An Improvement in Flexible Metallic Tubing.
Year: 1892

page_text: Date of Application, 19th Dec., 1892
Complete Specification Left, 14th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by WILLIAM HENRY KANZON BOWLEY, Managing
Director of the United Flexible Metallic Tubing Company, Limited, of
96, High Holborn, London, W.C., at present of Grand Hotel, Terminus,
Gare St. Lazare, Paris, France.]
An Improvement in Flexible Metallic Tubing.
I, OLIVER IMRAY of No. 28 Southampton Buildings in the County of London,
Chartered Patent Agent, do hereby declare the nature of this invention to be
as follows:-
My invention relates to the flexible metallic tubing which is constructed by
helically coiling a continuous strip of metal corrugated in such a manner that each
convolution has its marginal parts engaged in and interlocked with the marginal
part of the next convolution.
The object of my improvement is to render the interlocked parts tight against
leakage without interfering with flexibility of the tube. For this purpose, besides
corrugating the strip of metal in such a manner that the margin of each.
convolution forms a loop, the one interlocking with the other, 1 corrugate the
middle part of the strip so that it projects in Ū form outwards. The interlocked
margins being squeezed together, it may be with a strip of packing material
interposed, in such a manner that their jointing is impervious to fluid, present
considerable rigidity which would interfere with the flexibility of the tube, but by
the Ushaped corrugation of the middle of the strip allowing the limbs of the U
to move a little to or from each other, the tube is rendered sufficiently Hexible
notwithstanding the rigidity at the jointing of the convolutions.
Dated this 19th day of December 1892.
ABEL & IMKAI,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Flexible Metallic Tubing.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, in the County of London,
Chartered Patent Agent, do hereby declare the nature of this invention and
in what manuer the same is to be performed to be particularly described and
ascertained in and by the following statement:-
My invention relates to the flexible metallic tubing which is constructed by
helically coiling a continuous strip of metal corrugated in such a manner that each
convolution has its marginal parts engaged in and interlocked with the marginal
part of the next convolution.
The object of my improvement is to render the interlocked parts tight against
leakage without interfering with flexibility of the tube. For this purpose, besides
corrugating the strip of metal in such a manner that the margin of each
convolution forms a loop, the one interlocking with the other, I corrugate the
middle part of the strip so that it projects in U form outwards.
The interlocked margins being squeezed together, it may be with a strip of
packing material interposed in such a manner that their jointing is impervious to
Huid, present considerable rigidity which would interfere with the flexibility of the
tube, but by the U shaped corrugation of the middle of the strip allowing the
limbs of the U to move a little to or from each other, the tube is rendered
sufficiently flexible notwithstanding the rigidity at the jointing of the convolutions.
017

page_text: Fig. 1 of the accompanying drawing shews in perspective a portion of the metal
strip before corrugation.
Figs. 2, 3 and 4 shew the corrugation effected by the successive rollers between
which the strip is passed, and Fig. 5 shews the tube produced partly in section,
partly in elevation.
The strip A is first so corrugated as shewn in Fig. 2 as to produce a high
ridge B about midway between the two borders C and D.
By the next rolling operation as shewn in Fig. 3 a lip at the margin of C is
turned upwards to give a hook form and a lip at the margin of D is turned
downwards also to give a hook form. These lips are by the next rolling, as shewn
in Fig. 4, bent somewhat inwards, so that when they are rolled on to the mandril
the lip of D in each convolution engages under the lip of C in the next
convolution, and both these lips are flattened down together between the borders D
and C of which they are the respective lips. Although in Fig. 5, for the sake of
clear illustration, the lips and borders forming four thicknesses of metal between
the ridges B are shewn as if there were thin spaces between them, they are in
fact, in the formed tube, pressed quite close together, so that no fluid can break
out between them.
In winding the strip on the mandril a cord or a couple of cords of asbestos or
other suitable material served with white lead or the like may be coiled along with
it so as to fill the spaces E F.
Owing to the height of each ridge B, the sides of which can be moved a little
to or from each other, the tube can be bent more or less without in any way
disturbing the jointing of the convolutions to each other.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
A flexible metallic tube consisting of a strip of metal helically wound on a
mandril, the said strip being so corrugated as to present a high ridge in the
middle of each convolution with a border and hooked lip on each side engaged and
pressed together with a corresponding border and hooked lip of the next convolution,
substantially as and for the purpose set forth.
Dated this 14th day of September 1893.
ABEL & IMRAY,
Agents for the Applicant.