Improvements in or applicable to Pneumatic Tyres and Rims for the Wheels of Cycles and other Vehicles.
Year: 1897

page_text: Date of Application, 25th May, 1897
Complete Specification Left, 20th Nov., 1897-Accepted, 8th Jan.,
1898
Improvements in or applicable to Pneumatic Tyres and Rims for the
Wheels of Cycles and other Vehicles.
I, GILBERT ROY, of 17 Whitelow Road, Chorlton-cum-Hardy, near Manchester,
in the County of Lancaster, Oil Refiner, do hereby declare the nature of this
invention to be as follows:-
My improvements in the construction of pneumatic tyres are designed first to
preserve the tyre from puncture, and secondly in the event of a puncture taking
place to have the tyre still available for use without the loss of any very large
amount of air, and the improvements in the rims of the wheels are designed for
the purpose of facilitating the application and fixing of the tyre to the wheel.
In carrying out my invention I make a single tube tyre of a combination of
india rubber and canvas or other suitable material with a thickened tread having
raised circumferential ridges all round.
The outer part of this tyre is enclosed by a second tread similarly formed, but
not a complete tube, say, about three quarters of a circle in cross section of a
larger diameter than the inner tyre and joined to the latter air-tight all along its
edges so as to form an outer envelope or second tread leaving a space between the
two of a crescent shaped section.
The main tube will be fitted with an inflating valve in the usual manner, and
the space between the two treads will also be fitted with a separate inflating valve
the tube of which will pass through the main pneumatic tube and should be made
of india rubber or other elastic substance so as not to interfere with the resiliency
of the main pneumatic tube.
When the main pneumatic tube and the space between the two treads have both
been inflated the wheel will run on the outer tread which will maintain all the
pressure, but if the outer tread should become punctured the air between the two
treads only will escape, the outer tread becoming soft, but the inner tread being
fully inflated will carry the weight of the vehicle and rider on the raised circum-
ferential ridges before mentioned.
It is not anticipated that a double puncture of both treads will ever occur but
to still further guard against such a possibility I prefer to line each tread, that is
both the main tube and the outer cover with a broad strip of gutta percha or other
puncture proof material.
These improved tyres I propose to make of such a diameter that they will just
fit tight onto the rim without any need for straining, and, to enable the tyre to
be mounted on the rim and readily removed therefrom, I make the metal rim in
two halves, each half consisting of a flat hoop with a raised and curved flange
round one side or edge thereof. These flat hoops or rings are made of such a
circumference that one will fit closely outside the other, and one having its curved
flange on the left hand edge and the other its flange on the right hand edge, it
follows, that when the two rings are fitted together one onto the other their

page_text: combined transverse secion will be that of a trough with a flat or nearly flat base
and two raised curved flanges, one on each side.
The pneumatic tyre either in its inflated or uninflated state is slipped onto the
larger rim which is then slipped over the smaller one, and the two being then
firmly connected together by catches, bolts, screws, or similar devices the
pneumatic tyre will be held firmly in position and can readily be removed as
occasion may require.
I may here remark that although the improved pneumatic tyre and rim here-
inbefore described are specially designed to be used in combination, they can also
be used with advantage separately, and especially that the above described duplex
rim could-be adapted to any of the ordinary pneumatic tyre covers with wired or
other inextendible edges, the tyres being made to fit the rims and having no
necessity for straining over the raised edges of the rims as hitherto practised.
Dated this 24th day of May 1897-
Improvements in or applicable to Pneumatic Tyres and Rims for the
Wheels of Cycles and other Vehicles.
I, GILBERT Roy, of 17 Whitelow Road, Chorlton-cum-Hardy, near Manchester,
in the County of Lancaster, Oil Refiner, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
My improvements in the construction of pneumatic tyres are designed first to
preserve the tyre from puncture, and secondly in the event of a puncture taking
place to have the tyre still available for use without the loss of any very large
amount of air, and the improvements in the rims of the wheels are designed for
the purpose of facilitating the application and fixing of the tyre to the wheel.
In carrying out my invention I make a single tube tyre a (see Figs. 1 and 2 of
the annexed drawings) of a combination of india rubber and canvas or other
suitable material with a thickened tread having raised circumferential ridges a¹
all round.
The outer part of this tyre is enclosed by a second tread 6 similarly formed,
but not a complete tube, say, about three quarters of a circle in cross section of a
larger diameter than the inner tyre a and joined to the latter air-tight all along a
its edges so as to form an outer envelope or second tread leaving a space c between
the two of a crescent shaped section.
The main tube will be fitted with an inflating valve (not shewn) in the usual'
manner, and the space c between the two treads will also be fitted with a separate
inflating valve d the tube c¹ of which will pass through the main pneumatic tube a
and should be made of india rubber, or other clastic or flexible substance so as not
to interfere with the resiliency of the main pneumatic tube a.
. +
-1" +
When the main pneumatic tube a and the space between the two treads have
both been inflated the wheel will run on the outer tread b which will maintain all
the pressure, but if the outer tread should become punctured the air between the 4
two treads only will escape, the outer tread becoming soft, but the inner tread
being fully inflated will carry the weight of the vehicle and, rider on the raised
circumferential ridges above mentioned.
It is not anticipated that a double puncture of both treads will ever occur..but
to still further guard against such a possibility I prefer to line each tread, that is 5

