Improvements in the Manufacture of Marine and other Steam Boilers.
Year: 1892

page_text: Date of Application, 28th Oct., 1892
Complete Specification Left, 3rd July, 1893-Accepted, 5th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Marine and other
Steam Boilers.
We, HENRY PERSHOUSE PARKES, of Tipton Green Chain and Anchor Works,
Tipton, in the County of Stafford, Chain and Anchor Manufacturer, and JOHN
MCALPINE, of New Road, Blackwall, London, Manager of Engine Works do
hereby declare the nature of this invention to be as follows:-
Our invention has reference to the invention described and claimed in the
Specification of Letters Patent granted to us on the 2nd day of September 1891
No. 14844.
The patented invention referred to consists in manufacturing steam boilers
having practically solid shells or bodies by bending a flat plate of steel or wrought
iron or other hard and durable metal or alloy into an open jointed tubular shell:
afterwards welding the edges of the joint and finally closing the open ended shell
by welding discs therein.
Our present invention consists in giving additional rigidity and strength to the
tubular shell or body of the steam boiler and to its closing end discs in the
following manner. Instead of taking a flat plate from which the tubular shell is
to be made we take a corrugated plate of the required thickness. When this
plate is bent into an open jointed or tubular shell it has the figure of a hollow
cylinder having corrugations in a plane at right angles to its axis. We prefer to
corrugate the plate with one or more flat or half circle corrugations but we do not
limit ourselves to the number, size or shape of the corrugations as they may be
varied according to the size and shape of the shell to be made. The corrugated
plate is bent into an open jointed tube or shell by bending rolls.
Instead of corrugating the plate before it is bent into an open jointed tube or
tubular shell the plate may be corrugated by means of the bending rolls by which
it is bent into the open jointed tubular shell.
We also corrugate preferably with concentric corrugations the closing discs or
ends of the tubular shells to increase their rigidity and strength.
The joint of the corrugated shell may be heated to a welding heat by any of the
appliances described in the Specification of the Patent herein before referred to or
by other heating apparatus or appliances and the joint afterwards welded by the
welding rolls or machinery also described in the said Specification.
We vary the thickness of the corrugated plate according to the size of and
strength required in the shell to be made.
Dated the woth das of October 1800
W. T. WHITEMAN,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Marine and other
Steam Boilers.
We HENRY PERSHOUSE PARKES, of Tipton Green Chain and Anchor Works
Tipton in the County of Stafford, Chain and Anchor Manufacturer and JOHN
MCALPINE, of New Road, Blackwall, London Manager of Engine Works do
hereby declare the nature of the said invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement :-
Our invention has reference to the invention described and claimed in the

page_text: Specification of Letters Patent granted to us on the 2nd day of September 1891 ;
No. 14844.
י
The patented invention referred to consists in manufacturing steam boilers
having practically solid shells or bodies by bending a flat plate of steel or wrought
iron or other hard and durable metal or alloy into an open jointed tubular shell;
afterwards welding the edges of the joint and finally closing the open ended shell
by welding discs therein.
Our present invention consists in giving additional rigidity and strength and
increased longitudinal elasticity for expansion and contraction to the tubular shell
or body of the steam boiler and to its closing end discs in the following manner.
Instead of taking a flat plate from which the tubular shell is to be made we take a
corrugated plate of the required thickness. When this plate is bent into an open
jointed or tubular shell it has the figure of a hollow cylinder having corrugations
in a plane at right angles to its axis. We prefer to corrugate the plate with one or
more flat or half circle corrugations but we do not limit ourselves to the number
size or shape of the corrugations as they may be varied according to the size and
shape of the shell to be made. The corrugated plate is bent into an open jointed
tube or shell by bending rolls.
Instead of corrugating the plate before it is bent into an open jointed tube or
tubular shell the plate may be corrugated by means of the bending rolls by which
it is bent into the open jointed tubular shell.
We also corrugate in a like manner the closing discs or ends of the tubular shell
to increase their rigidity and strength and give them increased longitudinal
elasticity for expansion and contraction.
The joint. of the corrugated shell may be heated to a welding heat by any of
the appliances described in the Specification of the Patent herein before referred to
or by other heating apparatus or appliances and the joint afterwards welded by
the welding rolls or machinery also described in the said Specification.
We vary the thickness of the corrugated plate according to the size of and
strength required in the shell to be made.
Figure 1 of the accompanying drawing represents partly in side elevation and
partly in longitudinal section a marine (or other) steam boiler the tubular shell of
which is corrugated according to this invention and Figure 2 represents in section
a portion of the same drawn to a larger scale. The tubular shell or body of the
boiler is marked a and is made by bending a plate of steel or wrought iron or other
hard and durable metal or alloy into an open jointed tube and welding the edges of
the joint and finally closing the open ended shell or body a by welding the end
discs b, b therein. The said tubular shell or body a of the boiler is provided with
flat or angular corrugations c, c arranged (preferably) in a plane at right angles to
the axis of the said shell or body.
The said flat or angular. corrugations are arranged preferably at the distance
apart and are made of the size and depth represented, but they may be otherwise
arranged and be made of other shapes; for example the corrugations may be semi-
circular in figure as represented in the section Figure 3, the semi-circular corruga-
tions being marked d, d.
The shell or body a of the boiler may be made from a corrugated plate, or the
open jointed tube or tubular shell, made from a plain plate, may be corrugated by
the bending rolls by which the plate is bent into the open jointed tubular shell.
In either case the corrugations do not extend to the edges of the plate or open
jointed tubular shell the welding edges being left plain or uncorrugated. After the
welding operation, the plain parts at and near the joiut may be corrugated by
means of rolls, or by a steam hammer or hydraulic press.
The corrugated shell of the boiler may be closed either by plain closing discs or
ends b, as represented in Figure 1; or by corrugated closing discs or ends as
represented in end elevation in Figure 4 and longitudinal section, with a portion
broken away, in Figure 5 where the flat corrugations are marked e, e aud extend
across the closing ends b, b as best seen in Figure 4. In the boiler Figures 4 and 5

page_text: the fire tubes are marked f; the furnace flues are marked 9 and the combustion
chamber h.
By corrugating the boiler shell or body and its closing discs or ends as described
and illustrated, the said shell or body and discs or ends are strengthened and
increased rigidity in the boiler obtained. The said shell or body and closing discs
or ends have also increased longitudinal elasticity given to them for expansion and
contraction.
Having now particularly described and ascertained the nature of our inven-
tion and the manner in which the same is to be performed we declare that we
claim as our invention of " Improvements in the manufacture of marine and other
steam boilers" ;-
Giving additional rigidity and strength and increased longitudinal elasticity to
steam boilers having practically solid shells or bodies of the kind referred to,
by corrugating the said shells or bodies and their closing discs or ends substantially
as herein before described and illustrated in the accompanying drawing.
Deted the Twenty-eighth dex of June 1893
HENRY PERSHOUSE PARKES.
JOHN MCALPINE.