Improvement in Elastic Tyres for Cycle Wheels.
Year: 1894

page_text: ate of Application, 17th Mar., 1894-Accepted, 28th Apr., 1894
COMPLETE SPECIFICATION.
Improvement in Elastic Tyres for Cycle Wheels.
I, ANNA ROTHGIESSER, of Herderstrasse 73, Düsseldorf, in the German Empire,.
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 :-
This invention relates more particularly to the cover, sheathing or lining of
pneumatic tyres, which is generally made of canvas or other woven fabric.
In order that the tyre may possess the greatest possible elasticity, those parts of
the sheath which consecutively touch the ground when in use, and are circum-
ferentially situated one behind the other, should be independent of each other as
far as possible, in order to yield to any projections or inequality of the ground,
over which the tyre may pass.
This is not the case with ordinary canvas covering, which always tend to form a
flat or even surface.
In order to attain the said object, I employ a woven fabric, the longitudinal.
threads of which are comparatively too long, so as to form wave lines, while the-
transverse threads are stretched out tight, and apply it to the tyre in such a manner
that the loose threads are concentric to the circumference of the wheel, while the
taut threads are situated transversely to the said circumference, and therefore
approximately in planes radial to the wheel or transverse to the air tube. When.
the wheels travel over small stones or similar obstacles lying on the road, the
longitudinal threads which are near the said obstacle and which had previously
been loose, are somewhat drawn out without being subjected to excessive tension or
stretching. Thus, while the cross threads are always tight, the longitudinal
threads only prevent the cross threads from moving apart beyond an allowable
limit.
The fabric may be modified by omitting the longitudinal threads along the tread
or outer circumference of the tyre leaving only the cross' threads which are kept
taut by internal pressure, and in both cases the canvas or other woven fabric is or
may be coated with indiarubber in the usual manner.
In the accompanying drawing
Fig. 1 is a perspective view of a woven fabric embodying my invention,.
a indicating the cross threads and 6 the longitudinal threads.
Fig. 2 is a diagram of the modification in which the tread or outer circumference
is without longitudinal threads.
In this case the cross threads may be fastened at the sides of the tyre either by
forming part of a web which covers or lines the inner circumference of the tyre
(that is the part opposite to the tread), or by being tied or hooked on to the edges
of such a web or stiff covering.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A woven sheathing or lining for pneumatic (or other highly elastic) tyres, in.
which the cross threads lying approximately at right angles to the circumference
of the wheel are stretched or taut, while the longitudinal threads or the threads
situated approximately parallel to the circumference of the wheel are loose so as to
form wave lines, substantially as described and for the purpose specified.
2. A filamentary sheathing or lining for pneumatic (or other highly elastic) tyres,
consisting of cross threads placed approximately at right angles to the circumference -

page_text: of the wheel and kept taut on the tread side by the internal pressure, said cross-
threads being not connected with any longitudinal threads along the tread, but
only fastened at the sides of the tyre, substantially as described and for the purpose.
specified.
Dated this 17th day of March 1804
FAIRFAX & WETTER,
433, Strand, London, Agents..