Improvements in and in relation to Pneumatic Tyres for Wheels.. of Cycles and other Vehicles.
Year: 1896

page_text: Date of Application, 10th July, 1896
Complete Specification Left, 10th Apr., 1897-Accepted, 22nd May, 1897
Improvements in and in relation to Pneumatic Tyres for Wheels..
of Cycles and other Vehicles.
I, JAMES ANDREWS ABBOTT of 23 Merchants Quay, Dublin, Ireland, Manufacturer;.
do hereby declare the nature of this invention to be as follows:-
This invention has reference to improvements in, and in relation to pneumatic tyres...
for wheels of cycles and other vehicles and is especially designed to produce greater.
resiliency than is obtainable by these tyres as at present constructed.
In carrying out my invention, instead of dealing with one air tube I propose to
arrange two air tubes around the rim of the wheel, both tubes being in the same
vertical plane and both secured to the rim by one complete cover of canvas or other
suitable material. Or the inner tube may be secured independently and the outer tube
subsequently secured around the inner, by separate covers it being understood that
the said separate covers or one complete cover may be attached to the rim by any of
the well known methods at present employed for the purpose of securing tyres
to rims.
In my invention the inner air tube may be inflated in the ordinary manner, and the
outer tube may be inflated by a valve, the neck of which may be curved round the
shell of the inner tube.
By the arrangement thus described of placing one tube around the other a deeper,
or more elongated air cushion is produced, thus securing an easier and more resilient
rolling surface than is possible in the case of one tube, while the arrangement
also permits of tubes of smaller sectional capacity being used with advantage.
Dated this 9th day of July 1896.
J. K. FAHIE & SON,
9 Westland Row, Dublin, Agents for Applicant.
Improvements in and in relation to Pneumatic Tyres for Wheels
of Cycles and other Vehicles.
I, JAMES ANDREWS ABBOTT of 23 Merchants Quay, Dublin, Ireland, Manufacturer,.
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 has reference to improvements in, and in relation to pneumatic
tyres for wheels of cycles and other vehicles and is especially designed to produce
greater resiliency than is obtainable by these tyres as at present constructed.
In carrying out my invention, instead of dealing with one air tube I propose to
arrange two air tubes around the rim of the wheel both tubes being in the same vertical

page_text: plane and both secured to the rim by one complete cover of canvas or other suitable
material. Or the inner tube may be secured independently and the outer tube
subsequently secured around the inner, in separate covers, it being understood that
the said separate covers, or one complete cover may be attached to the rim by any of
the well known methods at present employed for the purpose of securing tyres
to rims.
In my invention the inner air tube may be inflated in the ordinary manner, and the
outer tube may be inflated by a valve the neck of which may be curved round the
shell of the inner tube.
The accompanying drawings will enable my said invention to be more readily
understood and carried into practice.
Fig. 1. illustrates in section the arrangement of the two tubes A and B, the inner
one B enclosed in a cover C, and both tubes in a cover D; the two covers being
respectively secured in the rim of the wheel by any of the well known methods at
present in use.
Fig. 2. illustrates the arrangement of the two tubes shewing the inner one B
enclosed in a cover C, and the outer one enclosed in an independent cover D',
which is attached to the cover C¹ by solution, sewing or otherwise as may be found
convenient.
The method of inflating the inner tube is well understood, while the outer tube
may be inflated by a flexible valve E, arranged as may be found most convenient in
practice.
By the arrangement of tubes herein described means are provided whereby the
outer tube, which constitutes the rolling surface of the wheel may be softer
than the rolling surface presented by the ordinary type of pneumatic tyre at present
in use.
This advantage will be obvious to cyclists who have experienced that the greatest
freedom from vibration is obtained when the tyre is lightly inflated, and therefore soft.
But in this condition the tyre is more liable to puncture, and is more subject to other
injury such as pinching against the flanges of the steel rim.
The object of this invention is to have the inner tube inflated to the usual extent of
hardness and to inflate the outer tube to such a condition that it will be softer than
the inner tube and thus attain the end in view.-namely, a soft and easy rolling
surface which will be free from the defects attending the present one tube tyre.
To further secure the intention of my invention I propose that the cover enclosing
the inner tube should be of a non stretching material in order to assist in constituting
this tube a strongly inflated tube.
It is also obvious that by my invention a deeper or more elongated air cushion is
produced than is possible in the case of one tube, while the arrangement also permits
of tubes of smaller sectional capacity being used with advantage.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In pneumatic tyres for cycles and other vehicles the arrangement of two tubes one
outside the other in the same vertical plane and enclosed in one cover or in separate
covers in the manner substantially as herein specified and illustrated in the
accompanying drawings.
كيم
11907