Improvements in or relating to Pneumatic Tyres.
Year: 1899

page_text: I, WALLACE HENRY PAULL, of 4, Strensham Road, Birmingham, Manager, do
hereby declare the nature of this invention to be as follows:-
My invention relates to certain improvements in the construction of pneumatic
tyres and more particularly to certain details in the construction of the outer
cover.
According to one- method, I form the outer cover of fabric and rubber and
so arrange the edges thereof that they interlock one with the other. This may
be done in several ways, for instance, by bending back the edges of the cover,
so that they form two continuous hooks which engage one with the other, or
by forming on each edge a bead or cord adapted to interlock the one with the
other, or again by enclosing within the edges of the cover, light bands of metal
or other stiff material, these also being arranged to interlock. In any of these
methods, the simple interlocking of the edges would not of itself be sufficient
to make the tyre secure upon the rim. And to provide a reliable tyre, I so
construct or arrange the fabric of the outer cover that the strain of inflation is
taken primarily by the fabric itself, and it is only when the air pressure within
the tyre approaches a riding pressure that any great radial or outward strain
comes upon the interlocked edges. and there would then be a corresponding down-
ward pressure from within.
The interlocking of the edges merely acts by seating the tyre evenly upon
the rim, and preventing lateral spreading of the edges of the cover, and not
as the means of attaching the tyre to the rim.
To enable the fabric to so withstand the strain of inflation, I arrange the threads
in layers, diagonally and circumferentially. The circumferential threads being
laid on preferably on a former, with raised centre.
Dated this Third day of Mar 1899
.
WALLACE HENRY PAULL.
Improvements in or relating to Pneumatic Tyres.
I, WALLACE HENRY PAULL, of 4, Strensham Road, Birmingham, Manufacturer,
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 has for its object the provision in the construction of a pneumatic

page_text: tyre, or the outer cover of the same, of simple and convenient means for effectually
securing the tyre upon rims of varying sections such as are now generally
employed for cycle wheels.
In order that my invention may be the more readily understood I append
hereunto a sheet of explanatory drawings to be hereinafter referred to.
Figure 1 is a transverse section showing one of my improved tyres in position
on a cycle wheel rim, the inner air tube being omitted.
Figure 2 is a plan of the outer cover of the tyre when straightened out.
I preferably form the outer cover of the tyre from layers of fabric and rubber
and arrange the edges to interlock the one with the other. For the purpose of
such interlocking a strip as A of vulcanised fibre or other material may be sewn
or otherwise secured along or near each side or edge of the cover, so that when
the cover is in position upon a wheel rim the one strip will engage or interlock
with the other as shown at Figure 1.
But the mere interlocking of the cover edges as described is not sufficient to
make the tyre secure upon the rim. Such security, however, I attain by arranging
that the stress due to inflation shall be taken primarily by the fabric itself.
and that no substantial radial or outward stress shall come upon the interlocked
edges until the air pressure within the tyre approaches the necessary intensity
to constitute what is termed a "riding pressure." The construction of the
fabric necessary to effect the desired purpose is illustrated at Figure 2. In
addition to the ordinary diagonal disposition of the crossing threads as shown,
I introduce on each side of the cover, as at B and B¹, Figures 1 and 2, a number
of threads running longitudinally or circumferentially, and by such combination
the effectual securing of the tyre is assured whilst the fabric is enabled to with-
stand the stress imposed upon it by inflation. The circumferential strips are
preferably disposed midway between the two surfaces of the fabric formed by
the diagonally disposed threads.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
-
The improved means for securing a pneumatic tyre upon a wheel rim, com-
prising the arrangement in the outer portion of the tyre or in the tyre cover of
a fabric having interlocking edges and threads disposed both diagonally and cir-
cumferentially, substantially as described and as illustrated.
Dated this lat
of Dreamban 1800
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and, 25, Cross Street, Manchester,
Agents for the Applicant.