Improvements in Flexible Metallic Tubing.
Year: 1892

page_text: Date of Application, 11th June, 1892
Complete Specification Left, 8th Mar., 1893-Accepted, 15th Apr., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by EUGENE LEVAVASSEUR, of La Jonctiere par
Rueil, Seine et Oise, France, Engineer.]
Improvements in Flexible Metallic Tubing.
°
We, THE UNITED FLEXIBLE METALLIC TUBING COMPANY LIMITED, of
96, High Holborn, in the County of Middlesex, Manufacturers, do hereby declare
the nature of this invention to be as follows:-
In the Specifications No. 9478 of 1885 and No. 15192 of 1890 is described the
manufacture of flexible metallic tubes formed by helically coiling a strip of metal
corrugated in such a manner that each helical convolution interlocks with the next.
The present invention relates to a construction of tubes of this kind in such a
manner that the interlockings of the convolutions are soldered together, the tube
being thus rendered tight against leakage. For this purpose, along with the
corrugated metallic strip while it is being coiled there is also coiled a wire of
soldering metal which lies in the hollow of each convolution in which bears the
edge of the strip constituting the next convolution. After a length of tube is
formed it is heated in a suitable stove so as to fuse the soldering metal which thus
solders together the hollow of each convolution and the edge of the next.
soldering wires may be employed, to be in the hollow of each convolution the one
under the edge and the other over the edge of the strip constituting the next
convolution. In order to ensure the soldering the corrugated strip or the soldering
wire or both should be served with a suitable soldering flux by being made to pass
through a solution thereof before the coiling is effected.
Two
When iron or steel strip is used to form the tube, it may be galvanized, tinned
or coated with other metal which is suitable for taking solder.
Dated this 11th day of June 1892.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Flexible Metallio Tubing.
We, THE UNITED FLEXIBLE METALLIC TUBING COMPANY LIMITED, of
96 High Holborn in the County of Middlesex, Manufacturers 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 :—
In the Specifications No. 9478 of 1885 and No. 15192 of 1890 is described the
manufacture of flexible metallic tubes formed by helically coiling a strip of metal
corrugated in such a manner that each helical convolution interlocks with the next.
The present invention relates to a construction of tubes of this kind in such a
manner that the interlockings of the convolutions are soldered together, the tube
being thus rendered tight against leakage. For this purpose, along with the
corrugated metallic strip, while it is being coiled, there is also coiled a wire of
soldering metal which lies in the hollow of each convolution in which bears the
edge of the strip constituting the next convolution. After a length of tube is
formed, it is heated in a suitable stove so as to fuse the soldering metal which thus
solders together the hollow of each convolution and the edge of the next.
1
The accompanying drawing shews to an enlarged scale a tube thus constructed,
partly in section, partly in elevation, the solder being indicated at S. Two

page_text: soldering wires may be employed to lie in the hollow of each convolution, the one S
under the edge as.shewn, and the other over the edge of the strip constituting the
next convolution, that is to say in the angle A. In order to ensure the soldering,
the corrugated strip or the soldering wire or both should be served with a suitable
soldering flux by being made to pass through a solution thereof before the coiling
is effected.
When iron or steel strip is used to form the tube, it may be galvanized, tinned or
coated with other metal which is suitable for taking solder.
The corrugated strip may be somewhat varied in form, but it is preferred to
make it as shewn with a high ridge R which gives flexibility, as the sides of the
ridge can move somewhat to and from each other when the tube is bent. The
corrugation should also present an internal lip L which prevents the furrow for
the solder from widening out as the strip is pressed to the mandrel. After soldering,
the tube may with advantage be compressed lengthwise.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :
A flexible metallic tube formed by helically winding on a mandrel a suitably
corrugated strip of metal along with a wire or wires of soldering metal, and fusing
the solder at the junctions of the convolutions.
Dated this 8th day of March 1893.
ABEL & IMRAY,
Agents for the Applicants.