IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1884

page_text: COMPLETE SPECIFICATION.
I WILLIAM MALAM of the Village of Edgemoor, in the County of Newcastle
State of Delaware, United States of America, Boiler Maker do hereby declare the
nature of said invention for IMPROVEMENTS IN THE CONSTRUCTION OF STEAM
BOILERS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The object of my Invention is to construct a strong steam boiler having extended
heating surface and free circulation of water so as to provide for the rapid
generation of steam.
In the accompanying drawing,-
Figure 1 is a longitudinal section of the boiler.
Figure 2 a sectional plan on the line 1-2, Figure 1.
Figure 3 a transverse section on the line 3-4, Figure 1.
Figure 4 a transverse section on the line 5-6, Figure 1.
Figure 5 a perspective view of a plate for connecting the casings of the fire box
Blue and tube flue of the boiler with the combustion chamber casing.
Figure 6 a perspective view of one of the fire box flue sections.
Figure 7 a perspective view of one of the bracing rings of the fire box flue and
Figure 8 a view shewing a modification.
A is the outer cylindrical shell of the boiler and B and D the front and rear
ends of the same, the front having in it upper and lower elongated openings a and b.
Around the edge of the upper opening a is riveted the flanged front end d of a fluo
casing F, across which extend a number of rows of vertical tubos G and around
the edge of the lower opening b is riveted the flanged front end of a fire box flue
casing H which is composed of a number of flanged sections I and between the
Hanged heads g of these sections are interposed bracing rings J which serve to
stiffen the flue casing and prevent collapse of the same by pressure upon its fint
surfaces. These surfaces may be corrugated if desired, as shewn by dotted lines in
Figure 3 in order to enable them to better resist the pressure to which they are
subjected.
The fire box flue casing is further braced by tubes K, slightly inclined rearward
from bottom to top, the front of the flue having a single central row of tubes
extending longitudinally between the fire grates P, but the flue in the rear of the
bridge wall h having two transverse rows of tubes.

page_text: These tubes in addition to stiffening the flue casing, serve to provide for the free
circulation of the water and steam from the bottom to the centre of the boiler,
whence it passes through the tubes G to the top.
The rear ends of the flue casings F and H are fitted within and secured to the
flanges m and n surrounding elongated openings M and N in a plate Q, the outer
edge of which has a rearwardly projecting flange p secured to the front end of the
casing R of a combustion chamber S, the rear end of said casing being secured to
a plate T connected by stay bolts to the rear end D of the boiler casing.
The combustion chamber casing R is corrugated as shewn in Figure 4, so as to
increase the heating surface and permit ready expansion and contraction.
As the entire surface of the fire box flue, tube flue, combustion chamber and
both sets of tubes G and K is availablo as heating surface and a direct course is
presented by said tubes G and K for the circulation of water the rapid generation
of steam is insured.
The making of the fire box flue in sections facilitates the economical repair of
said casing and provides for the convenient introduction of bracing rings J.
It should be understood that the boiler is to be furnished in front with the usual
casing enclosing a smoke box communicating with the tube Hue and chimney, but
as this forms no part of my Invention has not been illustrated in the drawing.
Instead of using elongated fire box flues with crossing tubes as shewn and
described I may in some boilers substitute therefor two or more circular fire boxes
such as are now employed and shewn in Figure 8, each of these boxes having the
usual grate and the rear ends of the boxes being secured to flanges surrounding
circular openings in the plate Q.
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 in a steam boiler of the outer shell, the upper and lower
flue casings, and the connecting combustion chamber having corrugated casing,
substantially as hereinbefore described and illustrated by the accompanying
drawing.
Second. The combination in a steam boiler, of the outer shell, the lower flue or
flues having furnaces, the upper flue having crossing tubes, and the connecting
combustion chamber having a corrugated casing, substantially as herein before
described and illustrated by the accompanying drawings.
Dated 10th December 1884.
J. HENRY JOHNSON,
Agent for the said William Malam.