Improvements in the Lining of Pneumatic Tyres for Road Vehicles with a Certain Composition for Preventing Escape of Air from such Tyres when Punctured.
Year: 1898

page_text: Date of Application, 8th Feb., 1898-Accepted, 14th May, 1898
COMPLETE SPECIFICATION.
Improvements in the Lining of Pneumatic Tyres for Road Vehicles
with a Certain Composition for Preventing Escape of Air from
such Tyres when Punctured.
I, WILLIAM CHARLES YOUNG, of Nos. 19 and 20, Aldgate, in the City of London,
Analytical and Consulting Chemist, 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 the application to pneumatic tyres for road vehicles
of the lining composition for preventing escape of air from such tyres when
punctured which is described in the Provisional Specification accompanying my
application for Letters Patent No. 19447 of 1897 and which composition consists
essentially of gelatine or glue and glycerine in such relative proportions that the
consistence of the said composition at ordinary temperatures is that of a firm sticky
jelly.
According to my said invention I apply the said lining composition to the said
tyres as hereinafter described.
In the case of single tube pneumatic tyres and other tubular pneumatic tyres
I insert through an aperture in the tube a sufficient quantity of the aforesaid com-
position and then close and seal the aperture by any of the well known means and
secure the tyre in place on the wheel rim and inflate the tyre and support the wheel
vertically in such a manner that it can be rotated and then apply heat to the outer
surface of the tyre and cause the wheel to rotate slowly in order to distribute the
composition over the whole interior surface of the tube. I then increase the speed
of rotation of the wheel and thereby cause the melted composition to accumulate
by centrifugal action on the outward part of the interior of the tube i.e. on the
inner surface of the tread part of the tyre. Finally I remove the heat and cool
the tyre or allow it to cool while continuing rotation of the wheel until the com-
position has solidified. By thus internally coating the tyre while it is in place
on the wheel and inflated all tension of the composition when solidified is avoided
consequently after solidification the lining within the tyre possesses the maximum
amount of elasticity inherent in the composition under ordinary conditions by
virtue of which elasticity escape of air is prevented when the tyre is punctured.
In the case of tyres of the kind termed "tubeless pneumatic tyres " I coat the
inner side thereof with the said composition in a melted state or I cast the com-
position to the shape of the inner surface of the tyre to which it is to be applied
and cause the said composition so cast to adhere to the tyre by means of pressure
and by warming the tyre or I warm the surface of the cast composition and press
it on the tyre or I secure the composition to the tyre by any other suitable means
and after applying the composition to the tyre in any of these ways I put the tyre
in place on the wheel and inflate the tyre and then rotate the wheel and apply heat
sufficient to cause the composition within the tyre to melt and increase the speed
of rotation as and for the purpose hereinbefore described and subsequently cool the

page_text: composition within the tyre or allow it to cool while continuing rotation of the
wheel as in the case of tubular tyres.
The tyre may be conveniently heated so as to cause the composition within it
to melt by mounting the wheel in a heated chamber or by so mounting it over a
vessel containing heated water that the lower part of the wheel will run in the
water.
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 improvements herein before described in the lining of pneumatic tyres for
road vehicles with the composition hereinbefore referred to which improvements
consist essentially in subjecting the tyre after insertion therein of the said com-
position and while in place on the wheel and inflated to a sufficient degree of heat
to cause liquefaction of the composition within the tyre and rotating the wheel in
a vertical plane at a sufficient speed to cause the liquified composition to accumulate
on the interior of the tread of the tyre and afterwards cooling, the tyre and the
composition within it or allowing them to cool while continuing rotation of the
wheel until solidification of the composition has taken place.
Dated this Eighth day of February 1898.
W. T. WHITEMAN,.
Agent for the Applicant.