An Improved Automatic Rubber Repairing Compound for Application to the Inner Tubes of Pneumatic Rubber Tyres.
Year: 1899

page_text: Date of Application, 6th Sept., 1899-Accepted, 21st Apr., 1900
COMPLETE SPECIFICATION.
An Improved Automatic Rubber Repairing Compound for Application
to the Inner Tubes of Pneumatic Rubber Tyres.
I, JOHN OSTBERG, of No. 10, Balston Street, St. Kilda, in the Colony of Victoria,
Engineer, 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 that class of self acting compounds of a plastic or
viscous nature for application to the inner annular wall of the bladder of pneu-
matic tyres. My improved compound when "so used and applied becomes prac-
tically a permanent thickening of the inner wall of the bladder yielding to the
expansion and contraction of the rubber to which it adheres and so as in no
appreciable degree to destroy or lessen the resiliency of the tyre as a whole,
while acting automatically and instantly in permanently filling the opening,
small or large, caused by rupture, puncture, or like injury without the loss of
any appreciable quantity of air:
In order that my method of compounding and applying my said improved
compound may be clearly understood, I will first; set forth the ingredients and
relative quantities used to produce one pound weight (sufficient for coating two
bladders) and afterwards set forth the method and means used in converting
the said ingredients into such compound ready for use. I will then fully and
clearly describe my manual or hand method of coating the same on the inner
surface or wall of the bladder, though no doubt this will in the future be done
more suitably and rapidly by some mechanical means or apparatus.
My composition consists of the following ingredients combined in the pro-
portions stated, namely:
Pure rubber or rubber cuttings
Resin white
Boiled linseed oil
Dextrose
-
13 ounces,
1 ounce.
ounce.
of an ounce.
I will now describe the method of compounding the above ingredients;-
Take thirteen ounces of pure scrap rubber, rubber cuttings, or the like, place
it in a suitable utensil, and submit it to heat over a fire until it has dissolved
into a thick mass, (taking care to stir the whole briskly and constantly) but
no longer, or it will become too fluid, then remove it from the fire, take its
temperature which will be 280 degrees, Fah., or thereabouts, and set it aside to
cool till its heat has fallen 20 degrees, Fah., below the temperature last taken,
then add one ounce and a quarter of white resin and stir until thoroughly mixed,
then add one ounce of boiled linseed oil and three fourths of an ounce of dext-
rose; (the two last named ingredients may go in together), well mix the whole,
and stand it aside fill its tamnavutuna 111

page_text: My manual method and means of applying the compound to an ordinary
bicycle bladder may be briefly stated as follows:-
I disjoint the bladder where the ends meet and spread it out on a level surface
in a straight line, and turn it inside out. I then stretch the same to its full
length firmly and smoothly on a hollow mandril consisting of a length of iron
pipe or the like, and carefully remove any sulphur from its surface. I then coat
the outer surface (for the time being) with the composition in such quantity
that when compressed as hereinafter described it will measure from an eighth
to a sixteenth of an inch, according to the class or size of such bladder, and
work it vigorously with the palms of my hands until I have got it as level and
dense as possible by that means. I then take the mandril up and placing it
on a hard level surface, roll or revolve it backwards and forwards thereon rapidly,
and with a hard but even pressure of the hands until it has finally adhered, in
a dense or impact body, to the surface of the bladder, I then dust or dredge the
surface of the composition liberally with fine French chalk, to prevent the com-
pound sticking when the pressure brings the compound face to face, then remove
the bladder from the mandril, re-turn it back to its original position, (the
coating of compound being then inside) and re-connect and secure the two ends
of such bladder together, mount and inflate it in the ordinary way, and the
machine may be taken into immediate work, but it is preferable to hang the
bladder so coated for from two to three days in a moderate temperature before
using it.
For application to a single tube tyre the compound would require to be coated
thereon when tube is being manufactured.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what
I claim is-
The composition consisting of the ingredients in the relative quantities, and
compounded and applied as hereinbefore set forth as an automatic puncture fill-
ing and hermetically sealing substance when coated on the inside of the bladders
of pneumatic rubber tyres.
Dated this 6th day of September 1899.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.