Improvements in Pneumatic Tyres for Cycle and other Wheels.
Year: 1893

page_text: Date of Application, 14th July, 1893
Complete Specification Left, 12th May, 1894-Accepted, 14th Aug., 1894
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres for Cycle and other Wheels.
We, ALFRED CECIL WRIGHT and JAMES LESLIE WRIGHT, of 260 Bradford
Street, and WILLIAM BUSH, of Dymoke Street, all in the City of Birmingham,
Manufacturers, do hereby declare the nature of this invention to be as follows:-
Our invention relates to pneumatic tyres for cycle and other wheels and its object
is to obtain all the advantages of the pneumatic tyre while entirely overcoming the
liability to puncturing.
Our invention consists in arranging a tyre with an inner and an outer metallic
rim which rims are independent of each other, the inner rim being fastened as usual
to the spokes and the outer rim being connected to the inner rim by an intervening
pneumatic tyre. The outer metallic rim entirely covers and protects the pneumatic
tube and it compresses the whole of the tube so that the effect of the pneumatic
cushion is to keep the outer and inner rims slightly out of centre when the weight
of the rider is on the machine.
We
In carrying our invention into effect according to one method we construct an
inner rim of any usual kind, concave surface outwards as is usual, and an outer
rim, concave surface inwards, and we make the diameter of the outer rim large
enough to allow a considerable free space between the two. Into this space we
insert a pneumatic tube which when distended holds the two rims concentric.
cover the whole combination with canvas or cloth so that the tyre presents the
usual appearance of a pneumatic tyre. The action, however, is slightly different
as the yield or cushioning occurs between the outer and inner metallic tyres, that
is, as the wheel runs the pneumatic tube is compressed by the outer metallic tyre
which in itself forms a strong wheel and runs on the roadway divided from it only
by the canvas covering. The pneumatic tube may be arranged in various ways
between the two metallic tyres which are preferably constructed of steel, and the two
metallic tyres may be arranged to overlap and entirely enclose the tube or not as
desired.
The invention may be modified in several ways but an essential feature con-
sists in the arrangement in combination of an inner metallic tyre with an outer
tyre connected together by a pneumatic tube interposed between them.
The configuration of the outer and inner metallic tyre section is so arranged
that the pneumatic tube has room or freedom to alter its form under the compression
due to the weight of the rider and machine.
Various modes of wrapping with canvas may be adopted, and the pneumatic
tube may be wrapped with canvas to interpose between the rubber and the metal
if desired.
The wire system of fastening the pneumatic tyre may be adopted.
We do not limit the application of our invention to any particular form of wheel,
but we modify the shape and arrangement of the two tyres with the interposed
pneumatic tube to suit perambulators, invalid chairs, cabs and other vehicles.
Dated this 13th day of July 1893
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicants.

