Improvements in or relating to Pneumatic Tyres.
Year: 1893

page_text: cation, 2nd June, 1893
Complete Specification Left, 1st Mar., 1894-Accepted, 7th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in or relating to Pneumatic Tyres.
I, FREDERICK HENRY SPRANG of Deva, St. Julian's Farm Road, West
Norwood, in the County of Surrey, Traveller, do hereby declare the nature of
this invention to be as follows:
This invention relates to the treatment of rubber used in the manufacture
of pneumatic tyres for the purpose of making it automatically close when
punctured.
In carrying the invention into effect I treat the air tube or a portion thereof
with hydrocarbon or similar oils letting the rubber or the portion of it to be treated
absorb or become affected by the oil whereby the volume of the rubber is increased
and that portion being then larger than the rest of the tube or than the containing
envelope or cover is in a state of compression and will promptly close up the
opening when punctured.
The oil may be applied in any convenient manner for example in the case
of a complete tube can be poured inside and left until the rubber is sufficiently
affected by the oil or it may be applied with a brush or the like when the parts are
accessible.
Dated this 2nd day of June 1893.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Pneumatic Tyres.
I, FREDERICK HENRY SPRANG, formerly of Deva, St. Julian's Farm Road,
West Norwood, in the County of Surrey, but now of Heatherbrae, Clarence Road,
Wallington also in the County of Surrey, Traveller, 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 :-
This invention relates to the treatment of rubber used in the manufacture
of pneumatic tyres for the purpose of making it automatically close when
punctured.
In carrying the invention into effect I treat the air tube or a portion thereof
after vulcanization with hydrocarbon or similar oil, letting the rubber or the
portion of it to be treated absorb or become affected by the oil whereby the
volume of the rubber is increased and as that portion if free would then be
larger than the rest of the tube or than the containing envelope or cover it is
Decessarily in a state of compression and will promptly close up the opening when
punctured.
The oil may be applied in any convenient manner; for example in the case of a
complete tube it can be poured inside and left until the rubber is sufficiently
affected by the oil or it may be applied with a brush or the like when the parts
are accessible or the rubber may be left to soak in a bath of the oil.
In practice the vulcanized indiarubber tube is first joined preferably by butting
the ends and covering the joint outside with another piece of tube, the oil is then
poured inside through valve-hole and the tube laid aside for from three to
seven days according to the kind of oil used. At the end of that time the oil

page_text: is squeezed or a. ied out of the tube through the valve-hole and the operation is
complete.
Or the tube may be treated before being joined, either by applying oil with a
brush or by soaking in a bath, and the whole or the top side "crown" only may
be treated.
In single tube tyres the oil is put in through the valve-hole and squeezed or
drained out after treatment.
I am aware of my own previous Patent No. 6041 of 1893 and do not claim here
what is already claimed therein.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what I
claim is ;-
1. Treating rubber to be used in the manufacture of pneumatic tyres with hydro-
carbon or similar oil substantially as and for the purpose described.
2. Treating a pneumatic tyre or the rubber air-tube thereof with hydrocarbon or
similar oil substantially as and for the purpose described.
3. A pneumatic tyre or air-tube therefor treated with hydrocarbon or similar oil
substantially as and for the purpose described.
The thin 10t 1 of March 1904
FRED. H. SPRANG.
W. P. Thompson & Boult,
Agents for the Applicant.
FRED. H. SPRANG.
W. P. Thompson & Boult,
Agents for the Applicant.