Year: 1899

page_text: Date of Application, 30th Nov., 1899
Complete Specification Left, 22nd Aug., 1900-Accepted, 6th Oct., 1900
I, GEORGE HOOKHAм, of 7 & 8, New Bartholomew Street, Birmingham, Manu-
facturer, do hereby declare the nature of this invention to be as follows:
In carrying out my improvements, according to one method, I commence by
winding a close helical spring of steel or other elastic metal. I cover this with a
waterproofing material or fabric, which, preferably, consists of a tape or strip
of waterproofed fabric cut on the bias. This is laid longitudinally on the helical
spring, the edges slightly overlapping. The flexible tube thus formed is then
served with a coating of india-rubber solution or other waterproofing fluid. When
dry, the whole is wound with soft wire such as copper or other annealed metal.
Preferably this wire should be flat or a meniscus in section.
Dated this 29th day of November 1899.
1, GEORGE HOOKHAM, 4, Bartholomew Street, in the City of Birmingham,
Manufacturer, 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 flexible tubing and has for its object to provide tubing
of great flexibility which will be capable of resisting considerable fluid pressure
if desired, and of simple and cheap construction.
My invention consists in providing waterproof lining between two or more
concentric coils of helically coiled wire. Where two coils only are used, my
invention further consists in providing for the inner coil, a closely coiled and
therefore incompressible spring, made of steel or any other suitable elastic material
and for the outer coil soft wire preferably flat or a meniscus in section.
Referring to the accompanying drawings which illustrate one form of my in-
vention, Figure 1 shows a portion of the tubing with the coil partly stripped
shewing the waterproof lining between the coils and Figure 2 is a section of the
outer wire. a is a closely coiled spring made of steel or any other suitable
elastic material, covered with waterproof fabric b cut on the bias, which is laid on
longitudinally with its edges slightly overlapping, this is then coated with rubber
solution or other waterproofing fluid, and when dry a soft wire c is wound 'over
the whole, in the opposite direction to that in which the spring a is wound. This

page_text: soft wire is made of copper or other such annealed metal, and is preferably flat
or of a meniscus section.
The waterproof fabric b may if desired be coiled on to the spring a and have
its helical edges slightly overlapping.
It is obvious that more than two concentric coils of wire may be used having
waterproof lining, covering each coil but the outside one.
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 what
I claim is:-
'
1. In flexible tubing, providing waterproof lining between an internal closely
coiled hard wire coil and an external soft wire coil, substantially as described.
2. A flexible tube consisting of a closely wound hard wire spiral on which
bias cut waterproofed fabric strips are laid, with overlapping edges, these being
then coated with waterproofing fluid and externally wound with a soft wire of
flattened forin, substantially as described.
3. The improved flexible tubing herein before described with reference to the
accompanying drawings.
00
1 T
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester, Agents.