IMPROVEMENTS IN STEAM BOILERS
Year: 1882

page_text: LETTERS PATENT to William Arnold, of Barnsley, in the County of York,
for an Invention of "IMPROVEMENTS IN STEAM BOILERS."
PROVISIONAL SPECIFICATION left by the said William Arnold at the
Office of the Commissioners of Patents on the 9th February 1882.
WILLIAM ARNOLD of Barnsley in the County of York.
STEAM BOILERS."
"IMPROVEMENTS IN
My Invention in the first place relates to and has for its object the imparting of
increased strength and heating surface to the internal flues and fire boxes of steam
boilers.
The flues of steam boilers as now constructed are incapable of sustaining the
high compressive strain, now everywhere required, without greatly increasing the
thickness of metal, thereby retarding the passage of heat and rendering the plates
more liable to be injured by the action of the fire.
In carrying out the first part of my Invention I make the rings or parts of which
such flues and fire boxes are constructed in the form of the frustrum of a cone that
is barrel shaped or in the form a double cone, or these figures may be made in two
portions and joined together by flanges or otherwise and these barrel shaped rings
or double cones may be joined together by any known means but I prefer to join
them by flanging the ends of such rings or parts.
Secondly in giving the desired form to such parts or rings I mount a suitably
formed roll on a long shaft in conjunction with three other rolls having a corre-
sponding configuration in a strong frame.
The lower roll is keyed on a long sliaft and driven by gearing at the other end,
the journal on the front end of this shaft is supported in a bearing formed in a
beam which is so constructed as to turn on a centre at one end so as to leave the
front of the machine open for placing the ring to be operated upon in the machine.
The upper rolls run loose in bearings in slides which are made to slide in the sides
..מ

page_text: of the machine by means of screws operated upon by worm gear and hand wheel.
One of the upper rolls is formed of several parts the end ones being keyed to the
shaft and the intermediate ones running loose so as to allow the difference of
velocity in the different parts.
The tube or ring to be operated upon is placed while hot on the first mentioned
roll and the beam is brought round into position to support the end journal of the
said roll put in motion. The other rolls are made to descend by means of the worm
gear gradually causing the tube to assume the required form while the two other
rolls in levers are made to press the ends of the tube against one of the other
rolls by means of screw and hand wheel, and causing them to take the form of
flanges.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Arnold in the Great Seal Patent Office on the
9th August 1882.
WILLIAM ARNOLD of Barnsley in the County of York.
STEAM BOILERS."
"IMPROVEMENTS IN
My Invention in the first place relates to and has for its object the imparting of
increased strength and heating surface to the internal flues and fireboxes of steam
boilers. The flues of steam boilers as now constructed are incapable of sustaining
the high compressive strain now everywhere required without greatly increasing
the thickness of metal thereby retarding the passage of heat and rendering the
plates more liable to be injured by the action of the heat.
In order that my Invention may be fully understood I will now describe the
same by reference to the accompanying Drawings :—
Fig 3 plan.
Fig 4 and 5 sections of various forms of flue or fire boxes.
In carrying out the first part of my Invention I make the rings or parts of
which such flues and fireboxes are constructed in the form of the frustrum of a
lune that is barrel shaped or in the form of a double cone or the figures may be
made in two portions and joined together by flanges or otherwise as shown in
sections a, b, c, d and these barrel shaped rings or double cones may be joined
together by any known means but I prefer to join them by flanging the ends of
such rings or parts. Secondly-in giving tho desired form to such parts or rings.
I mount a suitably formed roll A on a long shaft in conjunction with three other
rolls B CD having a corresponding configuration in a strong frame E E see
Figs. 1, 2, 3.
The same letters refer to the same parts in each Figure.
The lower roll A is keyed on the long shaft and driven by gearing at the other
end, the journal on the front end of this shaft being supported in a hearing formed
in the beam I which is so constructed as to turn on the centre J at one end so as
to leave the front of the machine open for placing the ring to be operated upon in
the machine. The three upper rolls run loose in bearings in the slides K K which
are made to slide in the frame of the machine by means of the screws M M operated
upon by the worm gear 0 0 and hand wheel P.-The roll C is formed of several
parts the end ones being keyed to the shaft and the intermediate ones running
loose so as to allow for the difference of velocity in the different parts.-The tube
or ring to be operated upon is placed while hot on the roll A, as shown in Fig 1
and the beam I is brought round into position to support the end journal of the
roll A and the roll put in motion.
The rolls B CD are made to descend by means of the worm gear; gradually
causing the tube to assume the required form while the two rolls R R in the
levers L L are made to press the ends of tube against the roll D by means of screw S
and hand wheel W causing them to take the form of flanges.
Having described the nature of my Invention and explained the mode of working

page_text: it I would have it understood that what I consider to be novel and original and
I claim as my Invention is as follows:—
(1) The construction of flues and fire boxes of barrel or cone shaped rings or
plates.
.
(2) The construction and use of a machine for giving the required form to the
said rings or plates as described and illustrated in the accompanying Drawings.
In witness whercof I the said William Arnold have hereunto set my hand
and seal this Seventh day of August in the year of our Lord One thousand
eight hundred and eighty two.
Witness :-
JNO. GILLOTT,
Barnsley.
WILLIAM ARNOLD. (L.S.)
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