Improvements in or relating to Flexible Metallic Tubing.
Year: 1889

page_text: Date of Application, 17th Oct., 1889
Complete Specification Left, 10th July, 1890-Accepted, 16th Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in or relating to Flexible Metallic Tubing.
I OSCAR THOMAS BANKS of No. 15 Lavender Road Clapham Junction in the
County of Surrey Engineer do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in or relating to flexible metallic tubing of
the kind described in the Specification of Letters Patent No. 9478 of the year 1885.
It consists in means of rendering such tubing proof against leakage at the folds when
conveying liquids, air, or gases, at high or low pressures.
For this purpose I construct the metallic tubing by spirally winding and inter-
locking the edges of strips of metal previously shaped so that it approximates to a
form of S shape in cross section in the manner described in the Specification of
Letters Patent above referred to, except that I dispense with the packing cord therein
referred to as being inserted between the joining edges of the strips of metal while
being spirally wound and interlocked.
The spirally wound tube or sheathing thus produced is incapable of conducting air
gas or liquid without leakage but forms a receptacle or covering in which india rubber
or other suitably flexible water tight air tight or gas tight tubing may be placed and
retained.
By this means the enclosed tubing of light construction is rendered capable of sus-
taining considerable internal pressure and the sheathing or covering is capable of
withstanding external wear or damage while protecting the enclosed tubing from
injuries which in an unprotected state it would be incapable of withstanding. The
enclosed tubing which thus sustains the required pressure may readily be renewed
when worn out.
Spirally wound flexible tubing constructed in the manner herein before described is
less liable to leakage than such tubing constructed with an inserted packing cord
intended to avoid leakage at the junction of the edges of the metallic strips of which
such tubes are formed.
Unions or junctions may be inserted in the usual way to be secured by "wiring" or
by "clamping nuts" care being taken to secure a sufficient length of the inserted
tubing to allow for turning over a portion on the outer side of the spirally
wound sheathing or tube at the extremities intended to receive the unions or
junctions.
COMPLETE SPECIFICATION.
Improvements in or relating to Flexible Metallic Tubing.
I OSCAR THOMAS BANKS of No. 15 Lavender Road, Clapham Junction in the
County of Surrey 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 :-
This invention relates to improvements in or relating to flexible metallic tubing of
the kind described in the Specification of Letters Patent No. 9478 of the year 1885. It
consists in means of rendering such tubing proof against leakage at the folds when
conveying liquids, air or gases at high or low pressures.

page_text: For this purpose I construct the metallic tubing by spirally winding and inter-
locking the edges of strips of metal previously shaped so that it approximates to a
form of S shape in cross section in the manner described in the Specification of Letters
Patent No. 9478 above referred to, except that I dispense with the packing cord therein
referred to as being inserted, between the joining edges of the strips of metal while
being spirally wound and interlocked.
The spirally wound tube or sheathing thus produced is incapable of conducting,
air, gas or liquid without leakage but it forms a receptacle or covering in which
india rubber or other suitable, flexible, water-tight, air-tight or gas-tight tubing may
be placed and retained.
In the accompanying drawing
Figure 1 is a sectional view of the spirally wound tube or sheathing and the enclosed
flexible tubing.
Figure 2 is an outside view of the flexible tubing carried through a short length of
the spirally wound tube or sheathing.
By the means herein before described the enclosed tubing A of light construction is
rendered capable of sustaining considerable internal pressure and the spirally wound
tube or sheathing B is capable of withstanding external wear or damage while pro-
tecting the enclosed tubing A from injuries which in an unprotected state it would be
incapable of withstanding.
The enclosing tubing A which thus sustains the required pressure may readily be
renewed when worn out.
Spirally wound flexible tubing constructed in the manner hereinbefore described is
less liable to leakage than such tubing constructed with an inserted packing cord
intended to avoid leakage at the junction of the edges of the metallic strips of which
such tubes are formed.
Unions or junctions may be inserted in the usual way to be secured by "wiring"
or by clamping nuts care being taken to secure a sufficient length of inserted tubing
to allow for turning over a portion on the outer side of the spirally wound tube or
sheathing as shown at C in Figure 1.
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
The combination of an india rubber or other suitable flexible tube, with a spirally
wound tube or sheathing, whereby the enclosed flexible tube is protected against
considerable internal pressure and the effects of external wear substantially as
described.
Dated this 10th day of July 1890.