An Improved India Rubber Compound, applicable to the Prevention and Repair of Punctures in Pneumatic Tyres.
Year: 1894

page_text: Date of Application, 27th Aug., 1894
Complete Specification Left, 27th May, 1895-Accepted, 3rd Aug., 1895
An Improved India Rubber Compound, applicable to the Prevention
and Repair of Punctures in Pneumatic Tyres.
THOMAS COPPOCK Junior, Painting Brush Importer, 5, Lancaster Road
Fallowfield, Manchester do hereby declare the nature of this invention to be as
follows:-
In performing my invention, I first dissolve pure para rubber in as much
dissolving liquid such as benzol (preferred) as will bring the rubber to a thin jelly.
I then mix the rubber jelly with three or more times its bulk of elemi resin; after
thoroughly blending which may be done by hand or machine, it is then boiled on a
slow fire until the whiteish colour has disappeared it is then ready for use after
being kneaded for a few minutes.
Or in place of boiling, it may be heated by burning, so :-The rubber & elemi
having been blended (as in the boiling process) it is put on a fine grate sieve & set
on fire, as it burns it drops through the small holes in grate sieve & into a trough
of water that had previously been placed there; the compound is then lifted out
& after being kneaded a little to take the stiffness away, it is ready for use.
The pure para rubber and elemi resin may be simply placed in their proportions
into a jar or suitable vessel & the dissolving liquid added and then allowed to stand
until thoroughly dissolved then shaken or well stirred; then evaporate the solvent
and afterwards boil or burn as previously mentioned.
Colophony may be used in place of elemi when boiling only, so :-Pure para
rubber is placed in pan with three or more parts of colophony, it is then boiled on
a slow fire until the colophony has completely melted into a thin liquid, well
stirring while boiling; it is then cooled and well kneaded until the colour of the
compound is a pale grey, it is then ready for use.
The compound after being prepared in any of the mentioned ways, may then be
put through a roller and rolled into strips or sheets in thicknesses of about three
sixteenths of an inch and then applied all round the tread of the tyre, either
inside an air tube or between an air tube and the outer case or inside a tyre
where the air tube and outer case are one; when it is placed inside the air tube
a thin strip of vulcanised rubber is placed over it and then fixed in a suitable
way to the inside of tyre, this strip keeps the air completely away from the
compound.
The compound can be applied to ball or sectional tyres also.
Dated this 04th Jan of Amund 1904

page_text: COMPLETE SPECIFICATION.
An Improved India Rubber Compound, applicable to the Prevention
and Repair of Punctures in Pneumatic Tyres.
THOMAS COPPOCK Junior, Painting Brush Importer, Goyt Villa, Marple
Bridge, Marple, Derbyshire, 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 :-
In performing my invention I first dissolve four pounds of pure-para rubber in
six gallons of dissolving liquid such as henzol, (preferred), which will when
thoroughly dissolved, be in the form of a pale thin jelly. I then add to the jelly,
twelve gallons of elemi resin or its equivalent in weight; I then mix the jelly aud
elemi quickly together, which is done by hand or machine; after the jelly and
elemi have been thoroughly blended, the mixture is then put into a pan and heat
applied, when the whiteish colour disappears as it is boiling, it is then allowed to
cool, then taken out & well kneaded for a few minutes in a cold water bath either
by hand or machine.
Instead of the boiling process, it may be made. by burning.so: The rubber.jelly
and elemi resin, having been blended as in the boiling process, it is put on.a fine
grate sieve and set on fire, as it burns it drops through the small holes in the
grate sieve and-from thence into a trough of water, that had previously been
placed under; it is then lifted out and kneaded for a few minutes in a cold water
bath.
The rubber & elemi resin, may be simply placed in their proportions into a
vessel and the dissolving liquid added, (a double quantity of dissolving liquid
required in this case) then shook & well stirred at various times until thoroughly
dissolved into a paste; then evaporate the solvent; afterwards boil or burn as
mentioned.
Colophony may be used in place of elemi in the boiling process, so :-
:-Fourteen
pounds of colophony is placed into a pan, heat is then applied; when the colophony
has melted into.a liquid, one.gallon of the rubber jelly is slowly & carefully put in,
stirring quickly until the rubber jelly has thoroughly mixed with the colophony,
allowing it to boil until the froth disappears, when it is allowed.to cool, and then
kneaded by hand or machine, in a cold water bath until it is in colour a pale
grey.
The compound after being prepared in any of the mentioned ways, is then put
through a roller or rollers and rolled into strips or sheets, in thicknesses of about
three sixteenths of an inch, and then applied all round the tread of the tyre, either
inside an air tube or between an air tube and the outer case or inside a.tyre where
the air tube and outer case are one.
A strip of suitable material such as closely woven calico is placed over the
compound and fastened in a suitable manner; this keeps the compound in
position.
The compound may be applied to ball or sectional tyres also.
The compound when cold is slightly hard, and when warm very soft and sticky
also elastic; if it is spft when a puncture occurs (which is nearly always so) it
closes up immediately; but if the compound happens to be cold and slightly
hard, all that is required is a little friction with thumb and finger, which at
once softens it and closes the puncture. For the repairing of tyres where the
compound has not been fitted or applied; simply push into the hole, (with a
piece of blunt wire or such like) a piece of the compound, about the size of a small
marble, allowing half inside and half outside the hole; then place over the outside
half, a piece of brown paper or thin closely-woven calico or such similar material;
it is then air-tight again.

page_text: 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.-
(1.) The rubber and elemi resin, the two blended together as herein described
forming a compound.
(2.) The rubber and colophony, the two blended together as herein described
forming a compound.
(3.) The blending of the elemi resin, with the rubber, forming a compound.
(4.) The blending of the rubber with the colophony forming a compound.
(5.) The actual use of the elemi resin and the colophony, and blended with the
rubber forming a compound.
(6.) Applying the compound to pneumatic tyres and as a preventative against
punctures also as a repairer of punctures.
Dated this Twenty-fifth day of May 1895.
THOMAS COPPOCK, JUNIOR.