Improvements relating to the Flues of Steam Boilers.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements relating to the Flues of Steam Boilers.
I, GEORGE WILLIAM HAWKSLEY, of the Brightside Boiler Works, City of
Sheffield, Manufacturer, do hereby declare the nature of my invention to be as
follows:-
My present invention refers more particularly to a method of fixing the class
of flue described in the Specification of Letters Patent No. 690 of 1861, to the
end plates of steam boilers, the object being to enable such flues to be readily
removed when necessary with a comparatively small amount of labour and
cost.
The flue referred to is made in lengths of different diameters used alternately
to permit of expansion and contraction with a minimum of damage.
I propose to construct the flue so that the front end shall be of the larger
diameter and the back end shall be of the smaller diameter, and I cut out the
opening in the front end of boiler, large enough to permit the passage of the ring
of rivets round the larger diameter of the flue, through the said opening; the
opening at the back of boiler is made to suit the smaller diameter of flue:
I make the front end of the flue to project through the end plate, and I secure
it by means of a ring of angle iron rivetted to both the flue and to the outside
of boiler end, or instead of angle iron, I form the end of the flue into a flange
and rivet it to the boiler end.
I fix a ring of angle iron upon the back end of flue, the diameter of the ring
not exceeding that of the circle of rivets before mentioned.
To remove the flue it is only necessary to cut out the circle of rivets at each
end, when it may be drawn through the front opening.
Dated the 17th do
T
1007
Improvements relating to the Flues of Steam Boilers.
I, GEORGE WILLIAM HAWKSLEY, of the Brightside Boiler Works, City of
Sheffield, Manufacturer, do hereby declare the nature of this invention and in
what manner the same has to be performed, to be particularly described and
ascertained in and by the following statement:-
-
My present invention refers more particularly to a method of fixing the class

page_text: of flue described in the Specification of Letters Patent No. 690 of 1861, to the
end plates of steam boilers, the object being to enable such flues to be readily
removed when necessary for repairs or the like, with a comparatively small
amount of labour and cost.
The annexed sheet of drawings illustrates how my invention may be carried
into practice.
Fig. 1, represents a sectional elevation of a boiler with flue fixed according to
my invention.
Fig. 2, section of end of boiler with modified method of fixing flue.
Fig. 3, similar section of another method.
The flue referred to is made in lengths of different diameters placed alternately
to permit of its expansion and contraction with a minimum of damage.
The boiler shell is marked B, the flue F, and the end plates P and P¹, in each
of the figures.
I construct the said flue with its front end which contains the furnace F¹, of
the larger diameter, and the back end F2, of the smaller diameter, and I make
the opening in the front plates P, of the boiler large enough to permit the
passage of the rings of rivets R, round the larger parts of the flue, through
the said end opening, the opening in the back plates P¹, being made to suit the
smaller part of the-flue.
I make the front end of the flue F, to project through the end plate P, as
shown in Fig. 1, and I secure it by a ring of angle iron A, which is rivetted to
both the flue and to the outside of the end plates P, of the boiler.
When therefore the ring of rivets R2, are removed, and also those at the back
end R³, the flue is free to be drawn bodily through the front opening.
Instead of rivets I may use bolts, but rivets are preferred.
Instead of using angle iron, I may form a flange from the continuous metal of
the flue if desirable.
According to the modification shown in Fig. 2, I form a flange round the open-
ing in the front plates P, and slightly enlarge the extreme end of the flue, and
secure them together by a single ring of rivets R.
Or according to the modification shown in Fig. 3, I form a flange round the open-
ing as aforesaid, and interpose a metal ring G, between the said flange and the
periphery of the tube, securing them together by rivetting or bolting.
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:-
1. The improvements in fixing the flues of steam boilers, (such as described in
my former Patent No. 690 of 1861), to the front plates of the boilers, for the
purpose specified, and substantially as hereinbefore described and shown.
2. The methods of securing the flues F, to the end plates P, of steam boilers,
to enable the flue to be readily removed, and withdrawn, as hereinbefore des-
cribed and illustrated.
1
1000
ROBT. F. DRURY, C.P.A.,
Agent for Applicant, Bank Buildings, George Street, Sheffield.