An Improved Method and Composition for Making Pneumatic Tyres Puncture-proof.
Year: 1897

page_text: Date of Application, 5th July, 1897
Complete Specification Left. 8th Sept. 1897-Accepted. 11th Dec.. 1897
PROVISIONAL SPECIFICATION.
An Improved Method and Composition for Making Pneumatic Tyres
Puncture-proof.
(A communication from PHILLIP JOHN WINCH of 19 Hindley Street, Adelaide, .in
the Province of South Australia, Chemist.)
I, ALFRED JULIUS BOULT of 111 Hatton Garden in the county of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to render puncture proof the tyres of bicycles
and other like vehicles without interfering with the resiliency of the tyre.
With the methods at present in use, and more particularly with those in which a
metal shield is introduced between the outer tyre and the pneumatic tube, the
resiliency of the tyre is seriously affected, causing the machine to be perciptibly
slower.
The object of this invention is accomplished by coating the inner surface of
the outer cover or tyre with a special composition, which is afterwards hardened
by a special agent. This composition though hard enough to resist puncture is
still in itself sufficiently elastic not to interfere with the resiliency of the tyre.
The composition is made by dissolving Gelatine, Glue Isinglass or other similar
material in water at a suitable temperature and incorporating with the solution so
obtained Glycerine or other suitable softening agent and a suitable oxide such as Zine
or Lead oxide for giving the necessary consistency to the mass. This composition
whilst in a liquid state is painted upon the outer cover or tyre and is then
treated with a solution of Formic Aldehyde, either by painting such solution
upon it or by exposing it to the gas of the same. The effect of the Formic Alde-
hyde is to make the composition insoluble in water and generally to harden and
toughen it so that it becomes puncture proof. The tyre is then ready for use and
requires no further treatment.
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BOULT & WADE,
Agents for the Applicant.
An Improved Method and Composition for Making Pneumatic Tyres
Puncture-proof.
(A communication from PHILIP JOHN WINCH of 19 Hindley Street, Adelaide, in
the Province of South Australia, Chemist.)
I, ALFRED JULIUS BOULT of 111 Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, 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:-
The obiect of this invention is to rendor nuusture proof the uni

page_text: of bicycles and other like vehicles without interfering with the resiliency of the
tyre.
With the methods at present in use, and more particularly with those in which a
metal shield is introduced between the outer tyre and the pneumatic tube, the
resiliency of the tyre is seriously affected, causing the machine to be perceptibly
slower.
The object of this invention is accomplished by coating the inner surface of
the outer cover or tyre with a composition which is afterwards hardened by a
special agent. The coating thus obtained though hard enough to resist puncture
is still sufficiently elastic not to interfere with the resiliency of the tyre.
The composition is made by dissolving Gelatine, Glue, Isinglass or other similar
material in water at a suitable temperature and incorporating with the solution so
obtained Glycerine or other suitable softening agent and a suitable oxide such as Zinc.
or Lead oxide for giving additional consistency to the mass. This composition
whilst in a liquid state is applied upon the outer cover or tyre and is then treated
with a solution of Formic Aldehyde, either by painting such solution upon it or
by exposing it to the gas or fumes of the same, or the tyre may be treated with
Formic Aldehyde, the composition then applied and its inner surface again treated
"with the Formic Aldehyde. The effect of the Formic Aldehyde is to make the
composition insoluble in water and generally to render it additionally hard and
tough.
The gelatinous composition is obtained by dissolving by means of a water bath
at a gentle heat, about Soz of Gelatine, Glue or other suitable Gelatinous material
in about an equal weight of water. To the solution so obtained is added about 1 dr.
of Glycerine and about 1 dr. of Zinc or other suitable oxide. The mass is well
mixed and is then ready for use. If allowed to cool it must first be warmed
before applied. My correspondent finds that the above formula well answers the
purpose, but he does not bind himself to the exact proportions indicated.
greater consistency may be given to the composition by increasing the proportion
of oxide, or it may be made softer by increasing the Glycerine.
A
In order to harden the composition and render it insoluble, it is after applica-
tion to the tyre, treated by painting or otherwise with about a 40% solution of
the Formic Aldehyde. This is found to be a suitable strength but my corre-
spondent does not bind himself to the exact strength.
Though described as applied more particularly to the inner surface of the
outer cover of detachable tyres, it will be readily perceived that this improved
composition is applicable also to single-tube, tubeless or other forms of tyres
which it is desired to render puncture proof.
Having now particularly described and ascertained the nature of this said
invention as communicated to me by my foreign correspondent and in what
manner the same is to be performed, I declare that what I claim is:-
1. The herein described method of rendering pncuniatic tyres puncture proof,
consisting essentially in the application to the inner surface of the cover or tyre
of a gelatinous composition substantially as herein described and subsequently
hardening or rendering the same insoluble by the application of Formic Aldehyde.
2. The herein described composition for the purposes indicated, consisting of
Gelatine, Glue or other suitable gelatinous substance dissolved in water with the
addition of Glycerine and a suitable oxide in about the proportions indicated,
subsequently subjecting the same to the action of Formic Aldehyde, substantially
as herein described.
Dated this 8th day of Sen 1897
BOULT & WADE,
Agents for the Applicant.