Improvements in Pneumatic Tyres.
Year: 1896

page_text: Date of Application, 30th July, 1896
Complete Specification Left, 30th Apr., 1897-Accepted, 5th June, 1897
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres.
I, ALEXANDER BLACK, of 62 Bothwell Circus, in the City of Glasgow, Tyre
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object to provide simple and inexpensive means
whereby pueumatic tyres when punctured may be readily repaired without
necessarily removing them from the wheel rims to which they are attached, and
in the case of built-up single tubes without undoing or opening up the fabric of
which the air tube is in part composed.
To that end I fit an auxiliary tube within the air tube of the pneumatic tyre
whether of the single tube type or of the type protected by a detachable cover,
the said auxiliary tube being alone provided with a valve for inflation. The
auxiliary tube has formed in it a small orifice so that the air within it gradually
escapes into the outer or ordinary air tube and in the course of a short interval
after inflation, e.g. half an hour or so the latter tube is alone under inflation and
the auxiliary tube in a deflated state lies loosely within it. The auxiliary air
tube is prepared from rubber free from sulphur or similar foreign matter or has
such foreign matter removed in a well-known way, and the inner surface of the
outer air tube is also freed from sulphur or like matter, so that the surfaces are
adapted for adhesion on the application to them of rubber solution or similar
cementing material.
On the occurrence of a puncture the outer air tube alone is injured, and in
order to close the puncture and again render the tube air tight a small quantity
of rubber solution or similar cementing material is injected by means of a suitable
nozzle through the punctured orifice or in proximity to it, so as to lie on the
tube surfaces in the space between the outer tube and the auxiliary tube. The
auxiliary tube is then inflated with air through the valve whereby its outer
surface is brought into close contact with the inner surface of the outer tube,
and at the point where the solution has been injected the two tubes adhere
together and close the punctured orifice. By the time the solution has properly
dried the air has escaped from the auxiliary tube into the outer air tube and
the auxiliary tube has collapsed and is not liable to injury in the event of the
occurrence of another puncture of the outer tube.
Dated this 29th day of July 1896.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicant.
I, ALEXANDER BLACK, of 62 Bothwell Circus, in the City of Glasgow, Tyre
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:-
This invention has for its object to provide simple and inexpensive means

page_text: whereby pneumatic tyres whén punctured may be readily repaired without
necessarily removing them from the wheel rims to which they are attached, and in
the case of built-up single tubes without undoing or opening up the fabric of which
the air tube is in part composed.
The invention is illustrated by the accompanying drawings,
Fig. 1 of which is a cross section of the tyre shewing the relative position of the
various parts soon after inflation;
Fig. 2 is a similar view shewing the normal position of the parts of the tyre;
Fige. 3 and 4 are cross sectional and part longitudinal views of the tyre when
the auxiliary tube has been used to repair a puncture.
In carrying out the invention, I fit an auxiliary tube A within the air tube B of
the pneumatic tyre, the said auxiliary tube A being alone provided with a valve D
for inflation, whilst the air tube B is capable of deflation in a manner hereinafter
described. The auxiliary tube A.is provided with a small orifice a covered by a
flap al formed on the inside of the tabe so that the air within it gradually escapes
into the outer or ordinary air tube B and in the course of a short interval after
inflation, e.g. half an hour or so, the latter tube is alone under inflation and the
auxiliary tube A in a deflated state lies loosely within it as represented by Fig. 2.
The auxiliary air tube A is prepared from rubber free from sulphur or similar
foreign matter or has such foreign matter removed in a well-known way, and the
inner surface of the outer air tube B is also freed from sulphur or like matter, so
that the surfaces are adapted for adhesion on the application to them of rubber
solution or similar cementing material.
On the occurrence of a puncture as shewn at E Figs. 3 and 4 the outer air
tube B alone is injured, and in order to close the puncture and again render the
tube air tight a sufficient quantity of rubber solution or similar cementing material
is applied by injection or otherwise through the puncture or in proximity to it, so
as to lie on the tube surfaces in the space between the outer tube B and the
auxiliary tube A. The auxiliary tube A is then inflated with air through the
valve whereby its outer surface is brought into contact with the inner surface of
the outer tube B, and at the point where the solution has been applied the two
tubes adhere and the puncture is thus closed. When inflating the tube A the wing
nut G of the valve is slackened back in order to permit of the escape of the air
confined within the outer air tube B, the nut G being again tightened when the
tyre has been inflated. By the time the solution has properly dried the air has
escaped from the auxiliary tube A into the outer air tube B and the auxiliary
tube A has collapsed and is not liable to injury in the event of the occurrence of
another puncture of the outer tube.
I am aware that the use of one air tube placed within another is not in itself
novel, and make no claim thereto, but the inner or auxiliary tube has been
hitherto provided with a separate valve for inflation upon the outer tube being
rendered useless by the occurrence of a puncture, and has not served as in my
invention as a means for repairing punctures in the outer air tube or built up single
tube tyre.
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 :-
1. A pneumatic tyre composed of the usual outer cover and an air tight valveless
air tube the latter having fitted within it an auxiliary air tube provided with a
valve for inflation whicb auxiliary tube has formed in it an orifice to permit of
the gradual escape of the air from it into the valveless air tube, and is adapted
to serve as a means for closing or patching punctures occurring in the main air
tube substantially in the manner described.
2. A pneumatic tyre composed of a single built up tube or tyre and having
fitted within it an auxiliary air tube provided with a valve for inflation which
auxiliary tube has formed in it an orifice to permit of the gradual escape of the

page_text: air from it into the valveless air tube, and is adapted to serve as a means for
closing or patching punctures occurring in the main air tube substantially in the
manner described.
Dated this 29th day of April 1897.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62 St. Vincent Street, Glasgow, Agent for the Applicant.