IMPROVEMENTS IN STEAM-BOILERS
Year: 1881

page_text: LETTERS PATENT to Henry Wollaston Blake, of the City of London, Engineer,
and James Shepherd, of the City of Manchester, Engineer, for an Invention
of "IMPROVEMENTS IN STEAM-BOILERS."
PROVISIONAL SPECIFICATION left by the said Henry Wollaston Blake
and James Shepherd at the Office of the Commissioners of Patents on the
2nd August 1881.
HENRY WOLLASTON BLAKE, of the City of London, Engineer, and JAMES
SHEPHERD, of the City of Manchester, Engineer. "IMPROVEMENTS IN STEAM
BOILERS."
The objects of our Invention are to increase the area of heating surface in the
flue tubes of steam boilers, and to render the parts exposed to the action of the
water less liable to choke with deposit than is the case with various forms of pipes
or vessels when enclosed in the flue, and also to render the construction of such
flue tubes strong and flexible, or admitting of expansion and contraction.
To carry our improvements into effect, we form U shaped chamber rings bent.
or formed in the direction of the flue's circumference, and fix the same at suitable
distances in the flue and between the parts thereof throughout, or for such portion
of its length as is deemed desirable, in such manner that the chamber rings
aforesaid shall form portions of the flue tube. These chamber rings may be
constructed of wrought iron or of suitable steel, and of any reasonable thickness
and dimensions. For general purposes we employ the method now adopted in the
construction of flue tubes, whereby the steel or iron plates are bent and rivetted or
welded into cylindrical form, and are then flanged at each end for the purpose of
rivetting together into one flue. When the cylinders are thus prepared, we rivet
between the flanges of each or any desired number thereof one of the chamber
rings before mentioned. For caulking purposes a thin disc or ring of flat iron is
placed between each side of the chamber ring and the flange of the adjoining flue
plate, and the whole are substantially joined together. Chamber rings of this
description may be used with plates of plain or corrugated surfaces, and whether
the plates forming the cylinders are flanged or not.
In which latter case the plates forming the chamber rings may be flanged over .
for rivetting purposes, but we prefer the flanging the plates forming the cylinders,
as by that means the circumferential seam of rivets is removed from the direct
action of the fire and gases.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henry Wollaston Blake and James Shepherd in the Great Seal
Patent Office on the 2nd February 1882.
HENRY WOLLASTON BLAKE, of the City of London, Engineer, and JAMES
SHEPHERD, of the City of Manchester, Engineer. "IMPROVEMENTS IN STEAM
BOILERS."
The objects of. our Invention are to increase the area of heating surface in the
fluc tubes of steam boilers, and to render the parts exposed to the action of the
water less liable to choke with deposit than is the case with various forms of
pipes or vessels when enclosed in the flue, and also to render the construction of
such flue tubes strong and flexible or expansive.
To carry our improvements into effect, we form U shaped chamber rings bent or
formed in the direction of the fluc's circumference, and fix the same at suitable
distances in the flue and between the parts thereof throughout, or for such portion
of its length as is deemed desirable, in such manner that the chamber rings
aforesaid shall form portions of the flue tube.
The chamber rings may be constructed of wrought iron or of suitable steel, and
of any reasonable thickness and dimensions. For general purposes we employ the
method now adopted in the construction of flue tubes, whereby the steel or iron
plates are bent and rivetted or welded into cylindrical rings, and are then flanged
at each end for the purpose of rivetting together into one flue. When the
cylinders are thus prepared, we rivet between the [flanges of each or any desired
number thereof, one of the chamber rings before mentioned. For caulking
purposes a thin disc or ring of flat iron is placed between each side of the chamber
ring and the flange of the adjoining flue plate, and the whole are substantially
joined together.
Chamber rings of this description may be used in conjunction with plates of
corrugated or fluted surfaces, and with straight lengths of plates where the rivetted
seams are plain lap jointed. When the plates forming the flue are not flanged at
the ends, then the chamber rings may be flanged outwardly for rivetting in the
-ordinary-manner, but we prefer to flange each end of the plates forming cylinders
or flues and retaining the strict U shape of the chamber ring, as by that means the
circumferential seam of rivets is removed from the direct action of the fire and
gases.
But that the Invention may be better understood, we will by the aid of the
accompanying Drawings proceed more fully to describe means employed by us.
DESCRIPTION OF DRAWINGS.
Fig. 1 shows a longitudinal section of a flue-tube for ordinary stationary boiler,
having flanged seams, and constructed with the chamber rings as described;
Fig. 2 shows a longitudinal section of marine type of flue, constructed with chamber
rings; Fig. 3 shows the application of the chamber rings to straight edged plates;
and Fig. 4 shows the application to corrugated plates. The same letters indicate
corresponding parts wherever they occur. a, a, is the flue tube; and a¹, a¹, are
the chamber rings which form channels or chambers around the flue, and thus
provide spaces for currents of water to be brought under the heating action of the
gases in the flue tube, thereby increasing the heating surface of the boiler. The
marine type of flue tube may be composed as shown of chamber rings joined
together with a caulking ring between each. Although the chamber rings in each
-example are shown fitted with caulking rings of metal, the same may be dispensed
with, and plates with thickened edges for caulking purposes used instead of the
flat rings

page_text: Having now described our improvements, and means we adopt in carrying the
same into effect, we would have it understood that we do not confiue ourselves to
the precise details shown and described, but what we do claim is,-
The construction of flue tubes for boilers with chamber rings bent or formed in
the direction of the flue's circumference, for the purpose and in manner substantially
as shown and described.
In witness whereof, I, the said James Shepherd, have hereunto set my hand
and scal, this Thirty first day of January, in the year of our Lord One
thousand eight hundred and eighty-two.
Witness,
WILLIAM GADD,
Consulting Engineer,
64, Barton Arcade,
Manchester.
JAMES SHEPHERD. (L.S.)