Improvements in Pneumatic Tyres.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres.
I, MALCOLM STODART, of 35 Tyrwhitt Road, Brockley the County of Kent,
Gentleman, do hereby declare the nature of this invention to be as follows:-
My invention relates to pneumatic tyres and has for its object the prevention
of the deflation of the tube containing the air in the event of the said tube being
punctured.
My invention consists in the formation of the air tube in such a way that when
deflated the particles of the rubber are in a state of rest but that when inflated and
enclosed within a restraining envelope, the material of the tube is under
compression.
By this means the air is prevented from escaping when the tube is punctured
because the compressive condition of the tyre tends to force the material against
the sides of the puncturing instrument and upon the withdrawal of the latter to
close the hole made in such a way as to prevent the escape of ais.
To carry my invention into effect I form the tube with a number of corruga-
tions either parallel or oblique with or normal to the axis of the tube and I make
the tube of such normal diameter and shape when not stressed by internal pressure
to any appreciable extent that on inflation within a restraining envelope the
corrugations will be pressed out against the restraining medium with the result
that the particles of the tube will be put under compression.
Dated this 1st day of August 1896.
FELL & JAMES,
Agents for the Applicant.
I, MALCOLM STODART, of 35 Tyrwhitt Road, Brockley, in the County of Kent,
Gentleman, 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 pneumatic tyres and has for its object the prevention
of the deflation of the tube containing the air, in the event of the said tube being
punctured.
My invention consists in the formation of the air tube in such a way that when
deflated the particles of the rubber are in a state of rest but that when inflated and
[Price 8d.]

page_text: enclosed within a restraining envelope, the material of the air tube is in a state
compression.
By this means the air is prevented from escaping when the tube is punctured
by reason of the compressed condition of the tyre which tends to force the
material against the sides of the puncturing instrument and upon the withdrawal
of the latter to close the hole made in such a way as to prevent the escape of air.
To carry my invention into effect I form the tube of a corrugated transverse
section and I make the tube of such normal diameter and shape when not
stressed by internal pressure to any appreciable extent, that on inflation within a
restraining envelope the corrugations will be pressed out against the restraining
medium, with the result that the particles of the tube will be put under compression.
In order that my invention may be the better understood I will now proceed
to describe the same in relation to the drawing hereunto annexed reference being
had to the letters and figures marked thereon.
Like letters refer to like parts in the various figures.
Fig. 1 is a cross section of a tyre with my air tube in its deflated condition.
Fig. 2 is a similar view after inflation.
Fig. 3 is a side elevation of a wheel, a small portion of the outer envelope being
removed to show the inner tube in its deflated condition.
The outer envelope A and fenoe B of the wheel C encloses the improved inner
tube D, which is formed with a corrugated wall as shown in Fig. 1, the length of
the corrugated circumference may be represented in length by 4 while in its
inflated condition as shown in Fig. 2 it is represented by 3 thus 4 parts have been
compressed into the space of 3 parts, so that the particles of rubber forming the
air tube tend to press against one another, and on the tube being punctured, it
holds the puncturing instrument tightly and when such is withdrawn it follows
up the space vacated by, the said instrument and closes up the hole so made and
thus prevents the escape of the air.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what I
claim is:
1st. In a pneumatic tyre the combination of an air tube of corrugated section
with a restraining envelope, arranged so that when the air tube is inflated by
internal pressure the corrugations are pressed out, thereby putting the materia
of the air tube in a state of compression, substantially as described.
2nd. The arrangement and construction of a pneumatic tyre substantially a
described and illustrated in and by the accompanying drawings.
1000
FELL & JAMES,
1 Queen Victoria Street, London, E.C., Agents for the Applicant.