Improvements in Elastio Tyres for the wheels of Vehicles.
Year: 1893

page_text: Date of Application, 2nd Feb., 1893-Accepted, 4th Mar., 1898
COMPLETE SPECIFICATION.
Improvements in Elastio Tyres for the wheels of Vehicles.
We, GEORGE HANCOCK, of 165 Silver Spring Street, Providence, Rhode
Island, United States of America, Engraver, and SHEFFIELD SMITH, of
244 North Main Street, Providence, Rhode Island, United States of America,
Physician, 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 :-
The object of this invention is to provide a light, efficient and durable elastic
tyre, which may be employed either as a pneumatic, or a cushion tyre, and it con-
sists in a tyre composed of different layers and qualities, of cork and rubber
composition all vulcanized together, as hereinafter fully set forth.
Fig. 1, represents a side elevation of a vehicle, wheel provided with an elastic
tyre, embodying this improvement.
Fig. 2, reprosents an enlarged transverse section taken through the rim of the
wheel and the tyre, showing the different composition of the layers of which the
tyre is composed.
Fig. 3, represents a similar section, showing a modification in the composition of
the several layers of the tyre.
In the accompanying drawings, A represents the rim of the wheel, and B the
elastic tyre, which when used as a pneumatic tyre, will be provided with a closing
valve, or stopper C, by, means of which the air may be introduced to the cavity D
of the tyre and held therein under the proper degree of pressure. The tyre B is
formed of layers composed of different compounds of cork and rubber, that is to
say, either of layers of rubber and cork mixed in different proportions as represented
in Fig. 3, or of rubber mixed with cork of different degroes of granulation or
fineness, as shown in Fig. 2, and in the said figures ;. a, a, ropresents the finely
divided particles of cork and the rubber which serves to hold the particles of cork
together in the fabric. And in forming this improved tyre, we preferably first
wind a sheet of cork and rubber compound c, of a comparatively fine quality, that
is to say, either composed of a comparatively large proportion of rubber, or composed
of rubber and comparatively fine particles of cork, and over this, we wind strips or
sheets d, of a coarser compound, that is; a compound of which the cork consists in
a greater proportion to the whole, or in larger particles, and over this coarser
compound d, we wind strips or sheets of a finer compound of cork and rubber
e, the
whole being removed from the mandrel, joined end to end in any suitable manner,
and vulcanized together in a mold or otherwise, to form an annular tyre in which
the same materials, consisting of cork and rubber are employed, arranged in layers
having different proportions or qualities of cork in the compound of which the layors
are formed. And in the case of the pneumatic tyre we strengthen the tyre as
usual by means of an included toxtile envelope, which may be applied in any
suitable manner, and at any desirable portion of the cork and rubber wall of the
tire; and by this invention we are enabled to make a light and durable tyre having
a less quantity of rubber than the ordinary rubber tyre, and having its walls of
greater thickness, whereby the tyre is less liable to penetration and injury by sharp
or pointed objects encountered in its track, without a corresponding increase in the
weight of the tyre as when pure rubber is employed for either of the layers of
which the tyre is composed. The finer composition of cork and rubber e, is prefer-
able upon the exterior of the tyre, to provide for a desirable wearing quality and
durability, and the finer composition cat the interior of the tyre, serves to strengthen
the tyre, but may in many cases be omitted, the coarser composition d being made
to continue entirely to the cavity D of the tyre.

page_text: This improved tyre is adapted for use, either as a pneumatio, or a cushion tyre,
and the layers of cork and rubber composition may be made thicker at the tread, or
other desirable portion of the tyre, as indicated by the dotted lines.
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. An elastic tyre for vehicles, formed of differing layers of cork and rubber
composition, all vulcanized together, substantially as described.
2. An elastic tyre for vehicles, formed of difforing layers of cork and rubbor
composition, strengthened and supported by an included textile fabric, substantially
us described.
3. An elastic tyre for vehicles, formed of differing layers of cork and rubber
composition, strengthened and supported by an included textile fabric, and provided
with an inflating valve, substantially as described.
4. An elastic tyre for vehicles, formed with an inner, and an outer layer,
composed of a comparatively fine compound of cork and rubber, and an inter-
mediate coarser compound of the same, all vulcanized together, substantially as
described.
5. An elastic tyre for vehicles, formed with an inner layer composed of a com-
paratively coarse compound of cork and rubber, and an outer wearing layer, of a
finer composition of'cork and rubber, substantially as described.
Dated this Th
1000
GEORGE HANCOCK.
SHEFFIELD SMITH.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicants.