Improvements in the Manufacture of Material for Automatically Closing from Within any Punctures or Fissures made in Pneumatic Тугов.
Year: 1899

page_text: Improvements in the Manufacture of Material for Automatically
Closing from Within any Punctures or Fissures made in Pneumatic
Тугов.
I, ISIDORE HENDRICKX, of 31, Lombard Street, in the City of London, Merchant,
do hereby declare the nature of this invention (a communication from Raoul
Broquet, of Nivelle, Professor and Chemist, and César Dethier, of Genappe,
Chemist, both in the Kingdom of Belgium) to be as follows:
The object of this invention is to provide a material suitable for application in
the interior of a pneumatic tyre for the purpose of automatically closing any
punctures or leaks made in the tyre. A great number of materials have been
invented or compounded having the fundamental principle of a viscous liquid
holding in suspension solid crystalline or gummy particles, but none of them
have so far satisfactorily answered to the exigencies of actual practice.
This invention consists in the production of a liquid which holds in suspension
the solid organic particles that form a paste as soon as the liquid is expelled
through any puncture or leak in the tyre, and thus close or fill the said leak so
that the tyre is able to maintain the air in compression after as well as before
the perforation.
For the purpose of the invention I employ gluten and glycerine the latter being
prepared in a special manner. The glycerine is according to this invention
treated in such manner that it acquires the same density as the gluten, and this
is effected by rendering a certain quantity of dextrine and starch soluble therein
by means of a gentle heat. Or instead of dextrine and starch 1 may use other
materials fulfilling the same object.
The solution having cooled down the gluten is added.
By reason of the two essential parts of the product, the prepared glycerine
and the gluten being of the same density, the product is perfectly homogeneous
throughout, and no sediment is formed; it has no sticky property; moreover it
is found to preserve the elasticity of the rubber and thus render it more durable.
The liquid is introduced into the air chamber of 'the tyre by injection or otherwise
by way of the valve.

page_text: Improvements in the Manufacture of Material for Automatically
Closing from Within any Púnctures or Fissures made in Pneumatic
Tyres.
I, ISIDORE HENDRICKX, of 31, Lombard Street, in the City of London, Morehant,
do hereby declare the nature of this invention (a communication to me from
abroad by Raoul Broquet, of Nivelle, Professor and Chemist, and César Dethier,
of Genappe, Chemist, both in the Kingdom of Belgium, and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
The object of this invention is to provide a material suitable for application in
the interior of a pneumatic tyre for the purpose of automatically closing any
punctures or leaks made in the tyre. A great number of materials have been
invented or compounded having the fundamental principle of a more or less
viscous liquid holding in suspension solid crystalline or gummy particles, but none
of them have so far satisfactorily answered to the exigencies of actual practice.
Some such liquids are useless because they are not homogeneous, the conse-
quence being that clouds, clots, or lumps of the thickening matter (be it bran,
or starch or mineral or otlier matter) are formed and irregularly distributed
throughout the mass, and it is quite a chance as to whether such a clot comes
opposite the leak at the right moment so as to be projected into it with great force,
because unless this happens to take place a sensible diminution of pressure will
ensure, before a clot happens to come just opposite the leak, and there will be no
leak stopping action.
Other such liquids are useless because they encrust the interior of the tyre and
clog the valve so as to make it stick.
Other such liquids again have an injurious solvent action on the rubber of the
tyre and are therefore useless,
Again other such liquids will momentarily or vory temporarily, that is to say for
an hour or so, stop a leak and then drop away from the place.
This invention, the outcome of some years patient experimenting with many
different substances and processes of manufacture consists in the production of a
liquid having none of the aforesaid defects but which holds in suspension equally
distributed the solid organic particles that form a paste as soon as the liquid is
expelled through any leak or puncture in the tyre, and thus close or fill the said
leak, so that the tyre is able to maintain the air in compression.
For the purpose of the invention I employ gluten and glycerine, the latter
being treated in a special manner. The glycerine is according to this invention
treated in such a manner that it acquires the same density or specific gravity as
gluten.
This is effected by rendering, a certain quantity of dextrine and starch soluble
therein by means of a gentle heat.
ог
I dissolve for instance 5 grams of dextrine and 20 grams of starch in 100 grams
of glycerine. This is effected by heating the mixture in a
6 bain Marie"
jacketed vessel to about 75° C. (167° F.) When the solution has cooled down it
is mixed with 30 grams of gluten.
By reason of the two essential parts of the product viz. the treated or prepared
glycerine and the gluten being of the same density, the product is perfectly and
permanently homogeneous throughout, and no sediment is formed; it has no
sticky property; morcover it is found to preserve the elasticity of the rubber of
the tyre and thus render it more durable. The liquid is introduced into the tyre

page_text: or air chamber of the tyre by injection or otherwise by way of the valve, which
latter does not become set fast or clogged thereby. The gluten is the active
agent in filling the puncture or leak; the starch increases the density of the
glycerine, and the dextrine slightly increases the viscosity.
Having now particularly described and ascertained the nature of the said
invention (as communicated to me by my foreign correspondents) and in what
manner the same is to be performed, I declare that what I claim is:-
1. A process for making a homogeneous mixture for automatically closing
leaks in pneumatic tyres consisting in treating glycerine in such manner as to
render it of equal density with gluten and mixing the so prepared glycerine with
gluten substantially as and for the purpose set forth.
2. A process for making a homogeneous mixture for automatically closing leaks
in pneumatic tyres consisting in dissolving 5 grams of dextrine and 20 grams of
starch in 100 grams of glycerine by a heat of about 75° C. (167° F.) and when the
solution has cooled adding thereto 30 grams of gluten.
3. A homogeneous mixture for automatically closing leaks in pneumatic tyres,
consisting of gluten and of treated or prepared glycerine, the treatment consisting
in the glycerine having been rendered of the same specific gravity as the gluten.
Dated this Fourth dox of
1000
0
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.