Improvements in Boilers for Generating Steam.
Year: 1894

page_text: Date of Application, 27th Nov., 1894-Accepted, 26th Jan., 1895
COMPLETE SPECIFICATION.
Improvements in Boilers for Generating Steam.
I, JOSEPH JOHN BOHNER, of 195 Metropolitan Avenue, in the City of
Brooklyn, in the County of Kings and State of New York, United States of
America, Engineer, 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 locomotive and other boilers of the class in which a
water table connecting the water legs is arranged at the back of the firebox over
the grate and below the flue sheet to accelerate the heating and the circulation.
The object of my invention is to further improve this class of boilers by
facilitating the circulation from the water table and at the same time utilizing the
upper part of the firebox to accommodate additional water tubes, and to this end
my invention consists mainly in arranging in the upper portion of the firebox a
group of water tubes leading from the top of the water table upward and forward
into the water front above the furnace door.
And in order that my invention may be fully ascertained I shall first describe in
detail the mode in which I practise the same and then point out the invention in a
claim, reference being had to the accompanying drawing forming part of this
Specification in the various figures of which the same parts are designated by the
same letters.
Figure 1 is a longitudinal sectional view of part of an ordinary locomotive boiler
provided with my improvement.
Figure 2 is a detail sectional plan view on the line 22, Figure 1.
Figure 3 is a longitudinal sectional view illustrating a modified arrangement of
water table.
The boiler thus represented is part of an ordinary construction having the water
back A water front B water legs C and crown D tied by stay bolts E the hori-
zontal flues F leading forward from the flue sheet G and the transverse
longitudinally inclined water table H connecting the water legs C and extending
across the back of the firebox I immediately below the group of flues F to receive
the first onset of the fire and start the circulation laterally from the ends of the
water table H into the water legs and upward therein into the crown and
dome.
In Figure 1 the back of the water table H is shown separated from the water
back A the space left thereby being filled by removable fire bricks J to facilitate
the removal of waste accumulations from the top of the water table. Hand holes
and plugs M are also shown extending through the water legs C to give access to
the top.
of the water table for this purpose.
In Figure 3 the back of the water table H is shown communicating with the
water tank A,-a less desirable arrangement.
To improve the upward circulation from the water table H and at the same
time utilize the upper part of the firebox I for an additional heating surface, I
extend a group of water tubes K from the top of the water tube H upward and
then by arching them longitudinally forward on an incline under the crown sheet
into the water front B above the furnace door L through which tubes K the hot
water and steam will readily ascend from the water table into the water front B
and thence into the crown and dome which circulation will be further accelerated
by direct exposure of the tubes K to the heated gases rising from the fire and
directed by the water table H past its front.

page_text: The tubes K are preferably expanded in the top of the water table H and in the
tube sheet of the water front B by inserting the expanding tool through opposite
apertures and afterwards closing said apertures with plugs M.
To suitably strengthen the water table H and also to form passages there-
through for the ascending gases which will thereby tend to keep the top of the
water table clear of accumulations I tie the top and bottom of the water table
together by tubular tie bolts N arranged among the tubes K.
It will be seen that my conception is to improve the type of boiler exemplified
by the ordinary locomotive boiler in which the water table is necessarily placed
near the fire and terminates a distance from the front to give free space for firing
and cleaning flues.
By the construction described I leave the boiler unimpaired while I give the
free upward circulation through the water table not otherwise obtainable owing to
its termination in the fire space.
Further, by running the pipes upward from the top of the table as claimed I am
enabled to introduce a group of heating and circulating pipes of the total cross
sectional area of the said top of the table thus providing an extremely valuable
heating and circulating system without utilizing space required for firing or
cleaning flues or interfering with the direct draught through the flue sheet.
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 :-
The combination, with a boiler having a transverse water heating and circulating
water table opening into the water legs projecting forward from the water back
over the grate and terminating some distance from the water front, of a supple-
mentary group of water heating and circulating tubes connected with the top of
said water table rising therefrom to or near the crown sheet and extending thence
forward into connection with the upper part of the water front substantially as set
forth.
Dated this 26th day of November 1801
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicant.