Improvements in Steam-boiler Furnaces.
Year: 1889

page_text: Date of Application, 30th Nov., 1889
Complete Specification Left, 28th Aug., 1890-Accepted, 4th Oct., 1890
PROVISIONAL SPECIFICATION.
Improvements in Steam-boiler Furnaces.
I, JOHNSON MILLS of Prestwich in the County of Lancaster Engineer do hereby
declare the nature of this invention to be as follows:-
The improvements which are the subject of this invention relate to the formation
of the end portions of outer casing which forms the water chamber in a combined
flue tube furnace and water tube steam boiler such as is described in the Specification
of my invention for which Letters Patent for Great Britain were granted to me
A.D. 1888 and numbered 7077: the object of this invention is to increase the strength
and effectiveness of the aforesaid water chamber by the construction of U shaped
flanges on end plates in order to form a flanged seam where said end plates are
connected to flue tube furnace, thereby protecting the rivets at joints from destruction
by excessive heat: In this invention I form the end plate of a flue tube furnace
either dished or flat, and of a circular or other preferred form, with an opening or
aperture for flue exit: I press said end plate in suitable dies in order that the outer
edges of plate, and inner edges of aperture may thereby be bent over and form
flanges: to the flange thus formed on outer edge of plate, I either rivet or weld the
ends of outer casing which forms water chamber. The flange which is formed on
the inner edges of aperture for flue exit, I further bend to a U shape, either in a
flanging machine or by other suitable means, and to the side of flange which is thus
formed parallel to end plate, I either rivet or weld the ends of flue tube furnace :
By these means a flange seam is formed and the rivets or other connections are thereby
protected from excessive heat of furnace.
Deted this 20th day of November 1880
THOS. PRESCOTT,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Steam-boiler Furnaces.
I, JOHNSON MILLS of Prestwich in the County of Lancaster Engineer 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 :-
The improvements which are the subject of this invention relate to the formation of
the end portions of outer casing which forms the water chamber in a combined flue
tube furnace and water tube steam boiler, such as is described in the Specification of
my invention for which Letters Patent for Great Britain were granted to me
A.D. 1888 and numbered 7077.
The object of this invention is to increase the strength and effectiveness of the
aforesaid water chamber by the construction of U shaped flanges on end plates of
outer casing in order to form a flanged seam where said end plates are connected to
flue tube furnace, thereby protecting the rivets at joints from destruction by excessive
heat caused by the flame impinging against them.
In order more clearly to describe this my invention I have annexed hereunto a
sheet of drawings: in the several views shown therein similar letters refer to similar
parts.
Figs. 1 and 2 are front and edge views of a plate such as for the purposes of this inven-
tion may be employed in the formation of the end plate of a flue tube furnace: said end
plate may be either dished or flat, and of a circular or other preferred form with an
opening or aperture 6 for flue exit. I press this end plate a in suitable dies in order that
the outer edges c of plate a and inner edges d of aperture 6 may thereby be bent over and
D1

page_text: form flanges c and d as represented in Fig. 3: On the flange d' which is thus
formed on the inner edge d of aperture 6 required for flue exit, I form an additional
flange d² as shown in Fig. 4: This flange is for the purpose of jointing to either
Fox's corrugated or other type of furnace, or to flanged seam furnaces: To the
flange c formed on outer edge c of plate a as herein before described, I either rivet
or weld the ends e¹ of outer casing e which forms water chamber e³, and to the side d
of flange which as herein before described is formed parallel to end plate a I either
rivet or weld the ends g¹ of the flue tube furnace 9: By these means a flange seam
is formed and the rivets or other connections are thereby protected from excessive
heat of the furnace.
Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed, I declare that what I
claim is,
In the construction of a water cased furnace in a combined water cased furnace
and water tube steam boiler, the use of end plates for forming the end portion of the
water chamber of said water cased furnace which have the inner and outer edges
flanged or bent over in the manner and for the purpose substantially as herein before
described and as illustrated.
THOMAS PRESCOTT,
Arcade Chambers, St. Mary's Gate, Manchester, Agent for Applicant.