Improvements in Steam and Hot Water Boilers of the Vertical Тур
Year: 1898

page_text: Date of Application, 10th Mar., 1898
Complete Specification Left, 8th Dec., 1898-Accepted, 25th Feb.,
1899
PROVISIONAL DEMULTICATION.
Improvements in Steam and Hot Water Boilers of the Vertical
Туре.
JOHN SCHOFIELD, 39, Oxford Street, Werneth, Oldham, Foreman Boilermaker, do
hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in steam and hot-water boilers of the
vertical type.
In the construction of such boilers I employ a particular form of internal tube
plates. I term them upper and lower plates and I press or otherwise work into
ordinary flat or cambered plates a series of concentric steppings, the number varying
according to the diameter of the boiler.
When fixed in position the surfaces of the upper plate occupy the same relative
positions to the shell of the boiler as the corresponding portions in the lower
plate.
By this arrangement I am able to connect to the two plates a great number of
vertical smoke tubes and thus increase the evaporative power of this class of
boiler.
1 1000
JOHN SCHOFIELD.
COMPLETE SPECIFICATION.
Improvements in Steam and Hot Water Boilers of the Vertical
Type.
I, JOHN SCHOFIELD, 39, Oxford Street, Werneth, Oldham, Foreman Boilermaker,
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:-
-
My invention relates to improvements in steam and hot-water boilers of the
vertical type.
In the construction of such boilers I employ twin tube-plates of a particular form
see B.
I press or otherwise work into ordinary flat, or cambered metal plates a series of
concentric steppings A varying in number according to circumstances and as I may
determine from time to time. To these special plates I connect vertical tubes C
through which the flames and hot gases resulting from combustion pass to the
uptake or chimney.
I thereby add valueable heating surface and so increase the evaporative power and
general efficiency of such boilers.

page_text: I use the term twin-tube plates as both are preferably identical in shape but it
does not follow that this similarity will always be maintained. I may vary the
depth and diameter or any or all of the steppings of either the lower or upper plate.
All the steppings are shown uniform in width and as adaptable for one ring of
tubes only but by increasing the distance between each riser two or more rings of
tubes can be supported in each stepping. Thus the number of steppings in each
boiler is regulated by the width I give to them as well as the diameter of the boiler-
shell. Each riser of the steppings is drawn as falling away from the perperdicular
and rounded at top and bottom or in other words following the radii of small circles
but I may make the risers perperdicular or nearly so, or some perperdicular and
the others as shown.
The tube-plates are shown as being in certain relative positions to the top and
bottom of the boiler but this is subject to alteration as I may reduce or increase the
length of the tubes and thereby bring the plates nearer to each other or vice versa.
The pitch or camber of the tube-plates is ordinarily one fifth of the diameter but
this I may vary by sometimes using a deeper and at others a shallower pitch.
The tube-plates appear as rising to the centre in position but I may invert them
or invert one plate only, the other remaining as shown.
The surface of the steppings may be flat, cambered, dished or fall slightly to the
outside edge, preferably the latter.
The thickness of the plates is determined by their diameter and the working
pressure of the boiler. I vary the diameter of the vertical tubes, using tubes of a
less diameter for small boilers and vice versa and I may employ tubes of different
diameter in the same boiler.
The tubes may radiate or be fitted sinuously from the centre and they can also be
of various thicknesses.
The method of attaching the tube-plates to the smoke-box and furnace rings is
indicated on the drawing but it is subject to modification.
longer shoulder than is represented.
I may give the plates a
I show the uptake rising through the centre of the boiler but I may fix it at the
side.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed I declare that what
I claim is
The construction of steam boilers of the kind referred to with upper and lower
internal tube-plates having concentric steppings of any contour which enable vertical
tubes to be connected to them as described and substantially as shown in the
annexed drawings.
Dated this Sixth day of Decomban 1900