Improvements relating to Steam-boiler and other Furnaces.
Year: 1887

page_text: --
Date of Application, 5th Apr., 1887. -
Specification Accepted, 6th May, 1887.
[Communicated from abroad by ROBERT LONDON WAlker, of Boston, Massachusetts,
United States of America, Mechanical Engineer.]
Improvements relating to Steam-boiler and other Furnaces.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings, in the County of Middlesex, 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:-
This invention relates to improvements in the furnace lining described in the
Specification United States Patent No. 75,817 of 1868; and its main object is to
prevent the practical troubles arising from unequal expansion and contraction of the
water linings.
In furnace linings described in the said specification the water spaces were formed
by cores, the linings being castings cored out to form such water spaces; hence the
walls of the water spaces varied in thickness in spite of the utmost care to set and hold
the cores true, and the practical result being that the linings would crack when in use
in the furnace.
In the accompanying drawings
Figure 1 is a perspective, explanatory of a furnace with my improved water linings,
and also illustrating the water connections.
Figure 2 is a partial front elevation.
Figures 3 and 4 are plan views of the plates used with the said linings.
Figure 5 is a partial side elevation of one of the side linings.
Figure 6 is a section on line 6, 6 of Figure 5.
Figure 7 is a section showing one end of the wrought iron pipe used for the side
linings.
Figure 8 is a plan or a part of the grate or bottom lining.
Figure 9 is an edge view of Figure 8.
Figures 10 and 11 are sectional views, showing the shape of the wrought iron pipes
in the grate.
A A represent the side linings, B the bottom lining or grate of the furnace and
D the boiler.
The pipe d leads from the water space, or bottom of the boiler, and from this pipe d
smaller pipes extend to the lower drums of the side linings and to the sections of
the grate, as will be clear to all skilled in the art without detailed description.
Each lining is composed of a number of wrought iron pipes cach of which is
expanded at its ends, and has each of its ends coated with tin, nickel, copper, or the

page_text: like, applied by the usual tinning process or by a battery. In practice I prefer the
tinning process, because it is cheaper; but I find electro-plating to answer well.
By means of this compound pipe I not only do away with the cracking of the water
linings, but also am enabled to make the main walls of the water spaces very much
thinner than was possible in my old style of furnace, and also get more air space in
the grate or bottom lining.
The heads of the side lining pipes are bored and tapped to receive the
pipes, by which and the unions and pipes 5, 6 each compound pipe in the side
lining is connected to the drums fand f¹.
The main feature of my invention consists in that construction of the water-lining
for a furnace, namely a series of pipes connecting two drums f, and f1 by means of
connecting pipes and unions. In this construction of water lining any imperfect pipe
can be removed and replaced without disturbing the others and when the pipes 63 76
are at an angle with the main pipes, full provision is afforded for the expansion and
contraction of the main pipes. This compound pipe when used for a bottom lining or
grate bar is best flattened as shown in Figure 11, whereby three important functions are
performed, that is the main pipe is better adapted to support the weight of the fuel, a
better air space is afforded between the pipes and a free discharge of ashes is
provided.
For use as grate bars, I prefer to cast two or more pipes into one head, as
illustrated in that form of a section of grate bars shown in Figure 8, for the reason
that in casting a section for the grates or bottom linings, it is more convenient to
unite a number of pipes at one casting, as illustrated in Figure 8 than to make each
compound pipe independent as shown in the side lining.
In Figure 8 the central group shows three pipes joined at one end by a single
casting. The middle pipe of this group has its head cast upon it. This section also
shows pipes in pairs with one head cast upon a pair at one end, while a head at the
other end joins one member of one pair to one member of another pair.
Founders will understand without description the moulding and casting of the
compound pipe whether with independent heads as in side linings or with heads
uniting two or more pipes as in the grate section.
In Figures 2, 3 and 4 I show plates g, g¹ of cast iron the plates y extend between
the boiler and the side wall of the furnace, and in practice the top of the boiler and
the pipes above the plates are covered by some non-conducting substance, as will be
understood without description. The plates g' bridge over the space between the
grate and the side wall of the furnace; (see Figure 2).
The blow-off cocks from the drums are used to clear the boiler of sediment
which collects in the drums f.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed as communicated to me by my
foreign correspondent I declare that what I claim is.
First-In combination a series of pipes a, heads'b, bª, couplings b², 6³, ¿ª, 1º and 6º,
and drums ff substantially as described.
Second-In a steam boiler furnace, the two side linings and the bottom lining or
grate, each composed of a series of wrought pipes with cast heads, substantially as
shown in combination with the plates g, gall substantially as described.
Dated this 5th day of April 1887.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.