Improvements in Tubes for Multitubular Bollers and other similar purposes, and Methods of Producing same.
Year: 1899

page_text: Date of Application, 20th Mar., 1899
Complete Specification Left, 14th Dec., 1899-Accepted, 27th Jan., 1900
Improvements in Tubes for Multitubular Bollers and other similar
purposes, and Methods of Producing same.
I, SIDNEY STUART WALKER, Engineer, of Bishopton House, Stratford on Avon,
in the County of Warwick, do hereby declare the nature of this invention to
be as follows:
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My improvements consist in lining or covering iron or steel tubes with copper
or brass tubes. This I do, in the former instance, by inserting a copper or brass
tube, made in the ordinary manner, within a steel or iron tube and drawing.
them together on a plug or mandril through a die in such a manner as to force
the two tubes into close contact. Or in the latter case by inserting the iron or
steel tube within the copper or brass tube and drawing them together as before
mentioned. Instead of drawing them through a die, a plug may be drawn
through the interior of the inner tube in such a manner as to expand it to fit
the outer tube or the inner tube may be expanded by hydraulic pressure; the
bimetallic tube may be fluted or corrugated.
1011
.
. 1000
Improvements in Tubes for Multitubular Boilers and other similar
purposes, and Methods of Producing same.
I, SIDNEY STUART WALKER, of Bishopton House, Stratford-on-Avon, in the
County of Warwick, 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:-
My invention has for its object improvements in tubes for multitubular boil-
ers and other similar purposes where the metal used for the required strength
is liable to corrosion and refers particularly to the manufacture of iron or steel
tubes which require for such purpose a lining or covering formed of copper or
brass tubes and which consists in the method or mode of drawing the two tubes
of different metals together so as to form one practically solid tube.
In carrying my invention into effect I insert an ordinary copper tube within
a weldless or other steel or iron tube or vice versa, and by drawing a plug through
the inner tube I expand the same into close contact with the outer tube or I
may controll the plug in a stationary position. by a suitable connecting rod
and then draw the tube over the plug with similar effect while the said plug
may be provided with rollers upon its periphery and be rotated during its pas-
sage through the tube in the manner well known in connection with ordinary
tube expanding and I may expand the inner tube by applying hydraulic or
other fluid pressure including atmospheric air or other gases within the inner

page_text: tube or a hardened steel ball may be forced through the inner tube by hydraulic
or other similar pressure.
The interior of the outer tube may be provided with a roughened surface as
also the exterior of the inner tube by which a more perfect contact and grip of
the metals is obtained when the two are drawn together.
After the inner tube has been expanded as before described I may draw the
double tube down to the required size in the usual way either with or without
a mandrel and I may effect a reduction in the thickness of the metal by drawing
the double tube through a die simultaneously with the expansion of the inner
tube or separately while at the same time such bi-metallic tubes may be fluted
or corrugated to meet the various requirements to be met with.
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:
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1st In the manufacture of bi-metallic tubes for multitubular boilers and the like
expanding the inner tube to form a close contact with the outer tube substan-
tially such as and for the purpose herein set forth.
2nd In the manufacture of bi-metallic tubes for multitubular boilers and the
like expanding the inner tube and contracting the outer tube substantially as
and for the purpose herein set forth.
3rd In the manufacture of bi-metallic tubes for multitubular boilers and the
like roughing the exterior, of the inner tube or the interior of the outer tube
or both substantially as and for the purpose herein set forth.
LEWIS WM. GOOLD,
Agent for Applicant, 5, Corporation Street, Birmingham.