Improvements in Pneumatic Tyres for Cycles or other Vehicles.
Year: 1896

page_text: Date of Application, 7th Dec., 1896
Complete Specification Left, 7th Sept., 1897-Accepted, 4th Dec., 1897
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres for Cycles or other Vehicles.
I, JOHN BOOTH of 63 Middle Abbey Street, Dublin, Manufacturers Agent, do
hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in pneumatic tyres for cycles or other
vehicles, and is designed to provide a pneumatic tyre which shall have greater
resilience and resistance to the weight of the rider or superincumbent load, and
which, under pressure, shall present a smaller compressed surface to the road than
in tyres as at present used, whilst at the same time the size and weight of the metal
or other wheel-rim may be reduced.
To carry my invention into effect I superpose two pneumatic tubes or tyres, one
above the other, about the rim of the wheel, such tubes or tyres being of smaller
size than those at present in use, and the outer pneumatic tube may be less than
the inner, so as to build up a composite pyramidal tyre, of great depth and resili-
ence in the plane of the wheel, with narrow apex, and base of less width than that
of the present tyre.
In the present tyre, with a pneumatic tube of large size, the metal rim is of
corresponding large size and weight, and the pressure of the rider or superincum-
bent weight flattens or deforms the tube, so as to cause a large flat surface to lie
upon the road or ground, when compressed by the supercumbent weight, which I
consider disadvantageous, and which I avoid by my arrangement of tyres and by
the small diameter of my outer pneumatic tyre or tube.
The said pneumatic tubes may be attached to the metal rim in any well known
manner, and the cover of the inner tube may have extended wings engaging an
endless wire for attachment of outer tube and cover by the Grappler, Dunlop, or
any known method.
Dated this 7th day of December 1896
FELL & JAMES
1 Queen Victoria Street London E.C. Agents for the Applicant.
Improvements in Pueumatic Tyres for Cycles or other Vehicles.
I, JOHN BOOTH of 63 Middle Abbey Street, Dublin, Manufacturers' Agent 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 improvements in pneumatic tyres for cycles or other

page_text: vehicles, and is designed to provide a pneumatic tyre which shall have greater
resilience and resistance to the weight of the rider or superincumbent load, and
which under pressure shall present a smaller compressed surface to the road, than
in tyres as at prosent used; whilst at the same time the size and weight of the metal
or other wheel-rim may be reduced.
To carry my invention into effect I superpose two pneumatic tubes or tyres, one
above the other about the rim of the wheel; such tubes or tyres being of smaller
size than those at present in use, and the outer pureumatic tube may be less than
the under tube, so as to build up a composite pyramidal tyre of great depth, and
resilience in the plane of the wheel, with narrow apex and base of leas width than
that of the present tyre.,
In the present tyre with pneumatic tube of large size, the metal rim is of
corresponding large size and weight, and the pressure of the rider or superincum-
bent weight Hattens or deforms the tube, so as to cause a large flat surface to lie
upon the road or ground, when compressed by the superincumbent weight, which I
consider disadvantages, and which I avoid by my arrangement of tyres, and by
the small diameter of iny outer pneumatic tyre or tube.
The said pneumatic tubes may be attached to the metal rim in any well known
manner, and the cover of the inner tube may have its ends beaded with an endless
wire or cord for attachment of the outer tube or cover by the "Grappler,"
"Dunlop" or any known method.
And in order that my invention may be the better understood I now proceed to
describe the same with reference to the drawings hereto annexed and to the letters
and figure marked therein.
Figure 1 is a sectional view through my improved tyre.
A is an ordinary cycle wheel rim, and B is the usual tyre cover either with
separate inflatible tube, or combined with such a tube or chamber, the whole being
attached to the rim A in any known method of tube or tubeless tyres.
I insert however in this cover B upon the face or tread of the tyre, about one
inch apart, two hemp cords C or equivalents, so as to form two ridges about the
said ordinary tyre when the latter is inflated.
I now apply to the said first tyre a second cover D, containing a separate inflat-
ible tube E, or having such an inflatible chamber combined with it, and provide
at its edges hemp cords F, bound over by it, in preference to wires, giving greater
flexibility to the second cover and tube D.
If the said second tyre is what is known as "tubeless" a layer of rubber is
required at its edges.
T'he inside diameter of the hemp cords F at the lower edges of the second cover D,
is less than the outside diameter of the ridges C upon the lower cover B when
inflated.
Having partially inflated the lower tyre B, I place the edges of the second
cover D between the ridges C of the first cover B.
I now partially inflate the second tyre D, so that its edges F, being distended
lie close to and within the ridges C.
I now inflate the lower tyre B until it is hard, and presses very firmly upon the
rims or edges F of the second tyre D, and I finally inflate the second tyre D, and
my combined pyramidal tyre is ready for use, with the advantages above detailed.
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.
1st. In a pneumatic cycle tyre, the combination with a known detachably
attached pneumatic cycle tyre, of an outer smaller detachably attached pneumatic
tyre, to form a composite pyramidal tyre of great depth and resilience, with narrow
apex and base, substantially as described.
2nd. In a pneumatic cycle tyre, the combination of two parallel ridges worked
in the outer tread of the cover of a known pneumatic tyre, with an exterior tube

page_text: or tubeless pneumatic tyre, adapted by a cord beaded cover, or lateral flanges, to
be detachably attached by inflation between the aforesaid ridges of the lower tyre,
substantially as described.
Dated this 7th day of Sentercher 1897
FELL & JAMES
1 Queen Victoria Street, London, E.C. Agents for the applicant.