IMPROVEMENTS IN STEAM BOILERS
Year: 1885

page_text: I WILLIAM MALAM of Edgemoor in the County of Newcastle State of Delaware;
United States of America, Boiler maker, do hereby declare the nature of my inven
tion for "IMPROVEMENTS IN STEAM BOILERS" 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 boilers of the locomotive type, the objects of my inven-
tion being to increase the heating surface of the boiler to dispense with the usual
crown bars for the fire box and to so construct the smoke box casing as to render
any elaborate staying of the same unnecessary.
In the accompanying drawings
Figure 1 is a longitudinal section of a steam boiler made in accordance with my
invention.
Figure 2 a transverse section on the line 1-2 and
Figure 3 a transverse section on the line 3-4.
A is the outer shell or casing of the boiler, B, B¹ the opposite ends, and D D¹ the
opposite sides of the fire box casting, and F the smoke box casing, the usual tubes G,
running through the barrel of the boiler from the front plate B¹ of the fire box
casing to the front tube sheet H.
The sides and ends of the fire box casing should be stayed as usual but instead
of providing the fire box with the usual flat top or crown and the transverse
bracing bars therefor, I arrange in the part of the fire box water legs J, J; extend-
ing transversely across the fire box and riveted to the opposite side plates of the
same.
These transverse water legs form part of the crown of the fire box the crown
being completed by narrow transverse plates K, riveted to the side and end plates
of the fire box casing and to the shells of the transverse water legs J, and in order
to impart the necessary rigidity to these crown plates, they are made of the arched
form shown in Figures 1 and 2 or are corrugated as shown on one of them by
dotted lines in figure 1.
Through the transverse water legs J, extend short tubes a which serve to stay the
opposite sides of the shells of said water legs, and add materially to the heating
surface of the boiler.
I also utilize the smoke stack M and smoke box F as heating surface by
contracting the height of the smoke box casing F, and extending the barrel of
the boiler forward so as to enclose the said smoke box and the lower portion
of the stack:

page_text: The shell or casing A of the boiler has near the front end, a vertical drum N
enclosing the upper portion of the stack M and forming a steam dome which may
form the steam dome of the boiler, as shown or may be connected to the usual
steam dome on the top of the boiler.
In order to avoid the necessity of using an elaborate system of stays for the
smoke box casing F, I corrugate the same as shown in Figure 3 so as to impart to
it a degree of stiffness sufficient to enable it to resist the external pressure to which
it is subjected the front sheet of the shell A of the boiler being preferably expanded
as shown to accommodate this corrugated smoke box casing.
The utilization of the drum N as the steam dome of the boiler is an advantage
as the supply of steam for the engine is thus drawn from the boiler at a point as
remote as possible from the fire box casing, where the water is constantly in a state
of violent agitation owing to the large area and intensly heated condition of said
fire box casing.
"
It will be observed that the water leg J nearest the front end of the fire box is
deeper than the rear leg; so that the latter does not obstruct the free passage of the
products of combustion to and through the tubes of said front leg.
I do not claim broadly a boiler having tubed transverse water legs as many
different forms of such boilers have been devised.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
-
First The combination of the casing and tube cylindrical barrel of a boiler of the
locomotive type, with a fire box casing having tubed transverse water legs in the
upper portion of the combustion chamber as herein before set forth and illustrated
by the accompanying drawings.
Second-The combination of the casting and tube cylindrical barrel of a boiler
of the locomotive type with the fire box casing having tubed transverse water
legs J and crown plates K as hereinbefore set forth and illustrated by the accom-
panying Drawings.
Third: The combination of the casing and tubed barrel of a boiler of the
locomotive type with a fire box casing having tubed transverse water legs in the
upper portion of the combustion chamber, the forward leg being deeper than
the rear leg as hereinbefore set forth and illustrated by the accompanying
drawings.,
Fourth-The combination of the fire box casing having tubed transverse water
legs the tubes G the smoke box and stack and the boiler casing extended to enclose
the smoke box and lower portion of the stack and having a drum N enclosing the
upper part of the stack substantially as hereinbefore set forth and illustrated by
the accompanying Drawings.
Fifth The combination of the tube sheet the smoke stack and the smoke box
having a corrugated casing with the casing A of the boiler having an expanded
front sheet enclosing the smoke box substantially as hereinbefore set forth and
illustrated by the accompanying Drawings.
Dated this 94th day of August 100%