Improved Flexible Elastic Tubing, applicable as a Back-pressure Valve.
Year: 1896

page_text: Date of Application, 18th Feb., 1896
Complete Specification Left, 18th Nov., 1896-Accepted, 2nd Jan., 1897
PROVISIONAL SPECIFICATION.
Improved Flexible Elastic Tubing, applicable as a Back-pressure
Valve.
I WARWICK BROOKES of 350 Oxford Road, Manchester, in the County of
Lancaster, Photographer, do hereby declare the nature of this invention to be
as follows:-
This invention relates to an improved form of india rubber or other flexible and
elastic tubing which can be cut into short lengths and used in all cases where it is
desirable to force air or other fluid through a tube and to prevent the return of
the same, that is to say, where the action of a back-pressure valve is required.
This improved tubing is not circular in transverse section like an ordinary tube,
but is absolutely flat (that is, of a ribbon or tape form) having a slit in its centre
throughout its length. This slit has perfectly sharp edges or ends, and its sides
touch each other. The flat tube thus made is then twisted spirally or coiled into a
screw form, which has the effect of pressing the interior surfaces of the flat tube
still more closely together, and it is vulcanized and finished in that form.
This twisted or coiled flat tubing may be made of any convenient dimensions as
regards thickness and width and length of internal slit according to the purposes to
which it is to be applied.
For example a tube of this description cut into suitable lengths may be used to
form a simple valve for inflating pneumatic tyres, footballs, air cushions and the
like.
The inner end of the tube remains flat and closed and acts as a back pressure
valve the outer end being opened and fitted over a short metal or other ordinary
tube, nozzle, or mouthpiece to which an inflator may be applied, the air entering the
article freely, but being unable to return as the internal pressure has no tendency
to open the slit but on the contrary tends to close the same more securely, especially
when the flat tube is twisted spirally as above described.
Instead of making this flat twisted tubing in long pieces it may be made in short
lengths, one end being made round in section for convenience in attaching it to the
metal or other tube and the remainder flattened and twisted or coiled, so as to
act as a back pressure valve; or the improved tubing may be made in any
suitable manner so long as it has the combined flattened and twisted or coiled form
above mentioned.
Dated this 17th day of February 1802
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
Improved Flexible Elastic Tubing, applicable as a Back-pressure
Valve.
I WARWICK BROOKES, of 350 Oxford Road, Manchester, in the County of
Lancaster, Photographer, 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 an improved form of india rubber or other flexible and

page_text: elastic tubing which can be cut into short lengths and used in all cases where
it is desirable to force air or other fluid through a tube and to prevent the
return of the same, that is to say, where the action of a back-pressure valve is
required.
My invention will be readily understood from the following description on
reference to the accompanying sheet of drawings.
My improved tubing is not circular in transverse section like an ordinary tube,
but is absolutely flat (that is, of a ribbon or tape form, as seen at Fig. 1) having a
slit a in its centre throughout its length. This slit a has perfectly sharp edges or
ends a¹ a² so that its sides touch each other. The flat tube thus made is then
twisted spirally or coiled into a screw form (see Fig. 2), which has the effect of
pressing the interior surfaces of the flat tube still more closely together, and it is
vulcanized and finished in that form.
This twisted or coiled flat tubing may be made of any convenient dimensions as
regards thickness and width and length of internal slit, according to the purposes
to which it is to be applied.
For example a tube of this description cut into suitable lengths may be used to
form a simple valve for inflating pneumatic tyres, footballs, air cushions and the
like.
The inner end of the tube remains flat and closed and acts as a back pressure
valve, the outer end being opened and fitted over a short metal or other ordinary
tube, nozzle, or mouthpiece 6 (see Fig. 3), to which an inflator may be applied,
the air entering the article freely, but being unable to return as the internal
pressure has no tendency to open the slit but on the contrary tends to close the
same more securely, especially when the flat tube is twisted spirally as above
described. The part 6 and the end of the elastic tube may be fitted in the end of
a metal tube c fixed in the inner tube of the tyre and fixed into position by the
screw cap d, (see Fig. 4). Or the part 6 and the end of the elastic tube may be
fitted into the end of a rubber tube el forming part of the inner or inflatable tube
of the tyre and such tube c¹ may be supported by a metal tube c2 forming part of
the rim of the wheel or fixed thereto (as seen at Fig. 5) the whole being held
together by the screw cap d. A dust cap b¹ may be employed as usual on the
nozzle b.
Instead of making this flat twisted tubing in long pieces it may be made in
short lengths, oue end being made round in section for convenience in attaching it.
to the metal or other tube and the remainder flattened and twisted or coiled, so as
to act as a back pressure valve, (see Fig. 6) and this tubular part may be made
thicker than the flattened part. Or the improved tubing may be made in any other
suitable manner so long as it has the combined flattened and twisted or coiled form
above mentioned.
The outside of the tubing may be strengthened by a covering of canvas or
similar fabric vulcanized thereto.
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 :-
The improved flexible elastic tubing applicable as a back pressure valve made
partly or entirely in flattened and twisted or coiled ribbon form substantially as
hereinbefore set forth.
Dated this 17th d...
1000
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.