page_text: both the main tube and the outer cover with a broad strip of gutta percha or other
puncture proof material, as seen at f and f¹ Fig. 1.
These improved tyres I propose to make of such a diameter that they will just
fit tight onto the rim without any need for straining, and, to enable the tyre to be
mounted on the rim and readily removed therefrom, I make the metal rim in
two halves, g, h, as seen at Figs. 2 and 3, each half consisting of a flat hoop 9 or h
with a raised and curved flange g or h¹ round one side or edge thereof. These
flat hoops or rings are made of such a circumference that one (g) will fit closely
outside the other (h) and one having its curved flange on the left hand edge and
the other its flange on the right hand edge, it follows, that when the two
rings and are fitted together one onto the other their combined transverse
section will be that of a trough with a flat or nearly flat base and two raised
curved flanges, one on each side, as shewn on Figs. 2 and 3.
The inner rim h is suitably notched to clear the valve or valves projecting from
and fitted to the tyre and the outer rim.
The pneumatic tyre either in its inflated or uninflated state is slipped onto the
larger rim 9 which is then slipped over the smaller one h, and the two being then
firmly connected together by catches k, bolts, screws, or similar devices the
pneumatic tyre will be held firmly in position and can readily be removed as
occasion may require.
I may here remark that although the improved pneumatic tyre and rim here-
inbefore described are specially designed to be used in combination, they can also
be used with advantage separately, and especially that the above described duplex
rim could be adapted to any of the ordinary pneumatic tyre covers with wired or
other inextendible edges, the tyres being made to fit the rims and having no
necessity for straining over the raised edges of the rims as hitherto practised.
I would also remark that the second tread above described forming the inflatable
protective air space can be applied to the treads of other forms of tyre such as a
split tyre without inner tube or a tyre with a tread or cover enclosing an inner
tube, but in the latter case the elastic or flexible tube by which the protective air
space is inflated would pass around one side of and not through the main
pneumatic tube of the tyre.
Also the raised circumferential ridges a¹ may be dispensed with.
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:-
1. A tread for pneumatic tyres provided with a protecting outer tread, forming
an air space to be inflated as well as the tyre, substantially as hereinbefore
described and illustrated by the drawings annexed.
2. A rim for pneumatic tyres made in two parts, each provided with one flange,
and one part sliding over and locked to the other, substantially as hereinbefore
described and illustrated by the drawings annexed.
Dated this 19th Day of Narambar 1907
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:-
1. A tread for pneumatic tyres provided with a protecting outer tread, forming
an air space to be inflated as well as the tyre, substantially as hereinbefore
described and illustrated by the drawings annexed.
2. A rim for pneumatic tyres made in two parts, each provided with one flange,
and one part sliding over and locked to the other, substantially as herein before
described and illustrated by the drawings annexed.
Dated this 19th Day of Naramber 1907
GEO. DAVIES & SON,
Agents for the Applicant, 4, St. Ann's Square, Manchester.