improvements in fueumatic tyres.
Year: 1898

page_text: Date of Application, 15th Feb., 1898
1000
4000
improvements in fueumatic tyres.
We, ALBERT CULVERWELL, of 24, Daisy Road, Ladywood, Cycle Maker, and
HUBERT PRICE, of 36, George Road, Edgbaston, Manufacturer, both in Birming-
ham, in the County of Warwick, do hereby declare the nature of this invention
to be as follows:-
Our invention relates to the manufacture of pneumatic tyres and comprises
a novel construction whereby a tyre will be held on the rim without the use of
wires as in the "Dunlop" tyre or of a dove-tailed or undercut rim as in the
Clincher" tyre.
66
According to our invention the tyre cover is made, substantially, of two layers
of canvas or the like, the outer layer being simply faced with india-rubber on
the outer or tread surface, and advantageously having the edges stiffened, whilst
the inner layer is secured on the inner surface of the said outer layer along the centre
of its length and also along lines near to the edges. The width of the outer layer
between the two lines of stitching is greater than the width of the inner layer
between the said lines of stitching whereby the outer layer lies loosely against
the inner layer so that the pressure of the inflated air tube is received by the
inner layer of the cover and transmitted to the outer layer along the lines of
stitching near the edges. The canvas or fabric of the outer layer is preferably
but not of necessity cut on the bias whilst the fabric of the inner layer is prefer-
ably cut on the straight so that when the pressure acts upon the inner canvas
layer the latter exerts a pull on the edges of the outer layer along the lines of
stitching and acts upon the edge portions of the canvas of the said outer layer
in such a manner as to tend to hold the said edges against the inner surface of
the rim. The outer canvas layer is held in the form of half a circle in transverse
section by the inner canvas layer, the completion of the circle being made by the
rim; the inner canvas layer holds the edges from blowing off.
Improvements in Pneumatic Tyres.
We, ALBERT CULVERWELL, of 24, Daisy Road, Ladywood, Cycle Maker, and
HUBERT PRICE, of 36, George Road, Edgbaston, Manufacturer, both in Birming-
ham, in the County of Warwick, 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:-
Our invention relates to the manufacture of pneumatic tyres and comprises

page_text: a novel construction whereby a tyre will be held on the rim without the use of
wires as in the "Dunlop" tyre or of a dove-tailed or undercut rim as in the
Clincher" tyre.
66
In the accompanying drawing,-
Figure 1 is a transverse section of a tyre constructed according to our inven-
tion and represented as applied to a wheel rim of ordinary construction; and,
Figures 2 and 3 are views illustrating the mode of manufacturing the tyre
cover.
A tyre cover made according to our invention comprises an outer layer a of
india-rubber forming the tread portion of the tyre, a layer of canvas b of a width
slightly greater than that of the tread portion a and an inner lining c also of
canvas somewhat narrower than the canvas layer b.
In manufacturing the tyre the two canvas layers b and c are united together
along the centre of their length, for instance, by a row of stitches as at d and
then the india-rubber tread portion a is cemented to the canvas layer 6 upon the
opposite side to that upon which the canvas layer c is fixed, as will be clearly
understood by reference to Figure 2.
The edges of the canvas layer bare then brought so that they coincide with
the edges of the canvas layer c and are secured together by rows of stitches as
at e, e in Figure 3 or by cement or by both. With this arrangement the width
of fabric between the two lines of stitching e, e is greater in the layer than in
the layer c, as will be clearly understood by reference to Figure 3, whereby
when the cover is placed upon the rim, as shewn in Figure 1, and the air tube
is inflated the pressure of the said air tube upon the layer c will tend to pull the
edges of the cover towards one another instead of tending to cause the cover to
fly over the rim which would be the case if the canvas layer-c was of the same
length as the layer b and lying close against the same.
It will be understood that the difference between the widths of the two canvas
layers b and c is such that the two said layers will practically lie one against
the other when the cover is in its proper position upon the rim and the air tube
is inflated, that is to say, the spaces f, f which are shewn in Figure 1, will be
practically non existent.
In practice it is preferable, although not necessary, to cut the canvas of the
layer on the bias whilst the canvas of the layer c is cut on the straight so that
when the pressure acts upon the canvas layer c the latter exerts a pull upon the
edges of the layer bin such a manner as to tend to pull the said edges against
the rim.
C
We prefer that the edges of the cover should be stiffened more or less; this
stiffening may be accomplished by cementing or otherwise attaching to the cover,
either on the inner or outer side or between the canvas layers, strips of suitable
stiffening material, say for instance strips of stiff canvas.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what
we claim is:-
1. A pneumatic tyre the cover of which is provided with two layers of material
one of which is of greater width than the other and which are united together
at their edges and at the centre, substantially as, and for the purpose, described.
2. The manufacture and use of covers for pneumatic tyres, substantially as
herein before described and illustrated in the accompanying drawing.
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.