Improvements in the Construction of Metallic or other Tubes.
Year: 1893

page_text: Date of Application, 13th Mar., 1893
Complete Specification Left, 13th Dec., 1893-Accepted 20th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Metallic or other Tubes.
I, VIVIAN BOLTON DOUGLAS COOPER, of 5 Victoria Street, in the City of
Westminster, Civil Engineer, do hereby declare the nature of this invention to be
as follows:-
My invention relates to an improved method of constructing tubes out of strips
of sheet metal or other material, and it consists in using two strips wound or coiled
helically and inserted the one within the other, the helix of one tube being right
handed and the other left handed.
In carrying my invention into practice I take a strip of the metal or material to
be used, and by means of a lathe or its equivalent I wind or coil the strip helically
on a mandrel until its edges butt against each other.
I then take another strip and wind or coil it helically in the reverse direction
over the first strip, and after pinning or otherwise fixing the ends of the two strips
to one another I withdraw the mandrel and braze or hard solder the two parts
together. Instead of brazing or soldering the two parts together I may dip them
in a galvanizing bath and so fix them together.
It will be understood that as the edges of the strips do not overlap, the tube
when finished is smooth on both the inside and the outside, and that as the strips
are wound in opposite directions they interlock and do not therefore require to
have collars or plugs attached to their ends to keep them up taut whilst being
brazed or otherwise fixed together.
There may be other and better methods of constructing this tube, and I there-
fore do not limit myself to the method hereinbefore described.
To obtain a tube of increased thickness I may instead of using strips of metal
of increased thickness, use three or more strips placed one inside the other aud
each wound or coiled in the reverse direction to the other.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Construction of Metallic or other Tubes.
I, VIVIAN BOLTON DOUGLAS COOPER, of 5 Victoria Street, in the City of
Westminster, Civil 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 relates to an improved method of constructing tubes out of strips
of sheet metal or other material, and it consists in using two strips wound or coiled
helically and inserted the one within the other, the helix of one strip being right
handed and the other left handed.
In the accompanying drawing which illustrates my invention,
Figure 1 shows the construction of a tube out of two strips, and Figure 2 shows
the construction of a tube out of three strips.

page_text: In carrying my invention into practice I take a strip of the metal or material to
be used and by means of a lathe or other suitable machine 1 wind or coil the strip
helically on a mandrel until its edges butt against each other.
I then take another strip and wind or coil it helically in the reverse direction
over the first strip inserting between the two strips the fixing medium.
If the tube is made of metallic strips I braze or hard solder them together either
before or after, or partially before and partially after, the mandrel is withdrawn. A
convenient method is to roll in between the two strips a thin sheet of brass coated
with the necessary flux. Instead of brazing or soldering the two parts together 1
may dip them in a galvanizing bath and so fix them together.
When the strips used for making the tubes are of any other material than metal,
the fixing medium to be used to secure them together is determined by the nature
of the material used.
It will be understood that as the edges of the strips do not overlap, the tube
when finished is smooth on both the inside and the outside and that as the strips
are wound in opposite directions they interlock and do not therefore require to
have collars or plugs attached to their ends to keep them up taut and in place
whilst being brazed or otherwise fixed together.
To obtain a tube of increased thickness I may instead of using strips of increased
thickness use three or more strips placed one inside the other and each wound or
coiled in the reverse direction to the other.
There may be other and better methods of carrying out this construction of
tube, and I do not therefore limit myself to the method hereinbefore described.
T
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,
claim is :-
A tube constructed of two or more strips of metal or other suitable materia
wound or coiled helically so that the edges butt against each other, the helix o
each strip being in the opposite direction to the helix of the next or adjacent
strip, as set forth.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.