Improvements in Boiler Bridges.
Year: 1891

page_text: Date of Application, 21st Mar., 1891
Complete Specification Left. 21st Dec.. 1891-Accepted, 23rd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Boiler Bridges.
I, JAMES ARTHUR DENTON of 19 Mumforth Street Flint, North Wales, Foreman
of Works, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to construct boiler bridges in such a manner that
they can be used either with or without bricks, and the latter when used are held
in position without the use of mortar or cement, thus preventing danger from the
boiler plates rusting by contact with the same.
With this object I form a casting of the required dimensions to fit the interior of
the fire box leaving sufficient space for the plaster, or other airtight packing between
that and the boiler plates. The crosspiece at the back of the firebars, constituting
the bridge is formed in a manner so as to support the bricks or other fire resisting
substances, these are drawn tightly together and held in position by means of metal
straps and bolts. The firebars and other parts of the furnace, may be of. any
ordinary description. The bridge castings may be supported either partially
or entirely by means of bolts to the boiler plates and firebars. My improvement is
applicable to all horizontal boilers.
Dated this 21st der of March 1891
GRAHAM & GRAHAM,
Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in Boiler Bridges.
I, JAMES ARTHUR DENTON of 19, Mumforth Street Flint N. Wales Foreman
of Works 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 boiler bridges for marine and other boilers, its objects
being to construct a strong and efficient bridge in such a manner, that the fire
bricks are held firmly in position without the use of cement, or if preferred the
same may be dispensed with altogether.
For this purpose I construct a cast iron plate preferably in two sections or
castings, one overlaping the other any required distance, and of such a form that
when bolted together in the manner hereinafter described they present a level
surface. On the front of this plate any required number of ribs or projections are
cast to prevent the plate from coming into close contact with the fire bars when
fixed in position.
The plate is preferably attached to the fire bars, and their supports by means of
hooks and bolts of a form hereinafter specified and may be constructed of any
required dimensions to fit the interior of the furnace, leaving just sufficient space
for the air tight packing round the sides and lower part and also for the passage of
the smoke over the upper edge.
In front of this plate when fixed in position the fire bricks are placed, if used,
cach block having a hole in any suitable position, through which a rod, strap or bar
of metal is passed, the whole series being thus firmly bolted together without the
aid of cement, or other like substance and preventing the rusting of the boiler
plate.
In the accompanying drawings I have shown how my invention may be con-
veniently and advantageously carried into practice.
Fig. 1. is a front elevation of my boiler bridge plate showing the two sections or
castings divided ;

page_text: Fig. 2. a cross section or edge view of the same, with the overlapping parts in
position and bolted together.
Fig. 3. shows a portion of a boiler furnace in longitudinal section with my
improved boiler bridge fitted therein;
Fig. 4 shows one of the bolts and hooks by which the said castings are held in
position, drawn to an enlarged scale;
Like letters of reference indicate corresponding parts in all the figures.
a a are the two castings or sections forming the plate which may be of any
suitable dimensions. On the surface of these castings or sections any suitable
number of ribs or projections b, b, bare formed (preferably by casting them thereon)
to prevent the plate coming into direct contact with the fire bars. The part c. of
the casting a overlaps the casting a and the two are bolted together as shown in
Fig. 2.
On the sides of the bolt holes d, d' d on the section or casting a raised flanges or
projections e, e, e, c, are formed for the purpose of preventing the square headed bolts
from turning in the holes when being screwed up tightly.
In lieu of holes for the said bolts on the casting a' I form a corresponding
number of slots f, f1, 2, thus providing for a certain amount of adjustment in the
plate, should such be required, to the more accurately fit the furnace.
I prefer to affix the plate to the fire bars g and their supports by means of any
suitable number of wrought or cast iron hooks i, i. one of which is shown on an
enlarged scale in Fig. 4.
The screw threaded ends of the hooks i, i. are inserted in the holes j,j, j, j. (Fig. 1)
and drawn up tightly by means of the hexagon nuts k. k. thus fixing the plate
firmly in place, the hooked portions ¹, i, engaging with the upper part of the fire
bars g and the lower part of the fire bars support h. as seen in Fig. 3. The fire
bars g. and their support h are shown rivetted to the shell of the furnace l at m, m, m
but they may be affixed by any of the usual methods.
n is the fire brick portion of the furnace a bridge formed of any number of bricks
or blocks, secured firmly in position by means of a strap or rod of metal o. which
passes through all the blocks in succession, thus obviating the use of cement or
other like material.
The space p between the plate and the furnace shell / may be filled in with any
suitable material or packing without cement, as no further support is required, in
addition to the before mentioned hooks, to keep the plate in its proper position.
By the use of this my invention, the rusting of the boiler plates is prevented, a
very strong, efficient and inexpensive boiler bridge is obtained which can readily be
removed when required and also, fire bricks when used are firmly secured without
the aid of cement or other like substance.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :-
1st. In boiler bridges the method of securing the fire bricks in position by means
of one or more rods or bars passed through the said bricks and without the aid of
cement or other like material as herein set forth.
2nd. In boiler bridges and furnaces, the casting or castings forming a plate as
herein above described, having ribs or projections on the surface and being affixed
by the means herein described, to the fire bars and their supports immediately
behind the fire bricks where such are used as substantially set forth and described
in the above Specification and illustrated in the drawings hereunto annexed.
Dated this 21st day of December 1801
GRAHAM & GRAHAM,
Agents for Applicant.