page_text: improvements in Pneumatic Tyres for Cycle and other Wheels.
We, ALFRED CECIL WRIGHT and JAMES LESLIE WRIGHT, of 260 Bradford
Street, and WILLIAM BUSH, of Dymoke Street, all in the City of Birmingham,
Manufacturers, 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 :-
Our invention relates to pneumatic tyres for cycle and other wheels and its object
is to obtain all the advantages of the pneumatic tyre while completely overcoming
the liability to puncturing.
Our invention consists in arranging a tyre with an inner and an outer metallic
rim which rims are independent of each other, the inner rim being fastened as
usual to the spokes and the outer rim being connected to the inner rim by an
intervening pneumatic tyre. The outer metallic rim, covers and protects the
pneumatic tube and
compresses the whole of the tube so that the effect of the
pneumatic tube is to keep the outer and inner rims slightly out of centre when
the weight of the rider is on the machine.
Referring to the accompanying sheet of drawings ;-
Figures 1 and 2 are respectively side and edge elevations of a wheel constructed
in accordance with our invention.
Figure 3 is a section showing the pneumatic tube between the inner and
outer rims.
Figure 4 is a section of a suitable tube with canvas flaps for attachment.
Figure 5 is a section illustrating a modified construction of outer metallic
rims.
Figure 6 is a plan and Figure 7 a cross section of a rubber tread to be placed
outside our external metal rim.
Figure 8 is an elevation and Figure 9 a section of a part of a cab or carriage
wheel constructed in accord with our invention.
In carrying our invention into effect according to one method we construct an
inner rim such as B Figures 1, 3 and 5 of any usual kind, concave surface outwards
as is usual, and an outer rim A concave surface inwards and we make the diameter
of the outer rim large enough to allow a considerable free space between the two.
Into this space we insert a pneumatic tube C which when distended holds the two
rims A and B concentric. We may cover the whole combination with canvas or
cloth so that the tyre presents the usual appearance of a pneumatic tyre. The
action, however, is slightly different as the yield or cushioning occurs between the
outer and inner metallic tyres A and B, that is, as the wheel runs the pneumatic
tyre C is compressed by the outer metallic tyre A which in itself forms a strong
wheel and runs on the roadway divided from it only by the canvas or rubber
covering D.
The pneumatic tube C may be arranged in various ways between the two metallic
tyres A and B which are preferably constructed of steel, and the two metallic
tyres may be arranged to over-lap and entirely enclose the tube or not as
desired.
The invention may be modified in several ways but an essential feature consists
in the arrangement in combination of an inner metallic tyre as B with an outer
tyre A connected together by a pneumatic tube C interposed between them.
The configuration of the outer and inner metallic tyre section is so arranged
that the pneumatic tube has room or freedom to alter its form under the compression
due to the weight of the rider and machine.

page_text: Various modes of wrapping with canvas may be adopted, and the pneumatic
tube may be wrapped with canvas to interpose between the rubber and metal if
desired.
The pneumatic tube may for example be attached to the metallic rims A and B
by means of canvas flaps such as C C C and C+ Figure 4. These flaps are folded
over the said rims B and C as shown in Figure 3 and cemented or otherwise
attached together in any convenient manner.
The rubber tread D Figures 3, 5, 6 and 7 may also be attached outside the
canvas by solution or cement. In Figure 5 we show another form of outside
metallic rim A which is constructed to lie close to the pneumatic tube and so cause
the finished tyre to present the usual appearance of a pneumatic tyre.
The pneumatic tube C may be so arranged that the pressure of inflation secures
it between the outside and inner rims, by lugs, flanges, projections or other well
known devices for attaching pneumatic tubes to tyres by inflation.
Figures 1 and 2 clearly show the general appearance of a cycle wheel constructed
in accordance with our invention.
Figures 8 and 9 show part of a cab or carriage wheel constructed in accordance
with our invention and with the outer metallic rim A for contact with the roadway,
the inner rim B and the pneumatic tube attached by canvas or in any other
convenient way between the two rims.
We use the ordinary and well known arrangements for inflating our pneumatic
tubes.
The wire system of fastening the pneumatic tyre may be adopted.
We do not limit the application of our invention to any particular form of wheel,
but we modify the shape and arrangement of the two tyres with the interposed
pneumatic tube to suit perambulators, invalid chairs, cabs and other vehicles.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is ;-
1. A pneumatic tyre for cycle and other wheels in which a pneumatic tube is
interposed between an inner and an outer metallic rim the outer rim being rigid
in construction so as to run as a wheel and not as a flexible band on the roadway
without bending so as to preserve its circular form substantially as hereinbefore
set forth.
2. A pneumatic tyre for cycle and other wheels in which a pneumatic tube is
interposed between an inner and an outer metallic rim, the inner and outer rims
being formed as to secure the pneumatic tube between them when the said tube is
inflated substantially as hereinbefore set forth.
3. The construction and arrangement of pneumatic tyres for cycle and other
wheels substantially as hereinbefore described and illustrated in the drawings.
Dated this with 1
M100.1
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicants.