Improvements in Vertical Boilers.
Year: 1889

page_text: Date of Application, 2nd Mar., 1889
Complete Specification Left, 2nd Dec., 1889-Accepted, 11th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in Vertical Boilers.
HURAM COLTMAN, JOHN CHARLES COLTMAN & ERNEST EDWIN COLTMAN all of
the Firm of Messrs. H. Coltman & Sons Engineers & Boiler Makers Midland Iron
Works, Loughborough, in the County of Leicestershire do hereby declare the nature
of this invention to be as follows:-
Our Invention has for its object more especially the production of a Vertical Boiler
of a superior commercial form in the which an increased heating surface may be
obtained by reason of the combined economic benefits derived from the horizontal
multitubular & the return tube systems for a given size, yet requiring no projecting
smoke-box nor chimney radiating beyond the normal diameter of the boiler itself thus
economising space & bulk.
In carrying out this our invention we provide the usual firebox & shell common to
vertical boilers & likewise the chimney communicating through the crowns of the
firebox & the shell respectively. Now the volumn of gaseous products of combustion
together with its heat is not permitted to pass immediately up the chimney but is
diverted & made to pass backwards & forwards once or more through the horizontal
tubes communicating between that part of the Chambers which cannot strictly be
called the firebox (but which however springs immediately out of & above it yet to
the one side of the centre line & which we will call the combustion chamber) & the
smoke box or chamber which is situated immediately opposite to it. This is
accomplished by means of one or more partitions situated within one or both of these
chambers as the case may require.
It is optional whether the gases are made to discharge into the chimney at the
combustion chamber side, or at the smoke box-side of the boiler, for that depends
merely upon the number of times it is provided to divert them to & fro through
the tubes.
The two chambers before mentioned are both situated in plan within the normal
periphery of the boiler, but at opposite sides of the same with their tube plates facing,
each other the former surrounded by water but the latter having a smoke-box door on
the outer side closing preferable onto the barrel.
The partition before mentioned may be movable preferably after the manner of a
throttle valve in order that any soot lodging thereon may be easily removed.
Dated this First day of March 1889
Signed HURAM COLTMAM.
J. CHARLES COLTMAN.
ERNEST E. COLTMAN.
COMPLETE SPECIFICATION.
Improvements in Vertical Boilers.
We, HURAM COLTMAN, JOHN CHARLES COLTMAN & ERNEST EDWIN COLTMAN all
of the Firm of H. Coltman & Sons Engineers & Boiler Makers Midland Iron Works
Loughborough Leicestershire 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 :-
It has for its object more especially the production of a Vertical Boiler of a
superior commercial form having a symetrical & regular outline & a large heating
surface with a minimum of bulk. It combines within a vertical boiler the horizontal
multitubular & the return tube systems & it necessitates no projecting chambers beyond
the boundary of the shell.

page_text: We will proceed to describe it by the aid of the several figures of the accompanying
drawing in the which & as nearly as possible like letters correspond to like parts.
Figure 1 represents a sectional elevation & Figure 2 a sectional plan of the same in
the most approved form the upper half of which latter represents a section on line A B,
the lower half a section on line CD whilst Figure 3 is a primative or parent idea
from which it has sprung.
In-carrying out this our invention we provide the usual shell F chinney throat G
& firebox E common to vertical boilers the crown of which firebox may be inverted if.
desired as shown. The heated gases are not permitted to pass immediately into the
chimney but are made to traverse forwards & backwards once or more through the
forward & the backwards tubes J, & J, respectively en route thereto. Referring
to Figure 3 it will be seen that this is accomplished by simply providing a partition
plate or door, or valve M situated within the chamber K & about half way up the tube
plate T so that the gases pass through the the forward tubes J, into the opposite
chamber L& return through the backward tubes J, into the former chamber but above
the partition plate M.
2
We prefer however the modification of this arrangement as provided in Figures
1 & 2 where it will be seen that the chamber K as described is stopped short & is
surmounted by a separate chamber P. Chambers L & P are accessible for cleaning
purposes by doors or lids Q₂ & Q₁ respectively whilst chamber K is surrounded
by water.
1
We do not bind ourselves to use the forward & the backward tubes only, for they
may in turn be surmounted by another set of one or both so long as the necessary
chamber or chambers is or are added & that the uptake V is connected with the
last from whichever side of the boiler it may happen to terminate. Neither do we bind
ourselves to use the pipe R connected to the firebox crown. Nor yet do we bind
ourselves to contain the said chambers within the periphery of the shell itself since
projecting chambers may be provided beyond if desired & so also may the chimney
throat but these departures are not advised.
Having now particularly described & ascertained the nature of our said inven-
tion & in what manner the same is performed we declare that what we claim is :-
:―
(1) In vertical steam boilers the mode of providing horizontal multitubular heating
surface by means of forward & backward tubes J, & J₂ respectively situated between
opposite chambers & communicating with the firebox from below & the chimney throat
above & having the tube plates & chambers contained within the periphery of the
cylindrical boiler shell itself substantially as & for the purposes herein before described
& illustrated in the accompanying drawing.
(2) The arrangement & combination of parts substantially as & for the purposes
herein before described & illustrated in Figures 1 & 2 of the accompanying drawing.
(3) The like preceeding claiming clause as applied to Figures 3 & the lower half
of Figure 2 of the accompanying drawing.
(4) The like preceeding claiming clause as applied to the several modifications as
substantially described.
(5) The like claim as provided in claiming clause No. 1 with the exception that
the necessary chambers or chimney throat or both may be situated beyond the natural
boundary or periphery of the cylindrical boiler itself substantially as & for the
purposes herein before described.
Dated this Thirtieth day of November 1889
Signed HURAM COLTMAN.
JOHN CHARLES COLTMAN.
ERNEST EDWIN COLTMAN.