Improvements in Pneumatic Tyres.
Year: 1897

page_text: I, FREDERIC WEAVER OLIVER, of 40, King Street, Cheapside; in the City of London;
do hereby declare the nature of this invention to be as follows:-
Numerous attempts have been made to prevent the puncture of the inner
pneumatic tubes of tyres by the use of shields but hitherto these have been so heavy
and rigid as to neutralise to a great extent the advantages of the pneumatic tyre or
where endeavours have been made to avoid this by the use of lighter shields they
have been so rigidly held as to be readily punctured.
02
According to this invention I employ a shield of thin horny but flexible material
secured in place between the outer cover and the inner pneumatic tube without
being fixed to the inside of the tread of the former. If the outer cover be perforated
by a nail or the like the point does not puncture the shield (as it would do if it
were rigidly connected to the cover) but merely makes a small depression in it, the
resistance necessary to prevent puncture being not equal to the whole weight on
the wheel but only equal to the air pressure on the small depression.
The material I employ is a strip of pegamoid canvas having its edges cemented
to the edges of the outer cover but not being otherwise fixed to it.
Improvements in Pneumatic Tyres.
I, FREDERIC WEAVER OLIVER, of 40, King Street, Cheapside, in the City of
London, 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 :-
Numerous attempts have been made to prevent the puncture of the inner
pneumatic tubes of tyres by the use of shields but hitherto these have been so
heavy and rigid as to neutralise to a great extent the advantages of the pneumatic
tyre or where endeavours have been made to avoid this by the use of lighter shields
they have been so rigidly held as to be readily punctured.
According to this invention I employ a shield of thin horny but flexible material
secured in place between the outer cover and the inner pneumatic tube without
being fixed to the inside of the tread of the former. If the outer cover be perforated
by a nail or the like the point does not puncture the shield (as it would do if it were
rigidly connected to the cover) but merely makes a small depression in it, the
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page_text: resistance necessary to prevent puncture being not equal to the whole weight on the
wheel but only equal to the air pressure on the small depression.
The material I employ is a strip of pegamoid canvas having its edges cemented
or sewn to the edges of the outer cover but not being otherwise fixed to it.
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. A pneumatic tyre having between the outer cover and inner pneumatic tube a
shield of thin horny but flexible material which is not fixed to the inside of the tread
of the cover.
2. An outer cover for a pneumatic tyre having fixed to its edges the edges of a strip
of thin horny but flexible material.
3. A pneumatic tyre having between the outer cover and inner pneumatic tube a
shield of pegamoid canvas which is not fixed to the inside of the tread of the cover.
4. An outer cover for a pneumatic tyre having fixed to its edges the edges of a
strip of pegamoid canvas.
5. Pneumatic tyres substantially as described.