Improvements in the Manufacture of Brazed Metal Tubes
Year: 1891

page_text: Date of Application, 2nd Nov., 1891
Complete Specification Left, 30th July, 1892-Accepted, 3rd Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Brazed Metal Tubes
I, LOUIS CASTIGLIONE, of 87, Clifford Street, Birmingham, Warwickshire,
Manufacturer's Manager do hereby declare the nature of this invention to be as
follows:-
This invention consists in the herein described improvements in the manufacture
of brazed metal tubes of all kinds such for instance as steel, tubes for making
the various parts of bicycles and other velocipedes, and brass and other
metal tubes.
By my invention a more perfect joint is obtained than heretofore and the tubes
are consequently stronger.
I will describe my invention by referring to the accompanying drawing on
which
Figure 1 illustrates in cross section the peculiar form in which I prefer to make
the strip of metal or alloy before bending and closing it into the tube which is shewn.
in cross section in Figure 2.
In making a brazed tube according to this invention I employ a strip of metal or
alloy which has the edges thinned down at opposite sides of the strip to about half
the thickness of the same as shewn in Figure 1, so that when the strip thus formed
is bent into a tubular shape as shewn in Figure 2, these thinned down edges will
lap one over the other and form a lapped joint of the same thickness as the other
part of the tube. The joint is then brazed in the usual way and a very much stronger.
joint, than an ordinary brazed joint, is the result as it will be seen that in my
improved joint there are two butt edges and a long flat surface in contact.
The tube thus formed may then if required be drawn down through dies to
reduce it in thickness and to harden it.
The strip of metal with the thinned down edges as above described and shewn by
Figure 1 can be produced in various ways, such as by a strip of uniform thickness
being passed through rolls or dies of the proper shape to form the thinner parts, or
these thinner parts can be formed by cutters or by grinding.
Instead of the edges of the strips being thinned down to the shape shewn on my
drawing that is to about half the thickness of the body of the strip, the said edges
may be bevelled on opposite sides of the strip so as to form an inclined joint.
Dated this 31st day of October 1891.
:
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Brazed Metal Tubes.
I, LOUIS CASTIGLIONE, of 87 Clifford Street, Birmingham, Warwickshire,
Manufacturer's Manager, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
This invention consists in the herein-described improvements in the manufacture
of brazed metal tubes of all kinds such for instance as steel tubes for making
the various parts of bicycles and velocipedes and brass and other metal tubes.
By my invention a more perfect joint is obtained than heretofore and the tubes
are consequently stronger.

page_text: which
I will describe my invention by referring to the accompanying drawing on
Figure 1 illustrates in cross section the peculiar form in which I make the strip
of metal or alloy before bending and closing it into the tube which is shewn in cross
section in Figure 2.
In making a brazed tube according to this invention 1 employ a strip of metal
or alloy A which has the edges a' a thinned down at opposite sides of the strip to
about half the thickness of the same as shewn in Figure 1, so that when the strip A
thus formed is bent into a tubular shape as shewn in Figure 2, these thinned down
edges a¹ a will lap one over the other and form a lapped joint of the same thickness
as the other part of the tube. The joint is then brazed in the usual way and a
very much stronger joint, than an ordinary brazed joint, is the result as it will be
seen that in my improved joint there are two butt edges a' a* and a long flat
surface a³ in contact.
The tube thus formed may then if required be drawn down through dies to reduce
it in thickness and to harden it.
The strip of metal A with the thinned down edges a' a² as above described and
shewn by Figure 1 can be produced in various ways, such as by a strip of uniform
thickness being passed through rolls or dies of the proper shape to form the thinner
parts or these thinner parts can be formed by cutters or by grinding.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
Making brazed metal tubes by thinning down the edges of the metal strip from
which the tube is to be formed to about half the thickness of the strip and then
bending the strip into a tube and forming a brazed joint in which there are two
butt edges and a long flat surface in contact as herein set forth and illustrated by
the accompanying drawing.
Dated this 28th day of July 1892.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.