Improvements in and connected with Inflated Tyres for Velocipedes and similar Road Carriages.
Year: 1891

page_text: Date of Application, 27th Nov., 1891
Complete Specification Left. 9th July, 1892-Accepted, 13th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in and connected with Inflated Tyres for Velocipedes
and similar Road Carriages.
I, EDWARD HENRY SEDDON of Marsland Road, Brooklands in the County of
Chester do hereby declare the nature of this invention to be as follows:-
My invention relates to inflated tyres for velocipedes and similar road carriages
and my improvements consist in the use of elastic cloth manufactured on a warp
knitting frame and made airproof by a coating of pure indiarubber for said tyres
and for air tubes inserted into them and in the combination with said tyres or air
tubes of a second internal air tube made of the same material or of indiarubber.
For making the air tubes and tyres I cut the elastic cloth after it is coated with
indiarubber lengthways into strips narrower than the circumference the inflated
tyre or air chamber is to assume and of a length about equal to the periphery of the
tyre or tube when mounted upon the rim and inflated, and cement the edges and
ends together, so that the annular tube thus formed can be easily passed over the
edges of a concave rim or other rim with projecting edges or sides. When the tyre
or air chamber is inflated, the stretching of the cloth in its circumferential or
transverse direction causes it to be contracted in the longitudinal direction chiefly
on the inner side of the tyre or air chamber so as to fit into and contract upon the
rim. The tyres made in this way are covered on the part projecting beyond the
rim with a harder indiarubber compound more thinly at the sides and thickly on
the tread of the tyre. The tyre may be fixed to the rim by bands or wires passing
through loops cemented to the sides of the same or by other suitable means.
In combination with tyres and air chambers thus manufactured I preferably use
a second internal air tube made either in the same manner or of indiarubber only
and fit a valve to the same which passes airtight through the outer tube or tyre
and through the rim, by means of which valve the inner tube can be inflated.
While the outer tube or tyre is inflated, the inner one lies in a collapsed state
inside the same, but can be inflated when the outer tube or tyre becomes leaky and
collapses and thereby the outer tube or tyre is brought again to its former inflated
size and its use can be continued.
Dated this 26th day of November 1801
R. J. URQUHART,
57, Burton Arcade, Manchester, Consulting Engineer and Patent Agent.
COMPLETE SPECIFICATION.
Improvements in and connected with Inflated Tyres for Velocipedes
and similar Road Carriages.
EDWARD HENRY SEDDON of Marsland Road, Brooklands in the County of
Chester India Rubber Manufacturer, do hereby declare the nature of this
invention and in what manner the same is to be perforined, to be particularly
described and ascertained in and by the following statement:-
My invention relates to inflated tyres (or tires) for velocipedes and similar road
carriages more particularly to such tyres as are described and claimed by me in the
Specification of my prior Patent. No. 6197 A.D. 1891 and consists in an improved
arrangement of the air tubes or chambers of said tyres. Instead of making the
air-chamber of my improved tyre in compartments as described in my said
Specification No. 6197 A.D. 1891, I make, according to my present invention, my
improved tyres by inserting into an outer air tube a second internal air tube each

page_text: fitted with a separate nozzle or throat piece and valve so arranged that each air
tube can be separately inflated independently of the other.
On the sheet of drawings appended hereunto
Fig. 1 shows a cross section of my improved tyre with the inner air tube deflated
and collapsed.
Fig. 2 a cross section with the inner tube inflated.
Fig. 3 a partial longitudinal section with the inner air tube deflated on the left
and inflated on the right.
C
On the drawings Å is the outer envelope of the tyre which may be made and
attached to the rim B in any suitable ordinary manner, for instance by means of
wires a a inserted into the edges of the envelope and coupled at their ends. C is
the outer air tube inserted into the envelope, and D the inner tube inserted into the
outer tube C. To the tube C the nozzle or tube c is cemented to which a back
pressure valve of any suitable kind is attached. The nozzle c may be of india-
rubber and the shank of the valve bound in the same or of metal and the valve
screwed to it. To the tube D a similar tube or nozzle d is cemented, the outer
tube C and inner tube D being cemented together under the flange of the nozzle so
that the latter passes air-tight through the outer tube.
The outer tube D may be made of india-rubber or of canvas coated with india-
rubber, but preferably I make it from a knitted fabric produced on a warp knitting
frame, coated on the inside or on both sides with india-rubber. This fabric is cut
lengthways into strips of such length that when the edges are cemented together
and the tube formed, it can be passed readily over the edge of the rim B. When
this tube is inflated, the lateral expansion or stretching causes it to contract
lengthways particularly on the inner side and place itself smoothly against the
envelope A and contribute to hold said envelope to the rim, while the softness of
this knitted material makes it less liable to puncture than canvas or pure rubber.
The inner tube D may be made in the same manner, but is preferably made of
pure rubber to save weight. It is of course made first and placed into the outer
tube before the edges or ends of the latter are cemented together.
In some cases I may dispense with the outer envelope A and coat the tube Con
the outside with rubber with or without canvas linings or insertions, or cement said
envelope to the tube C.
The tyre will be used at first with the outer tube C inflated and the inner tube D
collapsed as shewn by Fig. 2. When the outer tube becomes punctured and
collapses, the inner tube can be inflated as shewn by Fig. 3, and the use of the
wheel continued. This arrangement of air-tubes is more convenient to manufacture
than the one described in my prior Specification No. 6197 A.D. 1891 and allows
the use of the tyre to be continued when the outer tube becomes injured near to
the rim.
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:-
The manufacture and use of inflated tyres for velocipedes and similar road
carriages having two air-tubes or tubular compartments one inserted inside the
other, each being provided with a separate valve for inflation substantially as
hereinbefore described and for the purpose set forth.
Dated this 8th day of July 1802
R. J. URQUHART,
57, Barton Arcade, Manchester, 5, Clayton Square, Liverpool,
Consulting Engineer and Patent Agent.