Improvements in Boiler Furnaces for or in connection with Return Flue Boilers.
Year: 1891

page_text: Date of Application, 15th Sept., 1891-Accepted, 17th Oct., 1891
COMPLETE SPECIFICATION.
Improvements in Boiler Furnaces for or in connection with Return
Flue Boilers.
A communication by James FREDERICK BLISS, of 189, West Brookline Street,
Boston, in the State of Massachusetts, one of the United States of America
Ship Chandler:
I Alfred GeorGE BROOKES of 55 & 56 Chancery Lane in the County of
Middlesex, Patent Agent 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 has for its object to improve the construction of boiler furnaces
for, or in connection with, return flue boilers.
In accordance with this invention, the boiler, having the usual return flues, is
supported on jacks, preferably in an adjustable manner.
A water jacket is placed beneath said boiler, being formed to contain within it a
fire-box, ash pit, and draft chamber.
The water jacket is connected with the boiler by numerous pipes to
obtain a
proper circulation.
I have employed a water grate, and a water leg back of it, and so far as the
essential features of my invention are concerned, said water leg may be located
directly beneath the boiler to leave a draft opening or passage below it, thereby
ensuring a down draft, or it may rest on the water jacket with an opening or passage
above it, ensuring an up draft.
This water jacket, containing a water grate, water leg back of it, ash pit, and
draft chamber, and the pipes connecting said water jacket with the boiler, constitute
the boiler furnace.
Fig. 1 shows in side elevation a boiler and furnace embodying this invention,
Fig. 2. a longitudinal section of the boiler furnace, shown in Fig. 1, and in
elevation the boiler.
Fig. 3, a front elevation of the boiler and furnace shown in Fig. 1.
a represents a return flue boiler of any usual or suitable construction.
Upon each side of it, ears or lugs a' are secured, which rest upon jacks, herein
shewn as composed of columns a², and screw-rods a³, being thereby adjustable.
Beneath said return flue boiler a, a water jacket is placed, it being shewn as
substantially rectangular in cross section from the front rearwardly for about
one-half its length and semi-circular in cross-section the remaining distance.
This water jacket is extended some distance beyond the rear end of the boiler a,
as best shewn in Fig. 2, where it communicates with a suitable shell c on the rear
of said boiler.
The water jacket b, at its forward end, contains the water grate d, and the water
leg e resting against the underside of the boiler a, thereby leaving an opening
beneath it to ensure a down draft.
The water lege is connected with the water jacket to allow free passage of the
water from side to side.
Back of said water lege the water jacket simply presents a draft-flue or chamber,
and the shell c also forms a draft-flue or chamber, which encloses the entrance to
the flues of the boiler a.
Numerous short pipes, as f, connect the water jacket with the boiler a at different
points to establish and maintain a good circulation.
The fire is built on the water-grate din usual manner, and the draft, passing
down through the grate beneath the water leg e, passes through the flue or chamber

page_text: .
back of it, thence through the flues in the boiler a, and into the up-take g at the
front of the boiler.
The water contained in the water jacket 6 becomes heated, and rising, passes
through the pipes finto the boiler until the water contained in the boiler is of
equal temperature.
By means of this water jacket, I am enabled to generate steam much quicker, to
make more steam, having a larger quantity of water, thereby materially increasing
the working capacity.
In practice I propose to remove the usual brick boiler furnace from beneath a
return flue boiler, and to substitute therefor the furnace herein shown and connect
it with the boiler in the manner shown and described.
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 I
claim is :
In boiler furnaces for, or in connection with, return flue boilers;
1: The return-flue boiler a, combined with the water jacket 6 placed beneath it
and shaped substantially as shewn and described, and containing the water grated,
and water lege, and the connecting pipes connecting the water jacket 6 with the
boiler a to establish and maintain a circulation of water, substantially as and for
the purpose set forth.
2 The return-flue boiler a; and adjustable jacks for supporting it, combined
with the water jacket 6 placed beneath it and shaped substantially as shewn and
described, and containing the water grate d, water leg e, and short connecting
pipes connecting the said water jacket and boiler, substantially as and for the
purpose set forth.
Dated the 12th day of September 1891.