rising the bolt ends and nuts as the means of
support for the bars I sometimes make use of two or more plain
longitudinal slides, along which the under sides of the bars themselves
slide. In the furnace of marine boilers I place two additional longi-
tudinal slides shown at E', E' (Figure VIII.), for the purpose of carrying
the bars on their way back to the front of the fire-box, as represented
by the arrows in Figures VII. This arrangement allows sufficient space
between the return bars and the ash-pit for raking out the ashes when
necessary. D is the front drum over which the rotary or travelling

page_text: bars G pass, and by which they are caused to traverse through the fire-
box. On the shaft of this drum D is keyed a worm wheel driven by
the worm, which receives motion from the driving pulley through
the means of the worm wheel and worn z. D' is the back drum
which in internally fired boilers, such as Cornish and marine boilers. (see
Figures IV. and VII.), runs loose on the wrought iron main stay or
shaft bolted or rivetted to each side of the fire-box, and in the externally
fired boilers. (see Figure 1.) runs in the framing X. X. X, X. In this
latter case I have found it economical to make this back drum D' with
the axle on which it revolves of cast iron all cast at one and the same
time but it may be made in any other convenient manner. F is the
fire-bridge which I make hollow, so that the water from the boiler may
pass completely through it, thereby preventing the fire from acting
injuriously upon the said fire-bridge 1. I also then make it a useful
generator of steam. In internally fired boilers this hollow fire-bridge
is so placed and connected with the boiler (see Figures V. and VIII.) that
it can be readily cleansed out when required. In externally fired boilers
it is to be connected with the boiler by the vertical tubes F', F
(Figures II., and III.) and at the back or other convenient part
of the hollow fire-bridge is placed A man-hole as represented by 1
(Figures 1., I., and III). G (Figure IV.) represents the opening which
I make in and through the bottom of the fire-box of Cornish and similar
internally fired tubular boilers for the purpose of passing the rotary
travelling bars down through and into a space H below the said boilers
and back, re-enter the opening in the front of the fire-box. which
space H now becomes the ash-pit for this description of boiler. I
represents fire-brick with which the crown and the back part of the
fire-box is lined.
Having described the nature of my said Invention, and in what
manner the same is or may be performed, I wish it to be understood
that I do not claim any of the articles or things herein described apart
from the combination or application thereof herein set forth; but what
I do claim I desire to be secured to me by the herein-before in part
recited Letters Patent is,-
First. The mode of constructing rotary or travelling furnace bars so
that the same are sustained and carried on one side by the ends of the
bolts or joint pins, and on the other side by the nuts on the other ends
thereof by which the said bars are joined together into the form of an

page_text: endless chain, the said bolt ends or joint pins sliding on plain longi-
tudinal slides or in longitudinal grooves on the said bars supported on
and sliding along plain longitudinal slides, as herein-before described and
illustrated in the Drawings.
Secondly. The mode of applying rotary or travelling bars to the
furnaces of internally fired tubular boilers, by forming an opening in
the bottom of the said furnaces and down through the bottom of the
boiler, through which opening the said bars are carried into and through
a space below the said boilers and back to re-enter the fire-box. as
herein-before described and illustrated in
illustrated in Figures IV., V., and VI. of
the Drawings.
Thirdly. The mode of constructing the furnace doors of steam boilers
hollow so that they may contain water, as herein-before described and
illustrated in the Drawings.
Fourthly. The mode of constructing the fire-bridge of steam boilers
below so that they may contain water, as herein-before described and
illustrated in the Drawings.
In witness whereof, I, the said James Taylor, have hereunto set
my hand and seal, this Sixth day of May, in the year of our
Lord One thousand eight hundred and sixty-nine.
JAMES TAYLOR, JR. (L.S.)