Improvements in the Manufacture of Tubes.
Year: 1896

page_text: Date of Application, 21st Nov., 1896-Accepted, 30th Jan., 1897
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Tubes.
1 HENRY SHELDON of the Firm of Sheldon & Co. Belmont Row, Birmingham,.
Manufacturers do hereby declare the nature of my said 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 the manufacture of tubes by
which I am able, to very simply and expeditiously make a tube or compound tube,
that is to say a tube the inside or body of which is composed of iron, steel or other
metal and the outside of superior or other metal, such for instance as brass.
In order that my invention may be clearly understood and more easily carried.
into practical effect I have appended hereunto a sheet of drawings illustrating one
set of processes by which the compound tube is produced.
Figure 1 is a plan showing the outer sheet of metal A. and the inner sheet of
metal B laid on ready to have the edges of A turned over.
Figure 2 shows the two sheets A and B locked together by turning over the
edges a' and a of A over the sheet B.
Figure 3 is a cross section of the two sheets A and B when locked together as
seen at Figure 2 the section being taken on line Y. Z.
Figure 4 shows the two sheets bent into a U shape as the first process in forming
the round or other shaped tube.
Figure 5 shows the next process with the upper ends of the U turned inwards to
a certain extent.
Figure 6 shows the tube completed the edges of a' and a having been brought
together.
In my new manufacture I take a sheet or strip of metal such for instance as
brass of any length, such as A, and also a sheet of cominoner metal such for
instance as B of sheef iron or steel, and by a suitable tool such as a folding flap.
on a table, the edges a' and a' of A are bent over as seen at Figure 2 in plan aud
in section at Figure 3. At this stage, if found necessary, the strip may be run
through a pair of rolls so as to pinch the edges a' and a tightly to the inner
sheet B. This compound strip is then placed in a machine and bent into a
U shape as seen at Figure 4. I then use a closing die and bring the edges inwards
as shown by Figure 5, and lastly the edges are brought together under the pressing
die or tool so as to just bring them together as seen at Figure 6. The closing or
bending process may be accomplished at more than three steps or less than three
steps. The tubes may be made round, oval, square, oblong or other sections. Of
course in making a one thickness tube of brass and such like material the bonding
process would be substantially the same.
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 I
claim is :-
First. The improvements in the manufacture of compound tubes, composed of
two thickness or sheets of metal, by the process substantially as herein set forth.
and as shown upon the accompanying drawings.
Second. The manufacture of compound tubes composed of the outer cover A.
and the inner body B by first bending tho edges of A over B then bending the

page_text: two into a U shape and then closing the tube into the desired finished shape and
either with or without intermediate rolling substantially as herein set forth aud
illustrated.
Third. The manufacture of tubes of one thickness by first bending the single
strip into a U shape and then turning over the edges into the round, oval or other
shape substantially as herein set forth.
Dated this 20th day of November 1898
GEORGE BARKER,
77 Colmore Row, Birmingham, Agent for Applicant.